import { describe, expect, it, vi } from 'vitest'
import { deriveContentKey, encodeEnvelope, openReplayCiphertext, randomBytes, sealReplayFrame } from 'relay-e2e'

// Mock the xterm modules so the DEFAULT (non-injected) terminal loaders run without a real canvas.
const writes: string[] = []
vi.mock('@xterm/xterm', () => ({
  Terminal: class {
    cols = 80
    rows = 24
    constructor(_opts?: unknown) {}
    loadAddon(_a: unknown): void {}
    open(_el: unknown): void {}
    write(data: string): void {
      writes.push(data)
    }
    onData(_cb: (d: string) => void): void {}
    dispose(): void {}
  },
}))
vi.mock('@xterm/addon-fit', () => ({
  FitAddon: class {
    fit(): void {}
  },
}))

import { mountTerminalView } from '../src/terminal-view'
import { mountPreviewClient, type ReplaySource } from '../src/preview-client'
import type { TerminalTransport } from '../src/ws-transport'

const tick = () => new Promise((r) => setTimeout(r, 0))

describe('default (real-xterm) loaders behind the DI seam', () => {
  it('mountTerminalView loads the default xterm + FitAddon and sends attach', async () => {
    const root = document.createElement('div')
    Object.defineProperty(root, 'clientWidth', { value: 100 })
    Object.defineProperty(root, 'clientHeight', { value: 100 })
    const sent: Uint8Array[] = []
    const transport: TerminalTransport = {
      open: async () => {},
      send: (b) => sent.push(b),
      onMessage: () => {},
      onClose: () => {},
      close: () => {},
    }
    const view = mountTerminalView(root, transport) // NO createTerminal → default loader path
    await tick()
    await tick()
    const first = JSON.parse(new TextDecoder().decode(sent[0]!))
    expect(first.type).toBe('attach')
    view.dispose()
  })

  it('mountPreviewClient renders via the default read-only xterm loader', async () => {
    const secret = randomBytes(32)
    const epoch = 'gen-1' // FIX 3b / F6: seal + declare under the same generation.
    const k = deriveContentKey({ hostContentSecret: secret, sessionId: 's', alg: 'aes-256-gcm', epoch })
    const replay: ReplaySource = {
      sessionId: 's',
      alg: 'aes-256-gcm',
      epoch,
      frames: [encodeEnvelope(sealReplayFrame(k, 0n, new TextEncoder().encode('DEFAULT-XTERM')))],
    }
    const card = document.createElement('div')
    const client = mountPreviewClient(card, replay, secret, { cols: 80, rows: 24 }, {
      deriveContentKey,
      openReplayCiphertext,
    })
    await client.render()
    await tick()
    await tick()
    expect(writes).toContain('DEFAULT-XTERM')
    client.dispose()
  })
})
