import assert from 'node:assert/strict'
import { execFileSync } from 'node:child_process'
import { existsSync, mkdtempSync, writeFileSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { test } from 'node:test'

import { renderSlopoConfig } from '../lib/config.js'
import {
  commandLine,
  explainFailure,
  findSlopo,
  installEnv,
  lastLogError,
  shellQuote,
  slopoArgs,
  slopoCandidates,
  uvInstallArgs,
} from '../lib/slopo.js'
import { managedSlopoPath, resolveDshHome, workspaceKey, workspaceStateDir } from '../lib/paths.js'

test('findSlopo prefers the managed install over PATH', () => {
  const home = '/dsh'
  const env = { PATH: '/usr/bin:/bin' }
  const candidates = slopoCandidates(home, env)
  const managed = candidates.indexOf(managedSlopoPath(home))
  const onPath = candidates.indexOf('/usr/bin/slopo')
  assert.ok(managed >= 0 && onPath >= 0)
  assert.ok(managed < onPath, 'managed install must be probed before PATH')
  assert.equal(findSlopo(home, env, (p) => p === '/bin/slopo'), '/bin/slopo')
  assert.equal(findSlopo(home, env, () => false), undefined)
})

test('findSlopo honours an explicit binary, including one not on PATH', () => {
  const env = { PATH: '', DSH_SLOPO_BINARY: '/opt/custom/slopo' }
  assert.equal(findSlopo('/dsh', env, (p) => p === '/opt/custom/slopo'), '/opt/custom/slopo')
})

test('installEnv redirects all three uv directories into the harness home', () => {
  const env = installEnv('/dsh', { PATH: '/usr/bin' })
  assert.equal(env.UV_TOOL_DIR, '/dsh/dsh-slopo/uv-tools')
  assert.equal(env.UV_TOOL_BIN_DIR, '/dsh/dsh-slopo/uv-tools/bin')
  assert.equal(env.UV_PYTHON_INSTALL_DIR, '/dsh/dsh-slopo/uv-python')
  // The parent environment must survive, or PATH is lost for the install.
  assert.equal(env.PATH, '/usr/bin')
})

test('uvInstallArgs pins the interpreter slopo requires', () => {
  assert.deepEqual(uvInstallArgs(), ['tool', 'install', 'slopo', '--python', '3.12'])
  assert.deepEqual(uvInstallArgs({ upgrade: true }), ['tool', 'install', 'slopo', '--python', '3.12', '--upgrade'])
  assert.deepEqual(uvInstallArgs({ version: 'v0.8.0' }), ['tool', 'install', 'slopo==0.8.0', '--python', '3.12'])
})

test('shellQuote survives a single quote in a path', () => {
  assert.equal(shellQuote("/tmp/it's here"), `'/tmp/it'\\''s here'`)
  assert.equal(commandLine(['/bin/x', 'a b']), `'/bin/x' 'a b'`)
})

test('slopoArgs puts the global --config before the subcommand', () => {
  // typer only accepts a callback option ahead of the command; verified against slopo 0.8.0.
  for (const action of ['review', 'analyze', 'index', 'show-config']) {
    const args = slopoArgs('/c.yaml', action)
    assert.equal(args[0], '--config')
    assert.equal(args[1], '/c.yaml')
    assert.ok(args.findIndex((a) => a.startsWith('agent-') || a === 'index' || a === 'show-config') > 1)
  }
})

test('--config-version is a subcommand option, so it must FOLLOW the subcommand', () => {
  // Found the hard way: slopo exits 2 (a typer usage error) when --config-version
  // precedes the command, because it is declared on the command, not the callback.
  for (const action of ['review', 'analyze', 'analyze-one']) {
    const args = slopoArgs('/c.yaml', action)
    const commandAt = args.findIndex((a) => a.startsWith('agent-'))
    const versionAt = args.indexOf('--config-version')
    assert.ok(commandAt > 0, action)
    assert.ok(versionAt > commandAt, `${action}: --config-version must follow the subcommand`)
  }
})

test('slopoArgs passes the config-version alarm on agent commands only', () => {
  assert.ok(slopoArgs('/c.yaml', 'review').includes('--config-version'))
  // index/embed are not agent commands and take no version flag.
  assert.ok(!slopoArgs('/c.yaml', 'index').includes('--config-version'))
})

test('slopoArgs maps arguments, and omits them when empty', () => {
  assert.deepEqual(slopoArgs('/c.yaml', 'review', { base: 'main' }).slice(-2), ['--base', 'main'])
  assert.ok(!slopoArgs('/c.yaml', 'review', { base: '' }).includes('--base'))
  assert.deepEqual(slopoArgs('/c.yaml', 'analyze-one', { cluster: 'abc' }).slice(-3), ['--single', '--cluster', 'abc'])
  assert.ok(!slopoArgs('/c.yaml', 'analyze-one').includes('--cluster'))
})

test('slopoArgs refuses an unknown action rather than running something else', () => {
  assert.throws(() => slopoArgs('/c.yaml', 'delete-everything'), /unknown slopo action/)
})

test('explainFailure turns each observed slopo message into an action', () => {
  const cases = [
    ['Error: No data in database. The tool wasn\'t initialized.', 'DATABASE_MISSING'],
    ['Error: Configuration mismatch.', 'CONFIGURATION_MISMATCH'],
    ['Error: Too many code units to embed. The tool probably wasn\'t fully initialized.', 'BACKLOG_TOO_LARGE'],
    ['Error: Configuration file not found. Make sure that the agent CLI is run from the correct directory.', 'CONFIG_MISSING'],
    ['Error: Loading configuration failed.', 'CONFIG_INVALID'],
    ['Error: Index is out of date. Run `index` and `embed` first.', 'INDEX_STALE'],
    ['Error: Git command failed.', 'GIT_FAILED'],
    ['Error: Embedding failed.', 'EMBEDDING_FAILED'],
    ['Error: something nobody has seen before', 'SLOPO_FAILED'],
  ]
  for (const [stderr, code] of cases) {
    const explained = explainFailure({ stderr, stdout: '' })
    assert.equal(explained.code, code, stderr)
    assert.ok(explained.message.length > 0)
    assert.ok(explained.remedy.length > 0)
  }
})

test('explainFailure reads the real detail out of the log, not just stderr', () => {
  // This is the genuine shape: stderr is deliberately terse, the log is not.
  const explained = explainFailure({
    stderr: 'Error: Embedding failed.',
    stdout: '',
    logDetail: 'Error: litellm.UnsupportedParamsError: Setting dimensions is not supported',
  })
  assert.equal(explained.code, 'EMBEDDING_FAILED')
})

test('lastLogError returns the most recent error line', () => {
  const log = [
    '==== 2026-01-01 00:00:00 agent-review ====',
    'Error: first problem',
    '> index',
    'Indexed 3 code units',
    'Error: litellm.UnsupportedParamsError: Setting dimensions is not supported',
  ].join('\n')
  assert.match(lastLogError(log), /UnsupportedParamsError/)
  assert.equal(lastLogError('no errors here'), '')
})

test('workspaceKey is stable, name-bearing and collision-resistant', () => {
  assert.equal(workspaceKey('/a/b/app'), workspaceKey('/a/b/app'))
  assert.notEqual(workspaceKey('/a/b/app'), workspaceKey('/x/y/app'))
  assert.match(workspaceKey('/a/b/app'), /^app-[0-9a-f]{8}$/)
})

test('resolveDshHome prefers $DSH_HOME and rejects a blank one', () => {
  assert.equal(resolveDshHome({ DSH_HOME: '/persist/.dsh' }), '/persist/.dsh')
  assert.match(resolveDshHome({ DSH_HOME: '   ' }), /\.dsh$/)
})

test('workspace state lives under the harness home, not next to the code', () => {
  assert.match(workspaceStateDir('/dsh', '/repo'), /^\/dsh\/dsh-slopo\/workspaces\/repo-[0-9a-f]{8}$/)
})

test('the generated config is accepted by the real slopo', { skip: !existsSync(managedSlopoPath('/root/.dsh')) && !existsSync('/root/.local/bin/slopo') }, () => {
  const binary = findSlopo('/root/.dsh')
  assert.ok(binary, 'expected a slopo binary for this test')
  const dir = mkdtempSync(join(tmpdir(), 'dsh-slopo-conf-'))
  const configPath = join(dir, 'slopo.conf.yaml')
  writeFileSync(
    configPath,
    renderSlopoConfig({
      source_dir: dir,
      db_file: join(dir, 'slopo.db'),
      ignore_file: join(dir, 'slopo.ignore.txt'),
      agent_log_file: join(dir, 'slopo.agent.log'),
      embedding_model: 'ollama/example:latest',
      embedding_dimensions: 768,
      embedding_params: { api_base: 'http://127.0.0.1:11434' },
      source_dir_exclude: ['**/test/**'],
    }),
  )
  const out = execFileSync(binary, ['--config', configPath, 'show-config'], { encoding: 'utf8' })
  assert.match(out, /embedding_model: ollama\/example:latest/)
  assert.match(out, /embedding_dimensions: 768/)
  assert.match(out, /api_base: http:\/\/127\.0\.0\.1:11434/)
})