package handler

import (
	"time"

	"github.com/gin-gonic/gin"

	"github.com/sundynix/pets-be/internal/middleware"
	"github.com/sundynix/pets-be/internal/service"
	"github.com/sundynix/pets-be/pkg/response"
)

// ListTasks GET /api/pets/:id/tasks?date=YYYY-MM-DD
func (h *Handler) ListTasks(c *gin.Context) {
	var date *time.Time
	if q := c.Query("date"); q != "" {
		if t, err := time.ParseInLocation("2006-01-02", q, time.Local); err == nil {
			date = &t
		}
	}
	tasks, err := h.svc.ListTasks(middleware.UserID(c), idParam(c, "id"), date)
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, tasks)
}

type taskReq struct {
	Title       string `json:"title"`
	Description string `json:"description"`
	Priority    string `json:"priority"`
	SheetType   string `json:"sheet_type"`
	Date        string `json:"date"` // 仅新增用，YYYY-MM-DD，默认今天
}

func (r taskReq) toInput() service.TaskInput {
	in := service.TaskInput{Title: r.Title, Description: r.Description, Priority: r.Priority, SheetType: r.SheetType}
	if r.Date != "" {
		if t, err := time.ParseInLocation("2006-01-02", r.Date, time.Local); err == nil {
			in.Date = &t
		}
	}
	return in
}

// CreateTask POST /api/pets/:id/tasks
func (h *Handler) CreateTask(c *gin.Context) {
	var req taskReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	if req.Title == "" {
		response.FailParams(c, "任务标题不能为空")
		return
	}
	t, err := h.svc.CreateTask(middleware.UserID(c), idParam(c, "id"), req.toInput())
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, t)
}

// UpdateTask PUT /api/tasks/:id
func (h *Handler) UpdateTask(c *gin.Context) {
	var req taskReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	t, err := h.svc.UpdateTask(middleware.UserID(c), idParam(c, "id"), req.toInput())
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, t)
}

// DeleteTask DELETE /api/tasks/:id
func (h *Handler) DeleteTask(c *gin.Context) {
	if err := h.svc.DeleteTask(middleware.UserID(c), idParam(c, "id")); err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, gin.H{"deleted": true})
}

// ToggleTask POST /api/tasks/:id/toggle
func (h *Handler) ToggleTask(c *gin.Context) {
	task, err := h.svc.ToggleTask(middleware.UserID(c), idParam(c, "id"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, task)
}

// CompleteAllTasks POST /api/pets/:id/tasks/complete-all
func (h *Handler) CompleteAllTasks(c *gin.Context) {
	tasks, err := h.svc.CompleteAllTasks(middleware.UserID(c), idParam(c, "id"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, tasks)
}

// GetPlan GET /api/pets/:id/plan
func (h *Handler) GetPlan(c *gin.Context) {
	plan, err := h.svc.GetPlan(middleware.UserID(c), idParam(c, "id"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, plan)
}

// DayPlan GET /api/pets/:id/day-plan?date=YYYY-MM-DD
func (h *Handler) DayPlan(c *gin.Context) {
	res, err := h.svc.DayPlan(middleware.UserID(c), idParam(c, "id"), c.Query("date"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, res)
}

// PlanCalendar GET /api/pets/:id/plan/calendar?month=YYYY-MM
func (h *Handler) PlanCalendar(c *gin.Context) {
	now := time.Now()
	year, month := now.Year(), int(now.Month())
	if q := c.Query("month"); q != "" {
		if t, err := time.Parse("2006-01", q); err == nil {
			year, month = t.Year(), int(t.Month())
		}
	}
	res, err := h.svc.Calendar(middleware.UserID(c), idParam(c, "id"), year, month)
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, res)
}

type aiPlanReq struct {
	Input string `json:"input"`
}

// CreateAIPlan POST /api/pets/:id/ai-plan
func (h *Handler) CreateAIPlan(c *gin.Context) {
	var req aiPlanReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	plan, err := h.svc.CreateAIPlan(middleware.UserID(c), idParam(c, "id"), req.Input)
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, plan)
}

// ApplyAIPlan POST /api/ai-plan/:id/apply
func (h *Handler) ApplyAIPlan(c *gin.Context) {
	plan, err := h.svc.ApplyAIPlan(middleware.UserID(c), idParam(c, "id"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, plan)
}

// TogglePlanTask POST /api/plan-tasks/:id/toggle
func (h *Handler) TogglePlanTask(c *gin.Context) {
	if err := h.svc.TogglePlanTask(middleware.UserID(c), idParam(c, "id")); err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, gin.H{"ok": true})
}

// planTaskReq 用户自己加/改的计划节点
type planTaskReq struct {
	Date        string `json:"date"`
	Title       string `json:"title"`
	Description string `json:"description"`
	SheetType   string `json:"sheet_type"`
	Daily       bool   `json:"daily"`
}

func (r planTaskReq) input() service.PlanTaskInput {
	return service.PlanTaskInput{Date: r.Date, Title: r.Title,
		Description: r.Description, SheetType: r.SheetType, Daily: r.Daily}
}

// AddPlanTask POST /api/pets/:id/plan-tasks 往 30 天计划里加一条
func (h *Handler) AddPlanTask(c *gin.Context) {
	var req planTaskReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	list, err := h.svc.AddPlanTask(middleware.UserID(c), idParam(c, "id"), req.input())
	if err != nil {
		respondErr(c, err)
		return
	}
	// daily 会一次建多条，统一返回数组，前端不用分两种情况处理
	response.OK(c, list)
}

// UpdatePlanTask PUT /api/plan-tasks/:id
func (h *Handler) UpdatePlanTask(c *gin.Context) {
	var req planTaskReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	if err := h.svc.UpdatePlanTask(middleware.UserID(c), idParam(c, "id"), req.input()); err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, nil)
}

// DeletePlanTask DELETE /api/plan-tasks/:id
func (h *Handler) DeletePlanTask(c *gin.Context) {
	if err := h.svc.DeletePlanTask(middleware.UserID(c), idParam(c, "id")); err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, nil)
}

// PlanMonthStatus GET /api/pets/:id/plan/month-status
// 首页「管理计划」那个提醒角标要的：本月剩几件、下月排了没有
func (h *Handler) PlanMonthStatus(c *gin.Context) {
	st, err := h.svc.PlanMonthStatus(middleware.UserID(c), idParam(c, "id"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, st)
}