package backend

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"sync/atomic"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func newGitea(t *testing.T, status int) (*httptest.Server, *atomic.Int32) {
	var calls atomic.Int32
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		calls.Add(1)
		w.WriteHeader(status)
		json.NewEncoder(w).Encode(giteaRelease{
			Id:   1,
			Name: "v1.2.3",
			Assets: []giteaAsset{
				{Name: "MusicPlayer.exe", DownloadUrl: "https://example.com/MusicPlayer.exe"},
				{Name: "MusicPlayer.x86_64", DownloadUrl: "https://example.com/MusicPlayer.x86_64"},
			},
		})
	}))
	t.Cleanup(server.Close)
	return server, &calls
}

func TestReleaseService(t *testing.T) {
	server, _ := newGitea(t, http.StatusOK)
	r := NewReleaseService(server.URL)
	ctx := context.Background()

	version, err := r.LatestVersion(ctx)
	require.NoError(t, err)
	assert.Equal(t, "v1.2.3", version)

	names, err := r.AssetNames(ctx)
	require.NoError(t, err)
	assert.Equal(t, []string{"MusicPlayer.exe", "MusicPlayer.x86_64"}, names)

	url, err := r.AssetURL(ctx, ".exe")
	require.NoError(t, err)
	assert.Equal(t, "https://example.com/MusicPlayer.exe", url)

	_, err = r.AssetURL(ctx, ".dmg")
	assert.ErrorIs(t, err, ErrNotFound)
}

func TestReleaseServiceCachesRelease(t *testing.T) {
	server, calls := newGitea(t, http.StatusOK)
	r := NewReleaseService(server.URL)
	now := time.Now()
	r.now = func() time.Time { return now }
	ctx := context.Background()

	for range 3 {
		_, err := r.LatestVersion(ctx)
		require.NoError(t, err)
	}
	assert.Equal(t, int32(1), calls.Load())

	now = now.Add(releaseCacheTTL + time.Second)
	_, err := r.LatestVersion(ctx)
	require.NoError(t, err)
	assert.Equal(t, int32(2), calls.Load())
}

func TestReleaseServiceUpstreamErrors(t *testing.T) {
	server, _ := newGitea(t, http.StatusInternalServerError)
	_, err := NewReleaseService(server.URL).LatestVersion(context.Background())
	assert.ErrorIs(t, err, ErrUpstream)

	_, err = NewReleaseService("http://127.0.0.1:1").AssetNames(context.Background())
	assert.ErrorIs(t, err, ErrUpstream)
}