export const HAL_CONFIGURATION_SCHEMA = "hal-configuration-preflight.v1";

const BUILTIN_THREADS = new Set(["servo-thread", "base-thread"]);

function text(value) {
  return typeof value === "string" && value.length > 0 ? value : null;
}

export function parseHalLine(raw, line = 0) {
  if (typeof raw !== "string") return { status: "blocked", code: "hal_line_invalid", line };
  const clean = raw.split("#", 1)[0].trim();
  if (!clean) return null;
  const tokens = clean.split(/\s+/);
  const command = tokens[0];
  if (!["loadrt", "loadusr", "addf", "net", "setp", "source", "newsig", "linksp", "linkps", "linkpp"].includes(command)) return null;
  if (command === "loadrt") {
    const module = tokens[1] ?? "";
    const namesToken = tokens.find((token) => token.startsWith("names="));
    return { schema: HAL_CONFIGURATION_SCHEMA, line, command, module, instances: namesToken ? namesToken.slice(6).split(",") : [], status: module.startsWith("[") ? "blocked" : "declared", code: module.startsWith("[") ? "hal_component_variable" : null };
  }
  if (command === "loadusr") return { schema: HAL_CONFIGURATION_SCHEMA, line, command, status: "blocked", code: "hal_host_dynamic_loader", program: tokens[1] ?? "" };
  if (command === "addf") {
    const thread = tokens[2] ?? "";
    return { schema: HAL_CONFIGURATION_SCHEMA, line, command, function: tokens[1] ?? null, thread, status: text(thread) && BUILTIN_THREADS.has(thread) ? "checked" : "blocked", code: text(thread) && BUILTIN_THREADS.has(thread) ? null : "hal_thread_undeclared" };
  }
  return { schema: HAL_CONFIGURATION_SCHEMA, line, command, tokens: tokens.slice(1), status: "checked", code: null };
}

export function preflightHalConfiguration({ lines = [], manifest = [] } = {}) {
  const declared = new Set((Array.isArray(manifest) ? manifest : []).map((row) => row?.component).filter(Boolean));
  const records = [];
  for (let index = 0; index < lines.length; index += 1) {
    const parsed = parseHalLine(lines[index], index + 1);
    if (!parsed) continue;
    if (parsed.command === "loadrt" && parsed.status === "declared" && !declared.has(parsed.module)) {
      parsed.status = "blocked";
      parsed.code = "hal_component_undeclared";
    }
    records.push(parsed);
  }
  const blocked = records.filter((record) => record.status === "blocked");
  return {
    schema: HAL_CONFIGURATION_SCHEMA,
    status: blocked.length === 0 ? "ready" : "blocked",
    records,
    record_count: records.length,
    blocked_count: blocked.length,
  };
}