import re
import logging
from pathlib import Path
from django.http import HttpResponse
from django.conf import settings

logger = logging.getLogger(__name__)

TEMPLATE_DIR = Path(settings.BASE_DIR) / "TempLate"


def openr(filepath):
    try:
        with open(filepath, 'r', encoding='utf-8') as f:
            return f.read()
    except FileNotFoundError:
        logger.warning(f"Template file not found: {filepath}")
        return ''
    except Exception as e:
        logger.error(f"Error reading template file {filepath}: {e}")
        return ''


def _resolve_url_for(endpoint):
    endpoint_map = {
        'UGM.UGM_Query_GetELTUserAvatar': '/Query/GetELTUserAvatar',
        'MainLoginHTML': 'https://ugm.gvsds.com/login',
        'GERP.GERPIndex': 'https://gerp.gvsds.com/',
        'UGM.Index': 'https://ugm.gvsds.com/',
    }
    if endpoint in endpoint_map:
        return endpoint_map[endpoint]
    parts = endpoint.split('.')
    if len(parts) >= 2:
        return '/' + '/'.join(parts[1:])
    return '/'


def ProcessTemplate(html_file, **kwargs):
    html_path = TEMPLATE_DIR / html_file
    html = openr(html_path)

    base_path = TEMPLATE_DIR / "_Base"
    footer_path = TEMPLATE_DIR / "_Footer"

    use_base = kwargs.pop('UseBase', 'true')
    no_footer = kwargs.pop('NoFooter', '')
    sub_base = kwargs.pop('SubBase', None)

    if sub_base:
        sub_base_path = TEMPLATE_DIR / sub_base
        _sub_base = openr(sub_base_path)
        if _sub_base:
            h = _sub_base.replace("{{ MAIN }}", html)
        else:
            h = html
    elif use_base.lower() != 'false':
        _base = openr(base_path)
        _footer = openr(footer_path)
        if _base:
            h = _base.replace("{{ MAIN }}", html)
            if no_footer:
                h = h.replace("{{ Footer }}", "")
            else:
                h = h.replace("{{ Footer }}", _footer if _footer else "")
        else:
            h = html
    else:
        h = html

    h = re.sub(r'\{\{\s*url_for\([\'"]([^\'"]+)[\'"]\)\s*\}\}', lambda m: _resolve_url_for(m.group(1)), h)

    for key, value in kwargs.items():
        h = h.replace("{{ %s }}" % key, str(value))

    return h


def render_template(request, template_name, **kwargs):
    kwargs.setdefault('UseBase', 'false')
    content = ProcessTemplate(template_name, **kwargs)
    return HttpResponse(content, content_type='text/html; charset=utf-8')