package handler

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

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

type SchoolHandler struct {
	svc *service.SchoolService
}

func NewSchoolHandler(svc *service.SchoolService) *SchoolHandler {
	return &SchoolHandler{svc: svc}
}

// List GET /api/schools or /api/admin/schools
func (h *SchoolHandler) List(c *gin.Context) {
	var q service.SchoolQuery
	if err := c.ShouldBindQuery(&q); err != nil {
		response.BadRequest(c, "参数错误")
		return
	}
	result, err := h.svc.List(&q)
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, result)
}

// Stats GET /api/admin/schools/stats
func (h *SchoolHandler) Stats(c *gin.Context) {
	stats, err := h.svc.Stats()
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, stats)
}

// Create POST /api/schools or /api/admin/schools
func (h *SchoolHandler) Create(c *gin.Context) {
	var body struct {
		RegionID    uint               `json:"region_id"`
		Name        string             `json:"name"`
		NameEn      string             `json:"name_en"`
		SchoolType  model.SchoolType   `json:"school_type"`  // 兼容旧的单选提交
		SchoolTypes []string           `json:"school_types"` // 新的多选提交
		Address     string             `json:"address"`
		Status      model.SchoolStatus `json:"status"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.BadRequest(c, "参数错误")
		return
	}
	types := model.NormalizeSchoolTypes(body.SchoolTypes)
	if len(types) == 0 && body.SchoolType != "" {
		types = model.NormalizeSchoolTypes([]string{string(body.SchoolType)})
	}
	if len(types) == 0 {
		response.BadRequest(c, "请选择学校类型")
		return
	}
	school := model.School{
		RegionID:    body.RegionID,
		Name:        strings.TrimSpace(body.Name),
		NameEn:      strings.TrimSpace(body.NameEn),
		SchoolType:  types[0],
		SchoolTypes: model.JoinSchoolTypes(types),
		Address:     strings.TrimSpace(body.Address),
		Status:      body.Status,
	}
	if uid := middleware.CurrentUserID(c); uid > 0 {
		school.CreatedBy = uid
	}
	if err := h.svc.Create(&school); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.Created(c, school)
}

// Get GET /api/schools/:id
func (h *SchoolHandler) Get(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	school, err := h.svc.GetByID(uint(id))
	if err != nil {
		response.NotFound(c, err.Error())
		return
	}
	// 附带学院列表
	colleges, _ := h.svc.ListColleges(uint(id))
	response.OK(c, gin.H{"school": school, "colleges": colleges})
}

// Update PUT /api/schools/:id
func (h *SchoolHandler) Update(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	var body map[string]interface{}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.BadRequest(c, "参数错误")
		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
	}
	// 多学段：优先取数组形式的 school_types
	if v, ok := body["school_types"]; ok {
		switch raw := v.(type) {
		case []interface{}:
			items := make([]string, 0, len(raw))
			for _, item := range raw {
				if s, ok := item.(string); ok {
					items = append(items, s)
				}
			}
			updates["school_types"] = model.JoinSchoolTypes(model.NormalizeSchoolTypes(items))
		case string:
			updates["school_types"] = raw
		}
	} else if v, ok := body["school_type"]; ok {
		// 兼容旧的单选提交：同步写入两个字段
		if s, ok := v.(string); ok {
			updates["school_types"] = s
		}
	}
	if v, ok := body["address"]; ok {
		updates["address"] = v
	}
	if v, ok := body["region_id"]; ok {
		updates["region_id"] = v
	}
	if v, ok := body["status"]; ok {
		updates["status"] = v
	}
	if v, ok := body["reject_reason"]; ok {
		updates["reject_reason"] = 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"})
}

// Approve POST /api/admin/schools/:id/approve
func (h *SchoolHandler) Approve(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		response.BadRequest(c, "无效的学校ID")
		return
	}
	if err := h.svc.Approve(uint(id)); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "审核通过"})
}

// Reject POST /api/admin/schools/:id/reject
func (h *SchoolHandler) Reject(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		response.BadRequest(c, "无效的学校ID")
		return
	}
	var body struct {
		Reason string `json:"reason" binding:"required"`
	}
	if err := c.ShouldBindJSON(&body); err != nil || strings.TrimSpace(body.Reason) == "" {
		response.BadRequest(c, "请输入打回原因")
		return
	}
	if err := h.svc.Reject(uint(id), strings.TrimSpace(body.Reason)); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "打回成功"})
}

// Delete DELETE /api/schools/:id
func (h *SchoolHandler) Delete(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	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"})
}

// ---- 学院 ----

// ListColleges GET /api/schools/:id/colleges
func (h *SchoolHandler) ListColleges(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	list, err := h.svc.ListColleges(uint(id))
	if err != nil {
		response.Internal(c, err.Error())
		return
	}
	response.OK(c, list)
}

// CreateCollege POST /api/schools/:id/colleges
func (h *SchoolHandler) CreateCollege(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	var body struct {
		Name string `json:"name" binding:"required"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.BadRequest(c, "学院名称不能为空")
		return
	}
	college, err := h.svc.CreateCollege(uint(id), body.Name)
	if err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.Created(c, college)
}

// UpdateCollege PUT /api/colleges/:id
func (h *SchoolHandler) UpdateCollege(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	var body struct {
		Name string `json:"name" binding:"required"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		response.BadRequest(c, "学院名称不能为空")
		return
	}
	if err := h.svc.UpdateCollege(uint(id), body.Name); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "更新成功"})
}

// DeleteCollege DELETE /api/colleges/:id
func (h *SchoolHandler) DeleteCollege(c *gin.Context) {
	id, _ := strconv.ParseUint(c.Param("id"), 10, 64)
	if err := h.svc.DeleteCollege(uint(id)); err != nil {
		response.BadRequest(c, err.Error())
		return
	}
	response.OK(c, gin.H{"message": "删除成功"})
}