package main

import (
	"fmt"
	"testing"

	"go.uber.org/mock/gomock"
	"src.opensuse.org/autogits/common"
	"src.opensuse.org/autogits/common/gitea-generated/models"
	mock_common "src.opensuse.org/autogits/common/mock"
)

func TestProcessPR(t *testing.T) {
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	mockGitea := mock_common.NewMockGitea(ctrl)
	groupName := "testgroup"

	bot := &ReviewBot{
		gitea:     mockGitea,
		groupName: groupName,
	}
	bot.InitRegex(groupName)

	org := "myorg"
	repo := "myrepo"
	prIndex := int64(1)
	headSha := "abcdef123456"

	pr := &models.PullRequest{
		Index: prIndex,
		URL:   "http://gitea/pr/1",
		State: "open",
		Base: &models.PRBranchInfo{
			Name: "main",
			Repo: &models.Repository{
				Name: repo,
				Owner: &models.User{
					UserName: org,
				},
			},
		},
		Head: &models.PRBranchInfo{
			Sha: headSha,
		},
		User: &models.User{
			UserName: "submitter",
		},
		RequestedReviewers: []*models.User{
			{UserName: groupName},
		},
	}

	prjConfig := &common.AutogitConfig{
		GitProjectName: org + "/" + repo + "#main",
		ReviewGroups: []*common.ReviewGroup{
			{
				Name:      groupName,
				Reviewers: []string{"reviewer1", "reviewer2"},
			},
		},
	}
	bot.configs = common.AutogitConfigs{prjConfig}

	t.Run("Review not requested for group", func(t *testing.T) {
		prNoRequest := *pr
		prNoRequest.RequestedReviewers = nil
		err := bot.ProcessPR(&prNoRequest)
		if err != nil {
			t.Errorf("Expected no error, got %v", err)
		}
	})

	t.Run("PR is closed", func(t *testing.T) {
		prClosed := *pr
		prClosed.State = "closed"
		err := bot.ProcessPR(&prClosed)
		if err != nil {
			t.Errorf("Expected no error, got %v", err)
		}
	})

	t.Run("Successful Approval", func(t *testing.T) {
		common.IsDryRun = false
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, nil)
		// reviewer1 approved in timeline
		timeline := []*models.TimelineComment{
			{
				Type: common.TimelineCommentType_Comment,
				User: &models.User{UserName: "reviewer1"},
				Body: "@" + groupName + ": approve",
			},
		}

		mockGitea.EXPECT().GetTimeline(org, repo, prIndex).Return(timeline, nil)

		expectedText := "reviewer1 approved a review on behalf of " + groupName
		mockGitea.EXPECT().AddReviewComment(pr, common.ReviewStateApproved, expectedText).Return(nil, nil)
		mockGitea.EXPECT().UnrequestReview(org, repo, prIndex, gomock.Any()).Return(nil)

		err := bot.ProcessPR(pr)
		if err != nil {
			t.Errorf("Expected nil error, got %v", err)
		}
	})

	t.Run("Dry Run - No actions taken", func(t *testing.T) {
		common.IsDryRun = true
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, nil)
		timeline := []*models.TimelineComment{
			{
				Type: common.TimelineCommentType_Comment,
				User: &models.User{UserName: "reviewer1"},
				Body: "@" + groupName + ": approve",
			},
		}
		mockGitea.EXPECT().GetTimeline(org, repo, prIndex).Return(timeline, nil)

		// No AddReviewComment or UnrequestReview should be called
		err := bot.ProcessPR(pr)
		if err != nil {
			t.Errorf("Expected nil error, got %v", err)
		}
	})

	t.Run("Approval already exists - No new comment", func(t *testing.T) {
		common.IsDryRun = false
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, nil)

		approvalText := "reviewer1 approved a review on behalf of " + groupName
		timeline := []*models.TimelineComment{
			{
				Type: common.TimelineCommentType_Review,
				User: &models.User{UserName: groupName},
				Body: approvalText,
			},
			{
				Type: common.TimelineCommentType_Comment,
				User: &models.User{UserName: "reviewer1"},
				Body: "@" + groupName + ": approve",
			},
			{
				Type: common.TimelineCommentType_Comment,
				User: &models.User{UserName: groupName},
				Body: "Help comment",
			},
		}

		mockGitea.EXPECT().GetTimeline(org, repo, prIndex).Return(timeline, nil)

		// No AddReviewComment, UnrequestReview, or AddComment should be called
		err := bot.ProcessPR(pr)
		if err != nil {
			t.Errorf("Expected nil error, got %v", err)
		}
	})

	t.Run("Rejection already exists - No new comment", func(t *testing.T) {
		common.IsDryRun = false
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, nil)

		rejectionText := "reviewer1 requested changes on behalf of " + groupName + ". See http://gitea/comment/123"
		timeline := []*models.TimelineComment{
			{
				Type: common.TimelineCommentType_Review,
				User: &models.User{UserName: groupName},
				Body: rejectionText,
			},
			{
				Type:    common.TimelineCommentType_Comment,
				User:    &models.User{UserName: "reviewer1"},
				Body:    "@" + groupName + ": decline",
				HTMLURL: "http://gitea/comment/123",
			},
			{
				Type: common.TimelineCommentType_Comment,
				User: &models.User{UserName: groupName},
				Body: "Help comment",
			},
		}

		mockGitea.EXPECT().GetTimeline(org, repo, prIndex).Return(timeline, nil)

		err := bot.ProcessPR(pr)
		if err != nil {
			t.Errorf("Expected nil error, got %v", err)
		}
	})

	t.Run("Pending review - Help comment already exists", func(t *testing.T) {
		common.IsDryRun = false
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, nil)

		timeline := []*models.TimelineComment{
			{
				Type: common.TimelineCommentType_Comment,
				User: &models.User{UserName: groupName},
				Body: "Some help comment",
			},
		}

		mockGitea.EXPECT().GetTimeline(org, repo, prIndex).Return(timeline, nil)

		// It will try to request reviews
		mockGitea.EXPECT().RequestReviews(pr, "reviewer1", "reviewer2").Return(nil, nil)

		// AddComment should NOT be called because bot already has a comment in timeline
		err := bot.ProcessPR(pr)
		if err != ReviewNotFinished {
			t.Errorf("Expected ReviewNotFinished error, got %v", err)
		}
	})

	t.Run("Submitter is group member - Excluded from review request", func(t *testing.T) {
		common.IsDryRun = false
		prSubmitterMember := *pr
		prSubmitterMember.User = &models.User{UserName: "reviewer1"}
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, nil)
		mockGitea.EXPECT().GetTimeline(org, repo, prIndex).Return(nil, nil)
		mockGitea.EXPECT().RequestReviews(&prSubmitterMember, "reviewer2").Return(nil, nil)
		mockGitea.EXPECT().AddComment(&prSubmitterMember, gomock.Any()).Return(nil)
		err := bot.ProcessPR(&prSubmitterMember)
		if err != ReviewNotFinished {
			t.Errorf("Expected ReviewNotFinished error, got %v", err)
		}
	})

	t.Run("Successful Rejection", func(t *testing.T) {
		common.IsDryRun = false
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, nil)
		timeline := []*models.TimelineComment{
			{
				Type:    common.TimelineCommentType_Comment,
				User:    &models.User{UserName: "reviewer2"},
				Body:    "@" + groupName + ": decline",
				HTMLURL: "http://gitea/comment/999",
			},
		}
		mockGitea.EXPECT().GetTimeline(org, repo, prIndex).Return(timeline, nil)
		expectedText := "reviewer2 requested changes on behalf of " + groupName + ". See http://gitea/comment/999"
		mockGitea.EXPECT().AddReviewComment(pr, common.ReviewStateRequestChanges, expectedText).Return(nil, nil)
		mockGitea.EXPECT().UnrequestReview(org, repo, prIndex, gomock.Any()).Return(nil)
		err := bot.ProcessPR(pr)
		if err != nil {
			t.Errorf("Expected nil error, got %v", err)
		}
	})

	t.Run("Config not found", func(t *testing.T) {
		bot.configs = common.AutogitConfigs{}
		err := bot.ProcessPR(pr)
		if err == nil {
			t.Error("Expected error when config is missing, got nil")
		}
	})

	t.Run("Gitea error in GetPullRequestReviews", func(t *testing.T) {
		bot.configs = common.AutogitConfigs{prjConfig}
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, fmt.Errorf("gitea error"))
		err := bot.ProcessPR(pr)
		if err == nil {
			t.Error("Expected error from gitea, got nil")
		}
	})
}

func TestProcessNotifications(t *testing.T) {
	ctrl := gomock.NewController(t)
	defer ctrl.Finish()

	mockGitea := mock_common.NewMockGitea(ctrl)
	groupName := "testgroup"

	bot := &ReviewBot{
		gitea:     mockGitea,
		groupName: groupName,
	}
	bot.InitRegex(groupName)

	org := "myorg"
	repo := "myrepo"
	prIndex := int64(123)
	notificationID := int64(456)

	notification := &models.NotificationThread{
		ID: notificationID,
		Subject: &models.NotificationSubject{
			URL: fmt.Sprintf("http://gitea/api/v1/repos/%s/%s/pulls/%d", org, repo, prIndex),
		},
	}

	t.Run("Notification Success", func(t *testing.T) {
		common.IsDryRun = false
		pr := &models.PullRequest{
			Index: prIndex,
			Base: &models.PRBranchInfo{
				Name: "main",
				Repo: &models.Repository{
					Name:  repo,
					Owner: &models.User{UserName: org},
				},
			},

			Head: &models.PRBranchInfo{
				Sha: "headsha",
				Repo: &models.Repository{
					Name:  repo,
					Owner: &models.User{UserName: org},
				},
			},

			User:               &models.User{UserName: "submitter"},
			RequestedReviewers: []*models.User{{UserName: groupName}},
		}

		mockGitea.EXPECT().GetPullRequest(org, repo, prIndex).Return(pr, nil)

		prjConfig := &common.AutogitConfig{
			GitProjectName: org + "/" + repo + "#main",
			ReviewGroups:   []*common.ReviewGroup{{Name: groupName, Reviewers: []string{"r1"}}},
		}
		bot.configs = common.AutogitConfigs{prjConfig}
		mockGitea.EXPECT().GetPullRequestReviews(org, repo, prIndex).Return(nil, nil)
		timeline := []*models.TimelineComment{
			{
				Type: common.TimelineCommentType_Comment,
				User: &models.User{UserName: "r1"},
				Body: "@" + groupName + ": approve",
			},
		}
		mockGitea.EXPECT().GetTimeline(org, repo, prIndex).Return(timeline, nil)
		expectedText := "r1 approved a review on behalf of " + groupName
		mockGitea.EXPECT().AddReviewComment(pr, common.ReviewStateApproved, expectedText).Return(nil, nil)
		mockGitea.EXPECT().UnrequestReview(org, repo, prIndex, gomock.Any()).Return(nil)

		mockGitea.EXPECT().SetNotificationRead(notificationID).Return(nil)

		bot.ProcessNotifications(notification)

	})

	t.Run("Invalid Notification URL", func(t *testing.T) {
		badNotification := &models.NotificationThread{
			Subject: &models.NotificationSubject{
				URL: "http://gitea/invalid/url",
			},
		}
		bot.ProcessNotifications(badNotification)
	})

	t.Run("Gitea error in GetPullRequest", func(t *testing.T) {
		mockGitea.EXPECT().GetPullRequest(org, repo, prIndex).Return(nil, fmt.Errorf("gitea error"))
		bot.ProcessNotifications(notification)
	})
}

func TestReviewApprovalCheck(t *testing.T) {
	tests := []struct {
		Name      string
		GroupName string
		InString  string
		Approved  bool
		Rejected  bool
	}{
		{
			Name:      "Empty String",
			GroupName: "group",
			InString:  "",
		},
		{
			Name:      "Random Text",
			GroupName: "group",
			InString:  "some things LGTM",
		},
		{
			Name:      "Group name with Random Text means disapproval",
			GroupName: "group",
			InString:  "@group: some things LGTM",
			Rejected:  true,
		},
		{
			Name:      "Bad name with Approval",
			GroupName: "group2",
			InString:  "@group: LGTM",
		},
		{
			Name:      "Bad name with Approval",
			GroupName: "group2",
			InString:  "@group: LGTM",
		},
		{
			Name:      "LGTM approval",
			GroupName: "group2",
			InString:  "@group2: LGTM",
			Approved:  true,
		},
		{
			Name:      "approval",
			GroupName: "group2",
			InString:  "@group2: approved",
			Approved:  true,
		},
		{
			Name:      "approval",
			GroupName: "group2",
			InString:  "@group2: approve",
			Approved:  true,
		},
		{
			Name:      "disapproval",
			GroupName: "group2",
			InString:  "@group2: disapprove",
			Rejected:  true,
		},
		{
			Name:      "Whitespace before colon",
			GroupName: "group",
			InString:  "@group  : LGTM",
			Approved:  true,
		},
		{
			Name:      "No whitespace after colon",
			GroupName: "group",
			InString:  "@group:LGTM",
			Approved:  true,
		},
		{
			Name:      "Leading and trailing whitespace on line",
			GroupName: "group",
			InString:  "   @group: LGTM   ",
			Approved:  true,
		},
		{
			Name:      "Multiline: Approved on second line",
			GroupName: "group",
			InString:  "Random noise\n@group: approved",
			Approved:  true,
		},
		{
			Name:      "Multiline: Multiple group mentions, first wins",
			GroupName: "group",
			InString:  "@group: decline\n@group: approve",
			Rejected:  true,
		},
		{
			Name:      "Multiline: Approved on second line",
			GroupName: "group",
			InString:  "noise\n@group: approve\nmore noise",
			Approved:  true,
		},
		{
			Name:      "Not at start of line (even with whitespace)",
			GroupName: "group",
			InString:  "Hello @group: approve",
			Approved:  false,
		},
		{
			Name:      "Rejecting with reason",
			GroupName: "group",
			InString:  "@group: decline because of X, Y and Z",
			Rejected:  true,
		},
		{
			Name:      "No colon after group",
			GroupName: "group",
			InString:  "@group LGTM",
			Approved:  false,
			Rejected:  false,
		},
		{
			Name:      "Invalid char after group",
			GroupName: "group",
			InString:  "@group! LGTM",
			Approved:  false,
			Rejected:  false,
		},
	}
	for _, test := range tests {
		t.Run(test.Name, func(t *testing.T) {
			bot := &ReviewBot{}
			bot.InitRegex(test.GroupName)

			if r := bot.ReviewAccepted(test.InString); r != test.Approved {
				t.Error("ReviewAccepted() returned", r, "expecting", test.Approved)
			}
			if r := bot.ReviewRejected(test.InString); r != test.Rejected {
				t.Error("ReviewRejected() returned", r, "expecting", test.Rejected)
			}
		})
	}
}