Move issues related files into models/issues (#19931)

* Move access and repo permission to models/perm/access

* fix test

* fix git test

* Move functions sequence

* Some improvements per @KN4CK3R and @delvh

* Move issues related code to models/issues

* Move some issues related sub package

* Merge

* Fix test

* Fix test

* Fix test

* Fix test

* Rename some files

models/issues/issue_project.go

@@ -0,0 +1,179 @@
+// Copyright 2021 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 issues
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/db"
+	project_model "code.gitea.io/gitea/models/project"
+	user_model "code.gitea.io/gitea/models/user"
+)
+
+// LoadProject load the project the issue was assigned to
+func (i *Issue) LoadProject() (err error) {
+	return i.loadProject(db.DefaultContext)
+}
+
+func (i *Issue) loadProject(ctx context.Context) (err error) {
+	if i.Project == nil {
+		var p project_model.Project
+		if _, err = db.GetEngine(ctx).Table("project").
+			Join("INNER", "project_issue", "project.id=project_issue.project_id").
+			Where("project_issue.issue_id = ?", i.ID).
+			Get(&p); err != nil {
+			return err
+		}
+		i.Project = &p
+	}
+	return
+}
+
+// ProjectID return project id if issue was assigned to one
+func (i *Issue) ProjectID() int64 {
+	return i.projectID(db.DefaultContext)
+}
+
+func (i *Issue) projectID(ctx context.Context) int64 {
+	var ip project_model.ProjectIssue
+	has, err := db.GetEngine(ctx).Where("issue_id=?", i.ID).Get(&ip)
+	if err != nil || !has {
+		return 0
+	}
+	return ip.ProjectID
+}
+
+// ProjectBoardID return project board id if issue was assigned to one
+func (i *Issue) ProjectBoardID() int64 {
+	return i.projectBoardID(db.DefaultContext)
+}
+
+func (i *Issue) projectBoardID(ctx context.Context) int64 {
+	var ip project_model.ProjectIssue
+	has, err := db.GetEngine(ctx).Where("issue_id=?", i.ID).Get(&ip)
+	if err != nil || !has {
+		return 0
+	}
+	return ip.ProjectBoardID
+}
+
+// LoadIssuesFromBoard load issues assigned to this board
+func LoadIssuesFromBoard(b *project_model.Board) (IssueList, error) {
+	issueList := make([]*Issue, 0, 10)
+
+	if b.ID != 0 {
+		issues, err := Issues(&IssuesOptions{
+			ProjectBoardID: b.ID,
+			ProjectID:      b.ProjectID,
+		})
+		if err != nil {
+			return nil, err
+		}
+		issueList = issues
+	}
+
+	if b.Default {
+		issues, err := Issues(&IssuesOptions{
+			ProjectBoardID: -1, // Issues without ProjectBoardID
+			ProjectID:      b.ProjectID,
+		})
+		if err != nil {
+			return nil, err
+		}
+		issueList = append(issueList, issues...)
+	}
+
+	if err := IssueList(issueList).LoadComments(); err != nil {
+		return nil, err
+	}
+
+	return issueList, nil
+}
+
+// LoadIssuesFromBoardList load issues assigned to the boards
+func LoadIssuesFromBoardList(bs project_model.BoardList) (map[int64]IssueList, error) {
+	issuesMap := make(map[int64]IssueList, len(bs))
+	for i := range bs {
+		il, err := LoadIssuesFromBoard(bs[i])
+		if err != nil {
+			return nil, err
+		}
+		issuesMap[bs[i].ID] = il
+	}
+	return issuesMap, nil
+}
+
+// ChangeProjectAssign changes the project associated with an issue
+func ChangeProjectAssign(issue *Issue, doer *user_model.User, newProjectID int64) error {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	if err := addUpdateIssueProject(ctx, issue, doer, newProjectID); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}
+
+func addUpdateIssueProject(ctx context.Context, issue *Issue, doer *user_model.User, newProjectID int64) error {
+	oldProjectID := issue.projectID(ctx)
+
+	if _, err := db.GetEngine(ctx).Where("project_issue.issue_id=?", issue.ID).Delete(&project_model.ProjectIssue{}); err != nil {
+		return err
+	}
+
+	if err := issue.LoadRepo(ctx); err != nil {
+		return err
+	}
+
+	if oldProjectID > 0 || newProjectID > 0 {
+		if _, err := CreateCommentCtx(ctx, &CreateCommentOptions{
+			Type:         CommentTypeProject,
+			Doer:         doer,
+			Repo:         issue.Repo,
+			Issue:        issue,
+			OldProjectID: oldProjectID,
+			ProjectID:    newProjectID,
+		}); err != nil {
+			return err
+		}
+	}
+
+	return db.Insert(ctx, &project_model.ProjectIssue{
+		IssueID:   issue.ID,
+		ProjectID: newProjectID,
+	})
+}
+
+// MoveIssueAcrossProjectBoards move a card from one board to another
+func MoveIssueAcrossProjectBoards(issue *Issue, board *project_model.Board) error {
+	ctx, committer, err := db.TxContext()
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+	sess := db.GetEngine(ctx)
+
+	var pis project_model.ProjectIssue
+	has, err := sess.Where("issue_id=?", issue.ID).Get(&pis)
+	if err != nil {
+		return err
+	}
+
+	if !has {
+		return fmt.Errorf("issue has to be added to a project first")
+	}
+
+	pis.ProjectBoardID = board.ID
+	if _, err := sess.ID(pis.ID).Cols("project_board_id").Update(&pis); err != nil {
+		return err
+	}
+
+	return committer.Commit()
+}