"""add calendar tables

Revision ID: 56359461a091
Revises: c1d2e3f4a5b6
Create Date: 2026-04-19 16:20:58.162045

"""

from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

# revision identifiers, used by Alembic.
revision: str = '56359461a091'
down_revision: Union[str, None] = 'c1d2e3f4a5b6'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def _index_exists(inspector, index_name, table_name):
    """Check if an index already exists on the given table."""
    indexes = inspector.get_indexes(table_name)
    return any(idx['name'] == index_name for idx in indexes)


def upgrade() -> None:
    conn = op.get_bind()
    inspector = sa.inspect(conn)
    tables = inspector.get_table_names()

    if 'calendar' not in tables:
        op.create_table(
            'calendar',
            sa.Column('id', sa.Text(), nullable=False),
            sa.Column('user_id', sa.Text(), nullable=False),
            sa.Column('name', sa.Text(), nullable=False),
            sa.Column('color', sa.Text(), nullable=True),
            sa.Column('is_default', sa.Boolean(), nullable=False),
            sa.Column('data', sa.JSON(), nullable=True),
            sa.Column('meta', sa.JSON(), nullable=True),
            sa.Column('created_at', sa.BigInteger(), nullable=False),
            sa.Column('updated_at', sa.BigInteger(), nullable=False),
            sa.PrimaryKeyConstraint('id'),
        )

    inspector.clear_cache()
    if 'calendar' in inspector.get_table_names():
        if not _index_exists(inspector, 'ix_calendar_user', 'calendar'):
            op.create_index('ix_calendar_user', 'calendar', ['user_id'], unique=False)

    if 'calendar_event' not in tables:
        op.create_table(
            'calendar_event',
            sa.Column('id', sa.Text(), nullable=False),
            sa.Column('calendar_id', sa.Text(), nullable=False),
            sa.Column('user_id', sa.Text(), nullable=False),
            sa.Column('title', sa.Text(), nullable=False),
            sa.Column('description', sa.Text(), nullable=True),
            sa.Column('start_at', sa.BigInteger(), nullable=False),
            sa.Column('end_at', sa.BigInteger(), nullable=True),
            sa.Column('all_day', sa.Boolean(), nullable=False),
            sa.Column('rrule', sa.Text(), nullable=True),
            sa.Column('color', sa.Text(), nullable=True),
            sa.Column('location', sa.Text(), nullable=True),
            sa.Column('data', sa.JSON(), nullable=True),
            sa.Column('meta', sa.JSON(), nullable=True),
            sa.Column('is_cancelled', sa.Boolean(), nullable=False),
            sa.Column('created_at', sa.BigInteger(), nullable=False),
            sa.Column('updated_at', sa.BigInteger(), nullable=False),
            sa.PrimaryKeyConstraint('id'),
        )

    inspector.clear_cache()
    if 'calendar_event' in inspector.get_table_names():
        if not _index_exists(inspector, 'ix_calendar_event_calendar', 'calendar_event'):
            op.create_index('ix_calendar_event_calendar', 'calendar_event', ['calendar_id', 'start_at'], unique=False)
        if not _index_exists(inspector, 'ix_calendar_event_user_date', 'calendar_event'):
            op.create_index('ix_calendar_event_user_date', 'calendar_event', ['user_id', 'start_at'], unique=False)

    if 'calendar_event_attendee' not in tables:
        op.create_table(
            'calendar_event_attendee',
            sa.Column('id', sa.Text(), nullable=False),
            sa.Column('event_id', sa.Text(), nullable=False),
            sa.Column('user_id', sa.Text(), nullable=False),
            sa.Column('status', sa.Text(), nullable=False),
            sa.Column('meta', sa.JSON(), nullable=True),
            sa.Column('created_at', sa.BigInteger(), nullable=False),
            sa.Column('updated_at', sa.BigInteger(), nullable=False),
            sa.PrimaryKeyConstraint('id'),
            sa.UniqueConstraint('event_id', 'user_id', name='uq_event_attendee'),
        )

    inspector.clear_cache()
    if 'calendar_event_attendee' in inspector.get_table_names():
        if not _index_exists(inspector, 'ix_calendar_event_attendee_user', 'calendar_event_attendee'):
            op.create_index(
                'ix_calendar_event_attendee_user', 'calendar_event_attendee', ['user_id', 'status'], unique=False
            )


def downgrade() -> None:
    op.drop_index('ix_calendar_event_attendee_user', table_name='calendar_event_attendee')
    op.drop_table('calendar_event_attendee')
    op.drop_index('ix_calendar_event_user_date', table_name='calendar_event')
    op.drop_index('ix_calendar_event_calendar', table_name='calendar_event')
    op.drop_table('calendar_event')
    op.drop_index('ix_calendar_user', table_name='calendar')
    op.drop_table('calendar')