package httpapi_test

import (
	"context"
	"encoding/json"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"git.vakhrushev.me/av/jellybit/internal/httpapi"
	"git.vakhrushev.me/av/jellybit/internal/ingest"
	"git.vakhrushev.me/av/jellybit/internal/layout"
	"git.vakhrushev.me/av/jellybit/internal/recognize"
	"git.vakhrushev.me/av/jellybit/internal/store"
	"git.vakhrushev.me/av/jellybit/internal/worker"
)

type fakeIngestor struct {
	res     ingest.Result
	err     error
	lastReq ingest.Request
}

func (f *fakeIngestor) Ingest(_ context.Context, req ingest.Request) (ingest.Result, error) {
	f.lastReq = req
	return f.res, f.err
}

type fakeCommander struct {
	cancelled []int64
	retried   []int64
	err       error
}

func (f *fakeCommander) Cancel(_ context.Context, id int64) error {
	if f.err != nil {
		return f.err
	}
	f.cancelled = append(f.cancelled, id)
	return nil
}

func (f *fakeCommander) Retry(_ context.Context, id int64) error {
	if f.err != nil {
		return f.err
	}
	f.retried = append(f.retried, id)
	return nil
}

type fakeReader struct {
	list []store.Download
	get  *store.Download
}

func (f *fakeReader) ListDownloads(_ context.Context) ([]store.Download, error) { return f.list, nil }

func (f *fakeReader) GetDownload(_ context.Context, id int64) (*store.Download, error) {
	if f.get != nil {
		return f.get, nil
	}
	return &store.Download{ID: id, State: store.StateCancelled}, nil
}

func newServer(t *testing.T, d httpapi.Deps) *httptest.Server {
	t.Helper()
	if d.Logger == nil {
		d.Logger = slog.New(slog.NewTextHandler(io.Discard, nil))
	}
	h, err := httpapi.NewRouter(d)
	if err != nil {
		t.Fatalf("NewRouter: %v", err)
	}
	srv := httptest.NewServer(h)
	t.Cleanup(srv.Close)
	return srv
}

func TestAPIAdd(t *testing.T) {
	ing := &fakeIngestor{res: ingest.Result{DownloadID: 1, Infohash: "abc", State: store.StateDownloading}}
	srv := newServer(t, httpapi.Deps{Ingestor: ing, Commander: &fakeCommander{}, Reader: &fakeReader{}})

	resp, err := http.Post(srv.URL+"/api/downloads", "application/json",
		strings.NewReader(`{"source":"magnet:?xt=urn:btih:abc","context":"Дюна"}`))
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusCreated {
		t.Fatalf("status = %d, want 201", resp.StatusCode)
	}
	var got map[string]any
	_ = json.NewDecoder(resp.Body).Decode(&got)
	if got["id"].(float64) != 1 || got["state"] != "downloading" {
		t.Errorf("body = %v", got)
	}
	if ing.lastReq.Context != "Дюна" {
		t.Errorf("контекст не проброшен: %q", ing.lastReq.Context)
	}
}

func TestAPIAddBadInput(t *testing.T) {
	ing := &fakeIngestor{err: ingestErr("bad magnet")}
	srv := newServer(t, httpapi.Deps{Ingestor: ing, Commander: &fakeCommander{}, Reader: &fakeReader{}})

	resp, err := http.Post(srv.URL+"/api/downloads", "application/json", strings.NewReader(`{"source":"x"}`))
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusBadRequest {
		t.Fatalf("status = %d, want 400", resp.StatusCode)
	}
}

func TestAPIList(t *testing.T) {
	reader := &fakeReader{list: []store.Download{
		{ID: 2, SourceType: store.SourceMagnet, State: store.StateCompleted, Infohash: store.NullString("abc")},
		{ID: 1, SourceType: store.SourceMagnet, State: store.StateDownloading},
	}}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: &fakeCommander{}, Reader: reader})

	resp, err := http.Get(srv.URL + "/api/downloads")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	var got []map[string]any
	_ = json.NewDecoder(resp.Body).Decode(&got)
	if len(got) != 2 {
		t.Fatalf("len = %d, want 2", len(got))
	}
	if got[0]["state"] != "completed" || got[0]["infohash"] != "abc" {
		t.Errorf("first = %v", got[0])
	}
}

func TestAPICancel(t *testing.T) {
	cmd := &fakeCommander{}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: cmd, Reader: &fakeReader{}})

	resp, err := http.Post(srv.URL+"/api/downloads/5/cancel", "", nil)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, want 200", resp.StatusCode)
	}
	if len(cmd.cancelled) != 1 || cmd.cancelled[0] != 5 {
		t.Errorf("cancel вызван неверно: %v", cmd.cancelled)
	}
}

func TestIndexRenders(t *testing.T) {
	reader := &fakeReader{list: []store.Download{
		{ID: 1, SourceType: store.SourceMagnet, SourceRef: "magnet:?xt=urn:btih:abc", State: store.StateDownloading},
	}}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: &fakeCommander{}, Reader: reader})

	resp, err := http.Get(srv.URL + "/")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d", resp.StatusCode)
	}
	if !strings.Contains(string(body), "jellybit") || !strings.Contains(string(body), "downloading") {
		t.Error("страница не содержит ожидаемого контента")
	}
}

type ingestErr string

func (e ingestErr) Error() string { return string(e) }

// --- Ревью ---

type fakeReviewer struct {
	data     *worker.ReviewData
	applyErr error
	refined  map[int64]string
	typed    map[int64]string
	ignored  map[int64]string
	applied  []int64
	deferred []int64
	undone   []int64
}

func (f *fakeReviewer) ReviewData(_ context.Context, _ int64) (*worker.ReviewData, error) {
	return f.data, nil
}
func (f *fakeReviewer) Apply(_ context.Context, id int64) error {
	if f.applyErr != nil {
		return f.applyErr
	}
	f.applied = append(f.applied, id)
	return nil
}
func (f *fakeReviewer) Refine(_ context.Context, id int64, hint string) error {
	if f.refined == nil {
		f.refined = map[int64]string{}
	}
	f.refined[id] = hint
	return nil
}
func (f *fakeReviewer) SetType(_ context.Context, id int64, t string) error {
	if f.typed == nil {
		f.typed = map[int64]string{}
	}
	f.typed[id] = t
	return nil
}
func (f *fakeReviewer) IgnoreFile(_ context.Context, id int64, src string) error {
	if f.ignored == nil {
		f.ignored = map[int64]string{}
	}
	f.ignored[id] = src
	return nil
}
func (f *fakeReviewer) Defer(_ context.Context, id int64) error {
	f.deferred = append(f.deferred, id)
	return nil
}
func (f *fakeReviewer) Undo(_ context.Context, id int64) error {
	f.undone = append(f.undone, id)
	return nil
}

func seriesReviewData() *worker.ReviewData {
	s, e := 2, 1
	return &worker.ReviewData{
		Download: store.Download{ID: 1, State: store.StateReview, SourceRef: "magnet:?xt=urn:btih:abc"},
		Recognition: &store.Recognition{
			ID: 1, DownloadID: 1, IsCurrent: true, Reasons: `["нет матча в базе"]`,
		},
		Plan: recognize.Plan{
			Type: recognize.MediaSeries, Title: "Фарго", Year: 2015,
			Files: []recognize.PlanFile{
				{Src: "Fargo/e1.mkv", Role: recognize.RoleEpisode, Season: &s, Episode: &e},
			},
		},
		Preview: []layout.Link{
			{Src: "Fargo/e1.mkv", Dst: "/srv/media/series/Фарго (2015)/Season 02/Фарго (2015) S02E01.mkv"},
		},
		Hints: []string{"второй сезон"},
	}
}

// noRedirectClient — не следует за 3xx, чтобы проверять Location.
func noRedirectClient() *http.Client {
	return &http.Client{CheckRedirect: func(*http.Request, []*http.Request) error {
		return http.ErrUseLastResponse
	}}
}

func TestReviewRenders(t *testing.T) {
	rv := &fakeReviewer{data: seriesReviewData()}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: &fakeCommander{},
		Reader: &fakeReader{}, Reviewer: rv})

	resp, err := http.Get(srv.URL + "/review/1")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d", resp.StatusCode)
	}
	for _, want := range []string{"Фарго", "нет матча в базе", "Fargo/e1.mkv",
		"Season 02", "Применить", "Уточнить"} {
		if !strings.Contains(string(body), want) {
			t.Errorf("страница ревью не содержит %q", want)
		}
	}
}

func TestApplyRedirectsToIndex(t *testing.T) {
	rv := &fakeReviewer{data: seriesReviewData()}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: &fakeCommander{},
		Reader: &fakeReader{}, Reviewer: rv})

	resp, err := noRedirectClient().Post(srv.URL+"/ui/downloads/1/apply", "", nil)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusSeeOther {
		t.Fatalf("status = %d, want 303", resp.StatusCode)
	}
	if loc := resp.Header.Get("Location"); loc != "/" {
		t.Errorf("Location = %q, want /", loc)
	}
	if len(rv.applied) != 1 {
		t.Errorf("Apply не вызван: %v", rv.applied)
	}
}

func TestApplyCollisionRedirectsToReview(t *testing.T) {
	rv := &fakeReviewer{data: seriesReviewData(), applyErr: ingestErr("collision")}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: &fakeCommander{},
		Reader: &fakeReader{}, Reviewer: rv})

	resp, err := noRedirectClient().Post(srv.URL+"/ui/downloads/1/apply", "", nil)
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if loc := resp.Header.Get("Location"); !strings.HasPrefix(loc, "/review/1") {
		t.Errorf("Location = %q, want /review/1?err=...", loc)
	}
}

func TestRefinePostsHint(t *testing.T) {
	rv := &fakeReviewer{data: seriesReviewData()}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: &fakeCommander{},
		Reader: &fakeReader{}, Reviewer: rv})

	resp, err := noRedirectClient().PostForm(srv.URL+"/ui/downloads/1/refine",
		map[string][]string{"hint": {"это второй сезон"}})
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	if rv.refined[1] != "это второй сезон" {
		t.Errorf("Refine получил %q", rv.refined[1])
	}
	if loc := resp.Header.Get("Location"); !strings.HasPrefix(loc, "/review/1") {
		t.Errorf("Location = %q", loc)
	}
}

func TestIgnoreAndType(t *testing.T) {
	rv := &fakeReviewer{data: seriesReviewData()}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: &fakeCommander{},
		Reader: &fakeReader{}, Reviewer: rv})
	cl := noRedirectClient()

	if _, err := cl.PostForm(srv.URL+"/ui/downloads/1/ignore",
		map[string][]string{"src": {"Fargo/sample.mkv"}}); err != nil {
		t.Fatal(err)
	}
	if rv.ignored[1] != "Fargo/sample.mkv" {
		t.Errorf("IgnoreFile получил %q", rv.ignored[1])
	}

	if _, err := cl.PostForm(srv.URL+"/ui/downloads/1/type",
		map[string][]string{"type": {"movie"}}); err != nil {
		t.Fatal(err)
	}
	if rv.typed[1] != "movie" {
		t.Errorf("SetType получил %q", rv.typed[1])
	}
}

func TestUndoAndDefer(t *testing.T) {
	rv := &fakeReviewer{data: seriesReviewData()}
	srv := newServer(t, httpapi.Deps{Ingestor: &fakeIngestor{}, Commander: &fakeCommander{},
		Reader: &fakeReader{}, Reviewer: rv})
	cl := noRedirectClient()

	if _, err := cl.Post(srv.URL+"/ui/downloads/1/undo", "", nil); err != nil {
		t.Fatal(err)
	}
	if _, err := cl.Post(srv.URL+"/ui/downloads/1/defer", "", nil); err != nil {
		t.Fatal(err)
	}
	if len(rv.undone) != 1 || len(rv.deferred) != 1 {
		t.Errorf("undo=%v defer=%v", rv.undone, rv.deferred)
	}
}