/**
 * The host row: the deployment's policy and its lifetime.
 *
 * Short, but it is the half that is easiest to leave untested — it has no
 * interesting logic and one interesting obligation, which is that a grant must
 * not outlive the session that asked for it.
 */

import assert from 'node:assert/strict'
import { test } from 'node:test'

import { apply, Config } from '../index.js'
import { configValue } from '../lib/policy.js'

/**
 * The symbol cosmokit marks a volatile config reference with, and the writer it
 * carries. A settings write reaches a running plugin through exactly this
 * function — `updateVolatile(target, source)` is `target[write](source.get())` —
 * so a test can commit an edit the same way the framework does.
 */
const VOLATILE_WRITE = Symbol.for('cosmokit.volatile.write')

/** Whether a field arrived as a live reference rather than a plain value. */
const isReference = (value) => typeof value === 'object' && value !== null && VOLATILE_WRITE in value

/** The smallest context this row touches. */
function harness() {
  const captured = { provided: undefined, onDisposed: undefined }
  const ctx = {
    provide: (name, value) => {
      captured.provided = { name, value }
    },
    on: (event, listener) => {
      if (event === 'session/disposed') captured.onDisposed = listener
    },
  }
  apply(ctx, Config({ mode: 'ask' }))
  return captured
}

test('the schema fills every default, so a bare row is a working row', () => {
  const config = Config({})
  assert.equal(configValue(config.mode), 'ask')
  assert.deepEqual(configValue(config.extraRoots), [])
  assert.equal(config.sectionOrder, 100)
  assert.equal(config.contextOrder, 105)
})

test('the editable fields are volatile, which is the only reason they have a settings card', () => {
  const config = Config({})
  // The framework's form projection keeps only fields under a volatile ancestor
  // and drops an entry with no such field from `settings.describe` entirely, so
  // dropping either of these markers silently removes the card from the UI.
  assert.equal(isReference(config.mode), true)
  assert.equal(isReference(config.extraRoots), true)

  // Placement is settled once at load: not settings anyone edits live, and not
  // on the card.
  assert.equal(isReference(config.sectionOrder), false)
  assert.equal(isReference(config.contextOrder), false)
})

test('a settings edit is answered on the next call, without the plugin being re-applied', () => {
  const provided = []
  let applies = 0
  const config = Config({ mode: 'ask', extraRoots: ['/w/src/shared'] })
  apply(
    {
      provide: (name, value) => {
        applies += 1
        provided.push({ name, value })
      },
      on: () => {},
    },
    config,
  )
  const policy = provided[0].value
  assert.equal(policy.mode, 'ask')
  assert.deepEqual(policy.standing, ['/w/src/shared'])

  // What the framework does on a settings write: it commits into the running
  // references and deliberately does NOT re-apply the plugin. Everything the
  // policy reports has to follow from the reference alone.
  config.mode[VOLATILE_WRITE]('deny')
  config.extraRoots[VOLATILE_WRITE](['/w/src/shared', '/w/src/types'])

  assert.equal(applies, 1)
  assert.equal(policy.mode, 'deny')
  assert.deepEqual(policy.standing, ['/w/src/shared', '/w/src/types'])
  assert.deepEqual(
    policy.scopeFor({ session: { id: 's1', header: { cwd: '/w/src/room' } } }).extras,
    ['/w/src/shared', '/w/src/types'],
  )
})

test('a bad mode fails loudly at load rather than at the first file call', () => {
  assert.throws(() => Config({ mode: 'maybe' }))
})

test('the policy is published under the name the guard injects', () => {
  const captured = harness()
  assert.equal(captured.provided.name, 'facetPolicy')
  assert.equal(captured.provided.value.mode, 'ask')
})

test('the service reads the configuration it was given', () => {
  const provided = []
  apply(
    { provide: (name, value) => provided.push({ name, value }), on: () => {} },
    Config({ mode: 'deny', extraRoots: ['../../shared'], sectionOrder: 7, contextOrder: 8 }),
  )
  const policy = provided[0].value
  assert.equal(policy.mode, 'deny')
  assert.deepEqual(policy.standing, ['../../shared'])
  assert.equal(policy.sectionOrder, 7)
  assert.equal(policy.contextOrder, 8)
})

test('a disposed session does not leave its grant behind', () => {
  const captured = harness()
  const policy = captured.provided.value
  policy.grant('session-1', ['../../shared'], '/w/src/room')
  assert.deepEqual(policy.grantsFor('session-1'), ['/w/shared'])

  assert.equal(typeof captured.onDisposed, 'function')
  captured.onDisposed({ id: 'session-1' })
  assert.deepEqual(policy.grantsFor('session-1'), [])
  assert.deepEqual(policy.sessions, [])
})