package qbt

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

// fakeQBittorrent — минимальный стенд WebUI API: требует cookie SID, выдаёт
// его на /auth/login. Так проверяется и ленивый логин по 403.
func fakeQBittorrent(t *testing.T, info string) *httptest.Server {
	t.Helper()
	mux := http.NewServeMux()

	mux.HandleFunc("/api/v2/auth/login", func(w http.ResponseWriter, r *http.Request) {
		_ = r.ParseForm()
		if r.PostForm.Get("username") != "admin" || r.PostForm.Get("password") != "secret" {
			w.WriteHeader(http.StatusForbidden)
			return
		}
		http.SetCookie(w, &http.Cookie{Name: "SID", Value: "token", Path: "/"})
		_, _ = w.Write([]byte("Ok."))
	})

	authed := func(next http.HandlerFunc) http.HandlerFunc {
		return func(w http.ResponseWriter, r *http.Request) {
			if c, err := r.Cookie("SID"); err != nil || c.Value != "token" {
				w.WriteHeader(http.StatusForbidden)
				return
			}
			next(w, r)
		}
	}

	mux.HandleFunc("/api/v2/torrents/add", authed(func(w http.ResponseWriter, r *http.Request) {
		if err := r.ParseMultipartForm(1 << 20); err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		if r.FormValue("category") != "jellybit" || !strings.Contains(r.FormValue("urls"), "magnet:") {
			w.WriteHeader(http.StatusBadRequest)
			return
		}
		_, _ = w.Write([]byte("Ok."))
	}))

	mux.HandleFunc("/api/v2/torrents/info", authed(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Query().Get("category") != "jellybit" {
			w.WriteHeader(http.StatusBadRequest)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(info))
	}))

	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)
	return srv
}

func newClient(t *testing.T, url string) *Client {
	t.Helper()
	c, err := New(Config{URL: url, Username: "admin", Password: "secret"}, nil)
	if err != nil {
		t.Fatalf("New: %v", err)
	}
	return c
}

func TestAddSendsRename(t *testing.T) {
	tests := []struct {
		name       string
		rename     string
		wantField  string
		wantHasKey bool
	}{
		{name: "with rename", rename: "Дюна: Часть вторая (2024)", wantField: "Дюна: Часть вторая (2024)", wantHasKey: true},
		{name: "empty rename omits field", rename: "", wantHasKey: false},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			var gotField string
			var hasKey bool
			mux := http.NewServeMux()
			mux.HandleFunc("/api/v2/torrents/add", func(w http.ResponseWriter, r *http.Request) {
				if err := r.ParseMultipartForm(1 << 20); err != nil {
					http.Error(w, err.Error(), http.StatusBadRequest)
					return
				}
				_, hasKey = r.MultipartForm.Value["rename"]
				gotField = r.FormValue("rename")
				_, _ = w.Write([]byte("Ok."))
			})
			srv := httptest.NewServer(mux)
			t.Cleanup(srv.Close)

			c := newClient(t, srv.URL)
			err := c.Add(context.Background(), AddRequest{
				URLs:   []string{"magnet:?xt=urn:btih:541adcff3b6dd5dba7088ea83317d9d6fac331d6"},
				Rename: tc.rename,
			})
			if err != nil {
				t.Fatalf("Add: %v", err)
			}
			if hasKey != tc.wantHasKey {
				t.Errorf("наличие поля rename = %v, want %v", hasKey, tc.wantHasKey)
			}
			if gotField != tc.wantField {
				t.Errorf("rename = %q, want %q", gotField, tc.wantField)
			}
		})
	}
}

func TestDeleteSendsHashesAndDeleteFiles(t *testing.T) {
	var gotHashes, gotDeleteFiles string
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v2/torrents/delete", func(w http.ResponseWriter, r *http.Request) {
		_ = r.ParseForm()
		gotHashes = r.PostForm.Get("hashes")
		gotDeleteFiles = r.PostForm.Get("deleteFiles")
		_, _ = w.Write([]byte("Ok."))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	c := newClient(t, srv.URL)
	err := c.Delete(context.Background(), []string{"aaa", "", "bbb"}, true)
	if err != nil {
		t.Fatalf("Delete: %v", err)
	}
	if gotHashes != "aaa|bbb" { // пустые хеши отфильтрованы, склейка через |
		t.Errorf("hashes = %q, want %q", gotHashes, "aaa|bbb")
	}
	if gotDeleteFiles != "true" {
		t.Errorf("deleteFiles = %q, want true", gotDeleteFiles)
	}
}

func TestDeleteNoHashesIsError(t *testing.T) {
	c := newClient(t, "http://unused")
	if err := c.Delete(context.Background(), []string{"", "  "}, true); err == nil {
		t.Fatal("Delete with no hashes must error before any request")
	}
}

func TestAddPerformsLazyLogin(t *testing.T) {
	srv := fakeQBittorrent(t, "[]")
	c := newClient(t, srv.URL)

	// Первый вызов без cookie → сервер вернёт 403 → клиент логинится и повторяет.
	err := c.Add(context.Background(), AddRequest{
		URLs:     []string{"magnet:?xt=urn:btih:541adcff3b6dd5dba7088ea83317d9d6fac331d6"},
		Category: "jellybit",
		SavePath: "/srv/media/downloads",
	})
	if err != nil {
		t.Fatalf("Add: %v", err)
	}
}

func TestTorrents(t *testing.T) {
	const body = `[{"hash":"541adcff3b6dd5dba7088ea83317d9d6fac331d6","name":"Dune","state":"uploading","save_path":"/srv/media/downloads","content_path":"/srv/media/downloads/Dune","progress":1.0,"amount_left":0}]`
	srv := fakeQBittorrent(t, body)
	c := newClient(t, srv.URL)

	ts, err := c.Torrents(context.Background(), "jellybit")
	if err != nil {
		t.Fatalf("Torrents: %v", err)
	}
	if len(ts) != 1 {
		t.Fatalf("torrents = %d, want 1", len(ts))
	}
	got := ts[0]
	if got.Hash != "541adcff3b6dd5dba7088ea83317d9d6fac331d6" || got.State != "uploading" {
		t.Errorf("torrent = %+v", got)
	}
	if got.ContentPath != "/srv/media/downloads/Dune" {
		t.Errorf("content_path = %q", got.ContentPath)
	}
}

func TestLoginFailure(t *testing.T) {
	srv := fakeQBittorrent(t, "[]")
	c, err := New(Config{URL: srv.URL, Username: "admin", Password: "wrong"}, nil)
	if err != nil {
		t.Fatal(err)
	}
	// 403 → попытка логина с неверным паролем → снова 403 → ошибка.
	if _, err := c.Torrents(context.Background(), "jellybit"); err == nil {
		t.Error("ожидалась ошибка логина")
	}
}