import React from 'react';
import { Zap, Activity, BatteryCharging, Power } from 'lucide-react';
import { UpsData } from '../app/page';
import styles from './StatCards.module.css';

interface StatCardsProps {
  data: UpsData | null;
}

export default function StatCards({ data }: StatCardsProps) {
  // If no data received yet (device offline), show dashes
  if (!data) {
    return (
      <div className={styles.cardsGrid}>
        {['Output Status', 'Charging Status', 'Battery Level', 'Power Source'].map(title => (
          <div key={title} className={styles.card}>
            <div className={styles.cardHeader}>
              <span>{title}</span>
            </div>
            <div className={styles.cardContent}>
              <div className={styles.valueArea}>
                <span className={styles.powerSourceValue} style={{ color: 'var(--text-muted)' }}>—</span>
              </div>
              <div className={styles.status}>
                <div className={styles.dot}></div>
                <span style={{ color: 'var(--text-muted)' }}>No signal</span>
              </div>
            </div>
          </div>
        ))}
      </div>
    );
  }

  const outputOn = data.on === 1;
  const isCharging = data.charging === 1;
  const chgError = data.chgError === 1;
  const isFull = data.charging === 0 && (data.battP ?? 0) >= 95 && (data.line ?? 0) > 0;

  let chargingText = "Discharging";
  if (chgError) chargingText = "Error";
  else if (isFull) chargingText = "Fully Charged";
  else if (isCharging) chargingText = "Charging";
  else if ((data.line ?? 0) > 0) chargingText = "Standby";

  const battPercent = data.battP ?? 0;
  const battVoltage = data.v ?? "0.00";

  const isBypass = (data.line ?? 0) > 0;
  const powerSource = isBypass ? "Adaptor" : "Battery";

  return (
    <div className={styles.cardsGrid}>
      {/* Card 1: Output Status */}
      <div className={styles.card}>
        <div className={styles.cardHeader}>
          <span>Output Status</span>
          <div className={styles.iconWrapper}>
            <Activity size={18} />
          </div>
        </div>
        <div className={styles.cardContent}>
          <div className={styles.valueArea}>
            <span className={styles.powerSourceValue}>{outputOn ? 'ON' : 'OFF'}</span>
          </div>
          <div className={styles.status}>
            <div className={`${styles.dot} ${outputOn ? styles.active : ''}`}></div>
            <span>{outputOn ? 'Powering Load' : 'Disabled'}</span>
          </div>
        </div>
      </div>

      {/* Card 2: Charging Status */}
      <div className={styles.card}>
        <div className={styles.cardHeader}>
          <span>Charging Status</span>
          <div className={styles.iconWrapper}>
            <Zap size={18} />
          </div>
        </div>
        <div className={styles.cardContent}>
          <div className={styles.valueArea}>
            <span className={styles.powerSourceValue}>{chargingText}</span>
          </div>
          <div className={styles.status}>
            <div className={`${styles.dot} ${isCharging || isFull ? styles.active : ''} ${chgError ? styles.error : ''}`}></div>
            <span>{chgError ? 'Check Battery' : isCharging ? 'Active' : 'Idle'}</span>
          </div>
        </div>
      </div>

      {/* Card 3: Battery Level */}
      <div className={styles.card}>
        <div className={styles.cardHeader}>
          <span>Battery Level</span>
          <div className={`${styles.iconWrapper} ${styles.batteryIcon}`}>
            <BatteryCharging size={18} />
          </div>
        </div>
        <div className={styles.cardContent}>
          <div className={styles.valueArea}>
            <span className={styles.value}>{battPercent}</span>
            <span className={styles.unit}>%</span>
            <span className={styles.subtext}>({battVoltage}V)</span>
          </div>
          <div className={styles.progressBarContainer}>
            <div className={styles.progressBar} style={{ width: `${battPercent}%` }}></div>
          </div>
        </div>
      </div>

      {/* Card 4: Power Source */}
      <div className={styles.card}>
        <div className={styles.cardHeader}>
          <span>Power Source</span>
          <div className={`${styles.iconWrapper} ${styles.powerSourceIcon}`}>
            <Power size={18} />
          </div>
        </div>
        <div className={styles.cardContent}>
          <div className={styles.valueArea}>
            <span className={styles.powerSourceValue}>{powerSource}</span>
          </div>
          <div className={styles.status}>
            <span>Relay: {isBypass ? 'Bypass Mode' : 'Inverter Mode'}</span>
          </div>
        </div>
      </div>
    </div>
  );
}