package voice

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

func TestNewServiceDefaultConfig(t *testing.T) {
	svc := New(Config{TTSProviders: []string{"silent"}})

	if svc.sttProvider == nil {
		t.Fatal("expected STT provider")
	}
	if svc.sttProvider.Name() != "silent" {
		t.Errorf("expected silent STT, got %s", svc.sttProvider.Name())
	}
}

func TestNewServiceEmptyConfig(t *testing.T) {
	svc := New(Config{})

	if svc.sttProvider == nil {
		t.Fatal("expected fallback STT provider")
	}
	if len(svc.ttsProviders) == 0 {
		t.Fatal("expected at least one fallback TTS provider")
	}
	if got := svc.TTSProviderNames(); len(got) != 1 || got[0] != "silent" {
		t.Errorf("expected [silent] chain, got %v", got)
	}
}

func TestServiceRecognize(t *testing.T) {
	svc := New(Config{})

	result, err := svc.Recognize(context.Background(), []byte("test audio"))
	if err != nil {
		t.Errorf("Recognize should not error: %v", err)
	}
	if result != "" {
		t.Logf("Recognize result: %s", result)
	}
}

func TestServiceSynthesize(t *testing.T) {
	svc := New(Config{TTSProviders: []string{"silent"}})

	audio, err := svc.Synthesize(context.Background(), "你好世界", "zh-CN-XiaoxiaoNeural")
	if err != nil {
		t.Fatalf("Synthesize should not error: %v", err)
	}
	if audio == nil {
		t.Error("expected non-nil audio")
	}
}

func TestTTSProviderChainSkipsUnavailable(t *testing.T) {
	// edge-tts/espeak binaries are usually absent in CI — they must be
	// skipped, leaving at least the silent provider.
	svc := New(Config{TTSProviders: []string{"edge-tts", "espeak", "silent"}})

	names := svc.TTSProviderNames()
	if names[len(names)-1] != "silent" {
		t.Errorf("chain must end with silent, got %v", names)
	}
	for _, n := range names {
		if n == "edge-tts" && newEdgeTTS().bin == "" {
			t.Error("edge-tts in chain but binary not found")
		}
	}
}

func TestProviderNames(t *testing.T) {
	cases := map[string]TTSProvider{
		"cloud":    &cloudTTS{},
		"local":    &localTTS{},
		"edge-tts": &edgeTTS{},
		"espeak":   &espeakTTS{},
		"silent":   &silentTTS{},
	}
	for want, p := range cases {
		if p.Name() != want {
			t.Errorf("provider name = %s, want %s", p.Name(), want)
		}
	}
	if n := (STTProvider)(&whisperSTT{}).Name(); n != "whisper-api" {
		t.Errorf("stt name = %s", n)
	}
	if n := (&silentSTT{}).Name(); n != "silent" {
		t.Errorf("stt name = %s", n)
	}
}

func TestCloudTTS(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/audio/speech" {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}
		body, _ := io.ReadAll(r.Body)
		if !strings.Contains(string(body), "cosyvoice-v1") || !strings.Contains(string(body), "你好") {
			t.Errorf("unexpected body: %s", body)
		}
		w.Write([]byte("fake-mp3-bytes"))
	}))
	defer srv.Close()

	p := &cloudTTS{baseURL: srv.URL, apiKey: "k", model: "cosyvoice-v1", defaultVoice: "longxiaochun", client: srv.Client()}
	audio, err := p.Synthesize(context.Background(), "你好", "")
	if err != nil {
		t.Fatalf("Synthesize: %v", err)
	}
	if string(audio) != "fake-mp3-bytes" {
		t.Errorf("audio = %q", audio)
	}
}

func TestLocalTTS(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("local-audio"))
	}))
	defer srv.Close()

	p := &localTTS{url: srv.URL, client: srv.Client()}
	audio, err := p.Synthesize(context.Background(), "文本", "")
	if err != nil || string(audio) != "local-audio" {
		t.Errorf("audio=%q err=%v", audio, err)
	}
}

func TestWhisperSTT(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/audio/transcriptions" {
			t.Errorf("unexpected path: %s", r.URL.Path)
		}
		if err := r.ParseMultipartForm(1 << 20); err != nil {
			t.Errorf("parse multipart: %v", err)
		}
		w.Write([]byte(`{"text":"识别结果"}`))
	}))
	defer srv.Close()

	p := &whisperSTT{baseURL: srv.URL, apiKey: "k", model: "whisper-large-v3", client: srv.Client()}
	text, err := p.Recognize(context.Background(), []byte("RIFF....fake-wav"))
	if err != nil || text != "识别结果" {
		t.Errorf("text=%q err=%v", text, err)
	}
}

func TestFallbackChain(t *testing.T) {
	// First provider unreachable, second (silent) succeeds
	svc := &Service{ttsProviders: []TTSProvider{
		&localTTS{url: "http://127.0.0.1:1", client: &http.Client{}},
		&silentTTS{},
	}}
	audio, err := svc.Synthesize(context.Background(), "text", "")
	if err != nil || len(audio) != 0 {
		t.Errorf("expected silent fallback empty audio, got %d bytes, err=%v", len(audio), err)
	}
}