import type { FallbackReviewIndex, FlaggedFileRecord, ShellActivityRecord } from "./types";

export const EMPTY_HANDOFF = "no fallback changes are pending";

const GROUND_TRUTH_LINES = [
  "  ground truth: inspect the current working-tree diff (git status / git diff) —",
  "    shell mutations are not attributable per file; the diff is authoritative.",
] as const;

export function pendingReviewCount(index: Pick<FallbackReviewIndex, "flaggedFiles" | "reviewed">): number {
  return index.reviewed ? 0 : index.flaggedFiles.length;
}

// OD-11 / DC-4: record always, render as a suffix on the flagged-file line — no separate section, no
// reordering, no second handoff format. Gated on `=== 2` so a tier-1 record and a record written before
// the field existed both render byte-for-byte as they always did. Shell records get nothing (NG-9/AC-20).
const tierSuffix = (file: FlaggedFileRecord): string => file.tier === 2 ? " (tier 2 assistant)" : "";

function renderFlaggedFiles(files: readonly FlaggedFileRecord[]): string[] {
  return [
    "  flagged files:",
    ...files.map((file, position) => `    ${position + 1}. ${file.path}   ← ${file.model}${tierSuffix(file)}   ${file.timestamp}`),
  ];
}

function renderShellActivity(activity: readonly ShellActivityRecord[]): string[] {
  return [
    "  shell activity (UNATTRIBUTED — no file-level attribution claimed):",
    ...activity.map((record) => `    - ${JSON.stringify(record.command)}        (tool-call ${record.toolCallId})`),
  ];
}

export function renderHandoff(index: FallbackReviewIndex): string {
  if (index.reviewed || (index.flaggedFiles.length === 0 && index.shellActivity.length === 0)) return EMPTY_HANDOFF;

  const lines = [
    `fallback review — episode ${index.episodeId}`,
    `  root primary : ${index.primary}`,
    `  status       : ${index.status}            pending changes: ${pendingReviewCount(index)}`,
  ];

  if (index.flaggedFiles.length > 0) lines.push(...renderFlaggedFiles(index.flaggedFiles));
  if (index.shellActivity.length > 0) lines.push(...renderShellActivity(index.shellActivity));
  lines.push(...GROUND_TRUTH_LINES);
  return lines.join("\n");
}