package anthropic

import (
	"encoding/json"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"nex/backend/internal/protocol/openai"
)

func TestConvertRequest_Basic(t *testing.T) {
	temp := 0.7
	req := &MessagesRequest{
		Model:       "claude-3-opus",
		MaxTokens:   1024,
		Temperature: &temp,
		Messages: []AnthropicMessage{
			{
				Role: "user",
				Content: []ContentBlock{
					{Type: "text", Text: "Hello"},
				},
			},
		},
	}

	result, err := ConvertRequest(req)
	require.NoError(t, err)
	assert.Equal(t, "claude-3-opus", result.Model)
	assert.Equal(t, 1024, *result.MaxTokens)
	assert.Equal(t, &temp, result.Temperature)
	require.Len(t, result.Messages, 1)
	assert.Equal(t, "user", result.Messages[0].Role)
	assert.Equal(t, "Hello", result.Messages[0].Content)
}

func TestConvertRequest_WithSystem(t *testing.T) {
	req := &MessagesRequest{
		Model:     "claude-3-opus",
		MaxTokens: 100,
		System:    "You are a helpful assistant.",
		Messages: []AnthropicMessage{
			{
				Role:    "user",
				Content: []ContentBlock{{Type: "text", Text: "Hi"}},
			},
		},
	}

	result, err := ConvertRequest(req)
	require.NoError(t, err)
	require.Len(t, result.Messages, 2)
	assert.Equal(t, "system", result.Messages[0].Role)
	assert.Equal(t, "You are a helpful assistant.", result.Messages[0].Content)
	assert.Equal(t, "user", result.Messages[1].Role)
}

func TestConvertRequest_DefaultMaxTokens(t *testing.T) {
	req := &MessagesRequest{
		Model:     "claude-3-opus",
		MaxTokens: 0, // 未设置
		Messages: []AnthropicMessage{
			{Role: "user", Content: []ContentBlock{{Type: "text", Text: "Hi"}}},
		},
	}

	result, err := ConvertRequest(req)
	require.NoError(t, err)
	assert.Equal(t, 4096, *result.MaxTokens)
}

func TestConvertRequest_WithTools(t *testing.T) {
	req := &MessagesRequest{
		Model:     "claude-3-opus",
		MaxTokens: 100,
		Messages: []AnthropicMessage{
			{Role: "user", Content: []ContentBlock{{Type: "text", Text: "Hi"}}},
		},
		Tools: []AnthropicTool{
			{
				Name:        "get_weather",
				Description: "Get weather info",
				InputSchema: map[string]interface{}{"type": "object"},
			},
		},
	}

	result, err := ConvertRequest(req)
	require.NoError(t, err)
	require.Len(t, result.Tools, 1)
	assert.Equal(t, "function", result.Tools[0].Type)
	assert.Equal(t, "get_weather", result.Tools[0].Function.Name)
}

func TestConvertRequest_WithStopSequences(t *testing.T) {
	req := &MessagesRequest{
		Model:         "claude-3-opus",
		MaxTokens:     100,
		StopSequences: []string{"STOP", "END"},
		Messages: []AnthropicMessage{
			{Role: "user", Content: []ContentBlock{{Type: "text", Text: "Hi"}}},
		},
	}

	result, err := ConvertRequest(req)
	require.NoError(t, err)
	assert.Equal(t, []string{"STOP", "END"}, result.Stop)
}

func TestConvertRequest_ToolResult(t *testing.T) {
	req := &MessagesRequest{
		Model:     "claude-3-opus",
		MaxTokens: 100,
		Messages: []AnthropicMessage{
			{
				Role: "user",
				Content: []ContentBlock{
					{
						Type:      "tool_result",
						ToolUseID: "tool_123",
						Content:   "result data",
					},
				},
			},
		},
	}

	result, err := ConvertRequest(req)
	require.NoError(t, err)
	require.Len(t, result.Messages, 1)
	assert.Equal(t, "tool", result.Messages[0].Role)
	assert.Equal(t, "tool_123", result.Messages[0].ToolCallID)
	assert.Equal(t, "result data", result.Messages[0].Content)
}

func TestConvertResponse(t *testing.T) {
	resp := &openai.ChatCompletionResponse{
		ID:      "chatcmpl-123",
		Model:   "gpt-4",
		Choices: []openai.Choice{
			{
				Index:        0,
				Message:      &openai.Message{Role: "assistant", Content: "Hello!"},
				FinishReason: "stop",
			},
		},
		Usage: openai.Usage{PromptTokens: 10, CompletionTokens: 5},
	}

	result, err := ConvertResponse(resp)
	require.NoError(t, err)
	assert.Equal(t, "chatcmpl-123", result.ID)
	assert.Equal(t, "message", result.Type)
	assert.Equal(t, "assistant", result.Role)
	assert.Equal(t, "end_turn", result.StopReason)
	require.Len(t, result.Content, 1)
	assert.Equal(t, "text", result.Content[0].Type)
	assert.Equal(t, "Hello!", result.Content[0].Text)
	assert.Equal(t, 10, result.Usage.InputTokens)
	assert.Equal(t, 5, result.Usage.OutputTokens)
}

func TestConvertResponse_ToolCalls(t *testing.T) {
	args, _ := json.Marshal(map[string]interface{}{"city": "Beijing"})
	resp := &openai.ChatCompletionResponse{
		ID:    "chatcmpl-456",
		Model: "gpt-4",
		Choices: []openai.Choice{
			{
				Index: 0,
				Message: &openai.Message{
					Role: "assistant",
					ToolCalls: []openai.ToolCall{
						{
							ID:   "call_123",
							Type: "function",
							Function: openai.FunctionCall{
								Name:      "get_weather",
								Arguments: string(args),
							},
						},
					},
				},
				FinishReason: "tool_calls",
			},
		},
		Usage: openai.Usage{},
	}

	result, err := ConvertResponse(resp)
	require.NoError(t, err)
	assert.Equal(t, "tool_use", result.StopReason)
	require.Len(t, result.Content, 1)
	assert.Equal(t, "tool_use", result.Content[0].Type)
	assert.Equal(t, "call_123", result.Content[0].ID)
	assert.Equal(t, "get_weather", result.Content[0].Name)
}

func TestConvertToolChoice_String(t *testing.T) {
	tests := []struct {
		name    string
		input   interface{}
		wantErr bool
		check   func(interface{})
	}{
		{"auto字符串", "auto", false, func(r interface{}) { assert.Equal(t, "auto", r) }},
		{"any字符串", "any", false, func(r interface{}) { assert.Equal(t, "auto", r) }},
		{"无效字符串", "invalid", true, nil},
		{"tool对象", map[string]interface{}{"type": "tool", "name": "my_func"}, false,
			func(r interface{}) {
				m := r.(map[string]interface{})
				assert.Equal(t, "function", m["type"])
			}},
		{"缺少name的tool对象", map[string]interface{}{"type": "tool"}, true, nil},
		{"缺少type的对象", map[string]interface{}{"name": "func"}, true, nil},
		{"无效类型", 42, true, nil},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result, err := convertToolChoice(tt.input)
			if tt.wantErr {
				assert.Error(t, err)
			} else {
				require.NoError(t, err)
				tt.check(result)
			}
		})
	}
}

func TestValidateRequest(t *testing.T) {
	t.Run("有效请求", func(t *testing.T) {
		req := &MessagesRequest{
			Model:     "claude-3-opus",
			MaxTokens: 100,
			Messages: []AnthropicMessage{
				{Role: "user", Content: []ContentBlock{{Type: "text", Text: "Hi"}}},
			},
		}
		errs := ValidateRequest(req)
		assert.Nil(t, errs)
	})

	t.Run("缺少模型", func(t *testing.T) {
		req := &MessagesRequest{
			MaxTokens: 100,
			Messages: []AnthropicMessage{
				{Role: "user", Content: []ContentBlock{{Type: "text", Text: "Hi"}}},
			},
		}
		errs := ValidateRequest(req)
		assert.NotNil(t, errs)
		assert.Contains(t, errs["model"], "不能为空")
	})

	t.Run("MaxTokens为0", func(t *testing.T) {
		req := &MessagesRequest{
			Model:     "claude-3-opus",
			MaxTokens: 0,
			Messages: []AnthropicMessage{
				{Role: "user", Content: []ContentBlock{{Type: "text", Text: "Hi"}}},
			},
		}
		errs := ValidateRequest(req)
		assert.NotNil(t, errs)
	})
}