const { outputProgress, formatElapsedTime, estimateRemaining, calculateRate, logError } = require('./utils/progress');
const { getConnection } = require('./utils/db');

async function calculateTimeAggregates(startTime, totalProducts, processedCount = 0, isCancelled = false) {
    const connection = await getConnection();
    let success = false;
    let processedOrders = 0;
    
    try {
        if (isCancelled) {
            outputProgress({
                status: 'cancelled',
                operation: 'Time aggregates calculation cancelled',
                current: processedCount,
                total: totalProducts,
                elapsed: formatElapsedTime(startTime),
                remaining: null,
                rate: calculateRate(startTime, processedCount),
                percentage: ((processedCount / totalProducts) * 100).toFixed(1),
                timing: {
                    start_time: new Date(startTime).toISOString(),
                    end_time: new Date().toISOString(),
                    elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
                }
            });
            return {
                processedProducts: processedCount,
                processedOrders: 0,
                processedPurchaseOrders: 0,
                success
            };
        }

        // Get order count that will be processed
        const orderCount = await connection.query(`
            SELECT COUNT(*) as count 
            FROM orders o 
            WHERE o.canceled = false
        `);
        processedOrders = parseInt(orderCount.rows[0].count);

        outputProgress({
            status: 'running',
            operation: 'Starting time aggregates calculation',
            current: processedCount,
            total: totalProducts,
            elapsed: formatElapsedTime(startTime),
            remaining: estimateRemaining(startTime, processedCount, totalProducts),
            rate: calculateRate(startTime, processedCount),
            percentage: ((processedCount / totalProducts) * 100).toFixed(1),
            timing: {
                start_time: new Date(startTime).toISOString(),
                end_time: new Date().toISOString(),
                elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
            }
        });

        // Initial insert of time-based aggregates
        await connection.query(`
            INSERT INTO product_time_aggregates (
                pid,
                year,
                month,
                total_quantity_sold,
                total_revenue,
                total_cost,
                order_count,
                stock_received,
                stock_ordered,
                avg_price,
                profit_margin,
                inventory_value,
                gmroi
            )
            WITH monthly_sales AS (
                SELECT 
                    o.pid,
                    EXTRACT(YEAR FROM o.date) as year,
                    EXTRACT(MONTH FROM o.date) as month,
                    SUM(o.quantity) as total_quantity_sold,
                    SUM((o.price - COALESCE(o.discount, 0)) * o.quantity) as total_revenue,
                    SUM(COALESCE(p.cost_price, 0) * o.quantity) as total_cost,
                    COUNT(DISTINCT o.order_number) as order_count,
                    AVG(o.price - COALESCE(o.discount, 0)) as avg_price,
                    CASE 
                        WHEN SUM((o.price - COALESCE(o.discount, 0)) * o.quantity) > 0 
                        THEN ((SUM((o.price - COALESCE(o.discount, 0)) * o.quantity) - SUM(COALESCE(p.cost_price, 0) * o.quantity)) 
                            / SUM((o.price - COALESCE(o.discount, 0)) * o.quantity)) * 100
                        ELSE 0 
                    END as profit_margin,
                    p.cost_price * p.stock_quantity as inventory_value,
                    COUNT(DISTINCT DATE(o.date)) as active_days
                FROM orders o
                JOIN products p ON o.pid = p.pid
                WHERE o.canceled = false
                GROUP BY o.pid, EXTRACT(YEAR FROM o.date), EXTRACT(MONTH FROM o.date), p.cost_price, p.stock_quantity
            ),
            monthly_stock AS (
                SELECT 
                    pid,
                    EXTRACT(YEAR FROM date) as year,
                    EXTRACT(MONTH FROM date) as month,
                    SUM(received) as stock_received,
                    SUM(ordered) as stock_ordered
                FROM purchase_orders
                GROUP BY pid, EXTRACT(YEAR FROM date), EXTRACT(MONTH FROM date)
            ),
            base_products AS (
                SELECT 
                    p.pid,
                    p.cost_price * p.stock_quantity as inventory_value
                FROM products p
            )
            SELECT 
                COALESCE(s.pid, ms.pid) as pid,
                COALESCE(s.year, ms.year) as year,
                COALESCE(s.month, ms.month) as month,
                COALESCE(s.total_quantity_sold, 0) as total_quantity_sold,
                COALESCE(s.total_revenue, 0) as total_revenue,
                COALESCE(s.total_cost, 0) as total_cost,
                COALESCE(s.order_count, 0) as order_count,
                COALESCE(ms.stock_received, 0) as stock_received,
                COALESCE(ms.stock_ordered, 0) as stock_ordered,
                COALESCE(s.avg_price, 0) as avg_price,
                COALESCE(s.profit_margin, 0) as profit_margin,
                COALESCE(s.inventory_value, bp.inventory_value, 0) as inventory_value,
                CASE 
                    WHEN COALESCE(s.inventory_value, bp.inventory_value, 0) > 0 
                        AND COALESCE(s.active_days, 0) > 0 
                    THEN (COALESCE(s.total_revenue - s.total_cost, 0) * (365.0 / s.active_days)) 
                        / COALESCE(s.inventory_value, bp.inventory_value)
                    ELSE 0 
                END as gmroi
            FROM (
                SELECT * FROM monthly_sales s
                UNION ALL
                SELECT 
                    ms.pid,
                    ms.year,
                    ms.month,
                    0 as total_quantity_sold,
                    0 as total_revenue,
                    0 as total_cost,
                    0 as order_count,
                    NULL as avg_price,
                    0 as profit_margin,
                    NULL as inventory_value,
                    0 as active_days
                FROM monthly_stock ms
                WHERE NOT EXISTS (
                    SELECT 1 FROM monthly_sales s2
                    WHERE s2.pid = ms.pid
                    AND s2.year = ms.year
                    AND s2.month = ms.month
                )
            ) s
            LEFT JOIN monthly_stock ms 
                ON s.pid = ms.pid 
                AND s.year = ms.year 
                AND s.month = ms.month
            JOIN base_products bp ON COALESCE(s.pid, ms.pid) = bp.pid
            UNION
            SELECT 
                ms.pid,
                ms.year,
                ms.month,
                0 as total_quantity_sold,
                0 as total_revenue,
                0 as total_cost,
                0 as order_count,
                ms.stock_received,
                ms.stock_ordered,
                0 as avg_price,
                0 as profit_margin,
                bp.inventory_value,
                0 as gmroi
            FROM monthly_stock ms
            JOIN base_products bp ON ms.pid = bp.pid
            WHERE NOT EXISTS (
                SELECT 1 FROM (
                    SELECT * FROM monthly_sales
                    UNION ALL
                    SELECT 
                        ms2.pid,
                        ms2.year,
                        ms2.month,
                        0, 0, 0, 0, NULL, 0, NULL, 0
                    FROM monthly_stock ms2
                    WHERE NOT EXISTS (
                        SELECT 1 FROM monthly_sales s2
                        WHERE s2.pid = ms2.pid
                        AND s2.year = ms2.year
                        AND s2.month = ms2.month
                    )
                ) s
                WHERE s.pid = ms.pid
                AND s.year = ms.year
                AND s.month = ms.month
            )
            ON CONFLICT (pid, year, month) DO UPDATE
            SET
                total_quantity_sold = EXCLUDED.total_quantity_sold,
                total_revenue = EXCLUDED.total_revenue,
                total_cost = EXCLUDED.total_cost,
                order_count = EXCLUDED.order_count,
                stock_received = EXCLUDED.stock_received,
                stock_ordered = EXCLUDED.stock_ordered,
                avg_price = EXCLUDED.avg_price,
                profit_margin = EXCLUDED.profit_margin,
                inventory_value = EXCLUDED.inventory_value,
                gmroi = EXCLUDED.gmroi
        `);

        processedCount = Math.floor(totalProducts * 0.60);
        outputProgress({
            status: 'running',
            operation: 'Base time aggregates calculated, updating financial metrics',
            current: processedCount,
            total: totalProducts,
            elapsed: formatElapsedTime(startTime),
            remaining: estimateRemaining(startTime, processedCount, totalProducts),
            rate: calculateRate(startTime, processedCount),
            percentage: ((processedCount / totalProducts) * 100).toFixed(1),
            timing: {
                start_time: new Date(startTime).toISOString(),
                end_time: new Date().toISOString(),
                elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
            }
        });

        if (isCancelled) return {
            processedProducts: processedCount,
            processedOrders,
            processedPurchaseOrders: 0,
            success
        };

        // Update with financial metrics
        await connection.query(`
            UPDATE product_time_aggregates pta
            SET inventory_value = COALESCE(fin.inventory_value, 0)
            FROM (
                SELECT 
                    p.pid,
                    EXTRACT(YEAR FROM o.date) as year,
                    EXTRACT(MONTH FROM o.date) as month,
                    p.cost_price * p.stock_quantity as inventory_value,
                    SUM(o.quantity * (o.price - p.cost_price)) as gross_profit,
                    COUNT(DISTINCT DATE(o.date)) as active_days
                FROM products p
                LEFT JOIN orders o ON p.pid = o.pid
                WHERE o.canceled = false
                GROUP BY p.pid, EXTRACT(YEAR FROM o.date), EXTRACT(MONTH FROM o.date), p.cost_price, p.stock_quantity
            ) fin
            WHERE pta.pid = fin.pid 
                AND pta.year = fin.year 
                AND pta.month = fin.month
        `);

        processedCount = Math.floor(totalProducts * 0.65);
        outputProgress({
            status: 'running',
            operation: 'Financial metrics updated',
            current: processedCount,
            total: totalProducts,
            elapsed: formatElapsedTime(startTime),
            remaining: estimateRemaining(startTime, processedCount, totalProducts),
            rate: calculateRate(startTime, processedCount),
            percentage: ((processedCount / totalProducts) * 100).toFixed(1),
            timing: {
                start_time: new Date(startTime).toISOString(),
                end_time: new Date().toISOString(),
                elapsed_seconds: Math.round((Date.now() - startTime) / 1000)
            }
        });

        // If we get here, everything completed successfully
        success = true;
        
        // Update calculate_status
        await connection.query(`
            INSERT INTO calculate_status (module_name, last_calculation_timestamp)
            VALUES ('time_aggregates', NOW())
            ON CONFLICT (module_name) DO UPDATE
            SET last_calculation_timestamp = NOW()
        `);

        return {
            processedProducts: processedCount,
            processedOrders,
            processedPurchaseOrders: 0,
            success
        };

    } catch (error) {
        success = false;
        logError(error, 'Error calculating time aggregates');
        throw error;
    } finally {
        if (connection) {
            connection.release();
        }
    }
}

module.exports = calculateTimeAggregates;