#!/usr/bin/env python3
"""
Fast DB Register - Direct MySQL insert into oc_filecache
=========================================================
Registreert bestanden die op het filesystem zijn aangemaakt in de Nextcloud
database (oc_filecache). Veel sneller dan occ files:scan (~500K in ~2 min).
"""
import os
import subprocess
import hashlib
import time

DB_NAME = "{{ nextcloud_db_name }}"
GROUPFOLDERS_DIR = "{{ groupfolders_dir }}"
NUM_TEAMFOLDERS = {{ num_teamfolders }}
FILES_PER_FOLDER = {{ files_per_teamfolder }}
FILE_PREFIX = "{{ dummy_file_prefix }}"
FILE_EXT = "{{ dummy_file_extension }}"
SQL_BATCH_SIZE = {{ sql_batch_size }}


def mysql_exec(sql):
    result = subprocess.run(
        ["mysql", "-u", "root", DB_NAME, "-N", "-e", sql],
        capture_output=True, text=True, timeout=120
    )
    if result.returncode != 0 and result.stderr.strip():
        print(f"  [SQL ERROR] {result.stderr[:200]}")
    return result.stdout.strip()


def mysql_exec_file(filepath):
    with open(filepath) as f:
        result = subprocess.run(
            ["mysql", "-u", "root", DB_NAME, "--max-allowed-packet=64M"],
            stdin=f, capture_output=True, text=True, timeout=300
        )
    if result.returncode != 0:
        print(f"  [SQL ERROR] {result.stderr[:200]}")
    return result


def escape_sql(s):
    return s.replace("\\", "\\\\").replace("'", "\\'")


def main():
    start_time = time.time()
    now = int(time.time())

    print("=" * 60)
    print("Fast DB Register - oc_filecache insert")
    print(f"Doel: {NUM_TEAMFOLDERS} folders x {FILES_PER_FOLDER} bestanden")
    print("=" * 60)

    # Get storage mapping (gf_id -> storage numeric_id)
    print("\nStap 1: Ophalen storage mapping...")
    rows = mysql_exec("""
        SELECT s.numeric_id,
               REPLACE(REPLACE(s.id, 'local::/var/www/nextcloud/data/__groupfolders/', ''), '/', '') as folder_num
        FROM oc_storages s
        WHERE s.id LIKE 'local::%/__groupfolders/%'
    """)
    storage_map = {}
    for line in rows.split('\n'):
        if line.strip():
            parts = line.split('\t')
            storage_map[int(parts[1])] = int(parts[0])

    # Get groupfolder mapping
    print("Stap 2: Ophalen groupfolder mapping...")
    rows = mysql_exec("""
        SELECT folder_id, mount_point FROM oc_group_folders
        WHERE mount_point LIKE '{{ teamfolder_prefix }}-%'
        ORDER BY folder_id
    """)
    gf_map = {}
    for line in rows.split('\n'):
        if line.strip():
            parts = line.split('\t')
            gf_id = int(parts[0])
            tf_idx = int(parts[1].split('-')[-1])
            if tf_idx <= NUM_TEAMFOLDERS:
                gf_map[tf_idx] = gf_id

    print(f"  {len(gf_map)} teamfolders gevonden")

    # Get mimetype IDs
    txt_mime = int(mysql_exec("SELECT id FROM oc_mimetypes WHERE mimetype='text/plain'"))
    txt_part = int(mysql_exec("SELECT id FROM oc_mimetypes WHERE mimetype='text'"))

    total_inserted = 0

    for tf_idx in sorted(gf_map.keys()):
        gf_id = gf_map[tf_idx]
        storage_id = storage_map.get(gf_id)
        if not storage_id:
            print(f"  [SKIP] Geen storage voor gf_id {gf_id}")
            continue

        # Check if files already registered
        existing = mysql_exec(f"""
            SELECT COUNT(*) FROM oc_filecache
            WHERE storage = {storage_id} AND path LIKE 'files/{FILE_PREFIX}%'
        """)
        if existing and int(existing) >= FILES_PER_FOLDER:
            print(f"  [SKIP] Folder {tf_idx} (gf_id={gf_id}): {existing} bestanden al geregistreerd")
            total_inserted += int(existing)
            continue

        # Get parent fileid for 'files' directory
        files_parent = mysql_exec(f"SELECT fileid FROM oc_filecache WHERE storage = {storage_id} AND path = 'files'")
        if not files_parent:
            print(f"  [SKIP] Geen files entry voor storage {storage_id}")
            continue
        parent_id = int(files_parent)

        # Get file size from disk
        sample_file = f"{GROUPFOLDERS_DIR}/{gf_id}/files/{FILE_PREFIX}-00001.{FILE_EXT}"
        try:
            file_size = os.path.getsize(sample_file)
        except OSError:
            file_size = 80  # fallback

        # Generate INSERT statements in batches
        values = []
        for i in range(1, FILES_PER_FOLDER + 1):
            fname = f"{FILE_PREFIX}-{i:05d}.{FILE_EXT}"
            path = f"files/{fname}"
            path_hash = hashlib.md5(path.encode()).hexdigest()
            etag = hashlib.md5(f"{now}{path}".encode()).hexdigest()

            values.append(
                f"({storage_id}, '{escape_sql(path)}', '{path_hash}', {parent_id}, "
                f"'{escape_sql(fname)}', {txt_mime}, {txt_part}, {file_size}, "
                f"{now}, {now}, '{etag}', 27, 0)"
            )

            if len(values) >= SQL_BATCH_SIZE:
                sql_file = "/tmp/filecache_batch.sql"
                with open(sql_file, 'w') as f:
                    f.write("INSERT IGNORE INTO oc_filecache "
                            "(storage, path, path_hash, parent, name, mimetype, mimepart, "
                            "size, mtime, storage_mtime, etag, permissions, unencrypted_size) VALUES\n")
                    f.write(",\n".join(values))
                    f.write(";\n")
                mysql_exec_file(sql_file)
                values = []

        # Flush remaining
        if values:
            sql_file = "/tmp/filecache_batch.sql"
            with open(sql_file, 'w') as f:
                f.write("INSERT IGNORE INTO oc_filecache "
                        "(storage, path, path_hash, parent, name, mimetype, mimepart, "
                        "size, mtime, storage_mtime, etag, permissions, unencrypted_size) VALUES\n")
                f.write(",\n".join(values))
                f.write(";\n")
            mysql_exec_file(sql_file)

        total_inserted += FILES_PER_FOLDER
        elapsed = time.time() - start_time
        rate = total_inserted / elapsed if elapsed > 0 else 0
        print(f"  [DONE] Folder {tf_idx} (gf_id={gf_id}): {FILES_PER_FOLDER} records ({elapsed:.0f}s, totaal: {total_inserted}, {rate:.0f}/s)")

    elapsed = time.time() - start_time
    print(f"\n{'='*60}")
    print(f"Voltooid in {elapsed:.0f} seconden")
    print(f"Totaal geregistreerd: {total_inserted}")
    print(f"{'='*60}")


if __name__ == "__main__":
    main()