/**
 * License 数据结构 — 纯本地授权，零 SaaS 依赖
 *
 * 发放流程: CLI 生成 → HMAC 签名 → license.json → 交给客户
 * 验证流程: Gateway 启动 → 读 license.json → 校验签名+过期 → 功能开关
 */

// ========== License 文件结构 ==========

export interface LicensePayload {
  /** License ID (UUID) */
  id: string;

  /** 商户 ID */
  merchantId: string;

  /** 商户名称 */
  merchantName: string;

  /** 套餐等级 */
  plan: LicensePlan;

  /** 功能开关 */
  features: LicenseFeatures;

  /** 配额 */
  quotas: LicenseQuotas;

  /** 发放时间 (ISO 8601) */
  issuedAt: string;

  /** 过期时间 (ISO 8601) */
  expiresAt: string;

  /** 绑定的机器指纹 (可选, 防拷贝) */
  machineId?: string;
}

export interface LicenseFile {
  /** 版本号, 便于未来升级格式 */
  version: 1;

  /** License 载荷 */
  payload: LicensePayload;

  /** HMAC-SHA256 签名 (对 payload JSON 的签名) */
  signature: string;
}

// ========== 套餐 ==========

export type LicensePlan = 'free' | 'basic' | 'pro' | 'enterprise';

// ========== 功能开关 ==========

export interface LicenseFeatures {
  /** FTS5 全文搜索 */
  fts_search: boolean;

  /** 向量搜索 (Phase 2) */
  vector_search: boolean;

  /** 知识同步到 SaaS */
  knowledge_sync: boolean;

  /** 多项目支持 */
  multi_project: boolean;

  /** 自定义模型 */
  custom_model: boolean;
}

// ========== 配额 ==========

export interface LicenseQuotas {
  /** 最大项目数 */
  maxProjects: number;

  /** 每项目最大 Agent 数 */
  maxAgentsPerProject: number;

  /** 月 Token 配额 (-1 = 无限) */
  monthlyTokens: number;

  /** 日消息配额 (-1 = 无限) */
  dailyMessages: number;
}

// ========== 套餐预设 ==========

export const PLAN_PRESETS: Record<LicensePlan, { features: LicenseFeatures; quotas: LicenseQuotas }> = {
  free: {
    features: {
      fts_search: true,
      vector_search: false,
      knowledge_sync: false,
      multi_project: false,
      custom_model: false,
    },
    quotas: {
      maxProjects: 1,
      maxAgentsPerProject: 4,
      monthlyTokens: 100_000,
      dailyMessages: 100,
    },
  },
  basic: {
    features: {
      fts_search: true,
      vector_search: false,
      knowledge_sync: true,
      multi_project: true,
      custom_model: false,
    },
    quotas: {
      maxProjects: 3,
      maxAgentsPerProject: 6,
      monthlyTokens: 1_000_000,
      dailyMessages: 500,
    },
  },
  pro: {
    features: {
      fts_search: true,
      vector_search: true,
      knowledge_sync: true,
      multi_project: true,
      custom_model: true,
    },
    quotas: {
      maxProjects: 10,
      maxAgentsPerProject: -1,
      monthlyTokens: 5_000_000,
      dailyMessages: -1,
    },
  },
  enterprise: {
    features: {
      fts_search: true,
      vector_search: true,
      knowledge_sync: true,
      multi_project: true,
      custom_model: true,
    },
    quotas: {
      maxProjects: -1,
      maxAgentsPerProject: -1,
      monthlyTokens: -1,
      dailyMessages: -1,
    },
  },
};

// ========== 验证结果 ==========

export interface LicenseValidation {
  valid: boolean;
  error?: string;
  payload?: LicensePayload;
  /** 剩余天数 (-1 = 已过期) */
  daysRemaining: number;
  /** 是否在宽限期 (过期 7 天内) */
  inGracePeriod: boolean;
}