package ui

import (
	"os"
	"path/filepath"
	"testing"
	"time"

	"git.stinnesbeck.com/nils/arr-tui/internal/trakt"
)

func TestPostersOnDisk(t *testing.T) {
	d := &diskCache{dir: t.TempDir()}
	if _, ok := d.readPoster("k", false); ok {
		t.Fatal("empty cache returned a poster")
	}
	d.writePoster("k", false, []byte("SMALL"))
	d.writePoster("k", true, []byte("LARGE"))
	if data, ok := d.readPoster("k", false); !ok || string(data) != "SMALL" {
		t.Errorf("small: %q %v", data, ok)
	}
	if data, ok := d.readPoster("k", true); !ok || string(data) != "LARGE" {
		t.Errorf("large copies are kept apart: %q %v", data, ok)
	}
	if info, _ := os.Stat(filepath.Dir(d.posterPath("k", false))); info.Mode().Perm() != 0o700 {
		t.Errorf("directory mode %v", info.Mode().Perm())
	}

	// Too old: not used, and pruned.
	old := time.Now().Add(-posterTTL - time.Hour)
	_ = os.Chtimes(d.posterPath("k", false), old, old)
	if _, ok := d.readPoster("k", false); ok {
		t.Error("an expired poster was used")
	}
	d.prunePosters()
	if _, err := os.Stat(d.posterPath("k", false)); !os.IsNotExist(err) {
		t.Error("an expired poster was not pruned")
	}
	if _, ok := d.readPoster("k", true); !ok {
		t.Error("a fresh poster was pruned")
	}

	// Off: nothing is read or written.
	off := &diskCache{}
	off.writePoster("k", false, []byte("x"))
	if _, ok := off.readPoster("k", false); ok {
		t.Error("cache without a directory returned a poster")
	}
}

func TestPrunePostersKeepsTheNewestWithinTheCap(t *testing.T) {
	d := &diskCache{dir: t.TempDir()}
	big := make([]byte, posterCacheCap/2+1) // two of these do not fit
	for i, key := range []string{"oldest", "middle", "newest"} {
		d.writePoster(key, false, big)
		at := time.Now().Add(time.Duration(i-3) * time.Hour)
		_ = os.Chtimes(d.posterPath(key, false), at, at)
	}
	d.prunePosters()
	for key, want := range map[string]bool{"oldest": false, "middle": false, "newest": true} {
		if _, ok := d.readPoster(key, false); ok != want {
			t.Errorf("%s kept: %v, want %v", key, ok, want)
		}
	}
}

func TestPeopleOnDisk(t *testing.T) {
	d := &diskCache{dir: t.TempDir()}
	all := map[string]savedPeople{
		"movie:tmdb:1": {Saved: time.Now(), Cast: []trakt.Person{{Name: "A", Role: "B"}}, Leaders: []trakt.Person{{Name: "C"}}},
		"movie:tmdb:2": {Saved: time.Now().Add(-peopleTTL - time.Hour), Cast: []trakt.Person{{Name: "Old"}}},
		"show:tvdb:3":  {Saved: time.Now()}, // Trakt had no cast: remembered as such
	}
	if err := d.savePeople(all); err != nil {
		t.Fatal(err)
	}
	got := d.loadPeople()
	if len(got) != 2 || got["movie:tmdb:1"].Cast[0].Role != "B" || got["movie:tmdb:1"].Leaders[0].Name != "C" {
		t.Errorf("loaded %+v", got)
	}
	if _, ok := got["show:tvdb:3"]; !ok {
		t.Error("an empty cast was not kept")
	}
	// A damaged file is ignored.
	_ = os.WriteFile(d.peoplePath(), []byte("{not json"), 0o600)
	if len(d.loadPeople()) != 0 {
		t.Error("damaged file")
	}
}

func TestPeopleCacheKeepsTheNewest(t *testing.T) {
	a := newTestApp(t)
	for i := 0; i < maxPeopleSaved+5; i++ {
		a.remember(trakt.Ref{Kind: trakt.Movies, TMDB: i + 1}.Key(), trakt.People{})
		a.people.saved[trakt.Ref{Kind: trakt.Movies, TMDB: i + 1}.Key()] = time.Unix(int64(i), 0)
	}
	a.people.timer.Stop()
	if len(a.people.done) != maxPeopleSaved {
		t.Errorf("%d casts kept", len(a.people.done))
	}
	if _, ok := a.people.done["movie:tmdb:1"]; ok {
		t.Error("the oldest cast was kept")
	}
	if !a.people.dirty || len(a.peopleSnapshot()) != maxPeopleSaved {
		t.Error("new casts must be written")
	}
}

func TestPostersOfOlderVersionsAreDropped(t *testing.T) {
	d := &diskCache{dir: t.TempDir()}
	old := filepath.Join(d.dir, "posters", "abc.img")
	if err := writeAtomic(old, []byte("v1")); err != nil {
		t.Fatal(err)
	}
	d.writePoster("k", true, []byte("v2"))
	d.prunePosters()
	if _, err := os.Stat(old); !os.IsNotExist(err) {
		t.Error("a poster of the old format was kept")
	}
	if data, ok := d.readPoster("k", true); !ok || string(data) != "v2" {
		t.Error("the current poster was dropped")
	}
}