CREATE TABLE IF NOT EXISTS `users` (
  `id` varchar(36) NOT NULL,
  `email` varchar(255) NOT NULL,
  `password_hash` varchar(255) NOT NULL,
  `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `email` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `materials` (
  `id` varchar(36) NOT NULL,
  `user_id` varchar(36) NOT NULL,
  `file_path` varchar(255) NOT NULL,
  `upload_type` enum('pdf','pptx','image') NOT NULL,
  `extracted_text` text,
  `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `user_id` (`user_id`),
  CONSTRAINT `materials_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `study_plans` (
  `id` varchar(36) NOT NULL,
  `user_id` varchar(36) NOT NULL,
  `material_id` varchar(36) NOT NULL,
  `test_date` date NOT NULL,
  `created_at` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `user_id` (`user_id`),
  KEY `material_id` (`material_id`),
  CONSTRAINT `study_plans_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE,
  CONSTRAINT `study_plans_ibfk_2` FOREIGN KEY (`material_id`) REFERENCES `materials` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `plan_items` (
  `id` varchar(36) NOT NULL,
  `plan_id` varchar(36) NOT NULL,
  `day_number` int(11) NOT NULL,
  `task_text` text NOT NULL,
  `is_done` tinyint(1) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`),
  KEY `plan_id` (`plan_id`),
  CONSTRAINT `plan_items_ibfk_1` FOREIGN KEY (`plan_id`) REFERENCES `study_plans` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;