package system

import (
	"fmt"
	"net/http"
	"strings"

	"management/internal/db/model/dto"
	db "management/internal/db/sqlc"
	"management/internal/erpserver/biz"
	"management/internal/pkg/convertor"
	"management/internal/pkg/tpl"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgtype"
)

type CategoryHandler interface {
	List(w http.ResponseWriter, r *http.Request)
	Add(w http.ResponseWriter, r *http.Request)
	AddChildren(w http.ResponseWriter, r *http.Request)
	Edit(w http.ResponseWriter, r *http.Request)
	Save(w http.ResponseWriter, r *http.Request)
	Data(w http.ResponseWriter, r *http.Request)
	Refresh(w http.ResponseWriter, r *http.Request)
	RebuildParentPath(w http.ResponseWriter, r *http.Request)
}

type categoryHandler struct {
	render tpl.Renderer
	biz    biz.IBiz
}

var _ CategoryHandler = (*categoryHandler)(nil)

func NewCategoryHandler(render tpl.Renderer, biz biz.IBiz) *categoryHandler {
	return &categoryHandler{
		render: render,
		biz:    biz,
	}
}

func (h *categoryHandler) List(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		h.render.HTML(w, r, "category/list.tmpl", nil)
	case http.MethodPost:
		var q dto.SearchDto
		q.SearchStatus = convertor.ConvertInt(r.PostFormValue("status"), 9999)
		q.SearchParentID = convertor.ConvertInt(r.PostFormValue("parentId"), 0)
		q.SearchName = r.PostFormValue("name")
		q.SearchID = convertor.ConvertInt[int64](r.PostFormValue("id"), 0)
		q.Page = convertor.ConvertInt(r.PostFormValue("page"), 1)
		q.Rows = convertor.ConvertInt(r.PostFormValue("rows"), 10)
		res, count, err := h.biz.SystemV1().CategoryBiz().List(r.Context(), q)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		data := tpl.ResponseList{
			Code:    0,
			Message: "ok",
			Count:   count,
			Data:    res,
		}
		h.render.JSON(w, data)
	default:
		http.Error(w, "Method Not Allowed", http.StatusMethodNotAllowed)
	}
}

func (h *categoryHandler) Add(w http.ResponseWriter, r *http.Request) {
	h.render.HTML(w, r, "category/edit.tmpl", map[string]any{
		"Item": &db.Category{Sort: 6666},
	})
}

func (h *categoryHandler) AddChildren(w http.ResponseWriter, r *http.Request) {
	vars := r.URL.Query()
	parentID := convertor.QueryInt[int32](vars, "parentID", 0)
	vm := &db.Category{ParentID: parentID, Sort: 6666}
	h.render.HTML(w, r, "category/edit.tmpl", map[string]any{
		"Item": vm,
	})
}

func (h *categoryHandler) Edit(w http.ResponseWriter, r *http.Request) {
	vars := r.URL.Query()
	id := convertor.QueryInt[int32](vars, "id", 0)
	vm := &db.Category{Sort: 6666}
	if id > 0 {
		vm, _ = h.biz.SystemV1().CategoryBiz().Get(r.Context(), id)
	}
	h.render.HTML(w, r, "category/edit.tmpl", map[string]any{
		"Item": vm,
	})
}

func (h *categoryHandler) Save(w http.ResponseWriter, r *http.Request) {
	id := convertor.ConvertInt(r.PostFormValue("ID"), 0)
	parentID := convertor.ConvertInt[int32](r.PostFormValue("ParentID"), 0)
	name := r.PostFormValue("Name")
	icon := r.PostFormValue("File")
	if len(icon) > 0 && !strings.HasPrefix(icon, "/") {
		icon = "/" + icon
	}
	description := r.PostFormValue("Description")
	letter := r.PostFormValue("Letter")
	if len(letter) == 0 {
		letter = uuid.New().String()
	}
	sort := convertor.ConvertInt[int32](r.PostFormValue("Sort"), 6666)
	status := convertor.ConvertInt[int16](r.PostFormValue("Status"), 9999)

	ctx := r.Context()
	var parent *db.Category
	if parentID > 0 {
		var err error
		parent, err = h.biz.SystemV1().CategoryBiz().Get(ctx, parentID)
		if err != nil {
			h.render.JSONERR(w, "父级节点错误")
			return
		}
	}

	path := fmt.Sprintf("%s,%d,", parent.ParentPath, parent.ID)
	path = strings.ReplaceAll(path, ",,", ",")
	if id == 0 {
		arg := &db.CreateCategoryParams{
			Name:        name,
			Icon:        icon,
			Description: description,
			Letter:      letter,
			ParentID:    parentID,
			ParentPath:  path,
			Status:      status,
			Sort:        sort,
		}
		_, err := h.biz.SystemV1().CategoryBiz().Create(ctx, arg)
		if err != nil {
			if db.IsUniqueViolation(err) {
				h.render.JSONERR(w, "名称已存在")
				return
			}
			h.render.JSONERR(w, err.Error())
			return
		}

		h.render.JSONOK(w, "添加成功")
	} else {
		arg := &db.UpdateCategoryParams{
			ID: int32(id),
			Name: pgtype.Text{
				String: name,
				Valid:  true,
			},
			Icon: pgtype.Text{
				String: icon,
				Valid:  len(icon) > 0,
			},
			Description: pgtype.Text{
				String: description,
				Valid:  len(description) > 0,
			},
			Letter: pgtype.Text{
				String: letter,
				Valid:  len(letter) > 0,
			},
			ParentID: pgtype.Int4{
				Int32: parentID,
				Valid: true,
			},
			ParentPath: pgtype.Text{
				String: path,
				Valid:  true,
			},
			Sort: pgtype.Int4{
				Int32: sort,
				Valid: true,
			},
			Status: pgtype.Int2{
				Int16: status,
				Valid: true,
			},
		}
		_, err := h.biz.SystemV1().CategoryBiz().Update(ctx, arg)
		if err != nil {
			h.render.JSONERR(w, err.Error())
			return
		}

		h.render.JSONOK(w, "更新成功")
	}
}

func (h *categoryHandler) Data(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	vars := r.URL.Query()
	t := vars.Get("type")
	if t == "tree" {
		res, err := h.biz.SystemV1().CategoryBiz().Tree(ctx, 0)
		if err != nil {
			h.render.JSONERR(w, err.Error())
			return
		}

		h.render.JSON(w, res)
		return
	} else if t == "xmselect_tree" {
		res, err := h.biz.SystemV1().CategoryBiz().XmSelectTree(ctx, 0)
		if err != nil {
			h.render.JSONERR(w, err.Error())
			return
		}

		h.render.JSON(w, res)
		return
	} else if t == "xmselect" {
		res, err := h.biz.SystemV1().CategoryBiz().XmSelect(ctx, vars.Get("letter"))
		if err != nil {
			h.render.JSONERR(w, err.Error())
			return
		}

		h.render.JSON(w, res)
		return
	}
}

func (h *categoryHandler) Refresh(w http.ResponseWriter, r *http.Request) {
	_, err := h.biz.SystemV1().CategoryBiz().Refresh(r.Context())
	if err != nil {
		h.render.JSONERR(w, err.Error())
		return
	}

	h.render.JSONOK(w, "刷新成功")
}

func (h *categoryHandler) RebuildParentPath(w http.ResponseWriter, r *http.Request) {
	err := h.biz.SystemV1().CategoryBiz().RebuildParentPath(r.Context())
	if err != nil {
		h.render.JSONERR(w, err.Error())
		return
	}

	h.render.JSONOK(w, "重建成功")
}