Move some repository related code into sub package (#19711)

* Move some repository related code into sub package

* Move more repository functions out of models

* Fix lint

* Some performance optimization for webhooks and others

* some refactors

* Fix lint

* Fix

* Update modules/repository/delete.go

Co-authored-by: delvh <dev.lh@web.de>

* Fix test

* Merge

* Fix test

* Fix test

* Fix test

* Fix test

Co-authored-by: delvh <dev.lh@web.de>

models/repo/user_repo_test.go

@@ -0,0 +1,74 @@
+// Copyright 2017 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_test
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRepoAssignees(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	repo2 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 2}).(*repo_model.Repository)
+	users, err := repo_model.GetRepoAssignees(db.DefaultContext, repo2)
+	assert.NoError(t, err)
+	assert.Len(t, users, 1)
+	assert.Equal(t, users[0].ID, int64(2))
+
+	repo21 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 21}).(*repo_model.Repository)
+	users, err = repo_model.GetRepoAssignees(db.DefaultContext, repo21)
+	assert.NoError(t, err)
+	assert.Len(t, users, 3)
+	assert.Equal(t, users[0].ID, int64(15))
+	assert.Equal(t, users[1].ID, int64(18))
+	assert.Equal(t, users[2].ID, int64(16))
+}
+
+func TestRepoGetReviewers(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	// test public repo
+	repo1 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1}).(*repo_model.Repository)
+
+	ctx := db.DefaultContext
+	reviewers, err := repo_model.GetReviewers(ctx, repo1, 2, 2)
+	assert.NoError(t, err)
+	assert.Len(t, reviewers, 4)
+
+	// should include doer if doer is not PR poster.
+	reviewers, err = repo_model.GetReviewers(ctx, repo1, 11, 2)
+	assert.NoError(t, err)
+	assert.Len(t, reviewers, 4)
+
+	// should not include PR poster, if PR poster would be otherwise eligible
+	reviewers, err = repo_model.GetReviewers(ctx, repo1, 11, 4)
+	assert.NoError(t, err)
+	assert.Len(t, reviewers, 3)
+
+	// test private user repo
+	repo2 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 2}).(*repo_model.Repository)
+
+	reviewers, err = repo_model.GetReviewers(ctx, repo2, 2, 4)
+	assert.NoError(t, err)
+	assert.Len(t, reviewers, 1)
+	assert.EqualValues(t, reviewers[0].ID, 2)
+
+	// test private org repo
+	repo3 := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 3}).(*repo_model.Repository)
+
+	reviewers, err = repo_model.GetReviewers(ctx, repo3, 2, 1)
+	assert.NoError(t, err)
+	assert.Len(t, reviewers, 2)
+
+	reviewers, err = repo_model.GetReviewers(ctx, repo3, 2, 2)
+	assert.NoError(t, err)
+	assert.Len(t, reviewers, 1)
+}