import { describe, it, expect } from 'vitest'
import { expandSnippetVariables } from '../../src/utils/snippetVariables'
import { applyKeywordHighlights, DEFAULT_KEYWORD_HIGHLIGHT_RULES } from '../../src/utils/keywordHighlight'
import {
  StreamingKeywordHighlight,
  trailingIncompleteEscape,
} from '../../src/utils/streamingKeywordHighlight'
import { localShellEnterKey, normalizeTerminalInject } from '../../src/utils/platformShells'

describe('expandSnippetVariables', () => {
  it('replaces known placeholders', () => {
    const out = expandSnippetVariables('ssh {{username}}@{{host}}:{{port}}', {
      username: 'root',
      host: '10.0.0.1',
      port: 22,
    })
    expect(out).toBe('ssh root@10.0.0.1:22')
  })

  it('uses default when missing', () => {
    const out = expandSnippetVariables('cd {{path:/tmp}}', {})
    expect(out).toBe('cd /tmp')
  })

  it('keeps unknown placeholders without default', () => {
    const out = expandSnippetVariables('echo {{unknown}}', {})
    expect(out).toBe('echo {{unknown}}')
  })
})

describe('applyKeywordHighlights', () => {
  it('highlights error keywords', () => {
    const out = applyKeywordHighlights('FATAL error happened', DEFAULT_KEYWORD_HIGHLIGHT_RULES)
    expect(out).toContain('\x1b[')
    expect(out).toContain('FATAL')
  })

  it('returns original when disabled rules only', () => {
    const rules = DEFAULT_KEYWORD_HIGHLIGHT_RULES.map((r) => ({ ...r, enabled: false }))
    const text = 'no highlight'
    expect(applyKeywordHighlights(text, rules)).toBe(text)
  })

  it('does not inject SGR inside OSC window-title sequences (SSH title leak)', () => {
    const rules = [
      {
        id: 'ipv4',
        label: 'IPv4',
        pattern: '\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b',
        isRegex: true,
        color: '#8be9fd',
        enabled: true,
      },
    ]
    const osc = '\x1b]0;ssh root@165.154.155.48\x07'
    const out = applyKeywordHighlights(`${osc}Welcome to Ubuntu`, rules)
    expect(out).toContain(osc)
    expect(out).not.toMatch(/\x1b\]0;.*\x1b\[38/) // eslint-disable-line no-control-regex -- OSC must stay intact
    expect(out).toContain('Welcome to Ubuntu')
  })

  it('still highlights IPs in plain text when the ipv4 rule is enabled', () => {
    const rules = [
      {
        id: 'ipv4',
        label: 'IPv4',
        pattern: '\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b',
        isRegex: true,
        color: '#8be9fd',
        enabled: true,
      },
    ]
    const out = applyKeywordHighlights('peer 10.0.0.1 online', rules)
    expect(out).toContain('\x1b[38;2;')
    expect(out).toContain('10.0.0.1')
    expect(out).toContain('\x1b[39m')
  })

  it('leaves existing CSI color sequences intact', () => {
    const colored = '\x1b[01;32mroot\x1b[00m@host'
    const out = applyKeywordHighlights(colored, DEFAULT_KEYWORD_HIGHLIGHT_RULES)
    expect(out).toContain('\x1b[01;32mroot\x1b[00m')
  })
})

describe('StreamingKeywordHighlight', () => {
  const ipv4Rules = [
    {
      id: 'ipv4',
      label: 'IPv4',
      pattern: '\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b',
      isRegex: true,
      color: '#8be9fd',
      enabled: true,
    },
  ]

  it('holds incomplete OSC across chunks', () => {
    expect(trailingIncompleteEscape('\x1b]0;ssh root@1.2.3.4')).toBe('\x1b]0;ssh root@1.2.3.4')
    const stream = new StreamingKeywordHighlight()
    expect(stream.push('\x1b]0;ssh root@1.2.3.4', ipv4Rules)).toBe('')
    const done = stream.push('\x07Welcome', ipv4Rules)
    expect(done).toContain('\x1b]0;ssh root@1.2.3.4\x07')
    expect(done).toContain('Welcome')
    expect(done).not.toMatch(/\x1b\]0;.*\x1b\[38/) // eslint-disable-line no-control-regex -- OSC must stay intact
  })

  it('holds incomplete CSI across chunks', () => {
    const stream = new StreamingKeywordHighlight()
    expect(stream.push('\x1b[38;2;139', ipv4Rules)).toBe('')
    const out = stream.push(';233;253m10.0.0.1 done', ipv4Rules)
    expect(out.startsWith('\x1b[38;2;139;233;253m')).toBe(true)
  })
})

describe('normalizeTerminalInject', () => {
  it('converts LF to CR like xterm paste', () => {
    expect(normalizeTerminalInject('echo hi\n', '')).toBe('echo hi\r')
    expect(normalizeTerminalInject('echo hi', '\r')).toBe('echo hi\r')
  })

  it('uses CR enter for unix local shells', () => {
    expect(localShellEnterKey('zsh')).toBe('\r')
    expect(localShellEnterKey('pwsh')).toBe('\r\n')
  })
})