# -*- coding: utf-8 -*-
from flask import Blueprint, render_template, request, redirect, url_for, flash, send_file, current_app, jsonify, abort
from flask_login import login_required, current_user
from datetime import datetime, timedelta
from utils.timezone import taiwan_now, format_taiwan_time
from models import TempSpec, db, Upload, SpecHistory
from utils import editor_or_admin_required, add_history_log, admin_required, send_email, process_recipients
import os
import shutil
import jwt
import requests
from werkzeug.utils import secure_filename
from docxtpl import DocxTemplate

temp_spec_bp = Blueprint('temp_spec', __name__)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

# Enforce authentication for this blueprint (except OnlyOffice callback)
@temp_spec_bp.before_request
def before_request():
    """Ensure every request under this blueprint comes from an authenticated user."""
    # Allow OnlyOffice callback without authentication
    if request.endpoint == 'temp_spec.onlyoffice_callback':
        return None
    if not current_user.is_authenticated:
        return redirect(url_for('auth.login'))

def _generate_next_spec_code():
    """Generate the next temporary spec code based on ROC year/month and a sequence."""
    now = taiwan_now()
    roc_year = now.year - 1911
    prefix = f"PE{roc_year}{now.strftime('%m')}"

    latest_spec = TempSpec.query.filter(
        TempSpec.spec_code.startswith(prefix)
    ).order_by(TempSpec.spec_code.desc()).first()

    if latest_spec:
        last_seq = int(latest_spec.spec_code[-2:])
        new_seq = last_seq + 1
    else:
        new_seq = 1
    
    return f"{prefix}{new_seq:02d}"

def get_file_uri(filename: str) -> str:
    """Return a public URL for a generated file stored under /static/generated."""
    return url_for('static', filename=f"generated/{filename}", _external=True)


@temp_spec_bp.route('/create', methods=['GET', 'POST'])
@editor_or_admin_required
def create_temp_spec():
    if request.method == 'POST':
        spec_code = _generate_next_spec_code()
        form_data = request.form
        now = taiwan_now()
        
        spec = TempSpec(
            spec_code=spec_code,
            title=form_data['theme'],
            applicant=form_data['applicant'],
            status='pending_approval',
            created_at=now,
            start_date=now.date(),
            end_date=(now + timedelta(days=30)).date()
        )
        db.session.add(spec)
        db.session.flush()

        context = {
            'serial_number': spec_code,
            'theme': form_data.get('theme', ''),
            'package': form_data.get('package', ''),
            'lot_number': form_data.get('lot_number', ''),
            'equipment_type': form_data.get('equipment_type', ''),
            'applicant': form_data.get('applicant', ''),
            'applicant_phone': form_data.get('applicant_phone', ''),
            'start_date': now.strftime('%Y-%m-%d'),
            'end_date': (now + timedelta(days=30)).strftime('%Y-%m-%d'),
        }

        selected_stations = request.form.getlist('station')
        station_keys = ['probing', 'dicing', 'diebond', 'wirebond', 'solder', 'molding', 
                        'degate', 'deflash', 'plating', 'trimform', 'marking', 'tmtt', 'other']
        for key in station_keys:
            context[f's_{key}'] = 'Y' if key in selected_stations else 'N'

        selected_tccs_level = form_data.get('tccs_level')
        level_keys = ['l1', 'l2', 'l3', 'l4']
        for key in level_keys:
            context[f't_{key}'] = 'Y' if key == selected_tccs_level else 'N'

        selected_tccs_4m = form_data.get('tccs_4m')
        m_keys = ['man', 'machine', 'material', 'method', 'env']
        for key in m_keys:
            context[f't_{key}'] = 'Y' if key == selected_tccs_4m else 'N'
        
        generated_folder = os.path.join(current_app.static_folder, 'generated')
        os.makedirs(generated_folder, exist_ok=True)
        template_path = os.path.join(BASE_DIR, 'template_with_placeholders.docx')
        new_file_path = os.path.join(generated_folder, f"{spec_code}.docx")

        if not os.path.exists(template_path):
             flash('Word template (template_with_placeholders.docx) was not found.', 'danger')
             db.session.rollback()
             return redirect(url_for('temp_spec.spec_list'))
        
        doc = DocxTemplate(template_path)
        doc.render(context)
        doc.save(new_file_path)

        add_history_log(spec.id, 'create', f"Created draft spec: {spec.spec_code}")
        db.session.commit()
        
        return redirect(url_for('temp_spec.edit_spec', spec_id=spec.id))

    return render_template('create_temp_spec_form.html')

@temp_spec_bp.route('/edit/<int:spec_id>')
@editor_or_admin_required
def edit_spec(spec_id):
    spec = TempSpec.query.get_or_404(spec_id)
    doc_filename = f"{spec.spec_code}.docx"
    
    doc_physical_path = os.path.join(current_app.static_folder, 'generated', doc_filename)
    if not os.path.exists(doc_physical_path):
        flash(f"Generated document not found: {doc_filename}", 'danger')
        return redirect(url_for('temp_spec.spec_list'))


    doc_url = get_file_uri(doc_filename)
    callback_url = url_for('temp_spec.onlyoffice_callback', spec_id=spec_id, _external=True)
    
    if '127.0.0.1' in doc_url or 'localhost' in doc_url:
        doc_url = doc_url.replace('127.0.0.1:12013', 'panjit-tempspec-nginx:80').replace('localhost:12013', 'panjit-tempspec-nginx:80')
        doc_url = doc_url.replace('127.0.0.1', 'panjit-tempspec-nginx').replace('localhost', 'panjit-tempspec-nginx')
        callback_url = callback_url.replace('127.0.0.1:12013', 'panjit-tempspec-nginx:80').replace('localhost:12013', 'panjit-tempspec-nginx:80')
        callback_url = callback_url.replace('127.0.0.1', 'panjit-tempspec-nginx').replace('localhost', 'panjit-tempspec-nginx')
        

    oo_secret = current_app.config['ONLYOFFICE_JWT_SECRET']

    file_key = f"{spec.id}_{int(os.path.getmtime(doc_physical_path))}"

    payload = {
        "document": {
            "fileType": "docx",
            "key": file_key,
            "title": doc_filename,
            "url": doc_url
        },
        "documentType": "word",
        "editorConfig": {
            "callbackUrl": callback_url,
            "user": { "id": str(current_user.id), "name": current_user.name or current_user.username },
            "customization": {
                "autosave": True,
                "forcesave": True,
                "chat": False,
                "comments": True,
                "help": False
            },
            "mode": "edit"
        }
    }

    token = jwt.encode(payload, oo_secret, algorithm='HS256')
    
    config = payload.copy()
    config['token'] = token

    return render_template(
        'onlyoffice_editor.html', 
        spec=spec,
        config=config,
        onlyoffice_url=current_app.config['ONLYOFFICE_URL']
    )

@temp_spec_bp.route('/onlyoffice-callback/<int:spec_id>', methods=['POST'])
def onlyoffice_callback(spec_id):
    data = request.json
    status = data.get('status')

    current_app.logger.info(f"OnlyOffice callback for spec {spec_id}: status={status}, data={data}")


    if status in [2, 6]:
        try:
            if 'url' not in data:
                current_app.logger.error(f"OnlyOffice callback missing URL for spec {spec_id}")
                return jsonify({"error": 1, "message": "Missing document URL"})

            token = data.get('token')
            if token:
                try:
                    oo_secret = current_app.config['ONLYOFFICE_JWT_SECRET']
                    jwt.decode(token, oo_secret, algorithms=['HS256'])
                except jwt.InvalidTokenError:
                    current_app.logger.error(f"Invalid JWT token in OnlyOffice callback for spec {spec_id}")
                    return jsonify({"error": 1, "message": "Invalid token"})

            download_url = data['url']
            download_url = download_url.replace('localhost:12015', 'panjit-tempspec-onlyoffice:80')
            download_url = download_url.replace('127.0.0.1:12015', 'panjit-tempspec-onlyoffice:80')

            current_app.logger.info(f"Downloading updated document from: {data['url']} -> {download_url}")
            response = requests.get(download_url, timeout=30)
            response.raise_for_status()

            spec = TempSpec.query.get_or_404(spec_id)
            doc_filename = f"{spec.spec_code}.docx"
            file_path = os.path.join(current_app.static_folder, 'generated', doc_filename)

            os.makedirs(os.path.dirname(file_path), exist_ok=True)

            with open(file_path, 'wb') as f:
                f.write(response.content)

            current_app.logger.info(f"Successfully saved updated document for spec {spec_id} to {file_path}")

            spec.updated_at = taiwan_now()
            db.session.commit()

        except requests.RequestException as e:
            current_app.logger.error(f"Failed to download document from OnlyOffice for spec {spec_id}: {e}")
            return jsonify({"error": 1, "message": f"Download failed: {str(e)}"})
        except Exception as e:
            current_app.logger.error(f"OnlyOffice callback error for spec {spec_id}: {e}")
            return jsonify({"error": 1, "message": str(e)})

    elif status == 1:
        current_app.logger.info(f"Document {spec_id} is being edited")
    elif status == 4:
        current_app.logger.info(f"Document {spec_id} closed without changes")
    elif status == 7:
        current_app.logger.error(f"OnlyOffice error for document {spec_id}")
        return jsonify({"error": 1, "message": "OnlyOffice reported an error"})

    return jsonify({"error": 0})


@temp_spec_bp.route('/list')
@login_required
def spec_list():
    page = request.args.get('page', 1, type=int)
    query = request.args.get('query', '')
    status_filter = request.args.get('status', '')
    specs_query = TempSpec.query

    if query:
        search_term = f"%{query}%"
        specs_query = specs_query.filter(
            db.or_(
                TempSpec.spec_code.ilike(search_term),
                TempSpec.title.ilike(search_term)
            )
        )
    
    if status_filter:
        specs_query = specs_query.filter(TempSpec.status == status_filter)

    pagination = specs_query.order_by(TempSpec.created_at.desc()).paginate(
        page=page, per_page=15, error_out=False
    )
    
    specs = pagination.items
    from datetime import date
    today = date.today()

    return render_template(
        'spec_list.html', 
        specs=specs, 
        pagination=pagination, 
        query=query, 
        status=status_filter,
        today=today
    )

@temp_spec_bp.route('/activate/<int:spec_id>', methods=['GET', 'POST'])
@admin_required
def activate_spec(spec_id):
    spec = TempSpec.query.get_or_404(spec_id)
    if request.method == 'POST':
        uploaded_file = request.files.get('signed_file')
        if not uploaded_file or uploaded_file.filename == '':
            flash('Please upload a file first.', 'danger')
            return redirect(url_for('temp_spec.activate_spec', spec_id=spec.id))

        filename = secure_filename(f"{spec.spec_code}_signed_{taiwan_now().strftime('%Y%m%d%H%M%S')}.pdf")
        upload_folder = os.path.join(BASE_DIR, current_app.config['UPLOAD_FOLDER'])
        os.makedirs(upload_folder, exist_ok=True)
        file_path = os.path.join(upload_folder, filename)
        uploaded_file.save(file_path)

        new_upload = Upload(
            temp_spec_id=spec.id,
            filename=filename,
            upload_time=taiwan_now()
        )
        db.session.add(new_upload)

        spec.status = 'active'
        
        recipients_str = request.form.get('recipients')
        if recipients_str:
            spec.notification_emails = recipients_str.strip()
        
        add_history_log(spec.id, 'activate', f"Uploaded signed file '{filename}'")
        db.session.commit()
        flash(f"Spec '{spec.spec_code}' is now active.", 'success')

        # --- Start of Dynamic Email Notification ---
        if recipients_str:
            recipients = process_recipients(recipients_str)
            if recipients:
                subject = f"[TempSpec Notice] Spec '{spec.spec_code}' is active"
                # Using f-strings and triple quotes for a readable HTML body
                body = f"""
                <html>
                <body>
                    <p>Hello,</p>
                    <p>Temp spec <b>{spec.spec_code} - {spec.title}</b> has been approved and is now active.</p>
                    <p>Start date: {spec.start_date.strftime('%Y-%m-%d')}<br>
                       End date: {spec.end_date.strftime('%Y-%m-%d')}</p>
                    <p>Applicant: {spec.applicant}</p>
                    <p>Please sign in to the system for additional details.</p>
                    <p>This notification was sent automatically. Please do not reply.</p>
                </body>
                </html>
                """
                send_email(recipients, subject, body)
                current_app.logger.info(f"Sent activation notification for spec {spec.spec_code} to {len(recipients)} recipients.")
        # --- End of Dynamic Email Notification ---
        return redirect(url_for('temp_spec.spec_list'))

    return render_template('activate_spec.html', spec=spec)

@temp_spec_bp.route('/terminate/<int:spec_id>', methods=['GET', 'POST'])
@editor_or_admin_required
def terminate_spec(spec_id):
    spec = TempSpec.query.get_or_404(spec_id)
    if request.method == 'POST':
        reason = request.form.get('reason')
        if not reason:
            flash('Please provide the reason for early termination.', 'danger')
            return redirect(url_for('temp_spec.terminate_spec', spec_id=spec.id))
        
        spec.status = 'terminated'
        spec.termination_reason = reason
        spec.end_date = taiwan_now().date()
        add_history_log(spec.id, 'terminate', f"Reason: {reason}")
        
        # --- Start of Dynamic Email Notification ---
        recipients_str = request.form.get('recipients')
        if not recipients_str and spec.notification_emails:
            recipients_str = spec.notification_emails
        if recipients_str:
            recipients = process_recipients(recipients_str)
            if recipients:
                subject = f"[TempSpec Notice] Spec '{spec.spec_code}' was terminated early"
                body = f"""
                <html>
                <body>
                    <p>Hello,</p>
                    <p>Temp spec <b>{spec.spec_code} - {spec.title}</b> has been terminated.</p>
                    <p>Termination date: <b>{spec.end_date.strftime('%Y-%m-%d')}</b></p>
                    <p>Applicant: {spec.applicant}</p>
                    <p>Reason: {reason}</p>
                    <p>Please sign in to the system for additional details.</p>
                    <p>This notification was sent automatically. Please do not reply.</p>
                </body>
                </html>
                """
                send_email(recipients, subject, body)
                current_app.logger.info(f"Sent termination notification for spec {spec.spec_code} to {len(recipients)} recipients.")
        # --- End of Dynamic Email Notification ---
        
        db.session.commit()
        flash(f"Spec '{spec.spec_code}' has been terminated early.", 'warning')
        return redirect(url_for('temp_spec.spec_list'))

    return render_template('terminate_spec.html', spec=spec, saved_emails=spec.notification_emails)

@temp_spec_bp.route('/download_initial_word/<int:spec_id>')
@login_required
def download_initial_word(spec_id):
    spec = TempSpec.query.get_or_404(spec_id)
    if current_user.role not in ['editor', 'admin']:
        flash('You do not have permission to download the Word document.', 'danger')
        abort(403)

    generated_folder = os.path.join(current_app.static_folder, 'generated')
    word_path = os.path.join(generated_folder, f"{spec.spec_code}.docx")

    if not os.path.exists(word_path):
        flash('The original Word document cannot be found. It might have been moved or deleted.', 'danger')
        return redirect(url_for('temp_spec.spec_list'))

    return send_file(word_path, as_attachment=True)

@temp_spec_bp.route('/download_signed/<int:spec_id>')
@login_required
def download_signed_pdf(spec_id):
    latest_upload = Upload.query.filter_by(temp_spec_id=spec_id).order_by(Upload.upload_time.desc()).first()

    if not latest_upload:
        flash('No signed files have been uploaded yet.', 'danger')
        return redirect(url_for('temp_spec.spec_list'))

    upload_folder = os.path.join(BASE_DIR, current_app.config['UPLOAD_FOLDER'])
    return send_file(os.path.join(upload_folder, latest_upload.filename), as_attachment=True)

@temp_spec_bp.route('/extend/<int:spec_id>', methods=['GET', 'POST'])
@editor_or_admin_required
def extend_spec(spec_id):
    spec = TempSpec.query.get_or_404(spec_id)

    if spec.extension_count >= 2:
        flash('This temporary specification has reached the extension limit (2 times) and the total 90-day duration. Extension is no longer allowed.', 'danger')
        return redirect(url_for('temp_spec.spec_list'))

    if request.method == 'POST':
        new_end_date_str = request.form.get('new_end_date')
        uploaded_file = request.files.get('new_file')

        if not uploaded_file or uploaded_file.filename == '':
            flash('Please upload the supporting PDF before extending.', 'danger')
            return redirect(url_for('temp_spec.extend_spec', spec_id=spec.id))
        
        if not new_end_date_str:
            flash('Please choose a new end date.', 'danger')
            return redirect(url_for('temp_spec.extend_spec', spec_id=spec.id))

        spec.end_date = datetime.strptime(new_end_date_str, '%Y-%m-%d').date()
        spec.extension_count += 1
        spec.status = 'active'

        filename = secure_filename(f"{spec.spec_code}_extension_{spec.extension_count}_{taiwan_now().strftime('%Y%m%d')}.pdf")
        upload_folder = os.path.join(BASE_DIR, current_app.config['UPLOAD_FOLDER'])
        os.makedirs(upload_folder, exist_ok=True)
        file_path = os.path.join(upload_folder, filename)
        uploaded_file.save(file_path)

        new_upload = Upload(
            temp_spec_id=spec.id,
            filename=filename,
            upload_time=taiwan_now()
        )
        db.session.add(new_upload)
        
        details = f"Extended end date to {spec.end_date.strftime('%Y-%m-%d')}"
        details += f", uploaded file '{new_upload.filename}'"
        add_history_log(spec.id, 'extend', details)
        
        # --- Start of Dynamic Email Notification ---
        recipients_str = request.form.get('recipients')
        if not recipients_str and spec.notification_emails:
            recipients_str = spec.notification_emails
        
        if recipients_str:
            spec.notification_emails = recipients_str.strip()
        if recipients_str:
            recipients = process_recipients(recipients_str)
            if recipients:
                subject = f"[TempSpec Notice] Spec '{spec.spec_code}' was extended"
                body = f"""
                <html>
                <body>
                    <p>Hello,</p>
                    <p>Temp spec <b>{spec.spec_code} - {spec.title}</b> has been extended.</p>
                    <p>New end date: <b>{spec.end_date.strftime('%Y-%m-%d')}</b></p>
                    <p>Applicant: {spec.applicant}</p>
                    <p>Please sign in to the system for additional details.</p>
                    <p>This notification was sent automatically. Please do not reply.</p>
                </body>
                </html>
                """
                send_email(recipients, subject, body)
                current_app.logger.info(f"Sent extension notification for spec {spec.spec_code} to {len(recipients)} recipients.")
        # --- End of Dynamic Email Notification ---
        
        db.session.commit()
        flash(f"Spec '{spec.spec_code}' was extended successfully.", 'success')
        return redirect(url_for('temp_spec.spec_list'))

    default_new_end_date = spec.end_date + timedelta(days=30)
    return render_template('extend_spec.html', spec=spec, default_new_end_date=default_new_end_date, saved_emails=spec.notification_emails)

@temp_spec_bp.route('/history/<int:spec_id>')
@login_required
def spec_history(spec_id):
    spec = TempSpec.query.get_or_404(spec_id)
    history = SpecHistory.query.filter_by(spec_id=spec_id).order_by(SpecHistory.timestamp.desc()).all()
    return render_template('spec_history.html', spec=spec, history=history)

@temp_spec_bp.route('/delete/<int:spec_id>', methods=['POST'])
@admin_required
def delete_spec(spec_id):
    spec = TempSpec.query.get_or_404(spec_id)
    spec_code = spec.spec_code

    files_to_delete = []
    generated_folder = os.path.join(current_app.static_folder, 'generated')
    files_to_delete.append(os.path.join(generated_folder, f"{spec.spec_code}.docx"))
    
    upload_folder = os.path.join(BASE_DIR, current_app.config['UPLOAD_FOLDER'])
    for upload_record in spec.uploads:
        files_to_delete.append(os.path.join(upload_folder, upload_record.filename))

    for f_path in files_to_delete:
        try:
            if os.path.exists(f_path):
                os.remove(f_path)
        except Exception as e:
            current_app.logger.error(f"Failed to delete file: {f_path}, reason: {e}")

    db.session.delete(spec)
    db.session.commit()

    flash(f"Spec '{spec_code}' and related files were deleted successfully.", 'success')
    return redirect(url_for('temp_spec.spec_list'))