package openai

import (
	"encoding/base64"
	"testing"
	"time"

	"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)
	}
}

func TestFromChatRequest_WithLogprobs(t *testing.T) {
	trueVal := true

	req := ChatCompletionRequest{
		Model: "test-model",
		Messages: []Message{
			{Role: "user", Content: "Hello"},
		},
		Logprobs:    &trueVal,
		TopLogprobs: 5,
	}

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

	if !result.Logprobs {
		t.Error("expected Logprobs to be true")
	}

	if result.TopLogprobs != 5 {
		t.Errorf("expected TopLogprobs to be 5, got %d", result.TopLogprobs)
	}
}

func TestFromChatRequest_LogprobsDefault(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.Logprobs {
		t.Error("expected Logprobs to be false by default")
	}

	if result.TopLogprobs != 0 {
		t.Errorf("expected TopLogprobs to be 0 by default, got %d", result.TopLogprobs)
	}
}

func TestFromCompleteRequest_WithLogprobs(t *testing.T) {
	logprobsVal := 5

	req := CompletionRequest{
		Model:    "test-model",
		Prompt:   "Hello",
		Logprobs: &logprobsVal,
	}

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

	if !result.Logprobs {
		t.Error("expected Logprobs to be true")
	}

	if result.TopLogprobs != 5 {
		t.Errorf("expected TopLogprobs to be 5, got %d", result.TopLogprobs)
	}
}

func TestToChatCompletion_WithLogprobs(t *testing.T) {
	createdAt := time.Unix(1234567890, 0)
	resp := api.ChatResponse{
		Model:     "test-model",
		CreatedAt: createdAt,
		Message:   api.Message{Role: "assistant", Content: "Hello there"},
		Logprobs: []api.Logprob{
			{
				TokenLogprob: api.TokenLogprob{
					Token:   "Hello",
					Logprob: -0.5,
				},
				TopLogprobs: []api.TokenLogprob{
					{Token: "Hello", Logprob: -0.5},
					{Token: "Hi", Logprob: -1.2},
				},
			},
			{
				TokenLogprob: api.TokenLogprob{
					Token:   " there",
					Logprob: -0.3,
				},
				TopLogprobs: []api.TokenLogprob{
					{Token: " there", Logprob: -0.3},
					{Token: " world", Logprob: -1.5},
				},
			},
		},
		Done: true,
		Metrics: api.Metrics{
			PromptEvalCount: 5,
			EvalCount:       2,
		},
	}

	id := "test-id"

	result := ToChatCompletion(id, resp)

	if result.Id != id {
		t.Errorf("expected Id %q, got %q", id, result.Id)
	}

	if result.Created != 1234567890 {
		t.Errorf("expected Created %d, got %d", int64(1234567890), result.Created)
	}

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

	choice := result.Choices[0]
	if choice.Message.Content != "Hello there" {
		t.Errorf("expected content %q, got %q", "Hello there", choice.Message.Content)
	}

	if choice.Logprobs == nil {
		t.Fatal("expected Logprobs to be present")
	}

	if len(choice.Logprobs.Content) != 2 {
		t.Fatalf("expected 2 logprobs, got %d", len(choice.Logprobs.Content))
	}

	// Verify first logprob
	if choice.Logprobs.Content[0].Token != "Hello" {
		t.Errorf("expected first token %q, got %q", "Hello", choice.Logprobs.Content[0].Token)
	}
	if choice.Logprobs.Content[0].Logprob != -0.5 {
		t.Errorf("expected first logprob -0.5, got %f", choice.Logprobs.Content[0].Logprob)
	}
	if len(choice.Logprobs.Content[0].TopLogprobs) != 2 {
		t.Errorf("expected 2 top_logprobs, got %d", len(choice.Logprobs.Content[0].TopLogprobs))
	}

	// Verify second logprob
	if choice.Logprobs.Content[1].Token != " there" {
		t.Errorf("expected second token %q, got %q", " there", choice.Logprobs.Content[1].Token)
	}
}

func TestToChatCompletion_WithoutLogprobs(t *testing.T) {
	createdAt := time.Unix(1234567890, 0)
	resp := api.ChatResponse{
		Model:     "test-model",
		CreatedAt: createdAt,
		Message:   api.Message{Role: "assistant", Content: "Hello"},
		Done:      true,
		Metrics: api.Metrics{
			PromptEvalCount: 5,
			EvalCount:       1,
		},
	}

	id := "test-id"

	result := ToChatCompletion(id, resp)

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

	// When no logprobs, Logprobs should be nil
	if result.Choices[0].Logprobs != nil {
		t.Error("expected Logprobs to be nil when not requested")
	}
}

func TestFromChatRequest_TopLogprobsRange(t *testing.T) {
	tests := []struct {
		name        string
		topLogprobs int
		expectValid bool
	}{
		{name: "valid: 0", topLogprobs: 0, expectValid: true},
		{name: "valid: 1", topLogprobs: 1, expectValid: true},
		{name: "valid: 10", topLogprobs: 10, expectValid: true},
		{name: "valid: 20", topLogprobs: 20, expectValid: true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			trueVal := true
			req := ChatCompletionRequest{
				Model: "test-model",
				Messages: []Message{
					{Role: "user", Content: "Hello"},
				},
				Logprobs:    &trueVal,
				TopLogprobs: tt.topLogprobs,
			}

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

			if result.TopLogprobs != tt.topLogprobs {
				t.Errorf("expected TopLogprobs %d, got %d", tt.topLogprobs, result.TopLogprobs)
			}
		})
	}
}