-- content v2 新增表（选修课/备课计划/课程计划）

CREATE TABLE IF NOT EXISTS `content_elective_courses` (
  `id` VARCHAR(32) NOT NULL,
  `title` VARCHAR(255) NOT NULL,
  `subject_id` VARCHAR(32) NOT NULL,
  `teacher_id` VARCHAR(32) NOT NULL,
  `capacity` INT NOT NULL DEFAULT 30,
  `enrolled_count` INT NOT NULL DEFAULT 0,
  `status` VARCHAR(32) NOT NULL DEFAULT 'open',
  `description` TEXT NULL,
  `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  INDEX `idx_elective_subject` (`subject_id`),
  INDEX `idx_elective_teacher` (`teacher_id`),
  INDEX `idx_elective_status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `content_elective_selections` (
  `id` VARCHAR(32) NOT NULL,
  `student_id` VARCHAR(32) NOT NULL,
  `course_id` VARCHAR(32) NOT NULL,
  `status` VARCHAR(32) NOT NULL DEFAULT 'selected',
  `selected_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `dropped_at` TIMESTAMP NULL,
  PRIMARY KEY (`id`),
  INDEX `idx_selection_student` (`student_id`),
  INDEX `idx_selection_course` (`course_id`),
  INDEX `idx_selection_student_course` (`student_id`, `course_id`),
  INDEX `idx_selection_status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `content_lesson_plans` (
  `id` VARCHAR(32) NOT NULL,
  `teacher_id` VARCHAR(32) NOT NULL,
  `class_id` VARCHAR(32) NOT NULL,
  `subject_id` VARCHAR(32) NOT NULL,
  `title` VARCHAR(255) NOT NULL,
  `content` TEXT NOT NULL,
  `status` VARCHAR(32) NOT NULL DEFAULT 'draft',
  `metadata` JSON NULL,
  `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  INDEX `idx_lesson_plan_teacher` (`teacher_id`),
  INDEX `idx_lesson_plan_class` (`class_id`),
  INDEX `idx_lesson_plan_subject` (`subject_id`),
  INDEX `idx_lesson_plan_status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `content_course_plans` (
  `id` VARCHAR(32) NOT NULL,
  `student_id` VARCHAR(32) NOT NULL,
  `class_id` VARCHAR(32) NOT NULL,
  `subject_id` VARCHAR(32) NOT NULL,
  `title` VARCHAR(255) NOT NULL,
  `plan_type` VARCHAR(32) NOT NULL DEFAULT 'default',
  `content` TEXT NOT NULL,
  `status` VARCHAR(32) NOT NULL DEFAULT 'active',
  `metadata` JSON NULL,
  `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  INDEX `idx_course_plan_student` (`student_id`),
  INDEX `idx_course_plan_class` (`class_id`),
  INDEX `idx_course_plan_student_type` (`student_id`, `plan_type`),
  INDEX `idx_course_plan_status` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;