"""Database connection management.

Production: the schema is owned by Alembic (`alembic upgrade head`). The
`run_migrations()` helper below calls Alembic programmatically from the app
lifespan so the first boot auto-migrates on SQLite (dev convenience).

Tests: `ensure_schema()` applies the full DDL directly to an in-memory
connection so test fixtures stay fast and do not depend on Alembic.
"""

from __future__ import annotations

import aiosqlite

# Full schema used by test fixtures directly (avoids a full Alembic run in tests).
# This MUST stay in sync with migrations/versions/001_initial_schema.py.
_FULL_SCHEMA = """
CREATE TABLE IF NOT EXISTS workspace (
    id TEXT PRIMARY KEY,
    name TEXT NOT NULL,
    planning_goal TEXT NOT NULL DEFAULT 'balanced'
        CHECK (planning_goal IN ('max_time','max_money','balanced')),
    created_at TIMESTAMP NOT NULL
);

CREATE TABLE IF NOT EXISTS personal_data (
    uuid TEXT PRIMARY KEY,
    workspace_id TEXT NOT NULL,
    name TEXT NOT NULL,
    salary_type TEXT NOT NULL DEFAULT 'monthly'
        CHECK (salary_type IN ('monthly','hourly')),
    employment_status TEXT NOT NULL DEFAULT 'employed'
        CHECK (employment_status IN ('employed','jobseeking','none')),
    personnummer_enc TEXT,
    created_at TIMESTAMP NOT NULL,
    deleted_at TIMESTAMP,
    FOREIGN KEY (workspace_id) REFERENCES workspace(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS "user" (
    id TEXT PRIMARY KEY,
    personal_data_uuid TEXT NOT NULL UNIQUE,
    email TEXT NOT NULL UNIQUE,
    hashed_password TEXT NOT NULL,
    created_at TIMESTAMP NOT NULL,
    FOREIGN KEY (personal_data_uuid) REFERENCES personal_data(uuid) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS workspace_invitation (
    id TEXT PRIMARY KEY,
    workspace_id TEXT NOT NULL,
    token_hash TEXT NOT NULL UNIQUE,
    invited_by_user_id TEXT NOT NULL,
    status TEXT NOT NULL CHECK (status IN ('pending','accepted','revoked','expired')),
    expires_at TIMESTAMP NOT NULL,
    created_at TIMESTAMP NOT NULL,
    accepted_at TIMESTAMP,
    FOREIGN KEY (workspace_id) REFERENCES workspace(id) ON DELETE CASCADE,
    FOREIGN KEY (invited_by_user_id) REFERENCES "user"(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS child (
    id TEXT PRIMARY KEY,
    workspace_id TEXT NOT NULL,
    name TEXT NOT NULL,
    birth_date DATE NOT NULL,
    preschool_start_date DATE,
    created_at TIMESTAMP NOT NULL,
    FOREIGN KEY (workspace_id) REFERENCES workspace(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS break_period (
    id TEXT PRIMARY KEY,
    workspace_id TEXT NOT NULL,
    name TEXT NOT NULL,
    start_date DATE NOT NULL,
    end_date DATE NOT NULL,
    target_weeks INTEGER NOT NULL,
    created_at TIMESTAMP NOT NULL,
    updated_at TIMESTAMP NOT NULL,
    FOREIGN KEY (workspace_id) REFERENCES workspace(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS parental_leave_fetch (
    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
);

CREATE TABLE IF NOT EXISTS vacation_days (
    id TEXT PRIMARY KEY,
    personal_data_uuid TEXT NOT NULL,
    workspace_id TEXT NOT NULL,
    year INTEGER NOT NULL,
    total_days INTEGER NOT NULL,
    saved_days_in INTEGER NOT NULL DEFAULT 0,
    created_at TIMESTAMP NOT NULL,
    updated_at TIMESTAMP NOT NULL,
    UNIQUE(personal_data_uuid, year),
    FOREIGN KEY (personal_data_uuid) REFERENCES personal_data(uuid) ON DELETE CASCADE,
    FOREIGN KEY (workspace_id) REFERENCES workspace(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS planned_leave_day (
    id TEXT PRIMARY KEY,
    workspace_id TEXT NOT NULL,
    child_id TEXT NOT NULL,
    parent_personal_data_uuid TEXT NOT NULL,
    date DATE NOT NULL,
    day_type TEXT NOT NULL CHECK (day_type IN ('sjukpenning','lagsta','vacation')),
    is_dubbeldag INTEGER NOT NULL DEFAULT 0,
    created_at TIMESTAMP NOT NULL,
    updated_at TIMESTAMP NOT NULL,
    UNIQUE(workspace_id, child_id, date, parent_personal_data_uuid),
    FOREIGN KEY (workspace_id) REFERENCES workspace(id) ON DELETE CASCADE,
    FOREIGN KEY (child_id) REFERENCES child(id) ON DELETE CASCADE,
    FOREIGN KEY (parent_personal_data_uuid) REFERENCES personal_data(uuid) ON DELETE CASCADE
);
"""


async def connect(path: str) -> aiosqlite.Connection:
    """Open a connection and enable row-by-name access + FK enforcement.

    Schema is applied via Alembic in the app lifespan (`run_migrations`).
    For test fixtures, call `ensure_schema` directly.
    """
    conn = await aiosqlite.connect(path)
    conn.row_factory = aiosqlite.Row
    await conn.execute("PRAGMA foreign_keys = ON;")
    return conn


async def ensure_schema(conn: aiosqlite.Connection) -> None:
    """Apply the full DDL directly. Used by test fixtures only."""
    await conn.executescript(_FULL_SCHEMA)
    await conn.commit()


def run_migrations(database_url: str | None = None) -> None:
    """Run any pending Alembic migrations (called from app lifespan).

    `database_url` overrides alembic.ini's sqlalchemy.url, allowing the app
    config's `sqlite_path` to take precedence over the ini default.
    """
    from alembic import command
    from alembic.config import Config

    cfg = Config("alembic.ini")
    if database_url:
        cfg.set_main_option("sqlalchemy.url", database_url)
    command.upgrade(cfg, "head")