// login_test.go 驗證 login 指令：list/add/default/remove 的輸出、
// 驗證流程（先 GET /user 再寫入）、401 不寫檔、token 不外洩。
package cli

import (
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"sync/atomic"
	"testing"

	"gitea.alterminal.com/alterminal/teai/internal/gitea"
)

// loginTestEnv 建立測試環境：臨時組態檔路徑 + 可替換的 stdin。
func loginTestEnv(t *testing.T, configContent string) (args []string, configPath string) {
	t.Helper()
	dir := t.TempDir()
	configPath = filepath.Join(dir, "config.yml")
	if configContent != "" {
		if err := os.WriteFile(configPath, []byte(configContent), 0o600); err != nil {
			t.Fatal(err)
		}
	}
	t.Setenv("TEA_CONFIG", configPath)
	return []string{"--config", configPath}, configPath
}

// newAPIServer 建立假的 Gitea API：/user 檢查 Authorization。
func newAPIServer(t *testing.T, wantToken string, status int) (*httptest.Server, *atomic.Value) {
	t.Helper()
	var gotAuth atomic.Value
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		gotAuth.Store(r.Header.Get("Authorization"))
		if r.URL.Path != "/api/v1/user" {
			w.WriteHeader(http.StatusNotFound)
			return
		}
		if status != 0 {
			w.WriteHeader(status)
			return
		}
		fmt.Fprint(w, `{"login":"ceo"}`)
	}))
	t.Cleanup(srv.Close)
	return srv, &gotAuth
}

func TestLoginListJSONNoToken(t *testing.T) {
	prefix, _ := loginTestEnv(t, `logins:
    - name: alterminal
      url: https://gitea.alterminal.com
      token: super-secret
      default: true
      user: ceo
`)
	stdout, _, code := run(append(prefix, "login", "list")...)
	if code != 0 {
		t.Fatalf("code = %d", code)
	}
	if !strings.Contains(stdout, `"name":"alterminal"`) || !strings.Contains(stdout, `"user":"ceo"`) {
		t.Fatalf("unexpected output: %s", stdout)
	}
	if strings.Contains(stdout, "super-secret") || strings.Contains(stdout, "token") {
		t.Fatalf("token leaked: %s", stdout)
	}
}

func TestLoginListEmpty(t *testing.T) {
	prefix, path := loginTestEnv(t, "")
	if _, err := os.Stat(path); err == nil {
		t.Fatal("precondition: config should not exist")
	}
	stdout, _, code := run(append(prefix, "login", "list")...)
	if code != 0 {
		t.Fatalf("code = %d", code)
	}
	if strings.TrimSpace(stdout) != "[]" {
		t.Fatalf("want [], got %q", stdout)
	}
}

func TestLoginAddVerifiesThenWrites(t *testing.T) {
	srv, gotAuth := newAPIServer(t, "tok-xyz", 0)
	prefix, configPath := loginTestEnv(t, "")
	stdout, _, code := run(append(prefix,
		"--url", srv.URL, "login", "add", "--name", "test-site", "--token", "tok-xyz")...)
	if code != 0 {
		t.Fatalf("code = %d, stdout = %s", code, stdout)
	}
	if got := gotAuth.Load(); got != "token tok-xyz" {
		t.Fatalf("server saw Authorization %v", got)
	}
	if !strings.Contains(stdout, `"name":"test-site"`) || !strings.Contains(stdout, `"user":"ceo"`) {
		t.Fatalf("unexpected output: %s", stdout)
	}
	if strings.Contains(stdout, "tok-xyz") {
		t.Fatalf("token leaked: %s", stdout)
	}
	// 寫入的組態可被解析，且欄位齊全。
	data, err := os.ReadFile(configPath)
	if err != nil {
		t.Fatal(err)
	}
	logins := gitea.ListLogins(data)
	if len(logins) != 1 {
		t.Fatalf("want 1 login, got %d:\n%s", len(logins), data)
	}
	l := logins[0]
	if l.Name != "test-site" || l.URL != srv.URL || l.Token != "tok-xyz" || !l.Default || l.User != "ceo" {
		t.Fatalf("entry mismatch: %+v", l)
	}
	info, _ := os.Stat(configPath)
	if info.Mode().Perm() != 0o600 {
		t.Fatalf("perm = %v", info.Mode().Perm())
	}
}

func TestLoginAddTokenFromStdin(t *testing.T) {
	srv, _ := newAPIServer(t, "stdin-tok", 0)
	prefix, configPath := loginTestEnv(t, "")
	old := loginStdin
	loginStdin = strings.NewReader("stdin-tok\n")
	defer func() { loginStdin = old }()
	stdout, _, code := run(append(prefix, "--url", srv.URL, "login", "add")...)
	if code != 0 {
		t.Fatalf("code = %d, stdout = %s", code, stdout)
	}
	data, _ := os.ReadFile(configPath)
	if l := gitea.ListLogins(data); len(l) != 1 || l[0].Token != "stdin-tok" {
		t.Fatalf("stdin token not saved:\n%s", data)
	}
}

func TestLoginAddRejected401NoWrite(t *testing.T) {
	srv, _ := newAPIServer(t, "", http.StatusUnauthorized)
	prefix, configPath := loginTestEnv(t, `logins:
    - name: keep
      url: https://keep.example.com
      token: keep-tok
      default: true
`)
	_, stderr, code := run(append(prefix,
		"--url", srv.URL, "login", "add", "--token", "bad-tok")...)
	// 401 是 API 錯誤；對照 README「輸出與結束碼」＝3（#10）。
	if code != 3 {
		t.Fatalf("401 should exit 3 (README api error), got %d (stderr %s)", code, stderr)
	}
	if !strings.Contains(stderr, "401") {
		t.Fatalf("stderr should mention 401: %s", stderr)
	}
	// 組態不受影響。
	data, _ := os.ReadFile(configPath)
	if l := gitea.ListLogins(data); len(l) != 1 || l[0].Token != "keep-tok" {
		t.Fatalf("config must be untouched:\n%s", data)
	}
}

func TestLoginAddUpdatesExistingInPlace(t *testing.T) {
	srv, _ := newAPIServer(t, "new-tok", 0)
	prefix, configPath := loginTestEnv(t, `logins:
    - name: alterminal
      url: `+srv.URL+`
      token: old-tok
      default: true
      user: someone-else
      ssh_key: "keep-me"
preferences:
    editor: false
`)
	stdout, _, code := run(append(prefix, "--url", srv.URL, "login", "add", "--token", "new-tok")...)
	if code != 0 {
		t.Fatalf("code = %d, out = %s", code, stdout)
	}
	data, _ := os.ReadFile(configPath)
	s := string(data)
	// 未給 --name：同站既有項目（name: alterminal）就地更新，不新增重複項目。
	if strings.Contains(stdout, `"name":"127.0.0.1:`) {
		t.Fatalf("should reuse existing entry name, got %s", stdout)
	}
	if !strings.Contains(s, "- name: alterminal") {
		t.Fatalf("existing entry name lost:\n%s", s)
	}
	if strings.Contains(s, "old-tok") || !strings.Contains(s, "token: new-tok") {
		t.Fatalf("token not replaced:\n%s", s)
	}
	if !strings.Contains(s, `ssh_key: "keep-me"`) || !strings.Contains(s, "editor: false") {
		t.Fatalf("unrelated content lost:\n%s", s)
	}
	if !strings.Contains(s, "user: ceo") {
		t.Fatalf("user not refreshed:\n%s", s)
	}
}

func TestLoginDefaultAndRemove(t *testing.T) {
	cfg := `logins:
    - name: a
      url: https://a.example.com
      token: ta
      default: true
    - name: b
      url: https://b.example.com
      token: tb
      default: false
`
	prefix, configPath := loginTestEnv(t, cfg)
	stdout, _, code := run(append(prefix, "login", "default", "b")...)
	if code != 0 || !strings.Contains(stdout, `"name":"b"`) {
		t.Fatalf("default failed: code=%d out=%s", code, stdout)
	}
	data, _ := os.ReadFile(configPath)
	if l := gitea.ListLogins(data); !l[1].Default || l[0].Default {
		t.Fatalf("default not switched:\n%s", data)
	}

	// remove --yes：移除預設者 b，a 遞補。
	stdout, _, code = run(append(prefix, "login", "remove", "--yes", "b")...)
	if code != 0 || !strings.Contains(stdout, `"name":"b"`) {
		t.Fatalf("remove failed: code=%d out=%s", code, stdout)
	}
	data, _ = os.ReadFile(configPath)
	if l := gitea.ListLogins(data); len(l) != 1 || l[0].Name != "a" || !l[0].Default {
		t.Fatalf("promote failed:\n%s", data)
	}
}

func TestLoginRemoveAsksConfirmation(t *testing.T) {
	prefix, _ := loginTestEnv(t, `logins:
    - name: a
      url: https://a.example.com
      token: ta
      default: true
`)
	old := loginStdin
	loginStdin = strings.NewReader("n\n")
	defer func() { loginStdin = old }()
	_, _, code := run(append(prefix, "login", "remove", "a")...)
	if code != 0 {
		t.Fatalf("cancel should still exit 0, got %d", code)
	}
	// 取消：檔案不變（token 仍在）。
	data, _ := os.ReadFile(filepath.Dir(prefix[1]) + "/config.yml")
	if !strings.Contains(string(data), "token: ta") {
		t.Fatalf("cancelled remove must not write:\n%s", data)
	}
}

func TestLoginUnknownSubcommandUsage(t *testing.T) {
	prefix, _ := loginTestEnv(t, "")
	_, stderr, code := run(append(prefix, "login", "bogus")...)
	// 對照 README「輸出與結束碼」：用法錯誤＝2（#10）。
	if code != 2 {
		t.Fatalf("want exit 2 (README usage), got %d", code)
	}
	if !strings.Contains(stderr, "unknown login subcommand") {
		t.Fatalf("stderr: %s", stderr)
	}
}

func TestLoginNoSubcommandUsage(t *testing.T) {
	prefix, _ := loginTestEnv(t, "")
	_, stderr, code := run(append(prefix, "login")...)
	// 對照 README「輸出與結束碼」：用法錯誤＝2（#10）。
	if code != 2 {
		t.Fatalf("want exit 2 (README usage), got %d", code)
	}
	if !strings.Contains(stderr, "subcommand") {
		t.Fatalf("stderr: %s", stderr)
	}
}

func TestLoginRemoveNotFound(t *testing.T) {
	prefix, _ := loginTestEnv(t, "logins: []\n")
	_, stderr, code := run(append(prefix, "login", "remove", "--yes", "ghost")...)
	// ExitInternal 不在 README 保證範圍；此處固定為 1（內部錯誤，#10）。
	if code != 1 {
		t.Fatalf("want exit 1 (internal), got %d", code)
	}
	if !strings.Contains(stderr, `login "ghost" not found`) {
		t.Fatalf("stderr: %s", stderr)
	}
}

func TestLoginRegisteredInUsage(t *testing.T) {
	stdout, _, code := run()
	if code != 0 || !strings.Contains(stdout, "login") {
		t.Fatalf("usage should list login: %s", stdout)
	}
}