package api

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"

	"github.com/go-chi/chi/v5"
)

// Generic registry-driven system-playlist endpoints (#411 R2).
// Replaces the former per-kind refresh handler tests.
func newSystemPlaylistRouter(h *handlers) chi.Router {
	r := chi.NewRouter()
	r.Route("/api", func(api chi.Router) {
		// No real auth.RequireUser middleware: like every other api
		// handler test, auth is supplied via withUser() context and the
		// handlers self-guard with requireUser() (prelude.go). The real
		// middleware needs a live session and would 401 the injected
		// test user.
		api.Post("/playlists/system/{kind}/refresh", h.handleSystemPlaylistRefresh)
		api.Get("/playlists/system/{kind}/shuffle", h.handleSystemPlaylistShuffle)
	})
	return r
}

func TestSystemRefresh_ForYou_Returns200(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "sysforyou", "pw", false)

	req := httptest.NewRequest(http.MethodPost, "/api/playlists/system/for_you/refresh", nil)
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newSystemPlaylistRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	var resp systemRefreshResp
	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if resp.TrackIDs == nil {
		t.Errorf("track_ids = nil, want [] (empty array, not null)")
	}
	if int(resp.TrackCount) != len(resp.TrackIDs) {
		t.Errorf("track_count=%d, len(track_ids)=%d — mismatch", resp.TrackCount, len(resp.TrackIDs))
	}
}

func TestSystemRefresh_Discover_Returns200(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "sysdiscover", "pw", false)

	req := httptest.NewRequest(http.MethodPost, "/api/playlists/system/discover/refresh", nil)
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newSystemPlaylistRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	var resp systemRefreshResp
	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if resp.TrackCount < 0 {
		t.Errorf("track_count = %d, want >= 0", resp.TrackCount)
	}
}

// A non-singleton (songs_like_artist) or unknown kind isn't
// addressable by the generic endpoints → 404, not a build.
func TestSystemRefresh_NonSingletonKind_Returns404(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	user := seedUser(t, pool, "sysbadkind", "pw", false)

	for _, kind := range []string{"songs_like_artist", "bogus"} {
		req := httptest.NewRequest(http.MethodPost, "/api/playlists/system/"+kind+"/refresh", nil)
		req = withUser(req, user)
		rec := httptest.NewRecorder()
		newSystemPlaylistRouter(h).ServeHTTP(rec, req)
		if rec.Code != http.StatusNotFound {
			t.Errorf("kind=%s: status = %d, want 404", kind, rec.Code)
		}
	}
}

func TestSystemRefresh_NoAuth_Returns401(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, _ := testHandlers(t)

	req := httptest.NewRequest(http.MethodPost, "/api/playlists/system/for_you/refresh", nil)
	rec := httptest.NewRecorder()
	newSystemPlaylistRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Errorf("status = %d, want 401", rec.Code)
	}
}
