import struct
import zlib
from pathlib import Path
from rich.progress import Progress, SpinnerColumn, TextColumn, BarColumn, DownloadColumn, TransferSpeedColumn, TimeRemainingColumn
from core.utils import console, console_err
from core.protocol import COMMANDS

class put_fw:
    def __init__(self, bus):
        self.bus = bus

    def get(self, file_path: str):
        try:
            p = Path(file_path)
            if not p.exists() or not p.is_file():
                console_err.print(f"Fehler: Firmware-Datei existiert nicht: {file_path}")
                return None
            
            file_size = p.stat().st_size
            with open(p, 'rb') as f:
                file_data = f.read()
        except Exception as e:
            console_err.print(f"Lese-Fehler: {e}")
            return None

        # 1. Schritt: Löschvorgang mit minimalem Feedback
        with Progress(
            SpinnerColumn(),
            TextColumn("[progress.description]{task.description}"),
            BarColumn(),
            console=console,
            transient=True
        ) as progress:
            erase_task = progress.add_task("Lösche Firmware Slot...", total=None)
            
            payload = struct.pack('<I', file_size)
            self.bus.send_request(COMMANDS['put_fw'], payload)
            
            # Warten auf ACK (Balken pulsiert ohne Byte-Anzeige)
            self.bus.receive_ack(timeout=10.0)
            progress.update(erase_task, description="✓ Slot gelöscht", completed=100, total=100)

        # 2. Schritt: Eigentlicher Transfer mit allen Metriken (Bytes, Speed, Time)
        with Progress(
            SpinnerColumn(),
            TextColumn("[progress.description]{task.description}"),
            BarColumn(),
            DownloadColumn(),
            TransferSpeedColumn(),
            "•",
            TimeRemainingColumn(),
            console=console,
            transient=False
        ) as progress:
            transfer_task = progress.add_task("Sende Firmware...", total=file_size)
            
            stream_res = self.bus.send_stream(
                file_data, 
                progress_callback=lambda sent, total: progress.update(transfer_task, total=total, completed=sent)
            )  
        
        if not stream_res: 
            return None
        
        remote_crc = stream_res.get('crc32')
        local_crc = zlib.crc32(file_data) & 0xFFFFFFFF

        return {
            'success': local_crc == remote_crc,
            'source_path': file_path,
            'crc32_remote': remote_crc,
            'crc32_local': local_crc,
            'size': file_size,
            'duration': stream_res.get('duration')
        }

    def print(self, result):
        if not result: 
            return

        if result['success']:
            console.print(f"✓ Firmware [info]{result['source_path']}[/info] erfolgreich in Slot 1 geschrieben.")
            console.print("  [warning]Achtung:[/warning] Das Image ist als 'Pending' markiert. Führe 'reboot' aus, um das Update zu installieren.")
        else:
            console_err.print(f"❌ CRC-FEHLER: Die Firmware wurde korrumpiert übertragen!")
        
        console.print(f"  • Größe:      [info]{result['size'] / 1024:.2f} KB[/info]")
        console.print(f"  • Remote CRC: [info]{result['crc32_remote']:08X}[/info]")
        console.print(f"  • Local CRC:  [info]{result['crc32_local']:08X}[/info]")