package assets

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

func touch(t *testing.T, path string) {
	t.Helper()
	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(path, []byte("x"), 0o644); err != nil {
		t.Fatal(err)
	}
}

func TestCheckDupes(t *testing.T) {
	root := t.TempDir()
	touch(t, filepath.Join(root, "tex", "Foo.tga"))
	touch(t, filepath.Join(root, "plc", "foo.tga")) // basename collision (case-insensitive)

	var out, errw bytes.Buffer
	if code := runCheckDupes([]string{root}, &out, &errw); code != exitFail {
		t.Fatalf("collision exit = %d, want %d\n%s", code, exitFail, errw.String())
	}

	clean := t.TempDir()
	touch(t, filepath.Join(clean, "a.tga"))
	touch(t, filepath.Join(clean, "sub", "b.tga"))
	out.Reset()
	errw.Reset()
	if code := runCheckDupes([]string{clean}, &out, &errw); code != exitOK {
		t.Fatalf("no-collision exit = %d, want %d\n%s", code, exitOK, errw.String())
	}
}

func TestCleanDupes(t *testing.T) {
	primary := t.TempDir()
	clean := t.TempDir()
	touch(t, filepath.Join(primary, "keep.tga"))
	collide := filepath.Join(clean, "sub", "Keep.tga")
	survive := filepath.Join(clean, "unique.tga")
	touch(t, collide)
	touch(t, survive)

	// dry-run removes nothing.
	var out, errw bytes.Buffer
	if code := runCleanDupes([]string{"--dry-run", primary, clean}, &out, &errw); code != exitOK {
		t.Fatalf("dry-run exit = %d\n%s", code, errw.String())
	}
	if _, err := os.Stat(collide); err != nil {
		t.Fatal("dry-run deleted a file")
	}

	// real run deletes the collision, keeps the unique file.
	out.Reset()
	errw.Reset()
	if code := runCleanDupes([]string{primary, clean}, &out, &errw); code != exitOK {
		t.Fatalf("clean exit = %d\n%s", code, errw.String())
	}
	if _, err := os.Stat(collide); !os.IsNotExist(err) {
		t.Fatal("collision file was not deleted")
	}
	if _, err := os.Stat(survive); err != nil {
		t.Fatal("unique file was wrongly deleted")
	}
}

func TestCleanDupesRejectsOverlap(t *testing.T) {
	root := t.TempDir()
	sub := filepath.Join(root, "child")
	touch(t, filepath.Join(sub, "x.tga"))
	var out, errw bytes.Buffer
	if code := runCleanDupes([]string{root, sub}, &out, &errw); code != exitUsage {
		t.Fatalf("overlap exit = %d, want %d", code, exitUsage)
	}
}