<?php

namespace App\Services\Finance;

use App\Models\CashAccount;
use App\Models\CashTransaction;
use App\Models\User;
use App\Services\Media\MediaService;
use App\Support\Media\MediaPresenter;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class CashService
{
    private const MAX_PHOTOS = 1;

    public function __construct(
        private readonly MediaService $mediaService,
    ) {}

    public function getDefaultAccount(): CashAccount
    {
        return CashAccount::query()->firstOrFail();
    }

    /**
     * @param  array{search: string, sort: string, direction: 'asc'|'desc'}  $tableQuery
     */
    public function paginateForIndex(CashAccount $cashAccount, array $tableQuery): LengthAwarePaginator
    {
        $query = CashTransaction::query()
            ->with(['createdBy.profile', 'reference', 'media'])
            ->where('cash_account_id', $cashAccount->id)
            ->when($tableQuery['search'] !== '', function (Builder $query) use ($tableQuery): void {
                $search = $tableQuery['search'];
                $query->where(function (Builder $query) use ($search): void {
                    $query->where('description', 'like', "%{$search}%");
                });
            });

        $this->applySorting($query, $tableQuery['sort'], $tableQuery['direction']);

        return $query
            ->paginate(10)
            ->withQueryString()
            ->through(function (CashTransaction $transaction) {
                $transaction->setAttribute(
                    'photos',
                    MediaPresenter::collection($transaction, 'photos'),
                );

                return $transaction;
            });
    }

    /**
     * @param  array{amount: int, description: string}  $validated
     */
    public function deposit(CashAccount $cashAccount, array $validated, User $user): CashTransaction
    {
        return DB::transaction(function () use ($cashAccount, $validated, $user): CashTransaction {
            $account = CashAccount::query()->lockForUpdate()->findOrFail($cashAccount->id);
            $amount = (int) $validated['amount'];
            $newBalance = $account->balance + $amount;

            $account->balance = $newBalance;
            $account->save();

            $transaction = CashTransaction::create([
                'cash_account_id' => $account->id,
                'amount' => $amount,
                'balance_after' => $newBalance,
                'description' => $validated['description'],
                'created_by_id' => $user->id,
            ]);

            $this->syncPhotos($transaction, $validated);

            return $transaction;
        });
    }

    public function recordOutgoing(
        Model $reference,
        int $amount,
        string $description,
        User $user,
        ?CashAccount $cashAccount = null,
    ): CashTransaction {
        return DB::transaction(function () use ($reference, $amount, $description, $user, $cashAccount): CashTransaction {
            $account = CashAccount::query()->lockForUpdate()->findOrFail(
                ($cashAccount ?? $this->getDefaultAccount())->id,
            );

            if ($account->balance < $amount) {
                throw ValidationException::withMessages([
                    'amount' => 'Saldo kas tidak mencukupi.',
                ]);
            }

            $newBalance = $account->balance - $amount;

            $account->balance = $newBalance;
            $account->save();

            $transaction = new CashTransaction([
                'cash_account_id' => $account->id,
                'amount' => $amount,
                'balance_after' => $newBalance,
                'description' => $description,
                'created_by_id' => $user->id,
            ]);

            $transaction->reference()->associate($reference);
            $transaction->save();

            return $transaction;
        });
    }

    public function recordIncoming(
        Model $reference,
        int $amount,
        string $description,
        User $user,
        ?CashAccount $cashAccount = null,
    ): CashTransaction {
        return DB::transaction(function () use ($reference, $amount, $description, $user, $cashAccount): CashTransaction {
            $account = CashAccount::query()->lockForUpdate()->findOrFail(
                ($cashAccount ?? $this->getDefaultAccount())->id,
            );

            $newBalance = $account->balance + $amount;

            $account->balance = $newBalance;
            $account->save();

            $transaction = new CashTransaction([
                'cash_account_id' => $account->id,
                'amount' => $amount,
                'balance_after' => $newBalance,
                'description' => $description,
                'created_by_id' => $user->id,
            ]);

            $transaction->reference()->associate($reference);
            $transaction->save();

            return $transaction;
        });
    }

    /**
     * @param  array{amount: int, description: string}  $validated
     */
    public function updateDeposit(CashTransaction $transaction, array $validated): void
    {
        $this->ensureEditable($transaction);

        DB::transaction(function () use ($transaction, $validated): void {
            CashAccount::query()->lockForUpdate()->findOrFail($transaction->cash_account_id);

            $transaction->amount = (int) $validated['amount'];
            $transaction->description = $validated['description'];
            $transaction->save();

            $this->syncPhotos($transaction, $validated);

            $this->recalculateBalances($transaction->cashAccount);
        });
    }

    public function deleteTransaction(CashTransaction $transaction): void
    {
        $this->ensureEditable($transaction);

        DB::transaction(function () use ($transaction): void {
            CashAccount::query()->lockForUpdate()->findOrFail($transaction->cash_account_id);

            $transaction->clearMediaCollection('photos');
            $transaction->delete();

            $this->recalculateBalances($transaction->cashAccount);
        });
    }

    public function updateReferencedTransaction(
        CashTransaction $transaction,
        int $amount,
        string $description,
    ): void {
        DB::transaction(function () use ($transaction, $amount, $description): void {
            CashAccount::query()->lockForUpdate()->findOrFail($transaction->cash_account_id);

            $transaction->amount = $amount;
            $transaction->description = $description;
            $transaction->save();

            $this->recalculateBalances($transaction->cashAccount);

            $account = $transaction->cashAccount->fresh();

            if ($account->balance < 0) {
                throw ValidationException::withMessages([
                    'amount' => 'Saldo kas tidak mencukupi.',
                ]);
            }
        });
    }

    public function deleteReferencedTransaction(CashTransaction $transaction): void
    {
        DB::transaction(function () use ($transaction): void {
            CashAccount::query()->lockForUpdate()->findOrFail($transaction->cash_account_id);
            $account = $transaction->cashAccount;

            $transaction->delete();

            $this->recalculateBalances($account);
        });
    }

    /**
     * @param  array<string, mixed>  $validated
     */
    private function syncPhotos(CashTransaction $transaction, array $validated): void
    {
        $this->mediaService->syncCollection(
            $transaction,
            'photos',
            $validated['photos'] ?? null,
            $validated['remove_media_ids'] ?? null,
            self::MAX_PHOTOS,
            required: true,
            errorKey: 'photos',
        );
    }

    private function ensureEditable(CashTransaction $transaction): void
    {
        if ($transaction->reference_type !== null) {
            throw ValidationException::withMessages([
                'transaction' => 'Transaksi ini tidak dapat diubah dari halaman kas.',
            ]);
        }
    }

    private function recalculateBalances(CashAccount $cashAccount): void
    {
        $account = CashAccount::query()->lockForUpdate()->findOrFail($cashAccount->id);
        $runningBalance = 0;

        $transactions = CashTransaction::query()
            ->with('reference')
            ->where('cash_account_id', $account->id)
            ->orderBy('created_at')
            ->orderBy('id')
            ->get();

        foreach ($transactions as $transaction) {
            if (CashTransaction::isIncomingTransaction($transaction)) {
                $runningBalance += $transaction->amount;
            } else {
                $runningBalance -= $transaction->amount;
            }

            $transaction->balance_after = $runningBalance;
            $transaction->saveQuietly();
        }

        $account->balance = $runningBalance;
        $account->save();
    }

    private function applySorting(Builder $query, string $sort, string $direction): void
    {
        if (in_array($sort, ['created_at', 'amount', 'reference_type'], true)) {
            $query->orderBy($sort, $direction);

            return;
        }

        $query->latest();
    }
}