'use client';

import posthog from 'posthog-js';

let initialized = false;
let posthogReady = false;

export function initAnalytics(): void {
  if (initialized || typeof window === 'undefined') return;
  initialized = true;
  const key = process.env.NEXT_PUBLIC_POSTHOG_KEY;
  if (!key) return;
  posthog.init(key, {
    api_host: process.env.NEXT_PUBLIC_POSTHOG_HOST || 'https://us.i.posthog.com',
    capture_pageview: false,
    persistence: 'localStorage+cookie',
    autocapture: false,
    loaded: (ph) => {
      posthogReady = true;
      if (process.env.NODE_ENV === 'development') ph.debug();
    },
  });
}

function safeCapture(event: string, properties: Record<string, unknown> = {}) {
  if (!posthogReady) return;
  try {
    posthog.capture(event, properties);
  } catch {
    // analytics failures should never break the app
  }
}

export function identifyUser(userId: string, properties: Record<string, unknown> = {}) {
  if (!posthogReady) return;
  try {
    posthog.identify(userId, properties);
  } catch {
    /* noop */
  }
}

export function resetIdentity() {
  if (!posthogReady) return;
  try {
    posthog.reset();
  } catch {
    /* noop */
  }
}

export function trackPageView(path: string) {
  safeCapture('page_viewed', { path });
}

export function trackScanCompleted(data: {
  sport: string;
  player: string;
  stat: string;
  line: number;
  grade: string;
  tier: string;
}) {
  safeCapture('scan_completed', data);
}

export function trackParlayBuilt(data: { legs: number; sports: string[]; grade: string }) {
  safeCapture('parlay_built', data);
}

export function trackUpgradeClicked(data: {
  current_tier: string;
  target_tier: string;
  trigger_location: string;
}) {
  safeCapture('upgrade_clicked', data);
}

export function trackShareCardGenerated(data: { sport: string; grade: string }) {
  safeCapture('share_card_generated', data);
}

export function trackScanLimitHit(data: { current_scan_count: number; tier: string }) {
  safeCapture('scan_limit_hit', data);
}

export function trackSignup(data: { method: string }) {
  safeCapture('signup', data);
}

export function trackLogin(data: { method: string }) {
  safeCapture('login', data);
}