/** Monitoring and analytics integration for TenderHub. */
import type { User } from "@supabase/supabase-js";

// Sentry configuration
const getSentryDsn = () => process.env.NEXT_PUBLIC_SENTRY_DSN;
const isSentryEnabled = () => false; // Disabled for now: !!getSentryDsn() && process.env.NEXT_PUBLIC_SENTRY_ENABLED !== "false";

// PostHog configuration  
const getPosthogKey = () => process.env.NEXT_PUBLIC_POSTHOG_KEY;
const getPosthogHost = () => process.env.NEXT_PUBLIC_POSTHOG_HOST || "https://app.posthog.com";
const isPosthogEnabled = () => false; // Disabled for now: !!getPosthogKey();

// eslint-disable-next-line @typescript-eslint/no-explicit-any
let sentryModule: any = null;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
let posthogClient: any = null;

// eslint-disable-next-line @typescript-eslint/no-explicit-any
async function getSentry(): Promise<any> {
  if (!isSentryEnabled()) return null;
  if (!sentryModule) {
    try {
      // @ts-ignore -- optional dependency, loaded at runtime
      sentryModule = await import("@sentry/nextjs");
    } catch {
      console.warn("Sentry not installed");
      return null;
    }
  }
  return sentryModule;
}

// eslint-disable-next-line @typescript-eslint/no-explicit-any
async function getPostHog(): Promise<any> {
  if (!isPosthogEnabled()) return null;
  if (!posthogClient) {
    try {
      // eslint-disable-next-line @typescript-eslint/no-explicit-any
      // @ts-ignore -- optional dependency, loaded at runtime
      const posthog = await import("posthog-js") as any;
      posthogClient = posthog.default.init(getPosthogKey()!, {
        api_host: getPosthogHost(),
        capture_pageview: true,
        capture_pageleave: true,
        persistence: "localStorage",
        loaded: (ph: { opt_out_capturing: () => void }) => {
          if (process.env.NODE_ENV === "development") {
            ph.opt_out_capturing();
          }
        },
      });
    } catch {
      console.warn("PostHog not installed");
      return null;
    }
  }
  return posthogClient;
}

// Error tracking
export async function captureException(error: Error, context?: Record<string, unknown>): Promise<void> {
  console.error("[Error]", error, context);
  
  const sentry = await getSentry();
  if (sentry) {
    if (context) {
      sentry.withScope((scope: any) => {
        Object.entries(context).forEach(([key, value]) => {
          scope.setExtra(key, value);
        });
        scope.captureException(error);
      });
    } else {
      sentry.captureException(error);
    }
  }
}

export async function captureMessage(message: string, level: "info" | "warning" | "error" = "info", context?: Record<string, unknown>): Promise<void> {
  console.log(`[${level.toUpperCase()}]`, message, context);
  
  const sentry = await getSentry();
  if (sentry) {
    if (context) {
      sentry.withScope((scope: any) => {
        Object.entries(context).forEach(([key, value]) => {
          scope.setExtra(key, value);
        });
        scope.captureMessage(message, level);
      });
    } else {
      sentry.captureMessage(message, level);
    }
  }
}

// User identification
export async function identifyUser(user: User, organizationId?: string): Promise<void> {
  const posthog = await getPostHog();
  if (posthog) {
    posthog.identify(user.id, {
      email: user.email,
      organizationId,
    });
  }
  
  const sentry = await getSentry();
  if (sentry) {
    sentry.setUser({
      id: user.id,
      email: user.email,
    });
    if (organizationId) {
      sentry.setTag("organizationId", organizationId);
    }
  }
}

export async function resetUser(): Promise<void> {
  const posthog = await getPostHog();
  if (posthog) {
    posthog.reset();
  }
  
  const sentry = await getSentry();
  if (sentry) {
    sentry.setUser(null);
  }
}

// Event tracking
export async function trackEvent(
  eventName: string,
  properties?: Record<string, unknown>
): Promise<void> {
  console.log("[Analytics]", eventName, properties);
  
  const posthog = await getPostHog();
  if (posthog) {
    posthog.capture(eventName, properties);
  }
}

// Product analytics events
export const AnalyticsEvents = {
  // Auth
  USER_SIGNUP: "user_signup",
  USER_LOGIN: "user_login",
  USER_LOGOUT: "user_logout",
  
  // Tenders
  TENDER_UPLOADED: "tender_uploaded",
  TENDER_PROCESSING_STARTED: "tender_processing_started",
  TENDER_ANALYSIS_VIEWED: "tender_analysis_viewed",
  TENDER_UNLOCKED: "tender_unlocked",
  
  // Drafts
  DRAFT_GENERATED: "draft_generated",
  DRAFT_EXPORTED: "draft_exported",
  DRAFT_DOWNLOADED: "draft_downloaded",
  
  // Payments
  PAYMENT_INITIATED: "payment_initiated",
  PAYMENT_COMPLETED: "payment_completed",
  PAYMENT_FAILED: "payment_failed",
  
  // Company Profile
  PROFILE_COMPLETED: "profile_completed",
  PROFILE_UPDATED: "profile_updated",
  
  // Errors
  EXTRACTION_FAILED: "extraction_failed",
  DRAFT_GENERATION_FAILED: "draft_generation_failed",
  UPLOAD_FAILED: "upload_failed",
} as const;

// Breadcrumbs for debugging
export async function addBreadcrumb(
  message: string,
  category?: string,
  data?: Record<string, unknown>
): Promise<void> {
  const sentry = await getSentry();
  if (sentry) {
    sentry.addBreadcrumb({
      message,
      category,
      data,
      level: "info",
    });
  }
}

// Performance monitoring
export async function startSpanSafe(
  name: string,
  op: string
): Promise<{ finish: () => void } | null> {
  const sentry = await getSentry();
  if (!sentry) return null;

  // Use startSpan if available (Sentry v8+), otherwise no-op
  if (typeof sentry.startSpan === "function") {
    try {
      sentry.startSpan({ name, op }, () => {});
    } catch {
      // Span API may not be available in all builds
    }
  }

  // Return a no-op handle for backward compatibility
  return { finish: () => {} };
}

// Initialize monitoring on app start
export async function initMonitoring(): Promise<void> {
  if (isSentryEnabled()) {
    await getSentry();
    console.log("[Monitoring] Sentry initialized");
  }
  if (isPosthogEnabled()) {
    await getPostHog();
    console.log("[Monitoring] PostHog initialized");
  }
}