//go:build llm_script

package main

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"llm-intelligence/internal/retry"
)

// Test 1: parseModels 正确解析 name、context_length、capabilities、pricing input/prompt 和 output/completion
func TestParseModels(t *testing.T) {
	// 从样例文件读取，而非内联 JSON
	samplePath := filepath.Join("testdata", "openrouter_models_sample.json")
	raw, err := os.ReadFile(samplePath)
	if err != nil {
		t.Fatalf("读取样例文件失败: %v", err)
	}

	models, err := parseModels(raw)
	if err != nil {
		t.Fatalf("parseModels 失败: %v", err)
	}
	if len(models) != 3 {
		t.Fatalf("期望 3 条，实际 %d", len(models))
	}

	// 第一条：完整字段
	m := models[0]
	if m.ID != "openai/gpt-4o" {
		t.Errorf("ID 错误: %s", m.ID)
	}
	if m.Name != "GPT-4o" {
		t.Errorf("Name 错误: %s", m.Name)
	}
	if m.ContextLength != 128000 {
		t.Errorf("ContextLength 错误: %d", m.ContextLength)
	}
	if len(m.Capabilities) != 3 {
		t.Errorf("Capabilities 长度错误: %d", len(m.Capabilities))
	}
	if m.Pricing.Input != 2.5 {
		t.Errorf("Pricing.Input 错误: %f", m.Pricing.Input)
	}
	if m.Pricing.Output != 10.0 {
		t.Errorf("Pricing.Output 错误: %f", m.Pricing.Output)
	}
	if modality := deriveModality(m); modality != "multimodal" {
		t.Errorf("deriveModality = %q, want %q", modality, "multimodal")

	}

	// 第二条：pricing 用 prompt/completion 别名回退
	m2 := models[1]
	if m2.Pricing.Input != 0.1 {
		t.Errorf("Input 回退 prompt 失败: %f", m2.Pricing.Input)
	}
	if m2.Pricing.Output != 0.3 {
		t.Errorf("Output 回退 completion 失败: %f", m2.Pricing.Output)
	}

	// 第三条：空 pricing
	m3 := models[2]
	if m3.Pricing.Input != 0 || m3.Pricing.Output != 0 {
		t.Errorf("空 pricing 未返回 0: input=%f output=%f", m3.Pricing.Input, m3.Pricing.Output)
	}
}

func TestDeriveModality(t *testing.T) {
	tests := []struct {
		name         string
		capabilities []string
		want         string
	}{
		{name: "vision first", capabilities: []string{"vision", "json_mode"}, want: "multimodal"},
		{name: "audio", capabilities: []string{"audio_generation"}, want: "audio"},
		{name: "code", capabilities: []string{"code_interpreter"}, want: "code"},
		{name: "text fallback", capabilities: []string{"function_calling"}, want: "text"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := deriveModality(ModelInfo{Capabilities: tt.capabilities}); got != tt.want {
				t.Fatalf("deriveModality() = %q, want %q", got, tt.want)
			}
		})
	}
}

func TestDeriveModalityInfersFromModelIdentityWithoutCapabilities(t *testing.T) {
	tests := []struct {
		name  string
		model ModelInfo
		want  string
	}{
		{
			name: "omni id maps to multimodal",
			model: ModelInfo{
				ID:          "nvidia/nemotron-3-nano-omni-30b-a3b-reasoning:free",
				Description: "accepts text, image, video, and audio inputs",
			},
			want: "multimodal",
		},
		{
			name: "audio id maps to audio",
			model: ModelInfo{
				ID:          "openai/gpt-audio",
				Description: "audio model for natural sounding voices",
			},
			want: "audio",
		},
		{
			name: "vl id maps to multimodal",
			model: ModelInfo{
				ID:          "qwen/qwen3-vl-32b-instruct",
				Description: "vision-language model for text, images, and video",
			},
			want: "multimodal",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := deriveModality(tt.model); got != tt.want {
				t.Fatalf("deriveModality(%+v) = %q, want %q", tt.model, got, tt.want)
			}
		})
	}
}

// Test 2: run 无 API Key 时写入临时文件，JSON 含 total 和 models 字段
func TestRunNoAPIKey(t *testing.T) {
	tmpDir := t.TempDir()
	outPath := filepath.Join(tmpDir, "models.json")

	cfg := Config{OutPath: outPath}
	err := run(cfg)
	if err != nil {
		t.Fatalf("run 失败: %v", err)
	}

	data, err := os.ReadFile(outPath)
	if err != nil {
		t.Fatalf("读取输出文件失败: %v", err)
	}

	var result map[string]any
	if err := json.Unmarshal(data, &result); err != nil {
		t.Fatalf("JSON 解析失败: %v", err)
	}

	if _, ok := result["total"]; !ok {
		t.Error("JSON 缺少 total 字段")
	}
	if _, ok := result["models"]; !ok {
		t.Error("JSON 缺少 models 字段")
	}
	models, ok := result["models"].([]any)
	if !ok {
		t.Fatal("models 字段类型错误")
	}
	if len(models) == 0 {
		t.Error("models 为空")
	}
}

func TestFetchModelsFailsInStrictRealModeWithoutAPIKey(t *testing.T) {
	_, err := fetchModels(Config{StrictReal: true})
	if err == nil {
		t.Fatal("strict real mode should fail without API key")
	}
}

func TestFetchModelsDoesNotRetryPermanentHTTPErrors(t *testing.T) {
	attempts := 0
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		attempts++
		http.Error(w, "forbidden", http.StatusForbidden)
	}))
	defer server.Close()

	_, err := fetchModels(Config{
		APIKey:     "test-key",
		APIURL:     server.URL,
		MaxRetries: 3,
		TimeoutSec: 1,
		StrictReal: true,
	})
	if err == nil {
		t.Fatal("expected fetchModels to fail on 403")
	}
	if attempts != 1 {
		t.Fatalf("expected 1 attempt for permanent HTTP error, got %d", attempts)
	}
}

func TestFetchModelsRetriesServerErrors(t *testing.T) {
	attempts := 0
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		attempts++
		if attempts < 3 {
			http.Error(w, "temporary", http.StatusBadGateway)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"data":[{"id":"openai/gpt-4o","name":"GPT-4o","context_length":128000,"pricing":{"input":2.5,"output":10.0}}]}`))
	}))
	defer server.Close()

	models, err := fetchModels(Config{
		APIKey:     "test-key",
		APIURL:     server.URL,
		MaxRetries: 3,
		TimeoutSec: 1,
		StrictReal: true,
	})
	if err != nil {
		t.Fatalf("expected retry success, got %v", err)
	}
	if len(models) != 1 {
		t.Fatalf("expected 1 model, got %d", len(models))
	}
	if attempts != 3 {
		t.Fatalf("expected 3 attempts for temporary server error, got %d", attempts)
	}
}

func TestRunFailsInStrictRealModeWhenDBWriteFails(t *testing.T) {
	tmpDir := t.TempDir()
	outPath := filepath.Join(tmpDir, "models.json")
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"data":[{"id":"openai/gpt-4o","name":"GPT-4o","context_length":128000,"pricing":{"input":2.5,"output":10.0}}]}`))
	}))
	defer server.Close()

	err := run(Config{
		APIKey:     "test-key",
		APIURL:     server.URL,
		OutPath:    outPath,
		DBConn:     "postgres://invalid@127.0.0.1:1/invalid?sslmode=disable",
		BatchSize:  10,
		TimeoutSec: 1,
		StrictReal: true,
	})
	if err == nil {
		t.Fatal("strict real mode should fail when database write fails")
	}
}

func TestRetryHTTPStatusErrorClassification(t *testing.T) {
	if retry.IsRetryable(retry.HTTPStatusError{StatusCode: http.StatusForbidden}) {
		t.Fatal("403 should not be retryable")
	}
	if !retry.IsRetryable(retry.HTTPStatusError{StatusCode: http.StatusBadGateway}) {
		t.Fatal("502 should be retryable")
	}
}