"""FlowDeck — Database layer (SQLite with WAL mode)."""
from __future__ import annotations

import sqlite3
from contextlib import contextmanager
from pathlib import Path


def get_db_path() -> Path:
    from app.config import settings
    return settings.db_path


def init_db():
    """Create tables if they don't exist."""
    db_path = get_db_path()
    db_path.parent.mkdir(parents=True, exist_ok=True)

    with get_conn() as conn:
        conn.execute("PRAGMA journal_mode=WAL")
        conn.execute("PRAGMA foreign_keys=ON")
        conn.executescript("""
            CREATE TABLE IF NOT EXISTS boards (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_owner TEXT NOT NULL,
                project_name TEXT NOT NULL,
                columns_json TEXT NOT NULL DEFAULT '["Backlog","À faire","En cours","Révision","Terminé"]',
                wip_limits_json TEXT DEFAULT '{}',
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(project_owner, project_name)
            );

            CREATE TABLE IF NOT EXISTS cards (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                board_id INTEGER NOT NULL REFERENCES boards(id),
                gitea_issue_id INTEGER,
                column_name TEXT NOT NULL DEFAULT 'Backlog',
                position INTEGER NOT NULL DEFAULT 0,
                priority TEXT DEFAULT 'Medium',
                due_date TEXT,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            );

            CREATE TABLE IF NOT EXISTS notes (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                project_owner TEXT NOT NULL,
                project_name TEXT NOT NULL,
                title TEXT NOT NULL DEFAULT 'Notes',
                content TEXT NOT NULL DEFAULT '',
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                UNIQUE(project_owner, project_name, title)
            );

            CREATE TABLE IF NOT EXISTS col_mapping (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                board_id INTEGER NOT NULL REFERENCES boards(id),
                column_name TEXT NOT NULL,
                gitea_label TEXT NOT NULL,
                close_issue BOOLEAN NOT NULL DEFAULT 0,
                UNIQUE(board_id, column_name)
            );
        """)
        conn.commit()


@contextmanager
def get_conn():
    """Yield a SQLite connection (WAL mode, foreign keys on)."""
    db_path = get_db_path()
    conn = sqlite3.connect(str(db_path))
    conn.row_factory = sqlite3.Row
    conn.execute("PRAGMA journal_mode=WAL")
    conn.execute("PRAGMA foreign_keys=ON")
    try:
        yield conn
    finally:
        conn.close()