import type { PrHint } from "@/git/pr-hint";
import type { SidebarRowItems } from "@/components/sidebar/display-preferences/row-items";
import { selectCheckSummary, type CheckSummary } from "./check-summary";
import type { WorkspaceScriptSummary } from "./script-summary";

/**
 * What ends up on the line under a workspace title, in the order it is read: where the
 * workspace lives, what change it belongs to, whether that change is passing, and what it is
 * running. Identity first, then the work, then the work's state.
 */
export type MetaRowItem =
  | { kind: "host" }
  | { kind: "changeRequest"; hint: PrHint }
  | { kind: "checks"; summary: CheckSummary }
  | { kind: "scripts"; summary: WorkspaceScriptSummary };

/**
 * Which peers a row should draw, given what it knows and what the user left switched on.
 *
 * Kept out of the component because this — not the markup — is the part with rules in it: every
 * toggle answers for itself, so a row can end up showing checks with no change request beside
 * them, and CI resolves from the hint even when the hint itself is not drawn.
 *
 * The host is filtered upstream, where the badge map is built: a host that should show nothing
 * has no badge to hand down, so by the time a row sees one it is meant to be drawn.
 */
export function selectMetaRowItems(input: {
  hasHostBadge: boolean;
  prHint: PrHint | null;
  scriptSummary: WorkspaceScriptSummary | null;
  visible: SidebarRowItems;
}): MetaRowItem[] {
  const { hasHostBadge, prHint, scriptSummary, visible } = input;
  const items: MetaRowItem[] = [];

  if (hasHostBadge) {
    items.push({ kind: "host" });
  }
  if (prHint && visible.changeRequest) {
    items.push({ kind: "changeRequest", hint: prHint });
  }

  // Independent of the change request, even though checks are read off one. Tying them together
  // meant the checks toggle could sit ticked while nothing was drawn, which is a switch that lies
  // about its own state. Showing checks without the change request beside them is the stranger
  // combination, but it is the one you asked for and it is what you get.
  if (visible.checks) {
    const summary = selectCheckSummary(prHint);
    if (summary) {
      items.push({ kind: "checks", summary });
    }
  }

  if (scriptSummary && visible.scripts) {
    items.push({ kind: "scripts", summary: scriptSummary });
  }

  return items;
}