package api

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

	"github.com/ponzischeme89/memby/server/internal/emby"
)

func TestBearerTokenSources(t *testing.T) {
	t.Run("authorization header", func(t *testing.T) {
		r := httptest.NewRequest(http.MethodGet, "/v1/home", nil)
		r.Header.Set("Authorization", "Bearer abc123")
		if got := bearerToken(r); got != "abc123" {
			t.Fatalf("got %q, want abc123", got)
		}
	})

	t.Run("query parameter for image urls", func(t *testing.T) {
		r := httptest.NewRequest(http.MethodGet, "/v1/images/1/backdrop?t=abc123", nil)
		if got := bearerToken(r); got != "abc123" {
			t.Fatalf("got %q, want abc123", got)
		}
	})

	t.Run("absent", func(t *testing.T) {
		r := httptest.NewRequest(http.MethodGet, "/v1/home", nil)
		if got := bearerToken(r); got != "" {
			t.Fatalf("got %q, want empty", got)
		}
	})
}

func TestHashTokenIsStable(t *testing.T) {
	a, b := hashToken("token"), hashToken("token")
	if string(a) != string(b) {
		t.Fatal("hashing the same token produced different digests")
	}
	if string(a) == string(hashToken("other")) {
		t.Fatal("different tokens hashed to the same digest")
	}
}

func TestNewTokenIsUnique(t *testing.T) {
	seen := map[string]bool{}
	for range 100 {
		token, err := newToken()
		if err != nil {
			t.Fatalf("newToken: %v", err)
		}
		if seen[token] {
			t.Fatal("newToken repeated a value")
		}
		seen[token] = true
	}
}

// Empty rows must serialise as [] so kotlinx.serialization can decode them into the
// client's non-null List fields.
func TestHomeResponseEncodesEmptyRowsAsArrays(t *testing.T) {
	var resp homeResponse
	ensureSlices(&resp)

	body, err := json.Marshal(resp)
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}
	var decoded map[string]any
	if err := json.Unmarshal(body, &decoded); err != nil {
		t.Fatalf("unmarshal: %v", err)
	}
	for _, row := range []string{"continueWatching", "nextUp", "favorites", "latestMovies"} {
		if _, ok := decoded[row].([]any); !ok {
			t.Fatalf("row %q encoded as %T, want array", row, decoded[row])
		}
	}
}

// The four fixed rows must keep their order, ids and kinds: the client maps kinds onto
// card shapes and uses ids as Compose keys.
func TestBaseRowsShape(t *testing.T) {
	rows := baseRows(homeResponse{
		ContinueWatching: []json.RawMessage{json.RawMessage(`{"Id":"1"}`)},
		Favorites:        []json.RawMessage{json.RawMessage(`{"Id":"2"}`)},
	})

	if len(rows) != 4 {
		t.Fatalf("expected 4 base rows, got %d", len(rows))
	}
	wantIDs := []string{"continue", "next-up", "favorites", "latest-movies"}
	wantKinds := []string{"continue", "nextup", "favorites", "latest"}
	for i, row := range rows {
		if row.ID != wantIDs[i] {
			t.Fatalf("row %d id = %q, want %q", i, row.ID, wantIDs[i])
		}
		if row.Kind != wantKinds[i] {
			t.Fatalf("row %d kind = %q, want %q", i, row.Kind, wantKinds[i])
		}
		if row.Title == "" {
			t.Fatalf("row %d has no title", i)
		}
	}

	// The favourites row carries the items the client used to assemble itself.
	if len(rows[2].Items) != 1 {
		t.Fatalf("favourites row lost its items: %+v", rows[2])
	}
}

func TestRecommendationBuildsAreDeduplicatedPerUser(t *testing.T) {
	var builds recommendationBuilds

	if !builds.begin("user-1") {
		t.Fatal("first build should be allowed to start")
	}
	if builds.begin("user-1") {
		t.Fatal("a second concurrent build for the same user must be skipped")
	}
	if !builds.begin("user-2") {
		t.Fatal("a different user must not be blocked")
	}

	builds.done("user-1")
	if !builds.begin("user-1") {
		t.Fatal("a build should be allowed again once the previous one finished")
	}
}

func TestSummariseReadsResumePosition(t *testing.T) {
	raw := json.RawMessage(`{"Id":"42","Name":"Arrival","Type":"Movie","UserData":{"PlaybackPositionTicks":36000000000}}`)
	summary, err := emby.Summarise(raw)
	if err != nil {
		t.Fatalf("summarise: %v", err)
	}
	if summary.ID != "42" || summary.Name != "Arrival" {
		t.Fatalf("unexpected summary: %+v", summary)
	}
	if got := summary.UserData.PlaybackPositionTicks / ticksPerMillisecond; got != 3_600_000 {
		t.Fatalf("resume position = %d ms, want 3600000", got)
	}
}