package daytask

import (
	"app/commons/model/entity"
	"app/commons/services"
	"encoding/json"
	"time"

	"github.com/gin-gonic/gin"
)

// TaskApply 领取任务
func (s *Server) TaskApply(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()
	userId := ctx.UserId()

	type ApplyRequest struct {
		TaskId int64 `json:"taskId" binding:"required"`
	}

	var req ApplyRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 获取任务
	task := &entity.DtTask{}
	if err := db.Where("id = ? AND status = ?", req.TaskId, 1).First(task).Error; err != nil {
		ctx.Fail("task_not_found")
		return
	}

	// 检查任务剩余数量
	if task.RemainCount <= 0 {
		ctx.Fail("task_sold_out")
		return
	}

	// 获取用户
	user := &entity.DtUser{}
	if err := db.Where("id = ?", userId).First(user).Error; err != nil {
		ctx.Fail("user_not_found")
		return
	}

	// 检查用户等级
	if task.MinLevel > 0 {
		level := &entity.DtUserLevel{}
		db.Where("id = ?", user.LevelId).First(level)
		if level.Level < task.MinLevel {
			ctx.Fail("level_not_enough")
			return
		}
	}

	// 检查用户今日领取数量（0表示不限制）
	if task.DailyLimit > 0 {
		today := time.Now().Format("2006-01-02")
		var todayCount int64
		db.Model(&entity.DtUserTask{}).
			Where("user_id = ? AND task_id = ? AND DATE(FROM_UNIXTIME(created_at)) = ?", userId, req.TaskId, today).
			Count(&todayCount)
		if int(todayCount) >= task.DailyLimit {
			ctx.Fail("daily_limit_reached")
			return
		}
	}

	// 检查用户总领取数量（0表示不限制）
	if task.TotalLimit > 0 {
		var totalCount int64
		db.Model(&entity.DtUserTask{}).
			Where("user_id = ? AND task_id = ? AND status != ?", userId, req.TaskId, entity.UserTaskStatusAbandoned).
			Count(&totalCount)
		if int(totalCount) >= task.TotalLimit {
			ctx.Fail("total_limit_reached")
			return
		}
	}

	// 检查是否有进行中或待审核的任务
	var pendingCount int64
	db.Model(&entity.DtUserTask{}).
		Where("user_id = ? AND task_id = ? AND status IN (?, ?)", userId, req.TaskId, entity.UserTaskStatusPending, entity.UserTaskStatusSubmitted).
		Count(&pendingCount)
	if pendingCount > 0 {
		ctx.Fail("task_in_progress")
		return
	}

	// 事务：创建任务记录 + 扣减剩余数量
	tx := db.Begin()

	// 先原子扣减剩余数量，防止超领
	result := tx.Model(&entity.DtTask{}).
		Where("id = ? AND remain_count > 0", req.TaskId).
		UpdateColumn("remain_count", tx.Raw("remain_count - 1"))
	if result.Error != nil || result.RowsAffected == 0 {
		tx.Rollback()
		ctx.Fail("task_sold_out")
		return
	}

	// 创建任务记录
	userTask := &entity.DtUserTask{
		UserId:       userId,
		TaskId:       req.TaskId,
		TaskNo:       task.TaskNo,
		TaskTitle:    task.Title,
		RewardAmount: task.RewardAmount,
		Status:       entity.UserTaskStatusPending,
	}
	if err := tx.Create(userTask).Error; err != nil {
		tx.Rollback()
		ctx.Fail("claim_failed")
		return
	}

	tx.Commit()

	ctx.OK(userTask)
}

// TaskSubmit 提交任务
func (s *Server) TaskSubmit(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()
	userId := ctx.UserId()

	type SubmitRequest struct {
		UserTaskId  int64    `json:"userTaskId" binding:"required"`
		Screenshots []string `json:"screenshots" binding:"required"`
		Remark      string   `json:"remark"`
	}

	var req SubmitRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 获取用户任务
	userTask := &entity.DtUserTask{}
	if err := db.Where("id = ? AND user_id = ?", req.UserTaskId, userId).First(userTask).Error; err != nil {
		ctx.Fail("user_task_not_found")
		return
	}

	// 检查状态：进行中(0)、审核失败(-1)、已拒绝(3)或已打回(5)的任务可以提交
	if userTask.Status != entity.UserTaskStatusPending &&
		userTask.Status != entity.UserTaskStatusFailed &&
		userTask.Status != entity.UserTaskStatusRejected &&
		userTask.Status != entity.UserTaskStatusReturnBack {
		ctx.Fail("task_cannot_submit")
		return
	}

	// 获取任务检查是否需要截图
	task := &entity.DtTask{}
	db.Where("id = ?", userTask.TaskId).First(task)

	if task.RequireScreenshot == 1 && len(req.Screenshots) == 0 {
		ctx.Fail("screenshot_required")
		return
	}

	// 更新任务
	screenshotsJson, _ := json.Marshal(req.Screenshots)
	db.Model(&entity.DtUserTask{}).
		Where("id = ?", req.UserTaskId).
		Updates(map[string]interface{}{
			"screenshots":   string(screenshotsJson),
			"remark":        req.Remark,
			"submit_time":   time.Now().Unix(),
			"status":        entity.UserTaskStatusSubmitted,
			"reject_reason": "", // 重新提交时清空打回原因
		})

	ctx.OK(nil)
}

// TaskSupplementScreenshots 补充截图（待审核状态可以补充）
func (s *Server) TaskSupplementScreenshots(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()
	userId := ctx.UserId()

	type SupplementRequest struct {
		UserTaskId  int64    `json:"userTaskId" binding:"required"`
		Screenshots []string `json:"screenshots" binding:"required"` // 新增的截图
	}

	var req SupplementRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 获取用户任务
	userTask := &entity.DtUserTask{}
	if err := db.Where("id = ? AND user_id = ?", req.UserTaskId, userId).First(userTask).Error; err != nil {
		ctx.Fail("user_task_not_found")
		return
	}

	// 检查状态：只有待审核(1)的任务可以补充截图
	if userTask.Status != entity.UserTaskStatusSubmitted {
		ctx.Fail("task_cannot_supplement")
		return
	}

	// 解析现有截图
	existingScreenshots := make([]string, 0)
	if userTask.Screenshots != "" {
		json.Unmarshal([]byte(userTask.Screenshots), &existingScreenshots)
	}

	// 合并截图
	allScreenshots := append(existingScreenshots, req.Screenshots...)
	screenshotsJson, _ := json.Marshal(allScreenshots)

	// 更新任务
	db.Model(&entity.DtUserTask{}).
		Where("id = ?", req.UserTaskId).
		Update("screenshots", string(screenshotsJson))

	ctx.OK(gin.H{
		"screenshots": allScreenshots,
	})
}

// TaskAbandon 放弃任务
func (s *Server) TaskAbandon(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()
	userId := ctx.UserId()

	type AbandonRequest struct {
		UserTaskId int64 `json:"userTaskId" binding:"required"`
	}

	var req AbandonRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		ctx.Fail("invalid_params")
		return
	}

	// 获取用户任务
	userTask := &entity.DtUserTask{}
	if err := db.Where("id = ? AND user_id = ?", req.UserTaskId, userId).First(userTask).Error; err != nil {
		ctx.Fail("user_task_not_found")
		return
	}

	// 只有进行中的任务可以放弃
	if userTask.Status != entity.UserTaskStatusPending {
		ctx.Fail("task_cannot_abandon")
		return
	}

	// 事务：更新状态 + 恢复数量
	tx := db.Begin()

	tx.Model(&entity.DtUserTask{}).
		Where("id = ?", req.UserTaskId).
		Update("status", entity.UserTaskStatusAbandoned)

	tx.Model(&entity.DtTask{}).
		Where("id = ?", userTask.TaskId).
		UpdateColumn("remain_count", tx.Raw("remain_count + 1"))

	tx.Commit()

	ctx.OK(nil)
}

// TaskMy 我的任务列表
func (s *Server) TaskMy(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()
	userId := ctx.UserId()

	status := ctx.QueryInt64("status", -99) // -99表示全部
	paging := &services.Pagination{
		Current: ctx.QueryInt64("current", 1),
		Size:    ctx.QueryInt64("size", 20),
	}

	query := db.Model(&entity.DtUserTask{}).Where("user_id = ?", userId)

	if status != -99 {
		query = query.Where("status = ?", status)
	}

	query.Count(&paging.Total)
	paging.Computer()

	userTasks := make([]*entity.DtUserTask, 0)
	query.Order("created_at DESC").
		Offset(int(paging.Start)).
		Limit(int(paging.Size)).
		Find(&userTasks)

	// 批量获取关联的任务信息（避免N+1查询）
	type TaskWithInfo struct {
		*entity.DtUserTask
		Task *entity.DtTask `json:"task"`
	}

	// 收集所有 taskId
	taskIds := make([]int64, 0, len(userTasks))
	for _, ut := range userTasks {
		taskIds = append(taskIds, ut.TaskId)
	}

	// 一次性查询所有任务
	taskMap := make(map[int64]*entity.DtTask)
	if len(taskIds) > 0 {
		tasks := make([]*entity.DtTask, 0)
		db.Where("id IN ?", taskIds).Find(&tasks)
		for _, t := range tasks {
			taskMap[t.Id] = t
		}
	}

	result := make([]*TaskWithInfo, 0)
	for _, ut := range userTasks {
		task := taskMap[ut.TaskId]
		if task == nil {
			task = &entity.DtTask{}
		}
		result = append(result, &TaskWithInfo{
			DtUserTask: ut,
			Task:       task,
		})
	}

	ctx.OK(gin.H{
		"list":   result,
		"paging": paging,
	})
}

// TaskMyDetail 我的任务详情
func (s *Server) TaskMyDetail(c *gin.Context) {
	ctx := s.FromContext(c)
	db := s.DB()
	userId := ctx.UserId()

	userTaskId := ctx.QueryInt64("id", 0)
	if userTaskId == 0 {
		ctx.Fail("id_required")
		return
	}

	// 获取用户任务
	userTask := &entity.DtUserTask{}
	if err := db.Where("id = ? AND user_id = ?", userTaskId, userId).First(userTask).Error; err != nil {
		ctx.Fail("user_task_not_found")
		return
	}

	// 获取任务
	task := &entity.DtTask{}
	db.Where("id = ?", userTask.TaskId).First(task)

	// 获取任务分类
	category := &entity.DtTaskCategory{}
	db.Where("id = ?", task.CategoryId).First(category)

	// 获取任务步骤
	steps := make([]*entity.DtTaskStep, 0)
	db.Model(&entity.DtTaskStep{}).
		Where("task_id = ?", userTask.TaskId).
		Order("step_no ASC").
		Find(&steps)

	ctx.OK(gin.H{
		"userTask": userTask,
		"task":     task,
		"category": category,
		"steps":    steps,
	})
}