USE inventory_db;

CREATE TABLE IF NOT EXISTS chart_of_accounts (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    account_number VARCHAR(20) NOT NULL UNIQUE,
    account_name VARCHAR(255) NOT NULL,
    account_type ENUM('asset', 'liability', 'equity', 'revenue', 'expense') NOT NULL,
    parent_id INT(11) NULL,
    description TEXT NULL,
    opening_balance DECIMAL(10,2) DEFAULT 0.00,
    current_balance DECIMAL(10,2) DEFAULT 0.00,
    is_active BOOLEAN DEFAULT TRUE,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (parent_id) REFERENCES chart_of_accounts(id) ON DELETE SET NULL,
    INDEX idx_account_type (account_type),
    INDEX idx_parent (parent_id),
    INDEX idx_account_number (account_number)
);

CREATE TABLE IF NOT EXISTS journal_entries (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    entry_number VARCHAR(50) NOT NULL UNIQUE,
    entry_date DATE NOT NULL,
    description TEXT NULL,
    reference_number VARCHAR(50) NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    INDEX idx_entry_date (entry_date),
    INDEX idx_entry_number (entry_number)
);

CREATE TABLE IF NOT EXISTS account_transactions (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    journal_entry_id INT(11) NOT NULL,
    account_id INT(11) NOT NULL,
    debit_amount DECIMAL(10,2) DEFAULT 0.00,
    credit_amount DECIMAL(10,2) DEFAULT 0.00,
    description TEXT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (journal_entry_id) REFERENCES journal_entries(id) ON DELETE CASCADE,
    FOREIGN KEY (account_id) REFERENCES chart_of_accounts(id) ON DELETE RESTRICT,
    INDEX idx_journal_entry (journal_entry_id),
    INDEX idx_account (account_id),
    INDEX idx_debit_credit (debit_amount, credit_amount)
);