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

"""
Download all 'Odeslat lékařskou zprávu' attachments from Medevio API
and store them (including binary content) directly into MySQL table `medevio_downloads`.

Each attachment (PDF, image, etc.) is fetched once and saved as LONGBLOB.
Duplicate protection is ensured via UNIQUE KEY on `attachment_id`.
"""

import zlib
import json
import requests
import pymysql
from pathlib import Path
from datetime import datetime
import time

# ==============================
# 🔧 CONFIGURATION
# ==============================
TOKEN_PATH = Path("token.txt")
CLINIC_SLUG = "mudr-buzalkova"

DB_CONFIG = {
    "host": "192.168.1.76",
    "port": 3307,
    "user": "root",
    "password": "Vlado9674+",
    "database": "medevio",
    "charset": "utf8mb4",
    "cursorclass": pymysql.cursors.DictCursor,
}

GRAPHQL_QUERY = r"""
query ClinicRequestDetail_GetPatientRequest2($requestId: UUID!) {
  patientRequestMedicalRecords: listMedicalRecordsForPatientRequest(
    attachmentTypes: [ECRF_FILL_ATTACHMENT, MESSAGE_ATTACHMENT, PATIENT_REQUEST_ATTACHMENT]
    patientRequestId: $requestId
    pageInfo: {first: 100, offset: 0}
  ) {
    attachmentType
    id
    medicalRecord {
      contentType
      description
      downloadUrl
      id
      url
      visibleToPatient
    }
  }
}
"""

# ==============================
# 🧮 HELPERS
# ==============================
def short_crc8(uuid_str: str) -> str:
    """Return deterministic 8-char hex string from any input string (CRC32)."""
    return f"{zlib.crc32(uuid_str.encode('utf-8')) & 0xffffffff:08x}"

def extract_filename_from_url(url: str) -> str:
    """Extracts filename from S3-style URL (between last '/' and first '?')."""
    try:
        return url.split("/")[-1].split("?")[0]
    except Exception:
        return "unknown_filename"

def read_token(p: Path) -> str:
    """Read Bearer token from file."""
    tok = p.read_text(encoding="utf-8").strip()
    if tok.startswith("Bearer "):
        tok = tok.split(" ", 1)[1]
    return tok

# ==============================
# 📡 FETCH ATTACHMENTS
# ==============================
def fetch_attachments(headers, request_id):
    variables = {"requestId": request_id}
    payload = {
        "operationName": "ClinicRequestDetail_GetPatientRequest2",
        "query": GRAPHQL_QUERY,
        "variables": variables,
    }
    r = requests.post("https://api.medevio.cz/graphql", json=payload, headers=headers, timeout=30)
    if r.status_code != 200:
        print(f"❌ HTTP {r.status_code} for request {request_id}")
        return []
    data = r.json().get("data", {}).get("patientRequestMedicalRecords", [])
    return data

# ==============================
# 💾 SAVE TO MYSQL
# ==============================
def insert_download(cur, req_id, a, m, jmeno, prijmeni, created_date):
    url = m.get("downloadUrl")
    if not url:
        print("   ⚠️ No download URL")
        return

    try:
        r = requests.get(url, timeout=45)
        r.raise_for_status()
        content = r.content
    except Exception as e:
        print(f"   ⚠️ Failed to download {url}: {e}")
        return

    file_size = len(content)
    filename = extract_filename_from_url(url)
    attachment_id = a.get("id")
    attachment_type = a.get("attachmentType")
    content_type = m.get("contentType")

    cur.execute("""
        INSERT INTO medevio_downloads (
            request_id, attachment_id, attachment_type, filename,
            content_type, file_size, pacient_jmeno, pacient_prijmeni,
            created_at, file_content
        ) VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)
        ON DUPLICATE KEY UPDATE
            file_content = VALUES(file_content),
            file_size = VALUES(file_size),
            downloaded_at = NOW()
    """, (
        req_id,
        attachment_id,
        attachment_type,
        filename,
        content_type,
        file_size,
        jmeno,
        prijmeni,
        created_date,
        content
    ))
    print(f"   💾 Saved {filename} ({file_size/1024:.1f} kB)")

# ==============================
# 🧠 MAIN
# ==============================
def main():
    token = read_token(TOKEN_PATH)
    headers = {
        "Authorization": f"Bearer {token}",
        "Content-Type": "application/json",
        "Accept": "application/json",
    }

    conn = pymysql.connect(**DB_CONFIG)
    with conn.cursor() as cur:
        cur.execute("""
            SELECT id, displayTitle, pacient_prijmeni, pacient_jmeno, createdAt
            FROM pozadavky
            WHERE displayTitle = 'Odeslat lékařskou zprávu'
        """)
        rows = cur.fetchall()

    print(f"📋 Found {len(rows)} 'Odeslat lékařskou zprávu' requests")

    for i, row in enumerate(rows, 1):
        req_id = row["id"]
        prijmeni = row.get("pacient_prijmeni") or "Neznamy"
        jmeno = row.get("pacient_jmeno") or ""
        created = row.get("createdAt")

        try:
            created_date = datetime.strptime(str(created), "%Y-%m-%d %H:%M:%S")
        except Exception:
            created_date = None

        print(f"\n[{i}/{len(rows)}] 🧾 {prijmeni}, {jmeno} ({req_id})")

        attachments = fetch_attachments(headers, req_id)
        if not attachments:
            print("   ⚠️ No attachments")
            continue

        with conn.cursor() as cur:
            for a in attachments:
                m = a.get("medicalRecord") or {}
                insert_download(cur, req_id, a, m, jmeno, prijmeni, created_date)
            conn.commit()

        print(f"   ✅ {len(attachments)} attachments saved for {prijmeni}, {jmeno}")
        time.sleep(0.5)  # be nice to the API

    conn.close()
    print("\n✅ Done! All attachments stored in MySQL table `medevio_downloads`.")

# ==============================
if __name__ == "__main__":
    main()