#!/usr/bin/env node
/**
 * Fake claude CLI for hermetic tests.
 *
 * Mimics the stream-json output format of claude CLI 2.1.159:
 * top-level events are either bare objects (system, assistant, result) or
 * wrapped in {type:"stream_event", event:{...}}.
 *
 * Writes to stdout and exits 0.
 */

const lines = [
  // system init (ignored by driver)
  { type: 'system', subtype: 'init', session_id: 'fake-session-001', tools: [], cwd: '/tmp' },

  // content_block_start: text block
  { type: 'stream_event', event: { type: 'content_block_start', index: 0, content_block: { type: 'text', text: '' } } },

  // text deltas — together they spell "Hello"
  { type: 'stream_event', event: { type: 'content_block_delta', index: 0, delta: { type: 'text_delta', text: 'Hel' } } },
  { type: 'stream_event', event: { type: 'content_block_delta', index: 0, delta: { type: 'text_delta', text: 'lo' } } },

  // assistant snapshot (should be ignored by driver to avoid duplication)
  { type: 'assistant', message: { role: 'assistant', content: [{ type: 'text', text: 'Hello' }] } },

  // content_block_stop for text
  { type: 'stream_event', event: { type: 'content_block_stop', index: 0 } },

  // content_block_start: tool_use
  { type: 'stream_event', event: { type: 'content_block_start', index: 1, content_block: { type: 'tool_use', id: 'toolu_fake01', name: 'propose_change', input: {} } } },

  // tool input delta
  { type: 'stream_event', event: { type: 'content_block_delta', index: 1, delta: { type: 'input_json_delta', partial_json: '{"file":"/tmp/x.js","content":"console.log(1)"}' } } },

  // assistant snapshot for tool_use (ignored)
  { type: 'assistant', message: { role: 'assistant', content: [{ type: 'tool_use', id: 'toolu_fake01', name: 'propose_change', input: { file: '/tmp/x.js', content: 'console.log(1)' } }] } },

  // content_block_stop for tool
  { type: 'stream_event', event: { type: 'content_block_stop', index: 1 } },

  // tool_result event
  { type: 'tool_result', tool_use_id: 'toolu_fake01', content: [{ type: 'text', text: 'change staged' }] },

  // final result
  {
    type: 'result',
    subtype: 'success',
    is_error: false,
    result: 'Hello',
    stop_reason: 'end_turn',
    session_id: 'fake-session-001',
    total_cost_usd: 0.001234,
    usage: {
      input_tokens: 100,
      output_tokens: 10,
      cache_read_input_tokens: 0,
      cache_creation_input_tokens: 0,
    },
  },
];

for (const line of lines) {
  process.stdout.write(JSON.stringify(line) + '\n');
}

process.exit(0);