package openai

import (
	"encoding/json"
	"testing"

	"nex/backend/internal/conversion"
	"nex/backend/internal/conversion/canonical"

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

func TestEncodeRequest_Basic(t *testing.T) {
	req := &canonical.CanonicalRequest{
		Model:    "gpt-4",
		Messages: []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
		Stream:   true,
	}
	provider := conversion.NewTargetProvider("", "key", "my-model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	assert.Equal(t, "my-model", result["model"])
	assert.Equal(t, true, result["stream"])

	msgs, ok := result["messages"].([]any)
	require.True(t, ok)
	assert.Len(t, msgs, 1)
}

func TestEncodeRequest_SystemInjection(t *testing.T) {
	req := &canonical.CanonicalRequest{
		Model:    "gpt-4",
		System:   "你是助手",
		Messages: []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	msgs := result["messages"].([]any)
	assert.Len(t, msgs, 2)
	firstMsg := msgs[0].(map[string]any)
	assert.Equal(t, "system", firstMsg["role"])
	assert.Equal(t, "你是助手", firstMsg["content"])
}

func TestEncodeRequest_ToolCalls(t *testing.T) {
	input := json.RawMessage(`{"city":"北京"}`)
	req := &canonical.CanonicalRequest{
		Model: "gpt-4",
		Messages: []canonical.CanonicalMessage{
			{
				Role: canonical.RoleAssistant,
				Content: []canonical.ContentBlock{
					canonical.NewToolUseBlock("call_1", "get_weather", input),
				},
			},
		},
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	msgs := result["messages"].([]any)
	assistantMsg := msgs[0].(map[string]any)
	toolCalls, ok := assistantMsg["tool_calls"].([]any)
	require.True(t, ok)
	assert.Len(t, toolCalls, 1)
	tc := toolCalls[0].(map[string]any)
	assert.Equal(t, "call_1", tc["id"])
}

func TestEncodeRequest_Thinking(t *testing.T) {
	req := &canonical.CanonicalRequest{
		Model:    "gpt-4",
		Messages: []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
		Thinking: &canonical.ThinkingConfig{Type: "enabled", Effort: "high"},
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	assert.Equal(t, "high", result["reasoning_effort"])
}

func TestEncodeResponse_Basic(t *testing.T) {
	sr := canonical.StopReasonEndTurn
	resp := &canonical.CanonicalResponse{
		ID:      "resp-1",
		Model:   "gpt-4",
		Content: []canonical.ContentBlock{canonical.NewTextBlock("你好")},
		StopReason: &sr,
		Usage:   canonical.CanonicalUsage{InputTokens: 10, OutputTokens: 5},
	}

	body, err := encodeResponse(resp)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	assert.Equal(t, "resp-1", result["id"])
	assert.Equal(t, "chat.completion", result["object"])

	choices := result["choices"].([]any)
	choice := choices[0].(map[string]any)
	msg := choice["message"].(map[string]any)
	assert.Equal(t, "你好", msg["content"])
	assert.Equal(t, "stop", choice["finish_reason"])
}

func TestEncodeResponse_ToolUse(t *testing.T) {
	sr := canonical.StopReasonToolUse
	input := json.RawMessage(`{"q":"test"}`)
	resp := &canonical.CanonicalResponse{
		ID:      "resp-2",
		Model:   "gpt-4",
		Content: []canonical.ContentBlock{canonical.NewToolUseBlock("call_1", "search", input)},
		StopReason: &sr,
	}

	body, err := encodeResponse(resp)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	choices := result["choices"].([]any)
	msg := choices[0].(map[string]any)["message"].(map[string]any)
	tcs, ok := msg["tool_calls"].([]any)
	require.True(t, ok)
	assert.Len(t, tcs, 1)
}

func TestEncodeModelsResponse(t *testing.T) {
	list := &canonical.CanonicalModelList{
		Models: []canonical.CanonicalModel{
			{ID: "gpt-4", Created: 1700000000, OwnedBy: "openai"},
			{ID: "gpt-3.5-turbo", Created: 1700000001, OwnedBy: "openai"},
		},
	}

	body, err := encodeModelsResponse(list)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	assert.Equal(t, "list", result["object"])
	data := result["data"].([]any)
	assert.Len(t, data, 2)
}

func TestMergeConsecutiveRoles(t *testing.T) {
	messages := []map[string]any{
		{"role": "user", "content": "A"},
		{"role": "user", "content": "B"},
		{"role": "assistant", "content": "C"},
		{"role": "assistant", "content": "D"},
	}

	result := mergeConsecutiveRoles(messages)
	assert.Len(t, result, 2)
	assert.Equal(t, "AB", result[0]["content"])
	assert.Equal(t, "CD", result[1]["content"])
}

func TestMergeConsecutiveRoles_NotOverwriting(t *testing.T) {
	messages := []map[string]any{
		{"role": "user", "content": "你好"},
		{"role": "user", "content": "世界"},
	}

	result := mergeConsecutiveRoles(messages)
	assert.Len(t, result, 1)
	assert.Equal(t, "你好世界", result[0]["content"])
}

func TestEncodeRequest_ToolChoice_Auto(t *testing.T) {
	req := &canonical.CanonicalRequest{
		Model:      "gpt-4",
		Messages:   []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
		ToolChoice: canonical.NewToolChoiceAuto(),
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	assert.Equal(t, "auto", result["tool_choice"])
}

func TestEncodeRequest_ToolChoice_None(t *testing.T) {
	req := &canonical.CanonicalRequest{
		Model:      "gpt-4",
		Messages:   []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
		ToolChoice: canonical.NewToolChoiceNone(),
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	assert.Equal(t, "none", result["tool_choice"])
}

func TestEncodeRequest_ToolChoice_Required(t *testing.T) {
	req := &canonical.CanonicalRequest{
		Model:      "gpt-4",
		Messages:   []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
		ToolChoice: canonical.NewToolChoiceAny(),
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	assert.Equal(t, "required", result["tool_choice"])
}

func TestEncodeRequest_ToolChoice_Named(t *testing.T) {
	req := &canonical.CanonicalRequest{
		Model:      "gpt-4",
		Messages:   []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
		ToolChoice: canonical.NewToolChoiceNamed("my_func"),
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	tc, ok := result["tool_choice"].(map[string]any)
	require.True(t, ok)
	assert.Equal(t, "function", tc["type"])
	fn, ok := tc["function"].(map[string]any)
	require.True(t, ok)
	assert.Equal(t, "my_func", fn["name"])
}

func TestEncodeRequest_OutputFormat_JSONSchema(t *testing.T) {
	schema := json.RawMessage(`{"type":"object","properties":{"name":{"type":"string"}}}`)
	req := &canonical.CanonicalRequest{
		Model:    "gpt-4",
		Messages: []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
		OutputFormat: &canonical.OutputFormat{
			Type:   "json_schema",
			Name:   "my_schema",
			Schema: schema,
		},
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	rf, ok := result["response_format"].(map[string]any)
	require.True(t, ok)
	assert.Equal(t, "json_schema", rf["type"])
	js, ok := rf["json_schema"].(map[string]any)
	require.True(t, ok)
	assert.Equal(t, "my_schema", js["name"])
	assert.NotNil(t, js["schema"])
}

func TestEncodeRequest_OutputFormat_Text(t *testing.T) {
	req := &canonical.CanonicalRequest{
		Model:    "gpt-4",
		Messages: []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	_, hasResponseFormat := result["response_format"]
	assert.False(t, hasResponseFormat)
}

func TestEncodeResponse_Thinking(t *testing.T) {
	sr := canonical.StopReasonEndTurn
	resp := &canonical.CanonicalResponse{
		ID:    "resp-thinking",
		Model: "gpt-4",
		Content: []canonical.ContentBlock{
			canonical.NewTextBlock("回答"),
			canonical.NewThinkingBlock("思考过程"),
		},
		StopReason: &sr,
		Usage:      canonical.CanonicalUsage{InputTokens: 10, OutputTokens: 5},
	}

	body, err := encodeResponse(resp)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	choices := result["choices"].([]any)
	msg := choices[0].(map[string]any)["message"].(map[string]any)
	assert.Equal(t, "回答", msg["content"])
	assert.Equal(t, "思考过程", msg["reasoning_content"])
}

func TestEncodeRequest_Parameters(t *testing.T) {
	temp := 0.5
	maxTokens := 2048
	topP := 0.9
	req := &canonical.CanonicalRequest{
		Model:    "gpt-4",
		Messages: []canonical.CanonicalMessage{{Role: canonical.RoleUser, Content: []canonical.ContentBlock{canonical.NewTextBlock("hi")}}},
		Parameters: canonical.RequestParameters{
			Temperature:   &temp,
			MaxTokens:     &maxTokens,
			TopP:          &topP,
			StopSequences: []string{"STOP", "END"},
		},
	}
	provider := conversion.NewTargetProvider("", "key", "model")

	body, err := encodeRequest(req, provider)
	require.NoError(t, err)

	var result map[string]any
	require.NoError(t, json.Unmarshal(body, &result))
	assert.Equal(t, temp, result["temperature"])
	assert.Equal(t, float64(maxTokens), result["max_completion_tokens"])
	assert.Equal(t, topP, result["top_p"])
	stop, ok := result["stop"].([]any)
	require.True(t, ok)
	assert.Len(t, stop, 2)
	assert.Equal(t, "STOP", stop[0])
	assert.Equal(t, "END", stop[1])
}