package hetzner

import (
	"fmt"
	"time"

	"github.com/go-resty/resty/v2"
)

const (
	hetznerAPIBaseURL = "https://api.hetzner.cloud/v1"
)

type Client struct {
	apiKey  string
	resty   *resty.Client
}

type Server struct {
	ID       int           `json:"id"`
	Name     string        `json:"name"`
	Status   string        `json:"status"`
	PublicNet PublicNet    `json:"public_net"`
}

type PublicNet struct {
	IPv4 IPv4Info `json:"ipv4"`
}

type IPv4Info struct {
	IP string `json:"ip"`
}

type ServerResponse struct {
	Server Server `json:"server"`
}

type ServersResponse struct {
	Servers []Server `json:"servers"`
}

type CreateServerRequest struct {
	Name       string            `json:"name"`
	ServerType string            `json:"server_type"`
	Image      string            `json:"image"`
	Location   string            `json:"location,omitempty"`
	SSHKeys    []int             `json:"ssh_keys,omitempty"`
	UserData   string            `json:"user_data,omitempty"`
	Networks   []int             `json:"networks,omitempty"`
	Labels     map[string]string `json:"labels,omitempty"`
}

func NewClient(apiKey string) *Client {
	client := resty.New()
	client.SetBaseURL(hetznerAPIBaseURL)
	client.SetHeader("Authorization", fmt.Sprintf("Bearer %s", apiKey))
	client.SetTimeout(30 * time.Second)

	return &Client{
		apiKey: apiKey,
		resty:  client,
	}
}

func (c *Client) CreateServer(req CreateServerRequest) (*Server, error) {
	var resp ServerResponse

	httpResp, err := c.resty.R().
		SetBody(req).
		SetResult(&resp).
		Post("/servers")

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

	if httpResp.IsError() {
		return nil, fmt.Errorf("API error: %s - %s", httpResp.Status(), string(httpResp.Body()))
	}

	return &resp.Server, nil
}

func (c *Client) GetServer(serverID int) (*Server, error) {
	var resp ServerResponse

	httpResp, err := c.resty.R().
		SetResult(&resp).
		Get(fmt.Sprintf("/servers/%d", serverID))

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

	if httpResp.IsError() {
		return nil, fmt.Errorf("API error: %s - %s", httpResp.Status(), string(httpResp.Body()))
	}

	return &resp.Server, nil
}

func (c *Client) DeleteServer(serverID int) error {
	httpResp, err := c.resty.R().
		Delete(fmt.Sprintf("/servers/%d", serverID))

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

	if httpResp.IsError() {
		return fmt.Errorf("API error: %s - %s", httpResp.Status(), string(httpResp.Body()))
	}

	return nil
}

func (c *Client) WaitForServerReady(serverID int, timeout time.Duration) error {
	deadline := time.Now().Add(timeout)
	ticker := time.NewTicker(5 * time.Second)
	defer ticker.Stop()

	for {
		select {
		case <-ticker.C:
			server, err := c.GetServer(serverID)
			if err != nil {
				return fmt.Errorf("failed to check server status: %w", err)
			}

			if server.Status == "running" {
				return nil
			}

			if time.Now().After(deadline) {
				return fmt.Errorf("timeout waiting for server to be ready (current status: %s)", server.Status)
			}
		case <-time.After(timeout):
			return fmt.Errorf("timeout waiting for server to be ready")
		}
	}
}

func (c *Client) GetServerIP(serverID int) (string, error) {
	server, err := c.GetServer(serverID)
	if err != nil {
		return "", err
	}

	if server.PublicNet.IPv4.IP == "" {
		return "", fmt.Errorf("server has no public IP address")
	}

	return server.PublicNet.IPv4.IP, nil
}

func (c *Client) ListServers() ([]Server, error) {
	var resp ServersResponse

	httpResp, err := c.resty.R().
		SetResult(&resp).
		Get("/servers")

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

	if httpResp.IsError() {
		return nil, fmt.Errorf("API error: %s - %s", httpResp.Status(), string(httpResp.Body()))
	}

	return resp.Servers, nil
}