"""create messages table

Revision ID: b2c3d4e5f6g7
Revises: a1b2c3d4e5f6
Create Date: 2023-01-01 13:00:00.000000
"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.sql import func
import uuid

# revision identifiers
revision = 'b2c3d4e5f6g7'
down_revision = 'a1b2c3d4e5f6'
branch_labels = None
depends_on = None

def upgrade():
    op.create_table(
        'messages',
        sa.Column('id', sa.String(), primary_key=True, default=lambda: str(uuid.uuid4())),
        sa.Column('sender_id', sa.String(), sa.ForeignKey('users.id', ondelete='CASCADE')),
        sa.Column('receiver_id', sa.String(), sa.ForeignKey('users.id', ondelete='CASCADE')),
        sa.Column('content', sa.Text(), nullable=False),
        sa.Column('is_read', sa.Boolean(), default=False),
        sa.Column('created_at', sa.DateTime(), server_default=sa.func.now()),
        sa.Column('updated_at', sa.DateTime(), server_default=sa.func.now(), onupdate=sa.func.now()),
        sa.PrimaryKeyConstraint('id')
    )
    
    op.create_index('ix_messages_sender_id', 'messages', ['sender_id'])
    op.create_index('ix_messages_receiver_id', 'messages', ['receiver_id'])
    op.create_index('ix_messages_created_at', 'messages', ['created_at'])

def downgrade():
    op.drop_index('ix_messages_created_at', 'messages')
    op.drop_index('ix_messages_receiver_id', 'messages')
    op.drop_index('ix_messages_sender_id', 'messages')
    op.drop_table('messages')