import io
from fabric import Connection
from getpass import getpass
from dotenv import load_dotenv
import io # Make sure io is imported at the top of your script
import os
from cube_activate_ssh import activate_ssh

def execute_command(c, command):
    """Executes a simple command on the remote device."""
     # print(f"--- [{c.host}] Executing: {command} ---")
    try:
        result = c.run(command, hide=True)
        return result.stdout
        # print("STDOUT:")
        # print(result.stdout)
        # print("STDERR:")
        # print(result.stderr)
    except Exception as e:
        print(f"Error executing {command}: {e}")

def execute_sudo_command(c, command, sudo_pass):
    """Executes a command with sudo on the remote device."""
    # print(f"\n--- [{c.host}] Executing with sudo: {command} ---")
    try:
        result = c.sudo(command, password=sudo_pass, pty=True, hide=True)
        return result.stdout
        # print("STDOUT:")
        # print(result.stdout)
        # print("STDERR:")
        # print(result.stderr)
    except Exception as e:
        print(f"Error executing {command} as administrator: {e}")

def read_remote_config_sudo(c, remote_path, sudo_pass):
    """
    Reads a remote file with sudo and returns its content as a string.
    """
    # print(f"\n--- [{c.host}] Reading remote file with sudo: {remote_path} ---")
    try:
        # Use sudo to cat the file and capture its output
        result = c.sudo(f"cat {remote_path}", password=sudo_pass, hide=True)
        return result.stdout
    except Exception as e:
        print(f"Error reading remote file with sudo: {e}")
        return None

import shlex # Make sure to import shlex at the top of your script

def write_remote_config_sudo(c, remote_path, content, sudo_pass, user_owner, group_owner, permissions):
    """
    Writes content directly to a remote file using the 'sudo sh -c' pattern.

    This is the most robust and secure method for environments where SFTP is
    disabled. It avoids input stream conflicts and prevents shell injection.

    Args:
        c (fabric.Connection): The active connection object.
        remote_path (str): The absolute path to the file on the remote host.
        content (str): The string content to be written to the file.
        sudo_pass (str): The sudo password for the write operation.
    """
    print(f"\n--- [{c.host}] Writing directly using 'sudo sh -c' method: {remote_path} ---")
    try:
        # Step 1: Securely escape the content for safe shell execution.
        # shlex.quote() wraps the string in single quotes and handles any
        # internal single quotes, making it safe to pass to a shell.
        safe_content = shlex.quote(content)

        # Step 2: Construct the command.
        # 'sudo sh -c "..."': This runs a new shell ('sh') with root privileges.
        # 'echo ... > file': This command is executed *by the root shell*.
        # The redirection '>' is therefore handled by root, which has permission
        # to write to the protected 'remote_path'.
        command = f"sh -c \"echo {safe_content} > {remote_path}\""

        print("Step 1: Writing content via root shell...")
        # We run this entire command string using c.sudo(). Fabric will handle
        # the password prompt correctly for the 'sudo sh' part.
        c.sudo(command, password=sudo_pass, hide=True)

        # Step 3: Set ownership and permissions as a separate step.
        print("Step 2: Setting ownership and permissions...")
        c.sudo(f"chown {user_owner}:{group_owner} {remote_path}", password=sudo_pass)
        c.sudo(f"chmod {permissions} {remote_path}", password=sudo_pass)

        print(f"✅ Successfully wrote content to {remote_path}")

    except Exception as e:
        print(f"❌ Error writing directly to remote file: {e}")
        # Re-raise the exception so the calling function can handle it.
        raise

def set_config_field(config_content, option, new_value, add_if_missing=False):
    """
    Replaces a configuration value, or optionally adds it if it's missing.

    This function is idempotent: running it multiple times with the same
    parameters will result in the same configuration state.

    Args:
        config_content (str): The multi-line string of the configuration file.
        option (str): The configuration key to find (e.g., "PermitRootLogin").
        new_value (str): The new value to set for the option.
        add_if_missing (bool): If True, adds the 'option=new_value' to the end
                               of the content if it's not found. Defaults to False.

    Returns:
        str: The modified configuration content.
    """
    lines = config_content.splitlines()
    new_lines = []
    found = False

    # First, iterate through the existing lines to find and replace the option.
    for line in lines:
        # Check if the line is a non-commented definition of our option.
        if line.strip().startswith(option + '=') and not line.strip().startswith('#'):
            new_lines.append(f"{option}={new_value}")
            found = True
        else:
            # Keep the original line if it's not a match.
            new_lines.append(line)

    # After checking all lines, if the option was not found AND we are
    # instructed to add it, we append it to the end of the configuration.
    if not found and add_if_missing:
        print(f"Info: Option '{option}' not found. Appending it to the configuration.")
        # Ensure the new line is actually on a new line.
        if new_lines and new_lines[-1] != '':
             new_lines.append('') # Add a blank line for separation if needed
        new_lines.append(f"{option}={new_value}")
    elif not found:
        # This is the original behavior: do nothing if missing and not told to add.
        print(f"Warning: Option '{option}' not found. No changes made.")

    return "\n".join(new_lines)

def find_config_value(config_content, option):
    """
    Finds a specific option in a configuration string and returns its value.

    Args:
        config_content (str): The multi-line string of the configuration file.
        option (str): The configuration key to find (e.g., "PermitRootLogin").

    Returns:
        str: The value of the option if found.
        None: If the option is not found or is commented out.
    """
    try:
        # Go through each line in the configuration
        for line in config_content.splitlines():
            # Clean up the line by removing leading/trailing whitespace
            clean_line = line.strip()

            # Check if the line is not a comment and starts with our option
            # The '=' is important to avoid matching partial keys (e.g., 'Port' matching 'Ports')
            if not clean_line.startswith('#') and clean_line.startswith(option + '='):
                
                # Split the line only on the first equals sign
                # This handles cases where the value itself might contain an '='
                parts = clean_line.split('=', 1)
                
                # The value is the second part, stripped of any whitespace
                value = parts[1].strip()
                return value
                
    except Exception as e:
        # In case of any unexpected error (e.g., malformed content), return None
        print(f"An error occurred while parsing config: {e}")
        return None

    # If the loop finishes without finding the option, return None
    return None

def cloud_configuration_check(hostname, result, iot_hub, proxy_host, proxy_port):
    print(f"\tLight telemetry:", end=" ", flush=True)
    status = find_config_value(result, "light-telemetry")
    if status == "false":
        print(f"✅", end="\n", flush=True)
    else:
        print(f"❌")

    print(f"\tTelemetry:", end=" ", flush=True)
    status = find_config_value(result, "telemetry-on")
    if status == "true":
        print(f"✅", end="\n", flush=True)
    else:
        print(f"❌")


    print(f"\tCompression:", end=" ", flush=True)
    status = find_config_value(result, "compression-enabled")
    if status == "true":
        print(f"✅", end="\n", flush=True)
    else:
        print(f"❌", end="\n", flush=True)

    print(f"\tRemote update:", end=" ", flush=True)
    status = find_config_value(result, "remote-update-on")
    if status == "true":
        print(f"✅", end="\n", flush=True)
    else:
        print(f"❌", end="\n", flush=True)

    print(f"\tConnection string:", end="\n", flush=True)
    status = find_config_value(result, "connection-string")
    parsed_data = parse_connection_string(status)
    print(f"\t\tIoT Hub:", end=" ", flush=True)
    print(f"{parsed_data.get('HostName')}", end=" ", flush=True)
    if parsed_data.get('HostName').strip() == iot_hub.strip():
            print(f"✅", end="\n", flush=True)
    else:
        print(f"❌", end="\n", flush=True)
    print(f"\t\tDevice ID:", end=" ", flush=True)
    print(f"{parsed_data.get('DeviceId')}", end=" ", flush=True)
    if parsed_data.get('DeviceId').strip() == hostname.strip():
            print(f"✅", end="\n", flush=True)
    else:
        print(f"❌", end="\n", flush=True)  

    print(f"\tProxy:", end="\n", flush=True)
    print(f"\t\tHost:", end=" ", flush=True)
    status = find_config_value(result, "proxy-host")
    if status == None:
        print(f"NA ❌", end="\n", flush=True)
    elif status == proxy_host:
        print(f"✅", end="\n", flush=True)
    else:
        print(f"❌", end="\n", flush=True)
    print(f"\t\tPort:", end=" ", flush=True)
    status = find_config_value(result, "proxy-port")
    if status == None:
        print(f"NA ❌", end="\n", flush=True)
    elif status == proxy_port:
        print(f"✅", end="\n", flush=True)
    else:
        print(f"❌", end="\n", flush=True)

def parse_connection_string(connection_string):
    """
    Parses a semicolon-separated connection string into a dictionary,
    handling keys that have an escaped equals sign (e.g., 'Key\\=Value').
    """
    parsed_data = {}
    
    # 1. Split the entire string by the semicolon to get each pair
    parts = connection_string.split(';')
    
    for part in parts:
        # 2. IMPORTANT: Replace the escaped separator '\\=' with a plain '='.
        # This is the only replacement needed and uses the correct syntax.
        cleaned_part = part.replace('\\=', '=')

        # 3. Now, split the cleaned part by the first equals sign
        if '=' in cleaned_part:
            key, value = cleaned_part.split('=', 1)
            # Add the key-value pair to our dictionary, stripping any extra whitespace
            parsed_data[key.strip()] = value.strip()
            
    return parsed_data

def main():
    """Main function to parse arguments and orchestrate tasks."""
    ip_address_prefix = "10.81.35." # Carling subnet
    ip_address_range = [] # list(range(65, 75)) # From 65 to 74
    ip_address_range.append(66) #(85) # Add 85 after 74.
    hosts = [f"{ip_address_prefix}{suffix}" for suffix in ip_address_range]

    ssh_port = 11022
    ssh_user = os.getenv("DEFAULT_CUBE_LINUX_ADMIN_USER")
    ssh_password = os.getenv("DEFAULT_CUBE_LINUX_ADMIN_PASSWORD")

    connect_args = {}
    connect_args["password"] = ssh_password
    connect_args["banner_timeout"] = 3
    connect_args["auth_timeout"] = 60
    connect_args["channel_timeout"] = 60


    for host in hosts:
        print(f"{host}", end=" - ", flush=True)

        hostname = ""
        result = ""

        try:
            activate_ssh(host)
        except Exception as e:
            print(f"Exception: {e}")
            continue
       
        with Connection(host=host, user=ssh_user, port=ssh_port, connect_timeout=60, connect_kwargs=connect_args) as c:
            try:
                print(f"Hostname:", end=" ", flush=True)
                result = execute_command(c, "hostname")
                print(f"{result.strip()}", end="\n", flush=True)
                hostname = str.lower(result)
            except Exception as e:
                print(f"[Hostname] Exception: {e}")
                continue

            try:
                print(f"Checking Cloud configuration:", end=" ", flush=True)
                result = read_remote_config_sudo(c, "/etc/cube/config-azure.properties", ssh_password)
                print(f"✅", end="\n", flush=True)
            except:
                print(f"❌", end="\n", flush=True)
                print(f"[Cloud configuration check] Exception: {e}")
                continue

            cloud_configuration_check(hostname, result, "iot-ingest-ess-prod.azure-devices.net", "10.81.35.126", "8080")

            print(f"Setting proxy configuration:", end="\n", flush=True)
            result_proxy_host = set_config_field(result, "proxy-host", "10.81.35.126", True)
            result_proxy_host_port = set_config_field(result_proxy_host, "proxy-port", "8080", True)
            result = result_proxy_host_port
            cloud_configuration_check(hostname, result, "iot-ingest-ess-prod.azure-devices.net", "10.81.35.126", "8080")

            response = input(f"Apply the change on {hostname.strip()}? (y)es to apply, anything else to cancel - ").lower()
            if response in ['y']:
                print(f"Applying changes:", end=" ", flush=True)
                try:
                    write_remote_config_sudo(c,  "/etc/cube/config-azure.properties", result, ssh_password, "cube", "root", "644")
                    print(f"✅", end="\n", flush=True)
                except Exception as e:
                    print(f"❌", end="\n", flush=True)
                    print(f"[Proxy configuration] Exception: {e}")
                    continue
                print(f"Checking Cloud configuration:", end=" ", flush=True)
                try:
                    result = read_remote_config_sudo(c, "/etc/cube/config-azure.properties", ssh_password)
                    print(f"✅", end="\n", flush=True)
                except:
                    print(f"❌", end="\n", flush=True)
                    print(f"[Proxy verification] Exception: {e}")
                    continue

                cloud_configuration_check(hostname, result, "iot-ingest-ess-prod.azure-devices.net", "10.81.35.126", "8080")
            else:
                print(f"Not applying configuration...")
                continue

if __name__ == "__main__":
    main()