package glm

import (
	"context"
	"fmt"
	"tm/pkg/logger"
)

// SDK provides a high-level interface for the GLM service
type SDK struct {
	service GLMService
	client  *Client
	config  *Config
}

// New creates a new GLM SDK with the provided configuration and logger
func New(config *Config, logger logger.Logger) (*SDK, error) {
	cfg := DefaultConfig()
	if config.BaseURL != "" {
		cfg.BaseURL = config.BaseURL
	}
	if config.APIKey != "" {
		cfg.APIKey = config.APIKey
	}
	if config.Timeout != 0 {
		cfg.Timeout = config.Timeout
	}
	if config.RetryAttempts != 0 {
		cfg.RetryAttempts = config.RetryAttempts
	}
	if config.RetryDelay != 0 {
		cfg.RetryDelay = config.RetryDelay
	}
	if config.EnableLogging {
		cfg.EnableLogging = config.EnableLogging
	}
	if config.UserAgent != "" {
		cfg.UserAgent = config.UserAgent
	}
	if config.DefaultModel != "" {
		cfg.DefaultModel = config.DefaultModel
	}
	if config.DefaultMaxTokens != 0 {
		cfg.DefaultMaxTokens = config.DefaultMaxTokens
	}
	if config.DefaultTopP != 0 {
		cfg.DefaultTopP = config.DefaultTopP
	}
	if config.DefaultTemperature != 0 {
		cfg.DefaultTemperature = config.DefaultTemperature
	}
	if config.DefaultFrequencyPenalty != 0 {
		cfg.DefaultFrequencyPenalty = config.DefaultFrequencyPenalty
	}
	if config.DefaultPresencePenalty != 0 {
		cfg.DefaultPresencePenalty = config.DefaultPresencePenalty
	}
	if config.EnableStreaming {
		cfg.EnableStreaming = config.EnableStreaming
	}
	if config.EnableThinking {
		cfg.EnableThinking = config.EnableThinking
	}
	if config.TranslationOptions.Model != "" {
		cfg.TranslationOptions.Model = config.TranslationOptions.Model
	}
	if config.TranslationOptions.MaxTokens != 0 {
		cfg.TranslationOptions.MaxTokens = config.TranslationOptions.MaxTokens
	}
	if config.TranslationOptions.Temperature != 0 {
		cfg.TranslationOptions.Temperature = config.TranslationOptions.Temperature
	}
	if config.TranslationOptions.FrequencyPenalty != 0 {
		cfg.TranslationOptions.FrequencyPenalty = config.TranslationOptions.FrequencyPenalty
	}
	if config.TranslationOptions.PresencePenalty != 0 {
		cfg.TranslationOptions.PresencePenalty = config.TranslationOptions.PresencePenalty
	}
	if config.TranslationOptions.TopP != 0 {
		cfg.TranslationOptions.TopP = config.TranslationOptions.TopP
	}
	if config.TranslationOptions.EnableThinking {
		cfg.TranslationOptions.EnableThinking = config.TranslationOptions.EnableThinking
	}

	client, err := NewClient(cfg, logger)
	if err != nil {
		return nil, err
	}

	service := NewService(client)

	return &SDK{
		service: service,
		client:  client,
		config:  cfg,
	}, nil
}

// ChatCompletion performs a chat completion request
func (s *SDK) ChatCompletion(ctx context.Context, req *ChatCompletionRequest) (*ChatCompletionResponse, error) {
	return s.service.ChatCompletion(ctx, req)
}

// StreamChatCompletion performs a streaming chat completion request
func (s *SDK) StreamChatCompletion(ctx context.Context, req *ChatCompletionRequest, onChunk func(*StreamChatCompletionResponse) error) error {
	return s.service.StreamChatCompletion(ctx, req, onChunk)
}

// ListModels lists available models
func (s *SDK) ListModels(ctx context.Context) (*ModelsResponse, error) {
	return s.service.ListModels(ctx)
}

// Health checks if the GLM service is available
func (s *SDK) Health(ctx context.Context) error {
	return s.service.Health(ctx)
}

// QuickChat is a convenience method for simple chat interactions
func (s *SDK) QuickChat(ctx context.Context, userMessage string) (string, error) {
	req := &ChatCompletionRequest{
		Model: s.config.DefaultModel,
		Messages: []Message{
			{
				Role:    MessageRoleUser,
				Content: userMessage,
			},
		},
		MaxTokens:        s.config.DefaultMaxTokens,
		TopP:             s.config.DefaultTopP,
		Temperature:      s.config.DefaultTemperature,
		FrequencyPenalty: s.config.DefaultFrequencyPenalty,
		PresencePenalty:  s.config.DefaultPresencePenalty,
	}

	if s.config.EnableThinking {
		req.Thinking = &Thinking{Type: "true"}
	}

	resp, err := s.ChatCompletion(ctx, req)
	if err != nil {
		return "", err
	}

	if len(resp.Choices) == 0 {
		return "", ErrInvalidResponse("no choices returned")
	}

	return resp.Choices[0].Message.Content, nil
}

// QuickChatWithSystem is a convenience method for chat with system prompt
func (s *SDK) QuickChatWithSystem(ctx context.Context, systemPrompt, userMessage string) (string, error) {
	req := &ChatCompletionRequest{
		Model: s.config.DefaultModel,
		Messages: []Message{
			{
				Role:    MessageRoleSystem,
				Content: systemPrompt,
			},
			{
				Role:    MessageRoleUser,
				Content: userMessage,
			},
		},
		MaxTokens:        s.config.DefaultMaxTokens,
		TopP:             s.config.DefaultTopP,
		Temperature:      s.config.DefaultTemperature,
		FrequencyPenalty: s.config.DefaultFrequencyPenalty,
		PresencePenalty:  s.config.DefaultPresencePenalty,
	}

	if s.config.EnableThinking {
		req.Thinking = &Thinking{Type: "true"}
	}

	resp, err := s.ChatCompletion(ctx, req)
	if err != nil {
		return "", err
	}

	if len(resp.Choices) == 0 {
		return "", ErrInvalidResponse("no choices returned")
	}

	return resp.Choices[0].Message.Content, nil
}

// TranslateOptions represents options for translation
type TranslateOptions struct {
	Model            string  `json:"model,omitempty"`
	MaxTokens        int     `json:"max_tokens,omitempty"`
	Temperature      float64 `json:"temperature,omitempty"`
	FrequencyPenalty float64 `json:"frequency_penalty,omitempty"`
	PresencePenalty  float64 `json:"presence_penalty,omitempty"`
	TopP             float64 `json:"top_p,omitempty"`
	EnableThinking   *bool   `json:"enable_thinking,omitempty"`
}

// Translate is a convenience method for translation tasks using dynamic configuration parameters optimized for translation
func (s *SDK) Translate(ctx context.Context, text, fromLang, toLang string) (string, error) {
	systemPrompt := "You are a high-precision translator specializing in professional tender documents. Always respond with only the translated text — no explanations, notes, or markdown formatting."

	userMessage := fmt.Sprintf("Translate the following text from %s to %s accurately and professionally:\n\"%s\"", fromLang, toLang, text)

	// Build request with custom options or defaults
	req := &ChatCompletionRequest{
		Model: s.config.TranslationOptions.Model,
		Messages: []Message{
			{
				Role:    MessageRoleSystem,
				Content: systemPrompt,
			},
			{
				Role:    MessageRoleUser,
				Content: userMessage,
			},
		},
		MaxTokens:        s.config.TranslationOptions.MaxTokens,
		TopP:             s.config.TranslationOptions.TopP,
		Temperature:      s.config.TranslationOptions.Temperature,
		FrequencyPenalty: s.config.TranslationOptions.FrequencyPenalty,
		PresencePenalty:  s.config.TranslationOptions.PresencePenalty,
	}

	resp, err := s.ChatCompletion(ctx, req)
	if err != nil {
		return "", err
	}

	if len(resp.Choices) == 0 {
		return "", ErrInvalidResponse("no choices returned")
	}

	return resp.Choices[0].Message.Content, nil
}

// StreamQuickChat is a convenience method for streaming chat interactions
func (s *SDK) StreamQuickChat(ctx context.Context, userMessage string, onChunk func(string) error) error {
	req := &ChatCompletionRequest{
		Model: s.config.DefaultModel,
		Messages: []Message{
			{
				Role:    MessageRoleUser,
				Content: userMessage,
			},
		},
		MaxTokens:        s.config.DefaultMaxTokens,
		TopP:             s.config.DefaultTopP,
		Temperature:      s.config.DefaultTemperature,
		FrequencyPenalty: s.config.DefaultFrequencyPenalty,
		PresencePenalty:  s.config.DefaultPresencePenalty,
		Stream:           true,
	}

	if s.config.EnableThinking {
		req.Thinking = &Thinking{Type: "true"}
	}

	return s.StreamChatCompletion(ctx, req, func(chunk *StreamChatCompletionResponse) error {
		if len(chunk.Choices) > 0 && chunk.Choices[0].Delta.Content != "" {
			return onChunk(chunk.Choices[0].Delta.Content)
		}
		return nil
	})
}

// GetService returns the underlying service for advanced usage
func (s *SDK) GetService() GLMService {
	return s.service
}

// GetConfig returns the current configuration
func (s *SDK) GetConfig() *Config {
	return s.config
}