-- Database struktur til historisk vendor data (Bygma m.fl.)
-- Dette skema håndterer både historiske og fremtidige priser fra leverandører

-- Hovedtabel for leverandører
CREATE TABLE IF NOT EXISTS vendors (
    id INT AUTO_INCREMENT PRIMARY KEY,
    vendor_name VARCHAR(255) NOT NULL,
    vendor_code VARCHAR(100),
    contact_info JSON,
    is_active BOOLEAN DEFAULT TRUE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    
    UNIQUE KEY unique_vendor_code (vendor_code),
    INDEX idx_vendor_name (vendor_name),
    INDEX idx_active (is_active)
);

-- Produktkategorier og varegrupper
CREATE TABLE IF NOT EXISTS product_categories (
    id INT AUTO_INCREMENT PRIMARY KEY,
    category_code VARCHAR(100) NOT NULL,
    category_name VARCHAR(255) NOT NULL,
    parent_category_id INT,
    vendor_id INT,
    description TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    
    FOREIGN KEY (parent_category_id) REFERENCES product_categories(id) ON DELETE SET NULL,
    FOREIGN KEY (vendor_id) REFERENCES vendors(id) ON DELETE CASCADE,
    UNIQUE KEY unique_category_vendor (category_code, vendor_id),
    INDEX idx_category_name (category_name),
    INDEX idx_parent_category (parent_category_id)
);

-- Historisk produktdata fra leverandører
CREATE TABLE IF NOT EXISTS vendor_products_history (
    id INT AUTO_INCREMENT PRIMARY KEY,
    vendor_id INT NOT NULL,
    category_id INT,
    
    -- Produkt identifikation
    vendor_product_code VARCHAR(255) NOT NULL,
    vendor_db_number VARCHAR(100),
    product_name TEXT NOT NULL,
    product_type VARCHAR(255),
    product_description TEXT,
    
    -- Produktspecifikationer
    unit VARCHAR(50) NOT NULL, -- M, STK, PK, etc.
    net_weight_kg DECIMAL(10,3),
    functional_unit VARCHAR(100),
    functional_unit_count DECIMAL(10,3),
    conversion_factor DECIMAL(10,6),
    
    -- Miljødata (ESG)
    co2_a1_a3_kg DECIMAL(15,6), -- Total A1-A3 (kg CO2 eq)
    co2_c3_kg DECIMAL(15,6),    -- Total C3 (kg CO2 eq) 
    co2_c4_kg DECIMAL(15,6),    -- Total C4 (kg CO2 eq)
    co2_per_unit DECIMAL(15,6), -- A1-A3 GWP total per enhed
    epd_link VARCHAR(500),
    epd_document VARCHAR(255),
    
    -- Metadata
    source_file VARCHAR(255),
    import_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    valid_from DATE NOT NULL,
    valid_to DATE,
    is_current BOOLEAN DEFAULT TRUE,
    
    FOREIGN KEY (vendor_id) REFERENCES vendors(id) ON DELETE CASCADE,
    FOREIGN KEY (category_id) REFERENCES product_categories(id) ON DELETE SET NULL,
    INDEX idx_vendor_product (vendor_id, vendor_product_code),
    INDEX idx_product_name (product_name(100)),
    INDEX idx_valid_period (valid_from, valid_to),
    INDEX idx_current (is_current),
    INDEX idx_import_date (import_date)
);

-- Prishistorik fra leverandører
CREATE TABLE IF NOT EXISTS vendor_price_history (
    id INT AUTO_INCREMENT PRIMARY KEY,
    vendor_id INT NOT NULL,
    product_history_id INT NOT NULL,
    
    -- Ordre information
    order_number VARCHAR(100),
    invoice_date DATE NOT NULL,
    delivery_date DATE,
    project_number VARCHAR(100),
    
    -- Pris og mængde
    quantity DECIMAL(15,3) NOT NULL,
    unit_price_dkk DECIMAL(15,2) NOT NULL,
    total_price_dkk DECIMAL(15,2) NOT NULL,
    currency VARCHAR(10) DEFAULT 'DKK',
    
    -- Beregnet miljøpåvirkning for denne ordre
    total_co2_a1_a3 DECIMAL(15,6),
    total_co2_c3 DECIMAL(15,6),
    total_co2_c4 DECIMAL(15,6),
    
    -- Metadata
    source_file VARCHAR(255),
    import_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    
    FOREIGN KEY (vendor_id) REFERENCES vendors(id) ON DELETE CASCADE,
    FOREIGN KEY (product_history_id) REFERENCES vendor_products_history(id) ON DELETE CASCADE,
    INDEX idx_vendor_date (vendor_id, invoice_date),
    INDEX idx_order_number (order_number),
    INDEX idx_project_number (project_number),
    INDEX idx_price_date (invoice_date),
    INDEX idx_import_date (import_date)
);

-- Aggregeret prisoversigt for hurtige opslag (materialized view concept)
CREATE TABLE IF NOT EXISTS vendor_current_prices (
    id INT AUTO_INCREMENT PRIMARY KEY,
    vendor_id INT NOT NULL,
    vendor_product_code VARCHAR(255) NOT NULL,
    product_name TEXT NOT NULL,
    
    -- Aktuelle priser (baseret på seneste data)
    current_unit_price_dkk DECIMAL(15,2),
    last_purchase_date DATE,
    last_purchase_quantity DECIMAL(15,3),
    
    -- Prisstatistik (sidste 12 måneder)
    avg_price_12m DECIMAL(15,2),
    min_price_12m DECIMAL(15,2),
    max_price_12m DECIMAL(15,2),
    purchase_count_12m INT DEFAULT 0,
    total_quantity_12m DECIMAL(15,3) DEFAULT 0,
    
    -- Miljødata
    co2_per_unit DECIMAL(15,6),
    
    -- Metadata
    last_updated TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    
    FOREIGN KEY (vendor_id) REFERENCES vendors(id) ON DELETE CASCADE,
    UNIQUE KEY unique_vendor_product (vendor_id, vendor_product_code),
    INDEX idx_product_name (product_name(100)),
    INDEX idx_current_price (current_unit_price_dkk),
    INDEX idx_last_purchase (last_purchase_date)
);

-- Import log til at tracke data imports
CREATE TABLE IF NOT EXISTS vendor_import_log (
    id INT AUTO_INCREMENT PRIMARY KEY,
    vendor_id INT NOT NULL,
    source_file VARCHAR(255) NOT NULL,
    file_hash VARCHAR(64), -- SHA256 hash for duplicate detection
    
    -- Import statistik
    records_processed INT DEFAULT 0,
    records_imported INT DEFAULT 0,
    records_updated INT DEFAULT 0,
    records_failed INT DEFAULT 0,
    
    -- Import periode
    data_period_start DATE,
    data_period_end DATE,
    
    -- Status
    import_status ENUM('pending', 'processing', 'completed', 'failed') DEFAULT 'pending',
    error_message TEXT,
    
    -- Metadata
    imported_by VARCHAR(100),
    import_started_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    import_completed_at TIMESTAMP NULL,
    
    FOREIGN KEY (vendor_id) REFERENCES vendors(id) ON DELETE CASCADE,
    INDEX idx_vendor_import (vendor_id, import_started_at),
    INDEX idx_file_hash (file_hash),
    INDEX idx_import_status (import_status)
);

-- Insert Bygma as vendor
INSERT INTO vendors (vendor_name, vendor_code, contact_info, is_active) 
VALUES (
    'Bygma A/S', 
    'BYGMA', 
    JSON_OBJECT(
        'website', 'https://www.bygma.dk',
        'customer_number', '156793',
        'company_name', 'Tømrer- og Snedker Mikael Holck ApS'
    ),
    TRUE
) ON DUPLICATE KEY UPDATE updated_at = CURRENT_TIMESTAMP;