"""Configuration des horaires et suivi annuel des heures de l'agent."""
from datetime import date, datetime, timedelta

from flask import flash, redirect, render_template, request, url_for
from flask_login import current_user, login_required

from ..extensions import db
from ..core.models.planning import (
    AnnualTimeConfig, ClosureWorkDay, CollegeClosure, TimeEntry,
    WorkSchedule, WorkScheduleTemplate,
)
from .schedules import planning_bp


def _time(value):
    return datetime.strptime(value, "%H:%M").time() if value else None


def _minutes(start, end, lunch_start=None, lunch_end=None):
    if not start or not end:
        return 0
    value = (end.hour * 60 + end.minute) - (start.hour * 60 + start.minute)
    if lunch_start and lunch_end:
        value -= (lunch_end.hour * 60 + lunch_end.minute) - (lunch_start.hour * 60 + lunch_start.minute)
    return max(value, 0)


def _valid_schedule(start, end, lunch_start=None, lunch_end=None):
    if not start or not end or end <= start:
        return False
    if bool(lunch_start) != bool(lunch_end):
        return False
    if lunch_start and (lunch_start < start or lunch_end > end or lunch_end <= lunch_start):
        return False
    return _minutes(start, end, lunch_start, lunch_end) > 0


def _redirect(year=None):
    return redirect(url_for("planning.time_tracking", year=year or _current_year()))


def _current_year():
    today = date.today()
    return today.year if today.month >= 9 else today.year - 1


def _period(year):
    """Année de travail : du 1er septembre au 31 août suivant."""
    return date(year, 9, 1), date(year + 1, 8, 31)


def _month_starts(start, end):
    """Retourne les premiers jours de chaque mois de la période comptable."""
    current = date(start.year, start.month, 1)
    result = []
    while current <= end:
        result.append(current)
        current = date(current.year + (current.month == 12), 1 if current.month == 12 else current.month + 1, 1)
    return result


@planning_bp.route("/time")
@login_required
def time_tracking():
    year = request.args.get("year", _current_year(), type=int)
    period_start, period_end = _period(year)
    config = AnnualTimeConfig.query.filter_by(user_id=current_user.id, year=year).first()
    if not config:
        config = AnnualTimeConfig(user_id=current_user.id, year=year)
        db.session.add(config)
        db.session.commit()
    templates = WorkScheduleTemplate.query.filter_by(user_id=current_user.id, is_active=True).order_by(WorkScheduleTemplate.id).all()
    assignments = {item.day_of_week: item for item in WorkSchedule.query.filter_by(user_id=current_user.id, is_active=True).all()}
    closures = CollegeClosure.query.filter(
        CollegeClosure.end_date >= period_start, CollegeClosure.start_date <= period_end
    ).order_by(CollegeClosure.start_date).all()
    from ..core.models.planning import ClosureSchedule, PersonalLeave, Training, TrainingParticipant
    from ..core.services.planning_service import get_french_public_holidays
    closure_ids = [item.id for item in closures]
    work_days = ClosureWorkDay.query.filter(ClosureWorkDay.closure_id.in_(closure_ids)).all() if closure_ids else []
    closure_schedules = ClosureSchedule.query.filter(ClosureSchedule.closure_id.in_(closure_ids), ClosureSchedule.is_active.is_(True)).all() if closure_ids else []
    work_day_map = {item.work_date: item for item in work_days}
    closure_schedule_map = {(item.closure_id, item.day_of_week): item for item in closure_schedules}
    holidays = {item[0] for item in get_french_public_holidays(year)} | {item[0] for item in get_french_public_holidays(year + 1)}
    leaves = PersonalLeave.query.filter(PersonalLeave.user_id == current_user.id, PersonalLeave.end_date >= period_start, PersonalLeave.start_date <= period_end).all()
    leave_dates = {day for leave in leaves for day in (leave.start_date + timedelta(days=i) for i in range((leave.end_date - leave.start_date).days + 1))}
    entries = TimeEntry.query.filter(
        TimeEntry.user_id == current_user.id,
        TimeEntry.work_date >= period_start, TimeEntry.work_date <= period_end,
    ).order_by(TimeEntry.work_date.desc()).all()
    planned = 0
    planned_minutes_by_month = {}
    permanence_minutes_by_month = {}
    for work_day in work_days:
        if period_start <= work_day.work_date <= period_end:
            month = date(work_day.work_date.year, work_day.work_date.month, 1)
            permanence_minutes_by_month[month] = permanence_minutes_by_month.get(month, 0) + _minutes(
                work_day.start_time, work_day.end_time, work_day.lunch_start, work_day.lunch_end
            )
    current = period_start
    while current <= period_end:
        hours = None
        if current not in holidays and current not in leave_dates:
            closure = next((item for item in closures if item.start_date <= current <= item.end_date), None)
            if closure:
                exceptional = work_day_map.get(current)
                if exceptional:
                    hours = (exceptional.start_time, exceptional.end_time, exceptional.lunch_start, exceptional.lunch_end)
                elif closure.work_hours_type == "reduced":
                    hours = (_time("09:00"), _time("12:00"), None, None)
                elif closure.work_hours_type == "custom":
                    item = closure_schedule_map.get((closure.id, current.weekday()))
                    if item:
                        hours = (item.start_time, item.end_time, item.lunch_start, item.lunch_end)
            elif current.weekday() < 5 and assignments.get(current.weekday()):
                assignment = assignments[current.weekday()]
                source = assignment.template if assignment.template and assignment.template.is_active else assignment
                hours = (source.start_time, source.end_time, source.lunch_start, source.lunch_end)
        if hours:
            day_minutes = _minutes(*hours)
            planned += day_minutes
            month = date(current.year, current.month, 1)
            planned_minutes_by_month[month] = planned_minutes_by_month.get(month, 0) + day_minutes
        current += timedelta(days=1)
    permanence_options = []
    permanence_groups = []
    for closure in closures:
        if closure.closure_type not in ("vacances", "vacances_scolaires"):
            continue
        current_day = max(closure.start_date, period_start)
        end_day = min(closure.end_date, period_end)
        while current_day <= end_day:
            if current_day.weekday() < 5:
                existing = work_day_map.get(current_day)
                permanence_options.append({"date": current_day, "closure": closure, "entry": existing})
            current_day += timedelta(days=1)
        if permanence_options:
            group_options = [item for item in permanence_options if item["closure"].id == closure.id]
            if group_options:
                permanence_groups.append({"closure": closure, "options": group_options})
    actual = sum(item.actual_minutes or 0 for item in entries)
    # Synthèse mensuelle : les permanences sont isolées du temps de travail
    # planifié habituel, et les formations viennent des convocations validées.
    monthly_summary = []
    trainings = Training.query.join(TrainingParticipant).filter(
        TrainingParticipant.user_id == current_user.id,
        TrainingParticipant.is_confirmed.is_(True),
        Training.end_date >= period_start,
        Training.start_date <= period_end,
    ).all()
    for month in _month_starts(period_start, period_end):
        month_end = date(month.year + (month.month == 12), 1 if month.month == 12 else month.month + 1, 1) - timedelta(days=1)
        month_entries = [item for item in entries if month <= item.work_date <= month_end]
        training_minutes = 0
        for training in trainings:
            start = max(training.start_date or month, month, period_start)
            end = min(training.end_date or start, month_end, period_end)
            if end < start:
                continue
            day = start
            while day <= end:
                if day.weekday() < 5:
                    if training.start_time and training.end_time:
                        training_minutes += _minutes(training.start_time, training.end_time)
                    elif assignments.get(day.weekday()):
                        assignment = assignments[day.weekday()]
                        source = assignment.template if assignment.template and assignment.template.is_active else assignment
                        training_minutes += _minutes(source.start_time, source.end_time, source.lunch_start, source.lunch_end)
                day += timedelta(days=1)
        monthly_summary.append({
            "month": month,
            "planned": max(planned_minutes_by_month.get(month, 0) - permanence_minutes_by_month.get(month, 0), 0),
            "permanence": permanence_minutes_by_month.get(month, 0),
            "retard": sum(item.actual_minutes or 0 for item in month_entries if item.entry_type == "retard"),
            "supplementaire": sum(item.actual_minutes or 0 for item in month_entries if item.entry_type == "supplementaire"),
            "formation": training_minutes,
        })
    # Solde restant selon la règle de l'agent : objectif - prévu - retards
    # + heures supplémentaires + formations.
    balance_minutes = config.minutes_to_work - sum(item["planned"] for item in monthly_summary) - sum(item["retard"] for item in monthly_summary) + sum(item["supplementaire"] for item in monthly_summary) + sum(item["formation"] for item in monthly_summary)
    return render_template(
        "planning/time_tracking.html", year=year, period_start=period_start, period_end=period_end, time_config=config, templates=templates,
        assignments=assignments, closures=closures, permanence_options=permanence_options, permanence_groups=permanence_groups, entries=entries,
        days={0: "Lundi", 1: "Mardi", 2: "Mercredi", 3: "Jeudi", 4: "Vendredi", 5: "Samedi", 6: "Dimanche"},
        months={1: "Janvier", 2: "Février", 3: "Mars", 4: "Avril", 5: "Mai", 6: "Juin", 7: "Juillet", 8: "Août", 9: "Septembre", 10: "Octobre", 11: "Novembre", 12: "Décembre"},
        planned_minutes=planned, actual_minutes=actual,
        required_minutes=config.minutes_to_work, variance_minutes=actual - config.minutes_to_work,
        balance_minutes=balance_minutes,
        monthly_summary=monthly_summary,
    )


@planning_bp.route("/time/config", methods=["POST"])
@login_required
def save_time_config():
    year = request.form.get("year", date.today().year, type=int)
    config = AnnualTimeConfig.query.filter_by(user_id=current_user.id, year=year).first()
    if not config:
        config = AnnualTimeConfig(user_id=current_user.id, year=year)
        db.session.add(config)
    config.target_minutes = round(float(request.form.get("target_hours") or 1607) * 60)
    config.hardship_deduction_minutes = round(float(request.form.get("hardship_hours") or 0) * 60)
    config.notes = request.form.get("notes") or None
    db.session.commit()
    flash("Objectif annuel et déduction de pénibilité enregistrés.", "success")
    return _redirect(year)


@planning_bp.route("/time/template", methods=["POST"])
@login_required
def save_time_template():
    count = WorkScheduleTemplate.query.filter_by(user_id=current_user.id, is_active=True).count()
    if count >= 6:
        flash("Vous pouvez définir au maximum six horaires types.", "warning")
        return _redirect()
    start, end = _time(request.form.get("start_time")), _time(request.form.get("end_time"))
    lunch_start, lunch_end = _time(request.form.get("lunch_start")), _time(request.form.get("lunch_end"))
    if not _valid_schedule(start, end, lunch_start, lunch_end):
        flash("Horaires invalides : la fin doit être après le début et la pause doit être complète et comprise dans la journée.", "danger")
        return _redirect()
    template = WorkScheduleTemplate(
        user_id=current_user.id, name=(request.form.get("name") or f"Horaire {count + 1}").strip(),
        start_time=start, end_time=end, lunch_start=lunch_start, lunch_end=lunch_end,
    )
    db.session.add(template)
    db.session.commit()
    flash("Horaire type ajouté.", "success")
    return _redirect()


@planning_bp.route("/time/template/<int:id>/delete", methods=["POST"])
@login_required
def delete_time_template(id):
    template = WorkScheduleTemplate.query.filter_by(id=id, user_id=current_user.id).first_or_404()
    template.is_active = False
    for assignment in template.assignments:
        assignment.template_id = None
    db.session.commit()
    flash("Horaire type désactivé.", "success")
    return _redirect()


@planning_bp.route("/time/template/<int:id>/edit", methods=["POST"])
@login_required
def edit_time_template(id):
    template = WorkScheduleTemplate.query.filter_by(id=id, user_id=current_user.id, is_active=True).first_or_404()
    start, end = _time(request.form.get("start_time")), _time(request.form.get("end_time"))
    lunch_start = _time(request.form.get("lunch_start"))
    lunch_end = _time(request.form.get("lunch_end")) or template.lunch_end
    if not _valid_schedule(start, end, lunch_start, lunch_end):
        flash("Horaires invalides : la fin doit être après le début et la pause doit être complète et comprise dans la journée.", "danger")
        return _redirect()
    template.name = (request.form.get("name") or template.name).strip()
    template.start_time, template.end_time = start, end
    template.lunch_start, template.lunch_end = lunch_start, lunch_end
    for assignment in template.assignments:
        assignment.start_time, assignment.end_time = start, end
        assignment.lunch_start, assignment.lunch_end = lunch_start, lunch_end
    db.session.commit()
    flash("Horaire type modifié.", "success")
    return _redirect()


@planning_bp.route("/time/assignment", methods=["POST"])
@login_required
def assign_time_template():
    day = request.form.get("day_of_week", type=int)
    template_id = request.form.get("template_id", type=int)
    assignment = WorkSchedule.query.filter_by(user_id=current_user.id, day_of_week=day).first()
    if not template_id:
        if assignment:
            db.session.delete(assignment)
    else:
        template = WorkScheduleTemplate.query.filter_by(id=template_id, user_id=current_user.id, is_active=True).first_or_404()
        if not assignment:
            assignment = WorkSchedule(user_id=current_user.id, day_of_week=day)
            db.session.add(assignment)
        assignment.template_id = template.id
        assignment.start_time, assignment.end_time = template.start_time, template.end_time
        assignment.lunch_start, assignment.lunch_end = template.lunch_start, template.lunch_end
        assignment.is_active = True
    db.session.commit()
    return _redirect()


@planning_bp.route("/time/entry", methods=["POST"])
@login_required
def save_time_entry():
    work_date = datetime.strptime(request.form["work_date"], "%Y-%m-%d").date()
    entry = TimeEntry.query.filter_by(user_id=current_user.id, work_date=work_date).first()
    if not entry:
        entry = TimeEntry(user_id=current_user.id, work_date=work_date)
        db.session.add(entry)
    entry.planned_minutes = int(request.form.get("planned_minutes") or 0)
    entry.actual_minutes = int(request.form.get("actual_minutes") or 0)
    entry.entry_type = request.form.get("entry_type") or "travail"
    entry.note = request.form.get("note") or None
    db.session.commit()
    flash("Suivi de la journée enregistré.", "success")
    return _redirect(work_date.year)


@planning_bp.route("/time/import-vacations", methods=["POST"])
@login_required
def import_school_vacations():
    from app_new.lib_ext.vacances_scolaires import import_vacances_scolaires
    year = request.form.get("year", date.today().year, type=int)
    added, ignored, errors = import_vacances_scolaires(request.form.get("zone", "C"), year, current_user.id)
    flash(f"Vacances importées : {added} ajoutée(s), {ignored} déjà présente(s)." + (f" {len(errors)} erreur(s)." if errors else ""), "warning" if errors else "success")
    return _redirect(year)


@planning_bp.route("/time/import-holidays", methods=["POST"])
@login_required
def import_public_holidays():
    from app_new.lib_ext.vacances_scolaires import import_jours_feries
    year = request.form.get("year", date.today().year, type=int)
    added, ignored = import_jours_feries(year, current_user.id)
    flash(f"Jours fériés importés : {added} ajouté(s), {ignored} déjà présent(s).", "success")
    return _redirect(year)


@planning_bp.route("/time/permanences", methods=["POST"])
@login_required
def save_permanences():
    year = request.form.get("year", date.today().year, type=int)
    template = WorkScheduleTemplate.query.filter_by(id=request.form.get("template_id", type=int), user_id=current_user.id, is_active=True).first_or_404()
    selected_dates = set(request.form.getlist("work_dates"))
    period_start, period_end = _period(year)
    closures = CollegeClosure.query.filter(
        CollegeClosure.end_date >= period_start, CollegeClosure.start_date <= period_end,
        CollegeClosure.closure_type.in_(["vacances", "vacances_scolaires"]),
    ).all()
    for closure in closures:
        current_day = max(closure.start_date, period_start)
        end_day = min(closure.end_date, period_end)
        while current_day <= end_day:
            if current_day.weekday() < 5 and current_day.isoformat() in selected_dates:
                day = ClosureWorkDay.query.filter_by(closure_id=closure.id, work_date=current_day).first()
                if not day:
                    day = ClosureWorkDay(closure_id=closure.id, work_date=current_day)
                    db.session.add(day)
                day.template_id = template.id
                day.start_time, day.end_time = template.start_time, template.end_time
                day.lunch_start, day.lunch_end = template.lunch_start, template.lunch_end
                day.notes = "Permanence"
                closure.work_hours_type = "custom"
            current_day += timedelta(days=1)
    db.session.commit()
    flash(f"{len(selected_dates)} jour(s) de permanence enregistré(s) avec « {template.name} ».", "success")
    return _redirect(year)


@planning_bp.route("/time/permanence/<int:id>/delete", methods=["POST"])
@login_required
def delete_permanence(id):
    day = ClosureWorkDay.query.get_or_404(id)
    year = day.work_date.year
    db.session.delete(day)
    db.session.commit()
    flash("Permanence supprimée.", "success")
    return _redirect(year)