"""Initial schema

Revision ID: 001
Revises:
Create Date: 2026-01-22

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

# revision identifiers, used by Alembic.
revision: str = '001'
down_revision: Union[str, None] = None
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # Create teams table
    op.create_table(
        'teams',
        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
        sa.Column('name', sa.String(255), nullable=False),
        sa.Column('created_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
        sa.PrimaryKeyConstraint('id')
    )

    # Create users table
    op.create_table(
        'users',
        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
        sa.Column('email', sa.String(255), nullable=False),
        sa.Column('password_hash', sa.String(255), nullable=False),
        sa.Column('name', sa.String(255), nullable=False),
        sa.Column('role', sa.String(50), nullable=False, server_default='engineer'),
        sa.Column('team_id', postgresql.UUID(as_uuid=True), nullable=True),
        sa.Column('created_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
        sa.Column('last_login', sa.DateTime(), nullable=True),
        sa.ForeignKeyConstraint(['team_id'], ['teams.id'], ),
        sa.PrimaryKeyConstraint('id'),
        sa.UniqueConstraint('email')
    )
    op.create_index('idx_users_email', 'users', ['email'], unique=True)

    # Create trees table
    op.create_table(
        'trees',
        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
        sa.Column('name', sa.String(255), nullable=False),
        sa.Column('description', sa.Text(), nullable=True),
        sa.Column('category', sa.String(100), nullable=True),
        sa.Column('tree_structure', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
        sa.Column('author_id', postgresql.UUID(as_uuid=True), nullable=True),
        sa.Column('team_id', postgresql.UUID(as_uuid=True), nullable=True),
        sa.Column('is_active', sa.Boolean(), server_default='true', nullable=True),
        sa.Column('version', sa.Integer(), server_default='1', nullable=True),
        sa.Column('created_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
        sa.Column('updated_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
        sa.Column('usage_count', sa.Integer(), server_default='0', nullable=True),
        sa.ForeignKeyConstraint(['author_id'], ['users.id'], ),
        sa.ForeignKeyConstraint(['team_id'], ['teams.id'], ),
        sa.PrimaryKeyConstraint('id')
    )
    op.create_index('idx_trees_category', 'trees', ['category'], unique=False)
    op.create_index('idx_trees_team', 'trees', ['team_id'], unique=False)
    # Full-text search index
    op.execute(
        "CREATE INDEX idx_trees_search ON trees USING gin(to_tsvector('english', coalesce(name, '') || ' ' || coalesce(description, '')))"
    )

    # Create sessions table
    op.create_table(
        'sessions',
        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
        sa.Column('tree_id', postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column('user_id', postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column('tree_snapshot', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
        sa.Column('path_taken', postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default='[]'),
        sa.Column('decisions', postgresql.JSONB(astext_type=sa.Text()), nullable=False, server_default='[]'),
        sa.Column('started_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
        sa.Column('completed_at', sa.DateTime(), nullable=True),
        sa.Column('ticket_number', sa.String(100), nullable=True),
        sa.Column('client_name', sa.String(255), nullable=True),
        sa.Column('exported', sa.Boolean(), server_default='false', nullable=True),
        sa.ForeignKeyConstraint(['tree_id'], ['trees.id'], ),
        sa.ForeignKeyConstraint(['user_id'], ['users.id'], ),
        sa.PrimaryKeyConstraint('id')
    )
    op.create_index('idx_sessions_user', 'sessions', ['user_id'], unique=False)
    op.create_index('idx_sessions_tree', 'sessions', ['tree_id'], unique=False)
    op.create_index('idx_sessions_dates', 'sessions', ['started_at', 'completed_at'], unique=False)

    # Create attachments table
    op.create_table(
        'attachments',
        sa.Column('id', postgresql.UUID(as_uuid=True), server_default=sa.text('gen_random_uuid()'), nullable=False),
        sa.Column('session_id', postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column('node_id', sa.String(100), nullable=True),
        sa.Column('file_name', sa.String(255), nullable=False),
        sa.Column('file_type', sa.String(50), nullable=True),
        sa.Column('file_size', sa.Integer(), nullable=True),
        sa.Column('storage_path', sa.String(500), nullable=True),
        sa.Column('uploaded_at', sa.DateTime(), server_default=sa.text('NOW()'), nullable=True),
        sa.ForeignKeyConstraint(['session_id'], ['sessions.id'], ),
        sa.PrimaryKeyConstraint('id')
    )


def downgrade() -> None:
    op.drop_table('attachments')
    op.drop_index('idx_sessions_dates', table_name='sessions')
    op.drop_index('idx_sessions_tree', table_name='sessions')
    op.drop_index('idx_sessions_user', table_name='sessions')
    op.drop_table('sessions')
    op.drop_index('idx_trees_search', table_name='trees')
    op.drop_index('idx_trees_team', table_name='trees')
    op.drop_index('idx_trees_category', table_name='trees')
    op.drop_table('trees')
    op.drop_index('idx_users_email', table_name='users')
    op.drop_table('users')
    op.drop_table('teams')