import type { JsonValue } from "./types";

function text(value: JsonValue | undefined): string {
  return value === undefined || value === null ? "" : String(value);
}

/** Timeline copy for pull request review and merge-automation events. */
export function pullEventText(kind: string, data: { [key: string]: JsonValue }): string | null {
  switch (kind) {
    case "review_dismissed":
      return `dismissed a review: ${text(data.reason)}`;
    case "issue_linked":
      return `linked issue #${text(data.number)}`;
    case "issue_unlinked":
      return `unlinked issue #${text(data.number)}`;
    case "auto_merge_enabled":
      return `enabled auto-merge (${text(data.method)})`;
    case "auto_merge_disabled":
      return data.reason ? `auto-merge was disabled: ${text(data.reason)}` : "disabled auto-merge";
    case "added_to_merge_queue":
      return "added this to the merge queue";
    case "removed_from_merge_queue":
      return data.reason
        ? `was removed from the merge queue: ${text(data.reason)}`
        : "removed this from the merge queue";
    default:
      return null;
  }
}