package todo

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

func TestBootstrapCreatesStructure(t *testing.T) {
	tmpDir := t.TempDir()
	origDir, _ := os.Getwd()
	if err := os.Chdir(tmpDir); err != nil {
		t.Fatal(err)
	}
	defer func() { _ = os.Chdir(origDir) }()

	if err := Bootstrap(); err != nil {
		t.Fatalf("Bootstrap failed: %v", err)
	}

	// Verify directories
	for _, dir := range []string{"todo/queued", "todo/doing", "todo/completed"} {
		info, err := os.Stat(dir)
		if err != nil {
			t.Errorf("expected %s to exist: %v", dir, err)
			continue
		}
		if !info.IsDir() {
			t.Errorf("expected %s to be a directory", dir)
		}
	}

	// Verify README
	data, err := os.ReadFile("todo/README.md")
	if err != nil {
		t.Fatalf("expected todo/README.md to exist: %v", err)
	}
	content := string(data)
	if !strings.Contains(content, "## Queued") {
		t.Error("README missing ## Queued heading")
	}
	if !strings.Contains(content, "## Completed") {
		t.Error("README missing ## Completed heading")
	}
}

func TestBootstrapIdempotent(t *testing.T) {
	tmpDir := t.TempDir()
	origDir, _ := os.Getwd()
	if err := os.Chdir(tmpDir); err != nil {
		t.Fatal(err)
	}
	defer func() { _ = os.Chdir(origDir) }()

	// Run twice
	if err := Bootstrap(); err != nil {
		t.Fatalf("first Bootstrap failed: %v", err)
	}
	if err := Bootstrap(); err != nil {
		t.Fatalf("second Bootstrap failed: %v", err)
	}

	// Verify structure still intact
	for _, dir := range []string{"todo/queued", "todo/doing", "todo/completed"} {
		if _, err := os.Stat(dir); err != nil {
			t.Errorf("expected %s to exist after second Bootstrap: %v", dir, err)
		}
	}
}

func TestBootstrapPreservesExistingReadme(t *testing.T) {
	tmpDir := t.TempDir()
	origDir, _ := os.Getwd()
	if err := os.Chdir(tmpDir); err != nil {
		t.Fatal(err)
	}
	defer func() { _ = os.Chdir(origDir) }()

	// Create structure with custom README
	if err := os.MkdirAll("todo", 0755); err != nil {
		t.Fatal(err)
	}
	customContent := "# My Custom TODO\n\nCustom content here.\n"
	if err := os.WriteFile("todo/README.md", []byte(customContent), 0644); err != nil {
		t.Fatal(err)
	}

	if err := Bootstrap(); err != nil {
		t.Fatalf("Bootstrap failed: %v", err)
	}

	// Verify custom README was not overwritten
	data, err := os.ReadFile("todo/README.md")
	if err != nil {
		t.Fatal(err)
	}
	if string(data) != customContent {
		t.Errorf("Bootstrap overwrote existing README.\ngot: %q\nwant: %q", string(data), customContent)
	}
}

func TestBootstrapCreatesReadmeWithCorrectPermissions(t *testing.T) {
	tmpDir := t.TempDir()
	origDir, _ := os.Getwd()
	if err := os.Chdir(tmpDir); err != nil {
		t.Fatal(err)
	}
	defer func() { _ = os.Chdir(origDir) }()

	if err := Bootstrap(); err != nil {
		t.Fatal(err)
	}

	info, err := os.Stat(filepath.Join("todo", "README.md"))
	if err != nil {
		t.Fatal(err)
	}
	perm := info.Mode().Perm()
	if perm != 0644 {
		t.Errorf("README permissions = %o, want 0644", perm)
	}
}