package server

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/google/uuid"

	"scrabble/backend/internal/account"
	"scrabble/backend/internal/game"
	"scrabble/backend/internal/ratewatch"
	"scrabble/backend/internal/session"
)

// newRoutingServer builds a Server with non-nil (zero-value) services so the
// routes register. The tests below exercise only the request-validation and
// routing layers, which return before any service method is called; full
// endpoint behaviour against real services is covered by the integration suite.
func newRoutingServer() *Server {
	return New(":0", Deps{
		Sessions: &session.Service{},
		Accounts: &account.Store{},
		Games:    &game.Service{},
	})
}

func do(t *testing.T, s *Server, method, path, body string, headers map[string]string) *httptest.ResponseRecorder {
	t.Helper()
	var rdr *strings.Reader
	if body != "" {
		rdr = strings.NewReader(body)
	} else {
		rdr = strings.NewReader("")
	}
	req := httptest.NewRequest(method, path, rdr)
	req.Header.Set("Content-Type", "application/json")
	for k, v := range headers {
		req.Header.Set(k, v)
	}
	rec := httptest.NewRecorder()
	s.Handler().ServeHTTP(rec, req)
	return rec
}

func TestProfileRequiresUserID(t *testing.T) {
	rec := do(t, newRoutingServer(), http.MethodGet, "/api/v1/user/profile", "", nil)
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("profile without X-User-ID = %d, want 401", rec.Code)
	}
}

func TestResolveSessionRejectsEmptyToken(t *testing.T) {
	rec := do(t, newRoutingServer(), http.MethodPost, "/api/v1/internal/sessions/resolve", `{}`, nil)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("resolve with empty token = %d, want 400", rec.Code)
	}
}

// TestRateLimitReportEndpoint covers the internal report route: a malformed
// body is a 400, a valid report lands in the rate watch with 204.
func TestRateLimitReportEndpoint(t *testing.T) {
	watch := ratewatch.New(ratewatch.DefaultConfig(), nil, nil)
	s := New(":0", Deps{RateWatch: watch})
	if rec := do(t, s, http.MethodPost, "/api/v1/internal/ratelimit/report", `{bad`, nil); rec.Code != http.StatusBadRequest {
		t.Fatalf("malformed report = %d, want 400", rec.Code)
	}
	body := `{"window_seconds":30,"entries":[{"class":"user","key":"` + uuid.NewString() + `","rejected":7}]}`
	if rec := do(t, s, http.MethodPost, "/api/v1/internal/ratelimit/report", body, nil); rec.Code != http.StatusNoContent {
		t.Fatalf("report = %d, want 204", rec.Code)
	}
	if eps := watch.Recent(); len(eps) != 1 || eps[0].Rejected != 7 {
		t.Fatalf("watch episodes = %+v, want one entry with rejected=7", eps)
	}
}

func TestSubmitPlayRejectsBadGameID(t *testing.T) {
	headers := map[string]string{"X-User-ID": uuid.New().String()}
	rec := do(t, newRoutingServer(), http.MethodPost, "/api/v1/user/games/not-a-uuid/play", `{}`, headers)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("submit play bad game id = %d, want 400", rec.Code)
	}
}

func TestGetDraftRequiresUserID(t *testing.T) {
	path := "/api/v1/user/games/" + uuid.New().String() + "/draft"
	rec := do(t, newRoutingServer(), http.MethodGet, path, "", nil)
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("get draft without X-User-ID = %d, want 401", rec.Code)
	}
}

func TestSaveDraftRejectsBadGameID(t *testing.T) {
	headers := map[string]string{"X-User-ID": uuid.New().String()}
	rec := do(t, newRoutingServer(), http.MethodPut, "/api/v1/user/games/not-a-uuid/draft", `{"rack_order":"","board_tiles":[]}`, headers)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("save draft bad game id = %d, want 400", rec.Code)
	}
}

func TestSaveDraftRejectsBadBody(t *testing.T) {
	headers := map[string]string{"X-User-ID": uuid.New().String()}
	path := "/api/v1/user/games/" + uuid.New().String() + "/draft"
	rec := do(t, newRoutingServer(), http.MethodPut, path, `not json`, headers)
	if rec.Code != http.StatusBadRequest {
		t.Fatalf("save draft bad body = %d, want 400", rec.Code)
	}
}
