"""Scan tabel voters Vexanium, simpan pemilih BP databisnisid + bobot suara ke SQLite.

Berjalan imparsial (repeatable) dan siap dijadwalkan (cron). Memakai requests.
"""

import sqlite3
import sys
import time
from datetime import datetime

import requests

from config import API_NODE, DB_PATH, MIN_STAKED_VEX, TARGET_BP

# Kontrak & scope sistem Vexanium = vexcore (BUKAN vexio sesuai konvensi EOS)
CODE = 'vexcore'
SCOPE = 'vexcore'
TABLE = 'voters'

# Ukuran halaman saat paginasi
LIMIT = 500

# Ambang-batas nama akun "0" (kodifikasi uint64 0) pada tabel voters
ZERO_OWNER = '...........q'


def fetch_with_retry(payload, max_retries=3, timeout=30):
    """POST ke RPC dengan retry (node publik sering timeout).

    V1: ulang ≥3 kali pada timeout/error HTTP, jeda 2 detik antar percobaan.
    """
    url = f'{API_NODE}/v1/chain/get_table_rows'
    for attempt in range(max_retries):
        try:
            resp = requests.post(url, json=payload, timeout=timeout)
            resp.raise_for_status()
            return resp.json()
        except requests.RequestException:
            if attempt == max_retries - 1:
                raise
            print(f'[Peringatan] Gagal menghubungi node, mencoba lagi... '
                  f'({attempt + 1}/{max_retries})')
            time.sleep(2)


def scan_voters():
    """Iterasi seluruh tabel voters (paginasi), kembalikan daftar mentah.

    V2: majukan lower_bound ke owner terakhir; berhenti saat more=false | baris kosong.
    V3: pada halaman kelanjutan, buang baris pertama (induk pamungkas duplikat).
    """
    rows_all = []
    lower_bound = ''
    has_more = True

    while has_more:
        payload = {
            'json': True,
            'code': CODE,
            'scope': SCOPE,
            'table': TABLE,
            'lower_bound': lower_bound,
            'limit': LIMIT,
        }
        data = fetch_with_retry(payload)
        rows = data.get('rows') or []
        if not rows:
            break

        if lower_bound != '':
            rows = rows[1:]

        rows_all.extend(rows)
        has_more = data.get('more', False)

        if has_more:
            lower_bound = rows_all[-1]['owner']

    return rows_all


def normalize(row):
    """V4/V5/V6: saring ke baris yang relevan, bidang dinormalisasi."""
    owner = row['owner']
    if owner == ZERO_OWNER:  # V4: lewati sentinel nama akun 0
        return None
    if not (row.get('producers') == [TARGET_BP]):  # V5
        return None
    staked_vex = float(row.get('staked', 0)) / 10000  # V8/V9: bisa string, ÷10000
    if staked_vex < MIN_STAKED_VEX:
        return None
    return {
        'owner': owner,
        'weight': row.get('last_vote_weight', ''),  # V6: bobot verbatim (string)
        'staked': staked_vex,
    }


def persist(rows):
    """V7: ganti snapshot — DROP+INSERT tiap skan, ⊥ history/append.

    WAL: journal_mode=WAL → pembaca (dashboard multi-worker) tak terblokir
    saat DROP+INSERT harian. Mode ini persisten setelah diset.
    """
    scanned_at = datetime.now().isoformat(timespec='seconds')
    conn = sqlite3.connect(DB_PATH)
    try:
        conn.execute('PRAGMA journal_mode=WAL')
        conn.execute('DROP TABLE IF EXISTS voters')  # snapshot bersih
        conn.execute(
            'CREATE TABLE voters ('  # I.db
            'owner TEXT PRIMARY KEY, '
            'weight TEXT NOT NULL, '
            'staked REAL NOT NULL, '
            'scanned_at TEXT NOT NULL)'
        )
        conn.executemany(
            'INSERT INTO voters (owner, weight, staked, scanned_at) '
            'VALUES (?, ?, ?, ?)',
            [(r['owner'], r['weight'], r['staked'], scanned_at) for r in rows],
        )
        conn.commit()
    finally:
        conn.close()
    return scanned_at


def summarize(rows, scanned_at):
    """I.cmd: ringkasan stdout dalam bahasa Indonesia, format id-ID."""
    print('\n=== HASIL AKHIR ===')
    print(f'Total pemilih untuk BP [{TARGET_BP}]: {len(rows)}')
    print(f'Waktu pemindaian: {scanned_at}')
    print('\nDaftar Pemilih:')
    if not rows:
        print('(Tidak ada pemilih ditemukan untuk BP ini)')
        return
    for index, row in enumerate(rows, start=1):
        print(f"{index}. {row['owner']} - Stake: "
              f"{row['staked']:,.4f} VEX - Bobot: {row['weight']}")


def main():
    """Titik masuk CLI."""
    print(f'Mulai memindai voters untuk BP: "{TARGET_BP}"...')
    raw = scan_voters()
    filtered = []
    for row in raw:
        item = normalize(row)
        if item is not None:
            filtered.append(item)
    scanned_at = persist(filtered)
    summarize(filtered, scanned_at)
    return 0


if __name__ == '__main__':
    sys.exit(main())