"""
Shared Jinja2 templates configuration.

All routers should import `templates` from this module to get consistent
filter and global function registration.
"""

from fastapi.templating import Jinja2Templates

# Import timezone utilities
from backend.utils.timezone import (
    format_local_datetime, format_local_time,
    get_user_timezone, get_timezone_abbreviation
)


def jinja_local_datetime(dt, fmt="%Y-%m-%d %H:%M"):
    """Jinja filter to convert UTC datetime to local timezone."""
    return format_local_datetime(dt, fmt)


def jinja_local_time(dt):
    """Jinja filter to format time in local timezone."""
    return format_local_time(dt)


def jinja_timezone_abbr():
    """Jinja global to get current timezone abbreviation."""
    return get_timezone_abbreviation()


# Create templates instance
templates = Jinja2Templates(directory="templates")

# Register Jinja filters and globals
templates.env.filters["local_datetime"] = jinja_local_datetime
templates.env.filters["local_time"] = jinja_local_time
templates.env.globals["timezone_abbr"] = jinja_timezone_abbr
templates.env.globals["get_user_timezone"] = get_user_timezone