import { createEffect, createMemo, Show } from "solid-js"
import { IconButton } from "@opencode-ai/ui/icon-button"
import { TooltipKeybind } from "@opencode-ai/ui/tooltip"
import { useTheme } from "@opencode-ai/ui/theme"

import { useLayout } from "@/context/layout"
import { usePlatform } from "@/context/platform"
import { useCommand } from "@/context/command"

export function Titlebar() {
  const layout = useLayout()
  const platform = usePlatform()
  const command = useCommand()
  const theme = useTheme()

  const mac = createMemo(() => platform.platform === "desktop" && platform.os === "macos")
  const reserve = createMemo(
    () => platform.platform === "desktop" && (platform.os === "windows" || platform.os === "linux"),
  )
  const web = createMemo(() => platform.platform === "web")

  const getWin = () => {
    if (platform.platform !== "desktop") return

    const tauri = (
      window as unknown as {
        __TAURI__?: { window?: { getCurrentWindow?: () => { startDragging?: () => Promise<void> } } }
      }
    ).__TAURI__
    if (!tauri?.window?.getCurrentWindow) return

    return tauri.window.getCurrentWindow()
  }

  createEffect(() => {
    if (platform.platform !== "desktop") return

    const scheme = theme.colorScheme()
    const value = scheme === "system" ? null : scheme

    const tauri = (window as unknown as { __TAURI__?: { webviewWindow?: { getCurrentWebviewWindow?: () => unknown } } })
      .__TAURI__
    const get = tauri?.webviewWindow?.getCurrentWebviewWindow
    if (!get) return

    const win = get() as { setTheme?: (theme?: "light" | "dark" | null) => Promise<void> }
    if (!win.setTheme) return

    void win.setTheme(value).catch(() => undefined)
  })

  const interactive = (target: EventTarget | null) => {
    if (!(target instanceof Element)) return false

    const selector =
      "button, a, input, textarea, select, option, [role='button'], [role='menuitem'], [contenteditable='true'], [contenteditable='']"

    return !!target.closest(selector)
  }

  const drag = (e: MouseEvent) => {
    if (platform.platform !== "desktop") return
    if (e.buttons !== 1) return
    if (interactive(e.target)) return

    const win = getWin()
    if (!win?.startDragging) return

    e.preventDefault()
    void win.startDragging().catch(() => undefined)
  }

  return (
    <header class="h-10 shrink-0 bg-background-base flex items-center relative">
      <div
        classList={{
          "flex items-center w-full min-w-0 pr-2": true,
          "pl-2": !mac(),
        }}
        onMouseDown={drag}
      >
        <Show when={mac()}>
          <div class="w-[72px] h-full shrink-0" data-tauri-drag-region />
        </Show>
        <IconButton
          icon="menu"
          variant="ghost"
          class="xl:hidden size-8 rounded-md"
          onClick={layout.mobileSidebar.toggle}
        />
        <TooltipKeybind
          class={web() ? "hidden xl:flex shrink-0 ml-14" : "hidden xl:flex shrink-0"}
          placement="bottom"
          title="Toggle sidebar"
          keybind={command.keybind("sidebar.toggle")}
        >
          <IconButton
            icon={layout.sidebar.opened() ? "layout-left" : "layout-right"}
            variant="ghost"
            class="size-8 rounded-md"
            onClick={layout.sidebar.toggle}
          />
        </TooltipKeybind>
        <div id="opencode-titlebar-left" class="flex items-center gap-3 min-w-0 px-2" />
        <div class="flex-1 h-full" data-tauri-drag-region />
        <div id="opencode-titlebar-right" class="flex items-center gap-3 shrink-0" />
        <Show when={reserve()}>
          <div class="w-[120px] h-full shrink-0" data-tauri-drag-region />
        </Show>
      </div>
      <div class="absolute inset-0 flex items-center justify-center pointer-events-none">
        <div id="opencode-titlebar-center" class="pointer-events-auto" />
      </div>
    </header>
  )
}
