import re
import unicodedata
from pathlib import Path

from app.core.config import settings
from app.models.notes import NoteItem


def _slugify(text: str, max_len: int = 50) -> str:
    text = unicodedata.normalize("NFD", text)
    text = "".join(c for c in text if unicodedata.category(c) != "Mn")
    text = text.lower()
    text = re.sub(r"[^\w\s-]", "", text)
    text = re.sub(r"[\s_-]+", "-", text)
    return text.strip("-")[:max_len]


def _note_filename(note: NoteItem) -> str:
    date = note.created_at.strftime("%Y-%m-%d")
    raw = note.title or note.content[:40]
    slug = _slugify(raw) or "sans-titre"
    short_id = str(note.id)[:8]
    return f"{date}_{slug}_{short_id}.md"


def _render(note: NoteItem) -> str:
    lines = ["---"]
    lines.append(f"id: {note.id}")
    if note.title:
        lines.append(f'title: "{note.title}"')
    if note.category:
        lines.append(f"category: {note.category}")
    if note.tags:
        tags_str = ", ".join(f'"{t}"' for t in note.tags)
        lines.append(f"tags: [{tags_str}]")
    lines.append(f"created_at: {note.created_at.isoformat()}")
    if note.gps_lat is not None and note.gps_lon is not None:
        lines.append(f'gps: "{note.gps_lat}, {note.gps_lon}"')
    lines.append("---")
    lines.append("")
    lines.append(note.content)

    images = [a for a in note.attachments if a.file_type == "image" and a.file_path]
    audios = [a for a in note.attachments if a.file_type == "audio" and a.file_path]

    if images or audios:
        lines.append("")
        lines.append("## Pièces jointes")
        lines.append("")
        for att in images:
            # file_path est relatif à UPLOAD_DIR, ex: "images/originals/uuid.webp"
            rel = f"../uploads/{att.file_path}"
            name = att.original_name or "image"
            lines.append(f"![{name}]({rel})")
        for att in audios:
            rel = f"../uploads/{att.file_path}"
            name = att.original_name or "audio"
            lines.append(f"[{name}]({rel})")

    return "\n".join(lines) + "\n"


def save_note_markdown(note: NoteItem) -> None:
    notes_dir = settings.notes_md_path
    notes_dir.mkdir(parents=True, exist_ok=True)
    short_id = str(note.id)[:8]
    # Supprime l'ancienne version (titre peut avoir changé)
    for old in notes_dir.glob(f"*_{short_id}.md"):
        old.unlink()
    (notes_dir / _note_filename(note)).write_text(_render(note), encoding="utf-8")


def delete_note_markdown(note_id: str) -> None:
    notes_dir = settings.notes_md_path
    if not notes_dir.exists():
        return
    short_id = note_id[:8]
    for f in notes_dir.glob(f"*_{short_id}.md"):
        f.unlink()