// A check is worth what it catches, so this breaks it thirteen ways.
//
// The case that matters most is the last one: `checkPlugin.js` finds hooks with a
// deliberately narrow regex, and a regex that silently matches NOTHING passes
// every check in this file and every check in CI while asserting nothing at all.
// So the real plugin source is read here too, and the parse is asserted against
// hooks that are known to be in it.
//
//   node --test scripts/checkPlugin.test.js
//
// Named individually rather than `node --test scripts/`: directory mode is not
// portable across the Node versions this project runs on.

const test = require('node:test')
const assert = require('node:assert')
const fs = require('node:fs')
const path = require('node:path')

const { check, readExpectedHooks, readMethods, readChatCommands, HOOK_NAME } = require('./checkPlugin')

/** A minimal plugin that passes, as the baseline every case below deviates from. */
function source({ expected = ['OnPlayerDeath'], methods, version = 2 } = {}) {
  const body =
    methods ??
    `        private void OnPlayerDeath(BasePlayer player, HitInfo info)
        {
        }`

  return `namespace Oxide.Plugins
{
    internal class RunicGateway : RustPlugin
    {
        private const int ProtocolVersion = ${version};

        private static readonly string[] ExpectedHooks =
        {
            ${expected.map((e) => `"${e}"`).join(', ')}
        };

${body}
    }
}`
}

const toml = (version = 2) => `protocol = ${version}\n`

test('a plugin that follows the rules passes', () => {
  assert.deepEqual(check(source(), toml()), [])
})

test('a hook missing from ExpectedHooks is caught, because rg.hooks could not report it', () => {
  const problems = check(source({ expected: [] }), toml())
  assert.equal(problems.length, 1)
  assert.match(problems[0], /OnPlayerDeath is implemented but missing from ExpectedHooks/)
})

test('a hook that can answer is caught — the rule the read path depends on', () => {
  const methods = `        private object OnPlayerDeath(BasePlayer player, HitInfo info)
        {
            return null;
        }`

  const problems = check(source({ methods }), toml())
  assert.equal(problems.length, 1)
  assert.match(problems[0], /returns object, not void/)
})

test('returning null is not good enough — the signature is the rule', () => {
  // `return null` today is one edit away from `return true` tomorrow, and the
  // edit that breaks it looks harmless in a diff. A void method cannot be
  // changed into a veto without changing its signature, which is visible.
  const methods = `        private bool CanUserLogin(string name, string id, string ip)
        {
            return true;
        }`

  const problems = check(source({ expected: ['CanUserLogin'], methods }), toml())
  assert.match(problems[0], /CanUserLogin returns bool, not void/)
})

test('a name listed but never implemented is caught, because it reports silent for ever', () => {
  const problems = check(source({ expected: ['OnPlayerDeath', 'OnNewSave'] }), toml())
  assert.equal(problems.length, 1)
  assert.match(problems[0], /ExpectedHooks lists OnNewSave, but no method/)
})

test('a protocol version that disagrees with overlay.toml is caught', () => {
  const problems = check(source({ version: 3 }), toml(2))
  assert.equal(problems.length, 1)
  assert.match(problems[0], /speaks protocol 3 and overlay\.toml declares 2/)
})

test('a method that is not shaped like a hook is left alone', () => {
  // `Cadence`, `Frame`, `Flatten` and friends are ours, return real types, and
  // must not be dragged into the void rule.
  const methods = `        private Dictionary<string, object> Frame(string kind, string type)
        {
            return null;
        }

        private static string Column(int index)
        {
            return null;
        }`

  assert.deepEqual(check(source({ expected: [], methods }), toml()), [])
  assert.ok(!HOOK_NAME.test('Cadence'))
  assert.ok(!HOOK_NAME.test('Frame'))
  assert.ok(HOOK_NAME.test('OnPlayerDeath'))
  assert.ok(HOOK_NAME.test('CanUserLogin'))
})

test('the parser actually reads the real plugin, rather than quietly matching nothing', () => {
  const real = fs.readFileSync(
    path.resolve(__dirname, '..', 'overlay', 'oxide', 'plugins', 'RunicGateway.cs'),
    'utf8'
  )

  const methods = readMethods(real)
  const names = new Set(methods.map((m) => m.name))

  // A narrow regex that matches nothing passes every other test in this file.
  assert.ok(methods.length > 20, `only found ${methods.length} methods in the real plugin`)
  for (const hook of ['OnPlayerDeath', 'OnPlayerConnected', 'CanUserLogin', 'OnNewSave']) {
    assert.ok(names.has(hook), `${hook} was not found by the method parser`)
  }

  const expected = readExpectedHooks(real)
  assert.ok(expected.length >= 15, `only found ${expected.length} entries in ExpectedHooks`)
})

// ── Chat commands (protocol 3) ─────────────────────────────────────────────
//
// A chat command binds by reflection on an exact signature, and a wrong one is
// never invoked and never logged: the player types `/link` and nothing happens.
// That is the same failure mode the hook checks exist for, one surface along.

/** A plugin whose only body is one chat command. */
function withChat(attribute, signature, returns = 'void') {
  return source({
    expected: [],
    methods: `        [ChatCommand("${attribute}")]
        private ${returns} CmdThing(${signature})
        {
        }`,
  })
}

const GOOD_SIGNATURE = 'BasePlayer player, string command, string[] args'

test('a correctly shaped chat command passes', () => {
  assert.deepEqual(check(withChat('link', GOOD_SIGNATURE), toml()), [])
})

test('a chat command taking the wrong player type is caught', () => {
  // The plausible mistake: Covalence's `IPlayer` is what a Universal plugin
  // takes, and this plugin is not one. It compiles and binds nothing.
  const problems = check(withChat('link', 'IPlayer player, string command, string[] args'), toml())

  assert.equal(problems.length, 1)
  assert.match(problems[0], /not \(BasePlayer, string, string\[\]\)/)
})

test('a chat command missing the trailing args is caught', () => {
  const problems = check(withChat('link', 'BasePlayer player, string command'), toml())

  assert.equal(problems.length, 1)
  assert.match(problems[0], /nothing happens at all/)
})

test('a chat command that returns something is caught', () => {
  const problems = check(withChat('link', GOOD_SIGNATURE, 'object'), toml())

  assert.equal(problems.length, 1)
  assert.match(problems[0], /returns object, not void/)
})

test('two chat commands answering to one name is caught', () => {
  const both = source({
    expected: [],
    methods: `        [ChatCommand("link")]
        private void CmdOne(${GOOD_SIGNATURE})
        {
        }

        [ChatCommand("link")]
        private void CmdTwo(${GOOD_SIGNATURE})
        {
        }`,
  })

  const problems = check(both, toml())

  assert.equal(problems.length, 1)
  assert.match(problems[0], /declared twice/)
})

test('the chat-command parser reads the real plugin, rather than quietly matching nothing', () => {
  // The same trap the method parser has, and the reason this file's last test
  // exists: a regex that matches NOTHING passes every case above.
  const real = fs.readFileSync(
    path.resolve(__dirname, '..', 'overlay', 'oxide', 'plugins', 'RunicGateway.cs'),
    'utf8'
  )

  const commands = readChatCommands(real)
  const names = new Set(commands.map((c) => c.command))

  assert.ok(commands.length >= 2, `only found ${commands.length} chat commands in the real plugin`)
  assert.ok(names.has('link'), '/link was not found by the chat-command parser')
  assert.ok(names.has('unlink'), '/unlink was not found by the chat-command parser')
})