package main

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

	"github.com/charmbracelet/lipgloss"

	"todoapp/internal/todos"
)

func assertFits(t *testing.T, view string, width, height int) {
	t.Helper()
	lines := strings.Split(strings.TrimSuffix(view, "\n"), "\n")
	if len(lines) > height {
		t.Fatalf("view is %d lines in %d-row terminal:\n%s", len(lines), height, view)
	}
	for _, line := range lines {
		if lipgloss.Width(line) > width {
			t.Fatalf("line is %d cells in %d-column terminal: %q", lipgloss.Width(line), width, line)
		}
	}
}

func TestStyledScreensFitTerminals(t *testing.T) {
	for _, size := range [][2]int{{80, 24}, {50, 14}, {32, 10}} {
		width, height := size[0], size[1]
		app := model{width: width, height: height, project: "/tmp/project", todosDir: "/tmp/project/.pi/todos", items: []todos.Todo{
			{ID: "deadbeef", Title: "A long title for a narrow terminal", Status: "open", Tags: []string{"qa"}, Body: "# Long heading\n\nBody text."},
			{ID: "cafebabe", Title: "Another todo", Status: "in_progress_with_long_status", Tags: []string{"a very long tag that must be clipped"}, Body: "Second body"},
		}}
		assertFits(t, app.View(), width, height)
		if !strings.Contains(app.View(), "› ") || !strings.Contains(app.View(), "Search:") {
			t.Fatal("selection or search missing from styled list")
		}
		app = testKey(app, runeKey('/'))
		app = testKey(app, runeKey('z'))
		if !strings.Contains(app.View(), "No matching todos") {
			t.Fatal("search empty state missing")
		}
		assertFits(t, app.View(), width, height)
		app.search, app.query = false, ""
		app.detail = true
		assertFits(t, app.View(), width, height)
		app.detail = false
		// Render an editor without touching the filesystem.
		app.editor = &editor{creating: true, fields: [3]string{"A title that goes well beyond the width of this small window", "qa, pi", "Line one\nLine two"}}
		app.editor.selectField(0)
		if !strings.Contains(app.View(), "▏") {
			t.Fatalf("title cursor hidden at width %d: %s", width, app.View())
		}
		assertFits(t, app.View(), width, height)
		app.editor.selectField(2)
		assertFits(t, app.View(), width, height)
		app.confirm = "close"
		assertFits(t, app.View(), width, height)
	}
}

func TestNoColorAndMalformedWarning(t *testing.T) {
	t.Setenv("NO_COLOR", "1")
	project := t.TempDir()
	dir := todos.Dir(project)
	if err := os.MkdirAll(dir, 0700); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "deadbeef.md"), []byte("invalid"), 0600); err != nil {
		t.Fatal(err)
	}
	app, err := newModel(project)
	if err != nil {
		t.Fatal(err)
	}
	view := app.View()
	if !strings.Contains(view, "Warning") || !strings.Contains(view, "No todos yet") || strings.Contains(view, "\x1b[") {
		t.Fatalf("no-color warning/empty state is unclear: %s", view)
	}
	assertFits(t, view, 80, 24)
}