---

from datetime import date
from flask import Blueprint, render_template, request, abort, redirect, url_for, flash
from flask_login import login_required, current_user
from app.models import db, Intern, Attendance, User
from app.services.statistics import intern_stats, monthly_calendar
from app.utils import parse_period

interns_bp = Blueprint("interns", __name__, url_prefix="/interns")

def _can_access(intern: Intern) -> bool:
    return current_user.is_center or intern.mentor_id == current_user.id

@interns_bp.route("/")
@login_required
def list_interns():
    # Показываем архив только по запросу ?archive=1
    show_archive = request.args.get("archive") == "1"
    q = Intern.query.filter_by(is_archived=show_archive)
    
    if current_user.is_center:
        mentor_id = request.args.get("mentor_id", type=int)
        if mentor_id:
            q = q.filter_by(mentor_id=mentor_id)
    else:
        q = q.filter_by(mentor_id=current_user.id)

    interns = q.order_by(Intern.full_name).all()
    mentors = User.query.filter_by(role="mentor").order_by(User.full_name).all() if current_user.is_center else []

    return render_template(
        "interns/list.html", 
        interns=interns, 
        mentors=mentors, 
        show_archive=show_archive,
        selected_mentor=request.args.get("mentor_id", type=int)
    )

@interns_bp.route("/<int:intern_id>")
@login_required
def detail(intern_id: int):
    intern = Intern.query.get_or_404(intern_id)
    if not _can_access(intern): abort(403)

    today = date.today()
    year = request.args.get("year", today.year, type=int)
    month = request.args.get("month", today.month, type=int)

    if month < 1: month, year = 12, year - 1
    elif month > 12: month, year = 1, year + 1

    weeks = monthly_calendar(year, month)
    records = Attendance.query.filter_by(intern_id=intern_id).all()
    att_map = {r.date.day: r for r in records if r.date.year == year and r.date.month == month}

    date_from, date_to = parse_period(default_days=30)
    stats_period = intern_stats(intern_id, date_from, date_to)
    stats_all = intern_stats(intern_id)

    prev_year, prev_month = (year, month - 1) if month > 1 else (year - 1, 12)
    next_year, next_month = (year, month + 1) if month < 12 else (year + 1, 1)

    return render_template(
        "interns/detail.html",
        intern=intern, weeks=weeks, year=year, month=month, att_map=att_map,
        stats_period=stats_period, stats_all=stats_all, today=today,
        date_from=date_from, date_to=date_to,
        prev_year=prev_year, prev_month=prev_month, next_year=next_year, next_month=next_month,
    )

@interns_bp.route("/<int:intern_id>/assign", methods=["POST"])
@login_required
def assign_mentor(intern_id: int):
    if not current_user.is_center: abort(403)
    intern = Intern.query.get_or_404(intern_id)
    mentor_id = request.form.get("mentor_id", type=int)
    if mentor_id:
        intern.mentor_id = mentor_id
        db.session.commit()
        flash("Наставник успешно изменен", "success")
    return redirect(request.referrer or url_for("main.dashboard"))

@interns_bp.route("/<int:intern_id>/archive", methods=["POST"])
@login_required
def archive_intern(intern_id: int):
    if not current_user.is_center: abort(403)
    intern = Intern.query.get_or_404(intern_id)
    intern.is_archived = True
    db.session.commit()
    flash(f"Стажёр {intern.full_name} перемещён в архив", "info")
    return redirect(request.referrer or url_for("main.dashboard"))

# 👇 НОВЫЙ МАРШРУТ: Восстановление из архива
@interns_bp.route("/<int:intern_id>/restore", methods=["POST"])
@login_required
def restore_intern(intern_id: int):
    if not current_user.is_center: abort(403)
    intern = Intern.query.get_or_404(intern_id)
    intern.is_archived = False
    db.session.commit()
    flash(f"Стажёр {intern.full_name} возвращён из архива", "success")
    return redirect(request.referrer or url_for("interns.list_interns", archive=1))