import requests

import help_methods

supported_templates = sorted(
    list(
        map(
            lambda x: x["id"],
            requests.get("https://api.memegen.link/templates/").json(),
        )
    )
)


def parse_message(template, top, bottom):
    escaped_chars = {
        "_": "__",
        " ": "_",
        "-": "--",
        "?": "~q",
        "%": "~p",
        "#": "~h",
        "/": "~s",
        "''": '"',
    }

    # Escape special characters in top/bottom text
    for char, escaped in escaped_chars.items():
        top = top.replace(char, escaped)
        bottom = bottom.replace(char, escaped)

    usesTemplate = True
    if template.startswith("http"):
        usesTemplate = False
    elif template not in supported_templates:
        return "Template not supported!"

    return get_meme_url(template, top, bottom, usesTemplate)


def get_meme_url(template, top, bottom, usesTemplate):
    # TODO: Implement format as a parameter?
    base_URL = "https://memegen.link"
    custom_URL = "{}/custom".format(base_URL)
    default_format = "jpg"

    # Generate meme url
    meme = "{}/{}/{}.{}?alt={}".format(
        custom_URL, top, bottom, default_format, template
    )
    if usesTemplate:
        meme = "{}/{}/{}/{}.{}".format(base_URL, template, top, bottom, default_format)
    return meme


def get_meme_help():
    return "{}\nYou must supply a valid template for the meme. Templates are one of the following: \n```{}```".format(
        help_methods.get_help_message("meme"), ", ".join(supported_templates)
    )