package app

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

	"glint/internal/theme"

	tea "github.com/charmbracelet/bubbletea"
)

func TestHeaderTextIsBasenameWithoutExtension(t *testing.T) {
	a := newApp()
	a.path = "/tmp/notes/my-note.md"
	if got := a.headerText(); got != "my-note" {
		t.Errorf("headerText() = %q, want my-note", got)
	}
}

func TestHeaderTextMarksDirty(t *testing.T) {
	a := newApp()
	a.path = "/tmp/notes/my-note.md"
	a.editor.Dirty = true
	if got := a.headerText(); got != "my-note •" {
		t.Errorf("headerText() = %q, want 'my-note •'", got)
	}
}

func TestHeaderTextForPathlessBuffer(t *testing.T) {
	a := newApp()
	a.path = ""
	if got := a.headerText(); got != "Untitled" {
		t.Errorf("headerText() = %q, want Untitled", got)
	}
}

func TestHeaderIgnoresFrontmatterTitle(t *testing.T) {
	dir := t.TempDir()
	p := filepath.Join(dir, "on-disk.md")
	os.WriteFile(p, []byte("---\ntitle: Something Else\n---\n\nbody"), 0o644)

	a := newApp()
	if err := a.Load(p); err != nil {
		t.Fatal(err)
	}
	if got := a.headerText(); got != "on-disk" {
		t.Errorf("headerText() = %q, want on-disk (edit mode shows the file, not the title)", got)
	}
}

func TestHeaderBarAppearsInEditorView(t *testing.T) {
	dir := t.TempDir()
	p := filepath.Join(dir, "visible.md")
	os.WriteFile(p, []byte("body"), 0o644)

	a := newApp()
	a.theme = theme.FlexokiDark()
	a.editor.SetTheme(theme.FlexokiDark())
	a.Load(p)
	a.Update(tea.WindowSizeMsg{Width: 100, Height: 12})
	if !strings.Contains(a.View(), "visible") {
		t.Errorf("editor View() has no filename header:\n%s", a.View())
	}
}

func TestHeaderCostsNoTextRows(t *testing.T) {
	dir := t.TempDir()
	p := filepath.Join(dir, "rows.md")
	os.WriteFile(p, []byte("body"), 0o644)

	a := newApp()
	a.Load(p)
	a.Update(tea.WindowSizeMsg{Width: 100, Height: 20})
	gotW, gotH := a.editor.Width, a.editor.Height
	if gotH != 20-1-canvasTopPad {
		t.Errorf("editor height = %d, want %d (header must not steal a text row)", gotH, 20-1-canvasTopPad)
	}
	if gotW != a.contentWidth() {
		t.Errorf("editor width = %d, want %d", gotW, a.contentWidth())
	}
}

func TestViewIsExactlyHeightRows(t *testing.T) {
	dir := t.TempDir()
	p := filepath.Join(dir, "rows2.md")
	os.WriteFile(p, []byte("body"), 0o644)

	a := newApp()
	a.Load(p)
	a.Update(tea.WindowSizeMsg{Width: 100, Height: 14})
	if n := len(strings.Split(a.View(), "\n")); n != 14 {
		t.Errorf("View() = %d lines, want 14 (canvas height-1 + status bar)", n)
	}
}

func TestHeaderHiddenInPicker(t *testing.T) {
	a := newApp()
	a.path = "/tmp/notes/hidden.md"
	a.mode = ModePicker
	if a.showHeader() {
		t.Error("showHeader() = true in ModePicker, want false")
	}
}

func TestHeaderHiddenInPreviewAndHelp(t *testing.T) {
	a := newApp()
	a.path = "/tmp/notes/hidden.md"
	for _, m := range []Mode{ModePreview, ModeHelp} {
		a.mode = m
		if a.showHeader() {
			t.Errorf("showHeader() = true in mode %d, want false", m)
		}
	}
}

func TestHeaderShownInOverlayModes(t *testing.T) {
	a := newApp()
	a.path = "/tmp/notes/shown.md"
	for _, m := range []Mode{ModeEditor, ModeFind, ModeGotoLine, ModeSpell} {
		a.mode = m
		if !a.showHeader() {
			t.Errorf("showHeader() = false in mode %d, want true", m)
		}
	}
}