package admin

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"oneblog/internal/config"
	"oneblog/internal/db"
	"oneblog/internal/model"
	"oneblog/internal/store"
)

func newTestAPI(t *testing.T) (*API, http.Handler) {
	t.Helper()
	d, err := db.Open("sqlite", ":memory:")
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}
	t.Cleanup(func() { d.Close() })
	st, err := store.New(d)
	if err != nil {
		t.Fatalf("store: %v", err)
	}
	cfg := &config.Config{AdminUser: "admin", AdminPass: "s3cret"}
	a := NewAPI(st, cfg, NewSessions("test-secret", time.Hour))
	return a, a.Routes()
}

func login(t *testing.T, h http.Handler, user, pass string) *httptest.ResponseRecorder {
	t.Helper()
	body, _ := json.Marshal(loginRequest{Username: user, Password: pass})
	req := httptest.NewRequest(http.MethodPost, "/api/admin/login", strings.NewReader(string(body)))
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	return rec
}

func TestGuardRejectsAnonymous(t *testing.T) {
	_, h := newTestAPI(t)
	for _, path := range []string{"/api/admin/posts", "/api/admin/settings", "/api/admin/dashboard"} {
		rec := httptest.NewRecorder()
		h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, path, nil))
		if rec.Code != http.StatusUnauthorized {
			t.Errorf("%s: got %d, want 401", path, rec.Code)
		}
	}
}

func TestLoginIssuesUsableSession(t *testing.T) {
	_, h := newTestAPI(t)
	rec := login(t, h, "admin", "wrong")
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("wrong password: got %d, want 401", rec.Code)
	}
	rec = login(t, h, "admin", "s3cret")
	if rec.Code != http.StatusOK {
		t.Fatalf("login: got %d, want 200", rec.Code)
	}
	var out struct {
		Token string `json:"token"`
	}
	if err := json.NewDecoder(rec.Body).Decode(&out); err != nil || out.Token == "" {
		t.Fatalf("no token in response: %v", err)
	}
	// Bearer 通道
	req := httptest.NewRequest(http.MethodGet, "/api/admin/posts", nil)
	req.Header.Set("Authorization", "Bearer "+out.Token)
	rec2 := httptest.NewRecorder()
	h.ServeHTTP(rec2, req)
	if rec2.Code != http.StatusOK {
		t.Fatalf("bearer posts: got %d, want 200", rec2.Code)
	}
	// cookie 通道
	req = httptest.NewRequest(http.MethodGet, "/api/admin/posts", nil)
	req.AddCookie(&http.Cookie{Name: "one_session", Value: out.Token})
	rec3 := httptest.NewRecorder()
	h.ServeHTTP(rec3, req)
	if rec3.Code != http.StatusOK {
		t.Fatalf("cookie posts: got %d, want 200", rec3.Code)
	}
}

func TestLoginRateLimitedAfterRepeatedFailures(t *testing.T) {
	_, h := newTestAPI(t)
	var rec *httptest.ResponseRecorder
	for i := 0; i < maxLoginFails+1; i++ {
		rec = login(t, h, "admin", "bad")
	}
	if rec.Code != http.StatusTooManyRequests {
		t.Fatalf("after %d failures: got %d, want 429", maxLoginFails+1, rec.Code)
	}
	// 限速期间即使口令正确也被拒
	rec = login(t, h, "admin", "s3cret")
	if rec.Code != http.StatusTooManyRequests {
		t.Fatalf("locked out login: got %d, want 429", rec.Code)
	}
}

func TestSecureCookieBehindTLSProxy(t *testing.T) {
	_, h := newTestAPI(t)
	body, _ := json.Marshal(loginRequest{Username: "admin", Password: "s3cret"})
	req := httptest.NewRequest(http.MethodPost, "/api/admin/login", strings.NewReader(string(body)))
	req.Header.Set("X-Forwarded-Proto", "https")
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("login: %d", rec.Code)
	}
	cookie := rec.Header().Get("Set-Cookie")
	if !strings.Contains(cookie, "Secure") {
		t.Fatalf("expected Secure flag over https proxy, got: %s", cookie)
	}
}

// ?order= 直接来自查询串并拼进 SQL，注入串必须被白名单挡掉且不影响数据。
func TestOrderParamInjectionIsNeutralized(t *testing.T) {
	a, h := newTestAPI(t)
	if _, err := a.Store.Create(model.PostInput{Title: "one", ContentMd: "a", Status: model.StatusPublished}); err != nil {
		t.Fatal(err)
	}
	token := login(t, h, "admin", "s3cret")
	var out struct {
		Token string `json:"token"`
	}
	_ = json.NewDecoder(token.Body).Decode(&out)

	req := httptest.NewRequest(http.MethodGet, "/api/admin/posts?order="+
		strings.ReplaceAll("published_at DESC; DROP TABLE posts; --", " ", "%20"), nil)
	req.Header.Set("Authorization", "Bearer "+out.Token)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("injected order: got %d body=%s", rec.Code, rec.Body.String())
	}
	// 表若被 DROP，这条查询会报错
	if _, err := a.Store.List(store.ListOptions{Status: "any"}); err != nil {
		t.Fatalf("posts table damaged: %v", err)
	}
}