package service

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

func TestAIClientDetectParsesResult(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodPost {
			t.Errorf("method = %s, want POST", r.Method)
		}
		if r.URL.Path != "/detect" {
			t.Errorf("path = %s, want /detect", r.URL.Path)
		}
		if err := r.ParseMultipartForm(10 << 20); err != nil {
			t.Errorf("multipart 解析失败: %v", err)
		}
		if _, _, err := r.FormFile("file"); err != nil {
			t.Errorf("缺少 file 字段: %v", err)
		}
		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(map[string]any{
			"model": "mock",
			"detections": []map[string]any{
				{"bbox": map[string]float64{"x": 1, "y": 2, "w": 3, "h": 4}, "class": "sick", "confidence": 0.93},
			},
		})
	}))
	defer srv.Close()

	client := NewAIClient(srv.URL)
	res, err := client.Detect(context.Background(), []byte("image-bytes"), "a.png")
	if err != nil {
		t.Fatalf("Detect 返回错误: %v", err)
	}
	if res.Model != "mock" {
		t.Errorf("model = %s, want mock", res.Model)
	}
	if len(res.Detections) != 1 {
		t.Fatalf("detections 数量 = %d, want 1", len(res.Detections))
	}
	d := res.Detections[0]
	if d.ClassName != "sick" || d.Confidence != 0.93 || d.BBox.W != 3 {
		t.Errorf("解析结果不正确: %+v", d)
	}
}

func TestAIClientDetectServerError(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Error(w, "boom", http.StatusInternalServerError)
	}))
	defer srv.Close()

	_, err := NewAIClient(srv.URL).Detect(context.Background(), []byte("x"), "a.png")
	if err == nil {
		t.Error("服务端 500 应返回错误")
	}
}

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

	_, err := NewAIClient(srv.URL).Detect(context.Background(), []byte("x"), "a.png")
	if err == nil {
		t.Error("非法 JSON 应返回错误")
	}
}