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)
	}
	view := ansi.Strip(strings.Join(
		m.prEditFieldLines("reviewers", prEditReviewersField, 80), "\n",
	))
	if !strings.Contains(view, "comma separates users") {
		t.Fatalf("reviewer completion help missing:\n%s", view)
	}
}

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 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)
	}
}