package config

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

func TestMigrateLegacyFile(t *testing.T) {
	dir := t.TempDir()
	legacy := filepath.Join(dir, "legacy", "config.json")
	target := filepath.Join(dir, "internal", "config.json")
	content := []byte(`{"activity":"xiaodian"}`)

	if err := os.MkdirAll(filepath.Dir(legacy), 0700); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(legacy, content, 0600); err != nil {
		t.Fatal(err)
	}

	migrated, err := MigrateLegacyFile(target, legacy)
	if err != nil {
		t.Fatalf("迁移失败: %v", err)
	}
	if !migrated {
		t.Fatal("应迁移旧文件")
	}
	got, err := os.ReadFile(target)
	if err != nil {
		t.Fatal(err)
	}
	if string(got) != string(content) {
		t.Fatalf("迁移内容 = %q, want %q", got, content)
	}
	if _, err := os.Stat(legacy); err != nil {
		t.Fatalf("旧文件不应被删除: %v", err)
	}

	if err := os.WriteFile(legacy, []byte(`{"activity":"other"}`), 0600); err != nil {
		t.Fatal(err)
	}
	migrated, err = MigrateLegacyFile(target, legacy)
	if err != nil {
		t.Fatalf("重复迁移失败: %v", err)
	}
	if migrated {
		t.Fatal("目标已存在时不应覆盖迁移")
	}
	got, err = os.ReadFile(target)
	if err != nil {
		t.Fatal(err)
	}
	if string(got) != string(content) {
		t.Fatalf("目标文件被意外覆盖: %q", got)
	}
}

func TestDefaultAppPathsUseInternalDataDir(t *testing.T) {
	dir := t.TempDir()
	t.Setenv("DOUYU_DATA_DIR", dir)
	t.Setenv("DOUYU_CONFIG", "")
	t.Setenv("DOUYU_USERS", "")
	t.Setenv("DOUYU_LOG_DIR", "")
	t.Setenv("DOUYU_SUCCESS_DIR", "")

	paths := DefaultAppPaths()
	if paths.DataDir != dir {
		t.Fatalf("DataDir = %q, want %q", paths.DataDir, dir)
	}
	if paths.ConfigFile != filepath.Join(dir, "config.json") {
		t.Fatalf("ConfigFile = %q", paths.ConfigFile)
	}
	if paths.AccountFile != filepath.Join(dir, "accounts.txt") {
		t.Fatalf("AccountFile = %q", paths.AccountFile)
	}
	if paths.LogDir != filepath.Join(dir, "logs") || paths.SuccessDir != filepath.Join(dir, "success_images") {
		t.Fatalf("应用数据子目录异常: logs=%q success=%q", paths.LogDir, paths.SuccessDir)
	}
}