// ═══════════════════════════════════════
// 铸渊开发Agent · 成本守卫 + 统一插座 v1.0
// API调用计数 · 预算控制 · 输出格式校验
// ═══════════════════════════════════════

const fs = require("fs");
const path = require("path");

const CONSTITUTION = JSON.parse(fs.readFileSync(path.join(__dirname, "..", "agent-constitution.json"), "utf-8"));
const { cost_guard, unified_interface } = CONSTITUTION;

let _callCount = 0;
let _budgetExceeded = false;

function reset() {
  _callCount = 0;
  _budgetExceeded = false;
}

function getCallCount() { return _callCount; }

function isBudgetExceeded() { return _budgetExceeded; }

/**
 * 包裹模型调用——自动计数
 */
function wrapModelCaller(rawCaller) {
  return async function(prompt, opts) {
    if (_budgetExceeded) {
      throw new Error(cost_guard.stop_message);
    }

    _callCount++;

    if (_callCount > cost_guard.max_api_calls_per_session) {
      _budgetExceeded = true;
      throw new Error(cost_guard.stop_message + " (已用 " + _callCount + " 次，上限 " + cost_guard.max_api_calls_per_session + ")");
    }

    console.log("[CostGuard] API调用 #" + _callCount + "/" + cost_guard.max_api_calls_per_session);
    return rawCaller(prompt, opts);
  };
}

/**
 * 统一校验——每个模块输出必须通过这把尺
 */
function validateOutput(output) {
  const required = unified_interface.required_output_fields;
  const missing = required.filter(f => !(f in output));

  if (missing.length > 0) {
    return {
      valid: false,
      error: "输出缺少必要字段: " + missing.join(", "),
      required,
      received: Object.keys(output)
    };
  }

  // 类型校验
  if (typeof output.ok !== "boolean") {
    return { valid: false, error: "ok 必须是 boolean，收到: " + typeof output.ok };
  }

  return { valid: true };
}

module.exports = { wrapModelCaller, validateOutput, reset, getCallCount, isBudgetExceeded };