const DRAFT_PREFIX = 'raw-material-draft';

export type RawMaterialDraftData = {
    name: string;
    unit: string;
    isActive: boolean;
    variants: Array<{
        id?: number | null;
        variant: string;
        price: number;
        stock: number;
        photo?: string;
    }>;
};

function getKey(
    type: 'create' | 'edit',
    userId?: number,
    rawMaterialId?: number,
): string {
    if (type === 'edit' && rawMaterialId) {
        return `${DRAFT_PREFIX}-edit-${userId ?? 'anon'}-${rawMaterialId}`;
    }

    return `${DRAFT_PREFIX}-create-${userId ?? 'anon'}`;
}

export function saveRawMaterialDraft(
    type: 'create' | 'edit',
    data: RawMaterialDraftData,
    userId?: number,
    rawMaterialId?: number,
): boolean {
    if (type !== 'create') {
        return false;
    }

    try {
        const key = getKey(type, userId, rawMaterialId);
        localStorage.setItem(key, JSON.stringify(data));

        return true;
    } catch {
        return false;
    }
}

export function loadRawMaterialDraft(
    type: 'create' | 'edit',
    userId?: number,
    rawMaterialId?: number,
): RawMaterialDraftData | null {
    try {
        const key = getKey(type, userId, rawMaterialId);
        const raw = localStorage.getItem(key);

        if (!raw) {
            return null;
        }

        return JSON.parse(raw) as RawMaterialDraftData;
    } catch {
        return null;
    }
}

export function clearRawMaterialDraft(
    type: 'create' | 'edit',
    userId?: number,
    rawMaterialId?: number,
): void {
    try {
        const key = getKey(type, userId, rawMaterialId);
        localStorage.removeItem(key);
    } catch {
        // ignore
    }
}