package handler

import (
	"net/http"
	"os"
	"path/filepath"

	"bj_power_mes/common/httpx"
	"bj_power_mes/internal/logic"
	"bj_power_mes/internal/svc"
)

// AttachmentUploadHandler POST /attachment/upload 上传并登记（multipart: bizType,bizId,file）
func AttachmentUploadHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if err := r.ParseMultipartForm(32 << 20); err != nil {
			httpx.BadRequest(w, "表单解析失败")
			return
		}
		bizType := r.FormValue("bizType")
		bizId := r.FormValue("bizId")
		if bizType == "" || bizId == "" {
			httpx.BadRequest(w, "bizType 与 bizId 必填")
			return
		}
		rel, fname, size, err := saveUploadFileFull(r, "file", svcCtx.Config.Upload.Dir)
		if err != nil {
			httpx.Fail(w, 3311, "文件保存失败："+err.Error())
			return
		}
		rec, err := logic.New(svcCtx).AddAttachment(r.Context(), bizType, bizId, fname, rel, int(size), operator(r, ""))
		if err != nil {
			httpx.Fail(w, 3311, err.Error())
			return
		}
		httpx.Ok(w, rec)
	}
}

// AttachmentListHandler GET /attachments?bizType=&bizId= 附件列表
func AttachmentListHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		q := r.URL.Query()
		data, err := logic.New(svcCtx).ListAttachments(r.Context(), q.Get("bizType"), q.Get("bizId"))
		if err != nil {
			httpx.Fail(w, 3312, err.Error())
			return
		}
		httpx.Ok(w, data)
	}
}

// AttachmentDownloadHandler GET /attachment/download?name= 下载
func AttachmentDownloadHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		name := r.URL.Query().Get("name")
		if name == "" {
			httpx.BadRequest(w, "缺少 name")
			return
		}
		serveUploadFile(w, r, svcCtx.Config.Upload.Dir, name)
	}
}

// AttachmentDeleteHandler POST /attachment/delete {id} 删除（记录+物理文件）
func AttachmentDeleteHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			Id int `json:"id"`
		}
		if err := httpx.ParseJSON(r, &req); err != nil {
			httpx.BadRequest(w, "请求体解析失败")
			return
		}
		att, err := logic.New(svcCtx).DeleteAttachment(r.Context(), req.Id)
		if err != nil {
			httpx.Fail(w, 3313, err.Error())
			return
		}
		full := filepath.Join(svcCtx.Config.Upload.Dir, filepath.FromSlash(att.FilePath))
		_ = os.Remove(full)
		httpx.OkMessage(w, "删除成功", nil)
	}
}