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

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

import math
import sqlite3
import sys
import time
from datetime import datetime, timedelta

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'

# Skala stake (×10000) dan epoch bobot suara Vexanium (1 Jan 2000)
VEX_SCALE = 10000
WEIGHT_EPOCH = datetime(2000, 1, 1)


def derive_last_vote(weight, staked_vex):
    """V13: perkiraan waktu revote terakhir dari rasio bobot/stake.

    Vexanium: last_vote_weight = staked_raw × 2^(tahun sejak 2000).
    Maka t = log2(last_vote_weight / staked_raw) → tanggal revote.
    Kembalikan None bila tak bisa dihitung (bobot/stake nol atau tak valid).
    """
    staked_raw = staked_vex * VEX_SCALE
    if staked_raw <= 0:
        return None
    try:
        ratio = float(weight) / staked_raw
    except (TypeError, ValueError):
        return None
    if ratio <= 0:
        return None
    t_years = math.log(ratio) / math.log(2)
    return (WEIGHT_EPOCH + timedelta(days=t_years * 365.25)).isoformat(timespec='seconds')


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,
        'last_vote': derive_last_vote(row.get('last_vote_weight', ''), 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, '
            'last_vote TEXT)'
        )
        conn.executemany(
            'INSERT INTO voters (owner, weight, staked, scanned_at, last_vote) '
            'VALUES (?, ?, ?, ?, ?)',
            [(r['owner'], r['weight'], r['staked'], scanned_at, r.get('last_vote'))
             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())