package api

import (
	"encoding/json"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

// newTestSettingsStore builds an in-memory settings store with a temp file.
func NewTestSettingsStore(t *testing.T, cfg Config) *settingsStore {
	t.Helper()
	dir := t.TempDir()
	ss := LoadSettingsStore(filepath.Join(dir, "palette.db"), cfg)
	// point persistence at a temp path (dir(dbPath) == dir)
	return ss
}

func TestAdminAuth(t *testing.T) {
	s := testServer(t)
	h := s.routes()

	req := httptest.NewRequest("GET", "/admin/api/settings", nil)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != 401 {
		t.Fatalf("no key: expected 401, got %d", rec.Code)
	}

	req = httptest.NewRequest("GET", "/admin/api/settings", nil)
	req.Header.Set("X-Admin-Key", "wrong-key")
	rec = httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != 401 {
		t.Fatalf("wrong key: expected 401, got %d", rec.Code)
	}

	req = httptest.NewRequest("GET", "/admin/api/settings?key=test-admin-key", nil)
	rec = httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != 200 {
		t.Fatalf("query key: expected 200, got %d", rec.Code)
	}

	req = httptest.NewRequest("GET", "/admin/api/settings", nil)
	req.Header.Set("X-Admin-Key", "test-admin-key")
	rec = httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != 200 {
		t.Fatalf("header key: expected 200, got %d", rec.Code)
	}

	// HTML page itself is open (key entered via form)
	req = httptest.NewRequest("GET", "/admin", nil)
	rec = httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != 200 {
		t.Fatalf("admin page: expected 200, got %d", rec.Code)
	}
}

func TestAdminEnvKeyPrecedence(t *testing.T) {
	dir := t.TempDir()
	dbPath := filepath.Join(dir, "palette.db")
	t.Setenv("PALETTE_ADMIN_KEY", "envkey1234567890abcdef")
	key, err := ResolveAdminKey(dbPath)
	if err != nil {
		t.Fatal(err)
	}
	if key != "envkey1234567890abcdef" {
		t.Fatalf("env key not used: %q", key)
	}
	if _, err := os.Stat(filepath.Join(dir, "admin-key")); !os.IsNotExist(err) {
		t.Fatal("env key should not create a key file")
	}

	// unset env: file takes over
	os.Unsetenv("PALETTE_ADMIN_KEY")
	key2, err := ResolveAdminKey(dbPath)
	if err != nil {
		t.Fatal(err)
	}
	if len(key2) != 32 {
		t.Fatalf("generated key should be 32 hex chars, got %d", len(key2))
	}
	if fi, err := os.Stat(filepath.Join(dir, "admin-key")); err != nil || fi.Mode().Perm() != 0600 {
		t.Fatalf("admin-key file perms: %v err %v", fi, err)
	}
	// reuse on subsequent boots
	key3, _ := ResolveAdminKey(dbPath)
	if key3 != key2 {
		t.Fatal("persisted key not reused")
	}
}

func TestAdminSettingsRoundTrip(t *testing.T) {
	s := testServer(t)
	h := s.routes()

	post := func(body string) *httptest.ResponseRecorder {
		req := httptest.NewRequest("POST", "/admin/api/settings", strings.NewReader(body))
		req.Header.Set("X-Admin-Key", "test-admin-key")
		rec := httptest.NewRecorder()
		h.ServeHTTP(rec, req)
		return rec
	}

	rec := post(`{"rate_limit_burst": 9, "rate_limit_per_minute": 120, "max_content_bytes": 1024, "default_expiry": "1h", "custom_slug_reservation_days": 10, "burn_viewer_window_minutes": 7}`)
	if rec.Code != 200 {
		t.Fatalf("post settings: %d %s", rec.Code, rec.Body.String())
	}
	got := s.settings.get()
	if got.RateLimitBurst != 9 || got.RateLimitPerMinute != 120 || got.MaxContentBytes != 1024 ||
		got.DefaultExpiry != "1h" || got.CustomSlugReservationDays != 10 || got.BurnViewerWindowMinutes != 7 {
		t.Fatalf("settings not applied: %+v", got)
	}

	// persisted to disk
	b, err := os.ReadFile(s.settings.path)
	if err != nil {
		t.Fatal(err)
	}
	var persisted Settings
	if err := json.Unmarshal(b, &persisted); err != nil {
		t.Fatal(err)
	}
	if persisted.BurnViewerWindowMinutes != 7 {
		t.Fatalf("persisted settings wrong: %+v", persisted)
	}

	// invalid rejected
	if rec := post(`{"rate_limit_burst": -1}`); rec.Code != 400 {
		t.Fatalf("invalid settings: expected 400, got %d", rec.Code)
	}
	if rec := post(`{"rate_limit_burst": 5, "rate_limit_per_minute": 60, "max_content_bytes": 1024, "default_expiry": "bogus", "custom_slug_reservation_days": 10, "burn_viewer_window_minutes": 5}`); rec.Code != 400 {
		t.Fatalf("bad expiry: expected 400, got %d", rec.Code)
	}

	// settings actually consumed: default expiry applied on create
	req := httptest.NewRequest("POST", "/api/pastes", strings.NewReader(`{"content":"x"}`))
	rec = httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != 201 {
		t.Fatalf("create: %d %s", rec.Code, rec.Body.String())
	}
	var created struct {
		ExpiresAt *int64 `json:"expires_at"`
	}
	json.Unmarshal(rec.Body.Bytes(), &created)
	if created.ExpiresAt == nil {
		t.Fatal("default expiry not applied to new paste")
	}
}

func TestAdminResetKey(t *testing.T) {
	dir := t.TempDir()
	dbPath := filepath.Join(dir, "palette.db")
	os.Unsetenv("PALETTE_ADMIN_KEY")
	key1, _ := ResolveAdminKey(dbPath)
	// direct invocation of the reset behavior
	ResetAdminKeyFile(dbPath)
	key2, _ := ResolveAdminKey(dbPath)
	if key1 == key2 {
		t.Fatal("reset did not regenerate key")
	}
}