import collections
import contextlib
import datetime
import multiprocessing
import os
import shutil
import sys
import socket
import tempfile
import threading

import jinja2
import yaml


@contextlib.contextmanager
def temp_dir():
    path = tempfile.mkdtemp(dir=os.environ.get("TEMP"))
    try:
        yield path
    finally:
        shutil.rmtree(path)


@contextlib.contextmanager
def cd(new_cwd):
    old_cwd = os.getcwd()
    os.chdir(new_cwd)
    try:
        yield
    finally:
        os.chdir(old_cwd)


def get_free_port():
    with contextlib.closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
        s.bind(("", 0))
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        return s.getsockname()[1]


def run_function_in_parallel(func, args_list, threads=False):
    processes = []
    exit_code = 0
    for task in args_list:
        cls = threading.Thread if threads else multiprocessing.Process
        processes.append(cls(target=func, args=task))
        processes[-1].start()
    for process in processes:
        process.join()
        if not threads:
            if process.exitcode and not exit_code:
                exit_code = process.exitcode
    if exit_code:
        sys.exit(exit_code)


def read_md_file(path):
    in_meta = False
    meta = {}
    meta_text = []
    content = []
    if os.path.exists(path):
        with open(path, "r") as f:
            for line in f:
                if line.startswith("---"):
                    if in_meta:
                        in_meta = False
                        meta = yaml.full_load("".join(meta_text))
                    else:
                        in_meta = True
                else:
                    if in_meta:
                        meta_text.append(line)
                    else:
                        content.append(line)
    return meta, "".join(content)


def write_md_file(path, meta, content):
    dirname = os.path.dirname(path)
    if not os.path.exists(dirname):
        os.makedirs(dirname)

    with open(path, "w") as f:
        if meta:
            print("---", file=f)
            yaml.dump(meta, f)
            print("---", file=f)
            if not content.startswith("\n"):
                print("", file=f)
        f.write(content)


def represent_ordereddict(dumper, data):
    value = []
    for item_key, item_value in data.items():
        node_key = dumper.represent_data(item_key)
        node_value = dumper.represent_data(item_value)

        value.append((node_key, node_value))

    return yaml.nodes.MappingNode("tag:yaml.org,2002:map", value)


yaml.add_representer(collections.OrderedDict, represent_ordereddict)


def init_jinja2_filters(env):
    import amp
    import website

    chunk_size = 10240
    env.filters["chunks"] = lambda line: [
        line[i : i + chunk_size] for i in range(0, len(line), chunk_size)
    ]
    env.filters["html_to_amp"] = amp.html_to_amp
    env.filters["adjust_markdown_html"] = website.adjust_markdown_html
    env.filters["to_rfc882"] = lambda d: datetime.datetime.strptime(
        d, "%Y-%m-%d"
    ).strftime("%a, %d %b %Y %H:%M:%S GMT")


def init_jinja2_env(args):
    import mdx_clickhouse

    env = jinja2.Environment(
        loader=jinja2.FileSystemLoader(
            [args.website_dir, os.path.join(args.docs_dir, "_includes")]
        ),
        extensions=["jinja2.ext.i18n", "jinja2_highlight.HighlightExtension"],
    )
    env.extend(jinja2_highlight_cssclass="syntax p-3 my-3")
    translations_dir = os.path.join(args.website_dir, "locale")
    env.install_gettext_translations(
        mdx_clickhouse.get_translations(translations_dir, "en"), newstyle=True
    )
    init_jinja2_filters(env)
    return env