/**
 * Peer-assisted system drive seeding (eligibility + disk.os mirror RPC).
 */
import test from 'brittle'
import b4a from 'b4a'
import {
  BARE_OS_KERNEL_CAPABILITY_WORDS_JSON_KEY,
  BARE_OS_KERNEL_FEATURES_STOCK_WORD_PRIMARY
} from 'bare-os-protocol'
import { createBareOsDiskOsBridge } from './lib/bare-os-disk-os-bridge.js'
import { BARE_OS_CTX_API_VERSION } from './lib/bare-os-ctx-api.js'
import { buildStockKernelCapabilityWords } from './lib/bare-os-capability-registry.js'
import {
  buildPeerSeedSnapshots,
  computePeerSystemSeedEligibility,
  maybeSynthesizePeerSeedCapabilityInfo,
  peerSystemSeedEnvEnabled,
  peerSystemSeedExplicitAffirmative
} from './lib/bare-os-peer-system-seed.js'

function mockDisk(overrides = {}) {
  const words = buildStockKernelCapabilityWords(
    BARE_OS_KERNEL_FEATURES_STOCK_WORD_PRIMARY
  )
  const mbr = new Uint8Array(512)
  mbr.fill(7)
  const keyHex = 'ab'.repeat(32)
  return {
    seedCapabilityInfo: {
      doc: 'd',
      [BARE_OS_KERNEL_CAPABILITY_WORDS_JSON_KEY]: words,
      protocolPackageVersion: '0.9.0',
      protocol: 'bare-os-v1',
      role: 'seeder',
      imageTipId: 'tip-alpha'
    },
    bootMbr512: mbr,
    mbrKeysHex: [keyHex],
    drive: { id: b4a.from(keyHex, 'hex') },
    seedReplicationStatus: { schema: 1, ok: true },
    seedManifestHints: null,
    ...overrides
  }
}

test('peerSystemSeedEnvEnabled defaults on; explicit opt-out', (t) => {
  t.ok(peerSystemSeedEnvEnabled({ BARE_OS_PEER_SYSTEM_SEED: '1' }))
  t.ok(peerSystemSeedEnvEnabled({ BARE_OS_PEER_SYSTEM_SEED: 'true' }))
  t.ok(peerSystemSeedEnvEnabled({}))
  t.absent(peerSystemSeedEnvEnabled({ BARE_OS_PEER_SYSTEM_SEED: '0' }))
  t.absent(peerSystemSeedEnvEnabled({ BARE_OS_PEER_SYSTEM_SEED: 'false' }))
  t.absent(peerSystemSeedEnvEnabled({ BARE_OS_PEER_SYSTEM_SEED: 'off' }))
})

test('peerSystemSeedEnvEnabled strict profile defaults off unless explicit enable', (t) => {
  t.absent(peerSystemSeedEnvEnabled({ BARE_OS_ZERO_TRUST_PROFILE: 'strict' }))
  t.ok(
    peerSystemSeedEnvEnabled({
      BARE_OS_ZERO_TRUST_PROFILE: 'strict',
      BARE_OS_PEER_SYSTEM_SEED: '1'
    })
  )
})

test('peerSystemSeedExplicitAffirmative only for 1/true/yes', (t) => {
  t.ok(peerSystemSeedExplicitAffirmative({ BARE_OS_PEER_SYSTEM_SEED: '1' }))
  t.absent(peerSystemSeedExplicitAffirmative({}))
  t.absent(peerSystemSeedExplicitAffirmative({ BARE_OS_PEER_SYSTEM_SEED: '0' }))
})

test('computePeerSystemSeedEligibility ok with default env and disk valid', (t) => {
  const disk = mockDisk()
  const r = computePeerSystemSeedEligibility({
    disk,
    systemRevision: { currentId: 'rev1', pendingId: '', slot: 'a' },
    env: {}
  })
  t.ok(r.ok)
})

test('strict bare_os.capabilities pre-MBR negotiation rejects mirror eligibility', (t) => {
  const disk = mockDisk({
    bootMbr512: null,
    mbrKeysHex: []
  })
  const r = computePeerSystemSeedEligibility({
    disk,
    systemRevision: { currentId: 'rev1', pendingId: '', slot: 'a' },
    env: { BARE_OS_PEER_SYSTEM_SEED: '1' }
  })
  t.is(r.ok, false)
  if (!r.ok) t.is(r.reason, 'no_boot_mbr')
})

test('maybeSynthesizePeerSeedCapabilityInfo enables eligibility after handshake gap', (t) => {
  const disk = mockDisk({
    seedCapabilityInfo: null,
    seedReplicationStatus: null
  })
  maybeSynthesizePeerSeedCapabilityInfo(disk, {
    BARE_OS_SEED_IMAGE_TIP_ID: 'tip-alpha'
  })
  const r = computePeerSystemSeedEligibility({
    disk,
    systemRevision: {},
    env: { BARE_OS_PEER_SEED_IMAGE_TIP_ID: 'tip-alpha' }
  })
  t.ok(r.ok)
})

test('maybeSynthesizePeerSeedCapabilityInfo replaces capability error', (t) => {
  const disk = mockDisk({
    seedCapabilityInfo: { error: 'rpc failed' },
    seedReplicationStatus: null
  })
  maybeSynthesizePeerSeedCapabilityInfo(disk, {})
  t.absent(disk.seedCapabilityInfo && 'error' in disk.seedCapabilityInfo)
  const r = computePeerSystemSeedEligibility({ disk, systemRevision: {}, env: {} })
  t.ok(r.ok)
})

test('maybeSynthesizePeerSeedCapabilityInfo opt-out preserves failure', (t) => {
  const disk = mockDisk({
    seedCapabilityInfo: null,
    seedReplicationStatus: null
  })
  maybeSynthesizePeerSeedCapabilityInfo(disk, {
    BARE_OS_PEER_SEED_SYNTHETIC_CAPABILITIES: '0'
  })
  const r = computePeerSystemSeedEligibility({ disk, systemRevision: {}, env: {} })
  t.is(r.ok, false)
  if (!r.ok) t.is(r.reason, 'no_seed_capability_info')
})

test('maybeSynthesizePeerSeedCapabilityInfo disabled in strict profile', (t) => {
  const disk = mockDisk({
    seedCapabilityInfo: null,
    seedReplicationStatus: null
  })
  maybeSynthesizePeerSeedCapabilityInfo(disk, {
    BARE_OS_ZERO_TRUST_PROFILE: 'strict'
  })
  const r = computePeerSystemSeedEligibility({ disk, systemRevision: {}, env: {} })
  t.is(r.ok, false)
  if (!r.ok) t.is(r.reason, 'no_seed_capability_info')
})

test('computePeerSystemSeedEligibility env_disabled when opted out', (t) => {
  const disk = mockDisk()
  const r = computePeerSystemSeedEligibility({
    disk,
    systemRevision: {},
    env: { BARE_OS_PEER_SYSTEM_SEED: '0' }
  })
  t.is(r.ok, false)
  if (!r.ok) t.is(r.reason, 'env_disabled')
})

test('computePeerSystemSeedEligibility image tip mismatch', (t) => {
  const disk = mockDisk()
  const r = computePeerSystemSeedEligibility({
    disk,
    systemRevision: {},
    env: {
      BARE_OS_PEER_SEED_IMAGE_TIP_ID: 'other-tip'
    }
  })
  t.is(r.ok, false)
  if (!r.ok) t.is(r.reason, 'image_tip_mismatch')
})

test('computePeerSystemSeedEligibility revision gate', (t) => {
  const disk = mockDisk()
  const r = computePeerSystemSeedEligibility({
    disk,
    systemRevision: { currentId: 'wrong', pendingId: '', slot: 'a' },
    env: {
      BARE_OS_PEER_SEED_REQUIRE_REVISION_ID: 'need-this'
    }
  })
  t.is(r.ok, false)
  if (!r.ok) t.is(r.reason, 'system_revision_mismatch')
})

test('buildPeerSeedSnapshots maps disk seed fields', (t) => {
  const disk = mockDisk()
  const m = buildPeerSeedSnapshots(disk)
  t.ok(m.replication_status && /** @type {{ ok?: boolean }} */ (m.replication_status).ok)
  t.is(m.manifest_hints, null)
})

test('disk.os bare_os.capabilities when peerSystemSeedMirror', async (t) => {
  const disk = mockDisk()
  const snaps = buildPeerSeedSnapshots(disk)
  const bridge = createBareOsDiskOsBridge({
    drive: null,
    bareOsIpc: { list: () => [] },
    ctxApiVersion: BARE_OS_CTX_API_VERSION,
    systemRevision: { currentId: 'x', pendingId: '', slot: 'a' },
    bootStartedMs: Date.now(),
    booterPackageVersion: '0.1.0-test',
    seedCapabilityInfo: /** @type {Record<string, unknown>} */ (
      disk.seedCapabilityInfo
    ),
    peerSystemSeedMirror: true,
    peerSeedSnapshots: snaps
  })
  const raw = await bridge.execRpc('bare_os', 'capabilities', [])
  const j = JSON.parse(raw)
  t.is(j.role, 'peer-system-seeder')
  t.ok(j[BARE_OS_KERNEL_CAPABILITY_WORDS_JSON_KEY])
  const rs = await bridge.execRpc('bare_os', 'replication_status', [])
  t.ok(JSON.parse(rs).ok)
})

test('disk.os mirrored RPC returns miss payload when snapshot null', async (t) => {
  const disk = mockDisk()
  const bridge = createBareOsDiskOsBridge({
    drive: null,
    bareOsIpc: { list: () => [] },
    ctxApiVersion: BARE_OS_CTX_API_VERSION,
    systemRevision: null,
    bootStartedMs: Date.now(),
    seedCapabilityInfo: /** @type {Record<string, unknown>} */ (
      disk.seedCapabilityInfo
    ),
    peerSystemSeedMirror: true,
    peerSeedSnapshots: { manifest_hints: null, replication_status: { x: 1 } }
  })
  const raw = await bridge.execRpc('bare_os', 'manifest_hints', [])
  const j = JSON.parse(raw)
  t.is(j.role, 'peer-system-seeder')
  t.is(j.reason, 'not_captured_at_boot')
})

test('peer helper can remain block-0 eligible after original seeder exits', (t) => {
  const disk = mockDisk({
    // Seeder-side hints are gone, but helper still has cached boot MBR block 0.
    seedCapabilityInfo: null,
    seedReplicationStatus: null,
    seedManifestHints: null
  })
  maybeSynthesizePeerSeedCapabilityInfo(disk, {
    BARE_OS_SEED_IMAGE_TIP_ID: 'tip-alpha'
  })
  const r = computePeerSystemSeedEligibility({
    disk,
    systemRevision: { currentId: 'rev1', pendingId: '', slot: 'a' },
    env: {
      BARE_OS_PEER_SYSTEM_SEED: '1',
      BARE_OS_PEER_SEED_IMAGE_TIP_ID: 'tip-alpha'
    }
  })
  t.ok(r.ok, 'helper remains eligible to serve cached MBR block 0')
  const snaps = buildPeerSeedSnapshots(disk)
  t.is(snaps.replication_status, null, 'RPC snapshots may be absent post-exit')
})