import base64
import os
import sys

from mako.template import Template

from . import messages
from .config import agent_templates_folder_path
from .config import obfuscators_templates_folder_path
from .weexceptions import FatalException


def generate(password, obfuscator="phar", agent="obfpost_php"):
    obfuscator_path = os.path.join(obfuscators_templates_folder_path, obfuscator + ".tpl")
    agent_path = os.path.join(agent_templates_folder_path, agent + ".tpl")

    for path in (obfuscator_path, agent_path):
        if not os.path.isfile(path):
            raise FatalException(messages.generic.file_s_not_found % path)

    obfuscator_template = Template(filename=obfuscator_path)

    try:
        with open(agent_path) as templatefile:
            agent = Template(templatefile.read()).render(password=password).encode("utf-8")

    except Exception as e:
        raise FatalException(messages.generate.error_agent_template_s_s % (agent_path, str(e)))

    try:
        obfuscated = obfuscator_template.render(agent=agent)
    except Exception as e:
        raise FatalException(messages.generate.error_obfuscator_template_s_s % (obfuscator_path, str(e)))

    return obfuscated


def save_generated(obfuscated, output):
    b64 = obfuscated[:4] == "b64:"
    final = base64.b64decode(obfuscated[4:]) if b64 else obfuscated.encode("utf-8")
    try:
        if output == "-":
            sys.stdout.buffer.write(final)
        else:
            with open(output, "wb") as outfile:
                outfile.write(final)
    except Exception as e:
        raise FatalException(messages.generic.error_creating_file_s_s % (output, e))