import fs from 'node:fs'
import path from 'node:path'

const root = process.cwd()
const sourcePath = path.join(root, 'packages/kbx-ui/src/tokens/source/kbx.tokens.json')
const cssPath = path.join(root, 'packages/kbx-ui/src/tokens/kbx.css')
const manifestPath = path.join(root, 'generated/token-manifest.json')
const figmaPath = path.join(root, 'design/figma/variables.contract.json')
const source = JSON.parse(fs.readFileSync(sourcePath, 'utf8'))
const byPath = new Map(source.tokens.map(t => [t.path, t]))

function cssValue(value) {
  const ref = /^\{(.+)\}$/.exec(value)
  if (!ref) return value
  const token = byPath.get(ref[1])
  if (!token) throw new Error(`Unknown token reference: ${value}`)
  return `var(${token.css})`
}

const roles = ['primitive', 'semantic', 'component']
const lines = [':root {']
for (const role of roles) {
  lines.push(`  /* ${role[0].toUpperCase()}${role.slice(1)} tokens */`)
  for (const token of source.tokens.filter(t => t.role === role)) {
    lines.push(`  ${token.css}: ${cssValue(token.value)};`)
  }
  lines.push('')
}
lines.push('}')
lines.push('')
for (const [theme, definition] of Object.entries(source.themes ?? {})) {
  const overrides = definition.overrides ?? {}
  if (!Object.keys(overrides).length) continue
  lines.push(`[data-kbx-theme=\"${theme}\"] {`)
  if (definition.colorScheme) lines.push(`  color-scheme: ${definition.colorScheme};`)
  for (const [tokenPath, value] of Object.entries(overrides)) {
    const token = byPath.get(tokenPath)
    if (!token) throw new Error(`Unknown theme token: ${tokenPath}`)
    lines.push(`  ${token.css}: ${cssValue(value)};`)
  }
  lines.push('}')
  lines.push('')
}
for (const [module, modes] of Object.entries(source.moduleThemes ?? {})) {
  for (const [theme, overrides] of Object.entries(modes ?? {})) {
    if (!Object.keys(overrides ?? {}).length) continue
    const selector = theme === 'light'
      ? `[data-kbx-module=\"${module}\"]`
      : `[data-kbx-theme=\"${theme}\"] [data-kbx-module=\"${module}\"]`
    lines.push(`${selector} {`)
    for (const [tokenPath, value] of Object.entries(overrides)) {
      const token = byPath.get(tokenPath)
      if (!token) throw new Error(`Unknown module theme token: ${tokenPath}`)
      lines.push(`  ${token.css}: ${cssValue(value)};`)
    }
    lines.push('}')
    lines.push('')
  }
}
lines.push('html, body, button, input, select, textarea {')
lines.push('  font-family: var(--kbx-font-family);')
lines.push('}')
lines.push('')
for (const [mode, overrides] of Object.entries(source.modes ?? {})) {
  if (mode === 'compact') continue
  lines.push(`[data-kbx-density="${mode}"] {`)
  for (const [tokenPath, value] of Object.entries(overrides)) {
    const token = byPath.get(tokenPath)
    if (!token) throw new Error(`Unknown mode token: ${tokenPath}`)
    lines.push(`  ${token.css}: ${value};`)
  }
  lines.push('}')
  lines.push('')
}
lines.push(':focus-visible {')
lines.push('  outline: 2px solid var(--kbx-color-focus);')
lines.push('  outline-offset: 2px;')
lines.push('}')
lines.push('')
lines.push('@media (forced-colors: active) {')
lines.push('  :root, [data-kbx-theme="light"], [data-kbx-theme="dark"] {')
lines.push('    --kbx-color-surface: Canvas;')
lines.push('    --kbx-color-surface-muted: Canvas;')
lines.push('    --kbx-color-surface-subtle: Canvas;')
lines.push('    --kbx-color-surface-hover: Highlight;')
lines.push('    --kbx-color-text: CanvasText;')
lines.push('    --kbx-color-text-muted: CanvasText;')
lines.push('    --kbx-color-border: ButtonBorder;')
lines.push('    --kbx-color-border-strong: CanvasText;')
lines.push('    --kbx-color-primary: LinkText;')
lines.push('    --kbx-color-success: CanvasText;')
lines.push('    --kbx-color-warning: CanvasText;')
lines.push('    --kbx-color-danger: CanvasText;')
lines.push('    --kbx-color-focus: Highlight;')
lines.push('    --kbx-color-info-surface: Canvas;')
lines.push('    --kbx-color-success-surface: Canvas;')
lines.push('    --kbx-color-warning-surface: Canvas;')
lines.push('    --kbx-color-danger-surface: Canvas;')
lines.push('    --kbx-color-ai-surface: Canvas;')
lines.push('    --kbx-color-module-accent: Highlight;')
lines.push('    --kbx-color-module-accent-surface: Canvas;')
lines.push('    --kbx-color-module-accent-border: Highlight;')
lines.push('    --kbx-color-workspace: Canvas;')
lines.push('    --kbx-color-shell-chrome: Canvas;')
lines.push('    --kbx-color-navigation-surface: Canvas;')
lines.push('    --kbx-color-section-heading: Canvas;')
lines.push('    --kbx-shadow-shell: none;')
lines.push('    --kbx-shadow-overlay: none;')
lines.push('  }')
lines.push('  :focus-visible { outline-color: Highlight; }')
lines.push('}')
lines.push('')

fs.mkdirSync(path.dirname(manifestPath), { recursive: true })
fs.mkdirSync(path.dirname(figmaPath), { recursive: true })
fs.writeFileSync(cssPath, lines.join('\n'))
fs.writeFileSync(manifestPath, JSON.stringify({version: source.version, tokens: source.tokens, modes: source.modes, themes: source.themes, moduleThemes: source.moduleThemes}, null, 2) + '\n')

const collections = {
  'KBX Primitive': source.tokens.filter(t => t.role === 'primitive').map(t => ({name:t.path, type:t.type, value:t.value, description:t.description ?? ''})),
  'KBX Semantic': source.tokens.filter(t => t.role === 'semantic').map(t => ({name:t.path, type:t.type, value:t.value, description:t.description ?? ''})),
  'KBX Component': source.tokens.filter(t => t.role === 'component').map(t => ({name:t.path, type:t.type, value:t.value, description:t.description ?? '', modes:Object.fromEntries(Object.entries(source.modes ?? {}).filter(([,o]) => t.path in o).map(([mode,o]) => [mode,o[t.path]]))}))
}
fs.writeFileSync(figmaPath, JSON.stringify({schemaVersion:'1.0', tokenVersion:source.version, collections, themes:source.themes ?? {}, moduleThemes:source.moduleThemes ?? {}}, null, 2) + '\n')
console.log(`Generated ${source.tokens.length} design tokens -> CSS / token manifest / Figma variable contract`)