package ai

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os/exec"
	"strings"
	"sync/atomic"
	"testing"
)

func TestCallOpeningUsesApprovedTTSOnce(t *testing.T) {
	if _, err := exec.LookPath("ffmpeg"); err != nil {
		t.Skip("Bailian audio conversion requires ffmpeg")
	}
	task, providers := currentFixture(t, "full_ai")
	text := make(chan string, 1)
	endpoint, calls := mockBailianTTS(t, []byte{1, 0, 2, 0}, func(value string) { text <- value })
	p := providers["tts-example"]
	p.Endpoint = endpoint
	providers[p.ProviderRef] = p
	bound, err := Bind(task, providers)
	if err != nil {
		t.Fatal(err)
	}
	call, err := NewCall(bound, func(context.Context) error { return nil })
	if err != nil {
		t.Fatal(err)
	}
	audio, err := call.Open(context.Background())
	if err != nil || len(audio) != 4 || <-text != bound.Opening {
		t.Fatalf("approved opening was not synthesized once: len=%d err=%v", len(audio), err)
	}
	if _, err := call.Open(context.Background()); err == nil || !strings.Contains(err.Error(), "already") || calls.Load() != 1 {
		t.Fatalf("opening cannot be replayed: requests=%d err=%v", calls.Load(), err)
	}
}

func TestCallOpeningFailureIsVisibleAndNeverRetried(t *testing.T) {
	task, providers := currentFixture(t, "full_ai")
	var calls atomic.Int32
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		calls.Add(1)
		http.Error(w, "mock provider unavailable", http.StatusServiceUnavailable)
	}))
	defer server.Close()
	p := providers["tts-example"]
	p.Endpoint = server.URL + "/api/v1/services/aigc/multimodal-generation/generation"
	providers[p.ProviderRef] = p
	bound, err := Bind(task, providers)
	if err != nil {
		t.Fatal(err)
	}
	call, err := NewCall(bound, func(context.Context) error { return nil })
	if err != nil {
		t.Fatal(err)
	}
	if _, err := call.Open(context.Background()); err == nil {
		t.Fatal("provider failure must be visible")
	}
	if _, err := call.Open(context.Background()); err == nil || calls.Load() != 1 {
		t.Fatalf("uncertain opening must not replay: requests=%d err=%v", calls.Load(), err)
	}
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	if _, err := call.RunTurn(ctx, []byte{1, 0}); err == nil || !strings.Contains(err.Error(), "opening") {
		t.Fatalf("an unsuccessful opening cannot be silently skipped: %v", err)
	}
}

func TestCallASROnlyNeverRequestsOpeningTTS(t *testing.T) {
	task, providers := currentFixture(t, "asr_only")
	bound, err := Bind(task, providers)
	if err != nil {
		t.Fatal(err)
	}
	call, err := NewCall(bound, func(context.Context) error { return nil })
	if err != nil {
		t.Fatal(err)
	}
	if _, err := call.Open(context.Background()); err == nil {
		t.Fatal("ASR-only call cannot synthesize an opening")
	}
}

func TestCallOptionalEmptyOpeningMakesNoTTSRequest(t *testing.T) {
	task, providers := currentFixture(t, "full_ai")
	task = changeCurrentAgent(t, task, func(agent map[string]any) {
		agent["conversation"].(map[string]any)["opening"] = ""
	})
	bound, err := Bind(task, providers)
	if err != nil {
		t.Fatal(err)
	}
	call, err := NewCall(bound, func(context.Context) error { return nil })
	if err != nil {
		t.Fatal(err)
	}
	if audio, err := call.Open(context.Background()); err != nil || len(audio) != 0 {
		t.Fatalf("an approved empty opening must not call TTS: len=%d err=%v", len(audio), err)
	}
	if _, err := call.Open(context.Background()); err == nil {
		t.Fatal("opening stage cannot run twice even if no audio was configured")
	}
}

func TestCallRequiresApprovedOpeningBeforeFullAITurn(t *testing.T) {
	task, providers := currentFixture(t, "full_ai")
	bound, err := Bind(task, providers)
	if err != nil {
		t.Fatal(err)
	}
	call, err := NewCall(bound, func(context.Context) error { return nil })
	if err != nil {
		t.Fatal(err)
	}
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	if _, err := call.RunTurn(ctx, []byte{1, 0}); err == nil || !strings.Contains(err.Error(), "opening") {
		t.Fatalf("a full-AI turn cannot skip its configured opening: %v", err)
	}
}