"""Initial schema: users, refresh_tokens, subscriptions.

Revision ID: 001
Revises:
Create Date: 2026-03-02
"""

from __future__ import annotations

from typing import Sequence, Union

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

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:
    # ── Enum types — idempotent creation via exception handling ───────────
    op.execute("""
        DO $$ BEGIN
            CREATE TYPE billing_tier AS ENUM ('free', 'pro', 'power', 'team');
        EXCEPTION WHEN duplicate_object THEN NULL;
        END $$;
    """)

    # ── users ─────────────────────────────────────────────────────────────
    op.create_table(
        "users",
        sa.Column("id", postgresql.UUID(as_uuid=False), nullable=False),
        sa.Column("email", sa.String(255), nullable=False),
        sa.Column("password_hash", sa.String(255), nullable=False),
        sa.Column("tier", postgresql.ENUM("free", "pro", "power", "team", name="billing_tier", create_type=False), nullable=False, server_default="free"),
        sa.Column("stripe_customer_id", sa.String(255), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("email"),
    )
    op.create_index("ix_users_email", "users", ["email"])

    # ── refresh_tokens ────────────────────────────────────────────────────
    op.create_table(
        "refresh_tokens",
        sa.Column("id", postgresql.UUID(as_uuid=False), nullable=False),
        sa.Column("user_id", postgresql.UUID(as_uuid=False), nullable=False),
        sa.Column("token_hash", sa.String(64), nullable=False),
        sa.Column("expires_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
        sa.PrimaryKeyConstraint("id"),
        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
        sa.UniqueConstraint("token_hash"),
    )
    op.create_index("ix_refresh_tokens_user_id", "refresh_tokens", ["user_id"])
    op.create_index("ix_refresh_tokens_token_hash", "refresh_tokens", ["token_hash"])

    # ── subscriptions ─────────────────────────────────────────────────────
    op.create_table(
        "subscriptions",
        sa.Column("id", postgresql.UUID(as_uuid=False), nullable=False),
        sa.Column("user_id", postgresql.UUID(as_uuid=False), nullable=False),
        sa.Column("stripe_subscription_id", sa.String(255), nullable=True),
        sa.Column("tier", postgresql.ENUM("free", "pro", "power", "team", name="billing_tier", create_type=False), nullable=False, server_default="free"),
        sa.Column("status", sa.String(50), nullable=False, server_default="free"),
        sa.Column("current_period_end", sa.DateTime(timezone=True), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
        sa.PrimaryKeyConstraint("id"),
        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
        sa.UniqueConstraint("user_id"),
    )
    op.create_index("ix_subscriptions_user_id", "subscriptions", ["user_id"])
    op.create_index("ix_subscriptions_stripe_id", "subscriptions", ["stripe_subscription_id"])


def downgrade() -> None:
    op.drop_table("subscriptions")
    op.drop_table("refresh_tokens")
    op.drop_table("users")

    op.execute("DROP TYPE IF EXISTS billing_tier")