package tui

import (
	"context"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"

	"agentu/internal/agent"
	"agentu/pkg/llm"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

func TestModelRendersChatShell(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)
	rendered := m.View()

	for _, want := range []string{"test-model", "yolo tools", "light", "ctrl+j", "alt+enter"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("rendered view missing %q:\n%s", want, rendered)
		}
	}
	if strings.Contains(rendered, "local agent") {
		t.Fatalf("top header should not render:\n%s", rendered)
	}
	if _, ok := m.styles.App.GetBackground().(lipgloss.NoColor); !ok {
		t.Fatalf("app should not paint a global background")
	}
	if _, ok := m.styles.Viewport.GetBackground().(lipgloss.NoColor); !ok {
		t.Fatalf("viewport should not paint an assistant background")
	}
}

func TestInputTextDoesNotPaintBackground(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	for name, color := range map[string]any{
		"input box":           m.styles.InputBox.GetBackground(),
		"focused base":        m.input.FocusedStyle.Base.GetBackground(),
		"focused cursor line": m.input.FocusedStyle.CursorLine.GetBackground(),
		"blurred base":        m.input.BlurredStyle.Base.GetBackground(),
		"blurred cursor line": m.input.BlurredStyle.CursorLine.GetBackground(),
	} {
		if _, ok := color.(lipgloss.NoColor); !ok {
			t.Fatalf("%s should not paint input text background", name)
		}
	}
}

func TestInputBoxIsRoomier(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)

	if got := m.styles.InputBox.GetVerticalFrameSize(); got != 2 {
		t.Fatalf("input box vertical frame should stay compact, got %d", got)
	}
	if got := m.styles.InputBox.GetHorizontalFrameSize(); got < 6 {
		t.Fatalf("input box horizontal frame should include roomier padding, got %d", got)
	}
	if got, want := m.input.Width(), 100-m.styles.InputBox.GetHorizontalFrameSize(); got != want {
		t.Fatalf("input content width = %d, want %d", got, want)
	}
	rendered := m.inputView()
	line := strings.Split(rendered, "\n")[0]
	if got := lipgloss.Width(line); got != 100 {
		t.Fatalf("input box rendered width = %d, want 100:\n%s", got, rendered)
	}
}

func TestModelMetaRendersBelowInput(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	rendered := next.(model).View()

	inputIndex := strings.Index(rendered, "Message agentu")
	modelIndex := strings.Index(rendered, "test-model")
	if inputIndex < 0 || modelIndex < 0 {
		t.Fatalf("rendered view missing input or model meta:\n%s", rendered)
	}
	if modelIndex < inputIndex {
		t.Fatalf("model meta should render below input:\n%s", rendered)
	}
}

func TestModelMetaRendersContextUsage(t *testing.T) {
	assistant := agent.New(agent.Options{Model: "test-model", MaxContextTokens: 1000})
	assistant.SetMessages([]llm.Message{{Role: llm.RoleUser, Content: strings.Repeat("x", 800)}})
	m := newModel(context.Background(), assistant, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 120, Height: 30})
	rendered := next.(model).modelMetaView()

	for _, want := range []string{"ctx ~", "/1k", "%"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("model meta missing %q:\n%s", want, rendered)
		}
	}
}

func TestInitialViewDoesNotRenderTopNote(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	rendered := next.(model).View()

	for _, unwanted := range []string{"Note", "Ask anything", "Start a conversation"} {
		if strings.Contains(rendered, unwanted) {
			t.Fatalf("initial view should not render %q:\n%s", unwanted, rendered)
		}
	}
}

func TestRunningStateRendersActivityIndicator(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)
	m.running = true
	m.status = "thinking..."
	m.resize()

	rendered := m.View()
	for _, want := range []string{"Working", "thinking...", "esc cancels"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("running view missing %q:\n%s", want, rendered)
		}
	}
}

func TestUserMessageRendersFullWidthBubble(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)

	rendered := m.messageView(roleUser, "hi", 80)
	if !strings.Contains(rendered, "hi") {
		t.Fatalf("user message missing content:\n%s", rendered)
	}
	if strings.Contains(rendered, "You") {
		t.Fatalf("user message should not render label:\n%s", rendered)
	}
	if !strings.Contains(rendered, " hi") || !strings.Contains(rendered, "hi ") {
		t.Fatalf("user message should have horizontal padding:\n%q", rendered)
	}
	lines := strings.Split(rendered, "\n")
	if len(lines) < 3 {
		t.Fatalf("user message background should include vertical padding:\n%q", rendered)
	}
	for _, line := range lines {
		if got := lipgloss.Width(line); got != 80 {
			t.Fatalf("user message background should span full width, line width = %d:\n%q", got, rendered)
		}
	}
	m.width = 80
	m.messages = []message{{role: roleUser, content: "hi"}}
	rendered = m.renderMessages()
	for _, line := range strings.Split(rendered, "\n") {
		if got := lipgloss.Width(line); got != 80 {
			t.Fatalf("rendered user transcript should span full width, line width = %d:\n%q", got, rendered)
		}
	}
}

func TestAssistantMessagesRenderMarkdownWithoutChrome(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)

	rendered := m.messageView(roleAssistant, "# Title\n\n- item", 80)
	for _, want := range []string{"Title", "item"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("assistant markdown missing %q:\n%s", want, rendered)
		}
	}
	for _, unwanted := range []string{"Agentu", "│", "┃", "|"} {
		if strings.Contains(rendered, unwanted) {
			t.Fatalf("assistant message should not render chrome %q:\n%s", unwanted, rendered)
		}
	}
	if strings.Contains(rendered, "# Title") {
		t.Fatalf("assistant markdown heading was not rendered:\n%s", rendered)
	}
}

func TestAssistantMessageRendersPaddedBodyWithoutBackground(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)
	if _, ok := m.styles.AssistantMsg.GetBackground().(lipgloss.NoColor); !ok {
		t.Fatalf("assistant message should not set a background color")
	}

	rendered := m.messageView(roleAssistant, "hello", 80)
	if !strings.Contains(rendered, "hello") {
		t.Fatalf("assistant message missing content:\n%s", rendered)
	}
	lines := strings.Split(rendered, "\n")
	if len(lines) < 3 {
		t.Fatalf("assistant message should include vertical padding:\n%q", rendered)
	}
	if got := lipgloss.Width(rendered); got <= len("hello") {
		t.Fatalf("assistant message should be wider than text, width = %d:\n%q", got, rendered)
	}
	for _, line := range lines {
		if got := lipgloss.Width(line); got >= 80 {
			t.Fatalf("assistant message should not fill the row, line width = %d:\n%q", got, rendered)
		}
	}
}

func TestUserMessagesDoNotRenderMarkdown(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)

	rendered := m.messageView(roleUser, "# Title\n\n- item", 80)
	for _, want := range []string{"# Title", "- item"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("user markdown should stay plain and include %q:\n%s", want, rendered)
		}
	}
}

func TestMessageRoleLabelsDoNotLabelUserOrAssistant(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)
	m.messages = []message{
		{role: roleUser, content: "hello"},
		{role: roleAssistant, content: "hi"},
	}

	rendered := m.renderMessages()
	for _, want := range []string{"hello", "hi"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("messages missing content %q:\n%s", want, rendered)
		}
	}
	for _, unwanted := range []string{"You", "Agentu"} {
		if strings.Contains(rendered, unwanted) {
			t.Fatalf("message should not render label %q:\n%s", unwanted, rendered)
		}
	}
}

func TestCtrlJInsertsInputNewline(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	m.input.SetValue("hello")

	next, _ := m.Update(tea.KeyMsg{Type: tea.KeyCtrlJ})
	got := next.(model).input.Value()
	if got != "hello\n" {
		t.Fatalf("input value = %q", got)
	}
}

func TestInputStartsAtOneLineAndGrows(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model"})
	if got := m.input.Height(); got != 1 {
		t.Fatalf("initial input height = %d", got)
	}

	m.input.SetValue("one\ntwo\nthree")
	m.afterInputChanged()
	if got := m.input.Height(); got != 3 {
		t.Fatalf("multiline input height = %d", got)
	}

	m.input.SetValue(strings.Repeat("line\n", 20))
	m.afterInputChanged()
	if got := m.input.Height(); got != maxInputLines {
		t.Fatalf("clamped input height = %d", got)
	}
}

func TestSlashCommandSuggestions(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true})
	next, _ := m.Update(tea.WindowSizeMsg{Width: 100, Height: 30})
	m = next.(model)
	m.input.SetValue("/")
	m.afterInputChanged()

	rendered := m.View()
	for _, want := range []string{"/clear reset context", "/compact compress context", "/exit quit", "/model model/provider/thinking"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("rendered suggestions missing %q:\n%s", want, rendered)
		}
	}
}

type tuiCompactProvider struct{}

func (tuiCompactProvider) ChatStream(ctx context.Context, req llm.ChatRequest, emit func(llm.StreamEvent) error) error {
	return emit(llm.StreamEvent{Content: "summary from tui"})
}

func TestCompactCommand(t *testing.T) {
	assistant := agent.New(agent.Options{Provider: tuiCompactProvider{}, Model: "test", SystemPrompt: "system"})
	assistant.SetMessages([]llm.Message{
		{Role: llm.RoleSystem, Content: "system"},
		{Role: llm.RoleUser, Content: "old question 1"},
		{Role: llm.RoleAssistant, Content: "old answer 1"},
		{Role: llm.RoleUser, Content: "old question 2"},
		{Role: llm.RoleAssistant, Content: "old answer 2"},
		{Role: llm.RoleUser, Content: "recent question 1"},
		{Role: llm.RoleAssistant, Content: "recent answer 1"},
		{Role: llm.RoleUser, Content: "recent question 2"},
		{Role: llm.RoleAssistant, Content: "recent answer 2"},
	})
	m := newModel(context.Background(), assistant, Options{ModelName: "test-model"})

	out, err := m.handleLocalCommand("/compact")
	if err != nil {
		t.Fatal(err)
	}
	if out != "Context compacted." {
		t.Fatalf("output = %q", out)
	}
	if !strings.Contains(messageContents(assistant.Messages()), "[context summary]") {
		t.Fatalf("messages missing summary: %#v", assistant.Messages())
	}
}

func messageContents(messages []llm.Message) string {
	var b strings.Builder
	for _, msg := range messages {
		b.WriteString(msg.Content)
		b.WriteByte('\n')
	}
	return b.String()
}

func TestWorkflowStatusDiffAndTestCommands(t *testing.T) {
	if _, err := exec.LookPath("git"); err != nil {
		t.Skip("git not installed")
	}
	dir := t.TempDir()
	runInDir(t, dir, "git", "init")
	runInDir(t, dir, "git", "config", "user.email", "agentu@example.test")
	runInDir(t, dir, "git", "config", "user.name", "agentu")
	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte("module example.com/p1\n\ngo 1.26\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "main_test.go"), []byte("package p1\n\nimport \"testing\"\n\nfunc TestOK(t *testing.T) {}\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	runInDir(t, dir, "git", "add", ".")
	runInDir(t, dir, "git", "commit", "-m", "init")
	if err := os.WriteFile(filepath.Join(dir, "main_test.go"), []byte("package p1\n\nimport \"testing\"\n\nfunc TestOK(t *testing.T) { t.Log(\"changed\") }\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	m := newModel(context.Background(), nil, Options{ModelName: "test-model", WorkingDir: dir})
	status, err := m.handleStatusCommand(nil)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(status, "main_test.go") {
		t.Fatalf("status missing changed file:\n%s", status)
	}
	diff, err := m.handleDiffCommand(nil)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(diff, "changed") {
		t.Fatalf("diff missing changed content:\n%s", diff)
	}
	out, err := m.handleTestCommand(nil)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(out, "$ go test ./...") {
		t.Fatalf("test output missing default command:\n%s", out)
	}
}

func runInDir(t *testing.T, dir string, name string, args ...string) {
	t.Helper()
	cmd := exec.Command(name, args...)
	cmd.Dir = dir
	if output, err := cmd.CombinedOutput(); err != nil {
		t.Fatalf("%s %v failed: %v\n%s", name, args, err, output)
	}
}

func TestModelCommand(t *testing.T) {
	m := newModel(context.Background(), nil, Options{ModelName: "test-model", Yolo: true})
	m.input.SetValue("/model")

	next, _ := m.submit()
	rendered := next.(model).renderMessages()
	for _, want := range []string{"model: test-model", "mode: yolo tools", "theme: light"} {
		if !strings.Contains(rendered, want) {
			t.Fatalf("model command output missing %q:\n%s", want, rendered)
		}
	}
}

func TestModelThinkingCommand(t *testing.T) {
	manager := &fakeModelManager{model: "test-model", thinking: "none"}
	m := newModel(context.Background(), nil, Options{ModelName: "test-model", ModelManager: manager})
	m.input.SetValue("/model thinking high")

	next, _ := m.submit()
	rendered := next.(model).renderMessages()
	if manager.thinking != "high" {
		t.Fatalf("thinking = %q", manager.thinking)
	}
	if !strings.Contains(rendered, "thinking: high") {
		t.Fatalf("model command output missing thinking:\n%s", rendered)
	}
}

type fakeModelManager struct {
	provider    string
	model       string
	thinking    string
	sessionName string
	saved       bool
}

func (f *fakeModelManager) CurrentProvider() string {
	if f.provider == "" {
		return "default"
	}
	return f.provider
}

func (f *fakeModelManager) CurrentModel() string {
	return f.model
}

func (f *fakeModelManager) CurrentThinking() string {
	return f.thinking
}

func (f *fakeModelManager) CurrentSessionID() string {
	return "test-id"
}

func (f *fakeModelManager) CurrentSessionName() string {
	if f.sessionName == "" {
		return "test-session"
	}
	return f.sessionName
}

func (f *fakeModelManager) Info() string {
	return "provider: " + f.CurrentProvider() + "\nmodel: " + f.model + "\nthinking: " + f.thinking
}

func (f *fakeModelManager) SetProvider(name string) (string, error) {
	f.provider = name
	return f.Info(), nil
}

func (f *fakeModelManager) SetModel(model string) (string, error) {
	f.model = model
	return f.Info(), nil
}

func (f *fakeModelManager) SetThinking(level string) (string, error) {
	f.thinking = level
	return f.Info(), nil
}

func (f *fakeModelManager) Save() error {
	f.saved = true
	return nil
}

func (f *fakeModelManager) Resume(id string) error {
	return nil
}

func (f *fakeModelManager) Rename(name string) (string, error) {
	f.sessionName = name
	return "Renamed.", nil
}

func (f *fakeModelManager) Sessions() (string, error) {
	return "No sessions.", nil
}

func (f *fakeModelManager) NewSession() (string, error) {
	return "New session.", nil
}

func TestParseThemeMode(t *testing.T) {
	for input, want := range map[string]ThemeMode{
		"":      ThemeLight,
		"light": ThemeLight,
		"dark":  ThemeDark,
		"DARK":  ThemeDark,
	} {
		got, err := ParseThemeMode(input)
		if err != nil {
			t.Fatalf("ParseThemeMode(%q): %v", input, err)
		}
		if got != want {
			t.Fatalf("ParseThemeMode(%q) = %q, want %q", input, got, want)
		}
	}

	if _, err := ParseThemeMode("sepia"); err == nil {
		t.Fatal("expected invalid theme error")
	}
}

func TestCleanToolLog(t *testing.T) {
	got := cleanToolLog("\n[tool] shell_run {\"command\":\"pwd\"}\n")
	want := `shell_run {"command":"pwd"}`
	if got != want {
		t.Fatalf("got %q want %q", got, want)
	}
}