#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import os
import shutil
import pymysql
import re
from pathlib import Path
from datetime import datetime

# ==============================
# ⚙️ CONFIGURATION
# ==============================
DB_CONFIG = {
    "host": "192.168.1.76",
    "port": 3307,
    "user": "root",
    "password": "Vlado9674+",
    "database": "medevio",
    "charset": "utf8mb4",
}

BASE_DIR = Path(r"u:\Dropbox\Ordinace\Dokumentace_ke_zpracování\MP")
BASE_DIR.mkdir(parents=True, exist_ok=True)


def sanitize_name(name: str) -> str:
    return re.sub(r'[<>:"/\\|?*\x00-\x1F]', "_", name).strip()


def clean_folder(folder: Path, valid_files: set):
    """Remove files that do NOT exist in MySQL for this request."""
    if not folder.exists():
        return

    for f in folder.iterdir():
        if f.is_file() and sanitize_name(f.name) not in valid_files:
            print(f"🗑️ Removing unexpected file: {f.name}")
            try:
                f.unlink()
            except Exception as e:
                print(f"⚠️ Cannot delete {f}: {e}")


# ==============================
# 📥 LOAD EVERYTHING IN ONE QUERY
# ==============================
conn = pymysql.connect(**DB_CONFIG)
cur = conn.cursor(pymysql.cursors.DictCursor)

print("📥 Loading ALL metadata + BLOBs with ONE MySQL query…")

cur.execute("""
    SELECT 
        d.id AS download_id,
        d.request_id,
        d.filename,
        d.file_content,
        p.updatedAt AS req_updated_at,
        p.pacient_jmeno AS jmeno,
        p.pacient_prijmeni AS prijmeni
    FROM medevio_downloads d
    JOIN pozadavky p ON d.request_id = p.id
    ORDER BY p.updatedAt DESC, d.created_at ASC
""")

rows = cur.fetchall()
print(f"📦 Loaded {len(rows)} total file rows.\n")

conn.close()

# ==============================
# 🔄 ORGANIZE ROWS PER REQUEST
# ==============================
requests = {}  # req_id → list of file dicts

for r in rows:
    req_id = r["request_id"]
    if req_id not in requests:
        requests[req_id] = []
    requests[req_id].append(r)

print(f"📌 Unique requests: {len(requests)}\n")

# ==============================
# 🧠 MAIN LOOP – SAME LOGIC AS BEFORE
# ==============================
for req_id, filelist in requests.items():

    # ========== GET UPDATEDAT (same logic) ==========
    any_row = filelist[0]
    updated_at = any_row["req_updated_at"] or datetime.now()
    date_str = updated_at.strftime("%Y-%m-%d")

    prijmeni = sanitize_name(any_row["prijmeni"] or "Unknown")
    jmeno = sanitize_name(any_row["jmeno"] or "")

    folder_name = sanitize_name(f"{date_str} {prijmeni}, {jmeno} {req_id}")
    main_folder = BASE_DIR / folder_name

    # ========== VALID FILES ==========
    valid_files = {sanitize_name(r["filename"]) for r in filelist}

    # ========== FIND OLD FOLDERS ==========
    possible_dups = [
        f for f in BASE_DIR.iterdir()
        if f.is_dir() and req_id in f.name and f != main_folder
    ]

    # ========== MERGE OLD FOLDERS ==========
    for dup in possible_dups:
        print(f"♻️ Merging folder: {dup.name}")

        clean_folder(dup, valid_files)
        main_folder.mkdir(parents=True, exist_ok=True)

        for f in dup.iterdir():
            if f.is_file():
                target = main_folder / f.name
                if not target.exists():
                    f.rename(target)

        shutil.rmtree(dup, ignore_errors=True)

    # ========== CLEAN MAIN FOLDER ==========
    main_folder.mkdir(parents=True, exist_ok=True)
    clean_folder(main_folder, valid_files)

    # ========== SAVE FILES (fast now) ==========
    for r in filelist:
        filename = sanitize_name(r["filename"])
        dest = main_folder / filename

        if dest.exists():
            continue

        content = r["file_content"]
        if not content:
            continue

        with open(dest, "wb") as f:
            f.write(content)

        print(f"💾 Saved: {dest.relative_to(BASE_DIR)}")

print("\n🎯 Export complete.\n")