// `rnx get screens` — print the current navigation stack + shell state +
// any presented modal + keyboard. answers "what screen am I on?" without
// having to dump the whole tree or scrape screen-specific testIDs.
//
// sources:
//   - navigation-runtime snapshot (test bridge) for screen stack + phase
//   - mainShell.getState() for active app + switcher / launch progress
//   - __sootsimKeyboard.getLayout() for keyboard visibility + spec

import { inspectScreens } from './core'
import type { WsBridge } from '../../ws-bridge'

export async function runScreensSubcommand(
  bridge: WsBridge,
  opts: { json?: boolean } = {},
): Promise<void> {
  const { nav, route, keyboard, shell } = await inspectScreens(bridge)

  if (opts.json) {
    console.log(JSON.stringify({ shell: shell ?? null, nav, route, keyboard }, null, 2))
    return
  }

  const lines: string[] = []

  // shell — what app, what switcher state
  if (shell) {
    const activeApp = shell.activeApp ?? shell.state ?? '<none>'
    const switcher = shell.showSwitcher ? ' (app switcher open)' : ''
    const launchProgress =
      typeof shell.launchProgress === 'number' && shell.launchProgress < 0.98
        ? ` launching (${Math.round(shell.launchProgress * 100)}%)`
        : ''
    lines.push(`shell:    ${activeApp}${switcher}${launchProgress}`)
  } else {
    lines.push(`shell:    <unavailable>`)
  }

  // navigation stack
  if (nav) {
    const phase =
      nav.transitionPhase !== 'idle'
        ? ` (${nav.transitionPhase}, ${nav.activeTransitionCount} active)`
        : ''
    lines.push(`nav:      phase=${nav.transitionPhase}${phase}`)
    if (nav.screens.length === 0) {
      lines.push(`  <no registered screens — app may not use react-native-screens>`)
    } else {
      for (const s of nav.screens) {
        const marker = s.isActive ? '▶' : ' '
        const route = s.routeName ? ` ${s.routeName}` : ''
        const header = s.headerHeight > 0 ? ` header=${s.headerHeight}` : ''
        const lt =
          s.largeTitleState && s.largeTitleState !== 'expanded'
            ? ` large-title=${s.largeTitleState}`
            : ''
        lines.push(`  ${marker} #${s.id}${route}${header}${lt}`)
      }
    }
  } else {
    lines.push(`nav:      <runtime not available>`)
  }
  lines.push(`route:    ${route?.currentPath ?? '<unavailable>'}`)
  if (route?.coveringPath) {
    lines.push(`covered:  a presented screen (${route.coveringPath}) is above this route`)
  }

  // keyboard
  if (keyboard && keyboard.visible) {
    const type = keyboard.spec?.keyboardType ?? 'default'
    const ret = keyboard.spec?.returnKeyType ?? 'default'
    lines.push(`keyboard: visible (${type}, return=${ret}, mode=${keyboard.mode ?? '?'})`)
  } else {
    lines.push(`keyboard: hidden`)
  }

  console.log(lines.join('\n'))
}