package service

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

	"github.com/ShukeBta/MediaStationGo/internal/model"
)

func TestSelectSiteSearchCandidatesPrefersSeriesPack(t *testing.T) {
	sub := &model.Subscription{Name: "间谍过家家 自动订阅", Filter: "间谍过家家 2022", MediaType: "tv"}
	results := []SearchResult{
		{Title: "间谍过家家 S01E01 1080p", DownloadURL: "https://pt/download/1", Seeders: 80},
		{Title: "间谍过家家 S01 Complete 1080p", DownloadURL: "https://pt/download/pack", Seeders: 50},
		{Title: "间谍过家家 S01E02 1080p", DownloadURL: "https://pt/download/2", Seeders: 70},
	}

	got := selectSiteSearchCandidates(results, sub, map[string]struct{}{})
	if len(got) != 1 {
		t.Fatalf("selected %d candidates, want 1", len(got))
	}
	if got[0].Download != "https://pt/download/pack" || !got[0].Pack {
		t.Fatalf("selected %#v, want complete pack", got[0])
	}
}

func TestSelectSiteSearchCandidatesQueuesDistinctEpisodesWhenNoPack(t *testing.T) {
	sub := &model.Subscription{Name: "葬送的芙莉莲 自动订阅", Filter: "葬送的芙莉莲", MediaType: "anime", WashEnabled: true, WashPriority: "resolution"}
	results := []SearchResult{
		{Title: "葬送的芙莉莲 S01E01 1080p", DownloadURL: "https://pt/download/1a", Seeders: 90},
		{Title: "葬送的芙莉莲 S01E01 2160p", DownloadURL: "https://pt/download/1b", Seeders: 80},
		{Title: "葬送的芙莉莲 S01E02 1080p", DownloadURL: "https://pt/download/2", Seeders: 70},
		{Title: "葬送的芙莉莲 S01E03 1080p", DownloadURL: "https://pt/download/3", Seeders: 60},
	}

	got := selectSiteSearchCandidates(results, sub, map[string]struct{}{})
	if len(got) != 3 {
		t.Fatalf("selected %d candidates, want 3", len(got))
	}
	if got[0].Episode != 1 || got[1].Episode != 2 || got[2].Episode != 3 {
		t.Fatalf("episodes = %d,%d,%d; want 1,2,3", got[0].Episode, got[1].Episode, got[2].Episode)
	}
	if got[0].Download != "https://pt/download/1b" {
		t.Fatalf("duplicate episode should keep wash-priority best result, got %q", got[0].Download)
	}
}

func TestSelectSiteSearchCandidatesKeepsMovieSingleBest(t *testing.T) {
	sub := &model.Subscription{Name: "Inception 自动订阅", Filter: "Inception 2010", MediaType: "movie", WashPriority: "seeders"}
	results := []SearchResult{
		{Title: "Inception 2010 1080p", DownloadURL: "https://pt/download/1080", Seeders: 90},
		{Title: "Inception 2010 2160p", DownloadURL: "https://pt/download/2160", Seeders: 80},
	}

	got := selectSiteSearchCandidates(results, sub, map[string]struct{}{})
	if len(got) != 1 || got[0].Download != "https://pt/download/1080" {
		t.Fatalf("selected %#v, want movie best only", got)
	}
}

func TestSelectSiteSearchCandidatesDoesNotWashByDefault(t *testing.T) {
	sub := &model.Subscription{Name: "Inception 自动订阅", Filter: "Inception 2010", MediaType: "movie", WashPriority: "resolution"}
	results := []SearchResult{
		{Title: "Inception 2010 1080p", DownloadURL: "https://pt/download/1080", Seeders: 90},
		{Title: "Inception 2010 2160p", DownloadURL: "https://pt/download/2160", Seeders: 80},
	}

	got := selectSiteSearchCandidates(results, sub, map[string]struct{}{})
	if len(got) != 1 || got[0].Download != "https://pt/download/1080" {
		t.Fatalf("selected %#v, want seeders best when wash disabled", got)
	}
}

func TestSelectSiteSearchCandidatesAppliesQualityRules(t *testing.T) {
	sub := &model.Subscription{
		Name:         "Dune 自动订阅",
		Filter:       "Dune 2021",
		MediaType:    "movie",
		Resolution:   "2160p",
		Quality:      "remux",
		Effects:      "hdr",
		ExcludeWords: "cam,ts",
	}
	results := []SearchResult{
		{Title: "Dune 2021 2160p WEB-DL HDR", DownloadURL: "https://pt/download/web", Seeders: 100},
		{Title: "Dune 2021 2160p UHD BluRay REMUX HDR", DownloadURL: "https://pt/download/remux", Seeders: 30},
		{Title: "Dune 2021 2160p REMUX HDR CAM", DownloadURL: "https://pt/download/cam", Seeders: 200},
	}

	got := selectSiteSearchCandidates(results, sub, map[string]struct{}{})
	if len(got) != 1 || got[0].Download != "https://pt/download/remux" {
		t.Fatalf("selected %#v, want filtered remux", got)
	}
}

func TestSiteSearchKeywordCanUseIMDB(t *testing.T) {
	sub := &model.Subscription{Name: "沙丘 自动订阅", Filter: "Dune 2021", SearchMode: "imdb", IMDBID: "tt1160419"}
	if got := siteSearchKeyword(sub); got != "tt1160419" {
		t.Fatalf("keyword = %q, want imdb id", got)
	}
}

func TestSelectSiteSearchCandidatesOnlyQueuesMissingLocalEpisodes(t *testing.T) {
	sub := &model.Subscription{Name: "间谍过家家 自动订阅", Filter: "间谍过家家", MediaType: "tv", TotalEpisodes: 3}
	results := []SearchResult{
		{Title: "间谍过家家 S01 Complete 1080p", DownloadURL: "https://pt/download/pack", Seeders: 100},
		{Title: "间谍过家家 S01E01 1080p", DownloadURL: "https://pt/download/1", Seeders: 90},
		{Title: "间谍过家家 S01E02 1080p", DownloadURL: "https://pt/download/2", Seeders: 80},
		{Title: "间谍过家家 S01E03 1080p", DownloadURL: "https://pt/download/3", Seeders: 70},
	}
	availability := LocalAvailability{
		TotalEpisodes:       3,
		LocalMediaCount:     2,
		MissingEpisodes:     []int{3},
		ExistingEpisodeKeys: map[string]struct{}{episodeKey(1, 1): {}, episodeKey(1, 2): {}},
	}

	got := selectSiteSearchCandidates(results, sub, map[string]struct{}{}, availability)
	if len(got) != 1 || got[0].Episode != 3 {
		t.Fatalf("selected %#v, want only missing episode 3", got)
	}
}

func TestSelectSiteSearchCandidatesWithUnknownTotalSkipsExistingEpisodes(t *testing.T) {
	sub := &model.Subscription{Name: "葬送的芙莉莲 自动订阅", Filter: "葬送的芙莉莲", MediaType: "anime"}
	results := []SearchResult{
		{Title: "葬送的芙莉莲 S01 Complete 1080p", DownloadURL: "https://pt/download/pack", Seeders: 100},
		{Title: "葬送的芙莉莲 S01E01 1080p", DownloadURL: "https://pt/download/1", Seeders: 90},
		{Title: "葬送的芙莉莲 S01E02 1080p", DownloadURL: "https://pt/download/2", Seeders: 80},
		{Title: "葬送的芙莉莲 S01E03 1080p", DownloadURL: "https://pt/download/3", Seeders: 70},
	}
	availability := LocalAvailability{
		LocalMediaCount:     2,
		ExistingEpisodeKeys: map[string]struct{}{episodeKey(1, 1): {}, episodeKey(1, 2): {}},
	}

	got := selectSiteSearchCandidates(results, sub, map[string]struct{}{}, availability)
	if len(got) != 1 || got[0].Episode != 3 {
		t.Fatalf("selected %#v, want only not-yet-local episode 3", got)
	}
}

func TestSubscriptionPendingDownloadAvailabilitySkipsUnorganizedEpisodes(t *testing.T) {
	root := t.TempDir()
	seasonDir := filepath.Join(root, "间谍过家家", "Season 01")
	if err := os.MkdirAll(seasonDir, 0o755); err != nil {
		t.Fatal(err)
	}
	for _, name := range []string{
		"间谍过家家 - S01E01.mkv",
		"间谍过家家 - S01E02.mkv.!qB",
	} {
		if err := os.WriteFile(filepath.Join(seasonDir, name), []byte("video"), 0o644); err != nil {
			t.Fatal(err)
		}
	}

	sub := &model.Subscription{
		Name:          "间谍过家家 自动订阅",
		Filter:        "间谍过家家",
		MediaType:     "tv",
		SavePath:      root,
		TotalEpisodes: 3,
	}
	svc := NewSubscriptionService(nil, nil, nil, nil, nil, nil)
	availability := svc.pendingDownloadAvailability(t.Context(), sub)
	if availability.DownloadedEpisodes != 2 {
		t.Fatalf("downloaded episodes = %d, want 2", availability.DownloadedEpisodes)
	}
	if _, ok := availability.ExistingEpisodeKeys[episodeKey(1, 1)]; !ok {
		t.Fatalf("missing pending E01 key: %#v", availability.ExistingEpisodeKeys)
	}
	if _, ok := availability.ExistingEpisodeKeys[episodeKey(1, 2)]; !ok {
		t.Fatalf("missing pending E02 key: %#v", availability.ExistingEpisodeKeys)
	}

	results := []SearchResult{
		{Title: "间谍过家家 S01 Complete 1080p", DownloadURL: "https://pt/download/pack", Seeders: 100},
		{Title: "间谍过家家 S01E01 1080p", DownloadURL: "https://pt/download/1", Seeders: 90},
		{Title: "间谍过家家 S01E02 1080p", DownloadURL: "https://pt/download/2", Seeders: 80},
		{Title: "间谍过家家 S01E03 1080p", DownloadURL: "https://pt/download/3", Seeders: 70},
	}
	got := selectSiteSearchCandidates(results, sub, map[string]struct{}{}, availability)
	if len(got) != 1 || got[0].Episode != 3 {
		t.Fatalf("selected %#v, want only not-yet-downloaded episode 3", got)
	}
	if !svc.downloadPathHasCandidate(t.Context(), sub, "间谍过家家 S01E02 1080p", root) {
		t.Fatal("expected existing pending E02 file to be detected")
	}
	if svc.downloadPathHasCandidate(t.Context(), sub, "间谍过家家 S01E03 1080p", root) {
		t.Fatal("did not expect missing E03 to be detected")
	}
}