-- Messaging system tied to projects
CREATE TABLE IF NOT EXISTS `messages` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `project_id` INT NOT NULL,
  `user_id` INT NOT NULL,
  `message` TEXT NOT NULL,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (`project_id`) REFERENCES `projects`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Calendar events
CREATE TABLE IF NOT EXISTS `calendar_events` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `title` VARCHAR(255) NOT NULL,
  `start_event` DATETIME NOT NULL,
  `end_event` DATETIME NOT NULL,
  `project_id` INT,
  `user_id` INT,
  `description` TEXT,
  FOREIGN KEY (`project_id`) REFERENCES `projects`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Approvals for assets
CREATE TABLE IF NOT EXISTS `approvals` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `asset_id` INT NOT NULL,
  `user_id` INT NOT NULL,
  `status` ENUM('Pending', 'Approved', 'Rejected') NOT NULL DEFAULT 'Pending',
  `comments` TEXT,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  FOREIGN KEY (`asset_id`) REFERENCES `assets`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Metrics from ad platforms
CREATE TABLE IF NOT EXISTS `metrics` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `project_id` INT NOT NULL,
  `platform` VARCHAR(50) NOT NULL, -- e.g., 'Facebook', 'Google Ads'
  `date` DATE NOT NULL,
  `impressions` INT,
  `clicks` INT,
  `conversions` INT,
  `spend` DECIMAL(10, 2),
  `engagement` INT,
  `reach` INT,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  UNIQUE KEY `project_platform_date` (`project_id`, `platform`, `date`),
  FOREIGN KEY (`project_id`) REFERENCES `projects`(`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- Secure storage for API tokens
CREATE TABLE IF NOT EXISTS `api_tokens` (
  `id` INT AUTO_INCREMENT PRIMARY KEY,
  `service` VARCHAR(50) NOT NULL UNIQUE, -- e.g., 'meta_ads', 'google_ads'
  `access_token` TEXT NOT NULL,
  `refresh_token` TEXT,
  `expires_at` TIMESTAMP,
  `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;