#!/usr/bin/env python3
"""
Create Folder Structure - Mappenstructuur aanmaken en bestanden verplaatsen
===========================================================================
Maakt een 3-niveau mappenstructuur aan binnen elke teamfolder en verplaatst
de bestanden gelijkmatig over de leaf folders.

10 hoofdmappen x 3 submappen = 30 leaf folders per teamfolder.
Bestanden worden verplaatst met os.rename (geen extra diskruimte nodig).
Database (oc_filecache) wordt bijgewerkt met nieuwe paden en parent IDs.
"""
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 }}

FOLDER_STRUCTURE = {{ folder_structure | to_json }}

# Build flat list of leaf paths
LEAF_FOLDERS = []
for main, subs in FOLDER_STRUCTURE.items():
    for sub in subs:
        LEAF_FOLDERS.append(f"{main}/{sub}")

print(f"Folder structuur: {len(FOLDER_STRUCTURE)} hoofdmappen, {len(LEAF_FOLDERS)} submappen")


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())

    # Get storage mapping
    print("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
    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 ID for directories
    dir_mime = int(mysql_exec("SELECT id FROM oc_mimetypes WHERE mimetype='httpd/unix-directory'"))

    total_moved = 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

        folder_num = gf_id
        files_dir = f"{GROUPFOLDERS_DIR}/{folder_num}/files"

        # Check if already restructured
        first_sub = list(FOLDER_STRUCTURE.keys())[0]
        if os.path.isdir(f"{files_dir}/{first_sub}"):
            print(f"  [SKIP] Folder {tf_idx} (gf_id={gf_id}): al gestructureerd")
            total_moved += FILES_PER_FOLDER
            continue

        # Get parent_id 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
        files_parent_id = int(files_parent)

        # Step 1: Create directories on disk
        for main_folder, subs in FOLDER_STRUCTURE.items():
            os.makedirs(f"{files_dir}/{main_folder}", exist_ok=True)
            for sub in subs:
                os.makedirs(f"{files_dir}/{main_folder}/{sub}", exist_ok=True)

        # Step 2: Insert main directory entries into oc_filecache
        dir_values = []
        for main_folder in FOLDER_STRUCTURE.keys():
            path = f"files/{main_folder}"
            path_hash = hashlib.md5(path.encode()).hexdigest()
            etag = hashlib.md5(f"{now}{path}".encode()).hexdigest()
            dir_values.append(
                f"({storage_id}, '{escape_sql(path)}', '{path_hash}', {files_parent_id}, "
                f"'{escape_sql(main_folder)}', {dir_mime}, {dir_mime}, 0, {now}, {now}, '{etag}', 31, 0)"
            )

        sql_file = "/tmp/dir_insert.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(dir_values))
            f.write(";\n")
        mysql_exec_file(sql_file)

        # Get main folder IDs
        main_ids = {}
        for main_folder in FOLDER_STRUCTURE.keys():
            path = f"files/{main_folder}"
            fid = mysql_exec(f"SELECT fileid FROM oc_filecache WHERE storage = {storage_id} AND path = '{escape_sql(path)}'")
            if fid:
                main_ids[main_folder] = int(fid)

        # Insert sub folder entries
        sub_values = []
        for main_folder, subs in FOLDER_STRUCTURE.items():
            parent_id = main_ids.get(main_folder, files_parent_id)
            for sub in subs:
                path = f"files/{main_folder}/{sub}"
                path_hash = hashlib.md5(path.encode()).hexdigest()
                etag = hashlib.md5(f"{now}{path}".encode()).hexdigest()
                sub_values.append(
                    f"({storage_id}, '{escape_sql(path)}', '{path_hash}', {parent_id}, "
                    f"'{escape_sql(sub)}', {dir_mime}, {dir_mime}, 0, {now}, {now}, '{etag}', 31, 0)"
                )

        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(sub_values))
            f.write(";\n")
        mysql_exec_file(sql_file)

        # Get sub folder IDs
        sub_ids = {}
        for main_folder, subs in FOLDER_STRUCTURE.items():
            for sub in subs:
                path = f"files/{main_folder}/{sub}"
                fid = mysql_exec(f"SELECT fileid FROM oc_filecache WHERE storage = {storage_id} AND path = '{escape_sql(path)}'")
                if fid:
                    sub_ids[f"{main_folder}/{sub}"] = int(fid)

        # Step 3: Move files on disk and update DB
        file_rows = mysql_exec(f"""
            SELECT fileid, name FROM oc_filecache
            WHERE storage = {storage_id} AND path LIKE 'files/{{ dummy_file_prefix }}%'
            ORDER BY fileid
        """)
        files = []
        for line in file_rows.split('\n'):
            if line.strip():
                parts = line.split('\t')
                files.append((int(parts[0]), parts[1]))

        if not files:
            print(f"  [SKIP] Folder {tf_idx}: geen bestanden")
            continue

        # Distribute files across leaf folders
        files_per_leaf = len(files) // len(LEAF_FOLDERS)
        remainder = len(files) % len(LEAF_FOLDERS)

        file_idx = 0
        for leaf_idx, leaf_path in enumerate(LEAF_FOLDERS):
            leaf_parent_id = sub_ids.get(leaf_path, files_parent_id)
            count = files_per_leaf + (1 if leaf_idx < remainder else 0)

            for _ in range(count):
                if file_idx >= len(files):
                    break
                fid, fname = files[file_idx]
                old_path = f"{files_dir}/{fname}"
                new_path_disk = f"{files_dir}/{leaf_path}/{fname}"

                if os.path.exists(old_path):
                    os.rename(old_path, new_path_disk)
                file_idx += 1

        # Batch update DB
        BATCH = 2000
        for batch_start in range(0, len(files), BATCH):
            updates = []
            for leaf_idx, leaf_path in enumerate(LEAF_FOLDERS):
                leaf_parent_id = sub_ids.get(leaf_path, files_parent_id)
                count = files_per_leaf + (1 if leaf_idx < remainder else 0)
                leaf_start = sum(files_per_leaf + (1 if i < remainder else 0) for i in range(leaf_idx))
                leaf_end = leaf_start + count

                for i in range(max(leaf_start, batch_start), min(leaf_end, batch_start + BATCH)):
                    if i >= len(files):
                        break
                    fid, fname = files[i]
                    new_path_db = f"files/{leaf_path}/{fname}"
                    new_path_hash = hashlib.md5(new_path_db.encode()).hexdigest()
                    updates.append(f"UPDATE oc_filecache SET path='{escape_sql(new_path_db)}', path_hash='{new_path_hash}', parent={leaf_parent_id} WHERE fileid={fid};")

            if updates:
                with open(sql_file, 'w') as f:
                    f.write("\n".join(updates))
                mysql_exec_file(sql_file)

        # Fix ownership
        os.system(f"chown -R www-data:www-data {files_dir}")

        total_moved += len(files)
        elapsed = time.time() - start_time
        print(f"  [DONE] Folder {tf_idx} (gf_id={gf_id}): {len(files)} bestanden verplaatst naar {len(LEAF_FOLDERS)} submappen ({elapsed:.0f}s, totaal: {total_moved})")

    elapsed = time.time() - start_time
    print(f"\n{'='*60}")
    print(f"Voltooid in {elapsed:.0f} seconden")
    print(f"Totaal verplaatst: {total_moved}")
    print(f"Structuur: {len(FOLDER_STRUCTURE)} hoofdmappen, {len(LEAF_FOLDERS)} submappen per teamfolder")
    print(f"{'='*60}")


if __name__ == "__main__":
    main()