-- ================================================================
-- 用户课程学习进度表迁移脚本
-- 创建日期: 2026-01-30
-- 功能: 添加用户课程进度追踪表和用户资料进度追踪表
-- ================================================================

-- 事务开始
START TRANSACTION;

-- ================================================================
-- 1. 创建用户课程进度表
-- ================================================================
CREATE TABLE IF NOT EXISTS user_course_progress (
    id INT PRIMARY KEY AUTO_INCREMENT,
    user_id INT NOT NULL COMMENT '用户ID',
    course_id INT NOT NULL COMMENT '课程ID',
    status VARCHAR(20) NOT NULL DEFAULT 'not_started' COMMENT '学习状态：not_started/in_progress/completed',
    progress_percent FLOAT NOT NULL DEFAULT 0 COMMENT '完成百分比(0-100)',
    completed_materials INT NOT NULL DEFAULT 0 COMMENT '已完成资料数',
    total_materials INT NOT NULL DEFAULT 0 COMMENT '总资料数',
    total_study_time INT NOT NULL DEFAULT 0 COMMENT '总学习时长(秒)',
    first_accessed_at DATETIME COMMENT '首次访问时间',
    last_accessed_at DATETIME COMMENT '最后访问时间',
    completed_at DATETIME COMMENT '完成时间',
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    UNIQUE KEY uq_user_course (user_id, course_id),
    INDEX idx_user_course_progress_user (user_id),
    INDEX idx_user_course_progress_course (course_id),
    INDEX idx_user_course_progress_status (status),
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (course_id) REFERENCES courses(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='用户课程进度表';

-- ================================================================
-- 2. 创建用户资料进度表
-- ================================================================
CREATE TABLE IF NOT EXISTS user_material_progress (
    id INT PRIMARY KEY AUTO_INCREMENT,
    user_id INT NOT NULL COMMENT '用户ID',
    material_id INT NOT NULL COMMENT '资料ID',
    course_id INT NOT NULL COMMENT '课程ID（冗余字段）',
    is_completed BOOLEAN NOT NULL DEFAULT FALSE COMMENT '是否已完成',
    progress_percent FLOAT NOT NULL DEFAULT 0 COMMENT '阅读/播放进度百分比(0-100)',
    last_position INT NOT NULL DEFAULT 0 COMMENT '上次播放位置(秒)',
    total_duration INT NOT NULL DEFAULT 0 COMMENT '媒体总时长(秒)',
    study_time INT NOT NULL DEFAULT 0 COMMENT '学习时长(秒)',
    first_accessed_at DATETIME COMMENT '首次访问时间',
    last_accessed_at DATETIME COMMENT '最后访问时间',
    completed_at DATETIME COMMENT '完成时间',
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    UNIQUE KEY uq_user_material (user_id, material_id),
    INDEX idx_user_material_progress_user (user_id),
    INDEX idx_user_material_progress_material (material_id),
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (material_id) REFERENCES course_materials(id) ON DELETE CASCADE,
    FOREIGN KEY (course_id) REFERENCES courses(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='用户资料进度表';

-- 提交事务
COMMIT;

-- ================================================================
-- 验证表创建
-- ================================================================
SELECT 'user_course_progress' as table_name, COUNT(*) as count FROM information_schema.tables 
WHERE table_schema = DATABASE() AND table_name = 'user_course_progress'
UNION ALL
SELECT 'user_material_progress' as table_name, COUNT(*) as count FROM information_schema.tables 
WHERE table_schema = DATABASE() AND table_name = 'user_material_progress';