import os
import json
from functools import lru_cache
from flask_babel import gettext as _
from flask_babel import lazy_gettext as _lazy

from markupsafe import escape, Markup

@lru_cache(maxsize=None)
def get_available_locales(only_reviewed=True, sort_by_name=False):
    locales_dir = os.path.join(os.path.dirname(__file__), 'locales')
    dirs = [os.path.join(locales_dir, d) for d in os.listdir(locales_dir)]

    res = [{'code': 'en', 'name': 'English', 'reviewed': True}]

    for d in dirs:
        if d == 'en':
            continue

        meta_file = os.path.join(d, 'meta.json')
        if os.path.isdir(os.path.join(d, 'LC_MESSAGES')) and os.path.isfile(meta_file):
            try:
                with open(meta_file) as f:
                    j = json.loads(f.read())
            except Exception as e:
                print(e)
                continue

            if j.get('reviewed') or not only_reviewed:
                res.append({'code': os.path.basename(d), 'name': j.get('name', ''), 'reviewed': j.get('reviewed', False)})

    if sort_by_name:
        res.sort(key=lambda s: s['name'])

    return res

@lru_cache(maxsize=None)
def get_available_locale_codes(only_reviewed=True):
    return [l['code'] for l in get_available_locales(only_reviewed=only_reviewed)]

@lru_cache(maxsize=None)
def get_alternate_locale_links():
    tmpl = os.environ.get("LT_LOCALE_LINK_TEMPLATE")
    if tmpl is None:
        return []
    
    locales = get_available_locale_codes()
    result = []
    for l in locales:
        link = tmpl.replace("{LANG}", l)
        if l == 'en':
            link = link.replace("en.", "")
        result.append({ 'link': link,'lang': l })
    return result

# Javascript code should use _e instead of _
def gettext_escaped(text, **variables):
    return json.dumps(_(text, **variables))

# HTML should be escaped using _h instead of _
def gettext_html(text, **variables):
    # Translate text without args
    s = str(escape(_(text)))

    v = {}
    if variables:
        for k in variables:
            if hasattr(variables[k], 'unescape'):
                v[k] = variables[k].unescape()
            else:
                v[k] = Markup(variables[k])

    # Variables are assumed to be already escaped and thus safe
    return Markup(s if not v else s % v)

def swag_eval(swag, func):
    # Traverse the swag spec structure
    # and call func on summary and description keys
    for k in swag:
        if k in ['summary', 'description'] and isinstance(swag[k], str) and swag[k] != "":
            swag[k] = func(swag[k])
        elif k == 'tags' and isinstance(swag[k], list):
            swag[k] = [func(v) for v in swag[k]]
        elif isinstance(swag[k], dict):
            swag_eval(swag[k], func)

    return swag

def lazy_swag(swag):
    return swag_eval(swag, _lazy)