package providers

import (
	"context"
	"encoding/json"
	"fmt"
	"time"

	"github.com/go-resty/resty/v2"
	"gophergate/internal/config"
	"gophergate/internal/models"
)

type GrokProvider struct {
	client *resty.Client
	config config.GrokConfig
	apiKey string
}

func NewGrokProvider(cfg config.GrokConfig, apiKey string) *GrokProvider {
	return &GrokProvider{
		client: resty.New().SetTimeout(10 * time.Minute),
		config: cfg,
		apiKey: apiKey,
	}
}

func (p *GrokProvider) Name() string {
	return "grok"
}

func (p *GrokProvider) ChatCompletion(ctx context.Context, req *models.UnifiedRequest) (*models.ChatCompletionResponse, error) {
	messagesJSON, err := MessagesToOpenAIJSON(req.Messages)
	if err != nil {
		return nil, fmt.Errorf("failed to convert messages: %w", err)
	}

	body := BuildOpenAIBody(req, messagesJSON, false)

	resp, err := p.client.R().
		SetContext(ctx).
		SetHeader("Authorization", "Bearer "+p.apiKey).
		SetBody(body).
		Post(fmt.Sprintf("%s/chat/completions", p.config.BaseURL))

	if err != nil {
		return nil, fmt.Errorf("request failed: %w", err)
	}

	if !resp.IsSuccess() {
		return nil, fmt.Errorf("Grok API error (%d): %s", resp.StatusCode(), resp.String())
	}

	var respJSON map[string]interface{}
	if err := json.Unmarshal(resp.Body(), &respJSON); err != nil {
		return nil, fmt.Errorf("failed to parse response: %w", err)
	}

	return ParseOpenAIResponse(respJSON, req.Model)
}

func (p *GrokProvider) ChatCompletionStream(ctx context.Context, req *models.UnifiedRequest) (<-chan *models.ChatCompletionStreamResponse, error) {
	messagesJSON, err := MessagesToOpenAIJSON(req.Messages)
	if err != nil {
		return nil, fmt.Errorf("failed to convert messages: %w", err)
	}

	body := BuildOpenAIBody(req, messagesJSON, true)

	resp, err := p.client.R().
		SetContext(ctx).
		SetHeader("Authorization", "Bearer "+p.apiKey).
		SetBody(body).
		SetDoNotParseResponse(true).
		Post(fmt.Sprintf("%s/chat/completions", p.config.BaseURL))

	if err != nil {
		return nil, fmt.Errorf("request failed: %w", err)
	}

	if !resp.IsSuccess() {
		return nil, fmt.Errorf("Grok API error (%d): %s", resp.StatusCode(), resp.String())
	}

	ch := make(chan *models.ChatCompletionStreamResponse)

	go func() {
		defer close(ch)
		err := StreamOpenAI(resp.RawBody(), ch)
		if err != nil {
			fmt.Printf("Grok Stream error: %v\n", err)
		}
	}()

	return ch, nil
}

func (p *GrokProvider) ImageGeneration(ctx context.Context, req *models.ImageGenerationRequest) (*models.ImageGenerationResponse, error) {
	return nil, fmt.Errorf("grok does not support image generation")
}

func (p *GrokProvider) Responses(ctx context.Context, req *models.ResponsesRequest) (*models.ResponsesResponse, error) {
	return nil, fmt.Errorf("responses API not supported by grok")
}

func (p *GrokProvider) ResponsesStream(ctx context.Context, req *models.ResponsesRequest) (<-chan *models.ResponsesStreamChunk, error) {
	return nil, fmt.Errorf("responses API not supported by grok")
}
