package internal

import (
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestAuthenticateByNameSuccess(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Fatalf("expected POST, got %s", r.Method)
		}
		if r.URL.Path != "/Users/AuthenticateByName" {
			t.Fatalf("unexpected path %q", r.URL.Path)
		}
		if got := r.Header.Get("Content-Type"); got != "application/json" {
			t.Fatalf("unexpected content type %q", got)
		}
		if got := r.Header.Get("Authorization"); !strings.Contains(got, `MediaBrowser Client="Pegasus"`) {
			t.Fatalf("unexpected auth header %q", got)
		}

		body, err := io.ReadAll(r.Body)
		if err != nil {
			t.Fatalf("read body failed: %v", err)
		}
		var in map[string]string
		if err := json.Unmarshal(body, &in); err != nil {
			t.Fatalf("decode body failed: %v", err)
		}
		if in["Username"] != "brad" || in["Pw"] != "hunter2" {
			t.Fatalf("unexpected auth payload %#v", in)
		}

		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"AccessToken":"abc123","User":{"Id":"u1","Name":"brad"}}`))
	}))
	defer srv.Close()

	j := &Jellyfin{BaseURL: srv.URL, Client: srv.Client()}
	out, err := j.AuthenticateByName("brad", "hunter2")
	if err != nil {
		t.Fatalf("AuthenticateByName failed: %v", err)
	}
	if out.AccessToken != "abc123" || out.User.Name != "brad" || out.User.Id != "u1" {
		t.Fatalf("unexpected auth response %#v", out)
	}
}

func TestAuthenticateByNameLoginFailure(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusUnauthorized)
		_, _ = w.Write([]byte("nope"))
	}))
	defer srv.Close()

	j := &Jellyfin{BaseURL: srv.URL, Client: srv.Client()}
	_, err := j.AuthenticateByName("brad", "bad")
	if err == nil || !strings.Contains(err.Error(), "login failed") {
		t.Fatalf("expected login failed error, got %v", err)
	}
}

func TestAuthenticateByNameBadJSON(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte("{not-json"))
	}))
	defer srv.Close()

	j := &Jellyfin{BaseURL: srv.URL, Client: srv.Client()}
	_, err := j.AuthenticateByName("brad", "pw")
	if err == nil {
		t.Fatalf("expected decode error")
	}
}

func TestAuthenticateByNameRequestError(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
	baseURL := srv.URL
	srv.Close() // force client request error

	j := &Jellyfin{BaseURL: baseURL, Client: &http.Client{}}
	_, err := j.AuthenticateByName("brad", "pw")
	if err == nil {
		t.Fatalf("expected transport error")
	}
}

func TestNewJellyfinReadsEnv(t *testing.T) {
	t.Setenv("JELLYFIN_URL", "http://example.invalid")
	j := NewJellyfin()
	if j.BaseURL != "http://example.invalid" {
		t.Fatalf("unexpected base url %q", j.BaseURL)
	}
	if j.Client == nil {
		t.Fatalf("expected default client")
	}
}