import os

import magic
from PIL import Image
from distribusi.templates.page_template import html_footer, html_head
from distribusi.templates.image_templates import (
    image_no_description,
    image_with_description,
    image_with_alttext,
    image_full_figure,
)
from distribusi.mappings import CODE_TYPES, FILE_TYPES, SUB_TYPES

MIME_TYPE = magic.Magic(mime=True)


def _add_alttext(full_path_image):
    try:
        image_filename_no_ext = os.path.splitext(full_path_image)[0]
        alttext_filename = f"{image_filename_no_ext}_alttext.txt"
        return _read_matching_text_file(
            image_filename_no_ext, alttext_filename
        )
    except Exception as e:
        print(f"exception {e} raised while making alttext")
        return


def _add_description(full_path_image):
    try:
        image_filename_no_ext = os.path.splitext(full_path_image)[0]
        description_filename = f"{image_filename_no_ext}_dv_description.txt"
        return _read_matching_text_file(
            image_filename_no_ext, description_filename
        )
    except Exception as e:
        print(f"exception {e} raised while adding description")
        return


def _read_matching_text_file(image_filename_no_ext, filename):
    if not os.path.isfile(filename):
        return
    print(f"{image_filename_no_ext} has {filename}")
    with open(filename, "r") as text_file:
        return text_file.read()


def _make_thumbnail(full_path_image, name):
    if full_path_image.endswith("_thumbnail.jpg"):
        return
    try:
        size = (450, 450)
        thumbnail_image = Image.open(full_path_image)
        thumbnail_image.thumbnail(size)

        if thumbnail_image.mode == "RGBA":
            bg = Image.new("RGBA", thumbnail_image.size, (255, 255, 255))
            composite = Image.alpha_composite(bg, thumbnail_image)
            thumbnail_image = composite.convert("RGB")

        image_filename_no_ext = os.path.splitext(full_path_image)[0]
        thumbnail_filename = f"{image_filename_no_ext}_thumbnail.jpg"
        thumbnail_image.save(thumbnail_filename, format="JPEG")
        return os.path.basename(thumbnail_filename)
    except Exception as e:
        print("Thumbnailer:", e)
        return


def _format_div(type_, subtype, tag, name):
    id_name = name.split(".")[0].replace(" ", "_")
    filename = f'<span class="filename">{name}</span>'

    if "image" in type_:
        html = '<div id="{}" class="{}">{}</div>'
    elif "pdf" in subtype:
        html = '<div id="{}" class="{}">{}' + filename + "</div>"
    elif "dir" in type_ or "html" in subtype or "unkown-file" in subtype:
        html = '<div id="{}" class="{}">{}</div>'
    else:
        html = '<div id="{}" class="{}">{}' + filename + "</div>"

    return html.format(id_name, subtype, tag)


def _check_distribusi_index(index):
    """
    check whether a index.html file is generated by distribusi
    """
    with open(index, "r") as f:
        if '<meta name="generator" content="distribusi" />' in f.read():
            return True
        return False


def _write_index_html(index, html, cssfile):
    with open(index, "w") as index_file:
        styled_html_head = html_head.format(cssfile=cssfile)
        index_file.write(styled_html_head)
        for line in html:
            index_file.write(line + "\n")
        index_file.write(html_footer)


def _handle_text_files(name, full_path, subtype):
    if name.endswith(".html") or subtype == "html":
        subtype = "html"
        # what types of text files to expand
        tag = '<section id="{}">{}</section>'.format(
            name, open(full_path).read()
        )
    elif subtype in CODE_TYPES or name.endswith(".txt"):
        # if the plain text is code,
        # which types do we wrap in pre-tags?
        tag = "<pre>" + open(full_path).read() + "</pre>"
    else:
        subtype = subtype + " unkown-file"
        tag = "<a href='{}'>{}</a>"
        # a = FILE_TYPES[type_]
    return subtype, tag


def _handle_image_files(name, full_path):
    thumbnail_filename = _make_thumbnail(full_path, name)
    if thumbnail_filename is None:
        return

    image_alttext = _add_alttext(full_path)
    image_description = _add_description(full_path)

    if not image_alttext and not image_description:
        return image_no_description.format(
            name=name, thumbnail_filename=thumbnail_filename
        )
    if not image_alttext:
        return image_with_description.format(
            name=name,
            thumbnail_filename=thumbnail_filename,
            image_description=image_description,
        )
    if not image_description:
        return image_with_alttext.format(
            name=name,
            thumbnail_filename=thumbnail_filename,
            image_alttext=image_alttext,
        )
    return image_full_figure.format(
        name=name,
        thumbnail_filename=thumbnail_filename,
        image_alttext=image_alttext,
        image_description=image_description,
    )


def _remove_existing_index_html(root, files):
    index = os.path.join(root, "index.html")
    if "index.html" in files:
        try:
            if check_distribusi_index(index):
                os.remove(index)
        except Exception as e:
            print(e)
    return


def _remove_hidden_files_and_folders(dirs, files):
    dirs = list(filter(lambda d: not d.startswith("."), dirs))
    files = list(filter(lambda f: not f.startswith("."), files))
    return dirs, files


def _is_skippable_file(name, cssfile):
    if "index.html" in name:
        return True

    if name.endswith("_thumbnail.jpg"):
        return True

    if name.endswith("_alttext.txt"):
        return True

    if name.endswith("_dv_description.txt"):
        return True

    if cssfile in name:
        return True


def distribusify(directory, cssfile):
    for root, dirs, files in os.walk(directory):
        html = []
        dirs, files = _remove_hidden_files_and_folders(dirs, files)
        _remove_existing_index_html(root, files)

        for name in sorted(files):
            if _is_skippable_file(name, cssfile):
                continue

            full_path = os.path.join(root, name)
            mime = MIME_TYPE.from_file(full_path)
            type_, subtype = mime.split("/")
            alttext = name

            if type_ in FILE_TYPES:
                match type_:
                    case "text":
                        subtype, tag = handle_text_files(
                            name, full_path, subtype
                        )
                    case "image":
                        tag = _handle_image_files(name, full_path)
                        if tag is None:
                            continue
                    case _:
                        tag = FILE_TYPES[type_].format(name, alttext)

            if subtype in SUB_TYPES:
                tag = SUB_TYPES[subtype]

            if type_ not in FILE_TYPES and subtype not in SUB_TYPES:
                # catch exceptions not yet defined in FILE_TYPES or SUB_TYPES
                tag = "<a href='{}'>{}</a>"

            tag = tag.replace("{}", name)
            html.append(_format_div(type_, subtype, tag, name))

        if root != directory:
            html.append('<a href="../index.html">../</a>')

        for name in sorted(dirs):
            tag = "<a href='{}/index.html'>{}</a>".replace("{}", name)
            html.insert(0, format_div("dir", "dir", tag, "folder"))

        index = os.path.join(root, "index.html")
        _write_index_html(index, html, cssfile)