package handler

import (
	"photowall/internal/model"
	"photowall/internal/service"
	"photowall/pkg/response"
	"strconv"

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

type RegionHandler struct {
	svc *service.RegionService
}

func NewRegionHandler(svc *service.RegionService) *RegionHandler {
	return &RegionHandler{svc: svc}
}

// List GET /api/regions?parent_id=0&level=city
func (h *RegionHandler) List(c *gin.Context) {
	parentID, _ := strconv.ParseUint(c.DefaultQuery("parent_id", "0"), 10, 64)
	level := c.Query("level")
	list, err := h.svc.ListByParent(uint(parentID), model.RegionLevel(level))
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, list)
}

// Countries GET /api/regions/countries
func (h *RegionHandler) Countries(c *gin.Context) {
	list, err := h.svc.ListCountries()
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, list)
}

// Path GET /api/regions/:id/path
func (h *RegionHandler) Path(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		response.BadRequest(c, "无效的地区ID")
		return
	}
	path, err := h.svc.GetPath(uint(id))
	if err != nil {
		response.NotFound(c, "地区不存在")
		return
	}
	response.OK(c, path)
}

// Search GET /api/regions/search?keyword=xxx
func (h *RegionHandler) Search(c *gin.Context) {
	keyword := c.Query("keyword")
	if keyword == "" {
		response.BadRequest(c, "请输入搜索关键词")
		return
	}
	list, err := h.svc.Search(keyword, 50)
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, list)
}

// Tree GET /api/admin/regions/tree
func (h *RegionHandler) Tree(c *gin.Context) {
	parentID, _ := strconv.ParseUint(c.DefaultQuery("parent_id", "0"), 10, 64)
	tree, err := h.svc.GetTree(uint(parentID))
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, tree)
}

// Create POST /api/admin/regions
func (h *RegionHandler) Create(c *gin.Context) {
	var r model.Region
	if err := c.ShouldBindJSON(&r); err != nil {
		response.BadRequest(c, "参数错误："+err.Error())
		return
	}
	if err := h.svc.Create(&r); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.Created(c, r)
}

// Update PUT /api/admin/regions/:id
func (h *RegionHandler) Update(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		response.BadRequest(c, "无效的地区ID")
		return
	}
	var body map[string]interface{}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.BadRequest(c, "参数错误："+err.Error())
		return
	}
	updates := map[string]interface{}{}
	if v, ok := body["name"]; ok {
		updates["name"] = v
	}
	if v, ok := body["name_en"]; ok {
		updates["name_en"] = v
	}
	if v, ok := body["level"]; ok {
		updates["level"] = v
	}
	if v, ok := body["code"]; ok {
		updates["code"] = v
	}
	if v, ok := body["sort_order"]; ok {
		updates["sort_order"] = v
	}
	if err := h.svc.Update(uint(id), updates); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "更新成功"})
}

// Delete DELETE /api/admin/regions/:id
func (h *RegionHandler) Delete(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		response.BadRequest(c, "无效的地区ID")
		return
	}
	if err := h.svc.Delete(uint(id)); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "删除成功"})
}

// InitChina POST /api/admin/regions/init-china
func (h *RegionHandler) InitChina(c *gin.Context) {
	created, total, err := h.svc.InitChinaRegions()
	if err != nil {
		response.Internal(c, "初始化失败: "+err.Error())
		return
	}
	response.OK(c, gin.H{
		"message":       "初始化中国行政区划成功",
		"created_count": created,
		"total_count":   total,
	})
}