-- Configuration tables schema

-- Stock threshold configurations
CREATE TABLE IF NOT EXISTS stock_thresholds (
    id INT NOT NULL,
    category_id BIGINT,  -- NULL means default/global threshold
    vendor VARCHAR(100), -- NULL means applies to all vendors
    critical_days INT NOT NULL DEFAULT 7,
    reorder_days INT NOT NULL DEFAULT 14,
    overstock_days INT NOT NULL DEFAULT 90,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    FOREIGN KEY (category_id) REFERENCES categories(id) ON DELETE CASCADE,
    UNIQUE KEY unique_category_vendor (category_id, vendor)
);

-- Insert default thresholds with ID=1 if not exists
INSERT INTO stock_thresholds (id, category_id, vendor, critical_days, reorder_days, overstock_days)
VALUES (1, NULL, NULL, 7, 14, 90)
ON DUPLICATE KEY UPDATE
    critical_days = VALUES(critical_days),
    reorder_days = VALUES(reorder_days),
    overstock_days = VALUES(overstock_days);

-- View to show thresholds with category names
CREATE OR REPLACE VIEW stock_thresholds_view AS
SELECT 
    st.*,
    c.name as category_name,
    CASE 
        WHEN st.category_id IS NULL AND st.vendor IS NULL THEN 'Global Default'
        WHEN st.category_id IS NULL THEN CONCAT('Vendor: ', st.vendor)
        WHEN st.vendor IS NULL THEN CONCAT('Category: ', c.name)
        ELSE CONCAT('Category: ', c.name, ' / Vendor: ', st.vendor)
    END as threshold_scope
FROM 
    stock_thresholds st
LEFT JOIN 
    categories c ON st.category_id = c.id
ORDER BY 
    CASE 
        WHEN st.category_id IS NULL AND st.vendor IS NULL THEN 1
        WHEN st.category_id IS NULL THEN 2
        WHEN st.vendor IS NULL THEN 3
        ELSE 4
    END,
    c.name,
    st.vendor;