package api

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

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

func newRadioRouter(h *handlers) chi.Router {
	r := chi.NewRouter()
	r.Get("/api/radio", h.handleRadio)
	return r
}

func TestHandleRadio_Stub_ReturnsSeedOnly(t *testing.T) {
	h, pool := testHandlers(t)
	truncateLibrary(t, pool)
	artist := seedArtist(t, pool, "Beatles")
	album := seedAlbum(t, pool, artist.ID, "Abbey Road", 1969)
	track := seedTrack(t, pool, album.ID, artist.ID, "Something", 3, 183_000)

	req := httptest.NewRequest(http.MethodGet, "/api/radio?seed_track="+uuidToString(track.ID), nil)
	w := httptest.NewRecorder()
	newRadioRouter(h).ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("status = %d body=%s", w.Code, w.Body.String())
	}
	var got struct {
		Tracks []TrackRef `json:"tracks"`
	}
	if err := json.Unmarshal(w.Body.Bytes(), &got); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if len(got.Tracks) != 1 {
		t.Fatalf("len=%d, want 1", len(got.Tracks))
	}
	if got.Tracks[0].Title != "Something" {
		t.Errorf("title=%q", got.Tracks[0].Title)
	}
	if got.Tracks[0].AlbumTitle != "Abbey Road" || got.Tracks[0].ArtistName != "Beatles" {
		t.Errorf("ref = %+v", got.Tracks[0])
	}
}

func TestHandleRadio_NotFound(t *testing.T) {
	h, pool := testHandlers(t)
	truncateLibrary(t, pool)

	req := httptest.NewRequest(http.MethodGet, "/api/radio?seed_track=00000000-0000-0000-0000-000000000000", nil)
	w := httptest.NewRecorder()
	newRadioRouter(h).ServeHTTP(w, req)

	if w.Code != http.StatusNotFound {
		t.Fatalf("status = %d", w.Code)
	}
}

func TestHandleRadio_MissingSeed(t *testing.T) {
	h, _ := testHandlers(t)
	req := httptest.NewRequest(http.MethodGet, "/api/radio", nil)
	w := httptest.NewRecorder()
	newRadioRouter(h).ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Errorf("status=%d, want 400", w.Code)
	}
}

func TestHandleRadio_BlankSeed(t *testing.T) {
	h, _ := testHandlers(t)
	req := httptest.NewRequest(http.MethodGet, "/api/radio?seed_track=%20%20", nil)
	w := httptest.NewRecorder()
	newRadioRouter(h).ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Errorf("status=%d, want 400", w.Code)
	}
}

func TestHandleRadio_BadUUID(t *testing.T) {
	h, _ := testHandlers(t)
	req := httptest.NewRequest(http.MethodGet, "/api/radio?seed_track=not-a-uuid", nil)
	w := httptest.NewRecorder()
	newRadioRouter(h).ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Errorf("status=%d, want 400", w.Code)
	}
}