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

# ==============================
# ⚙️ CONFIGURATION
# ==============================
DB_CONFIG = {
    "host": "127.0.0.1",
    "port": 3307,
    "user": "root",
    "password": "Vlado9674+",
    "database": "medevio",
    "charset": "utf8mb4",
}

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


# ---- helper function for timing ----
def log_section(name):
    print(f"\n=== ⏱ {name} ===")
    return time.time()


def log_done(start):
    print(f"    -> done in {time.time() - start:0.2f} sec")


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


def make_abbrev(title: str) -> str:
    if not title:
        return ""
    words = re.findall(r"[A-Za-zÁ-Žá-ž0-9]+", title)
    abbr = "".join(w if w.isdigit() else w[0] for w in words)
    return abbr.upper()


# ==============================
# 🧹 DELETE UNEXPECTED FILES
# ==============================
def clean_folder(folder: Path, valid_files: set):
    start = log_section(f"Cleaning folder: {folder.name}")
    if not folder.exists():
        log_done(start)
        return

    for f in folder.iterdir():
        if f.is_file():

            if f.name.startswith("▲"):
                continue

            sanitized = sanitize_name(f.name)
            if sanitized not in valid_files:
                print(f"🗑 Removing unexpected: {f.name}")
                try:
                    f.unlink()
                except Exception as e:
                    print(f"⚠ Could not delete {f}: {e}")

    log_done(start)


# ==============================
# 📦 DB CONNECTION
# ==============================
print("\n🔌 Connecting to DB…")
start_db = time.time()
conn = pymysql.connect(**DB_CONFIG)
cur_meta = conn.cursor(pymysql.cursors.DictCursor)
cur_blob = conn.cursor()
print(f"  -> connected in {time.time() - start_db:0.2f} sec")

print("\n🔍 Loading metadata from DB…")
start_sql = time.time()

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

rows = cur_meta.fetchall()

print(f"📋 Loaded {len(rows)} attachment rows in {time.time() - start_sql:0.2f} sec.\n")


# ==============================
# 🧠 MAIN LOOP
# ==============================
processed_requests = set()

for r in rows:
    req_id = r["request_id"]

    if req_id in processed_requests:
        continue
    processed_requests.add(req_id)

    section = f"Processing request {req_id}"
    sec_start = log_section(section)

    # ========== FETCH ALL VALID FILES ==========
    start_valid = log_section("Loading valid filenames")
    cur_meta.execute(
        "SELECT filename FROM medevio_downloads WHERE request_id=%s",
        (req_id,)
    )
    valid_files = {sanitize_name(row["filename"]) for row in cur_meta.fetchall()}
    log_done(start_valid)

    # ========== PREPARE FOLDER NAME ==========
    updated_at = r["req_updated_at"] or datetime.now()
    date_str = updated_at.strftime("%Y-%m-%d")

    prijmeni = sanitize_name(r["prijmeni"] or "Unknown")
    jmeno = sanitize_name(r["jmeno"] or "")
    title = r.get("displayTitle") or ""
    abbr = make_abbrev(title)

    clean_folder_name = sanitize_name(
        f"{date_str} {prijmeni}, {jmeno} [{abbr}] {req_id}"
    )

    # ========== DETECT EXISTING FOLDER ==========
    start_detect = log_section("Detecting existing folder(s)")
    existing_folder = None
    folder_has_flag = False

    for f in BASE_DIR.iterdir():
        if f.is_dir() and req_id in f.name:
            existing_folder = f
            folder_has_flag = ("▲" in f.name)
            break
    log_done(start_detect)

    main_folder = existing_folder if existing_folder else BASE_DIR / clean_folder_name

    # ========== MERGE DUPLICATES ==========
    start_merge = log_section("Scanning for duplicate folders")
    possible_dups = [
        f for f in BASE_DIR.iterdir()
        if f.is_dir() and req_id in f.name and f != main_folder
    ]

    for dup in possible_dups:
        print(f"♻ Merging duplicate 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)

    log_done(start_merge)

    # ========== CLEAN MAIN FOLDER ==========
    clean_folder(main_folder, valid_files)

    # ========== DOWNLOAD MISSING FILES ==========
    start_dl = log_section("Downloading missing files")
    added_new_file = False
    main_folder.mkdir(parents=True, exist_ok=True)

    for filename in valid_files:
        dest_plain = main_folder / filename
        dest_marked = main_folder / ("▲" + filename)

        if dest_plain.exists() or dest_marked.exists():
            continue

        added_new_file = True

        cur_blob.execute(
            "SELECT file_content FROM medevio_downloads "
            "WHERE request_id=%s AND filename=%s",
            (req_id, filename)
        )
        row = cur_blob.fetchone()

        if not row or not row[0]:
            continue

        with open(dest_plain, "wb") as f:
            f.write(row[0])

        print(f"💾 wrote: {dest_plain.name}")

    log_done(start_dl)

    # ========== REMOVE FOLDER FLAG ==========
    if added_new_file and "▲" in main_folder.name:
        try:
            new_name = main_folder.name.replace("▲", "").strip()
            new_path = main_folder.parent / new_name
            main_folder.rename(new_path)
            print(f"🔄 Folder flag removed → {new_name}")
            main_folder = new_path
        except Exception as e:
            print(f"⚠ Could not rename folder: {e}")

    log_done(sec_start)


print("\n🎯 Export complete.\n")

cur_blob.close()
cur_meta.close()
conn.close()