import supabase from "../config/supabaseClient.js";

// Get all inventory logs
export const getInventoryLogs = async (req, res) => {
    try {
        const { product_id } = req.query;
        let query = supabase
            .from('inventory_logs')
            .select(`*, products(name), users(full_name)`)
            .order('log_date', { ascending: false });

        if (product_id) query = query.eq('product_id', product_id);

        const { data, error } = await query;

        if (error) throw error;

        res.json(data);
    } catch (error) {
        console.error("Error fetching inventory logs:", error);
        res.status(500).json({ error: "Failed to fetch inventory logs" });
    }
};

// Add a log (add, remove, adjust, sale)
export const createInventoryLog = async (req, res) => {
    const { product_id, user_id, action, quantity, remarks } = req.body;

    if (!product_id || !user_id || !action || !quantity) {
        return res.status(400).json({ error: "Missing required fields" });
    }

    try {
        // Insert log
        const { data: log, error } = await supabase
            .from('inventory_logs')
            .insert([{ product_id, user_id, action, quantity, remarks }])
            .select()
            .single();

        if (error) throw error;

        // Update product stock
        // Add/subtract quantity depending on action
        const { data: product, error: fetchError } = await supabase
            .from('products')
            .select('stock')
            .eq('product_id', product_id)
            .single();
        if (fetchError) throw fetchError;

        let newStock = product.stock;
        if (action === "add" || action === "adjust") newStock += quantity;
        else if (action === "remove" || action === "sale") newStock -= quantity;

        const { error: updateError } = await supabase
            .from('products')
            .update({ stock: newStock })
            .eq('product_id', product_id);

        if (updateError) throw updateError;

        res.status(201).json(log);
    } catch (error) {
        console.error("Error creating inventory log:", error);
        res.status(500).json({ error: "Failed to create inventory log" });
    }
};