// Copyright 2018-2022 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package repo

import (
	"net/http"

	"code.gitea.io/gitea/models"
	"code.gitea.io/gitea/modules/context"
	"code.gitea.io/gitea/modules/setting"
)

// AddParent adds new parents
func AddParent(ctx *context.Context) {
	issueIndex := ctx.ParamsInt64("index")
	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, issueIndex)
	if err != nil {
		ctx.ServerError("GetIssueByIndex", err)
		return
	}

	// Check if the Repo is allowed to have parents
	if !ctx.Repo.CanCreateIssueParents(ctx.User, issue.IsPull) {
		ctx.Error(http.StatusForbidden, "CanCreateIssueParents")
		return
	}

	parentID := ctx.FormInt64("newParent")

	if err = issue.LoadRepo(); err != nil {
		ctx.ServerError("LoadRepo", err)
		return
	}

	// Redirect
	defer ctx.Redirect(issue.HTMLURL(), http.StatusSeeOther)

	// Parent
	parent, err := models.GetIssueByID(parentID)
	if err != nil {
		ctx.Flash.Error(ctx.Tr("repo.issues.parent.add_error_dep_issue_not_exist"))
		return
	}

	// Check if both issues are in the same repo if cross repository parents is not enabled
	if issue.RepoID != parent.RepoID && !setting.Service.AllowCrossRepositoryParents {
		ctx.Flash.Error(ctx.Tr("repo.issues.parent.add_error_dep_not_same_repo"))
		return
	}

	// Check if issue and parent is the same
	if parent.ID == issue.ID {
		ctx.Flash.Error(ctx.Tr("repo.issues.parent.add_error_same_issue"))
		return
	}

	err = models.CreateIssueParent(ctx.User, issue, parent)
	if err != nil {
		if models.IsErrParentExists(err) {
			ctx.Flash.Error(ctx.Tr("repo.issues.parent.add_error_dep_exists"))
			return
		} else if models.IsErrCircularParent(err) {
			ctx.Flash.Error(ctx.Tr("repo.issues.parent.add_error_cannot_create_circular"))
			return
		} else {
			ctx.ServerError("CreateOrUpdateIssueParent", err)
			return
		}
	}
}

// RemoveParent removes the parent
func RemoveParent(ctx *context.Context) {
	issueIndex := ctx.ParamsInt64("index")
	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, issueIndex)
	if err != nil {
		ctx.ServerError("GetIssueByIndex", err)
		return
	}

	// Check if the Repo is allowed to have dependencies
	if !ctx.Repo.CanCreateIssueParents(ctx.User, issue.IsPull) {
		ctx.Error(http.StatusForbidden, "CanCreateIssueParents")
		return
	}

	parentID := ctx.FormInt64("removeParentID")

	if err = issue.LoadRepo(); err != nil {
		ctx.ServerError("LoadRepo", err)
		return
	}

	// Parent Type
	parentTypeStr := ctx.Req.PostForm.Get("parentType")

	var parentType models.ParentType

	switch parentTypeStr {
	case "father":
		parentType = models.ParentTypeFather
	case "child":
		parentType = models.ParentTypeChild
	default:
		ctx.Error(http.StatusBadRequest, "GetParentType")
		return
	}

	// Parent
	parent, err := models.GetIssueByID(parentID)
	if err != nil {
		ctx.ServerError("GetIssueByID", err)
		return
	}

	if err = models.RemoveIssueParent(ctx.User, issue, parent, parentType); err != nil {
		if models.IsErrParentNotExists(err) {
			ctx.Flash.Error(ctx.Tr("repo.issues.parent.add_error_dep_not_exist"))
			return
		}
		ctx.ServerError("RemoveIssueParent", err)
		return
	}

	// Redirect
	ctx.Redirect(issue.HTMLURL(), http.StatusSeeOther)
}