package httpapi

import (
	"context"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	postgresstore "knowledge-governance/internal/platform/postgres"
)

func TestDingtalkSessionProxyRelaysSidecarStates(t *testing.T) {
	sidecar := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case r.Method == http.MethodPost && r.URL.Path == "/sessions":
			w.WriteHeader(http.StatusCreated)
			_ = json.NewEncoder(w).Encode(map[string]any{"id": "abc123", "state": "qr", "created_at": 1, "expires_at": 2})
		case r.Method == http.MethodGet && r.URL.Path == "/sessions/abc123":
			_ = json.NewEncoder(w).Encode(map[string]any{"id": "abc123", "state": "success"})
		case r.Method == http.MethodGet && r.URL.Path == "/sessions/missing":
			w.WriteHeader(http.StatusNotFound)
			_, _ = w.Write([]byte(`{"error":"session_not_found"}`))
		default:
			w.WriteHeader(http.StatusNotFound)
		}
	}))
	defer sidecar.Close()
	t.Setenv("DINGTALK_LOGIN_SIDECAR_URL", sidecar.URL)

	start := httptest.NewRequest(http.MethodPost, "/api/v1/dingtalk-session", strings.NewReader(`{}`))
	start = start.WithContext(context.WithValue(start.Context(), sessionKey{}, sessionIdentity{Username: "tester", Role: roleAdmin}))
	rec := httptest.NewRecorder()
	startDingtalkSession(rec, start)
	if rec.Code != http.StatusCreated {
		t.Fatalf("start proxy status = %d body=%s", rec.Code, rec.Body.String())
	}
	var created map[string]any
	if err := json.Unmarshal(rec.Body.Bytes(), &created); err != nil {
		t.Fatal(err)
	}
	if created["state"] != "qr" {
		t.Fatalf("relayed state = %v", created["state"])
	}

	poll := httptest.NewRequest(http.MethodGet, "/api/v1/dingtalk-session/abc123", nil)
	poll = poll.WithContext(context.WithValue(poll.Context(), sessionKey{}, sessionIdentity{Username: "tester", Role: roleAdmin}))
	poll.SetPathValue("id", "abc123")
	rec = httptest.NewRecorder()
	getDingtalkSession(rec, poll)
	if !strings.Contains(rec.Body.String(), `"success"`) {
		t.Fatalf("poll body = %s", rec.Body.String())
	}

	missing := httptest.NewRequest(http.MethodGet, "/api/v1/dingtalk-session/missing", nil)
	missing = missing.WithContext(context.WithValue(missing.Context(), sessionKey{}, sessionIdentity{Username: "tester", Role: roleAdmin}))
	missing.SetPathValue("id", "missing")
	rec = httptest.NewRecorder()
	getDingtalkSession(rec, missing)
	if rec.Code != http.StatusNotFound {
		t.Fatalf("missing status = %d", rec.Code)
	}
}

func TestDingtalkSessionRejectsUnauthenticatedAndHostileIDs(t *testing.T) {
	rec := httptest.NewRecorder()
	startDingtalkSession(rec, httptest.NewRequest(http.MethodPost, "/api/v1/dingtalk-session", nil))
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("unauthenticated start = %d, want 401", rec.Code)
	}
	if got := safeSessionID("../etc/passwd"); got != "" {
		t.Fatalf("hostile id accepted: %q", got)
	}
	for _, test := range []struct{ raw, want string }{
		{"https://alidocs.dingtalk.com/i/spaces/9JOGOQneRgkneX4Q/overview?rnd=1", "9JOGOQneRgkneX4Q"},
		{"9JOGOQneRgkneX4Q", "9JOGOQneRgkneX4Q"},
		{"https://example.com/not-a-space", ""},
	} {
		if got := extractDingtalkSpaceID(test.raw); got != test.want {
			t.Fatalf("extractDingtalkSpaceID(%q) = %q, want %q", test.raw, got, test.want)
		}
	}
}

func TestDingtalkSessionUnavailableWithoutSidecar(t *testing.T) {
	t.Setenv("DINGTALK_LOGIN_SIDECAR_URL", "")
	req := httptest.NewRequest(http.MethodGet, "/api/v1/dingtalk-session/abc", nil)
	req = req.WithContext(context.WithValue(req.Context(), sessionKey{}, sessionIdentity{Username: "tester", Role: roleAdmin}))
	req.SetPathValue("id", "abc")
	rec := httptest.NewRecorder()
	getDingtalkSession(rec, req)
	if rec.Code != http.StatusServiceUnavailable {
		t.Fatalf("sidecar down status = %d, want 503", rec.Code)
	}
}

// 登记失败必须能被分类：同名来源仍在用 / 同键换空间 是两种不同的冲突，
// 数据库内部故障不能伪装成"冲突"（否则线上只能看到一个无细节的 409）。
type fakeDingtalkRegistrar struct {
	*fakeJobStore
	err error
}

func (f *fakeDingtalkRegistrar) RegisterDingtalkSpace(ctx context.Context, in postgresstore.RegisterDingtalkSpaceInput) (string, error) {
	if f.err != nil {
		return "", f.err
	}
	return in.ConnectionID(), nil
}

func TestDingtalkSpaceRegistrationErrorClassification(t *testing.T) {
	sidecar := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method == http.MethodPost && r.URL.Path == "/spaces/add" {
			_ = json.NewEncoder(w).Encode(map[string]any{"key": "support-kb", "name": "公司级技术支持知识库", "root": "root-support"})
			return
		}
		w.WriteHeader(http.StatusNotFound)
	}))
	defer sidecar.Close()
	t.Setenv("DINGTALK_LOGIN_SIDECAR_URL", sidecar.URL)

	call := func(storeErr error) (int, string) {
		store := &fakeDingtalkRegistrar{fakeJobStore: &fakeJobStore{}, err: storeErr}
		handler, err := NewHandler(Config{Store: store})
		if err != nil {
			t.Fatalf("NewHandler() error = %v", err)
		}
		request := httptest.NewRequest(http.MethodPost, "/api/v1/dingtalk-spaces", strings.NewReader(`{"url":"https://alidocs.dingtalk.com/i/spaces/9JOK9EEOMLMWX4Q"}`))
		request.Header.Set("X-Governance-Action", "dingtalk-space")
		request.Header.Set("Idempotency-Key", "op-dingtalk-register")
		request = request.WithContext(context.WithValue(request.Context(), sessionKey{}, sessionIdentity{Username: "yaozhanghao", Role: roleAdmin}))
		recorder := httptest.NewRecorder()
		handler.ServeHTTP(recorder, request)
		return recorder.Code, recorder.Body.String()
	}

	status, body := call(postgresstore.ErrDingtalkSpaceNameTaken)
	if status != http.StatusConflict || !strings.Contains(body, "space_name_conflict") || !strings.Contains(body, "去掉来源") {
		t.Fatalf("同名冲突 = %d %s", status, body)
	}
	status, body = call(postgresstore.ErrDingtalkSpaceIdentityConflict)
	if status != http.StatusConflict || !strings.Contains(body, "space_identity_conflict") {
		t.Fatalf("同键冲突 = %d %s", status, body)
	}
	status, body = call(errors.New("connection refused: password=hunter2"))
	if status != http.StatusInternalServerError || !strings.Contains(body, "space_registration_failed") || strings.Contains(body, "hunter2") {
		t.Fatalf("内部故障 = %d %s（且不得回显细节）", status, body)
	}
	// 正常路径仍然成功（别把好的也拦掉）。
	status, body = call(nil)
	if status != http.StatusCreated || !strings.Contains(body, "connection_id") {
		t.Fatalf("正常登记 = %d %s", status, body)
	}
}