export const PAYMENT_ANALYTICS_ENTRY_PARAM = "analytics_entry";
export const PAYMENT_ANALYTICS_REASON_PARAM = "analytics_reason";

export type PaymentAnalyticsTriggerReason =
  | "daily_chat_limit"
  | "private_topic_limit"
  | "insufficient_credits"
  | "profile_recharge"
  | "vip_cta"
  | "ad_landing"
  | "manual_recharge"
  | "unknown";

export type PaymentAnalyticsEntryPoint =
  | "chat_input"
  | "chat_unlock"
  | "private_album_unlock"
  | "private_zone"
  | "profile"
  | "chat_offer_banner"
  | "subscription_direct"
  | "tip_page"
  | "external_entry"
  | "unknown";

export interface PaymentAnalyticsContext {
  entryPoint: PaymentAnalyticsEntryPoint;
  triggerReason: PaymentAnalyticsTriggerReason;
}

const ENTRY_POINTS = new Set<PaymentAnalyticsEntryPoint>([
  "chat_input",
  "chat_unlock",
  "private_album_unlock",
  "private_zone",
  "profile",
  "chat_offer_banner",
  "subscription_direct",
  "tip_page",
  "external_entry",
  "unknown",
]);

const TRIGGER_REASONS = new Set<PaymentAnalyticsTriggerReason>([
  "daily_chat_limit",
  "private_topic_limit",
  "insufficient_credits",
  "profile_recharge",
  "vip_cta",
  "ad_landing",
  "manual_recharge",
  "unknown",
]);

export function getDefaultPaymentAnalyticsContext(
  type: "vip" | "topup",
): PaymentAnalyticsContext {
  return {
    entryPoint: "subscription_direct",
    triggerReason: type === "topup" ? "manual_recharge" : "vip_cta",
  };
}

export function parsePaymentAnalyticsContext(input: {
  entryPoint: string | null;
  triggerReason: string | null;
  subscriptionType: "vip" | "topup";
}): PaymentAnalyticsContext {
  const fallback = getDefaultPaymentAnalyticsContext(input.subscriptionType);
  return {
    entryPoint: ENTRY_POINTS.has(input.entryPoint as PaymentAnalyticsEntryPoint)
      ? (input.entryPoint as PaymentAnalyticsEntryPoint)
      : fallback.entryPoint,
    triggerReason: TRIGGER_REASONS.has(
      input.triggerReason as PaymentAnalyticsTriggerReason,
    )
      ? (input.triggerReason as PaymentAnalyticsTriggerReason)
      : fallback.triggerReason,
  };
}