// Code scaffolded by goctl. Safe to edit.
// goctl 1.10.1

package handler

import (
	"encoding/json"
	"fmt"
	"net/http"

	"github.com/zeromicro/go-zero/rest/httpx"
	"img_infinite_canvas/internal/logic"
	"img_infinite_canvas/internal/svc"
	"img_infinite_canvas/internal/types"
)

func projectEventsHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req types.ProjectIdRequest
		if err := httpx.Parse(r, &req); err != nil {
			httpx.ErrorCtx(r.Context(), w, err)
			return
		}
		flusher, ok := w.(http.Flusher)
		if !ok {
			httpx.ErrorCtx(r.Context(), w, fmt.Errorf("streaming is not supported"))
			return
		}

		header := w.Header()
		header.Set("Content-Type", "text/event-stream")
		header.Set("Cache-Control", "no-cache")
		header.Set("Connection", "keep-alive")
		header.Set("X-Accel-Buffering", "no")

		l := logic.NewProjectEventsLogic(r.Context(), svcCtx)
		threadID := r.URL.Query().Get("threadId")
		if threadID == "" {
			threadID = r.URL.Query().Get("thread_id")
		}
		err := l.Stream(&req, threadID, func(event string, payload any) error {
			data, err := json.Marshal(payload)
			if err != nil {
				return err
			}
			if _, err := fmt.Fprintf(w, "event: %s\ndata: %s\n\n", event, data); err != nil {
				return err
			}
			flusher.Flush()
			return nil
		})
		if err != nil && r.Context().Err() == nil {
			data, _ := json.Marshal(map[string]string{"error": err.Error()})
			_, _ = fmt.Fprintf(w, "event: stream_error\ndata: %s\n\n", data)
			flusher.Flush()
		}
	}
}