export type BuildReviewProgressInput = {
  blocking: number;
  individualRequired: number;
  individualReviewed: number;
  groupRequired: number;
  reviewComplete: boolean;
};

export type BuildReviewProgress = {
  blocking: number;
  individualRequired: number;
  individualReviewed: number;
  individualRemaining: number;
  groupRequired: number;
  groupReviewed: number;
  groupRemaining: number;
  required: number;
  reviewed: number;
  remaining: number;
};

function count(value: number): number {
  return Number.isFinite(value) ? Math.max(0, Math.trunc(value)) : 0;
}

export function calculateBuildReviewProgress(input: BuildReviewProgressInput): BuildReviewProgress {
  const blocking = count(input.blocking);
  const individualRequired = count(input.individualRequired);
  const groupRequired = count(input.groupRequired);
  const individualReviewed = input.reviewComplete
    ? individualRequired
    : Math.min(individualRequired, count(input.individualReviewed));
  const groupReviewed = input.reviewComplete ? groupRequired : 0;
  const individualRemaining = individualRequired - individualReviewed;
  const groupRemaining = groupRequired - groupReviewed;

  return {
    blocking,
    individualRequired,
    individualReviewed,
    individualRemaining,
    groupRequired,
    groupReviewed,
    groupRemaining,
    required: individualRequired + groupRequired,
    reviewed: individualReviewed + groupReviewed,
    remaining: individualRemaining + groupRemaining
  };
}

/** Summary match counts describe inputs; they are not fresh review gates. */
export function attachmentDeliveryPreflight(input: {
  migrationRequired: boolean;
  hasBuild: boolean;
  reviewLoaded: boolean;
  blocking: number;
  remaining: number;
  inspectionComplete: boolean;
  missing: number;
  ambiguous: number;
}): { state: "ready" | "warning" | "blocked" | "info"; detail: string } {
  if (input.migrationRequired) return { state: "blocked", detail: "i18n:govoplan-campaign.attachment_checks_await_mail_migration" };
  if (!input.hasBuild) return { state: "info", detail: "i18n:govoplan-campaign.attachment_preflight_build_first" };
  if (!input.reviewLoaded) return { state: "info", detail: "i18n:govoplan-campaign.attachment_preflight_loading" };
  if (input.blocking > 0) return { state: "blocked", detail: "i18n:govoplan-campaign.attachment_preflight_blocked" };
  if (input.inspectionComplete || input.remaining === 0) {
    return { state: "ready", detail: "i18n:govoplan-campaign.attachment_preflight_satisfied" };
  }
  if (input.missing + input.ambiguous > 0) {
    return { state: "warning", detail: "i18n:govoplan-campaign.attachment_preflight_review" };
  }
  return { state: "info", detail: "i18n:govoplan-campaign.attachment_preflight_pending" };
}