package creator

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

func TestBailianClientGeneratesAndParsesDecisions(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost || r.URL.Path != "/v1/chat/completions" {
			t.Fatalf("unexpected request: %s %s", r.Method, r.URL.Path)
		}
		if r.Header.Get("Authorization") != "Bearer test-key" {
			t.Fatal("missing authorization")
		}
		var request bailianChatRequest
		if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
			t.Fatal(err)
		}
		if request.Model != "qwen-test" || len(request.Messages) != 2 {
			t.Fatalf("unexpected request body: %#v", request)
		}
		_ = json.NewEncoder(w).Encode(map[string]any{"choices": []any{map[string]any{
			"message": map[string]string{"role": "assistant", "content": `{"match":true,"reason":"相关"}`},
		}}})
	}))
	defer server.Close()

	client, err := NewBailianClient(server.URL+"/v1", "test-key", "qwen-test", server.Client())
	if err != nil {
		t.Fatal(err)
	}
	text, err := client.Generate(context.Background(), "要求", "输入")
	if err != nil || text == "" {
		t.Fatalf("Generate() = %q, %v", text, err)
	}
	match, reason, err := client.MatchLead(context.Background(), "作品", "评论", "要求")
	if err != nil || !match || reason != "相关" {
		t.Fatalf("MatchLead() = %v, %q, %v", match, reason, err)
	}
	match, reason, err = client.MatchTheme(context.Background(), "标题", "正文", "主题")
	if err != nil || !match || reason != "相关" {
		t.Fatalf("MatchTheme() = %v, %q, %v", match, reason, err)
	}
}

func TestBailianClientRejectsHTTPAndMalformedResponses(t *testing.T) {
	responses := []string{"not-json", `{"choices":[]}`}
	for _, body := range responses {
		server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
			w.WriteHeader(http.StatusBadGateway)
			_, _ = w.Write([]byte(body))
		}))
		client, err := NewBailianClient(server.URL, "key", "model", server.Client())
		if err != nil {
			server.Close()
			t.Fatal(err)
		}
		if _, err := client.Generate(context.Background(), "instruction", "input"); err == nil {
			server.Close()
			t.Fatal("expected HTTP failure")
		}
		server.Close()
	}
	var nilClient *BailianClient
	if _, err := nilClient.Generate(context.Background(), "instruction", "input"); err == nil {
		t.Fatal("nil client must fail closed")
	}
}

func TestBailianClientRejectsIncompleteConfiguration(t *testing.T) {
	if _, err := NewBailianClient("", "", "qwen-test", nil); err == nil {
		t.Fatal("expected missing key to fail")
	}
	if _, err := NewBailianClient("", "test-key", "", nil); err == nil {
		t.Fatal("expected missing model to fail")
	}
}

func TestBailianClientRejectsMissingDecisionField(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		_, _ = w.Write([]byte(`{"choices":[{"message":{"content":"{}"}}]}`))
	}))
	defer server.Close()
	client, err := NewBailianClient(server.URL, "test-key", "qwen-test", server.Client())
	if err != nil {
		t.Fatal(err)
	}
	if _, _, err := client.MatchLead(context.Background(), "work", "comment", "requirement"); err == nil {
		t.Fatal("expected missing match decision to fail closed")
	}
}