package openai

import (
	"encoding/base64"
	"testing"

	"github.com/google/go-cmp/cmp"

	"github.com/ollama/ollama/api"
)

const (
	prefix = `data:image/jpeg;base64,`
	image  = `iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=`
)

func TestFromChatRequest_Basic(t *testing.T) {
	req := ChatCompletionRequest{
		Model: "test-model",
		Messages: []Message{
			{Role: "user", Content: "Hello"},
		},
	}

	result, err := FromChatRequest(req)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if result.Model != "test-model" {
		t.Errorf("expected model 'test-model', got %q", result.Model)
	}

	if len(result.Messages) != 1 {
		t.Fatalf("expected 1 message, got %d", len(result.Messages))
	}

	if result.Messages[0].Role != "user" || result.Messages[0].Content != "Hello" {
		t.Errorf("unexpected message: %+v", result.Messages[0])
	}
}

func TestFromChatRequest_WithImage(t *testing.T) {
	imgData, _ := base64.StdEncoding.DecodeString(image)

	req := ChatCompletionRequest{
		Model: "test-model",
		Messages: []Message{
			{
				Role: "user",
				Content: []any{
					map[string]any{"type": "text", "text": "Hello"},
					map[string]any{
						"type":      "image_url",
						"image_url": map[string]any{"url": prefix + image},
					},
				},
			},
		},
	}

	result, err := FromChatRequest(req)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if len(result.Messages) != 2 {
		t.Fatalf("expected 2 messages, got %d", len(result.Messages))
	}

	if result.Messages[0].Content != "Hello" {
		t.Errorf("expected first message content 'Hello', got %q", result.Messages[0].Content)
	}

	if len(result.Messages[1].Images) != 1 {
		t.Fatalf("expected 1 image, got %d", len(result.Messages[1].Images))
	}

	if string(result.Messages[1].Images[0]) != string(imgData) {
		t.Error("image data mismatch")
	}
}

func TestFromCompleteRequest_Basic(t *testing.T) {
	temp := float32(0.8)
	req := CompletionRequest{
		Model:       "test-model",
		Prompt:      "Hello",
		Temperature: &temp,
	}

	result, err := FromCompleteRequest(req)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if result.Model != "test-model" {
		t.Errorf("expected model 'test-model', got %q", result.Model)
	}

	if result.Prompt != "Hello" {
		t.Errorf("expected prompt 'Hello', got %q", result.Prompt)
	}

	if tempVal, ok := result.Options["temperature"].(float32); !ok || tempVal != 0.8 {
		t.Errorf("expected temperature 0.8, got %v", result.Options["temperature"])
	}
}

func TestToUsage(t *testing.T) {
	resp := api.ChatResponse{
		Metrics: api.Metrics{
			PromptEvalCount: 10,
			EvalCount:       20,
		},
	}

	usage := ToUsage(resp)

	if usage.PromptTokens != 10 {
		t.Errorf("expected PromptTokens 10, got %d", usage.PromptTokens)
	}

	if usage.CompletionTokens != 20 {
		t.Errorf("expected CompletionTokens 20, got %d", usage.CompletionTokens)
	}

	if usage.TotalTokens != 30 {
		t.Errorf("expected TotalTokens 30, got %d", usage.TotalTokens)
	}
}

func TestNewError(t *testing.T) {
	tests := []struct {
		code int
		want string
	}{
		{400, "invalid_request_error"},
		{404, "not_found_error"},
		{500, "api_error"},
	}

	for _, tt := range tests {
		result := NewError(tt.code, "test message")
		if result.Error.Type != tt.want {
			t.Errorf("NewError(%d) type = %q, want %q", tt.code, result.Error.Type, tt.want)
		}
		if result.Error.Message != "test message" {
			t.Errorf("NewError(%d) message = %q, want %q", tt.code, result.Error.Message, "test message")
		}
	}
}

func TestToToolCallsPreservesIDs(t *testing.T) {
	original := []api.ToolCall{
		{
			ID: "call_abc123",
			Function: api.ToolCallFunction{
				Index: 2,
				Name:  "get_weather",
				Arguments: api.ToolCallFunctionArguments{
					"location": "Seattle",
				},
			},
		},
		{
			ID: "call_def456",
			Function: api.ToolCallFunction{
				Index: 7,
				Name:  "get_time",
				Arguments: api.ToolCallFunctionArguments{
					"timezone": "UTC",
				},
			},
		},
	}

	toolCalls := make([]api.ToolCall, len(original))
	copy(toolCalls, original)
	got := ToToolCalls(toolCalls)

	if len(got) != len(original) {
		t.Fatalf("expected %d tool calls, got %d", len(original), len(got))
	}

	expected := []ToolCall{
		{
			ID:    "call_abc123",
			Type:  "function",
			Index: 2,
			Function: struct {
				Name      string `json:"name"`
				Arguments string `json:"arguments"`
			}{
				Name:      "get_weather",
				Arguments: `{"location":"Seattle"}`,
			},
		},
		{
			ID:    "call_def456",
			Type:  "function",
			Index: 7,
			Function: struct {
				Name      string `json:"name"`
				Arguments string `json:"arguments"`
			}{
				Name:      "get_time",
				Arguments: `{"timezone":"UTC"}`,
			},
		},
	}

	if diff := cmp.Diff(expected, got); diff != "" {
		t.Errorf("tool calls mismatch (-want +got):\n%s", diff)
	}

	if diff := cmp.Diff(original, toolCalls); diff != "" {
		t.Errorf("input tool calls mutated (-want +got):\n%s", diff)
	}
}