// Copyright 2022 Harness Inc. All rights reserved.
// Use of this source code is governed by the Polyform Free Trial License
// that can be found in the LICENSE.md file for this repository.

package pullreq

import (
	"encoding/json"
	"errors"
	"io"
	"net/http"

	"github.com/harness/gitness/internal/api/controller/pullreq"
	"github.com/harness/gitness/internal/api/render"
	"github.com/harness/gitness/internal/api/request"
)

// HandleCreate returns a http.HandlerFunc that creates a new pull request.
func HandleMerge(pullreqCtrl *pullreq.Controller) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		ctx := r.Context()
		session, _ := request.AuthSessionFrom(ctx)

		repoRef, err := request.GetRepoRefFromPath(r)
		if err != nil {
			render.TranslatedUserError(w, err)
			return
		}

		in := new(pullreq.MergeInput)
		err = json.NewDecoder(r.Body).Decode(in)
		if err != nil && !errors.Is(err, io.EOF) { // allow empty body
			render.BadRequestf(w, "Invalid Request Body: %s.", err)
			return
		}

		pullreqNumber, err := request.GetPullReqNumberFromPath(r)
		if err != nil {
			render.TranslatedUserError(w, err)
			return
		}

		pr, err := pullreqCtrl.Merge(ctx, session, repoRef, pullreqNumber, in)
		if err != nil {
			render.TranslatedUserError(w, err)
			return
		}

		render.JSON(w, http.StatusOK, pr)
	}
}