package openai

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

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

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

// testArgs creates ToolCallFunctionArguments from a map (convenience function for tests)
func testArgs(m map[string]any) api.ToolCallFunctionArguments {
	args := api.NewToolCallFunctionArguments()
	for k, v := range m {
		args.Set(k, v)
	}
	return args
}

// argsComparer provides cmp options for comparing ToolCallFunctionArguments by value
var argsComparer = cmp.Comparer(func(a, b api.ToolCallFunctionArguments) bool {
	return cmp.Equal(a.ToMap(), b.ToMap())
})

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: testArgs(map[string]any{
					"location": "Seattle",
				}),
			},
		},
		{
			ID: "call_def456",
			Function: api.ToolCallFunction{
				Index: 7,
				Name:  "get_time",
				Arguments: testArgs(map[string]any{
					"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, argsComparer); 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 TestToChunks_SplitsThinkingAndContent(t *testing.T) {
	resp := api.ChatResponse{
		Model: "test-model",
		Message: api.Message{
			Thinking: "step-by-step",
			Content:  "final answer",
		},
		Done:       true,
		DoneReason: "stop",
	}

	chunks := ToChunks("test-id", resp, false)
	if len(chunks) != 2 {
		t.Fatalf("expected 2 chunks, got %d", len(chunks))
	}

	reasoning := chunks[0].Choices[0]
	if reasoning.Delta.Reasoning != "step-by-step" {
		t.Fatalf("expected reasoning chunk to contain thinking, got %q", reasoning.Delta.Reasoning)
	}
	if reasoning.Delta.Content != "" {
		t.Fatalf("expected reasoning chunk content to be empty, got %v", reasoning.Delta.Content)
	}
	if len(reasoning.Delta.ToolCalls) != 0 {
		t.Fatalf("expected reasoning chunk tool calls to be empty, got %d", len(reasoning.Delta.ToolCalls))
	}
	if reasoning.FinishReason != nil {
		t.Fatalf("expected reasoning chunk finish reason to be nil, got %q", *reasoning.FinishReason)
	}

	content := chunks[1].Choices[0]
	if content.Delta.Reasoning != "" {
		t.Fatalf("expected content chunk reasoning to be empty, got %q", content.Delta.Reasoning)
	}
	if content.Delta.Content != "final answer" {
		t.Fatalf("expected content chunk content %q, got %v", "final answer", content.Delta.Content)
	}
	if content.FinishReason == nil || *content.FinishReason != "stop" {
		t.Fatalf("expected content chunk finish reason %q, got %v", "stop", content.FinishReason)
	}
}

func TestToChunks_SplitsThinkingAndToolCalls(t *testing.T) {
	resp := api.ChatResponse{
		Model: "test-model",
		Message: api.Message{
			Thinking: "need a tool",
			ToolCalls: []api.ToolCall{
				{
					ID: "call_123",
					Function: api.ToolCallFunction{
						Index: 0,
						Name:  "get_weather",
						Arguments: testArgs(map[string]any{
							"location": "Seattle",
						}),
					},
				},
			},
		},
		Done:       true,
		DoneReason: "stop",
	}

	chunks := ToChunks("test-id", resp, false)
	if len(chunks) != 2 {
		t.Fatalf("expected 2 chunks, got %d", len(chunks))
	}

	reasoning := chunks[0].Choices[0]
	if reasoning.Delta.Reasoning != "need a tool" {
		t.Fatalf("expected reasoning chunk to contain thinking, got %q", reasoning.Delta.Reasoning)
	}
	if len(reasoning.Delta.ToolCalls) != 0 {
		t.Fatalf("expected reasoning chunk tool calls to be empty, got %d", len(reasoning.Delta.ToolCalls))
	}
	if reasoning.FinishReason != nil {
		t.Fatalf("expected reasoning chunk finish reason to be nil, got %q", *reasoning.FinishReason)
	}

	toolCallChunk := chunks[1].Choices[0]
	if toolCallChunk.Delta.Reasoning != "" {
		t.Fatalf("expected tool-call chunk reasoning to be empty, got %q", toolCallChunk.Delta.Reasoning)
	}
	if len(toolCallChunk.Delta.ToolCalls) != 1 {
		t.Fatalf("expected one tool call in second chunk, got %d", len(toolCallChunk.Delta.ToolCalls))
	}
	if toolCallChunk.Delta.ToolCalls[0].ID != "call_123" {
		t.Fatalf("expected tool call id %q, got %q", "call_123", toolCallChunk.Delta.ToolCalls[0].ID)
	}
	if toolCallChunk.FinishReason == nil || *toolCallChunk.FinishReason != finishReasonToolCalls {
		t.Fatalf("expected tool-call chunk finish reason %q, got %v", finishReasonToolCalls, toolCallChunk.FinishReason)
	}
}

func TestToChunks_SingleChunkForNonMixedResponses(t *testing.T) {
	toolCalls := []api.ToolCall{
		{
			ID: "call_456",
			Function: api.ToolCallFunction{
				Index: 0,
				Name:  "get_time",
				Arguments: testArgs(map[string]any{
					"timezone": "UTC",
				}),
			},
		},
	}

	tests := []struct {
		name    string
		message api.Message
	}{
		{
			name:    "thinking-only",
			message: api.Message{Thinking: "pondering"},
		},
		{
			name:    "content-only",
			message: api.Message{Content: "hello"},
		},
		{
			name:    "toolcalls-only",
			message: api.Message{ToolCalls: toolCalls},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			resp := api.ChatResponse{
				Model:   "test-model",
				Message: tt.message,
			}

			chunks := ToChunks("test-id", resp, false)
			if len(chunks) != 1 {
				t.Fatalf("expected 1 chunk, got %d", len(chunks))
			}
		})
	}
}

func TestToChunks_SplitsThinkingAndToolCallsWhenNotDone(t *testing.T) {
	resp := api.ChatResponse{
		Model: "test-model",
		Message: api.Message{
			Thinking: "need a tool",
			ToolCalls: []api.ToolCall{
				{
					ID: "call_789",
					Function: api.ToolCallFunction{
						Index: 0,
						Name:  "get_weather",
						Arguments: testArgs(map[string]any{
							"location": "San Francisco",
						}),
					},
				},
			},
		},
		Done: false,
	}

	chunks := ToChunks("test-id", resp, false)
	if len(chunks) != 2 {
		t.Fatalf("expected 2 chunks, got %d", len(chunks))
	}

	reasoning := chunks[0].Choices[0]
	if reasoning.Delta.Reasoning != "need a tool" {
		t.Fatalf("expected reasoning chunk to contain thinking, got %q", reasoning.Delta.Reasoning)
	}
	if reasoning.FinishReason != nil {
		t.Fatalf("expected reasoning chunk finish reason nil, got %v", reasoning.FinishReason)
	}

	toolCallChunk := chunks[1].Choices[0]
	if len(toolCallChunk.Delta.ToolCalls) != 1 {
		t.Fatalf("expected one tool call in second chunk, got %d", len(toolCallChunk.Delta.ToolCalls))
	}
	if toolCallChunk.Delta.ToolCalls[0].ID != "call_789" {
		t.Fatalf("expected tool call id %q, got %q", "call_789", toolCallChunk.Delta.ToolCalls[0].ID)
	}
	if toolCallChunk.FinishReason != nil {
		t.Fatalf("expected tool-call chunk finish reason nil when not done, got %v", toolCallChunk.FinishReason)
	}
}

func TestToChunks_SplitsThinkingAndContentWhenNotDone(t *testing.T) {
	resp := api.ChatResponse{
		Model: "test-model",
		Message: api.Message{
			Thinking: "thinking",
			Content:  "partial content",
		},
		Done: false,
	}

	chunks := ToChunks("test-id", resp, false)
	if len(chunks) != 2 {
		t.Fatalf("expected 2 chunks, got %d", len(chunks))
	}

	reasoning := chunks[0].Choices[0]
	if reasoning.Delta.Reasoning != "thinking" {
		t.Fatalf("expected reasoning chunk to contain thinking, got %q", reasoning.Delta.Reasoning)
	}
	if reasoning.FinishReason != nil {
		t.Fatalf("expected reasoning chunk finish reason nil, got %v", reasoning.FinishReason)
	}

	content := chunks[1].Choices[0]
	if content.Delta.Content != "partial content" {
		t.Fatalf("expected content chunk content %q, got %v", "partial content", content.Delta.Content)
	}
	if content.FinishReason != nil {
		t.Fatalf("expected content chunk finish reason nil when not done, got %v", content.FinishReason)
	}
}

func TestToChunks_SplitSendsLogprobsOnlyOnFirstChunk(t *testing.T) {
	resp := api.ChatResponse{
		Model: "test-model",
		Message: api.Message{
			Thinking: "thinking",
			Content:  "content",
		},
		Logprobs: []api.Logprob{
			{
				TokenLogprob: api.TokenLogprob{
					Token:   "tok",
					Logprob: -0.25,
				},
			},
		},
		Done:       true,
		DoneReason: "stop",
	}

	chunks := ToChunks("test-id", resp, false)
	if len(chunks) != 2 {
		t.Fatalf("expected 2 chunks, got %d", len(chunks))
	}

	first := chunks[0].Choices[0]
	if first.Logprobs == nil {
		t.Fatal("expected first chunk to include logprobs")
	}
	if len(first.Logprobs.Content) != 1 || first.Logprobs.Content[0].Token != "tok" {
		t.Fatalf("unexpected first chunk logprobs: %+v", first.Logprobs.Content)
	}

	second := chunks[1].Choices[0]
	if second.Logprobs != nil {
		t.Fatalf("expected second chunk logprobs to be nil, got %+v", second.Logprobs)
	}
}

func TestToChunk_LegacyMixedThinkingAndContentSingleChunk(t *testing.T) {
	resp := api.ChatResponse{
		Model: "test-model",
		Message: api.Message{
			Thinking: "reasoning",
			Content:  "answer",
		},
		Done:       true,
		DoneReason: "stop",
	}

	chunk := ToChunk("test-id", resp, false)
	if len(chunk.Choices) != 1 {
		t.Fatalf("expected 1 choice, got %d", len(chunk.Choices))
	}

	delta := chunk.Choices[0].Delta
	if delta.Reasoning != "reasoning" {
		t.Fatalf("expected reasoning %q, got %q", "reasoning", delta.Reasoning)
	}
	if delta.Content != "answer" {
		t.Fatalf("expected content %q, got %v", "answer", delta.Content)
	}
}

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)
			}
		})
	}
}

func TestFromImageEditRequest_Basic(t *testing.T) {
	req := ImageEditRequest{
		Model:  "test-model",
		Prompt: "make it blue",
		Image:  prefix + image,
	}

	result, err := FromImageEditRequest(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 != "make it blue" {
		t.Errorf("expected prompt 'make it blue', got %q", result.Prompt)
	}

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

func TestFromImageEditRequest_WithSize(t *testing.T) {
	req := ImageEditRequest{
		Model:  "test-model",
		Prompt: "make it blue",
		Image:  prefix + image,
		Size:   "512x768",
	}

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

	if result.Width != 512 {
		t.Errorf("expected width 512, got %d", result.Width)
	}

	if result.Height != 768 {
		t.Errorf("expected height 768, got %d", result.Height)
	}
}

func TestFromImageEditRequest_WithSeed(t *testing.T) {
	seed := int64(12345)
	req := ImageEditRequest{
		Model:  "test-model",
		Prompt: "make it blue",
		Image:  prefix + image,
		Seed:   &seed,
	}

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

	if result.Options == nil {
		t.Fatal("expected options to be set")
	}

	if result.Options["seed"] != seed {
		t.Errorf("expected seed %d, got %v", seed, result.Options["seed"])
	}
}

func TestFromImageEditRequest_InvalidImage(t *testing.T) {
	req := ImageEditRequest{
		Model:  "test-model",
		Prompt: "make it blue",
		Image:  "not-valid-base64",
	}

	_, err := FromImageEditRequest(req)
	if err == nil {
		t.Error("expected error for invalid image")
	}
}