"""Add 'deduced' to parental_leave_fetch.source's CHECK constraint.

`source` gains a third value alongside 'scraped'/'manual': 'deduced', for a
snapshot the app derived on the user's behalf (e.g. defaulting an unentered
total) rather than one FK reported or the user typed in directly. SQLite has
no `ALTER TABLE ... DROP/ADD CONSTRAINT`, so the table is recreated with the
new CHECK and its rows copied across — the standard SQLite migration dance
(see e.g. https://sqlite.org/lang_altertable.html#otheralter). Recreating the
table also drops its indexes, so they're recreated afterwards.

Must stay byte-for-byte equivalent, CHECK-constraint-wise, to
`parental_leave_fetch` in `app/db/connection.py`'s `_FULL_SCHEMA` —
`tests/integration/test_schema_parity.py` asserts exactly that.

Revision ID: 002
Revises: 001
Create Date: 2026-09-19
"""

from __future__ import annotations

from alembic import op

revision: str = "002"
down_revision: str | None = "001"
branch_labels: str | None = None
depends_on: str | None = None

_UPGRADE_SQL = """
CREATE TABLE parental_leave_fetch_new (
    id TEXT PRIMARY KEY,
    personal_data_uuid TEXT NOT NULL,
    workspace_id TEXT NOT NULL,
    child_id TEXT NOT NULL,
    source TEXT NOT NULL CHECK (source IN ('scraped','manual','deduced')),
    fetched_at TIMESTAMP NOT NULL,
    total_days INTEGER NOT NULL,
    days_used INTEGER NOT NULL,
    days_left INTEGER NOT NULL,
    reserved_days_total INTEGER NOT NULL DEFAULT 90,
    reserved_days_left INTEGER NOT NULL,
    transferable_days_left INTEGER NOT NULL,
    dubbeldagar_left INTEGER NOT NULL,
    tier_data TEXT NOT NULL,
    created_at TIMESTAMP NOT NULL,
    updated_at TIMESTAMP NOT NULL,
    FOREIGN KEY (personal_data_uuid) REFERENCES personal_data(uuid) ON DELETE CASCADE,
    FOREIGN KEY (workspace_id) REFERENCES workspace(id) ON DELETE CASCADE,
    FOREIGN KEY (child_id) REFERENCES child(id) ON DELETE CASCADE
);

INSERT INTO parental_leave_fetch_new (
    id, personal_data_uuid, workspace_id, child_id, source, fetched_at,
    total_days, days_used, days_left, reserved_days_total, reserved_days_left,
    transferable_days_left, dubbeldagar_left, tier_data, created_at, updated_at
)
SELECT
    id, personal_data_uuid, workspace_id, child_id, source, fetched_at,
    total_days, days_used, days_left, reserved_days_total, reserved_days_left,
    transferable_days_left, dubbeldagar_left, tier_data, created_at, updated_at
FROM parental_leave_fetch;

DROP TABLE parental_leave_fetch;

ALTER TABLE parental_leave_fetch_new RENAME TO parental_leave_fetch;

CREATE INDEX IF NOT EXISTS idx_plf_parent_child_fetched
    ON parental_leave_fetch (personal_data_uuid, child_id, fetched_at);
CREATE INDEX IF NOT EXISTS idx_plf_workspace
    ON parental_leave_fetch (workspace_id);
CREATE INDEX IF NOT EXISTS idx_plf_child
    ON parental_leave_fetch (child_id);
"""

_DOWNGRADE_SQL = """
CREATE TABLE parental_leave_fetch_old (
    id TEXT PRIMARY KEY,
    personal_data_uuid TEXT NOT NULL,
    workspace_id TEXT NOT NULL,
    child_id TEXT NOT NULL,
    source TEXT NOT NULL CHECK (source IN ('scraped','manual')),
    fetched_at TIMESTAMP NOT NULL,
    total_days INTEGER NOT NULL,
    days_used INTEGER NOT NULL,
    days_left INTEGER NOT NULL,
    reserved_days_total INTEGER NOT NULL DEFAULT 90,
    reserved_days_left INTEGER NOT NULL,
    transferable_days_left INTEGER NOT NULL,
    dubbeldagar_left INTEGER NOT NULL,
    tier_data TEXT NOT NULL,
    created_at TIMESTAMP NOT NULL,
    updated_at TIMESTAMP NOT NULL,
    FOREIGN KEY (personal_data_uuid) REFERENCES personal_data(uuid) ON DELETE CASCADE,
    FOREIGN KEY (workspace_id) REFERENCES workspace(id) ON DELETE CASCADE,
    FOREIGN KEY (child_id) REFERENCES child(id) ON DELETE CASCADE
);

INSERT INTO parental_leave_fetch_old (
    id, personal_data_uuid, workspace_id, child_id, source, fetched_at,
    total_days, days_used, days_left, reserved_days_total, reserved_days_left,
    transferable_days_left, dubbeldagar_left, tier_data, created_at, updated_at
)
SELECT
    id, personal_data_uuid, workspace_id, child_id, source, fetched_at,
    total_days, days_used, days_left, reserved_days_total, reserved_days_left,
    transferable_days_left, dubbeldagar_left, tier_data, created_at, updated_at
FROM parental_leave_fetch
WHERE source != 'deduced';

DROP TABLE parental_leave_fetch;

ALTER TABLE parental_leave_fetch_old RENAME TO parental_leave_fetch;

CREATE INDEX IF NOT EXISTS idx_plf_parent_child_fetched
    ON parental_leave_fetch (personal_data_uuid, child_id, fetched_at);
CREATE INDEX IF NOT EXISTS idx_plf_workspace
    ON parental_leave_fetch (workspace_id);
CREATE INDEX IF NOT EXISTS idx_plf_child
    ON parental_leave_fetch (child_id);
"""


def upgrade() -> None:
    from sqlalchemy import text

    for stmt in [s.strip() for s in _UPGRADE_SQL.split(";") if s.strip()]:
        op.execute(text(stmt))


def downgrade() -> None:
    from sqlalchemy import text

    for stmt in [s.strip() for s in _DOWNGRADE_SQL.split(";") if s.strip()]:
        op.execute(text(stmt))