from flask import Blueprint, render_template, request, redirect, url_for, flash, jsonify
from datetime import date, datetime
from modules.tasks.task_handler import TaskHandler
from modules.tasks.task import Task
from modules.email.draft_handler import DraftHandler
from modules.email.email_manager import EmailSender
from jobs.daily_reminder_job import main as generate_email_drafts_today
from html import escape

tasks_bp = Blueprint("tasks", __name__, url_prefix="/tasks")


@tasks_bp.get("/")
def tasks_index():
    """
    Page de gestion des tâches: liste + formulaire de création.
    Filtres optionnels via query string: status, entity_type, entity_id
    """
    handler = TaskHandler()
    status = request.args.get("status")
    entity_type = request.args.get("entity_type")
    entity_id = request.args.get("entity_id")

    tasks = handler.list_tasks(status=status) if status else handler.list_tasks()
    if entity_type and entity_id:
        tasks = [t for t in tasks if t.entity_type == entity_type and t.entity_id == entity_id]

    return render_template(
        "tasks/manage.html",
        tasks=tasks,
        status=status,
        entity_type=entity_type,
        entity_id=entity_id,
        today=date.today().isoformat(),
    )


@tasks_bp.get("/today/fragment")
def today_fragment():
    """
    Renvoie le fragment HTML du bloc 'tâches du jour'
    """
    handler = TaskHandler()
    today_tasks = handler.list_today_tasks(status="todo")
    return render_template("partials/tasks_today_block.html", today_tasks=today_tasks)

@tasks_bp.get('/tomorrow/fragment')
def tomorrow_fragment():
    """
    Renvoie le fragment HTML du bloc 'tâches du lendemain'
    """
    handler = TaskHandler()
    tomorrow_tasks = handler.list_tomorrow_tasks(status="todo")
    return render_template("partials/tasks_today_block.html", today_tasks=tomorrow_tasks)

@tasks_bp.get("/today/count")
def today_count():
    """
    Renvoie le nombre de tâches du jour (todo) au format JSON, pour affichage dans un badge.
    """
    handler = TaskHandler()
    count = len(handler.list_today_tasks(status="todo"))
    return jsonify({"count": count})


@tasks_bp.post("/create")
def create_task():
    """
    Création d'une tâche depuis un formulaire.
    Champs attendus: title, due_date (YYYY-MM-DD), description, priority, entity_type, entity_id
    """
    title = (request.form.get("title") or "").strip()
    due_date = (request.form.get("due_date") or "").strip()
    description = (request.form.get("description") or "").strip()
    priority = (request.form.get("priority") or "normale").strip()
    entity_type = (request.form.get("entity_type") or "").strip() or None
    entity_id = (request.form.get("entity_id") or "").strip() or None

    if not title or not due_date:
        flash("Titre et échéance sont obligatoires.", "warning")
        return redirect(request.referrer or url_for("tasks.tasks_index"))

    handler = TaskHandler()
    task = Task(
        title=title,
        due_date=due_date,
        description=description,
        priority=priority,
        entity_type=entity_type,
        entity_id=entity_id,
    )
    handler.add_task(task)
    flash("Tâche créée avec succès.", "success")
    return redirect(request.referrer or url_for("tasks.tasks_index"))


@tasks_bp.post("/status")
def set_status():
    """
    Met à jour le statut d'une tâche (todo|done|canceled).
    Form data: task_id, status
    """
    task_id = (request.form.get("task_id") or "").strip()
    status = (request.form.get("status") or "todo").strip()
    if not task_id or status not in ("todo", "done", "canceled"):
        flash("Requête invalide pour le changement de statut.", "warning")
        return redirect(request.referrer or url_for("tasks.tasks_index"))

    handler = TaskHandler()
    task = handler.get_task(task_id)
    if not task:
        flash("Tâche introuvable.", "danger")
        return redirect(request.referrer or url_for("tasks.tasks_index"))

    task.status = status
    task.completed_at = datetime.utcnow().isoformat() if status == "done" else None
    if handler.update_task(task):
        flash("Statut de la tâche mis à jour.", "success")
    else:
        flash("Échec de la mise à jour du statut.", "danger")
    return redirect(request.referrer or url_for("tasks.tasks_index"))


@tasks_bp.post("/delete")
def delete_task():
    """
    Supprime une tâche.
    Form data: task_id
    """
    task_id = (request.form.get("task_id") or "").strip()
    if not task_id:
        flash("Requête invalide pour la suppression.", "warning")
        return redirect(request.referrer or url_for("tasks.tasks_index"))

    handler = TaskHandler()
    if handler.delete_task(task_id):
        flash("Tâche supprimée.", "success")
    else:
        flash("Échec de la suppression.", "danger")
    return redirect(request.referrer or url_for("tasks.tasks_index"))


@tasks_bp.post("/update")
def update_task():
    """
    Met à jour les champs d'une tâche.
    Form data: task_id, title, due_date, description, priority, entity_type, entity_id
    """
    task_id = (request.form.get("task_id") or "").strip()
    if not task_id:
        flash("Requête invalide pour l'édition.", "warning")
        return redirect(request.referrer or url_for("tasks.tasks_index"))

    handler = TaskHandler()
    task = handler.get_task(task_id)
    if not task:
        flash("Tâche introuvable.", "danger")
        return redirect(request.referrer or url_for("tasks.tasks_index"))

    # Mise à jour des champs
    task.title = (request.form.get("title") or task.title).strip()
    task.due_date = (request.form.get("due_date") or task.due_date).strip()
    task.description = (request.form.get("description") or task.description).strip()
    task.priority = (request.form.get("priority") or task.priority).strip()
    task.entity_type = (request.form.get("entity_type") or task.entity_type or "").strip() or None
    task.entity_id = (request.form.get("entity_id") or task.entity_id or "").strip() or None

    if handler.update_task(task):
        flash("Tâche modifiée.", "success")
    else:
        flash("Échec de la modification.", "danger")
    return redirect(request.referrer or url_for("tasks.tasks_index"))


@tasks_bp.get("/email-drafts")
def email_drafts_list():
    """
    Liste des brouillons d'emails à envoyer + actions UI (via template).
    """
    dh = DraftHandler()
    drafts = dh.list_pending()
    return render_template("tasks/email_drafts.html", drafts=drafts)


@tasks_bp.post("/email-drafts/generate")
def email_drafts_generate():
    """
    Déclenche la génération des brouillons d'aujourd'hui (équivalent au job quotidien).
    """
    try:
        count = generate_email_drafts_today()
        if count:
            flash(f"{count} brouillon(s) généré(s) pour aujourd'hui.", "success")
        else:
            flash("Aucun brouillon créé. Vérifiez: tâches 'todo' dues aujourd'hui, liées à des prospects avec un email.", "info")
    except Exception as e:
        flash(f"Erreur lors de la génération: {e}", "danger")
    return redirect(url_for("tasks.email_drafts_list"))


@tasks_bp.post("/email-drafts/send")
def email_drafts_send():
    """
    Envoie un brouillon d'email sélectionné puis met à jour son statut.
    """
    draft_id = (request.form.get("draft_id") or "").strip()
    if not draft_id:
        flash("Brouillon invalide", "warning")
        return redirect(url_for("tasks.email_drafts_list"))

    dh = DraftHandler()
    draft = dh.get_draft(draft_id)
    if not draft:
        flash("Brouillon introuvable", "danger")
        return redirect(url_for("tasks.email_drafts_list"))

    sender = EmailSender()
    try:
        res = sender.send_tracked_email(
            to_email=draft.to_email,
            subject=draft.subject,
            body=draft.content,
            prospect_id=draft.prospect_id,
            template_id=draft.template_id,
        )
        if res.get("success"):
            dh.mark_sent(draft.id, success=True)
            flash("Email envoyé.", "success")
        else:
            dh.mark_sent(draft.id, success=False, error_message=res.get("error"))
            flash("Échec de l'envoi de l'email.", "danger")
    except Exception as e:
        dh.mark_sent(draft.id, success=False, error_message=str(e))
        flash("Erreur lors de l'envoi de l'email.", "danger")

    return redirect(url_for("tasks.email_drafts_list"))


@tasks_bp.get("/quick-add")
def quick_add_page():
    """
    Page complète 'Quick Add Task' pour une entité donnée.
    Paramètres query: entity_type (client|prospect|project), entity_id
    """
    entity_type = (request.args.get("entity_type") or "").strip()
    entity_id = (request.args.get("entity_id") or "").strip()
    if not entity_type or not entity_id:
        flash("Paramètres manquants pour lier la tâche à une entité.", "warning")
        return redirect(url_for("tasks.tasks_index"))

    return render_template(
        "tasks/quick_add.html",
        entity_type=entity_type,
        entity_id=entity_id,
        today=date.today().isoformat(),
    )


@tasks_bp.get("/quick-add/fragment")
def quick_add_fragment():
    """
    Fragment HTML du formulaire 'Quick Add Task' intégré dans d'autres pages.
    Paramètres query: entity_type, entity_id
    """
    entity_type = (request.args.get("entity_type") or "").strip()
    entity_id = (request.args.get("entity_id") or "").strip()
    if not entity_type or not entity_id:
        return "<p class='text-warning'>Paramètres manquants pour le formulaire de tâche liée.</p>"

    return render_template(
        "partials/task_quick_add_form.html",
        entity_type=entity_type,
        entity_id=entity_id,
        today=date.today().isoformat(),
    )