"""add US stock trading support

미국 주식 매매 지원을 위한 스키마 확장.
- portfolio, trade_history, active_trades에 currency_code, exchange_code 컬럼 추가
- trade_history에 fx_rate(체결 시점 환율) 컬럼 추가
- exchange_rates 환율 이력 테이블 생성
- us_stock_universe 미국 종목 유니버스 테이블 생성

Revision ID: 0004
Revises: 0003
Create Date: 2026-03-10

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy import inspect as sa_inspect

revision: str = "0004"
down_revision: Union[str, None] = "0003"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # ── portfolio: currency_code, exchange_code 추가 ──────────────────────
    with op.batch_alter_table("portfolio", schema=None) as batch_op:
        batch_op.add_column(
            sa.Column(
                "currency_code",
                sa.String(3),
                nullable=False,
                server_default="KRW",
            )
        )
        batch_op.add_column(
            sa.Column(
                "exchange_code",
                sa.String(10),
                nullable=True,
            )
        )
        batch_op.create_index(
            "ix_portfolio_currency_code",
            ["currency_code"],
        )

    # ── trade_history: currency_code, exchange_code, fx_rate 추가 ────────
    with op.batch_alter_table("trade_history", schema=None) as batch_op:
        batch_op.add_column(
            sa.Column(
                "currency_code",
                sa.String(3),
                nullable=False,
                server_default="KRW",
            )
        )
        batch_op.add_column(
            sa.Column(
                "exchange_code",
                sa.String(10),
                nullable=True,
            )
        )
        batch_op.add_column(
            sa.Column(
                "fx_rate",
                sa.Numeric(10, 4),
                nullable=True,
            )
        )
        batch_op.create_index(
            "ix_trade_history_currency_code",
            ["currency_code"],
        )

    # ── active_trades: currency_code, exchange_code 추가 ─────────────────
    with op.batch_alter_table("active_trades", schema=None) as batch_op:
        batch_op.add_column(
            sa.Column(
                "currency_code",
                sa.String(3),
                nullable=False,
                server_default="KRW",
            )
        )
        batch_op.add_column(
            sa.Column(
                "exchange_code",
                sa.String(10),
                nullable=True,
            )
        )
        batch_op.create_index(
            "ix_active_trades_currency_code",
            ["currency_code"],
        )

    # ── exchange_rates 테이블 생성 (이미 존재하면 스킵) ────────────────────
    bind = op.get_bind()
    inspector = sa_inspect(bind)
    existing_tables = inspector.get_table_names()

    if "exchange_rates" not in existing_tables:
        op.create_table(
            "exchange_rates",
            sa.Column("id", sa.Integer, primary_key=True, index=True),
            sa.Column("currency_pair", sa.String(7), nullable=False, index=True),
            sa.Column("rate", sa.Numeric(12, 4), nullable=False),
            sa.Column("source", sa.String(50), server_default="KIS"),
            sa.Column("recorded_at", sa.DateTime, server_default=sa.func.now(), index=True),
        )

    # ── us_stock_universe 테이블 생성 (이미 존재하면 스킵) ─────────────────
    if "us_stock_universe" not in existing_tables:
        op.create_table(
            "us_stock_universe",
            sa.Column("id", sa.Integer, primary_key=True, index=True),
            sa.Column("ticker", sa.String(10), nullable=False, index=True),
            sa.Column("company_name", sa.String(200), nullable=False),
            sa.Column("exchange", sa.String(10), nullable=False),
            sa.Column("sector", sa.String(100), nullable=True),
            sa.Column("market_cap", sa.BigInteger, nullable=True),
            sa.Column("is_active", sa.Boolean, server_default=sa.text("true"), index=True),
            sa.Column("updated_at", sa.DateTime, server_default=sa.func.now()),
            sa.UniqueConstraint("ticker", name="uq_us_ticker"),
        )


def downgrade() -> None:
    # ── 테이블 삭제 ──────────────────────────────────────────────────────
    op.drop_table("us_stock_universe")
    op.drop_table("exchange_rates")

    # ── active_trades 롤백 ───────────────────────────────────────────────
    with op.batch_alter_table("active_trades", schema=None) as batch_op:
        batch_op.drop_index("ix_active_trades_currency_code")
        batch_op.drop_column("exchange_code")
        batch_op.drop_column("currency_code")

    # ── trade_history 롤백 ───────────────────────────────────────────────
    with op.batch_alter_table("trade_history", schema=None) as batch_op:
        batch_op.drop_index("ix_trade_history_currency_code")
        batch_op.drop_column("fx_rate")
        batch_op.drop_column("exchange_code")
        batch_op.drop_column("currency_code")

    # ── portfolio 롤백 ───────────────────────────────────────────────────
    with op.batch_alter_table("portfolio", schema=None) as batch_op:
        batch_op.drop_index("ix_portfolio_currency_code")
        batch_op.drop_column("exchange_code")
        batch_op.drop_column("currency_code")