feat: Finalisation formulaire dynamique

Back-End/Subscriptions/util.py

@@ -8,18 +8,22 @@ from N3wtSchool import renderers
 from N3wtSchool import bdd
 
 from io import BytesIO
+import base64
 from reportlab.pdfgen import canvas
 from reportlab.lib.pagesizes import A4
+from reportlab.lib.utils import ImageReader
+from reportlab.graphics import renderPDF
 from django.core.files.base import ContentFile
 from django.core.files import File
 from pathlib import Path
 import os
 from enum import Enum
+from urllib.parse import unquote_to_bytes
 
 import random
 import string
 from rest_framework.parsers import JSONParser
-from PyPDF2 import PdfMerger, PdfReader
+from PyPDF2 import PdfMerger, PdfReader, PdfWriter
 from PyPDF2.errors import PdfReadError
 
 import shutil
@@ -29,9 +33,79 @@ import json
 from django.http import QueryDict
 from rest_framework.response import Response
 from rest_framework import status
+from svglib.svglib import svg2rlg
 
 logger = logging.getLogger(__name__)
 
+
+def _draw_signature_data_url(cnv, data_url, x, y, width, height):
+    """
+    Dessine une signature issue d'un data URL dans un canvas ReportLab.
+    Supporte les images raster (PNG/JPEG/...) et SVG.
+    Retourne True si la signature a pu etre dessinee.
+    """
+    if not isinstance(data_url, str) or not data_url.startswith("data:image"):
+        return False
+
+    try:
+        header, payload = data_url.split(',', 1)
+    except ValueError:
+        return False
+
+    is_base64 = ';base64' in header
+    mime_type = header.split(':', 1)[1].split(';', 1)[0] if ':' in header else ''
+
+    try:
+        raw_bytes = base64.b64decode(payload) if is_base64 else unquote_to_bytes(payload)
+    except Exception as e:
+        logger.error(f"[_draw_signature_data_url] Decodage impossible: {e}")
+        return False
+
+    # Support SVG via svglib (deja present dans requirements)
+    if mime_type == 'image/svg+xml':
+        try:
+            drawing = svg2rlg(BytesIO(raw_bytes))
+            if drawing is None:
+                return False
+
+            src_w = float(getattr(drawing, 'width', 0) or 0)
+            src_h = float(getattr(drawing, 'height', 0) or 0)
+            if src_w <= 0 or src_h <= 0:
+                return False
+
+            scale = min(width / src_w, height / src_h)
+            draw_w = src_w * scale
+            draw_h = src_h * scale
+            offset_x = x + (width - draw_w) / 2
+            offset_y = y + (height - draw_h) / 2
+
+            cnv.saveState()
+            cnv.translate(offset_x, offset_y)
+            cnv.scale(scale, scale)
+            renderPDF.draw(drawing, cnv, 0, 0)
+            cnv.restoreState()
+            return True
+        except Exception as e:
+            logger.error(f"[_draw_signature_data_url] Rendu SVG impossible: {e}")
+            return False
+
+    # Support images raster classiques
+    try:
+        img_reader = ImageReader(BytesIO(raw_bytes))
+        cnv.drawImage(
+            img_reader,
+            x,
+            y,
+            width=width,
+            height=height,
+            preserveAspectRatio=True,
+            mask='auto',
+        )
+        return True
+    except Exception as e:
+        logger.error(f"[_draw_signature_data_url] Rendu raster impossible: {e}")
+        return False
+
 def save_file_replacing_existing(file_field, filename, content, save=True):
     """
     Sauvegarde un fichier en écrasant l'existant s'il porte le même nom.
@@ -55,6 +129,42 @@ def save_file_replacing_existing(file_field, filename, content, save=True):
     # Sauvegarder le nouveau fichier
     file_field.save(filename, content, save=save)
 
+def save_file_field_without_suffix(instance, field_name, filename, content, save=False):
+    """
+    Sauvegarde un fichier dans un FileField Django en ecrasant le precedent,
+    sans laisser Django generer de suffixe (_abc123).
+
+    Args:
+        instance: instance Django portant le FileField
+        field_name: nom du FileField (ex: 'file')
+        filename: nom de fichier cible (basename)
+        content: contenu fichier (ContentFile, File, etc.)
+        save: si True, persiste immediatement l'instance
+    """
+    file_field = getattr(instance, field_name)
+    field = instance._meta.get_field(field_name)
+    storage = file_field.storage
+
+    target_name = field.generate_filename(instance, filename)
+
+    # Supprimer le fichier actuellement reference si different
+    if file_field and file_field.name and file_field.name != target_name:
+        try:
+            if storage.exists(file_field.name):
+                storage.delete(file_field.name)
+        except Exception as e:
+            logger.error(f"[save_file_field_without_suffix] Erreur suppression ancien fichier ({file_field.name}): {e}")
+
+    # Supprimer explicitement la cible si elle existe deja
+    try:
+        if storage.exists(target_name):
+            storage.delete(target_name)
+    except Exception as e:
+        logger.error(f"[save_file_field_without_suffix] Erreur suppression cible ({target_name}): {e}")
+
+    # Sauvegarde: la cible n'existe plus, donc pas de suffixe
+    file_field.save(filename, content, save=save)
+
 def build_payload_from_request(request):
     """
     Normalise la request en payload prêt à être donné au serializer.
@@ -194,6 +304,91 @@ def create_templates_for_registration_form(register_form):
         base_slug = (m.name or "master").strip().replace(" ", "_")[:40]
         slug = f"{base_slug}_{register_form.pk}_{m.pk}"
 
+        is_dynamic_master = (
+            isinstance(m.formMasterData, dict)
+            and bool(m.formMasterData.get("fields"))
+        )
+
+        # Formulaire dynamique: toujours générer le PDF final depuis le JSON
+        # (aperçu admin) au lieu de copier le fichier source brut (PNG/PDF).
+        if is_dynamic_master:
+            base_pdf_content = None
+            base_file_ext = None
+            if m.file and hasattr(m.file, 'name') and m.file.name:
+                base_file_ext = os.path.splitext(m.file.name)[1].lower()
+                try:
+                    m.file.open('rb')
+                    base_pdf_content = m.file.read()
+                    m.file.close()
+                except Exception as e:
+                    logger.error(f"Erreur lecture fichier source master dynamique: {e}")
+
+            try:
+                generated_pdf = generate_form_json_pdf(
+                    register_form,
+                    m.formMasterData,
+                    base_pdf_content=base_pdf_content,
+                    base_file_ext=base_file_ext,
+                )
+            except Exception as e:
+                logger.error(f"Erreur génération PDF dynamique pour template: {e}")
+                generated_pdf = None
+
+            if tmpl:
+                try:
+                    if tmpl.file and tmpl.file.name:
+                        tmpl.file.delete(save=False)
+                except Exception:
+                    logger.exception("Erreur suppression ancien fichier template dynamique %s", getattr(tmpl, "pk", None))
+
+                tmpl.name = m.name or ""
+                tmpl.slug = slug
+                tmpl.formTemplateData = m.formMasterData or []
+                if generated_pdf is not None:
+                    output_filename = os.path.basename(generated_pdf.name)
+                    save_file_field_without_suffix(
+                        tmpl,
+                        'file',
+                        output_filename,
+                        generated_pdf,
+                        save=False,
+                    )
+                tmpl.save()
+                created.append(tmpl)
+                logger.info(
+                    "util.create_templates_for_registration_form - Regenerated dynamic school template %s from master %s for RF %s",
+                    tmpl.pk,
+                    m.pk,
+                    register_form.pk,
+                )
+                continue
+
+            tmpl = RegistrationSchoolFileTemplate(
+                master=m,
+                registration_form=register_form,
+                name=m.name or "",
+                formTemplateData=m.formMasterData or [],
+                slug=slug,
+            )
+            if generated_pdf is not None:
+                output_filename = os.path.basename(generated_pdf.name)
+                save_file_field_without_suffix(
+                    tmpl,
+                    'file',
+                    output_filename,
+                    generated_pdf,
+                    save=False,
+                )
+            tmpl.save()
+            created.append(tmpl)
+            logger.info(
+                "util.create_templates_for_registration_form - Created dynamic school template %s from master %s for RF %s",
+                tmpl.pk,
+                m.pk,
+                register_form.pk,
+            )
+            continue
+
         file_name = None
         if m.file and hasattr(m.file, 'name') and m.file.name:
             file_name = os.path.basename(m.file.name)
@@ -551,55 +746,196 @@ def getHistoricalYears(count=5):
 
     return historical_years
 
-def generate_form_json_pdf(register_form, form_json):
+def generate_form_json_pdf(register_form, form_json, base_pdf_content=None, base_file_ext=None, base_pdf_path=None):
     """
-    Génère un PDF du rendu du formulaire dynamique à partir du JSON (formConfig)
-    et l'associe au RegistrationSchoolFileTemplate.
-    Le PDF contient le titre, les labels et types de champs.
-    Retourne un ContentFile prêt à être utilisé dans un FileField, avec uniquement le nom du fichier.
+    Génère un PDF composite du formulaire dynamique:
+    - le document source uploadé (PDF/image) si présent,
+    - puis un rendu du formulaire (similaire à l'aperçu),
+    - avec overlay de signature(s) sur la dernière page du document source.
     """
 
-    # Récupérer le nom du formulaire
     form_name = (form_json.get("title") or "formulaire").strip().replace(" ", "_")
     filename = f"{form_name}.pdf"
+    fields = form_json.get("fields", []) if isinstance(form_json, dict) else []
 
-    # Générer le PDF
-    buffer = BytesIO()
-    c = canvas.Canvas(buffer, pagesize=A4)
-    y = 800
+    # Compatibilité ascendante : charger depuis un chemin si nécessaire
+    if base_pdf_content is None and base_pdf_path and os.path.exists(base_pdf_path):
+        base_file_ext = os.path.splitext(base_pdf_path)[1].lower()
+        try:
+            with open(base_pdf_path, 'rb') as f:
+                base_pdf_content = f.read()
+        except Exception as e:
+            logger.error(f"[generate_form_json_pdf] Lecture fichier source: {e}")
 
-    # Titre
-    c.setFont("Helvetica-Bold", 20)
-    c.drawString(100, y, form_json.get("title", "Formulaire"))
-    y -= 40
+    writer = PdfWriter()
+    has_source_document = False
+    source_is_image = False
+    source_image_reader = None
+    source_image_size = None
 
-    # Champs
-    c.setFont("Helvetica", 12)
-    fields = form_json.get("fields", [])
+    # 1) Charger le document source (PDF/image) si présent
+    if base_pdf_content:
+        try:
+            image_exts = {'.png', '.jpg', '.jpeg', '.gif', '.bmp', '.tiff', '.webp'}
+            ext = (base_file_ext or '').lower()
+
+            if ext in image_exts:
+                # Pour les images, on les rend dans la section [fichier uploade]
+                # au lieu de les ajouter comme page source separee.
+                img_buffer = BytesIO(base_pdf_content)
+                source_image_reader = ImageReader(img_buffer)
+                source_image_size = source_image_reader.getSize()
+                source_is_image = True
+            else:
+                source_reader = PdfReader(BytesIO(base_pdf_content))
+                for page in source_reader.pages:
+                    writer.add_page(page)
+                has_source_document = len(source_reader.pages) > 0
+        except Exception as e:
+            logger.error(f"[generate_form_json_pdf] Erreur chargement source: {e}")
+
+    # 2) Overlay des signatures sur la dernière page du document source
+    # Desactive ici pour eviter les doublons: la signature est rendue
+    # dans la section JSON du formulaire (et non plus en overlay source).
+    signatures = []
     for field in fields:
-        label = field.get("label", field.get("id", ""))
-        ftype = field.get("type", "")
-        value = field.get("value", "")
-        # Afficher la valeur si elle existe
-        if value not in (None, ""):
-            c.drawString(100, y, f"{label} [{ftype}] : {value}")
-        else:
-            c.drawString(100, y, f"{label} [{ftype}]")
-        y -= 25
-        if y < 100:
-            c.showPage()
-            y = 800
+        if field.get("type") == "signature":
+            value = field.get("value")
+            if isinstance(value, str) and value.startswith("data:image"):
+                signatures.append(value)
 
-    c.save()
-    buffer.seek(0)
-    pdf_content = buffer.read()
+    enable_source_signature_overlay = False
+    if signatures and len(writer.pages) > 0 and enable_source_signature_overlay:
+        try:
+            target_page = writer.pages[len(writer.pages) - 1]
+            page_width = float(target_page.mediabox.width)
+            page_height = float(target_page.mediabox.height)
 
-    # Si un fichier existe déjà sur le template, le supprimer (optionnel, à adapter selon usage)
-    if hasattr(register_form, "registration_file") and register_form.registration_file and register_form.registration_file.name:
-        existing_file_path = os.path.join(settings.MEDIA_ROOT, register_form.registration_file.name.lstrip('/'))
-        if os.path.exists(existing_file_path):
-            os.remove(existing_file_path)
-            register_form.registration_file.delete(save=False)
+            packet = BytesIO()
+            c_overlay = canvas.Canvas(packet, pagesize=(page_width, page_height))
 
-    # Retourner le ContentFile avec uniquement le nom du fichier
-    return ContentFile(pdf_content, name=os.path.basename(filename))
+            sig_width = 170
+            sig_height = 70
+            margin = 36
+            spacing = 10
+
+            for i, data_url in enumerate(signatures[:3]):
+                try:
+                    x = page_width - sig_width - margin
+                    y = margin + i * (sig_height + spacing)
+                    _draw_signature_data_url(c_overlay, data_url, x, y, sig_width, sig_height)
+                except Exception as e:
+                    logger.error(f"[generate_form_json_pdf] Signature ignorée: {e}")
+
+            c_overlay.save()
+            packet.seek(0)
+            overlay_pdf = PdfReader(packet)
+            if overlay_pdf.pages:
+                target_page.merge_page(overlay_pdf.pages[0])
+        except Exception as e:
+            logger.error(f"[generate_form_json_pdf] Erreur overlay signature: {e}")
+
+    # 3) Rendu JSON explicite du formulaire final (toujours genere).
+    # Cela garantit la presence des sections H1 / FileUpload / Signature
+    # dans le PDF final, meme si un document source est fourni.
+    fields_to_render = fields
+
+    if fields_to_render:
+        layout_buffer = BytesIO()
+        c = canvas.Canvas(layout_buffer, pagesize=A4)
+        y = 800
+
+        c.setFont("Helvetica-Bold", 18)
+        c.drawString(60, y, form_json.get("title", "Formulaire"))
+        y -= 35
+
+        c.setFont("Helvetica", 11)
+        for field in fields_to_render:
+            ftype = field.get("type", "")
+            if ftype in {"heading1", "heading2", "heading3", "heading4", "heading5", "heading6", "paragraph"}:
+                text = field.get("text", "")
+                if text:
+                    c.setFont("Helvetica-Bold" if ftype.startswith("heading") else "Helvetica", 11)
+                    c.drawString(60, y, text[:120])
+                    y -= 18
+                    c.setFont("Helvetica", 11)
+                continue
+
+            label = field.get("label", field.get("id", "Champ"))
+            value = field.get("value", "")
+
+            if ftype == "file":
+                c.drawString(60, y, f"{label}")
+                y -= 18
+
+                if source_is_image and source_image_reader and source_image_size:
+                    img_w, img_h = source_image_size
+                    max_w = 420
+                    max_h = 260
+                    ratio = min(max_w / img_w, max_h / img_h)
+                    draw_w = img_w * ratio
+                    draw_h = img_h * ratio
+
+                    if y - draw_h < 80:
+                        c.showPage()
+                        y = 800
+                        c.setFont("Helvetica", 11)
+
+                    c.drawImage(
+                        source_image_reader,
+                        60,
+                        y - draw_h,
+                        width=draw_w,
+                        height=draw_h,
+                        preserveAspectRatio=True,
+                        mask='auto',
+                    )
+                    y -= draw_h + 14
+            elif ftype == "signature":
+                c.drawString(60, y, f"{label}")
+                sig_drawn = False
+                if isinstance(value, str) and value.startswith("data:image"):
+                    try:
+                        sig_drawn = _draw_signature_data_url(c, value, 260, y - 55, 170, 55)
+                    except Exception as e:
+                        logger.error(f"[generate_form_json_pdf] Signature render echoue: {e}")
+                if not sig_drawn:
+                    c.rect(260, y - 55, 170, 55)
+                y -= 70
+            else:
+                if value not in (None, ""):
+                    c.drawString(60, y, f"{label} [{ftype}] : {str(value)[:120]}")
+                else:
+                    c.drawString(60, y, f"{label} [{ftype}]")
+                y -= 18
+
+            if y < 80:
+                c.showPage()
+                y = 800
+                c.setFont("Helvetica", 11)
+
+        c.save()
+        layout_buffer.seek(0)
+        try:
+            layout_reader = PdfReader(layout_buffer)
+            for page in layout_reader.pages:
+                writer.add_page(page)
+        except Exception as e:
+            logger.error(f"[generate_form_json_pdf] Erreur ajout rendu formulaire: {e}")
+
+    # 4) Fallback minimal si aucune page n'a été créée
+    if len(writer.pages) == 0:
+        fallback = BytesIO()
+        c_fb = canvas.Canvas(fallback, pagesize=A4)
+        c_fb.setFont("Helvetica-Bold", 16)
+        c_fb.drawString(60, 800, form_json.get("title", "Formulaire"))
+        c_fb.save()
+        fallback.seek(0)
+        fallback_reader = PdfReader(fallback)
+        for page in fallback_reader.pages:
+            writer.add_page(page)
+
+    out = BytesIO()
+    writer.write(out)
+    out.seek(0)
+    return ContentFile(out.read(), name=os.path.basename(filename))