#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
PDF Mask Designer (Standalone)
------------------------------
- Ouvre un PDF de référence
- Permet de "dessiner des masques" (rectangles) à la souris, par page
- Sauvegarde/charge un template (YAML/JSON) décrivant les masques
- Prévisualise l'application des masques sur 1–2 PDF
- Applique les masques :
   * Vectoriel : annotations de redaction (le texte est supprimé)
   * Raster : "brûle" les boîtes noires dans l'image de page (sécurité maximale)
- Journal/Audit : écrit *.audit.jsonl avec MASK_TEMPLATE + bbox + nom de template

Dépendances : PyMuPDF (pymupdf), Pillow, PyYAML
    pip install pymupdf==1.24.9 Pillow==10.2.0 PyYAML==6.0.2
"""

from __future__ import annotations
import io
import json
import math
import os
from dataclasses import dataclass, asdict
from pathlib import Path
from typing import Dict, List, Optional, Tuple, Any

import tkinter as tk
from tkinter import filedialog, messagebox, ttk
from PIL import Image, ImageTk
import fitz  # PyMuPDF
import yaml

APP_TITLE = "PDF Mask Designer (Standalone)"
TEMPLATE_VERSION = 1

# ----------------------------- Data structures -----------------------------

@dataclass
class MaskRect:
    page: int
    x0: float
    y0: float
    x1: float
    y1: float
    label: str = "MASK"

@dataclass
class Template:
    name: str
    page_size: Tuple[float, float]  # (width, height) in PDF points
    version: int = TEMPLATE_VERSION
    masks: List[MaskRect] = None

    def to_dict(self) -> Dict[str, Any]:
        return {
            "version": self.version,
            "name": self.name,
            "page_size": {"width": self.page_size[0], "height": self.page_size[1]},
            "masks": [asdict(m) for m in (self.masks or [])],
        }

    @staticmethod
    def from_dict(d: Dict[str, Any]) -> "Template":
        ps = d.get("page_size") or {}
        masks = []
        for m in d.get("masks", []):
            masks.append(MaskRect(
                page=int(m["page"]),
                x0=float(m["x0"]), y0=float(m["y0"]),
                x1=float(m["x1"]), y1=float(m["y1"]),
                label=m.get("label", "MASK")
            ))
        name = d.get("name") or "template"
        return Template(name=name, page_size=(float(ps.get("width", 595)), float(ps.get("height", 842))),
                        version=int(d.get("version", TEMPLATE_VERSION)), masks=masks)

# ----------------------------- Utility funcs ------------------------------

def clamp(v, a, b): return max(a, min(b, v))

def rect_norm(x0, y0, x1, y1) -> Tuple[float, float, float, float]:
    return (min(x0, x1), min(y0, y1), max(x0, x1), max(y0, y1))

def page_pix(doc: fitz.Document, pno: int, zoom: float) -> Image.Image:
    page = doc[pno]
    mat = fitz.Matrix(zoom, zoom)
    pix = page.get_pixmap(matrix=mat, annots=False)
    img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
    return img

def draw_overlay(img: Image.Image, rects: List[MaskRect], zoom: float, page: int) -> Image.Image:
    # returns a copy with alpha-red rectangles
    from PIL import ImageDraw
    out = img.copy()
    draw = ImageDraw.Draw(out, "RGBA")
    for r in rects:
        if r.page != page: continue
        draw.rectangle([r.x0*zoom, r.y0*zoom, r.x1*zoom, r.y1*zoom], fill=(0,0,0,110), outline=(0,0,0,220), width=2)
    return out

def save_template_yaml(tpl: Template, path: Path):
    with open(path, "w", encoding="utf-8") as f:
        yaml.safe_dump(tpl.to_dict(), f, allow_unicode=True, sort_keys=False)

def load_template_yaml(path: Path) -> Template:
    d = yaml.safe_load(path.read_text(encoding="utf-8")) or {}
    return Template.from_dict(d)

# ----------------------------- Application logic --------------------------

def apply_template_vector(pdf_in: Path, pdf_out: Path, tpl: Template, audit_path: Path):
    doc = fitz.open(str(pdf_in))
    w0, h0 = tpl.page_size
    with audit_path.open("w", encoding="utf-8") as audit:
        for pno in range(len(doc)):
            page = doc[pno]
            pw, ph = page.rect.width, page.rect.height
            # scaling if page size differs (simple proportional fit)
            sx, sy = pw / w0 if w0 else 1.0, ph / h0 if h0 else 1.0
            for m in tpl.masks or []:
                if m.page not in (-1, pno):  # -1 = all pages
                    continue
                r = fitz.Rect(m.x0*sx, m.y0*sy, m.x1*sx, m.y1*sy)
                page.add_redact_annot(r, fill=(0,0,0))
                audit.write(json.dumps({
                    "kind": "MASK_TEMPLATE", "template": tpl.name, "page": pno,
                    "bbox": [round(r.x0,2), round(r.y0,2), round(r.x1,2), round(r.y1,2)],
                    "mode": "vector"
                }, ensure_ascii=False) + "\n")
            try:
                page.apply_redactions()
            except Exception:
                pass
    doc.save(str(pdf_out), deflate=True, garbage=4, clean=True, incremental=False)
    doc.close()

def apply_template_raster(pdf_in: Path, pdf_out: Path, tpl: Template, dpi: int, audit_path: Path):
    doc = fitz.open(str(pdf_in))
    out = fitz.open()
    w0, h0 = tpl.page_size
    with audit_path.open("w", encoding="utf-8") as audit:
        for pno in range(len(doc)):
            page = doc[pno]; pw, ph = page.rect.width, page.rect.height
            sx, sy = pw / w0 if w0 else 1.0, ph / h0 if h0 else 1.0
            zoom = dpi/72.0
            pix = page.get_pixmap(matrix=fitz.Matrix(zoom, zoom), annots=False)
            img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
            from PIL import ImageDraw
            draw = ImageDraw.Draw(img)
            for m in tpl.masks or []:
                if m.page not in (-1, pno): continue
                r = fitz.Rect(m.x0*sx, m.y0*sy, m.x1*sx, m.y1*sy)
                draw.rectangle([r.x0*zoom, r.y0*zoom, r.x1*zoom, r.y1*zoom], fill=(0,0,0))
                audit.write(json.dumps({
                    "kind": "MASK_TEMPLATE", "template": tpl.name, "page": pno,
                    "bbox": [round(r.x0,2), round(r.y0,2), round(r.x1,2), round(r.y1,2)],
                    "mode": "raster"
                }, ensure_ascii=False) + "\n")
            buf = io.BytesIO()
            img.save(buf, format="PNG"); buf.seek(0)
            dst = out.new_page(width=page.rect.width, height=page.rect.height)
            dst.insert_image(page.rect, stream=buf.getvalue())
    out.save(str(pdf_out), deflate=True, garbage=4, clean=True)
    out.close(); doc.close()

# ----------------------------- GUI ------------------------------

class MaskDesignerApp:
    def __init__(self, root: tk.Tk):
        self.root = root
        self.root.title(APP_TITLE)
        self.root.geometry("1280x900")
        self.zoom = 1.25  # affichage
        self.doc: Optional[fitz.Document] = None
        self.doc_path: Optional[Path] = None
        self.curr_page = 0
        self.curr_image: Optional[Image.Image] = None
        self.tk_image: Optional[ImageTk.PhotoImage] = None
        self.masks: Dict[int, List[MaskRect]] = {}  # per-page
        self.template_name = tk.StringVar(value="template_masks")
        self.status = tk.StringVar(value="Prêt.")
        self.raster_dpi = tk.IntVar(value=200)

        self.is_drawing = False
        self.start_xy: Optional[Tuple[int,int]] = None

        self._build_ui()

    # UI layout
    def _build_ui(self):
        top = tk.Frame(self.root, padx=8, pady=8)
        top.pack(fill=tk.BOTH, expand=True)
        bar = tk.Frame(top); bar.pack(fill=tk.X)

        tk.Button(bar, text="Ouvrir PDF…", command=self.open_pdf).pack(side=tk.LEFT)
        tk.Button(bar, text="←", command=self.prev_page).pack(side=tk.LEFT, padx=(8,2))
        tk.Button(bar, text="→", command=self.next_page).pack(side=tk.LEFT, padx=2)
        tk.Button(bar, text="Zoom -", command=lambda: self.set_zoom( max(0.5, self.zoom-0.1) )).pack(side=tk.LEFT, padx=6)
        tk.Button(bar, text="Zoom +", command=lambda: self.set_zoom( self.zoom+0.1 )).pack(side=tk.LEFT, padx=2)

        tk.Label(bar, text="Nom template :").pack(side=tk.LEFT, padx=(12,2))
        tk.Entry(bar, textvariable=self.template_name, width=24).pack(side=tk.LEFT)
        tk.Button(bar, text="Sauver template…", command=self.save_template).pack(side=tk.LEFT, padx=6)
        tk.Button(bar, text="Charger template…", command=self.load_template).pack(side=tk.LEFT, padx=2)
        tk.Button(bar, text="Effacer masques page", command=self.clear_page_masks).pack(side=tk.LEFT, padx=12)

        tools = tk.Frame(top); tools.pack(fill=tk.X, pady=(4,2))
        tk.Label(tools, text="Prévisualiser / Appliquer sur un échantillon :").pack(side=tk.LEFT)
        tk.Button(tools, text="Prévisualiser (vector)", command=self.preview_vector).pack(side=tk.LEFT, padx=6)
        tk.Button(tools, text="Prévisualiser (raster)", command=self.preview_raster).pack(side=tk.LEFT, padx=2)
        tk.Label(tools, text="DPI raster:").pack(side=tk.LEFT, padx=(12,2))
        tk.Entry(tools, textvariable=self.raster_dpi, width=6).pack(side=tk.LEFT)

        tk.Button(tools, text="Appliquer (vector)…", command=self.apply_vector_batch).pack(side=tk.LEFT, padx=(16,4))
        tk.Button(tools, text="Appliquer (raster)…", command=self.apply_raster_batch).pack(side=tk.LEFT, padx=2)

        self.canvas = tk.Canvas(top, bg="#f5f7fb")
        self.canvas.pack(fill=tk.BOTH, expand=True, pady=(6,4))
        self.canvas.bind("<ButtonPress-1>", self.on_down)
        self.canvas.bind("<B1-Motion>", self.on_drag)
        self.canvas.bind("<ButtonRelease-1>", self.on_up)

        statusbar = tk.Label(self.root, textvariable=self.status, anchor="w", bd=1, relief=tk.SUNKEN)
        statusbar.pack(side=tk.BOTTOM, fill=tk.X)

    # Document handling
    def open_pdf(self):
        path = filedialog.askopenfilename(filetypes=[("PDF", "*.pdf")])
        if not path: return
        try:
            self.doc = fitz.open(path)
            self.doc_path = Path(path)
            self.curr_page = 0
            self.masks.clear()
            self.template_name.set(self.doc_path.stem + "_template")
            self.refresh()
            self.status.set(f"PDF ouvert : {Path(path).name} — {len(self.doc)} page(s)")
        except Exception as e:
            messagebox.showerror("Erreur", f"Impossible d'ouvrir le PDF : {e}")

    def refresh(self):
        if not self.doc: return
        img = page_pix(self.doc, self.curr_page, self.zoom)
        # overlay current page masks
        rects = self.masks.get(self.curr_page, [])
        img_o = draw_overlay(img, rects, 1.0, self.curr_page)
        self.curr_image = img_o
        self.tk_image = ImageTk.PhotoImage(img_o)
        self.canvas.delete("all")
        self.canvas.create_image(0,0, anchor="nw", image=self.tk_image)
        self.canvas.config(scrollregion=(0,0,img_o.width, img_o.height))

    def prev_page(self):
        if not self.doc: return
        self.curr_page = max(0, self.curr_page-1)
        self.refresh()

    def next_page(self):
        if not self.doc: return
        self.curr_page = min(len(self.doc)-1, self.curr_page+1)
        self.refresh()

    def set_zoom(self, z: float):
        self.zoom = clamp(z, 0.5, 3.0)
        self.refresh()

    # Drawing masks
    def on_down(self, ev):
        if not self.doc: return
        self.is_drawing = True
        self.start_xy = (ev.x, ev.y)
        self._preview_rect = self.canvas.create_rectangle(ev.x, ev.y, ev.x, ev.y, outline="#000", width=2)

    def on_drag(self, ev):
        if not self.doc or not self.is_drawing: return
        sx, sy = self.start_xy
        self.canvas.coords(self._preview_rect, sx, sy, ev.x, ev.y)

    def on_up(self, ev):
        if not self.doc or not self.is_drawing: return
        self.is_drawing = False
        sx, sy = self.start_xy
        x0, y0, x1, y1 = rect_norm(sx, sy, ev.x, ev.y)
        # convert screen px to PDF points
        page = self.doc[self.curr_page]
        # we rendered with zoom, but here current image is at display resolution (zoom applied in page_pix)
        # So we need to divide by zoom to get PDF points (since page_pix used Matrix(zoom, zoom))
        z = self.zoom
        rx0, ry0, rx1, ry1 = x0 / z, y0 / z, x1 / z, y1 / z
        rect = MaskRect(page=self.curr_page, x0=rx0, y0=ry0, x1=rx1, y1=ry1, label="MASK")
        self.masks.setdefault(self.curr_page, []).append(rect)
        self.canvas.delete(self._preview_rect)
        self.refresh()
        self.status.set(f"Masque ajouté p.{self.curr_page+1}: ({int(rx0)},{int(ry0)})–({int(rx1)},{int(ry1)})")

    # Template I/O
    def _current_template(self) -> Template:
        if not self.doc:
            raise RuntimeError("Aucun PDF ouvert.")
        page0 = self.doc[0]
        tpl = Template(
            name=self.template_name.get().strip() or "template",
            page_size=(page0.rect.width, page0.rect.height),
            masks=[m for arr in self.masks.values() for m in arr]
        )
        return tpl

    def save_template(self):
        try:
            tpl = self._current_template()
        except Exception as e:
            messagebox.showwarning("Info", str(e)); return
        path = filedialog.asksaveasfilename(defaultextension=".yml",
                                            filetypes=[("YAML", "*.yml *.yaml"), ("JSON", "*.json")],
                                            initialfile=f"{tpl.name}.yml")
        if not path: return
        p = Path(path)
        try:
            if p.suffix.lower() in (".yml", ".yaml"):
                save_template_yaml(tpl, p)
            else:
                p.write_text(json.dumps(tpl.to_dict(), ensure_ascii=False, indent=2), encoding="utf-8")
            messagebox.showinfo("OK", f"Template enregistré : {p.name}")
        except Exception as e:
            messagebox.showerror("Erreur", f"Impossible d'écrire le template : {e}")

    def load_template(self):
        path = filedialog.askopenfilename(filetypes=[("YAML/JSON", "*.yml *.yaml *.json")])
        if not path: return
        p = Path(path)
        try:
            if p.suffix.lower() in (".yml", ".yaml"):
                tpl = load_template_yaml(p)
            else:
                tpl = Template.from_dict(json.loads(p.read_text(encoding="utf-8")))
            self.template_name.set(tpl.name)
            # reset masks and map to current doc pages (keep same page numbers; -1 means all pages)
            self.masks.clear()
            for m in tpl.masks or []:
                self.masks.setdefault(m.page, []).append(m)
            self.refresh()
            self.status.set(f"Template chargé : {p.name}")
        except Exception as e:
            messagebox.showerror("Erreur", f"Template invalide : {e}")

    def clear_page_masks(self):
        if not self.doc: return
        if self.curr_page in self.masks:
            del self.masks[self.curr_page]
            self.refresh()
            self.status.set(f"Masques de la page {self.curr_page+1} supprimés.")

    # Preview / Apply
    def _build_template_from_state(self) -> Optional[Template]:
        if not self.doc:
            messagebox.showwarning("Info", "Ouvrez d'abord un PDF de référence.")
            return None
        return self._current_template()

    def preview_vector(self):
        tpl = self._build_template_from_state()
        if not tpl: return
        samp = filedialog.askopenfilenames(title="Choisir 1 ou 2 PDF pour prévisualisation", filetypes=[("PDF","*.pdf")])
        if not samp: return
        for i, s in enumerate(samp[:2], start=1):
            pdf_in = Path(s)
            out_dir = pdf_in.parent / "masked_preview"
            out_dir.mkdir(exist_ok=True)
            pdf_out = out_dir / f"{pdf_in.stem}.preview_vector.pdf"
            audit = out_dir / f"{pdf_in.stem}.audit.jsonl"
            try:
                apply_template_vector(pdf_in, pdf_out, tpl, audit)
            except Exception as e:
                messagebox.showerror("Erreur", f"Prévisualisation vectorielle échouée sur {pdf_in.name} : {e}")
        messagebox.showinfo("Prévisualisation", "Terminé (vectoriel). Ouvrez le dossier 'masked_preview'.")

    def preview_raster(self):
        tpl = self._build_template_from_state()
        if not tpl: return
        samp = filedialog.askopenfilenames(title="Choisir 1 ou 2 PDF pour prévisualisation", filetypes=[("PDF","*.pdf")])
        if not samp: return
        dpi = int(self.raster_dpi.get())
        for i, s in enumerate(samp[:2], start=1):
            pdf_in = Path(s)
            out_dir = pdf_in.parent / "masked_preview"
            out_dir.mkdir(exist_ok=True)
            pdf_out = out_dir / f"{pdf_in.stem}.preview_raster.pdf"
            audit = out_dir / f"{pdf_in.stem}.audit.jsonl"
            try:
                apply_template_raster(pdf_in, pdf_out, tpl, dpi, audit)
            except Exception as e:
                messagebox.showerror("Erreur", f"Prévisualisation raster échouée sur {pdf_in.name} : {e}")
        messagebox.showinfo("Prévisualisation", "Terminé (raster). Ouvrez le dossier 'masked_preview'.")

    def apply_vector_batch(self):
        tpl = self._build_template_from_state()
        if not tpl: return
        files = filedialog.askopenfilenames(title="Choisir des PDF à traiter (vectoriel)", filetypes=[("PDF","*.pdf")])
        if not files: return
        for s in files:
            pdf_in = Path(s)
            out_dir = pdf_in.parent / "masked"
            out_dir.mkdir(exist_ok=True)
            pdf_out = out_dir / f"{pdf_in.stem}.masked_vector.pdf"
            audit = out_dir / f"{pdf_in.stem}.audit.jsonl"
            try:
                apply_template_vector(pdf_in, pdf_out, tpl, audit)
            except Exception as e:
                messagebox.showerror("Erreur", f"Échec sur {pdf_in.name}: {e}")
        messagebox.showinfo("Terminé", "Masques appliqués (vectoriel).")

    def apply_raster_batch(self):
        tpl = self._build_template_from_state()
        if not tpl: return
        files = filedialog.askopenfilenames(title="Choisir des PDF à traiter (raster)", filetypes=[("PDF","*.pdf")])
        if not files: return
        dpi = int(self.raster_dpi.get())
        for s in files:
            pdf_in = Path(s)
            out_dir = pdf_in.parent / "masked"
            out_dir.mkdir(exist_ok=True)
            pdf_out = out_dir / f"{pdf_in.stem}.masked_raster.pdf"
            audit = out_dir / f"{pdf_in.stem}.audit.jsonl"
            try:
                apply_template_raster(pdf_in, pdf_out, tpl, dpi, audit)
            except Exception as e:
                messagebox.showerror("Erreur", f"Échec sur {pdf_in.name}: {e}")
        messagebox.showinfo("Terminé", "Masques appliqués (raster).")

# ----------------------------- Main ------------------------------

def main():
    root = tk.Tk()
    app = MaskDesignerApp(root)
    root.mainloop()

if __name__ == "__main__":
    main()