package ai

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

func TestLLMPassesExplicitZeroAndDoesNotRetry(t *testing.T) {
	task, providers := currentFixture(t, "full_ai")
	calls := 0
	var captured map[string]any
	var authorization string
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		calls++
		authorization = r.Header.Get("Authorization")
		if r.Method != http.MethodPost || !strings.HasSuffix(r.URL.Path, "/chat/completions") {
			http.Error(w, "unexpected LLM request", http.StatusBadRequest)
			return
		}
		if err := json.NewDecoder(r.Body).Decode(&captured); err != nil {
			http.Error(w, "invalid LLM request", http.StatusBadRequest)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = fmt.Fprintln(w, `{"id":"mock","object":"chat.completion","created":0,"model":"example-chat","choices":[{"index":0,"message":{"role":"assistant","content":"收到"},"finish_reason":"stop"}]}`)
	}))
	defer server.Close()
	p := providers["openai_compatible"]
	p.Endpoint = server.URL + "/v1"
	providers[p.Code] = p
	bound, err := Bind(task, providers)
	if err != nil {
		t.Fatal(err)
	}
	reply, err := bound.Complete(context.Background(), "用户说话")
	if err != nil || reply != "收到" || calls != 1 || authorization != "Bearer "+p.Credential {
		t.Fatalf("LLM SDK result=%q requests=%d err=%v", reply, calls, err)
	}
	if captured["model"] != "example-chat" || captured["temperature"] != float64(0) || captured["max_tokens"] != float64(256) {
		t.Fatalf("LLM business values were not transmitted: %v", captured)
	}
	messages := captured["messages"].([]any)
	if len(messages) != 2 || messages[0].(map[string]any)["content"] != "Example only" || messages[1].(map[string]any)["content"] != "用户说话" {
		t.Fatal("immutable prompt and final user text must reach LLM")
	}
}

func TestLLMFailureAndEmptyChoicesAreNotRetried(t *testing.T) {
	for _, tc := range []struct {
		name string
		code int
		body string
	}{
		{name: "provider failure", code: http.StatusInternalServerError, body: `{"error":{"message":"injected failure","type":"server_error"}}`},
		{name: "empty choices", code: http.StatusOK, body: `{"id":"mock","object":"chat.completion","created":0,"model":"example-chat","choices":[]}`},
	} {
		t.Run(tc.name, func(t *testing.T) {
			task, providers := currentFixture(t, "full_ai")
			calls := 0
			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
				calls++
				w.Header().Set("Content-Type", "application/json")
				w.WriteHeader(tc.code)
				_, _ = fmt.Fprintln(w, tc.body)
			}))
			defer server.Close()
			provider := providers["openai_compatible"]
			provider.Endpoint = server.URL + "/v1"
			providers[provider.Code] = provider
			bound, err := Bind(task, providers)
			if err != nil {
				t.Fatal(err)
			}
			if reply, err := bound.Complete(context.Background(), "用户说话"); err == nil || calls != 1 || reply != "" {
				t.Fatalf("LLM failure must be visible without retry: reply=%q calls=%d err=%v", reply, calls, err)
			}
		})
	}
}

func TestKeywordHangupUsesFinalUserTextOnly(t *testing.T) {
	task, providers := currentFixture(t, "full_ai")
	bound, err := Bind(task, providers)
	if err != nil {
		t.Fatal(err)
	}
	calls := 0
	call, err := NewCall(bound, func(context.Context) error { calls++; return nil })
	if err != nil {
		t.Fatal(err)
	}
	for _, segment := range []ASRSegment{
		{Source: "user", Text: "不用了", Final: false},
		{Source: "assistant", Text: "不用了", Final: true},
		{Source: "user", Text: "继续说", Final: true},
	} {
		stop, err := call.HandleFinalASR(context.Background(), segment)
		if err != nil || stop.EndedByKeyword || calls != 0 {
			t.Fatalf("interim/assistant/unmatched text cannot hang up: stopped=%t err=%v calls=%d", stop.EndedByKeyword, err, calls)
		}
	}
	// A missing TTS is an explicit closing failure, not permission to call LLM
	// or silently drop the keyword fact. No provider request is made here.
	call.bound.TTS = nil
	stop, err := call.HandleFinalASR(context.Background(), ASRSegment{Source: "user", Text: "我不用了", Final: true})
	if err == nil || !stop.EndedByKeyword || stop.Transcript != "我不用了" || stop.Reply != "好的，祝您生活愉快。" || calls != 0 {
		t.Fatalf("closing failure lost keyword fact or hung up before playback: turn=%+v calls=%d err=%v", stop, calls, err)
	}
	if err := call.FinishKeyword(context.Background()); err != nil || calls != 1 {
		t.Fatalf("closing failure cleanup: calls=%d err=%v", calls, err)
	}
	if _, err := call.HandleFinalASR(context.Background(), ASRSegment{Source: "user", Text: "我不用了", Final: true}); err == nil {
		t.Fatal("closing failure was replayed")
	}
	if _, err := call.RunTurn(context.Background(), nil); err == nil {
		t.Fatal("new ASR turn started after keyword closing")
	}
}

func TestASRRequiresFinalResult(t *testing.T) {
	var text finalASRAccumulator
	text.Add("不用了", false)
	if _, err := text.Result(); err == nil {
		t.Fatal("interim-only transcript must never trigger keyword hangup or LLM")
	}
	text.Add("继续", true)
	text.Add("不用了", false)
	result, err := text.Result()
	if err != nil || result != "继续" {
		t.Fatalf("only the first final user result may be used: %q %v", result, err)
	}
}