import { describe, expect, it } from 'bun:test'
import { readFileSync } from 'node:fs'
import { join } from 'node:path'
import { openDocument } from '../vendor/config-editor/index.ts'
import {
  collectInbounds,
  collectOutboundNames,
  fallbackTarget,
  outboundToProxyField,
  resolveDestination,
} from './inbounds.ts'

const fixture = openDocument(
  readFileSync(join(import.meta.dir, '__fixtures__', 'config-with-comments.yaml'), 'utf8'),
).data

describe('合并两套写法的入站', () => {
  it('只有旧写法时也能列出来，不会是空表', () => {
    const list = collectInbounds(fixture)
    expect(list).toHaveLength(1)
    expect(list[0]!.port).toBe('7777')
    expect(list[0]!.type).toBe('mixed')
    expect(list[0]!.isDefault).toBe(true)
    expect(list[0]!.legacyKey).toBe('mixed-port')
  })

  it('端口写 0 表示没启用，不该出现在表里', () => {
    const list = collectInbounds({ 'mixed-port': 7777, 'socks-port': 0, port: 0 })
    expect(list.map((i) => i.legacyKey)).toEqual(['mixed-port'])
  })

  it('新旧两套同时存在时都要列出来', () => {
    const list = collectInbounds({
      'mixed-port': 7777,
      listeners: [{ name: '容器A', type: 'mixed', port: 7778, proxy: 'AUTO' }],
    })
    expect(list.map((i) => i.name)).toEqual(['mixed-port', '容器A'])
    expect(list[0]!.isDefault).toBe(true)
    expect(list[1]!.isDefault).toBe(false)
    expect(list[1]!.listenerIndex).toBe(0)
  })

  it('默认入站的出站永远是「跟着规则走」，因为旧写法没处写', () => {
    expect(collectInbounds({ 'mixed-port': 7777 })[0]!.outbound).toEqual({ kind: 'rules' })
  })
})

describe('老式端口实际绑在哪', () => {
  // 内核源码 listener/listener.go:709-718。界面上一律显示 0.0.0.0 会骗人。
  it('allow-lan 没开时只绑本机', () => {
    expect(collectInbounds({ 'mixed-port': 7777 })[0]!.listen).toBe('127.0.0.1')
    expect(collectInbounds({ 'mixed-port': 7777, 'allow-lan': false })[0]!.listen).toBe('127.0.0.1')
  })

  it('allow-lan 开了但没指定地址时绑所有网卡', () => {
    expect(collectInbounds({ 'mixed-port': 7777, 'allow-lan': true })[0]!.listen).toBe('0.0.0.0')
    expect(
      collectInbounds({ 'mixed-port': 7777, 'allow-lan': true, 'bind-address': '*' })[0]!.listen,
    ).toBe('0.0.0.0')
  })

  it('指定了地址就用那个地址', () => {
    expect(
      collectInbounds({ 'mixed-port': 7777, 'allow-lan': true, 'bind-address': '192.168.1.5' })[0]!
        .listen,
    ).toBe('192.168.1.5')
  })
})

describe('出站去向的四种形态', () => {
  const of = (proxy?: string) => {
    // 用扩展而不是直接写 proxy: undefined —— 配置里「没有这个键」和「这个键是空」
    // 是两回事，测试要还原真实的文件形状。
    const listener = { name: 'x', type: 'mixed', port: 1, ...(proxy === undefined ? {} : { proxy }) }
    return collectInbounds({ listeners: [listener] })[0]!.outbound
  }

  it('没写 proxy 就是跟着规则走', () => {
    expect(of()).toEqual({ kind: 'rules' })
    expect(of('')).toEqual({ kind: 'rules' })
  })

  it('DIRECT 和 GLOBAL 是内核自带的，单独成一类', () => {
    expect(of('DIRECT')).toEqual({ kind: 'direct' })
    expect(of('GLOBAL')).toEqual({ kind: 'global' })
  })

  it('其余都是指名道姓的出站', () => {
    expect(of('AUTO')).toEqual({ kind: 'named', name: 'AUTO' })
  })

  it('写回时能还原成原来的字段值', () => {
    expect(outboundToProxyField({ kind: 'rules' })).toBeUndefined()
    expect(outboundToProxyField({ kind: 'direct' })).toBe('DIRECT')
    expect(outboundToProxyField({ kind: 'global' })).toBe('GLOBAL')
    expect(outboundToProxyField({ kind: 'named', name: 'AUTO' })).toBe('AUTO')
  })
})

describe('能被入站引用的出站名字', () => {
  it('列出内置出站、策略组和自有线路', () => {
    const names = collectOutboundNames(fixture)
    expect(names.groups).toEqual(['PROXY', 'AUTO'])
    expect(names.builtins).toContain('DIRECT')
    expect(names.builtins).toContain('GLOBAL')
  })

  it('订阅带来的线路不在其中——它们不在内核的名字表上', () => {
    const names = collectOutboundNames(fixture)
    // 样本里唯一的订阅是 subs，它带来的线路无法被按名字引用
    expect(names.ownProxies).toEqual([])
    expect([...names.groups, ...names.ownProxies, ...names.builtins]).not.toContain('subs')
  })
})

describe('流量最终去哪', () => {
  const cfg = {
    'mixed-port': 7777,
    rules: ['IP-CIDR,127.0.0.0/8,DIRECT,no-resolve', 'MATCH,PROXY'],
    listeners: [
      { name: '固定', type: 'mixed', port: 7778, proxy: 'AUTO' },
      { name: '直连', type: 'mixed', port: 7779, proxy: 'DIRECT' },
    ],
  }

  it('走规则的入站要继续查到规则表末尾的 MATCH', () => {
    // 用户想知道的是流量去哪，不是 proxy 字段写没写
    const legacy = collectInbounds(cfg)[0]!
    expect(legacy.outbound).toEqual({ kind: 'rules' })
    expect(resolveDestination(cfg, legacy)).toBe('PROXY')
  })

  it('指定了出站的入站就是那个出站', () => {
    const list = collectInbounds(cfg)
    expect(resolveDestination(cfg, list[1]!)).toBe('AUTO')
    expect(resolveDestination(cfg, list[2]!)).toBe('DIRECT')
  })

  it('MATCH 之后的规则到不了，取第一条', () => {
    expect(fallbackTarget({ rules: ['MATCH,A', 'MATCH,B'] })).toBe('A')
  })

  it('没有 MATCH 时没有兜底', () => {
    expect(fallbackTarget({ rules: ['MATCH-NOT-REALLY,X'] })).toBeNull()
    expect(fallbackTarget({})).toBeNull()
  })
})