package themes

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

	"github.com/MDietermann/ArduinoArchSetup/internal/config"
	"github.com/MDietermann/ArduinoArchSetup/internal/module"
)

type nop struct{}

func (nop) Progress(string, int, int, string) {}
func (nop) Log(string, string)                 {}

func TestThemesCopiesFiles(t *testing.T) {
	src := t.TempDir()
	if err := os.WriteFile(filepath.Join(src, "one.toml"), []byte("A"), 0o644); err != nil {
		t.Fatal(err)
	}
	os.MkdirAll(filepath.Join(src, "sub"), 0o755)
	os.WriteFile(filepath.Join(src, "sub", "two.toml"), []byte("B"), 0o644)

	home := t.TempDir()
	t.Setenv("HOME", home)
	m := New(config.ThemesConfig{Source: src})
	st, _ := m.Detect(context.Background())
	p, _ := m.Plan(context.Background(), st)
	if err := m.Apply(context.Background(), p, nop{}); err != nil {
		t.Fatal(err)
	}

	got, _ := os.ReadFile(filepath.Join(home, ".config", "archduino", "themes", "one.toml"))
	if string(got) != "A" {
		t.Fatalf("one.toml: %q", got)
	}
	got, _ = os.ReadFile(filepath.Join(home, ".config", "archduino", "themes", "sub", "two.toml"))
	if string(got) != "B" {
		t.Fatalf("two.toml: %q", got)
	}
}

func TestThemesIdempotent(t *testing.T) {
	src := t.TempDir()
	os.WriteFile(filepath.Join(src, "x.toml"), []byte("X"), 0o644)
	home := t.TempDir()
	t.Setenv("HOME", home)
	m := New(config.ThemesConfig{Source: src})
	_ = applyOnce(t, m)
	st, _ := m.Detect(context.Background())
	p, _ := m.Plan(context.Background(), st)
	if !p.IsEmpty() {
		t.Fatalf("second plan not empty: %+v", p.Actions)
	}
}

func applyOnce(t *testing.T, m Module) error {
	t.Helper()
	st, _ := m.Detect(context.Background())
	p, _ := m.Plan(context.Background(), st)
	return m.Apply(context.Background(), p, nop{})
}

var _ module.Module = Module{}