package csmanualentry

import (
	"errors"
	"net/http"
	"strconv"
	"strings"

	"hfb_sys/backend/internal/middleware"
	"hfb_sys/backend/pkg/response"

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

type Handler struct {
	service *Service
}

func NewHandler(service *Service) *Handler {
	return &Handler{service: service}
}

func (h *Handler) Create(c *gin.Context) {
	adminID, ok := currentAdminID(c)
	if !ok {
		response.Unauthorized(c, "缺少管理员上下文")
		return
	}
	var req CreateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "录单参数不正确")
		return
	}
	result, err := h.service.Create(c.Request.Context(), adminID, req)
	if err != nil {
		writeManualEntryError(c, err)
		return
	}
	response.Created(c, result)
}

func (h *Handler) List(c *gin.Context) {
	if _, ok := currentAdminID(c); !ok {
		response.Unauthorized(c, "缺少管理员上下文")
		return
	}
	page, pageSize := parsePagination(c)
	query := ListQuery{
		EntryNo:   strings.TrimSpace(c.Query("entry_no")),
		Keyword:   strings.TrimSpace(c.Query("keyword")),
		StartDate: strings.TrimSpace(c.Query("start_date")),
		EndDate:   strings.TrimSpace(c.Query("end_date")),
		Page:      page,
		PageSize:  pageSize,
	}
	if raw := c.Query("admin_id"); raw != "" {
		adminID, err := strconv.ParseUint(raw, 10, 64)
		if err != nil {
			response.BadRequest(c, "客服 ID 不正确")
			return
		}
		query.AdminID = adminID
	}
	result, err := h.service.List(c.Request.Context(), query)
	if err != nil {
		writeManualEntryError(c, err)
		return
	}
	response.OK(c, result)
}

func (h *Handler) TodayAgentStats(c *gin.Context) {
	if _, ok := currentAdminID(c); !ok {
		response.Unauthorized(c, "缺少管理员上下文")
		return
	}
	items, err := h.service.TodayAgentStats(c.Request.Context())
	if err != nil {
		writeManualEntryError(c, err)
		return
	}
	response.OK(c, items)
}

func (h *Handler) Update(c *gin.Context) {
	if _, ok := currentAdminID(c); !ok {
		response.Unauthorized(c, "缺少管理员上下文")
		return
	}
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		response.BadRequest(c, "ID 不正确")
		return
	}
	var req UpdateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "录单参数不正确")
		return
	}
	entry, err := h.service.Update(c.Request.Context(), id, req)
	if err != nil {
		writeManualEntryError(c, err)
		return
	}
	response.OK(c, entry)
}

func (h *Handler) Delete(c *gin.Context) {
	if _, ok := currentAdminID(c); !ok {
		response.Unauthorized(c, "缺少管理员上下文")
		return
	}
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		response.BadRequest(c, "ID 不正确")
		return
	}
	if err := h.service.Delete(c.Request.Context(), id); err != nil {
		writeManualEntryError(c, err)
		return
	}
	response.OK(c, gin.H{"deleted": true})
}

func currentAdminID(c *gin.Context) (uint64, bool) {
	value, ok := c.Get(middleware.ContextAdminID)
	if !ok {
		return 0, false
	}
	adminID, ok := value.(uint64)
	return adminID, ok
}

func parsePagination(c *gin.Context) (int, int) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
	if page < 1 {
		page = 1
	}
	if pageSize < 1 {
		pageSize = 20
	}
	if pageSize > 100 {
		pageSize = 100
	}
	return page, pageSize
}

func writeManualEntryError(c *gin.Context, err error) {
	response.RecordError(c, err)
	switch {
	case errors.Is(err, ErrDependencyUnavailable):
		response.ServiceUnavailable(c, "数据库未连接")
	case errors.Is(err, ErrAdminNotFound):
		response.Unauthorized(c, "客服账号不存在")
	case errors.Is(err, ErrEntryNoInvalid):
		response.BadRequest(c, "编号格式不正确")
	case errors.Is(err, ErrEntryNotFound):
		response.NotFound(c, "录单记录不存在")
	case errors.Is(err, ErrEntryNoExists):
		response.Error(c, http.StatusConflict, "entry_no_exists", "该编号已被登记")
	default:
		response.Error(c, http.StatusInternalServerError, "internal_error", "录单服务暂时不可用")
	}
}