package main

import (
	"slices"
	"strings"
	"testing"
	"time"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/x/ansi"
)

func TestReviewerCompletionSupportsMultipleEligibleUsers(t *testing.T) {
	m := NewApp(&recordingPRService{}, "o", "r", false, 50, time.Second)
	m.width = 80
	m.details = PRDetails{
		PullRequest: PullRequest{Author: "author"},
		ViewerLogin: "current",
	}
	m.prEditField = prEditReviewersField
	m.prEditEditors[prEditReviewersField] = newTextEditor("alice, bo", false)
	m.prEditUsers = []RepositoryUser{
		{Login: "alice", Name: "Alice", CanReview: true},
		{Login: "bob", Name: "Bob", CanReview: true},
		{Login: "author", Name: "Author", CanReview: true},
		{Login: "carol", Name: "Carol", CanAssign: true},
	}

	suggestions := m.userSuggestions()
	if len(suggestions) != 1 || suggestions[0].user.Login != "bob" {
		t.Fatalf("reviewer suggestions = %#v", suggestions)
	}
	if !m.completeUserSuggestion() ||
		m.prEditEditors[prEditReviewersField].Text != "alice, bob" {
		t.Fatalf("completed reviewers = %q", m.prEditEditors[prEditReviewersField].Text)
	}
	displayEditor := m.prEditDisplayEditor(prEditReviewersField, 76)
	if displayEditor.Text != "@alice, @bob" {
		t.Fatalf("completed reviewer display = %q", displayEditor.Text)
	}
	if displayEditor.Cursor != len([]rune(displayEditor.Text)) {
		t.Fatalf("completed reviewer display cursor = %d", displayEditor.Cursor)
	}
	view := ansi.Strip(strings.Join(
		m.prEditFieldLines("reviewers", prEditReviewersField, 80), "\n",
	))
	if !strings.Contains(view, "@alice, @bob") ||
		!strings.Contains(view, "no matching eligible users") {
		t.Fatalf("completed reviewer field is inconsistent:\n%s", view)
	}
}

func TestReviewerInputCommitsMultipleEligibleUsersWithSpace(t *testing.T) {
	m := NewApp(&recordingPRService{}, "o", "r", false, 50, time.Second)
	m.writeMode = writePREdit
	m.prEditField = prEditReviewersField
	m.details = PRDetails{PullRequest: PullRequest{Author: "author"}}
	m.prEditUsers = []RepositoryUser{
		{Login: "alice", CanReview: true},
		{Login: "bob", CanReview: true},
		{Login: "carol", CanReview: true},
	}
	m.prEditEditors[prEditReviewersField] = newTextEditor("bob", false)

	suggestions := m.userSuggestions()
	if len(suggestions) != 2 ||
		suggestions[0].user.Login != "alice" ||
		suggestions[1].user.Login != "carol" {
		t.Fatalf("suggestions after complete reviewer = %#v", suggestions)
	}
	view := ansi.Strip(strings.Join(
		m.prEditFieldLines("reviewers", prEditReviewersField, 80), "\n",
	))
	if !strings.Contains(view, "space starts next reviewer") {
		t.Fatalf("multi-reviewer completion help missing:\n%s", view)
	}
	updated, _ := m.updatePREditInput(tea.KeyMsg{Type: tea.KeySpace})
	m = updated.(App)
	if got := m.prEditEditors[prEditReviewersField].Text; got != "bob, " {
		t.Fatalf("space after complete reviewer produced %q", got)
	}
	if !m.completeUserSuggestion() {
		t.Fatal("next reviewer suggestion was not completed")
	}
	if got := m.prEditEditors[prEditReviewersField].Text; got != "bob, alice" {
		t.Fatalf("multiple reviewer input = %q", got)
	}
	suggestions = m.userSuggestions()
	if len(suggestions) != 1 || suggestions[0].user.Login != "carol" {
		t.Fatalf("already selected reviewers remained in suggestions: %#v", suggestions)
	}
	display := m.prEditDisplayEditor(prEditReviewersField, 76)
	if display.Text != "@bob, @alice" {
		t.Fatalf("multiple reviewer display = %q", display.Text)
	}

	m.prEditEditors[prEditReviewersField] = newTextEditor("bo", false)
	updated, _ = m.updatePREditInput(tea.KeyMsg{Type: tea.KeySpace})
	m = updated.(App)
	if got := m.prEditEditors[prEditReviewersField].Text; got != "bo" {
		t.Fatalf("space after incomplete reviewer produced %q", got)
	}
}

func TestReviewerDisplayColorsOnlyCompleteEligibleNames(t *testing.T) {
	m := NewApp(&recordingPRService{}, "o", "r", false, 50, time.Second)
	m.details = PRDetails{PullRequest: PullRequest{Author: "author"}}
	m.prEditUsers = []RepositoryUser{
		{Login: "bob", CanReview: true},
		{Login: "assignee-only", CanAssign: true},
		{Login: "author", CanReview: true},
	}
	m.prEditEditors[prEditReviewersField] = newTextEditor("bo, assignee-only, author", false)

	display := m.prEditDisplayEditor(prEditReviewersField, 76)
	if display.Text != "bo, assignee-only, author" || len(display.protectedStyles) != 0 {
		t.Fatalf("partial or ineligible reviewers were decorated: %#v", display)
	}

	m.prEditEditors[prEditReviewersField] = newTextEditor("bob, @BOB", false)
	display = m.prEditDisplayEditor(prEditReviewersField, 76)
	if display.Text != "@bob, @BOB" {
		t.Fatalf("eligible reviewer display = %q", display.Text)
	}
	if len(display.protectedStyles) != 2 {
		t.Fatalf("eligible reviewer styles = %#v", display.protectedStyles)
	}
	for _, style := range display.protectedStyles {
		if style.color != string(authorColor("bob")) {
			t.Fatalf("eligible reviewer color = %q, want normal author color", style.color)
		}
	}
}

func TestReviewerSuggestionsPreferRecentRepositoryActivity(t *testing.T) {
	now := time.Now()
	m := NewApp(&recordingPRService{}, "o", "r", false, 50, time.Second)
	m.details = PRDetails{PullRequest: PullRequest{Author: "author"}}
	m.prEditField = prEditReviewersField
	m.prEditEditors[prEditReviewersField] = newTextEditor("", false)
	m.prEditUsers = []RepositoryUser{
		{
			Login: "old-contributor", CanReview: true, RecentCommits: 30,
			LastContributionAt: now.AddDate(-2, 0, 0),
		},
		{
			Login: "active-contributor", CanReview: true, RecentCommits: 3,
			RecentAdditions: 50, LastContributionAt: now.Add(-24 * time.Hour),
		},
		{Login: "never-contributed", CanReview: true},
	}

	suggestions := m.userSuggestions()
	if len(suggestions) != 3 || suggestions[0].user.Login != "active-contributor" {
		t.Fatalf("activity-ranked reviewers = %#v", suggestions)
	}
}

func TestPREditStartsWithCurrentRequestedReviewers(t *testing.T) {
	m := NewApp(&recordingPRService{}, "o", "r", false, 50, time.Second)
	m.loading = false
	m.details = PRDetails{
		PullRequest: PullRequest{
			ID: "pr", Owner: "o", Repository: "r", Title: "Title",
		},
		BaseRef: "main", RequestedReviewers: []string{"alice", "bob"},
		Assignees:   []string{"carol"},
		Permissions: ViewerPermissions{CanUpdatePR: true, CanAssign: true},
	}
	m.startPREdit()
	if got := m.prEditEditors[prEditReviewersField].Text; got != "alice, bob" {
		t.Fatalf("reviewer field = %q", got)
	}
	if got := m.prEditEditors[prEditAssigneesField].Text; got != "carol" {
		t.Fatalf("assignee field = %q", got)
	}
}

func TestPREditShowsCompletedAndTeamReviewersReadOnly(t *testing.T) {
	m := NewApp(&recordingPRService{}, "o", "r", false, 50, time.Second)
	m.loading = false
	m.details = PRDetails{
		PullRequest: PullRequest{
			ID: "pr", Owner: "o", Repository: "r", Title: "Title",
		},
		BaseRef:            "main",
		RequestedReviewers: []string{"pending-user", "rerequested-user"},
		Reviewers: []Reviewer{
			{Login: "approved-user", State: "APPROVED"},
			{Login: "backend-team", State: "REVIEW_REQUESTED"},
			{Login: "commented-user", State: "COMMENTED"},
			{Login: "pending-user", State: "REVIEW_REQUESTED"},
			{Login: "rerequested-user", State: "APPROVED"},
		},
		Permissions: ViewerPermissions{CanUpdatePR: true, CanAssign: true},
	}
	m.startPREdit()

	if got := m.prEditEditors[prEditReviewersField].Text; got != "pending-user, rerequested-user" {
		t.Fatalf("editable reviewer requests = %q", got)
	}
	view := ansi.Strip(strings.Join(
		m.prEditFieldLines("reviewers", prEditReviewersField, 80), "\n",
	))
	for _, expected := range []string{
		"pending requests editable",
		"[@approved-user · approved]",
		"[@backend-team · review requested]",
		"[@commented-user · commented]",
	} {
		if !strings.Contains(view, expected) {
			t.Fatalf("reviewer field does not show %q:\n%s", expected, view)
		}
	}
	for _, editable := range []string{"pending-user", "rerequested-user"} {
		if strings.Contains(view, "[@"+editable) {
			t.Fatalf("pending request @%s was rendered as a protected token:\n%s", editable, view)
		}
	}
	displayEditor := m.prEditDisplayEditor(prEditReviewersField, 76)
	if len(displayEditor.protectedStyles) != 3 {
		t.Fatalf("protected reviewer styles = %#v", displayEditor.protectedStyles)
	}
	firstStyle := displayEditor.protectedStyles[0]
	displayRunes := []rune(displayEditor.Text)
	if got := string(displayRunes[firstStyle.start:firstStyle.end]); got != "@approved-user" {
		t.Fatalf("first protected author span = %q", got)
	}
	if firstStyle.color != string(darkenColor(authorColor("approved-user"))) {
		t.Fatalf("protected author color = %q, want darkened deterministic color", firstStyle.color)
	}

	m.prEditEditors[prEditReviewersField] = newTextEditor("pending-user", false)
	view = ansi.Strip(strings.Join(
		m.prEditFieldLines("reviewers", prEditReviewersField, 80), "\n",
	))
	if !strings.Contains(view, "[@rerequested-user · approved]") {
		t.Fatalf("removed re-review request did not retain its submitted review read-only:\n%s", view)
	}

	m.prEditEditors[prEditReviewersField] = newTextEditor("", false)
	for range 20 {
		m.prEditEditors[prEditReviewersField].handleKey(
			tea.KeyMsg{Type: tea.KeyBackspace}, false,
		)
		m.prEditEditors[prEditReviewersField].handleKey(
			tea.KeyMsg{Type: tea.KeyDelete}, false,
		)
	}
	if m.prEditEditors[prEditReviewersField].Text != "" ||
		!strings.Contains(
			ansi.Strip(strings.Join(
				m.prEditFieldLines("reviewers", prEditReviewersField, 80), "\n",
			)),
			"[@approved-user · approved]",
		) {
		t.Fatal("editing the reviewer field modified a protected reviewer token")
	}
}

func TestReviewerSuggestionsExcludeExistingReviewers(t *testing.T) {
	m := NewApp(&recordingPRService{}, "o", "r", false, 50, time.Second)
	m.details = PRDetails{
		PullRequest: PullRequest{Author: "author"},
		Reviewers: []Reviewer{
			{Login: "approved-user", State: "APPROVED"},
			{Login: "commented-user", State: "COMMENTED"},
		},
	}
	m.prEditField = prEditReviewersField
	m.prEditEditors[prEditReviewersField] = newTextEditor("", false)
	m.prEditUsers = []RepositoryUser{
		{Login: "approved-user", CanReview: true},
		{Login: "commented-user", CanReview: true},
		{Login: "new-user", CanReview: true},
	}

	suggestions := m.userSuggestions()
	if len(suggestions) != 1 || suggestions[0].user.Login != "new-user" {
		t.Fatalf("reviewer suggestions include existing reviewers: %#v", suggestions)
	}
}

func TestPeopleOnlyPREditSkipsCoreMetadataMutation(t *testing.T) {
	service := &recordingPRService{}
	m := NewApp(service, "o", "r", false, 50, time.Second)
	m.screen, m.loading, m.width, m.height = dashboardScreen, false, 80, 30
	m.details = PRDetails{
		PullRequest: PullRequest{
			ID: "pr", Owner: "o", Repository: "r", Number: 4,
			Title: "Title", Author: "author",
		},
		BaseRef: "main", RequestedReviewers: []string{"alice"},
		Permissions: ViewerPermissions{CanUpdatePR: true, CanAssign: true},
	}
	m.startPREdit()
	m.prEditUsers = []RepositoryUser{
		{Login: "alice", CanReview: true},
		{Login: "bob", CanReview: true, CanAssign: true},
	}
	m.prEditUsersLoading = false
	m.prEditEditors[prEditReviewersField] = newTextEditor("alice, bob", false)
	m.prEditEditors[prEditAssigneesField] = newTextEditor("bob", false)
	if err := m.validatePREdit(); err != nil {
		t.Fatal(err)
	}

	m.writeMode = writePREditConfirm
	updated, command := m.updatePREditInput(tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune("y")})
	m = updated.(App)
	if command == nil {
		t.Fatal("people update did not create a command")
	}
	msg := command().(pullRequestUpdatedMsg)
	if msg.err != nil {
		t.Fatal(msg.err)
	}
	if service.updateID != "" {
		t.Fatalf("people-only edit rewrote core metadata for %q", service.updateID)
	}
	if !slices.Equal(service.people.Reviewers, []string{"alice", "bob"}) ||
		!slices.Equal(service.people.Assignees, []string{"bob"}) {
		t.Fatalf("people update = %#v", service.people)
	}
}

func TestApplyingUserReviewersPreservesTeamRequestsAndCompletedReviews(t *testing.T) {
	m := App{details: PRDetails{
		RequestedReviewers: []string{"old-user"},
		Reviewers: []Reviewer{
			{Login: "old-user", State: "REVIEW_REQUESTED"},
			{Login: "backend-team", State: "REVIEW_REQUESTED"},
			{Login: "approved-user", State: "APPROVED"},
		},
	}}
	m.applyPREditPeople(PullRequestPeople{
		Reviewers: []string{"new-user"},
		Assignees: []string{"assignee"},
	})
	got := make(map[string]string)
	for _, reviewer := range m.details.Reviewers {
		got[reviewer.Login] = reviewer.State
	}
	if len(got) != 3 || got["backend-team"] != "REVIEW_REQUESTED" ||
		got["approved-user"] != "APPROVED" ||
		got["new-user"] != "REVIEW_REQUESTED" {
		t.Fatalf("reviewers after update = %#v", m.details.Reviewers)
	}
}