"""add budgets and budget alerts tables

Revision ID: add_budget_tables
Revises: add_model_capability_tables
Create Date: 2026-02-25
"""

from alembic import op
import sqlalchemy as sa

revision = "add_budget_tables"
down_revision = "add_model_capability_tables"
branch_labels = None
depends_on = None


def _table_exists(table_name: str) -> bool:
    bind = op.get_bind()
    inspector = sa.inspect(bind)
    return table_name in inspector.get_table_names()


def upgrade():
    if not _table_exists("budgets"):
        op.create_table(
            "budgets",
            sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False),
            sa.Column("budget_type", sa.String(length=20), nullable=False),
            sa.Column("project_id", sa.BigInteger(), nullable=True),
            sa.Column("period", sa.String(length=20), nullable=False),
            sa.Column("budget_amount_usd", sa.DECIMAL(12, 2), nullable=False, server_default="0"),
            sa.Column("alert_threshold_percent", sa.Float(), nullable=False, server_default="80"),
            sa.Column("hard_limit_enabled", sa.Boolean(), nullable=False, server_default=sa.true()),
            sa.Column("current_usage_usd", sa.DECIMAL(12, 2), nullable=False, server_default="0"),
            sa.Column("current_period_start", sa.TIMESTAMP(), nullable=True),
            sa.Column("current_period_end", sa.TIMESTAMP(), nullable=True),
            sa.Column("status", sa.String(length=20), nullable=False, server_default="active"),
            sa.Column("override_history", sa.JSON(), nullable=False),
            sa.Column("created_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
            sa.Column("updated_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
            sa.ForeignKeyConstraint(["project_id"], ["projects.id"]),
        )
        op.create_index("ix_budgets_tenant_id", "budgets", ["tenant_id"])
        op.create_index("ix_budgets_budget_type", "budgets", ["budget_type"])
        op.create_index("ix_budgets_project_id", "budgets", ["project_id"])

    if not _table_exists("budget_alerts"):
        op.create_table(
            "budget_alerts",
            sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False),
            sa.Column("budget_id", sa.BigInteger(), nullable=False),
            sa.Column("alert_type", sa.String(length=50), nullable=False),
            sa.Column("usage_usd", sa.DECIMAL(12, 2), nullable=False, server_default="0"),
            sa.Column("usage_percent", sa.Float(), nullable=False, server_default="0"),
            sa.Column("message", sa.Text(), nullable=False),
            sa.Column("is_read", sa.Boolean(), nullable=False, server_default=sa.false()),
            sa.Column("action_taken", sa.String(length=50), nullable=True),
            sa.Column("status", sa.String(length=20), nullable=False, server_default="active"),
            sa.Column("created_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
            sa.Column("updated_at", sa.TIMESTAMP(), nullable=False, server_default=sa.func.now()),
            sa.ForeignKeyConstraint(["budget_id"], ["budgets.id"]),
        )
        op.create_index("ix_budget_alerts_tenant_id", "budget_alerts", ["tenant_id"])
        op.create_index("ix_budget_alerts_budget_id", "budget_alerts", ["budget_id"])
        op.create_index("ix_budget_alerts_alert_type", "budget_alerts", ["alert_type"])


def downgrade():
    if _table_exists("budget_alerts"):
        op.drop_index("ix_budget_alerts_alert_type", table_name="budget_alerts")
        op.drop_index("ix_budget_alerts_budget_id", table_name="budget_alerts")
        op.drop_index("ix_budget_alerts_tenant_id", table_name="budget_alerts")
        op.drop_table("budget_alerts")

    if _table_exists("budgets"):
        op.drop_index("ix_budgets_project_id", table_name="budgets")
        op.drop_index("ix_budgets_budget_type", table_name="budgets")
        op.drop_index("ix_budgets_tenant_id", table_name="budgets")
        op.drop_table("budgets")