from flask import Flask
from flask_sqlalchemy import SQLAlchemy
import tomllib
import os
import sqlalchemy as sa

db = SQLAlchemy()


def _migrate_db(app):
    """Applique les migrations de schéma manquantes (pas d'Alembic)."""
    import sqlite3
    db_path = os.path.join(app.instance_path, "worklog.db")
    if not os.path.exists(db_path):
        return  # Nouvelle DB, create_all() s'en charge
    conn = sqlite3.connect(db_path)
    tables = {row[0] for row in conn.execute("SELECT name FROM sqlite_master WHERE type='table'")}
    if "work_entries" not in tables:
        conn.close()
        return  # Table pas encore créée, create_all() s'en charge
    columns = {row[1] for row in conn.execute("PRAGMA table_info(work_entries)").fetchall()}
    conn.close()

    with app.app_context():
        engine = db.engine
        if "motor_vehicle_id" not in columns:
            with engine.connect() as conn:
                conn.execute(sa.text(
                    "ALTER TABLE work_entries ADD COLUMN motor_vehicle_id VARCHAR(64)"
                ))
                conn.commit()


_JOURS_FR = ["lundi", "mardi", "mercredi", "jeudi", "vendredi", "samedi", "dimanche"]
_MOIS_FR = ["", "janvier", "février", "mars", "avril", "mai", "juin",
            "juillet", "août", "septembre", "octobre", "novembre", "décembre"]


_DAY_TYPE_LABELS = {
    "WORK":       "Travail",
    "TT":         "Télétravail",
    "GARDE":      "Garde",
    "ASTREINTE":  "Astreinte",
    "FORMATION":  "Formation",
    "RTT":        "RTT",
    "CONGE":      "Congé",
    "MALADE":     "Maladie",
    "FERIE":      "Férié",
}


def _day_type_fr(code):
    return _DAY_TYPE_LABELS.get(code, code)


def _date_fr(d):
    """Formate une date en français : 'mercredi 11 mars 2026'."""
    from datetime import date as date_type
    jour = _JOURS_FR[d.weekday()]
    mois = _MOIS_FR[d.month]
    return f"{jour} {d.day} {mois} {d.year}"


def create_app(config_path=None):
    app = Flask(__name__, instance_relative_config=True)

    os.makedirs(app.instance_path, exist_ok=True)

    app.config["SQLALCHEMY_DATABASE_URI"] = f"sqlite:///{os.path.join(app.instance_path, 'worklog.db')}"
    app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
    app.config["SECRET_KEY"] = os.environ.get("SECRET_KEY", "dev-secret-change-in-prod")

    # Load TOML config
    if config_path is None:
        config_path = os.path.join(os.path.dirname(app.root_path), "config.toml")
    if os.path.exists(config_path):
        with open(config_path, "rb") as f:
            app.config["TOML"] = tomllib.load(f)
    else:
        app.config["TOML"] = {}

    db.init_app(app)
    app.jinja_env.filters["date_fr"] = _date_fr
    app.jinja_env.filters["day_type_fr"] = _day_type_fr

    from app.routes.dashboard import bp as dashboard_bp
    from app.routes.entries import bp as entries_bp
    from app.routes.reports import bp as reports_bp
    app.register_blueprint(dashboard_bp)
    app.register_blueprint(entries_bp)
    app.register_blueprint(reports_bp)

    with app.app_context():
        _migrate_db(app)
        db.create_all()

    return app