import assert from "node:assert/strict";
import test from "node:test";

import { adminErrorResponse } from "../src/lib/admin/admin-error-response.ts";
import {
  AdminAuthorizationError,
  authorizeAdminRequest,
  type AdminAuthorizationDependencies,
  type AdminSession,
} from "../src/lib/admin/auth-boundary.ts";
import { authorizeAdminAccess } from "../src/lib/admin/auth-policy.ts";
import type { IdentityUser } from "../src/modules/identity/contracts.ts";
import {
  IdentityAuthorizationError,
  type IdentityServerSession,
} from "../src/modules/identity/session.ts";

function user(): IdentityUser {
  return {
    id: "11111111-1111-4111-8111-111111111111",
    email: "admin@example.com",
    emailVerified: true,
    twoFactorEnabled: false,
    name: "Admin",
    image: null,
    role: ["user"],
  };
}

function identitySession(): IdentityServerSession {
  return {
    user: user(),
    sessionId: "session-id",
    sessionToken: "session-token",
    expiresAt: new Date("2026-08-08T00:00:00.000Z"),
  };
}

function adminSession(): AdminSession {
  const identity = identitySession();
  return {
    user: identity.user,
    roles: ["owner"],
    permissions: ["admin.access"],
    requiresMfa: false,
    identitySession: {
      id: identity.sessionId,
      token: identity.sessionToken,
      expiresAt: identity.expiresAt,
    },
  };
}

type TestConfig = { adminHost: string };

function dependencies(
  overrides: Partial<AdminAuthorizationDependencies<TestConfig>> = {},
): AdminAuthorizationDependencies<TestConfig> {
  return {
    readAuthProvider: () => "self-hosted",
    readRequestHeaders: () => new Headers({ host: "admin.example.com" }),
    readIdentityConfig: () => ({ adminHost: "admin.example.com" }),
    resolveIdentitySurface: (host, config) =>
      host === config.adminHost ? "admin" : null,
    requireIdentitySession: async () => identitySession(),
    loadAdminSession: async () => adminSession(),
    ...overrides,
  };
}

async function rejectedAuthorization(
  overrides: Partial<AdminAuthorizationDependencies<TestConfig>>,
): Promise<AdminAuthorizationError> {
  try {
    await authorizeAdminRequest("admin.access", undefined, dependencies(overrides));
  } catch (error) {
    assert.ok(error instanceof AdminAuthorizationError);
    return error;
  }
  assert.fail("authorization unexpectedly succeeded");
}

test("anonymous admin access is 401", () => {
  assert.deepEqual(authorizeAdminAccess(null, [], "admin.access"), {
    allowed: false,
    status: 401,
  });
});

test("missing permission is 403", () => {
  assert.deepEqual(authorizeAdminAccess(user(), [], "admin.access"), {
    allowed: false,
    status: 403,
  });
  assert.deepEqual(authorizeAdminAccess(user(), ["admin.access"], "models.publish"), {
    allowed: false,
    status: 403,
  });
});

test("database permission keys authorize only the requested operation", () => {
  assert.deepEqual(authorizeAdminAccess(user(), ["admin.access"], "admin.access"), {
    allowed: true,
  });
  assert.deepEqual(authorizeAdminAccess(user(), ["models.read", "models.publish"], "models.publish"), {
    allowed: true,
  });
});

test("admin authorization checks the configured admin Host before session lookup", async () => {
  let sessionRead = false;
  const error = await rejectedAuthorization({
    readRequestHeaders: () => new Headers({ host: "user.example.com" }),
    requireIdentitySession: async () => {
      sessionRead = true;
      return identitySession();
    },
  });

  assert.equal(error.status, 403);
  assert.equal(error.message, "无权访问后台");
  assert.equal(sessionRead, false);
});

test("known admin and identity authorization errors preserve 401/403 semantics", async () => {
  const original = new AdminAuthorizationError("请求来源不可信", 403);
  const preserved = await rejectedAuthorization({
    readIdentityConfig: () => {
      throw original;
    },
  });
  assert.equal(preserved, original);

  for (const [status, message] of [[401, "请先登录"], [403, "无权访问后台"]] as const) {
    const mapped = await rejectedAuthorization({
      requireIdentitySession: async () => {
        throw new IdentityAuthorizationError("provider detail", status);
      },
    });
    assert.equal(mapped.status, status);
    assert.equal(mapped.message, message);
  }
});

test("configuration, identity reader, and RBAC query failures become sanitized 503", async () => {
  const failures: Array<Partial<AdminAuthorizationDependencies<TestConfig>>> = [
    {
      readIdentityConfig: () => {
        throw new Error("BETTER_AUTH_USER_SECRET leaked detail");
      },
    },
    {
      requireIdentitySession: async () => {
        throw new Error("better-auth or identity database leaked detail");
      },
    },
    {
      loadAdminSession: async () => {
        throw new Error("postgres admin_permission_keys leaked detail");
      },
    },
  ];

  for (const failure of failures) {
    const error = await rejectedAuthorization(failure);
    assert.equal(error.status, 503);
    assert.equal(error.message, "后台服务暂时不可用");
  }
});

test("adminErrorResponse maps model provider configuration failures without exposing details", async () => {
  for (const [error, status, message] of [
    [new Error("模型供应商地址不在服务器允许列表中"), 400, "模型供应商地址不在服务器允许列表中"],
    [new Error("网关地址不允许解析到本机、内网或保留地址"), 400, "网关地址不允许解析到本机、内网或保留地址"],
    [new Error("model_provider_url_unsafe"), 400, "模型供应商地址不安全或解析到内网"],
    [new Error("model_provider_key_required"), 409, "模型供应商密钥未配置"],
  ] as const) {
    const response = adminErrorResponse(error);
    assert.equal(response.status, status);
    assert.deepEqual(await response.json(), { error: message });
  }

  for (const error of [new Error("model_provider_runtime_immutable"), new Error("model_provider_code_immutable")]) {
    const response = adminErrorResponse(error);
    assert.equal(response.status, 500);
    assert.deepEqual(await response.json(), { error: "后台服务暂时不可用" });
  }
});

test("adminErrorResponse preserves the sanitized authorization 503", async () => {
  const response = adminErrorResponse(
    new AdminAuthorizationError("后台服务暂时不可用", 503),
  );

  assert.equal(response.status, 503);
  assert.deepEqual(await response.json(), { error: "后台服务暂时不可用" });
});