package mycourse

import (
	"context"
	v1 "hotgo/api/api/mycourse/v1"
	"hotgo/internal/library/contexts"
	"hotgo/internal/service"

	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/os/gtime"
)

type sMyCourse struct{}

func init() {
	service.RegisterMyCourse(New())
}

func New() *sMyCourse {
	return &sMyCourse{}
}

// GetList 获取我的课程列表
func (s *sMyCourse) GetList(ctx context.Context, req *v1.MyCourseListReq) (res *v1.MyCourseListRes, err error) {
	// 从JWT中间件解析出的用户ID
	userId := contexts.GetUserId(ctx)
	if userId <= 0 {
		return nil, gerror.New("用户未登录")
	}

	// 模拟数据 - 实际项目中应该从数据库查询
	// TODO: 后续可以替换为真实的数据库查询
	mockData := []*v1.MyCourseItem{
		{
			Id:            1,
			Title:         "Go语言基础教程",
			Description:   "从零开始学习Go语言，掌握基础语法和核心概念",
			Cover:         "https://example.com/covers/go-basic.jpg",
			Instructor:    "张老师",
			Duration:      7200, // 2小时
			Progress:      75,
			Status:        "learning",
			EnrollTime:    gtime.New("2024-01-15 10:30:00"),
			LastStudyTime: gtime.New("2024-01-20 14:20:00"),
		},
		{
			Id:            2,
			Title:         "Vue.js实战开发",
			Description:   "深入学习Vue.js框架，构建现代化前端应用",
			Cover:         "https://example.com/covers/vue-practice.jpg",
			Instructor:    "李老师",
			Duration:      10800, // 3小时
			Progress:      100,
			Status:        "completed",
			EnrollTime:    gtime.New("2024-01-10 09:15:00"),
			LastStudyTime: gtime.New("2024-01-18 16:45:00"),
		},
		{
			Id:            3,
			Title:         "MySQL数据库优化",
			Description:   "学习MySQL性能优化技巧和最佳实践",
			Cover:         "https://example.com/covers/mysql-optimization.jpg",
			Instructor:    "王老师",
			Duration:      5400, // 1.5小时
			Progress:      45,
			Status:        "learning",
			EnrollTime:    gtime.New("2024-01-20 14:00:00"),
			LastStudyTime: gtime.New("2024-01-22 10:30:00"),
		},
		{
			Id:            4,
			Title:         "Python数据分析",
			Description:   "使用Python进行数据分析和可视化",
			Cover:         "https://example.com/covers/python-analysis.jpg",
			Instructor:    "赵老师",
			Duration:      9000, // 2.5小时
			Progress:      100,
			Status:        "completed",
			EnrollTime:    gtime.New("2024-01-05 11:00:00"),
			LastStudyTime: gtime.New("2024-01-12 15:30:00"),
		},
	}

	// 根据状态筛选
	var filteredData []*v1.MyCourseItem
	if req.Status != "" {
		for _, item := range mockData {
			if item.Status == req.Status {
				filteredData = append(filteredData, item)
			}
		}
	} else {
		filteredData = mockData
	}

	totalCount := len(filteredData)

	// 分页处理
	pageNum := req.Page
	pageSize := req.PageSize
	if pageNum <= 0 {
		pageNum = 1
	}
	if pageSize <= 0 {
		pageSize = 10
	}

	start := (pageNum - 1) * pageSize
	end := start + pageSize

	var list []*v1.MyCourseItem
	if start >= totalCount {
		list = []*v1.MyCourseItem{}
	} else {
		if end > totalCount {
			end = totalCount
		}
		list = filteredData[start:end]
	}

	res = &v1.MyCourseListRes{
		List:     list,
		Total:    totalCount,
		Page:     pageNum,
		PageSize: pageSize,
	}

	return res, nil
}