package daemon

import (
	"encoding/json"
	"fmt"
	"net"
	"os"
	"os/exec"
	"path/filepath"
	"time"

	"git.jrop.me/jonathan/envvault/internal"
)

// Client provides methods to interact with the password daemon
type Client struct {
	socketPath string
}

// NewClient creates a new client for the password daemon
func NewClient(socketPath string) *Client {
	return &Client{
		socketPath: socketPath,
	}
}

// IsRunning checks if the daemon is running
func (c *Client) IsRunning() bool {
	internal.DaemonLog.Printf("Checking if daemon is running at: %s", c.socketPath)
	conn, err := net.Dial("unix", c.socketPath)
	if err != nil {
		internal.DaemonLog.Printf("Daemon is not running: %v", err)
		return false
	}
	conn.Close()
	internal.DaemonLog.Printf("Daemon is running")
	return true
}

func (c *Client) EnsureRunning() error {
	if c.IsRunning() {
		internal.DaemonLog.Printf("Daemon is already running")
		return nil
	}

	internal.Log.Println("Daemon not running, attempting to start it")
	// Spawn daemon in background
	cmd := exec.Command(os.Args[0], "daemon")
	cmd.Stdout = nil
	cmd.Stderr = nil
	if err := cmd.Start(); err != nil {
		internal.Log.Printf("Failed to start daemon: %v", err)
		internal.DaemonLog.Printf("Failed to start daemon: %v", err)
	} else {
		internal.Log.Printf("Started daemon process with PID: %d", cmd.Process.Pid)
		// Detach the process
		cmd.Process.Release()

		// Give daemon time to start
		internal.Log.Println("Waiting for daemon to initialize")
		time.Sleep(100 * time.Millisecond)
	}

	return nil
}

// StorePassword sends the password to the daemon for caching
func (c *Client) StorePassword(password []byte) error {
	internal.DaemonLog.Printf("Storing password in daemon")
	msg := Message{
		Command:  "store",
		Password: string(password),
	}

	internal.DaemonLog.Printf("Sending store message to daemon")
	resp, err := c.sendMessage(msg)
	if err != nil {
		internal.DaemonLog.Printf("Failed to send store message: %v", err)
		return err
	}

	if !resp.Success {
		internal.DaemonLog.Printf("Daemon reported error: %s", resp.Error)
		return fmt.Errorf("failed to store password: %s", resp.Error)
	}

	internal.DaemonLog.Printf("Password stored successfully")
	return nil
}

// RetrievePassword gets the cached password from the daemon
func (c *Client) RetrievePassword() ([]byte, error) {
	internal.DaemonLog.Printf("Retrieving password from daemon")
	msg := Message{
		Command: "retrieve",
	}

	internal.DaemonLog.Printf("Sending retrieve message to daemon")
	resp, err := c.sendMessage(msg)
	if err != nil {
		internal.DaemonLog.Printf("Failed to send retrieve message: %v", err)
		return nil, err
	}

	if !resp.Success {
		internal.DaemonLog.Printf("Daemon reported error: %s", resp.Error)
		return nil, fmt.Errorf("failed to retrieve password: %s", resp.Error)
	}

	internal.DaemonLog.Printf("Password retrieved successfully")
	return []byte(resp.Data), nil
}

// sendMessage sends a message to the daemon and returns the response
func (c *Client) sendMessage(msg Message) (*Response, error) {
	internal.DaemonLog.Printf("Connecting to daemon socket: %s", c.socketPath)
	conn, err := net.Dial("unix", c.socketPath)
	if err != nil {
		internal.DaemonLog.Printf("Failed to connect to daemon: %v", err)
		return nil, fmt.Errorf("failed to connect to daemon: %w", err)
	}
	defer conn.Close()

	internal.DaemonLog.Printf("Connected to daemon, encoding message")
	encoder := json.NewEncoder(conn)
	decoder := json.NewDecoder(conn)

	if err := encoder.Encode(msg); err != nil {
		internal.DaemonLog.Printf("Failed to encode message: %v", err)
		return nil, fmt.Errorf("failed to encode message: %w", err)
	}

	internal.DaemonLog.Printf("Message sent, waiting for response")
	var resp Response
	if err := decoder.Decode(&resp); err != nil {
		internal.DaemonLog.Printf("Failed to decode response: %v", err)
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	internal.DaemonLog.Printf("Response received: success=%v", resp.Success)
	return &resp, nil
}

// GetSocketPath returns the default socket path for the current user
func GetSocketPath() string {
	homeDir, err := os.UserHomeDir()
	if err != nil {
		// Fall back to current directory if home dir can't be determined
		internal.DaemonLog.Printf("Failed to get user home directory: %v", err)
		return filepath.Join(".local/cache/envvault", "daemon.sock")
	}
	runtimeDir := filepath.Join(homeDir, ".local/cache/envvault")
	return filepath.Join(runtimeDir, "daemon.sock")
}