const fs = require("fs");
const { resolveData, ensureDataDirs } = require("./paths");

const DEFAULT_CONFIG = {
  enabled: false,
  selected_model_id: "qwen3-1.7b-q4",
  context_size: 4096,
  threads: 0,
  concurrency: 1,
  max_queue_length: 8,
  request_timeout_ms: 120000,
  per_user_requests_per_minute: 6,
  admin_bypass_rate_limit: false,
  assistant_visibility: { admins: true, mods: false, users: false },
  instructions: {
    identity: "You are Lumi Assistant, a concise assistant for this Lumi bot and community.",
    style: "Be brief, factual, and provide internal WebUI links when known.",
    allowed_topics: "Lumi, its WebUI, plugins, community systems, streams, and videos.",
    out_of_scope_response: "I am sorry, but that is outside my scope.",
    maximum_answer_length: 700,
    roleplay_intensity: 0,
    community_tone: "",
    admin_custom: ""
  },
  logging: {
    log_prompts: false,
    log_responses: false,
    log_tool_calls: true,
    log_metrics: true,
    log_internal_audit: true
  }
};

function readJson(name, fallback) {
  ensureDataDirs();
  const file = resolveData("config", name);
  if (!fs.existsSync(file)) {
    writeJson(name, fallback);
    return structuredClone(fallback);
  }
  try { return { ...structuredClone(fallback), ...JSON.parse(fs.readFileSync(file, "utf8")) }; }
  catch { return structuredClone(fallback); }
}
function writeJson(name, value) {
  const file = resolveData("config", name);
  const tmp = `${file}.tmp`;
  fs.writeFileSync(tmp, `${JSON.stringify(value, null, 2)}\n`);
  fs.renameSync(tmp, file);
}
function getConfig() { return readJson("ai_config.json", DEFAULT_CONFIG); }
function saveConfig(value) {
  const merged = { ...DEFAULT_CONFIG, ...value };
  merged.assistant_visibility = { ...DEFAULT_CONFIG.assistant_visibility, ...(value.assistant_visibility || {}) };
  merged.instructions = { ...DEFAULT_CONFIG.instructions, ...(value.instructions || {}) };
  merged.logging = { ...DEFAULT_CONFIG.logging, ...(value.logging || {}) };
  writeJson("ai_config.json", merged);
  return merged;
}
function getRuntimeState() {
  return readJson("runtime_state.json", {
    desired_state: "stopped", last_known_state: "stopped", last_stop_reason: "never_started",
    last_manual_stop: true, last_crashed: false, last_exit_code: null,
    last_diagnostic_category: null, selected_model_id: null, updated_at: new Date().toISOString()
  });
}
function saveRuntimeState(value) { writeJson("runtime_state.json", { ...value, updated_at: new Date().toISOString() }); }

module.exports = { DEFAULT_CONFIG, getConfig, saveConfig, getRuntimeState, saveRuntimeState, readJson, writeJson };