"""Merge per-process joined_chats files into one.
Usage: python merge_joined.py
Loads joined_chats_1.json, _2, _3 (and base), deduplicates by username/id, writes joined_chats.json.
"""
import json
from pathlib import Path

ROOT = Path(r"C:\Users\User\Desktop\_PROJECTS\рассылка")
merged = {}
for suffix in ["", "_1", "_2", "_3"]:
    p = ROOT / f"joined_chats{suffix}.json"
    if p.exists():
        data = json.load(open(p, encoding="utf-8"))
        before = len(merged)
        for k, v in data.items():
            if k not in merged:
                merged[k] = v
        print(f"{p.name}: {len(data)} chats, {len(merged) - before} new")

out = ROOT / "joined_chats.json"
json.dump(merged, open(out, "w"), ensure_ascii=False)
print(f"\nMerged: {len(merged)} unique chats -> joined_chats.json")