'use no memo';

import { Form, Head, Link } from '@inertiajs/react';
import {
    ArrowLeft,
    Minus,
    Plus,
    ShoppingCart,
    Trash2,
} from 'lucide-react';
import { useCallback, useMemo, useState } from 'react';
import { toast } from 'sonner';
import { ConfirmDialog } from '@/components/dialogs';
import { FileUpload } from '@/components/inputs';
import { ImagePreviewModal } from '@/components/dialogs';
import { InputError } from '@/components/ui';
import { NumberInput } from '@/components/inputs';
import { RupiahInput } from '@/components/inputs';
import { Button } from '@/components/ui/button';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import {
    Combobox,
    ComboboxContent,
    ComboboxEmpty,
    ComboboxInput,
    ComboboxItem,
    ComboboxList,
} from '@/components/ui/combobox';
import { Label } from '@/components/ui/label';
import {
    Sheet,
    SheetContent,
    SheetFooter,
    SheetHeader,
    SheetTitle,
} from '@/components/ui/sheet';
import { Textarea } from '@/components/ui/textarea';
import { formatNumber } from '@/lib/format';
import { formatCurrency } from '@/lib/utils';
import {
    index as purchaseIndex,
    update,
} from '@/routes/admin/manage/purchases';
import type { PurchaseCreateData, PurchaseForEdit } from './columns';

type CartLine = {
    key: string;
    photoUrl: string | null;
    title: string;
    subtitle: string;
    price: number;
    quantity: number;
    onAdjust: (delta: number) => void;
    onSet: (value: number) => void;
    onRemove: () => void;
};

type Props = {
    purchase: PurchaseForEdit;
    suppliers: PurchaseCreateData['suppliers'];
    rawMaterials: PurchaseCreateData['rawMaterials'];
};

export default function PurchaseEdit({
    purchase,
    suppliers,
    rawMaterials,
}: Props) {

    const [supplierId, setSupplierId] = useState(String(purchase.supplier_id));
    const selectedSupplier =
        suppliers.find((s) => String(s.id) === supplierId) ?? null;
    const [discount, setDiscount] = useState(purchase.discount);
    const [shippingCost, setShippingCost] = useState(purchase.shipping_cost);
    const [notes, setNotes] = useState(purchase.notes ?? '');
    const [photo, setPhoto] = useState<string | null>(purchase.photo_key);
    const [photoUrl, setPhotoUrl] = useState<string | null>(purchase.photo_url);
    const [uploading, setUploading] = useState(false);

    const [selectedMaterialName, setSelectedMaterialName] = useState(
        purchase.existing_material_name ?? '',
    );
    const [quantities, setQuantities] = useState<Record<number, number>>(() =>
        Object.fromEntries(
            Object.entries(purchase.existing_quantities).map(([id, qty]) => [
                Number(id),
                qty,
            ]),
        ),
    );
    const [cartOpen, setCartOpen] = useState(false);
    const [previewKey, setPreviewKey] = useState<string | null>(null);
    const [cartRemoveKey, setCartRemoveKey] = useState<string | null>(null);

    const priceMap = useMemo(
        () =>
            new Map(
                rawMaterials.flatMap((m) =>
                    m.raw_material_prices.map((p) => [p.id, p]),
                ),
            ),
        [rawMaterials],
    );

    const materialByPriceId = useMemo(
        () =>
            new Map(
                rawMaterials.flatMap((m) =>
                    m.raw_material_prices.map((p) => [
                        p.id,
                        { name: m.name, unit: m.unit },
                    ]),
                ),
            ),
        [rawMaterials],
    );

    const subtotal = Object.entries(quantities).reduce(
        (sum, [priceId, quantity]) => {
            const price = priceMap.get(Number(priceId));

            return sum + (price ? price.price * quantity : 0);
        },
        0,
    );
    const total = subtotal - discount + shippingCost;

    const selectedMaterial = useMemo(
        () => rawMaterials.find((m) => m.name === selectedMaterialName) ?? null,
        [rawMaterials, selectedMaterialName],
    );

    const updateQuantity = useCallback((priceId: number, value: number) => {
        setQuantities((prev) => ({
            ...prev,
            [priceId]: Math.max(0, value),
        }));
    }, []);

    const incrementQuantity = useCallback((priceId: number, amount: number) => {
        setQuantities((prev) => ({
            ...prev,
            [priceId]: Math.max(0, (prev[priceId] ?? 0) + amount),
        }));
    }, []);

    const cartItems: CartLine[] = (() => {
        const lines: CartLine[] = [];

        for (const [priceId, quantity] of Object.entries(quantities)) {
            if (quantity <= 0) {
                continue;
            }

            const id = Number(priceId);
            const price = priceMap.get(id);
            const material = materialByPriceId.get(id);

            if (price && material) {
                lines.push({
                    key: `existing-${id}`,
                    photoUrl: price.photo_url,
                    title: `${material.name} — ${price.variant}`,
                    subtitle: `${formatCurrency(price.price)} / ${material.unit}`,
                    price: price.price,
                    quantity,
                    onAdjust: (delta) => incrementQuantity(id, delta),
                    onSet: (value) => updateQuantity(id, value),
                    onRemove: () => updateQuantity(id, 0),
                });
            }
        }

        return lines.sort((a, b) => a.title.localeCompare(b.title));
    })();

    function formatQuantity(value: number): string {
        return formatNumber(value, { maximumFractionDigits: 4 });
    }

    function getPayload() {
        return {
            mode: 'existing',
            supplier_id: supplierId ? Number(supplierId) : null,
            discount,
            shipping_cost: shippingCost,
            notes: notes || null,
            photo_key: photo,
            existing_items: Object.entries(quantities)
                .map(([priceId, quantity]) => ({
                    raw_material_price_id: Number(priceId),
                    quantity: Number(quantity),
                    unit_price: priceMap.get(Number(priceId))?.price ?? 0,
                }))
                .filter((item) => item.quantity > 0),
        };
    }

    return (
        <>
            <Head title="Edit Belanja" />

            <div className="flex h-full flex-1 flex-col gap-6 overflow-x-auto p-4 md:p-6">
                <div className="flex items-center justify-between">
                    <h2 className="text-2xl font-semibold tracking-tight">
                        Edit Belanja
                    </h2>
                    <Button asChild variant="outline">
                        <Link href={purchaseIndex.url()}>
                            <ArrowLeft className="h-4 w-4" />
                            Kembali
                        </Link>
                    </Button>
                </div>

                <Form
                    action={update(purchase.id)}
                    method="put"
                    transform={(data) => ({
                        ...data,
                        ...getPayload(),
                    })}
                    onError={() => {
                        toast.error('Ada data yang belum sesuai, silakan periksa kembali input Anda.');
                    }}
                >
                    {({ errors, processing }) => (
                        <div className="grid gap-6 md:grid-cols-3">
                            <div className="space-y-6 md:col-span-2">
                                <Card>
                                    <CardHeader>
                                        <CardTitle>
                                            Pilih Bahan Baku
                                        </CardTitle>
                                    </CardHeader>
                                    <CardContent className="space-y-4">
                                        <div className="grid gap-2">
                                            <Label>
                                                Nama Bahan Baku{' '}
                                                <span className="text-destructive">
                                                    *
                                                </span>
                                            </Label>
                                            <Combobox
                                                items={rawMaterials}
                                                itemToStringLabel={(
                                                    m,
                                                ) => m.name}
                                                value={selectedMaterial}
                                                onValueChange={(
                                                    value,
                                                ) =>
                                                    setSelectedMaterialName(
                                                        value?.name ??
                                                            '',
                                                    )
                                                }
                                            >
                                                <ComboboxInput
                                                    placeholder="Cari bahan baku..."
                                                    className="w-full"
                                                    disabled
                                                />
                                                <ComboboxContent>
                                                    <ComboboxEmpty>
                                                        Tidak ada bahan
                                                        baku ditemukan.
                                                    </ComboboxEmpty>
                                                    <ComboboxList>
                                                        {(m) => (
                                                            <ComboboxItem
                                                                key={
                                                                    m.id
                                                                }
                                                                value={
                                                                    m
                                                                }
                                                            >
                                                                {m.name}{' '}
                                                                (
                                                                {m.unit}
                                                                )
                                                            </ComboboxItem>
                                                        )}
                                                    </ComboboxList>
                                                </ComboboxContent>
                                            </Combobox>
                                            <InputError
                                                message={
                                                    errors.existing_items
                                                }
                                            />
                                        </div>

                                        {selectedMaterial && (
                                            <div className="space-y-2">
                                                {selectedMaterial.raw_material_prices.map(
                                                    (price) => (
                                                        <div
                                                            key={
                                                                price.id
                                                            }
                                                            className={
                                                                (quantities[
                                                                    price
                                                                        .id
                                                                ] ??
                                                                    0) >
                                                                    0
                                                                    ? 'flex items-center justify-between gap-3 rounded-lg border border-primary p-3'
                                                                    : 'flex items-center justify-between gap-3 rounded-lg border p-3'
                                                            }
                                                        >
                                                            <div className="flex min-w-0 items-center gap-3">
                                                                {price.photo_url ? (
                                                                    <img
                                                                        src={
                                                                            price.photo_url
                                                                        }
                                                                        alt={
                                                                            price.variant
                                                                        }
                                                                        className="h-10 w-10 shrink-0 rounded-md object-cover"
                                                                    />
                                                                ) : (
                                                                    <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-md bg-muted text-xs text-muted-foreground">
                                                                        N/A
                                                                    </div>
                                                                )}
                                                                <div className="min-w-0">
                                                                    <p className="truncate font-medium">
                                                                        {
                                                                            price.variant
                                                                        }
                                                                    </p>
                                                                    <p className="text-xs text-muted-foreground">
                                                                        Stok:{' '}
                                                                        {formatQuantity(
                                                                            Number(
                                                                                price.stock,
                                                                            ),
                                                                        )}{' '}
                                                                        {
                                                                            selectedMaterial.unit
                                                                        }{' '}
                                                                        ·{' '}
                                                                        {formatCurrency(
                                                                            price.price,
                                                                        )}
                                                                    </p>
                                                                </div>
                                                            </div>
                                                            <div className="flex shrink-0 items-center gap-2">
                                                                <Button
                                                                    type="button"
                                                                    variant="outline"
                                                                    size="icon"
                                                                    disabled={
                                                                        !(
                                                                            quantities[
                                                                            price
                                                                                .id
                                                                            ] ??
                                                                            0
                                                                        )
                                                                    }
                                                                    onClick={() =>
                                                                        incrementQuantity(
                                                                            price.id,
                                                                            -1,
                                                                        )
                                                                    }
                                                                >
                                                                    <Minus className="h-4 w-4" />
                                                                </Button>
                                                                <NumberInput
                                                                    className="w-24 text-center"
                                                                    value={
                                                                        quantities[
                                                                        price
                                                                            .id
                                                                        ] ??
                                                                        0
                                                                    }
                                                                    onValueChange={(
                                                                        val,
                                                                    ) =>
                                                                        updateQuantity(
                                                                            price.id,
                                                                            val,
                                                                        )
                                                                    }
                                                                />
                                                                <Button
                                                                    type="button"
                                                                    variant="outline"
                                                                    size="icon"
                                                                    onClick={() =>
                                                                        incrementQuantity(
                                                                            price.id,
                                                                            1,
                                                                        )
                                                                    }
                                                                >
                                                                    <Plus className="h-4 w-4" />
                                                                </Button>
                                                            </div>
                                                        </div>
                                                    ),
                                                )}
                                            </div>
                                        )}
                                    </CardContent>
                                </Card>
                            </div>

                            <div className="space-y-6 md:col-span-1">
                                <Card className="sticky top-6">
                                    <CardHeader>
                                        <CardTitle>Ringkasan</CardTitle>
                                    </CardHeader>
                                    <CardContent className="space-y-4">
                                        <div className="grid gap-2">
                                            <Label>
                                                Supplier{' '}
                                                <span className="text-destructive">
                                                    *
                                                </span>
                                            </Label>
                                            <Combobox
                                                items={suppliers}
                                                itemToStringLabel={(s) =>
                                                    s.name
                                                }
                                                value={selectedSupplier}
                                                onValueChange={(value) =>
                                                    setSupplierId(
                                                        value
                                                            ? String(value.id)
                                                            : '',
                                                    )
                                                }
                                            >
                                                <ComboboxInput
                                                    placeholder="Cari supplier..."
                                                    className="w-full"
                                                />
                                                <ComboboxContent>
                                                    <ComboboxEmpty>
                                                        Tidak ada supplier
                                                        ditemukan.
                                                    </ComboboxEmpty>
                                                    <ComboboxList>
                                                        {(s) => (
                                                            <ComboboxItem
                                                                key={s.id}
                                                                value={s}
                                                            >
                                                                {s.name}
                                                            </ComboboxItem>
                                                        )}
                                                    </ComboboxList>
                                                </ComboboxContent>
                                            </Combobox>
                                            <InputError
                                                message={errors.supplier_id}
                                            />
                                        </div>

                                        <div className="space-y-2">
                                            <div className="flex items-center justify-between text-sm">
                                                <span className="text-muted-foreground">
                                                    Subtotal
                                                </span>
                                                <span className="font-medium">
                                                    {formatCurrency(subtotal)}
                                                </span>
                                            </div>
                                            <div className="flex items-center justify-between text-sm">
                                                <span className="text-muted-foreground">
                                                    Diskon
                                                </span>
                                                <div className="w-36">
                                                    <RupiahInput
                                                        value={discount}
                                                        onValueChange={
                                                            setDiscount
                                                        }
                                                    />
                                                </div>
                                            </div>
                                            <InputError
                                                message={errors.discount}
                                            />
                                            <div className="flex items-center justify-between text-sm">
                                                <span className="text-muted-foreground">
                                                    Ongkir
                                                </span>
                                                <div className="w-36">
                                                    <RupiahInput
                                                        value={shippingCost}
                                                        onValueChange={
                                                            setShippingCost
                                                        }
                                                    />
                                                </div>
                                            </div>
                                            <InputError
                                                message={errors.shipping_cost}
                                            />
                                            <div className="border-t pt-2">
                                                <div className="flex items-center justify-between text-sm font-semibold">
                                                    <span>Total</span>
                                                    <span>
                                                        {formatCurrency(total)}
                                                    </span>
                                                </div>
                                            </div>
                                        </div>

                                        <div className="grid gap-2">
                                            <Label htmlFor="edit-notes">
                                                Keterangan
                                            </Label>
                                            <Textarea
                                                id="edit-notes"
                                                value={notes}
                                                onChange={(e) =>
                                                    setNotes(e.target.value)
                                                }
                                                placeholder="Masukkan keterangan"
                                                maxLength={100}
                                            />
                                            <InputError
                                                message={errors.notes}
                                            />
                                        </div>

                                        <div className="grid gap-2">
                                            <Label>Foto</Label>
                                            <FileUpload
                                                value={photo}
                                                onChange={(key) => {
                                                    setPhoto(key);
                                                    const url = key
                                                        ? `https://dstpabuaran.s3.ap-southeast-1.amazonaws.com/${key}`
                                                        : null;
                                                    setPhotoUrl(url);
                                                }}
                                                folder="purchase"
                                                existingUrl={photoUrl}
                                                onUploadingChange={setUploading}
                                            />
                                            <InputError
                                                message={errors.photo_key}
                                            />
                                        </div>

                                        <Button
                                            type="submit"
                                            className="w-full"
                                            disabled={
                                                processing ||
                                                uploading ||
                                                !supplierId ||
                                                Object.values(
                                                    quantities,
                                                ).every((q) => q <= 0)
                                            }
                                        >
                                            {processing
                                                ? 'Menyimpan...'
                                                : 'Simpan'}
                                        </Button>
                                    </CardContent>
                                </Card>
                            </div>
                        </div>
                    )}
                </Form>

                <Button
                    type="button"
                    onClick={() => setCartOpen(true)}
                    className="fixed top-1/2 right-4 z-50 h-14 w-14 -translate-y-1/2 rounded-full shadow-lg"
                    size="icon"
                    aria-label="Buka keranjang belanja"
                >
                    <ShoppingCart className="h-5 w-5" />
                    {cartItems.length > 0 && (
                        <span className="absolute -top-1 -right-1 flex h-5 min-w-5 items-center justify-center rounded-full bg-destructive px-1 text-xs font-semibold text-white">
                            {cartItems.length}
                        </span>
                    )}
                </Button>

                <Sheet open={cartOpen} onOpenChange={setCartOpen}>
                    <SheetContent side="right" className="w-full sm:max-w-md">
                        <SheetHeader>
                            <SheetTitle>Keranjang Belanja</SheetTitle>
                        </SheetHeader>

                        <div className="flex-1 space-y-3 overflow-y-auto px-6 pb-6">
                            {cartItems.length === 0 ? (
                                <p className="text-sm text-muted-foreground">
                                    Keranjang kosong.
                                </p>
                            ) : (
                                cartItems.map((item) => (
                                    <div
                                        key={item.key}
                                        className="space-y-3 rounded-lg border p-3"
                                    >
                                        <div className="flex items-start justify-between gap-2">
                                            <div className="flex items-center gap-3">
                                                {item.photoUrl ? (
                                                    <button
                                                        type="button"
                                                        onClick={() =>
                                                            setPreviewKey(
                                                                item.key,
                                                            )
                                                        }
                                                        className="block h-10 w-10 shrink-0 overflow-hidden rounded-md border transition-opacity hover:opacity-80"
                                                    >
                                                        <img
                                                            src={item.photoUrl}
                                                            alt={item.title}
                                                            className="h-full w-full object-cover"
                                                        />
                                                    </button>
                                                ) : (
                                                    <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-md bg-muted text-xs text-muted-foreground">
                                                        N/A
                                                    </div>
                                                )}
                                                <div>
                                                    <p className="font-medium">
                                                        {item.title}
                                                    </p>
                                                    <p className="text-xs text-muted-foreground">
                                                        {item.subtitle}
                                                    </p>
                                                </div>
                                            </div>
                                            <Button
                                                type="button"
                                                variant="ghost"
                                                size="icon-sm"
                                                onClick={() =>
                                                    setCartRemoveKey(item.key)
                                                }
                                            >
                                                <Trash2 className="h-4 w-4 text-destructive" />
                                            </Button>
                                        </div>
                                        <div className="flex items-center justify-between">
                                            <div className="flex items-center gap-2">
                                                <Button
                                                    type="button"
                                                    variant="outline"
                                                    size="icon-sm"
                                                    disabled={
                                                        item.quantity <= 0
                                                    }
                                                    onClick={() =>
                                                        item.onAdjust(-1)
                                                    }
                                                >
                                                    <Minus className="h-4 w-4" />
                                                </Button>
                                                <NumberInput
                                                    className="w-20 text-center"
                                                    value={item.quantity}
                                                    onValueChange={item.onSet}
                                                />
                                                <Button
                                                    type="button"
                                                    variant="outline"
                                                    size="icon-sm"
                                                    onClick={() =>
                                                        item.onAdjust(1)
                                                    }
                                                >
                                                    <Plus className="h-4 w-4" />
                                                </Button>
                                            </div>
                                            <span className="font-medium">
                                                {formatCurrency(
                                                    item.price * item.quantity,
                                                )}
                                            </span>
                                        </div>
                                    </div>
                                ))
                            )}
                        </div>

                        <SheetFooter>
                            <div className="flex items-center justify-between border-t pt-4">
                                <span className="text-sm">Subtotal</span>
                                <span className="text-sm font-semibold">
                                    {formatCurrency(subtotal)}
                                </span>
                            </div>
                        </SheetFooter>
                    </SheetContent>
                </Sheet>

                <ImagePreviewModal
                    open={previewKey !== null}
                    onOpenChange={(open) => {
                        if (!open) {
                            setPreviewKey(null);
                        }
                    }}
                    src={
                        cartItems.find((i) => i.key === previewKey)?.photoUrl ??
                        null
                    }
                    title={cartItems.find((i) => i.key === previewKey)?.title}
                />

                <ConfirmDialog
                    open={cartRemoveKey !== null}
                    onOpenChange={(open) => {
                        if (!open) {
                            setCartRemoveKey(null);
                        }
                    }}
                    title="Hapus Item Keranjang"
                    description="Apakah Anda yakin ingin menghapus item ini dari keranjang?"
                    confirmLabel="Hapus"
                    variant="destructive"
                    onConfirm={() => {
                        cartItems
                            .find((i) => i.key === cartRemoveKey)
                            ?.onRemove();
                        setCartRemoveKey(null);
                    }}
                />
            </div>
        </>
    );
}
