import { HttpError, type RequestContext } from '../../core/http.js';
import { queryOne } from '../../core/db.js';
import { tenantIdFrom, userIdFrom } from '../../core/request.js';

const TENANT_ADMIN_ROLES = new Set([
  'tenant_owner',
  'tenant_admin',
  'tenant_operator',
  'teacher',
  'sales',
  'agent',
]);
const ROLE_PERMISSION_DEFAULTS: Record<string, string[]> = {
  tenant_owner: ['*'],
  tenant_admin: ['*'],
  tenant_operator: ['content:*', 'marketing:*', 'codes:read', 'coupons:read', 'referral:read', 'crm:read'],
  teacher: ['content:*'],
  sales: ['codes:*', 'coupons:*', 'referral:*'],
  agent: ['codes:read', 'coupons:read', 'referral:self'],
  student: [],
};

export interface TenantAdminAuth {
  tenantId: string;
  userId: string;
  role: string;
  permissions: Record<string, unknown>;
}

function permissionKeys(permission: string) {
  const parts = permission.split(':').filter(Boolean);
  const keys = [permission];
  for (let i = parts.length - 1; i >= 1; i -= 1) {
    keys.push(`${parts.slice(0, i).join(':')}:*`);
  }
  keys.push('*');
  return keys;
}

function explicitPermission(permissions: Record<string, unknown>, permission: string) {
  for (const key of permissionKeys(permission)) {
    const value = permissions[key];
    if (typeof value === 'boolean') return value;
  }
  return null;
}

export function hasTenantPermission(auth: TenantAdminAuth, permission: string) {
  const explicit = explicitPermission(auth.permissions, permission);
  if (explicit !== null) return explicit;

  const defaults = ROLE_PERMISSION_DEFAULTS[auth.role] || [];
  return defaults.some(defaultPermission => {
    if (defaultPermission === '*') return true;
    if (defaultPermission === permission) return true;
    if (defaultPermission.endsWith(':*')) {
      return permission.startsWith(defaultPermission.slice(0, -1));
    }
    return false;
  });
}

export function requireTenantPermission(auth: TenantAdminAuth, permission: string) {
  if (!hasTenantPermission(auth, permission)) {
    throw new HttpError(403, `Tenant permission is required: ${permission}`, 'TENANT_PERMISSION_REQUIRED');
  }
}

export function tenantPermissionCatalog() {
  return {
    permissions: [
      { key: 'tenant:overview:read', label: '租户概览' },
      { key: 'tenant:branding:write', label: '品牌配置' },
      { key: 'tenant:settings:write', label: '公开设置' },
      { key: 'tenant:domains:read', label: '域名查看' },
      { key: 'tenant:domains:write', label: '域名管理' },
      { key: 'tenant:payment:read', label: '商户配置查看' },
      { key: 'tenant:payment:write', label: '商户配置管理' },
      { key: 'tenant:auth:read', label: '登录配置查看' },
      { key: 'tenant:auth:write', label: '登录配置管理' },
      { key: 'tenant:secrets:read', label: '密钥掩码查看' },
      { key: 'tenant:secrets:write', label: '密钥轮换' },
      { key: 'marketing:read', label: '活动内容查看' },
      { key: 'marketing:write', label: '活动内容管理' },
      { key: 'codes:read', label: '激活码查看' },
      { key: 'codes:write', label: '激活码管理' },
      { key: 'coupons:read', label: '优惠券查看' },
      { key: 'coupons:write', label: '优惠券管理' },
      { key: 'referral:read', label: '客资全局查看' },
      { key: 'referral:self', label: '本人客资查看' },
      { key: 'referral:write', label: '客资归属管理' },
      { key: 'crm:read', label: 'CRM 队列查看' },
      { key: 'crm:write', label: 'CRM 入队和重试' },
      { key: 'members:read', label: '成员查看' },
      { key: 'members:write', label: '成员管理' },
      { key: 'audit:read', label: '审计日志查看' },
      { key: 'content:*', label: '内容维护' },
    ],
    roleDefaults: ROLE_PERMISSION_DEFAULTS,
  };
}

export async function requireTenantAdmin(ctx: RequestContext): Promise<TenantAdminAuth> {
  const tenantId = tenantIdFrom(ctx);
  const userId = userIdFrom(ctx);

  const membership = await queryOne<{ role: string; permissions: Record<string, unknown> }>(
    `
    select role, permissions
    from public.tenant_memberships
    where tenant_id = $1
      and user_id = $2
      and status = 'active'
      and role = any($3::text[])
    order by case role
      when 'tenant_owner' then 1
      when 'tenant_admin' then 2
      else 9
    end
    limit 1
    `,
    [tenantId, userId, Array.from(TENANT_ADMIN_ROLES)],
  );

  if (!membership) {
    throw new HttpError(403, 'Tenant admin access is required', 'TENANT_ADMIN_REQUIRED');
  }

  return { tenantId, userId, role: membership.role, permissions: membership.permissions || {} };
}