-- ============================================
-- Sistema de Tickets - Esquema de Base de Datos
-- ============================================

CREATE DATABASE IF NOT EXISTS ticket_system CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
USE ticket_system;

-- Usuarios del sistema
CREATE TABLE IF NOT EXISTS users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(120) NOT NULL,
    email VARCHAR(150) NOT NULL UNIQUE,
    password_hash VARCHAR(255) NOT NULL,
    role ENUM('admin', 'tecnico', 'cliente') NOT NULL DEFAULT 'cliente',
    active TINYINT(1) NOT NULL DEFAULT 1,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB;

-- Tokens de sesión (login basado en token, no solo sesión PHP)
CREATE TABLE IF NOT EXISTS auth_tokens (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    token_hash CHAR(64) NOT NULL,
    user_agent VARCHAR(255) DEFAULT NULL,
    ip_address VARCHAR(45) DEFAULT NULL,
    expires_at DATETIME NOT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    INDEX idx_token_hash (token_hash)
) ENGINE=InnoDB;

-- Casos / Tickets
CREATE TABLE IF NOT EXISTS cases (
    id INT AUTO_INCREMENT PRIMARY KEY,
    case_number VARCHAR(9) NOT NULL UNIQUE COMMENT 'Formato TIK000001, visible al usuario',
    title VARCHAR(180) NOT NULL,
    description TEXT NOT NULL,
    status ENUM('abierto', 'en_progreso', 'cerrado') NOT NULL DEFAULT 'abierto',
    priority ENUM('baja', 'media', 'alta') NOT NULL DEFAULT 'media',
    created_by INT NOT NULL,
    assigned_to INT DEFAULT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (created_by) REFERENCES users(id),
    FOREIGN KEY (assigned_to) REFERENCES users(id) ON DELETE SET NULL
) ENGINE=InnoDB;

-- Presupuestos asociados a un caso
CREATE TABLE IF NOT EXISTS budgets (
    id INT AUTO_INCREMENT PRIMARY KEY,
    case_id INT NOT NULL,
    amount DECIMAL(10,2) NOT NULL,
    description VARCHAR(255) DEFAULT NULL,
    status ENUM('pendiente', 'aprobado', 'rechazado') NOT NULL DEFAULT 'pendiente',
    created_by INT NOT NULL,
    approved_by INT DEFAULT NULL,
    approved_at DATETIME DEFAULT NULL,
    rejection_reason VARCHAR(255) DEFAULT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (case_id) REFERENCES cases(id) ON DELETE CASCADE,
    FOREIGN KEY (created_by) REFERENCES users(id),
    FOREIGN KEY (approved_by) REFERENCES users(id) ON DELETE SET NULL
) ENGINE=InnoDB;

-- Historial de actividad de un caso (auditoría simple)
CREATE TABLE IF NOT EXISTS case_activity (
    id INT AUTO_INCREMENT PRIMARY KEY,
    case_id INT NOT NULL,
    user_id INT NOT NULL,
    action VARCHAR(255) NOT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (case_id) REFERENCES cases(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id)
) ENGINE=InnoDB;

-- Usuario admin de prueba (password: Admin123!)
-- Genera tu propio hash con password_hash() en PHP antes de usar en producción.
INSERT INTO users (name, email, password_hash, role) VALUES
('Administrador', 'admin@demo.com', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'admin');
-- Nota: el hash de arriba corresponde a "password". Cámbialo apenas puedas.