"""
Operazioni sui file della wiki
"""

import re
from pathlib import Path
from typing import List, Dict, Optional
import frontmatter


def list_wiki_pages(wiki_root: Path) -> Dict[str, List[Dict]]:
    """Lista tutte le pagine wiki organizzate per categoria."""
    categories = {
        "entities": [],
        "concepts": [],
        "sources": [],
        "comparisons": [],
        "topics": [],
    }

    for category in categories.keys():
        category_dir = wiki_root / "wiki" / category
        if category_dir.exists():
            for md_file in category_dir.glob("*.md"):
                categories[category].append({
                    "name": md_file.stem,
                    "file": str(md_file),
                    "category": category
                })

    # Anche le pagine root
    for md_file in (wiki_root / "wiki").glob("*.md"):
        if md_file.name not in ["index.md", "log.md", "overview.md"]:
            categories["topics"].append({
                "name": md_file.stem,
                "file": str(md_file),
                "category": "topics"
            })

    return categories


def read_page(file_path: Path) -> Dict:
    """Legge una pagina wiki e restituisce contenuto + metadata."""
    if not file_path.exists():
        return {"error": "File not found"}

    try:
        post = frontmatter.parse(file_path)
        content = post.content
        metadata = post.metadata
    except Exception:
        # Fallback: leggi solo contenuto
        content = file_path.read_text(encoding="utf-8")
        metadata = {}

    return {
        "content": content,
        "metadata": metadata,
        "file": str(file_path)
    }


def write_page(file_path: Path, content: str, metadata: Optional[Dict] = None):
    """Scrive una pagina wiki con frontmatter."""
    # Assicura che la directory esista
    file_path.parent.mkdir(parents=True, exist_ok=True)

    if metadata:
        # Usa frontmatter per scrivere con metadata
        post = frontmatter.Post(content, **metadata)
        with open(file_path, "w", encoding="utf-8") as f:
            frontmatter.dump(post, f)
    else:
        file_path.write_text(content, encoding="utf-8")


def update_index(wiki_root: Path, new_pages: List[str], category: str):
    """Aggiunge pagine all'indice."""
    index_file = wiki_root / "wiki" / "index.md"

    # Leggi indice esistente
    if index_file.exists():
        content = index_file.read_text(encoding="utf-8")
    else:
        content = "# Wiki Index\n\n> Master catalog of all wiki pages.\n\n"

    # Aggiungi nuovo entries
    for page in new_pages:
        # Check se gia presente
        link = f"[[{page}]]"
        if link not in content:
            section = f"## {category.capitalize()}"
            if section not in content:
                content += f"\n{section}\n"
            content += f"- [[{page}]]\n"

    index_file.write_text(content, encoding="utf-8")


def append_log(wiki_root: Path, source_file: str, created: List[str], updated: List[str]):
    """Appende un entry al log."""
    log_file = wiki_root / "wiki" / "log.md"
    from datetime import datetime
    now = datetime.now().strftime("%Y-%m-%d %H:%M")

    entry = f"\n## {now} — {Path(source_file).name}\n"
    if created:
        entry += f"- Created: {', '.join(created)}\n"
    if updated:
        entry += f"- Updated: {', '.join(updated)}\n"

    if log_file.exists():
        content = log_file.read_text(encoding="utf-8")
        # Insert dopo l'header
        lines = content.split("\n")
        insert_idx = 2  # dopo # Wiki Log e ---
        lines.insert(insert_idx, entry)
        content = "\n".join(lines)
    else:
        content = f"# Wiki Log\n\n> Append-only record.\n{entry}\n"

    log_file.write_text(content, encoding="utf-8")


def extract_wikilinks(content: str) -> List[str]:
    """Estrae tutti i [[wikilinks]] dal contenuto."""
    pattern = r'\[\[([^\]]+)\]\]'
    return re.findall(pattern, content)


def get_all_wikilinks(wiki_root: Path) -> Dict[str, List[str]]:
    """Trova tutti i wikilinks in tutte le pagine."""
    links = {}

    for md_file in wiki_root.glob("wiki/**/*.md"):
        if md_file.name == "index.md":
            continue
        try:
            content = md_file.read_text(encoding="utf-8")
            page_links = extract_wikilinks(content)
            if page_links:
                links[str(md_file.relative_to(wiki_root))] = page_links
        except Exception:
            continue

    return links