-- 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,
    low_stock_threshold INT NOT NULL DEFAULT 5,
    min_reorder_quantity INT NOT NULL DEFAULT 1,
    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(cat_id) ON DELETE CASCADE,
    UNIQUE KEY unique_category_vendor (category_id, vendor),
    INDEX idx_st_metrics (category_id, vendor)
);

-- Lead time threshold configurations
CREATE TABLE IF NOT EXISTS lead_time_thresholds (
    id INT NOT NULL,
    category_id BIGINT,  -- NULL means default/global threshold
    vendor VARCHAR(100), -- NULL means applies to all vendors
    target_days INT NOT NULL DEFAULT 14,
    warning_days INT NOT NULL DEFAULT 21,
    critical_days INT NOT NULL DEFAULT 30,
    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(cat_id) ON DELETE CASCADE,
    UNIQUE KEY unique_category_vendor (category_id, vendor)
);

-- Sales velocity window configurations
CREATE TABLE IF NOT EXISTS sales_velocity_config (
    id INT NOT NULL,
    category_id BIGINT,  -- NULL means default/global threshold
    vendor VARCHAR(100), -- NULL means applies to all vendors
    daily_window_days INT NOT NULL DEFAULT 30,
    weekly_window_days INT NOT NULL DEFAULT 7,
    monthly_window_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(cat_id) ON DELETE CASCADE,
    UNIQUE KEY unique_category_vendor (category_id, vendor),
    INDEX idx_sv_metrics (category_id, vendor)
);

-- ABC Classification configurations
CREATE TABLE IF NOT EXISTS abc_classification_config (
    id INT NOT NULL PRIMARY KEY,
    a_threshold DECIMAL(5,2) NOT NULL DEFAULT 20.0,
    b_threshold DECIMAL(5,2) NOT NULL DEFAULT 50.0,
    classification_period_days INT NOT NULL DEFAULT 90,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

-- Safety stock configurations
CREATE TABLE IF NOT EXISTS safety_stock_config (
    id INT NOT NULL,
    category_id BIGINT,  -- NULL means default/global threshold
    vendor VARCHAR(100), -- NULL means applies to all vendors
    coverage_days INT NOT NULL DEFAULT 14,
    service_level DECIMAL(5,2) NOT NULL DEFAULT 95.0,
    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(cat_id) ON DELETE CASCADE,
    UNIQUE KEY unique_category_vendor (category_id, vendor),
    INDEX idx_ss_metrics (category_id, vendor)
);

-- Turnover rate configurations
CREATE TABLE IF NOT EXISTS turnover_config (
    id INT NOT NULL,
    category_id BIGINT,  -- NULL means default/global threshold
    vendor VARCHAR(100), -- NULL means applies to all vendors
    calculation_period_days INT NOT NULL DEFAULT 30,
    target_rate DECIMAL(10,2) NOT NULL DEFAULT 1.0,
    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(cat_id) ON DELETE CASCADE,
    UNIQUE KEY unique_category_vendor (category_id, vendor)
);

-- Insert default global thresholds 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);

INSERT INTO lead_time_thresholds (id, category_id, vendor, target_days, warning_days, critical_days)
VALUES (1, NULL, NULL, 14, 21, 30)
ON DUPLICATE KEY UPDATE
    target_days = VALUES(target_days),
    warning_days = VALUES(warning_days),
    critical_days = VALUES(critical_days);

INSERT INTO sales_velocity_config (id, category_id, vendor, daily_window_days, weekly_window_days, monthly_window_days)
VALUES (1, NULL, NULL, 30, 7, 90)
ON DUPLICATE KEY UPDATE
    daily_window_days = VALUES(daily_window_days),
    weekly_window_days = VALUES(weekly_window_days),
    monthly_window_days = VALUES(monthly_window_days);

INSERT INTO abc_classification_config (id, a_threshold, b_threshold, classification_period_days)
VALUES (1, 20.0, 50.0, 90)
ON DUPLICATE KEY UPDATE
    a_threshold = VALUES(a_threshold),
    b_threshold = VALUES(b_threshold),
    classification_period_days = VALUES(classification_period_days);

INSERT INTO safety_stock_config (id, category_id, vendor, coverage_days, service_level)
VALUES (1, NULL, NULL, 14, 95.0)
ON DUPLICATE KEY UPDATE
    coverage_days = VALUES(coverage_days),
    service_level = VALUES(service_level);

INSERT INTO turnover_config (id, category_id, vendor, calculation_period_days, target_rate)
VALUES (1, NULL, NULL, 30, 1.0)
ON DUPLICATE KEY UPDATE
    calculation_period_days = VALUES(calculation_period_days),
    target_rate = VALUES(target_rate);

-- 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.cat_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;