import os
import platform
import random
import re

import threading
from filelock import FileLock
import uuid
import zipfile

from time import sleep
import shutil
import psutil
import subprocess
import requests
from tqdm import tqdm

import logging

from desktop_env.providers.base import VMManager

logger = logging.getLogger("desktopenv.providers.vmware.VMwareVMManager")
logger.setLevel(logging.INFO)

MAX_RETRY_TIMES = 10
UBUNTU_ARM_URL = "https://huggingface.co/datasets/xlangai/ubuntu_arm/resolve/main/Ubuntu.zip"
UBUNTU_X86_URL = "https://huggingface.co/datasets/xlangai/ubuntu_x86/resolve/main/Ubuntu.zip"
DOWNLOADED_FILE_NAME = "Ubuntu.zip"
REGISTRY_PATH = '.vmware_vms'
VMS_DIR = "./vmware_vm_data"
update_lock = threading.Lock()


def generate_new_vm_name(vms_dir):
    registry_idx = 0
    while True:
        attempted_new_name = f"Ubuntu{registry_idx}"
        if os.path.exists(
                os.path.join(vms_dir, attempted_new_name, attempted_new_name, attempted_new_name + ".vmx")):
            registry_idx += 1
        else:
            return attempted_new_name


def _update_vm(vmx_path, target_vm_name):
    """Update the VMX file with the new VM name and other parameters, so that the VM can be started successfully without conflict with the original VM."""
    with update_lock:
        dir_path, vmx_file = os.path.split(vmx_path)

        def _generate_mac_address():
            # VMware MAC address range starts with 00:0c:29
            mac = [0x00, 0x0c, 0x29,
                   random.randint(0x00, 0x7f),
                   random.randint(0x00, 0xff),
                   random.randint(0x00, 0xff)]
            return ':'.join(map(lambda x: "%02x" % x, mac))

        # Backup the original file
        with open(vmx_path, 'r') as file:
            original_content = file.read()

        # Generate new values
        new_uuid_bios = str(uuid.uuid4())
        new_uuid_location = str(uuid.uuid4())
        new_mac_address = _generate_mac_address()
        new_vmci_id = str(random.randint(-2147483648, 2147483647))  # Random 32-bit integer

        # Update the content
        updated_content = re.sub(r'displayName = ".*?"', f'displayName = "{target_vm_name}"', original_content)
        updated_content = re.sub(r'uuid.bios = ".*?"', f'uuid.bios = "{new_uuid_bios}"', updated_content)
        updated_content = re.sub(r'uuid.location = ".*?"', f'uuid.location = "{new_uuid_location}"', updated_content)
        updated_content = re.sub(r'ethernet0.generatedAddress = ".*?"',
                                 f'ethernet0.generatedAddress = "{new_mac_address}"',
                                 updated_content)
        updated_content = re.sub(r'vmci0.id = ".*?"', f'vmci0.id = "{new_vmci_id}"', updated_content)

        # Write the updated content back to the file
        with open(vmx_path, 'w') as file:
            file.write(updated_content)

        logger.info(".vmx file updated successfully.")

        vmx_file_base_name = os.path.splitext(vmx_file)[0]

        assert vmx_file == "Ubuntu.vmx", "The VMX file should be named 'Ubuntu.vmx'."
        files_to_rename = ['vmx', 'nvram', 'vmsd', 'vmxf']

        for ext in files_to_rename:
            original_file = os.path.join(dir_path, f"{vmx_file_base_name}.{ext}")
            target_file = os.path.join(dir_path, f"{target_vm_name}.{ext}")
            os.rename(original_file, target_file)

        # Update the dir_path to the target vm_name, only replace the last character
        # Split the path into parts up to the last folder
        path_parts = dir_path.rstrip(os.sep).split(os.sep)
        path_parts[-1] = target_vm_name
        target_dir_path = os.sep.join(path_parts)
        os.rename(dir_path, target_dir_path)

        logger.info("VM files renamed successfully.")


def _install_vm(vm_name, vms_dir, downloaded_file_name, original_vm_name="Ubuntu"):
    os.makedirs(vms_dir, exist_ok=True)

    def __download_and_unzip_vm():
        # Determine the platform and CPU architecture to decide the correct VM image to download
        if platform.system() == 'Darwin':  # macOS
            # if os.uname().machine == 'arm64':  # Apple Silicon
            url = UBUNTU_ARM_URL
        # else:
        #     url = UBUNTU_X86_URL
        elif platform.machine().lower() in ['amd64', 'x86_64']:
            url = UBUNTU_X86_URL
        else:
            raise Exception("Unsupported platform or architecture")

        # Download the virtual machine image
        logger.info("Downloading the virtual machine image...")
        downloaded_size = 0

        while True:
            downloaded_file_path = os.path.join(vms_dir, downloaded_file_name)
            headers = {}
            if os.path.exists(downloaded_file_path):
                downloaded_size = os.path.getsize(downloaded_file_path)
                headers["Range"] = f"bytes={downloaded_size}-"

            with requests.get(url, headers=headers, stream=True) as response:
                if response.status_code == 416:
                    # This means the range was not satisfiable, possibly the file was fully downloaded
                    logger.info("Fully downloaded or the file sized changed.")
                    break

                response.raise_for_status()
                total_size = int(response.headers.get('content-length', 0))

                with open(downloaded_file_path, "ab") as file, tqdm(
                        desc="Progress",
                        total=total_size,
                        unit='iB',
                        unit_scale=True,
                        unit_divisor=1024,
                        initial=downloaded_size,
                        ascii=True
                ) as progress_bar:
                    try:
                        for data in response.iter_content(chunk_size=1024):
                            size = file.write(data)
                            progress_bar.update(size)
                    except (requests.exceptions.RequestException, IOError) as e:
                        logger.error(f"Download error: {e}")
                        sleep(1)  # Wait for 1 second before retrying
                        logger.error("Retrying...")
                    else:
                        logger.info("Download succeeds.")
                        break  # Download completed successfully

        # Unzip the downloaded file
        logger.info("Unzipping the downloaded file...☕️")
        with zipfile.ZipFile(downloaded_file_path, 'r') as zip_ref:
            zip_ref.extractall(os.path.join(vms_dir, vm_name))
        logger.info("Files have been successfully extracted to the directory: " + str(os.path.join(vms_dir, vm_name)))

    vm_path = os.path.join(vms_dir, vm_name, vm_name, vm_name + ".vmx")

    # Execute the function to download and unzip the VM, and update the vm metadata
    if not os.path.exists(vm_path):
        __download_and_unzip_vm()
        _update_vm(os.path.join(vms_dir, vm_name, original_vm_name, original_vm_name + ".vmx"), vm_name)
    else:
        logger.info(f"Virtual machine exists: {vm_path}")

    # Determine the platform of the host machine and decide the parameter for vmrun
    def get_vmrun_type():
        if platform.system() == 'Windows' or platform.system() == 'Linux':
            return '-T ws'
        elif platform.system() == 'Darwin':  # Darwin is the system name for macOS
            return '-T fusion'
        else:
            raise Exception("Unsupported operating system")

    # Start the virtual machine
    def start_vm(vm_path, max_retries=20):
        command = f'vmrun {get_vmrun_type()} start "{vm_path}" nogui'
        for attempt in range(max_retries):
            result = subprocess.run(command, shell=True, text=True, capture_output=True, encoding="utf-8")
            if result.returncode == 0:
                logger.info("Virtual machine started.")
                return True
            else:
                if "Error" in result.stderr:
                    logger.error(f"Attempt {attempt + 1} failed with specific error: {result.stderr}")
                else:
                    logger.error(f"Attempt {attempt + 1} failed: {result.stderr}")

                if attempt == max_retries - 1:
                    logger.error("Maximum retry attempts reached, failed to start the virtual machine.")
                    return False

    if not start_vm(vm_path):
        raise ValueError("Error encountered during installation, please rerun the code for retrying.")

    def get_vm_ip(vm_path, max_retries=20):
        command = f'vmrun {get_vmrun_type()} getGuestIPAddress "{vm_path}" -wait'
        for attempt in range(max_retries):
            result = subprocess.run(command, shell=True, text=True, capture_output=True, encoding="utf-8")
            if result.returncode == 0:
                return result.stdout.strip()
            else:
                if "Error" in result.stderr:
                    logger.error(f"Attempt {attempt + 1} failed with specific error: {result.stderr}")
                else:
                    logger.error(f"Attempt {attempt + 1} failed: {result.stderr}")

                if attempt == max_retries - 1:
                    logger.error("Maximum retry attempts reached, failed to get the IP of virtual machine.")
                    return None

    vm_ip = get_vm_ip(vm_path)
    if not vm_ip:
        raise ValueError("Error encountered during installation, please rerun the code for retrying.")

    # Function used to check whether the virtual machine is ready
    def download_screenshot(ip):
        url = f"http://{ip}:5000/screenshot"
        try:
            # max trey times 1, max timeout 1
            response = requests.get(url, timeout=(10, 10))
            if response.status_code == 200:
                return True
        except Exception as e:
            logger.error(f"Error: {e}")
            logger.error(f"Type: {type(e).__name__}")
            logger.error(f"Error detail: {str(e)}")
            sleep(2)
        return False

    # Try downloading the screenshot until successful
    while not download_screenshot(vm_ip):
        logger.info("Check whether the virtual machine is ready...")

    logger.info("Virtual machine is ready. Start to make a snapshot on the virtual machine. It would take a while...")

    def create_vm_snapshot(vm_path, max_retries=20):
        command = f'vmrun {get_vmrun_type()} snapshot "{vm_path}" "init_state"'
        for attempt in range(max_retries):
            result = subprocess.run(command, shell=True, text=True, capture_output=True, encoding="utf-8")
            if result.returncode == 0:
                logger.info("Snapshot created.")
                return True
            else:
                if "Error" in result.stderr:
                    logger.error(f"Attempt {attempt + 1} failed with specific error: {result.stderr}")
                else:
                    logger.error(f"Attempt {attempt + 1} failed: {result.stderr}")

                if attempt == max_retries - 1:
                    logger.error("Maximum retry attempts reached, failed to create snapshot.")
                    return False

    # Create a snapshot of the virtual machine
    if create_vm_snapshot(vm_path, max_retries=MAX_RETRY_TIMES):
        return vm_path
    else:
        raise ValueError("Error encountered during installation, please rerun the code for retrying.")


class VMwareVMManager(VMManager):
    def __init__(self, registry_path=REGISTRY_PATH):
        self.registry_path = registry_path
        self.lock = FileLock(".vmware_lck", timeout=10)
        self.initialize_registry()

    def initialize_registry(self):
        with self.lock:  # Locking during initialization
            if not os.path.exists(self.registry_path):
                with open(self.registry_path, 'w') as file:
                    file.write('')

    def add_vm(self, vm_path, region=None):
        assert region in [None, 'local'], "For VMware provider, the region should be neither None or 'local'."
        with self.lock:
            with open(self.registry_path, 'r') as file:
                lines = file.readlines()
                new_lines = lines + [f'{vm_path}|free\n']
            with open(self.registry_path, 'w') as file:
                file.writelines(new_lines)

    def occupy_vm(self, vm_path, pid, region=None):
        assert region in [None, 'local'], "For VMware provider, the region should be neither None or 'local'."
        with self.lock:
            new_lines = []
            with open(self.registry_path, 'r') as file:
                lines = file.readlines()
                for line in lines:
                    registered_vm_path, _ = line.strip().split('|')
                    if registered_vm_path == vm_path:
                        new_lines.append(f'{registered_vm_path}|{pid}\n')
                    else:
                        new_lines.append(line)
            with open(self.registry_path, 'w') as file:
                file.writelines(new_lines)

    def check_and_clean(self, vms_dir):
        with self.lock:  # Lock when cleaning up the registry and vms_dir
            # Check and clean on the running vms, detect the released ones and mark then as 'free'
            active_pids = {p.pid for p in psutil.process_iter()}
            new_lines = []
            vm_paths = []

            with open(self.registry_path, 'r') as file:
                lines = file.readlines()
                for line in lines:
                    vm_path, pid_str = line.strip().split('|')
                    if not os.path.exists(vm_path):
                        logger.info(f"VM {vm_path} not found, releasing it.")
                        new_lines.append(f'{vm_path}|free\n')
                        continue

                    vm_paths.append(vm_path)
                    if pid_str == "free":
                        new_lines.append(line)
                        continue

                    if int(pid_str) in active_pids:
                        new_lines.append(line)
                    else:
                        new_lines.append(f'{vm_path}|free\n')
            with open(self.registry_path, 'w') as file:
                file.writelines(new_lines)

            # Check and clean on the files inside vms_dir, delete the unregistered ones
            os.makedirs(vms_dir, exist_ok=True)
            vm_names = os.listdir(vms_dir)
            for vm_name in vm_names:
                # skip the downloaded .zip file
                if vm_name == DOWNLOADED_FILE_NAME:
                    continue
                # Skip the .DS_Store file on macOS
                if vm_name == ".DS_Store":
                    continue

                flag = True
                for vm_path in vm_paths:
                    if vm_name + ".vmx" in vm_path:
                        flag = False
                if flag:
                    shutil.rmtree(os.path.join(vms_dir, vm_name))

    def list_free_vms(self):
        with self.lock:  # Lock when reading the registry
            free_vms = []
            with open(self.registry_path, 'r') as file:
                lines = file.readlines()
                for line in lines:
                    vm_path, pid_str = line.strip().split('|')
                    if pid_str == "free":
                        free_vms.append((vm_path, pid_str))
            return free_vms

    def get_vm_path(self, region=None):
        assert region in [None,  'local'], "For VMware provider, the region should be neither None or 'local'."
        self.check_and_clean(vms_dir=VMS_DIR)
        free_vms_paths = self.list_free_vms()
        if len(free_vms_paths) == 0:
            # No free virtual machine available, generate a new one
            logger.info("No free virtual machine available. Generating a new one, which would take a while...☕")
            new_vm_name = generate_new_vm_name(vms_dir=VMS_DIR)
            new_vm_path = _install_vm(new_vm_name, vms_dir=VMS_DIR,
                                      downloaded_file_name=DOWNLOADED_FILE_NAME)
            self.add_vm(new_vm_path)
            self.occupy_vm(new_vm_path, os.getpid())
            return new_vm_path
        else:
            # Choose the first free virtual machine
            chosen_vm_path = free_vms_paths[0][0]
            self.occupy_vm(chosen_vm_path, os.getpid())
            return chosen_vm_path