// Plain-text views of broker results. Every function takes what the broker
// returned and keeps its order: the broker sorts, this file never re-sorts.

const one = (s, max = 160) => {
  const flat = String(s ?? "").replace(/\s+/g, " ").trim();
  return flat.length > max ? `${flat.slice(0, max - 1)}…` : flat;
};

export const shortId = (id) => String(id).slice(0, 8);

export function optionsLine(d) {
  return d.options.map((o) => `${o.key} = ${one(o.text, 80)}`).join("; ");
}

// What approving means, when the decision carries authorization context.
export function authorizationLines(d) {
  const a = d.authorization;
  if (!a) return [];
  const lines = [`action: ${a.action}${a.target ? ` on ${a.target}` : ""}`];
  lines.push(`choosing "${a.approvalChoice}" authorizes it; any other choice declines`);
  return lines;
}

export function formatInbox(list) {
  if (list.length === 0) return "inbox: empty\n";
  const out = [`inbox: ${list.length} open decision(s)`];
  for (const d of list) {
    const flags = [d.class, d.blocking ? "blocking" : null].filter(Boolean).join(", ");
    out.push("", `${shortId(d.id)}  ${d.action}  (${flags})  raised ${d.at} by ${d.raised_by_role}`);
    out.push(`  ${one(d.question, 400)}`);
    out.push(`  options: ${optionsLine(d)}  (recommended: ${d.recommendation})`);
    for (const l of authorizationLines(d)) out.push(`  ${l}`);
    if (d.task_ref) out.push(`  task: ${d.task_ref}`);
    out.push(`  decide: mosaic decide ${shortId(d.id)} <option>`);
  }
  return `${out.join("\n")}\n`;
}

export function formatDecision(d) {
  const out = [
    `decision ${d.id}`,
    `  ${d.class}${d.blocking ? ", blocking" : ""}, raised ${d.at} by ${d.raised_by_role} (${d.raised_by_run})`,
    `  question: ${d.question}`,
    `  options: ${optionsLine(d)}`,
    `  recommended: ${d.recommendation}`,
  ];
  for (const l of authorizationLines(d)) out.push(`  ${l}`);
  if (d.task_ref) out.push(`  task: ${d.task_ref}`);
  return `${out.join("\n")}\n`;
}

export function formatAgents(list) {
  if (list.length === 0) return "agents: no role is claimed\n";
  return `${list.map((c) => `${c.role}  ${c.holder_run}  ${c.harness ?? "-"}  since ${c.at}`).join("\n")}\n`;
}

export function formatTasks(list) {
  if (list.length === 0) return "tasks: none\n";
  return `${list
    .map((t) => {
      const f = t.fields ?? {};
      const title = f.title ?? f.name ?? "";
      const state = f.status ?? f.state ?? (f.done === true ? "done" : f.done === false ? "open" : "");
      return [t.task_ref, state, one(title, 100)].filter(Boolean).join("  ");
    })
    .join("\n")}\n`;
}

function trailSummary(r) {
  switch (r.table) {
    case "events":
      return [r.kind, r.actor_role ?? null, r.body?.operation ?? null, r.body?.decision ? `decision ${shortId(r.body.decision)}` : null].filter(Boolean).join("  ");
    case "decisions":
      return `${r.class} ${r.action} → ${r.route_to}${r.blocking ? " (blocking)" : ""}: ${one(r.question, 120)}`;
    case "decision_events":
      return [r.op, r.choice ? `choice ${r.choice}` : null, `by ${r.by}`, r.via ? `via ${r.via}` : null].filter(Boolean).join("  ");
    case "messages":
      return `${r.from_role} → ${r.to_role}: ${one(r.body, 120)}`;
    case "deliveries":
      return [r.op, r.transport, r.holder_run].filter(Boolean).join("  ");
    case "role_claims":
      return `${r.op} ${r.role} by ${r.holder_run}`;
    case "task_snapshots":
      return `snapshot ${r.task_ref ?? ""}`.trim();
    default:
      return "";
  }
}

// Rows print in the order the broker returned them (at, table, seq).
export function formatTrail(subject, rows) {
  const out = [`trail ${subject}: ${rows.length} row(s)`];
  for (const r of rows) out.push(`${r.at}  ${r.table}#${r.seq}  ${trailSummary(r)}`.trimEnd());
  const decision = rows.find((r) => r.table === "decisions" && r.id === subject);
  if (decision?.task_ref) out.push("", `task: ${decision.task_ref}`, `follow with: mosaic trail ${decision.task_ref}`);
  return `${out.join("\n")}\n`;
}