import { mkdir, mkdtemp, readFile, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { dirname, join, resolve } from 'node:path';
import { Command } from 'commander';
import { afterEach, describe, expect, it, vi } from 'vitest';
import {
  buildAgentSendCommand,
  buildFleetServiceCommand,
  generateAgentEnv,
  getDefaultOperatorSourceLabel,
  getRosterAgent,
  loadFleetRoster,
  mergeAgentEnv,
  registerFleetCommand,
  resolveFleetPaths,
  type CommandRunner,
} from './fleet.js';
import { registerAgentCommand } from './agent.js';

function buildProgram(): Command {
  const program = new Command();
  program.exitOverride();
  registerFleetCommand(program);
  registerAgentCommand(program);
  return program;
}

async function tempDir(): Promise<string> {
  return mkdtemp(join(tmpdir(), 'mosaic-fleet-'));
}

describe('registerFleetCommand', () => {
  it('registers local canary fleet subcommands', () => {
    const program = buildProgram();
    const fleet = program.commands.find((command) => command.name() === 'fleet');

    expect(fleet).toBeDefined();
    expect(fleet!.commands.map((command) => command.name()).sort()).toEqual([
      'init',
      'install',
      'install-systemd',
      'restart',
      'start',
      'status',
      'stop',
      'verify',
    ]);
  });

  it('adds fleet-backed agent subcommands without removing existing options', () => {
    const program = buildProgram();
    const agent = program.commands.find((command) => command.name() === 'agent');

    expect(agent).toBeDefined();
    expect(agent!.options.map((option) => option.long)).toContain('--list');
    expect(agent!.commands.map((command) => command.name()).sort()).toEqual([
      'reset',
      'roster',
      'send',
      'status',
      'tail',
    ]);
  });
});

describe('fleet roster parsing', () => {
  let cleanup: string | undefined;

  afterEach(async () => {
    if (cleanup) {
      await rm(cleanup, { recursive: true, force: true });
      cleanup = undefined;
    }
  });

  it('defaults local canary rosters to the isolated mosaic-factory socket', async () => {
    cleanup = await tempDir();
    const rosterPath = join(cleanup, 'roster.yaml');
    await writeFile(
      rosterPath,
      [
        'version: 1',
        'transport: tmux',
        'agents:',
        '  - name: canary-pi',
        '    runtime: pi',
        '    class: canary',
      ].join('\n'),
    );

    const roster = await loadFleetRoster(rosterPath);

    expect(roster.tmux.socketName).toBe('mosaic-factory');
    expect(roster.tmux.holderSession).toBe('_holder');
    expect(roster.agents).toHaveLength(1);
    expect(getRosterAgent(roster, 'canary-pi').runtime).toBe('pi');
  });

  it('generates deterministic per-agent EnvironmentFile content', async () => {
    cleanup = await tempDir();
    const rosterPath = join(cleanup, 'roster.json');
    await writeFile(
      rosterPath,
      JSON.stringify({
        version: 1,
        transport: 'tmux',
        tmux: { socket_name: 'mosaic-factory' },
        defaults: { working_directory: '/srv/mosaic' },
        agents: [{ name: 'coder0', runtime: 'codex', class: 'implementer' }],
      }),
    );
    const roster = await loadFleetRoster(rosterPath);

    expect(generateAgentEnv(roster, getRosterAgent(roster, 'coder0'))).toBe(
      [
        'MOSAIC_AGENT_NAME=coder0',
        'MOSAIC_AGENT_RUNTIME=codex',
        'MOSAIC_AGENT_WORKDIR=/srv/mosaic',
        'MOSAIC_TMUX_SOCKET=mosaic-factory',
        '',
      ].join('\n'),
    );
  });

  it('preserves site-owned agent EnvironmentFile overrides while refreshing roster keys', () => {
    const generated = [
      'MOSAIC_AGENT_NAME=coder0',
      'MOSAIC_AGENT_RUNTIME=codex',
      'MOSAIC_AGENT_WORKDIR=/srv/new',
      'MOSAIC_TMUX_SOCKET=mosaic-factory',
      '',
    ].join('\n');
    const existing = [
      'MOSAIC_AGENT_NAME=old-name',
      'MOSAIC_AGENT_RUNTIME=old-runtime',
      'MOSAIC_AGENT_WORKDIR=/srv/old',
      'MOSAIC_TMUX_SOCKET=old-socket',
      'MOSAIC_AGENT_COMMAND=/home/jarvis/.config/mosaic/fleet/canary.sh',
      '# site note',
      '',
    ].join('\n');

    expect(mergeAgentEnv(generated, existing)).toBe(
      [
        'MOSAIC_AGENT_NAME=coder0',
        'MOSAIC_AGENT_RUNTIME=codex',
        'MOSAIC_AGENT_WORKDIR=/srv/new',
        'MOSAIC_TMUX_SOCKET=mosaic-factory',
        'MOSAIC_AGENT_COMMAND=/home/jarvis/.config/mosaic/fleet/canary.sh',
        '# site note',
        '',
      ].join('\n'),
    );
  });

  it('rejects unknown roster fields instead of silently defaulting', async () => {
    cleanup = await tempDir();
    const rosterPath = join(cleanup, 'roster.yaml');
    await writeFile(
      rosterPath,
      [
        'version: 1',
        'transport: tmux',
        'tmux:',
        '  socketNamee: prod-fleet',
        'agents:',
        '  - name: canary-pi',
        '    runtime: pi',
      ].join('\n'),
    );

    await expect(loadFleetRoster(rosterPath)).rejects.toThrow(
      'Fleet roster tmux has unknown field(s): socketNamee.',
    );
  });

  it('rejects wrong-typed roster fields instead of silently defaulting', async () => {
    cleanup = await tempDir();
    const rosterPath = join(cleanup, 'roster.json');
    await writeFile(
      rosterPath,
      JSON.stringify({
        version: 1,
        transport: 'tmux',
        tmux: { socket_name: 123 },
        defaults: { working_directory: '/srv/mosaic' },
        agents: [{ name: 'canary-pi', runtime: 'pi' }],
      }),
    );

    await expect(loadFleetRoster(rosterPath)).rejects.toThrow(
      'Fleet roster tmux socket_name must be a string.',
    );
  });

  it('rejects wrong-typed agent fields', async () => {
    cleanup = await tempDir();
    const rosterPath = join(cleanup, 'roster.json');
    await writeFile(
      rosterPath,
      JSON.stringify({
        version: 1,
        transport: 'tmux',
        agents: [{ name: 'canary-pi', runtime: 42 }],
      }),
    );

    await expect(loadFleetRoster(rosterPath)).rejects.toThrow(
      'Fleet roster agent "canary-pi" runtime must be a string.',
    );
  });

  it('rejects duplicate agent names before install can overwrite env files', async () => {
    cleanup = await tempDir();
    const rosterPath = join(cleanup, 'roster.yaml');
    await writeFile(
      rosterPath,
      [
        'version: 1',
        'transport: tmux',
        'agents:',
        '  - name: canary-pi',
        '    runtime: pi',
        '  - name: canary-pi',
        '    runtime: codex',
      ].join('\n'),
    );

    await expect(loadFleetRoster(rosterPath)).rejects.toThrow(
      'Fleet roster has duplicate agent name: canary-pi.',
    );
  });

  it('ships generic minimal and local-canary examples without site-specific defaults', async () => {
    const examplesDir = resolve(process.cwd(), 'framework', 'fleet', 'examples');
    const minimal = await loadFleetRoster(join(examplesDir, 'minimal.yaml'));
    const localCanaryText = await readFile(join(examplesDir, 'local-canary.yaml'), 'utf8');
    const localCanary = await loadFleetRoster(join(examplesDir, 'local-canary.yaml'));

    expect(minimal.agents.map((agent) => agent.name)).toEqual(['canary-pi']);
    expect(localCanary.tmux.socketName).toBe('mosaic-factory');
    expect(localCanary.agents.map((agent) => agent.name)).toEqual(['lead', 'coder0', 'reviewer0']);
    expect(localCanaryText).not.toMatch(/usc|ultron|secrev/i);
  });
});

describe('fleet command construction', () => {
  it('builds exact systemd user commands for holder and agent operations', () => {
    expect(buildFleetServiceCommand('status')).toEqual([
      'systemctl',
      '--user',
      'status',
      'mosaic-tmux-holder.service',
    ]);
    expect(buildFleetServiceCommand('restart', 'coder0')).toEqual([
      'systemctl',
      '--user',
      'restart',
      'mosaic-agent@coder0.service',
    ]);
  });

  it('builds socket-scoped agent send commands', () => {
    const paths = resolveFleetPaths('/home/test/.config/mosaic');
    expect(
      buildAgentSendCommand(paths, 'coder0', 'hello', 'mosaic-factory', 'operator:mosaic-cli'),
    ).toEqual([
      '/home/test/.config/mosaic/tools/tmux/agent-send.sh',
      '-L',
      'mosaic-factory',
      '-S',
      'operator:mosaic-cli',
      '-s',
      'coder0',
      '-m',
      'hello',
    ]);
  });

  it('runs fleet status through injected runner without touching tmux in tests', async () => {
    const calls: string[][] = [];
    const runner: CommandRunner = async (command, args) => {
      calls.push([command, ...args]);
      return { stdout: 'ok\n', stderr: '', exitCode: 0 };
    };
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { runner });

    await program.parseAsync(['node', 'mosaic', 'fleet', 'status']);

    expect(calls).toEqual([['systemctl', '--user', 'status', 'mosaic-tmux-holder.service']]);
  });

  it('verifies liveness with tmux has-session and does not trust systemd active exited', async () => {
    const home = await tempDir();
    const rosterPath = join(home, 'fleet', 'roster.yaml');
    await mkdir(join(home, 'fleet'), { recursive: true });
    await writeFile(
      rosterPath,
      ['version: 1', 'transport: tmux', 'agents:', '  - name: coder0', '    runtime: codex'].join(
        '\n',
      ),
    );
    const calls: string[][] = [];
    const runner: CommandRunner = async (command, args) => {
      calls.push([command, ...args]);
      return { stdout: 'active (exited)\n', stderr: '', exitCode: 0 };
    };
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { runner, mosaicHome: home });

    try {
      await program.parseAsync(['node', 'mosaic', 'fleet', 'verify']);
      expect(calls).toEqual([
        ['tmux', '-L', 'mosaic-factory', 'has-session', '-t', '=_holder:0.0'],
        ['tmux', '-L', 'mosaic-factory', 'has-session', '-t', '=coder0:0.0'],
      ]);
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('writes init output to the explicit roster path', async () => {
    const home = await tempDir();
    const rosterPath = join(home, 'custom', 'roster.yaml');
    const frameworkRoot = resolve(process.cwd(), 'framework');
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { frameworkRoot, mosaicHome: home });

    try {
      await program.parseAsync([
        'node',
        'mosaic',
        'fleet',
        '--roster',
        rosterPath,
        'init',
        '--profile',
        'minimal',
        '--write',
      ]);

      const content = await readFile(rosterPath, 'utf8');
      expect(content).toContain('name: canary-pi');
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('refuses to overwrite an existing roster unless --force is provided', async () => {
    const home = await tempDir();
    const rosterPath = join(home, 'custom', 'roster.yaml');
    await mkdir(dirname(rosterPath), { recursive: true });
    await writeFile(rosterPath, 'site-owned: true\n');
    const frameworkRoot = resolve(process.cwd(), 'framework');
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { frameworkRoot, mosaicHome: home });

    try {
      await expect(
        program.parseAsync([
          'node',
          'mosaic',
          'fleet',
          '--roster',
          rosterPath,
          'init',
          '--profile',
          'minimal',
          '--write',
        ]),
      ).rejects.toThrow('Fleet roster already exists');
      expect(await readFile(rosterPath, 'utf8')).toBe('site-owned: true\n');

      await program.parseAsync([
        'node',
        'mosaic',
        'fleet',
        '--roster',
        rosterPath,
        'init',
        '--profile',
        'minimal',
        '--write',
        '--force',
      ]);
      expect(await readFile(rosterPath, 'utf8')).toContain('name: canary-pi');
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('rejects unknown init profiles instead of silently falling back', async () => {
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { frameworkRoot: resolve(process.cwd(), 'framework') });

    await expect(
      program.parseAsync(['node', 'mosaic', 'fleet', 'init', '--profile', 'typo']),
    ).rejects.toThrow('Unsupported fleet profile');
  });

  it('sets process exitCode when status runner fails', async () => {
    const originalExitCode = process.exitCode;
    const stderrSpy = vi.spyOn(process.stderr, 'write').mockImplementation(() => true);
    const runner: CommandRunner = async () => ({ stdout: '', stderr: 'missing\n', exitCode: 3 });
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { runner });

    try {
      await program.parseAsync(['node', 'mosaic', 'fleet', 'status']);
      expect(process.exitCode).toBe(3);
    } finally {
      process.exitCode = originalExitCode;
      stderrSpy.mockRestore();
    }
  });

  it('loads default fleet/roster.json when roster.yaml is absent', async () => {
    const home = await tempDir();
    await mkdir(join(home, 'fleet'), { recursive: true });
    await writeFile(
      join(home, 'fleet', 'roster.json'),
      JSON.stringify({
        version: 1,
        transport: 'tmux',
        agents: [{ name: 'json-canary', runtime: 'pi' }],
      }),
    );
    const calls: string[][] = [];
    const runner: CommandRunner = async (command, args) => {
      calls.push([command, ...args]);
      return { stdout: '', stderr: '', exitCode: 0 };
    };
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { runner, mosaicHome: home });

    try {
      await program.parseAsync(['node', 'mosaic', 'fleet', 'status', 'json-canary']);
      expect(calls).toEqual([
        ['systemctl', '--user', 'status', 'mosaic-agent@json-canary.service'],
      ]);
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('starts the holder before agents and stops agents before the holder', async () => {
    const home = await tempDir();
    const rosterPath = join(home, 'fleet', 'roster.yaml');
    await mkdir(join(home, 'fleet'), { recursive: true });
    await writeFile(
      rosterPath,
      ['version: 1', 'transport: tmux', 'agents:', '  - name: coder0', '    runtime: codex'].join(
        '\n',
      ),
    );
    const calls: string[][] = [];
    const runner: CommandRunner = async (command, args) => {
      calls.push([command, ...args]);
      return { stdout: '', stderr: '', exitCode: 0 };
    };
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { runner, mosaicHome: home });

    try {
      await program.parseAsync(['node', 'mosaic', 'fleet', 'start']);
      await program.parseAsync(['node', 'mosaic', 'fleet', 'stop']);

      expect(calls).toEqual([
        ['systemctl', '--user', 'start', 'mosaic-tmux-holder.service'],
        ['systemctl', '--user', 'start', 'mosaic-agent@coder0.service'],
        ['systemctl', '--user', 'stop', 'mosaic-agent@coder0.service'],
        ['systemctl', '--user', 'stop', 'mosaic-tmux-holder.service'],
      ]);
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('attempts every agent and the holder during fleet stop even when an agent stop fails', async () => {
    const home = await tempDir();
    const rosterPath = join(home, 'fleet', 'roster.yaml');
    await mkdir(join(home, 'fleet'), { recursive: true });
    await writeFile(
      rosterPath,
      [
        'version: 1',
        'transport: tmux',
        'agents:',
        '  - name: coder0',
        '    runtime: codex',
        '  - name: reviewer0',
        '    runtime: pi',
      ].join('\n'),
    );
    const calls: string[][] = [];
    const runner: CommandRunner = async (command, args) => {
      calls.push([command, ...args]);
      if (args.includes('mosaic-agent@coder0.service')) {
        return { stdout: '', stderr: 'coder0 failed\n', exitCode: 1 };
      }
      return { stdout: '', stderr: '', exitCode: 0 };
    };
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, { runner, mosaicHome: home });

    try {
      await expect(program.parseAsync(['node', 'mosaic', 'fleet', 'stop'])).rejects.toThrow(
        'Fleet stop completed with 1 failure(s)',
      );
      expect(calls).toEqual([
        ['systemctl', '--user', 'stop', 'mosaic-agent@coder0.service'],
        ['systemctl', '--user', 'stop', 'mosaic-agent@reviewer0.service'],
        ['systemctl', '--user', 'stop', 'mosaic-tmux-holder.service'],
      ]);
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('rejects install-systemd with a non-default Mosaic home because units use %h/.config/mosaic', async () => {
    const home = await tempDir();
    const program = new Command();
    program.exitOverride();
    registerFleetCommand(program, {
      mosaicHome: home,
      frameworkRoot: resolve(process.cwd(), 'framework'),
    });

    try {
      await expect(
        program.parseAsync(['node', 'mosaic', 'fleet', 'install-systemd']),
      ).rejects.toThrow('install-systemd only supports the default Mosaic home');
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it.each(['start', 'stop', 'restart', 'status'] as const)(
    'rejects single-agent %s for agents outside the roster',
    async (action) => {
      const home = await tempDir();
      const rosterPath = join(home, 'fleet', 'roster.yaml');
      await mkdir(join(home, 'fleet'), { recursive: true });
      await writeFile(
        rosterPath,
        ['version: 1', 'transport: tmux', 'agents:', '  - name: coder0', '    runtime: codex'].join(
          '\n',
        ),
      );
      const runner = vi.fn<CommandRunner>(async () => ({ stdout: '', stderr: '', exitCode: 0 }));
      const program = new Command();
      program.exitOverride();
      registerFleetCommand(program, { runner, mosaicHome: home });

      try {
        await expect(
          program.parseAsync(['node', 'mosaic', 'fleet', action, 'typo']),
        ).rejects.toThrow('Agent "typo" is not in the fleet roster');
        expect(runner).not.toHaveBeenCalled();
      } finally {
        await rm(home, { recursive: true, force: true });
      }
    },
  );

  it('loads default fleet/roster.json for agent commands when roster.yaml is absent', async () => {
    const home = await tempDir();
    await mkdir(join(home, 'fleet'), { recursive: true });
    await writeFile(
      join(home, 'fleet', 'roster.json'),
      JSON.stringify({
        version: 1,
        transport: 'tmux',
        agents: [{ name: 'json-agent', runtime: 'pi' }],
      }),
    );
    const calls: string[][] = [];
    const runner: CommandRunner = async (command, args) => {
      calls.push([command, ...args]);
      return { stdout: '', stderr: '', exitCode: 0 };
    };
    const program = new Command();
    program.exitOverride();
    registerAgentCommand(program, { runner, mosaicHome: home });

    try {
      await program.parseAsync(['node', 'mosaic', 'agent', 'status', 'json-agent']);
      expect(calls).toEqual([
        ['tmux', '-L', 'mosaic-factory', 'has-session', '-t', '=json-agent:0.0'],
      ]);
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('passes a deterministic operator source label for agent sends', async () => {
    const home = await tempDir();
    await mkdir(join(home, 'fleet'), { recursive: true });
    await writeFile(
      join(home, 'fleet', 'roster.yaml'),
      JSON.stringify({
        version: 1,
        transport: 'tmux',
        agents: [{ name: 'json-agent', runtime: 'pi' }],
      }),
    );
    const calls: string[][] = [];
    const runner: CommandRunner = async (command, args) => {
      calls.push([command, ...args]);
      return { stdout: '', stderr: '', exitCode: 0 };
    };
    const program = new Command();
    program.exitOverride();
    registerAgentCommand(program, { runner, mosaicHome: home });

    try {
      await program.parseAsync([
        'node',
        'mosaic',
        'agent',
        'send',
        'json-agent',
        '--message',
        'status check',
      ]);
      expect(calls).toEqual([
        [
          join(home, 'tools', 'tmux', 'agent-send.sh'),
          '-L',
          'mosaic-factory',
          '-S',
          getDefaultOperatorSourceLabel(),
          '-s',
          'json-agent',
          '-m',
          'status check',
        ],
      ]);
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('allows agent sends to override the source label explicitly', async () => {
    const home = await tempDir();
    await mkdir(join(home, 'fleet'), { recursive: true });
    await writeFile(
      join(home, 'fleet', 'roster.yaml'),
      JSON.stringify({
        version: 1,
        transport: 'tmux',
        agents: [{ name: 'coder0', runtime: 'codex' }],
      }),
    );
    const calls: string[][] = [];
    const runner: CommandRunner = async (command, args) => {
      calls.push([command, ...args]);
      return { stdout: '', stderr: '', exitCode: 0 };
    };
    const program = new Command();
    program.exitOverride();
    registerAgentCommand(program, { runner, mosaicHome: home });

    try {
      await program.parseAsync([
        'node',
        'mosaic',
        'agent',
        'send',
        'coder0',
        '--message',
        'handoff',
        '--source-label',
        'lead:manual',
      ]);
      expect(calls).toEqual([
        [
          join(home, 'tools', 'tmux', 'agent-send.sh'),
          '-L',
          'mosaic-factory',
          '-S',
          'lead:manual',
          '-s',
          'coder0',
          '-m',
          'handoff',
        ],
      ]);
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('rejects agent status typos before invoking the runner', async () => {
    const home = await tempDir();
    const rosterPath = join(home, 'fleet', 'roster.yaml');
    await mkdir(join(home, 'fleet'), { recursive: true });
    await writeFile(
      rosterPath,
      ['version: 1', 'transport: tmux', 'agents:', '  - name: coder0', '    runtime: codex'].join(
        '\n',
      ),
    );
    const runner = vi.fn<CommandRunner>(async () => ({ stdout: '', stderr: '', exitCode: 0 }));
    const program = new Command();
    program.exitOverride();
    registerAgentCommand(program, { runner, mosaicHome: home });

    try {
      await expect(
        program.parseAsync(['node', 'mosaic', 'agent', 'status', 'typo']),
      ).rejects.toThrow('Agent "typo" is not in the fleet roster');
      expect(runner).not.toHaveBeenCalled();
    } finally {
      await rm(home, { recursive: true, force: true });
    }
  });

  it('keeps fleet framework assets in the published package file list', async () => {
    const packageJson = JSON.parse(
      await readFile(resolve(process.cwd(), 'package.json'), 'utf8'),
    ) as {
      files?: string[];
    };

    expect(packageJson.files).toEqual(expect.arrayContaining(['dist', 'framework']));
  });
});