import html


def parse_line(line):
    """
    Parse a line of texte to replace HTML specialchars, link, and strong
    / emphased of markdown for HTML
    return: the line ready for HTML
    """
    # Change &, <, > for HTML support
    html.escape(line)

    # Checking if there is strong or emphasized
    while "**" in line:
        line = line.replace("**", "<strong>", 1)
        line = line.replace("**", "</strong>", 1)
    while "*" in line:
        line = line.replace("*", "<em>", 1)
        line = line.replace("*", "</em>", 1)


    # Checking if there is image
    while "![" in line and "]" in line:
        title = line.split("]")[0].split("[")[1]
        link = line.split("]")[1].split("(")[1].split(")")[0]
        line = line.replace(
            "![" + title + "](" + link + ")",
            '<img src="' + link + '" alt="' + title + '"/>',
        )

    # Checking if there is link
    while "[" in line and "]" in line:
        title = line.split("]")[0].split("[")[1]
        link = line.split("]")[1].split("(")[1].split(")")[0]
        line = line.replace(
            "[" + title + "](" + link + ")", '<a href="' + link + '">' + title + "</a>"
        )

    return line


def parse_md(filepath, env_vars):
    """
    Parse a markdown file and return the content to put into the template page
    env_vars: dictionnary of environment variable
    filepath: Filepath of the markdown file
    return: a dictionnary containing title, metadata, local path, content
    """
    content = {
        "content": "",
        "title": "",
        "date": "01-01-0001",
        "description": "",
        "tags": [],
        "filepath": env_vars["pages_path"].replace(env_vars["parent_path"] + "/", "")
        + "/"
        + env_vars["lang"] + "/"
        + filepath.split(".")[0]
        + ".html",
    }

    inmeta, inquote, inpre, inul = False, False, False, False

    # Reading the content of the file and transform into html
    for line in open(env_vars["markdown_path"] + "/" + env_vars["lang"] + "/" + filepath, "r"):
        line = line.strip()

        # Open the metadata
        if line.startswith("---"):
            if inmeta:
                inmeta = False
            else:
                inmeta = True

        # Getting the date metadata
        if inmeta and line.startswith("date:"):
            content["date"] = line.split(":")[1].strip()

        # Getting the description metadata
        if inmeta and line.startswith("description:"):
            content["description"] = line.split(":")[1].strip()

        # Getting the tags metadata
        if inmeta and line.startswith("tags:"):
            tags = line.split(":")[1].split(",")

            # Removing leading and ending white spaces
            for i in range(0, len(tags)):
                tags[i] = tags[i].strip()
            content["tags"] = tags

        # Close quote if not quoting
        if inquote and not line.startswith(">"):
            content["content"] += "</blockquote>\n"
            inquote = False

        # Close list if not listing
        if inul and not line.startswith("-"):
            content["content"] += "</li>\n</ul>\n"
            inul = False

        # Checking if it's a code block
        if line.startswith("```"):
            if inpre:
                content["content"] += "</code></pre>\n"

            content["content"] += "<pre><code>" + line.lstrip("```")
            inpre = True

        # Checking if it's a quote
        elif line.startswith(">"):
            if inquote:
                content["content"] += parse_line(line.lstrip("> "))
            else:
                content["content"] += "<blockquote>" + parse_line(line.lstrip("> "))
                inquote = True

        # Checking if it's a list
        elif line.startswith("-") and not line.startswith("---"):
            if inul:
                content["content"] += "</li>\n"
                content["content"] += "\t<li>" + parse_line(line.lstrip("- "))
            else:
                content["content"] += "<ul>\n\t<li>" + parse_line(line.lstrip("- "))
                inul = True

        # Checking if it's a title
        elif line.startswith("###"):
            content["content"] += "<h3>" + parse_line(line.lstrip("# ")) + "</h3>\n"
        elif line.startswith("##"):
            content["content"] += "<h2>" + parse_line(line.lstrip("# ")) + "</h2>\n"
        elif line.startswith("#"):
            content["title"] += parse_line(line.lstrip("# "))

        # else it's a paragraph
        elif line != " " and line != "" and not inmeta and not line.startswith("---"):
            content["content"] += "<p>" + parse_line(line) + "</p>\n"

    # Checking all balise are closed
    if inquote:
        content["content"] += "</blockquote>\n"
        inquote = False

    if inul:
        content["content"] += "</li>\n</ul>\n"
        inul = False

    if inpre:
        content["content"] += "</code></pre>\n"
        inpre = False

    return content