package handler

import (
	"strconv"
	"time"

	"kra/internal/server/httpx"
	"kra/internal/service"
	"kra/internal/service/dto"

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

type Announcement struct{ service *service.AnnouncementService }

func NewAnnouncement(service *service.AnnouncementService) *Announcement {
	return &Announcement{service: service}
}

func announcementInput(req dto.AnnouncementRequest) service.AnnouncementInput {
	return service.AnnouncementInput{ID: req.ID, Title: req.Title, Content: req.Content, UserID: req.UserID, Attachments: req.Attachments}
}

func (h *Announcement) Create(c *gin.Context) {
	var req dto.AnnouncementRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		httpx.Fail(c, err.Error())
		return
	}
	if err := h.service.Create(c.Request.Context(), announcementInput(req)); err != nil {
		httpx.Fail(c, "创建失败")
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "创建成功")
}

func (h *Announcement) Delete(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Query("ID"), 10, 64)
	if err := h.service.Delete(c.Request.Context(), uint(id)); err != nil {
		httpx.Fail(c, "删除失败")
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "删除成功")
}

func (h *Announcement) DeleteByIDs(c *gin.Context) {
	values := c.QueryArray("IDs[]")
	if len(values) == 0 {
		values = c.QueryArray("IDs")
	}
	ids := make([]uint, 0, len(values))
	for _, value := range values {
		id, err := strconv.ParseUint(value, 10, 64)
		if err != nil || id == 0 {
			httpx.Fail(c, "参数错误")
			return
		}
		ids = append(ids, uint(id))
	}
	if err := h.service.DeleteByIDs(c.Request.Context(), ids); err != nil {
		httpx.Fail(c, "批量删除失败")
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "批量删除成功")
}

func (h *Announcement) Update(c *gin.Context) {
	var req dto.AnnouncementRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		httpx.Fail(c, err.Error())
		return
	}
	if err := h.service.Update(c.Request.Context(), announcementInput(req)); err != nil {
		httpx.Fail(c, "更新失败")
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "更新成功")
}

func (h *Announcement) Find(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Query("ID"), 10, 64)
	item, err := h.service.Find(c.Request.Context(), uint(id))
	if err != nil {
		httpx.Fail(c, "查询失败")
		return
	}
	httpx.OKWithData(c, item)
}

func (h *Announcement) List(c *gin.Context) {
	page, _ := strconv.Atoi(c.Query("page"))
	pageSize, _ := strconv.Atoi(c.Query("pageSize"))
	start, startErr := parseTime(c.Query("startCreatedAt"))
	end, endErr := parseTime(c.Query("endCreatedAt"))
	if startErr != nil || endErr != nil || (start == nil) != (end == nil) {
		httpx.Fail(c, "创建日期范围不合法")
		return
	}
	items, total, err := h.service.List(c.Request.Context(), page, pageSize, start, end)
	if err != nil {
		httpx.Fail(c, "获取失败")
		return
	}
	httpx.Write(c, httpx.CodeSuccess, httpx.PageResult{List: items, Total: total, Page: page, PageSize: pageSize}, "获取成功")
}

func (h *Announcement) DataSource(c *gin.Context) {
	users, err := h.service.UserOptions(c.Request.Context())
	if err != nil {
		httpx.Fail(c, "查询失败")
		return
	}
	httpx.OKWithData(c, gin.H{"userID": users})
}

func (h *Announcement) Public(c *gin.Context) {
	httpx.Write(c, httpx.CodeSuccess, gin.H{"info": "不需要鉴权的公告接口信息"}, "获取成功")
}

func parseTime(value string) (*time.Time, error) {
	if value == "" {
		return nil, nil
	}
	parsed, err := time.Parse(time.RFC3339, value)
	if err != nil {
		return nil, err
	}
	return &parsed, nil
}