opencode/packages/app/src/pages/session/helpers.ts

import { batch, createEffect, on, onCleanup, onMount, type Accessor } from "solid-js"
import { createStore } from "solid-js/store"

export const focusTerminalById = (id: string) => {
  const wrapper = document.getElementById(`terminal-wrapper-${id}`)
  const terminal = wrapper?.querySelector('[data-component="terminal"]')
  if (!(terminal instanceof HTMLElement)) return false

  const textarea = terminal.querySelector("textarea")
  if (textarea instanceof HTMLTextAreaElement) {
    textarea.focus()
    return true
  }

  terminal.focus()
  terminal.dispatchEvent(
    typeof PointerEvent === "function"
      ? new PointerEvent("pointerdown", { bubbles: true, cancelable: true })
      : new MouseEvent("pointerdown", { bubbles: true, cancelable: true }),
  )
  return true
}

export const createOpenReviewFile = (input: {
  showAllFiles: () => void
  tabForPath: (path: string) => string
  openTab: (tab: string) => void
  setActive: (tab: string) => void
  loadFile: (path: string) => any | Promise<void>
}) => {
  return (path: string) => {
    batch(() => {
      input.showAllFiles()
      const maybePromise = input.loadFile(path)
      const open = () => {
        const tab = input.tabForPath(path)
        input.openTab(tab)
        input.setActive(tab)
      }
      if (maybePromise instanceof Promise) maybePromise.then(open)
      else open()
    })
  }
}

export const createOpenSessionFileTab = (input: {
  normalizeTab: (tab: string) => string
  openTab: (tab: string) => void
  pathFromTab: (tab: string) => string | undefined
  loadFile: (path: string) => void
  openReviewPanel: () => void
  setActive: (tab: string) => void
}) => {
  return (value: string) => {
    const next = input.normalizeTab(value)
    input.openTab(next)

    const path = input.pathFromTab(next)
    if (!path) return

    input.loadFile(path)
    input.openReviewPanel()
    input.setActive(next)
  }
}

export const getTabReorderIndex = (tabs: readonly string[], from: string, to: string) => {
  const fromIndex = tabs.indexOf(from)
  const toIndex = tabs.indexOf(to)
  if (fromIndex === -1 || toIndex === -1 || fromIndex === toIndex) return undefined
  return toIndex
}

export const createSizing = () => {
  const [state, setState] = createStore({ active: false })
  let t: number | undefined

  const stop = () => {
    if (t !== undefined) {
      clearTimeout(t)
      t = undefined
    }
    setState("active", false)
  }

  const start = () => {
    if (t !== undefined) {
      clearTimeout(t)
      t = undefined
    }
    setState("active", true)
  }

  onMount(() => {
    window.addEventListener("pointerup", stop)
    window.addEventListener("pointercancel", stop)
    window.addEventListener("blur", stop)
    onCleanup(() => {
      window.removeEventListener("pointerup", stop)
      window.removeEventListener("pointercancel", stop)
      window.removeEventListener("blur", stop)
    })
  })

  onCleanup(() => {
    if (t !== undefined) clearTimeout(t)
  })

  return {
    active: () => state.active,
    start,
    touch() {
      start()
      t = window.setTimeout(stop, 120)
    },
  }
}

export type Sizing = ReturnType<typeof createSizing>

export const createPresence = (open: Accessor<boolean>, wait = 200) => {
  const [state, setState] = createStore({
    show: open(),
    open: open(),
  })
  let frame: number | undefined
  let t: number | undefined

  const clear = () => {
    if (frame !== undefined) {
      cancelAnimationFrame(frame)
      frame = undefined
    }
    if (t !== undefined) {
      clearTimeout(t)
      t = undefined
    }
  }

  createEffect(
    on(open, (next) => {
      clear()

      if (next) {
        if (state.show) {
          setState("open", true)
          return
        }

        setState({ show: true, open: false })
        frame = requestAnimationFrame(() => {
          frame = undefined
          setState("open", true)
        })
        return
      }

      if (!state.show) return
      setState("open", false)
      t = window.setTimeout(() => {
        t = undefined
        setState("show", false)
      }, wait)
    }),
  )

  onCleanup(clear)

  return {
    show: () => state.show,
    open: () => state.open,
  }
}