package api

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"time"

	"github.com/claudia/docs-cli/internal/config"
	"github.com/claudia/docs-cli/pkg/types"
)

// Client is the API client
type Client struct {
	BaseURL    string
	Token      string
	HTTPClient *http.Client
	Timeout    time.Duration
}

// NewClient creates a new API client
func NewClient() (*Client, error) {
	cfg := config.GetConfig()
	if cfg == nil {
		cfg = &config.Config{Server: "http://localhost:8000", Timeout: "30s"}
	}

	timeout, err := time.ParseDuration(cfg.Timeout)
	if err != nil {
		timeout = 30 * time.Second
	}

	return &Client{
		BaseURL: cfg.Server + "/api/v1",
		Token:   cfg.Token,
		HTTPClient: &http.Client{
			Timeout: timeout,
		},
		Timeout: timeout,
	}, nil
}

// SetToken sets the authentication token
func (c *Client) SetToken(token string) {
	c.Token = token
}

// doRequest performs an HTTP request
func (c *Client) doRequest(method, path string, body interface{}) (*http.Response, error) {
	var reqBody io.Reader
	if body != nil {
		jsonData, err := json.Marshal(body)
		if err != nil {
			return nil, fmt.Errorf("failed to marshal request body: %w", err)
		}
		reqBody = bytes.NewBuffer(jsonData)
	}

	url := c.BaseURL + path
	req, err := http.NewRequest(method, url, reqBody)
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	if c.Token != "" {
		req.Header.Set("Authorization", "Bearer "+c.Token)
	}

	return c.HTTPClient.Do(req)
}

// DoRequest performs an HTTP request (exported for auth package)
func (c *Client) DoRequest(method, path string, body interface{}) (*http.Response, error) {
	return c.doRequest(method, path, body)
}

// Response parses the API response
type Response struct {
	Success bool
	Data    interface{}
	Error   *types.ErrorInfo
}

func parseResponse(resp *http.Response) (*types.Response, error) {
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("failed to read response body: %w", err)
	}

	var apiResp types.Response
	if err := json.Unmarshal(body, &apiResp); err != nil {
		return nil, fmt.Errorf("failed to parse response JSON: %w", err)
	}

	return &apiResp, nil
}

func handleError(resp *http.Response, body []byte) error {
	var apiResp types.Response
	if err := json.Unmarshal(body, &apiResp); err != nil {
		return fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(body))
	}
	if apiResp.Error != nil {
		return fmt.Errorf("%s: %s", apiResp.Error.Code, apiResp.Error.Message)
	}
	return fmt.Errorf("HTTP %d: %s", resp.StatusCode, string(body))
}