const AUTOMATION_TYPES = {
  ACCEPT: "AUTO_ACCEPT",
  OPEN_RX: "AUTO_OPEN_RX",
  PASS_RX: "AUTO_PASS_RX",
};

const DEFAULT_AUTOMATION_CONFIG = {
  autoAcceptOrder: false,
  autoOpenRx: false,
  autoPassRx: false,
  // Preserve the existing behaviour for institutions with no saved value.
  enableRationalDrug: true,
  autoAcceptDelayMinSeconds: 2,
  autoAcceptDelayMaxSeconds: 5,
  autoOpenRxDelayMinSeconds: 20,
  autoOpenRxDelayMaxSeconds: 40,
  autoPassRxDelayMinSeconds: 10,
  autoPassRxDelayMaxSeconds: 30,
};

const TYPE_CONFIG = {
  [AUTOMATION_TYPES.ACCEPT]: {
    enabledKey: "autoAcceptOrder",
    minKey: "autoAcceptDelayMinSeconds",
    maxKey: "autoAcceptDelayMaxSeconds",
  },
  [AUTOMATION_TYPES.OPEN_RX]: {
    enabledKey: "autoOpenRx",
    minKey: "autoOpenRxDelayMinSeconds",
    maxKey: "autoOpenRxDelayMaxSeconds",
  },
  [AUTOMATION_TYPES.PASS_RX]: {
    enabledKey: "autoPassRx",
    minKey: "autoPassRxDelayMinSeconds",
    maxKey: "autoPassRxDelayMaxSeconds",
  },
};

const AUTOMATION_DELAY_KEYS = [
  "autoAcceptDelayMinSeconds",
  "autoAcceptDelayMaxSeconds",
  "autoOpenRxDelayMinSeconds",
  "autoOpenRxDelayMaxSeconds",
  "autoPassRxDelayMinSeconds",
  "autoPassRxDelayMaxSeconds",
];

const AUTOMATION_DELAY_PAIRS = [
  ["autoAcceptDelayMinSeconds", "autoAcceptDelayMaxSeconds"],
  ["autoOpenRxDelayMinSeconds", "autoOpenRxDelayMaxSeconds"],
  ["autoPassRxDelayMinSeconds", "autoPassRxDelayMaxSeconds"],
];

function normalizeNonNegativeInteger(value, fallback) {
  return Number.isInteger(value) && value >= 0 ? value : fallback;
}

function normalizeAutomationConfig(config = {}) {
  const result = {
    ...DEFAULT_AUTOMATION_CONFIG,
    ...config,
  };

  Object.values(TYPE_CONFIG).forEach(({ minKey, maxKey }) => {
    const defaultMin = DEFAULT_AUTOMATION_CONFIG[minKey];
    const defaultMax = DEFAULT_AUTOMATION_CONFIG[maxKey];
    result[minKey] = normalizeNonNegativeInteger(config[minKey], defaultMin);
    result[maxKey] = normalizeNonNegativeInteger(config[maxKey], defaultMax);
    if (result[minKey] > result[maxKey]) {
      result[minKey] = defaultMin;
      result[maxKey] = defaultMax;
    }
  });

  result.autoAcceptOrder = config.autoAcceptOrder === true;
  result.autoOpenRx = config.autoOpenRx === true;
  result.autoPassRx = config.autoPassRx === true;
  result.enableRationalDrug = config.enableRationalDrug !== false;
  return result;
}

function getTypeConfig(config, type) {
  const normalized = normalizeAutomationConfig(config);
  const mapping = TYPE_CONFIG[type];
  if (!mapping) {
    throw new Error(`未知自动化任务类型: ${type}`);
  }
  return {
    enabled: normalized[mapping.enabledKey] === true,
    minSeconds: normalized[mapping.minKey],
    maxSeconds: normalized[mapping.maxKey],
  };
}

function randomInteger(min, max, random = Math.random) {
  if (min === max) return min;
  return Math.floor(random() * (max - min + 1)) + min;
}

function validateAutomationDelayConfig(input = {}, current = {}) {
  const data = {};
  for (const key of AUTOMATION_DELAY_KEYS) {
    if (key in input) {
      if (!Number.isInteger(input[key]) || input[key] < 0 || input[key] > 3600) {
        return {
          success: false,
          message: `${key}必须是0到3600之间的整数`,
        };
      }
      data[key] = input[key];
    }
  }

  const merged = {
    ...normalizeAutomationConfig(current),
    ...data,
  };
  for (const [minKey, maxKey] of AUTOMATION_DELAY_PAIRS) {
    if (merged[minKey] > merged[maxKey]) {
      return {
        success: false,
        message: `${minKey}不能大于${maxKey}`,
      };
    }
  }
  return { success: true, data };
}

module.exports = {
  AUTOMATION_TYPES,
  DEFAULT_AUTOMATION_CONFIG,
  TYPE_CONFIG,
  AUTOMATION_DELAY_KEYS,
  AUTOMATION_DELAY_PAIRS,
  normalizeAutomationConfig,
  getTypeConfig,
  randomInteger,
  validateAutomationDelayConfig,
};