Move project files into models/project sub package (#17704)

* Move project files into models/project sub package

* Fix test

* Fix test

* Fix test

* Fix build

* Fix test

* Fix template bug

* Fix bug

* Fix lint

* Fix test

* Fix import

* Improve codes

Co-authored-by: 6543 <6543@obermui.de>

models/project/issue.go

@@ -0,0 +1,100 @@
+// Copyright 2020 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 project
+
+import (
+	"context"
+	"fmt"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+// ProjectIssue saves relation from issue to a project
+type ProjectIssue struct { //revive:disable-line:exported
+	ID        int64 `xorm:"pk autoincr"`
+	IssueID   int64 `xorm:"INDEX"`
+	ProjectID int64 `xorm:"INDEX"`
+
+	// If 0, then it has not been added to a specific board in the project
+	ProjectBoardID int64 `xorm:"INDEX"`
+}
+
+func init() {
+	db.RegisterModel(new(ProjectIssue))
+}
+
+func deleteProjectIssuesByProjectID(e db.Engine, projectID int64) error {
+	_, err := e.Where("project_id=?", projectID).Delete(&ProjectIssue{})
+	return err
+}
+
+// NumIssues return counter of all issues assigned to a project
+func (p *Project) NumIssues() int {
+	c, err := db.GetEngine(db.DefaultContext).Table("project_issue").
+		Where("project_id=?", p.ID).
+		GroupBy("issue_id").
+		Cols("issue_id").
+		Count()
+	if err != nil {
+		return 0
+	}
+	return int(c)
+}
+
+// NumClosedIssues return counter of closed issues assigned to a project
+func (p *Project) NumClosedIssues() int {
+	c, err := db.GetEngine(db.DefaultContext).Table("project_issue").
+		Join("INNER", "issue", "project_issue.issue_id=issue.id").
+		Where("project_issue.project_id=? AND issue.is_closed=?", p.ID, true).
+		Cols("issue_id").
+		Count()
+	if err != nil {
+		return 0
+	}
+	return int(c)
+}
+
+// NumOpenIssues return counter of open issues assigned to a project
+func (p *Project) NumOpenIssues() int {
+	c, err := db.GetEngine(db.DefaultContext).Table("project_issue").
+		Join("INNER", "issue", "project_issue.issue_id=issue.id").
+		Where("project_issue.project_id=? AND issue.is_closed=?", p.ID, false).Count("issue.id")
+	if err != nil {
+		return 0
+	}
+	return int(c)
+}
+
+// MoveIssuesOnProjectBoard moves or keeps issues in a column and sorts them inside that column
+func MoveIssuesOnProjectBoard(board *Board, sortedIssueIDs map[int64]int64) error {
+	return db.WithTx(func(ctx context.Context) error {
+		sess := db.GetEngine(ctx)
+
+		issueIDs := make([]int64, 0, len(sortedIssueIDs))
+		for _, issueID := range sortedIssueIDs {
+			issueIDs = append(issueIDs, issueID)
+		}
+		count, err := sess.Table(new(ProjectIssue)).Where("project_id=?", board.ProjectID).In("issue_id", issueIDs).Count()
+		if err != nil {
+			return err
+		}
+		if int(count) != len(sortedIssueIDs) {
+			return fmt.Errorf("all issues have to be added to a project first")
+		}
+
+		for sorting, issueID := range sortedIssueIDs {
+			_, err = sess.Exec("UPDATE `project_issue` SET project_board_id=?, sorting=? WHERE issue_id=?", board.ID, sorting, issueID)
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}
+
+func (pb *Board) removeIssues(e db.Engine) error {
+	_, err := e.Exec("UPDATE `project_issue` SET project_board_id = 0 WHERE project_board_id = ? ", pb.ID)
+	return err
+}