import { chmod, mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { Command } from 'commander';
import { afterEach, describe, expect, it, vi } from 'vitest';
import { type FleetReconcileDeps } from '../fleet/fleet-reconciler.js';
import { registerFleetCommand, type CommandResult, type FleetCommandDeps } from './fleet.js';

const roster = `
version: 2
generation: 7
transport: tmux
tmux:
  socket_name: mosaic-fleet
  holder_session: _holder
defaults:
  working_directory: /srv/mosaic
  runtime: pi
runtimes:
  pi:
    reset_command: /new
agents:
  - name: coder0
    alias: Coder 0
    class: code
    runtime: pi
    provider: openai
    model: gpt-5.6-sol
    reasoning: high
    tool_policy: code
    working_directory: /srv/mosaic
    persistent_persona: false
    reset_between_tasks: true
    lifecycle:
      enabled: true
      desired_state: stopped
    launch:
      yolo: true
`;

let cleanup: string | undefined;

afterEach(async (): Promise<void> => {
  vi.restoreAllMocks();
  process.exitCode = undefined;
  if (cleanup) await rm(cleanup, { recursive: true, force: true });
  cleanup = undefined;
});

async function fleetHome(): Promise<string> {
  cleanup = await mkdtemp(join(tmpdir(), 'mosaic-fleet-reconciler-command-'));
  for (const directory of ['fleet', 'fleet/agents', 'fleet/roles']) {
    await mkdir(join(cleanup, directory), { recursive: true, mode: 0o700 });
    await chmod(join(cleanup, directory), 0o700);
  }
  await chmod(cleanup, 0o700);
  await writeFile(join(cleanup, 'fleet', 'roster.yaml'), roster, { mode: 0o600 });
  await writeFile(join(cleanup, 'fleet', 'roles', 'code.md'), '# code\n\n(`class: code`)\n', {
    mode: 0o600,
  });
  return cleanup;
}

function program(
  mosaicHome: string,
  runner: FleetCommandDeps['runner'],
  reconcileOverrides: Partial<FleetReconcileDeps> = {},
): Command {
  const result = new Command();
  result.exitOverride();
  registerFleetCommand(result, {
    mosaicHome,
    runner,
    reconcileDeps: {
      homeDirectory: '/home/mosaic',
      readHolderIdentity: async () => '11111111-1111-4111-8111-111111111111',
      validateRoster: async () => undefined,
      prepareProjections: async () => [{ agentName: 'coder0' }],
      applyProjection: async () => undefined,
      ...reconcileOverrides,
    },
  });
  return result;
}

function capture(): string[] {
  const lines: string[] = [];
  vi.spyOn(console, 'log').mockImplementation((value: string): void => {
    lines.push(value);
  });
  return lines;
}

function ownedRunner(
  calls: string[][],
): (command: string, args: string[]) => Promise<CommandResult> {
  return async (command: string, args: string[]): Promise<CommandResult> => {
    calls.push([command, ...args]);
    if (command === 'tmux' && args.includes('list-sessions')) {
      return { stdout: '_holder\ncoder0\n', stderr: '', exitCode: 0 };
    }
    if (command === 'tmux' && args.includes('show-environment')) {
      return {
        stdout:
          'HOME=/home/mosaic\nMOSAIC_FLEET_OWNER=11111111-1111-4111-8111-111111111111\nMOSAIC_TMUX_HOLDER=_holder\nMOSAIC_TMUX_SOCKET=mosaic-fleet\nPATH=/usr/bin:/bin\nPWD=/home/mosaic\n',
        stderr: '',
        exitCode: 0,
      };
    }
    return { stdout: '', stderr: '', exitCode: 0 };
  };
}

describe('mosaic fleet reconciler commands', (): void => {
  it('plans apply as stable JSON without applying projections or lifecycle effects', async (): Promise<void> => {
    const home = await fleetHome();
    const calls: string[][] = [];
    const lines = capture();

    await program(home, ownedRunner(calls)).parseAsync([
      'node',
      'mosaic',
      'fleet',
      'apply',
      '--expected-generation',
      '7',
      '--dry-run',
    ]);

    expect(JSON.parse(lines.pop() ?? '')).toMatchObject({
      applied: false,
      authoritativeRoster: 'unchanged',
      projections: 'not-applied',
      lifecycle: 'not-applied',
    });
    expect(calls).not.toContainEqual([
      'systemctl',
      '--user',
      'start',
      'mosaic-agent@coder0.service',
    ]);
  });

  it('uses direct fleet status and doctor as observational JSON commands', async (): Promise<void> => {
    const home = await fleetHome();
    const lines = capture();
    const calls: string[][] = [];
    const cli = program(home, ownedRunner(calls));

    await cli.parseAsync(['node', 'mosaic', 'fleet', 'status', 'coder0']);
    await cli.parseAsync(['node', 'mosaic', 'fleet', 'doctor']);

    expect(lines.map((line: string): unknown => JSON.parse(line))).toMatchObject([
      { applied: false, lifecycle: 'not-applied' },
      { applied: false, lifecycle: 'not-applied' },
    ]);
    expect(
      calls.every((call: string[]): boolean => call[0] !== 'systemctl' || call[2] === 'show'),
    ).toBe(true);
  });

  it.each(['start', 'stop', 'restart'] as const)(
    'uses exact roster-owned systemd targeting for %s',
    async (operation: 'start' | 'stop' | 'restart'): Promise<void> => {
      const home = await fleetHome();
      const calls: string[][] = [];
      const lines = capture();

      await program(home, ownedRunner(calls)).parseAsync([
        'node',
        'mosaic',
        'fleet',
        operation,
        'coder0',
        '--expected-generation',
        '7',
      ]);

      expect(JSON.parse(lines.pop() ?? '')).toMatchObject({ applied: true, lifecycle: 'complete' });
      expect(calls).toContainEqual([
        'systemctl',
        '--user',
        operation,
        'mosaic-agent@coder0.service',
      ]);
      expect(calls.some((call: string[]): boolean => call.join(' ').includes('coder0-extra'))).toBe(
        false,
      );
    },
  );

  it('makes cleanup-incomplete effect JSON non-zero without losing effect truth', async (): Promise<void> => {
    const home = await fleetHome();
    const lines = capture();
    await program(home, ownedRunner([]), {
      acquireMutationLock: async () => async () => {
        throw new Error('cleanup failure');
      },
    }).parseAsync(['node', 'mosaic', 'fleet', 'apply', '--expected-generation', '7']);

    expect(JSON.parse(lines.pop() ?? '')).toMatchObject({
      applied: true,
      projections: 'complete',
      lifecycle: 'complete',
      cleanup: { code: 'lock-cleanup-failed', action: 'inspect-lock-before-retry' },
    });
    expect(process.exitCode).toBe(1);
  });

  it('keeps primary partial recovery JSON and exits non-zero when cleanup is also incomplete', async (): Promise<void> => {
    const cleanupFailure = async () => async () => {
      throw new Error('cleanup failure');
    };
    const projectionHome = await fleetHome();
    const projectionLines = capture();
    await program(projectionHome, ownedRunner([]), {
      applyProjection: async () => {
        throw new Error('projection failure');
      },
      acquireMutationLock: cleanupFailure,
    }).parseAsync(['node', 'mosaic', 'fleet', 'apply', '--expected-generation', '7']);
    expect(JSON.parse(projectionLines.pop() ?? '')).toMatchObject({
      projections: 'incomplete',
      lifecycle: 'not-applied',
      recovery: { code: 'projection-apply-failed' },
      cleanup: { code: 'lock-cleanup-failed' },
    });
    expect(process.exitCode).toBe(1);
  });

  it('keeps clean effect and observational commands at zero exit', async (): Promise<void> => {
    const home = await fleetHome();
    const cli = program(home, ownedRunner([]));
    await cli.parseAsync(['node', 'mosaic', 'fleet', 'apply', '--expected-generation', '7']);
    expect(process.exitCode).toBe(0);
    process.exitCode = undefined;
    await cli.parseAsync(['node', 'mosaic', 'fleet', 'status']);
    expect(process.exitCode).toBe(0);
  });

  it('rejects stale apply generations as non-zero redacted JSON', async (): Promise<void> => {
    const home = await fleetHome();
    const lines = capture();

    await program(home, ownedRunner([])).parseAsync([
      'node',
      'mosaic',
      'fleet',
      'apply',
      '--expected-generation',
      '6',
    ]);

    expect(JSON.parse(lines.pop() ?? '')).toEqual({ error: { code: 'stale-generation' } });
    expect(process.exitCode).toBe(1);
  });
});