package api

import (
	"strings"
	"testing"
	"time"
)

func TestRequestStatusPrefersAvailabilityOverEverything(t *testing.T) {
	// A title the household can watch is available whether or not the *arr still tracks it
	// and whether or not anything thinks it has been released. Being watchable is the
	// strongest fact there is about a request, so nothing below may override it.
	cases := []struct {
		name    string
		subject RequestSubject
	}{
		{"in library, untracked, unreleased", RequestSubject{InLibrary: true}},
		{"has file but not imported", RequestSubject{Tracked: true, HasFile: true}},
		{"in library and still being worked on", RequestSubject{
			Tracked: true, InLibrary: true, Released: true,
		}},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := requestStatusFor(tc.subject); got != RequestStatusAvailable {
				t.Fatalf("expected %q, got %q", RequestStatusAvailable, got)
			}
		})
	}
}

func TestRequestStatusReportsRemovalBeforeReleaseState(t *testing.T) {
	// An untracked title's release date says nothing: nobody is working on it either way,
	// so "unavailable" must win over "pending". Getting this the wrong way round would park
	// a removed request on "waiting for release" for ever.
	got := requestStatusFor(RequestSubject{Tracked: false, Released: false})
	if got != RequestStatusUnavailable {
		t.Fatalf("expected %q for an untracked title, got %q", RequestStatusUnavailable, got)
	}
}

func TestRequestStatusSeparatesPendingFromSearching(t *testing.T) {
	pending := requestStatusFor(RequestSubject{Tracked: true, Released: false})
	if pending != RequestStatusPending {
		t.Fatalf("expected %q, got %q", RequestStatusPending, pending)
	}
	// Tracked, released, and the download client has never heard of it: nothing has been
	// found. This is the distinction the whole feature rests on — before it, this case and
	// a download two minutes from finishing were the same word.
	searching := requestStatusFor(RequestSubject{Tracked: true, Released: true})
	if searching != RequestStatusSearching {
		t.Fatalf("expected %q, got %q", RequestStatusSearching, searching)
	}
}

func TestQueueOutranksTheReleaseState(t *testing.T) {
	// Radarr's minimum-availability setting decides when to start looking, not whether bytes
	// are moving. A household that fetches on the cinema date has films that are "not
	// released" and half downloaded at once, and the honest answer is the half.
	got := requestStatusFor(RequestSubject{
		Tracked:  true,
		Released: false,
		Progress: requestProgress{Status: RequestStatusDownloading, Progress: 50},
	})
	if got != RequestStatusDownloading {
		t.Fatalf("expected %q, got %q", RequestStatusDownloading, got)
	}
	// But nothing outranks having it. A queue row against a title already on the shelf is an
	// upgrade, and a card somebody can press Play on must not read as downloading.
	got = requestStatusFor(RequestSubject{
		Tracked:   true,
		InLibrary: true,
		Progress:  requestProgress{Status: RequestStatusDownloading, Progress: 50},
	})
	if got != RequestStatusAvailable {
		t.Fatalf("expected %q, got %q", RequestStatusAvailable, got)
	}
}

func TestCollapseNarrowsOnlyTheDownloadStates(t *testing.T) {
	// An older television is told "processing" for the whole span it used to cover, and
	// nothing else it understands is disturbed.
	for _, state := range []string{
		RequestStatusSearching, RequestStatusFound,
		RequestStatusDownloading, RequestStatusFailed,
	} {
		if got := collapseRequestStatus(state); got != RequestStatusProcessing {
			t.Fatalf("%q should collapse to %q, got %q", state, RequestStatusProcessing, got)
		}
	}
	for _, state := range []string{
		RequestStatusAvailable, RequestStatusPending, RequestStatusRequested,
		RequestStatusUnavailable, RequestStatusRequestable, RequestStatusProcessing,
	} {
		if got := collapseRequestStatus(state); got != state {
			t.Fatalf("%q must survive collapsing, got %q", state, got)
		}
	}
}

func TestLookupStatusOffersRequestableOnlyWhenNothingHasIt(t *testing.T) {
	got := lookupStatusFor(RequestSubject{}, false)
	if got != RequestStatusRequestable {
		t.Fatalf("expected %q, got %q", RequestStatusRequestable, got)
	}
	// The request list rule must never produce it: there, an untracked title is one somebody
	// removed rather than one nobody has asked for.
	if requestStatusFor(RequestSubject{}) == RequestStatusRequestable {
		t.Fatal("requestStatusFor must not return requestable")
	}
}

func TestLookupStatusPutsOwnRequestAboveHouseholdButBelowAvailability(t *testing.T) {
	// Somebody needs to be told they already asked, before being told the household happens
	// to track it — that is what stops them pressing the button again.
	mine := lookupStatusFor(RequestSubject{Tracked: true, Released: true}, true)
	if mine != RequestStatusRequested {
		t.Fatalf("expected %q for the viewer's own ask, got %q", RequestStatusRequested, mine)
	}
	// But being watchable now is better news than having asked.
	available := lookupStatusFor(RequestSubject{InLibrary: true}, true)
	if available != RequestStatusAvailable {
		t.Fatalf("expected %q, got %q", RequestStatusAvailable, available)
	}
}

func TestMovieReleasedTreatsUnknownStatusAsReleased(t *testing.T) {
	// A Radarr vocabulary this build has never seen must degrade to "processing", not park
	// the request on "pending" for ever.
	for _, status := range []string{"released", "deleted", "somethingNew", ""} {
		if !movieReleased(status) {
			t.Fatalf("expected %q to count as released", status)
		}
	}
	for _, status := range []string{"announced", "inCinemas", "INCINEMAS", " announced "} {
		if movieReleased(status) {
			t.Fatalf("expected %q to count as unreleased", status)
		}
	}
}

func TestSeriesReleasedReadsUpcomingAndFutureAirings(t *testing.T) {
	now := time.Date(2026, 8, 12, 0, 0, 0, 0, time.UTC)
	later := now.Add(48 * time.Hour)
	earlier := now.Add(-48 * time.Hour)

	if seriesReleased("upcoming", nil, now) {
		t.Fatal("an upcoming series has nothing to fetch yet")
	}
	if seriesReleased("", &later, now) {
		t.Fatal("a series whose only airing is in the future has nothing to fetch yet")
	}
	if !seriesReleased("continuing", &later, now) {
		t.Fatal("a continuing series with a future episode is still fetchable now")
	}
	if !seriesReleased("", &earlier, now) {
		t.Fatal("a series that has already aired is fetchable")
	}
}

func TestRequestStatusLabelAndDetailCoverEveryState(t *testing.T) {
	// Every state must carry its own wording: the television renders what it is handed, so
	// a state that fell through to the default would show "Requested" on a card that is
	// actually available.
	states := []string{
		RequestStatusAvailable, RequestStatusSearching, RequestStatusFound,
		RequestStatusDownloading, RequestStatusProcessing, RequestStatusPending,
		RequestStatusFailed, RequestStatusUnavailable, RequestStatusRequestable,
		RequestStatusRequested,
	}
	seen := map[string]bool{}
	for _, state := range states {
		label := requestStatusLabel(state)
		if label == "" {
			t.Fatalf("state %q has no label", state)
		}
		if seen[label] {
			t.Fatalf("state %q reuses the label %q", state, label)
		}
		seen[label] = true
	}
	for _, state := range states {
		if requestStatusDetail(state, "movie", 0) == "" {
			t.Fatalf("state %q has no detail line", state)
		}
	}
	if requestStatusDetail(RequestStatusPending, "series", 0) ==
		requestStatusDetail(RequestStatusPending, "movie", 0) {
		t.Fatal("a pending series and a pending film are waiting for different things")
	}
	// The one rule this feature is judged on: an estimate is offered when the download
	// client gave one and never otherwise. Both sentences are legitimate; saying the second
	// while holding a number, or the first while holding none, is not.
	withEstimate := requestStatusDetail(RequestStatusDownloading, "movie", 840)
	withoutEstimate := requestStatusDetail(RequestStatusDownloading, "movie", 0)
	if withEstimate == withoutEstimate {
		t.Fatal("a download with an estimate must not read the same as one without")
	}
	if !strings.Contains(withEstimate, "14 minutes") {
		t.Fatalf("840 seconds should read as about 14 minutes, got %q", withEstimate)
	}
	if strings.Contains(withoutEstimate, "~") {
		t.Fatalf("a download with no estimate must not print one, got %q", withoutEstimate)
	}
}