package tui

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

// APIClient provides a client for interacting with the Atlas API
type APIClient struct {
	baseURL    string
	httpClient *http.Client
	token      string
}

// NewAPIClient creates a new API client
func NewAPIClient(baseURL string) *APIClient {
	return &APIClient{
		baseURL: baseURL,
		httpClient: &http.Client{
			Timeout: 30 * time.Second,
		},
	}
}

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

// Login authenticates with the API
func (c *APIClient) Login(username, password string) (string, error) {
	reqBody := map[string]string{
		"username": username,
		"password": password,
	}

	body, err := json.Marshal(reqBody)
	if err != nil {
		return "", err
	}

	req, err := http.NewRequest("POST", c.baseURL+"/api/v1/auth/login", bytes.NewReader(body))
	if err != nil {
		return "", err
	}

	req.Header.Set("Content-Type", "application/json")

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return "", fmt.Errorf("request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return "", fmt.Errorf("login failed: %s", string(body))
	}

	var result map[string]interface{}
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return "", err
	}

	token, ok := result["token"].(string)
	if !ok {
		return "", fmt.Errorf("no token in response")
	}

	c.SetToken(token)
	return token, nil
}

// Get performs a GET request
func (c *APIClient) Get(path string) ([]byte, error) {
	req, err := http.NewRequest("GET", c.baseURL+path, nil)
	if err != nil {
		return nil, err
	}

	if c.token != "" {
		req.Header.Set("Authorization", "Bearer "+c.token)
	}

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request failed: %w", err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	if resp.StatusCode >= 400 {
		return nil, fmt.Errorf("API error (status %d): %s", resp.StatusCode, string(body))
	}

	return body, nil
}

// Post performs a POST request
func (c *APIClient) Post(path string, data interface{}) ([]byte, error) {
	body, err := json.Marshal(data)
	if err != nil {
		return nil, err
	}

	req, err := http.NewRequest("POST", c.baseURL+path, bytes.NewReader(body))
	if err != nil {
		return nil, err
	}

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

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request failed: %w", err)
	}
	defer resp.Body.Close()

	respBody, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	if resp.StatusCode >= 400 {
		return nil, fmt.Errorf("API error (status %d): %s", resp.StatusCode, string(respBody))
	}

	return respBody, nil
}

// Delete performs a DELETE request
func (c *APIClient) Delete(path string) error {
	req, err := http.NewRequest("DELETE", c.baseURL+path, nil)
	if err != nil {
		return err
	}

	if c.token != "" {
		req.Header.Set("Authorization", "Bearer "+c.token)
	}

	resp, err := c.httpClient.Do(req)
	if err != nil {
		return fmt.Errorf("request failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode >= 400 {
		body, _ := io.ReadAll(resp.Body)
		return fmt.Errorf("API error (status %d): %s", resp.StatusCode, string(body))
	}

	return nil
}