"""add fire_target table for the FIRE-countdown solver

Revision ID: 0007
Revises: 0006
Create Date: 2026-06-28 00:00:00.000000

One solved FIRE number per (case, country, with_home, bar). The Grafana
countdown reads target_nw_gbp for the selected country and diffs it against
current liquid net worth. Seeded on liquid NW; the pension joins as
pension_at_unlock_gbp (see docs/adr/0001).
"""
from collections.abc import Sequence

import sqlalchemy as sa

from alembic import op

revision: str = "0007"
down_revision: str | None = "0006"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None

SCHEMA = "fire_planner"


def upgrade() -> None:
    op.create_table(
        "fire_target",
        sa.Column("id", sa.Integer(), nullable=False, autoincrement=True),
        sa.Column("case", sa.String(length=16), nullable=False),
        sa.Column("country_slug", sa.String(length=64), nullable=False),
        sa.Column("country_display", sa.String(length=128), nullable=False),
        sa.Column("jurisdiction", sa.String(length=32), nullable=False),
        sa.Column("with_home", sa.Boolean(), nullable=False, server_default=sa.text("false")),
        sa.Column("bar", sa.Numeric(4, 3), nullable=False, server_default=sa.text("0.99")),
        sa.Column("strategy", sa.String(length=32), nullable=False,
                  server_default=sa.text("'guyton_klinger'")),
        sa.Column("annual_spend_gbp", sa.Numeric(12, 2), nullable=False),
        sa.Column("target_nw_gbp", sa.Numeric(16, 2), nullable=False),
        sa.Column("pension_at_unlock_gbp", sa.Numeric(16, 2), nullable=False,
                  server_default=sa.text("0")),
        sa.Column("success_at_target", sa.Numeric(6, 4), nullable=False),
        sa.Column("reached_bar", sa.Boolean(), nullable=False, server_default=sa.text("true")),
        sa.Column("horizon_years", sa.Integer(), nullable=False),
        sa.Column("n_paths", sa.Integer(), nullable=False),
        sa.Column("updated_at", sa.TIMESTAMP(timezone=True), nullable=False,
                  server_default=sa.func.now()),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint("case", "country_slug", "with_home", "bar",
                            name="uq_fire_target_case_country_home_bar"),
        schema=SCHEMA,
    )
    op.create_index("ix_fire_target_case", "fire_target", ["case"], schema=SCHEMA)
    op.create_index("ix_fire_target_country_slug", "fire_target", ["country_slug"], schema=SCHEMA)


def downgrade() -> None:
    op.drop_index("ix_fire_target_country_slug", table_name="fire_target", schema=SCHEMA)
    op.drop_index("ix_fire_target_case", table_name="fire_target", schema=SCHEMA)
    op.drop_table("fire_target", schema=SCHEMA)