-- Initial Schema for Petrol Bunk Management System

-- Users and Roles
CREATE TABLE IF NOT EXISTS `users` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(100) NOT NULL,
    `email` VARCHAR(100) NOT NULL UNIQUE,
    `password` VARCHAR(255) NOT NULL,
    `role` ENUM('Superadmin', 'Manager', 'Attendant', 'Accountant') NOT NULL,
    `bunk_id` INT,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- Master Data
CREATE TABLE IF NOT EXISTS `bunks` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(255) NOT NULL,
    `owner` VARCHAR(255),
    `contact` VARCHAR(50),
    `location` TEXT,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS `fuel_types` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(50) NOT NULL UNIQUE,
    `unit` VARCHAR(20) DEFAULT 'Litre'
);

CREATE TABLE IF NOT EXISTS `tanks` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(100) NOT NULL,
    `bunk_id` INT NOT NULL,
    `fuel_type_id` INT NOT NULL,
    `capacity` DECIMAL(10, 2) NOT NULL,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE,
    FOREIGN KEY (`fuel_type_id`) REFERENCES `fuel_types`(`id`)
);

CREATE TABLE IF NOT EXISTS `pumps` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(100) NOT NULL,
    `bunk_id` INT NOT NULL,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS `nozzles` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(100) NOT NULL,
    `pump_id` INT NOT NULL,
    `tank_id` INT NOT NULL,
    FOREIGN KEY (`pump_id`) REFERENCES `pumps`(`id`) ON DELETE CASCADE,
    FOREIGN KEY (`tank_id`) REFERENCES `tanks`(`id`) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS `price_history` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `fuel_type_id` INT NOT NULL,
    `bunk_id` INT NOT NULL,
    `price` DECIMAL(10, 2) NOT NULL,
    `date` DATE NOT NULL,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY `bunk_fuel_date` (`bunk_id`, `fuel_type_id`, `date`),
    FOREIGN KEY (`fuel_type_id`) REFERENCES `fuel_types`(`id`),
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE
);

-- Daily Operations
CREATE TABLE IF NOT EXISTS `daybook` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `bunk_id` INT NOT NULL,
    `nozzle_id` INT NOT NULL,
    `date` DATE NOT NULL,
    `opening_reading` DECIMAL(10, 2) NOT NULL,
    `closing_reading` DECIMAL(10, 2),
    `testing` DECIMAL(10, 2) DEFAULT 0,
    `sale` DECIMAL(10, 2) GENERATED ALWAYS AS (closing_reading - opening_reading - testing) STORED,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY `bunk_nozzle_date` (`bunk_id`, `nozzle_id`, `date`),
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE,
    FOREIGN KEY (`nozzle_id`) REFERENCES `nozzles`(`id`) ON DELETE CASCADE
);

-- Credit Sales
CREATE TABLE IF NOT EXISTS `credit_customers` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(255) NOT NULL,
    `contact` VARCHAR(50),
    `bunk_id` INT NOT NULL,
    `credit_limit` DECIMAL(10, 2) DEFAULT 0,
    `outstanding_balance` DECIMAL(10, 2) DEFAULT 0,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS `credit_sales` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `bunk_id` INT NOT NULL,
    `customer_id` INT NOT NULL,
    `date` DATE NOT NULL,
    `fuel_type_id` INT NOT NULL,
    `quantity` DECIMAL(10, 2) NOT NULL,
    `rate` DECIMAL(10, 2) NOT NULL,
    `amount` DECIMAL(10, 2) NOT NULL,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE,
    FOREIGN KEY (`customer_id`) REFERENCES `credit_customers`(`id`),
    FOREIGN KEY (`fuel_type_id`) REFERENCES `fuel_types`(`id`)
);

-- Receipts and Expenses
CREATE TABLE IF NOT EXISTS `fuel_receipts` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `bunk_id` INT NOT NULL,
    `supplier` VARCHAR(255),
    `invoice_number` VARCHAR(100),
    `fuel_type_id` INT NOT NULL,
    `quantity` DECIMAL(10, 2) NOT NULL,
    `rate` DECIMAL(10, 2) NOT NULL,
    `amount` DECIMAL(10, 2) NOT NULL,
    `date` DATE NOT NULL,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE,
    FOREIGN KEY (`fuel_type_id`) REFERENCES `fuel_types`(`id`)
);

CREATE TABLE IF NOT EXISTS `expenses` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `bunk_id` INT NOT NULL,
    `category` VARCHAR(100) NOT NULL,
    `amount` DECIMAL(10, 2) NOT NULL,
    `description` TEXT,
    `payment_mode` VARCHAR(50),
    `date` DATE NOT NULL,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE
);

-- Product & Stock
CREATE TABLE IF NOT EXISTS `products` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(255) NOT NULL,
    `category` VARCHAR(100),
    `price` DECIMAL(10, 2) NOT NULL,
    `bunk_id` INT NOT NULL,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS `stock` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `product_id` INT NOT NULL,
    `date` DATE NOT NULL,
    `opening_stock` INT NOT NULL,
    `sales` INT DEFAULT 0,
    `closing_stock` INT GENERATED ALWAYS AS (opening_stock - sales) STORED,
    `bunk_id` INT NOT NULL,
    UNIQUE KEY `bunk_product_date` (`bunk_id`, `product_id`, `date`),
    FOREIGN KEY (`product_id`) REFERENCES `products`(`id`) ON DELETE CASCADE,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE
);

-- Accounts
CREATE TABLE IF NOT EXISTS `accounts` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `name` VARCHAR(255) NOT NULL,
    `type` ENUM('Owner', 'Bank', 'OD', 'Supplier', 'Customer', 'Cash') NOT NULL,
    `bunk_id` INT NOT NULL,
    `balance` DECIMAL(12, 2) DEFAULT 0,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS `transactions` (
    `id` INT AUTO_INCREMENT PRIMARY KEY,
    `bunk_id` INT NOT NULL,
    `date` DATE NOT NULL,
    `account_id` INT NOT NULL,
    `type` ENUM('Debit', 'Credit') NOT NULL,
    `amount` DECIMAL(10, 2) NOT NULL,
    `description` TEXT,
    `related_entity_type` VARCHAR(50), -- e.g., 'credit_sale', 'expense', 'fuel_receipt'
    `related_entity_id` INT,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`bunk_id`) REFERENCES `bunks`(`id`) ON DELETE CASCADE,
    FOREIGN KEY (`account_id`) REFERENCES `accounts`(`id`)
);

-- Add a superadmin user
INSERT IGNORE INTO `users` (`name`, `email`, `password`, `role`) VALUES
('Superadmin', 'admin@example.com', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'Superadmin'); -- password is "password"