import { memo, useCallback, useMemo, useRef, useState } from 'react'
import { useHotkeys } from 'react-hotkeys-hook'

import { useAppState } from '@src/AppState'
import { ActionButton } from '@src/components/ActionButton'
import { ActionButtonDropdown } from '@src/components/ActionButtonDropdown'
import { CustomIcon } from '@src/components/CustomIcon'
import Tooltip from '@src/components/Tooltip'
import { useModelingContext } from '@src/hooks/useModelingContext'
import { useNetworkContext } from '@src/hooks/useNetworkContext'
import { NetworkHealthState } from '@src/hooks/useNetworkStatus'
import { useKclContext } from '@src/lang/KclProvider'
import { isCursorInFunctionDefinition } from '@src/lang/queryAst'
import { EngineConnectionStateType } from '@src/lang/std/engineConnection'
import { isCursorInSketchCommandRange } from '@src/lang/util'
import { isDesktop } from '@src/lib/isDesktop'
import { openExternalBrowserIfDesktop } from '@src/lib/openWindow'
import { editorManager, kclManager } from '@src/lib/singletons'
import type {
  ToolbarDropdown,
  ToolbarItem,
  ToolbarItemCallbackProps,
  ToolbarItemResolved,
  ToolbarItemResolvedDropdown,
  ToolbarModeName,
} from '@src/lib/toolbar'
import { isToolbarItemResolvedDropdown, toolbarConfig } from '@src/lib/toolbar'
import { commandBarActor } from '@src/lib/singletons'
import { filterEscHotkey } from '@src/lib/hotkeyWrapper'

export function Toolbar({
  className = '',
  ...props
}: React.HTMLAttributes<HTMLElement>) {
  const { state, send, context } = useModelingContext()
  const iconClassName =
    'group-disabled:text-chalkboard-50 !text-inherit dark:group-enabled:group-hover:!text-inherit'
  const bgClassName = '!bg-transparent'
  const buttonBgClassName =
    'bg-chalkboard-transparent dark:bg-transparent disabled:bg-transparent dark:disabled:bg-transparent enabled:hover:bg-chalkboard-10 dark:enabled:hover:bg-chalkboard-100 pressed:!bg-primary pressed:enabled:hover:!text-chalkboard-10'
  const buttonBorderClassName = '!border-transparent'

  const sketchPathId = useMemo(() => {
    if (
      isCursorInFunctionDefinition(
        kclManager.ast,
        context.selectionRanges.graphSelections[0]
      )
    )
      return false
    return isCursorInSketchCommandRange(
      kclManager.artifactGraph,
      context.selectionRanges
    )
  }, [kclManager.artifactGraph, context.selectionRanges])

  const toolbarButtonsRef = useRef<HTMLUListElement>(null)
  const { overallState, immediateState } = useNetworkContext()
  const { isExecuting } = useKclContext()
  const { isStreamReady } = useAppState()
  const [showRichContent, setShowRichContent] = useState(false)

  const disableAllButtons =
    (overallState !== NetworkHealthState.Ok &&
      overallState !== NetworkHealthState.Weak) ||
    isExecuting ||
    immediateState.type !== EngineConnectionStateType.ConnectionEstablished ||
    !isStreamReady

  const currentMode =
    (Object.entries(toolbarConfig).find(([_, mode]) =>
      mode.check(state)
    )?.[0] as ToolbarModeName) || 'modeling'

  /** These are the props that will be passed to the callbacks in the toolbar config
   * They are memoized to prevent unnecessary re-renders,
   * but they still get a lot of churn from the state machine
   * so I think there's a lot of room for improvement here
   */
  const configCallbackProps: ToolbarItemCallbackProps = useMemo(
    () => ({
      modelingState: state,
      modelingSend: send,
      sketchPathId,
      editorHasFocus: editorManager.editorView?.hasFocus,
    }),
    [
      state,
      send,
      commandBarActor.send,
      sketchPathId,
      editorManager.editorView?.hasFocus,
    ]
  )

  const tooltipContentClassName = !showRichContent
    ? ''
    : '!text-left text-wrap !text-xs !p-0 !pb-2 flex !max-w-none !w-72 flex-col items-stretch'
  const richContentTimeout = useRef<number | null>(null)
  const richContentClearTimeout = useRef<number | null>(null)
  // On mouse enter, show rich content after a 1s delay
  const handleMouseEnter = useCallback(() => {
    // Cancel the clear timeout if it's already set
    if (richContentClearTimeout.current) {
      clearTimeout(richContentClearTimeout.current)
    }
    // Start our own timeout to show the rich content
    richContentTimeout.current = window.setTimeout(() => {
      setShowRichContent(true)
      if (richContentClearTimeout.current) {
        clearTimeout(richContentClearTimeout.current)
      }
    }, 1000)
  }, [setShowRichContent])
  // On mouse leave, clear the timeout and hide rich content
  const handleMouseLeave = useCallback(() => {
    // Clear the timeout to show rich content
    if (richContentTimeout.current) {
      clearTimeout(richContentTimeout.current)
    }
    // Start a timeout to hide the rich content
    richContentClearTimeout.current = window.setTimeout(() => {
      setShowRichContent(false)
      if (richContentClearTimeout.current) {
        clearTimeout(richContentClearTimeout.current)
      }
    }, 500)
  }, [setShowRichContent])

  /**
   * Resolve all the callbacks and values for the current mode,
   * so we don't need to worry about the other modes
   */
  const currentModeItems: (
    | ToolbarItemResolved
    | ToolbarItemResolvedDropdown
    | 'break'
  )[] = useMemo(() => {
    return toolbarConfig[currentMode].items.map((maybeIconConfig) => {
      if (maybeIconConfig === 'break') {
        return 'break'
      } else if (isToolbarDropdown(maybeIconConfig)) {
        return {
          id: maybeIconConfig.id,
          array: maybeIconConfig.array.map((item) => resolveItemConfig(item)),
        }
      } else {
        return resolveItemConfig(maybeIconConfig)
      }
    })

    function resolveItemConfig(
      maybeIconConfig: ToolbarItem
    ): ToolbarItemResolved {
      const isConfiguredAvailable = ['available', 'experimental'].includes(
        maybeIconConfig.status
      )
      const isDisabled =
        disableAllButtons ||
        !isConfiguredAvailable ||
        maybeIconConfig.disabled?.(state) === true ||
        kclManager.hasErrors()

      return {
        ...maybeIconConfig,
        title:
          typeof maybeIconConfig.title === 'string'
            ? maybeIconConfig.title
            : maybeIconConfig.title(configCallbackProps),
        description: maybeIconConfig.description,
        links: maybeIconConfig.links || [],
        isActive: maybeIconConfig.isActive?.(state),
        hotkey:
          typeof maybeIconConfig.hotkey === 'string'
            ? maybeIconConfig.hotkey
            : maybeIconConfig.hotkey?.(state),
        disabled: isDisabled,
        disabledReason:
          typeof maybeIconConfig.disabledReason === 'function'
            ? maybeIconConfig.disabledReason(state)
            : maybeIconConfig.disabledReason,
        disableHotkey: maybeIconConfig.disableHotkey?.(state),
        status: maybeIconConfig.status,
      }
    }
  }, [currentMode, disableAllButtons, configCallbackProps])

  // To remember the last selected item in an ActionButtonDropdown
  const [lastSelectedMultiActionItem, _] = useState(
    new Map<
      number /* index in currentModeItems */,
      number /* index in maybeIconConfig */
    >()
  )

  return (
    <menu
      data-current-mode={currentMode}
      data-onboarding-id="toolbar"
      className="max-w-full whitespace-nowrap rounded-b px-2 py-1 bg-chalkboard-10 dark:bg-chalkboard-90 relative border border-chalkboard-30 dark:border-chalkboard-80 border-t-0 shadow-sm"
    >
      <ul
        {...props}
        ref={toolbarButtonsRef}
        className={
          'has-[[aria-expanded=true]]:!pointer-events-none m-0 py-1 rounded-l-sm flex gap-1.5 items-center ' +
          className
        }
      >
        {/* A menu item will either be a vertical line break, a button with a dropdown, or a single button */}
        {currentModeItems.map((maybeIconConfig, i) => {
          // Vertical Line Break
          if (maybeIconConfig === 'break') {
            return (
              <div
                key={'break-' + i}
                className="h-5 w-[1px] block bg-chalkboard-30 dark:bg-chalkboard-80"
              />
            )
          } else if (isToolbarItemResolvedDropdown(maybeIconConfig)) {
            // A button with a dropdown
            const selectedIcon =
              maybeIconConfig.array.find((c) => c.isActive) ||
              maybeIconConfig.array[lastSelectedMultiActionItem.get(i) ?? 0]

            // Save the last selected item in the dropdown
            lastSelectedMultiActionItem.set(
              i,
              maybeIconConfig.array.indexOf(selectedIcon)
            )
            return (
              <ActionButtonDropdown
                Element="button"
                key={selectedIcon.id}
                data-testid={selectedIcon.id + '-dropdown'}
                data-onboarding-id={selectedIcon.id + '-dropdown'}
                id={selectedIcon.id + '-dropdown'}
                name={maybeIconConfig.id}
                className={
                  (maybeIconConfig.array[0].alwaysDark
                    ? 'dark bg-chalkboard-90 '
                    : '!bg-transparent ') +
                  'group/wrapper ' +
                  buttonBorderClassName +
                  ' relative group !gap-0'
                }
                splitMenuItems={maybeIconConfig.array.map((itemConfig) => ({
                  id: itemConfig.id,
                  label: itemConfig.title,
                  hotkey: itemConfig.hotkey,
                  onClick: () => itemConfig.onClick(configCallbackProps),
                  disabled:
                    disableAllButtons ||
                    !['available', 'experimental'].includes(
                      itemConfig.status
                    ) ||
                    itemConfig.disabled === true ||
                    itemConfig.disableHotkey === true,
                  status: itemConfig.status,
                }))}
              >
                <div
                  className="contents"
                  // Mouse events do not fire on disabled buttons
                  onMouseEnter={handleMouseEnter}
                  onMouseLeave={handleMouseLeave}
                >
                  <ActionButton
                    Element="button"
                    id={selectedIcon.id}
                    data-testid={selectedIcon.id}
                    data-onboarding-id={selectedIcon.id}
                    iconStart={{
                      icon: selectedIcon.icon,
                      iconColor: selectedIcon.iconColor,
                      className: iconClassName,
                      bgClassName: bgClassName,
                    }}
                    className={
                      '!border-transparent !px-0 pressed:!text-chalkboard-10 pressed:enabled:hovered:!text-chalkboard-10 ' +
                      buttonBgClassName
                    }
                    aria-pressed={selectedIcon.isActive}
                    disabled={
                      disableAllButtons ||
                      !['available', 'experimental'].includes(
                        selectedIcon.status
                      ) ||
                      selectedIcon.disabled
                    }
                    name={selectedIcon.title}
                    // aria-description is still in ARIA 1.3 draft.
                    // eslint-disable-next-line jsx-a11y/aria-props
                    aria-description={selectedIcon.description}
                    onClick={() => selectedIcon.onClick(configCallbackProps)}
                  >
                    <span className={!selectedIcon.showTitle ? 'sr-only' : ''}>
                      {selectedIcon.title}
                    </span>
                    <ToolbarItemTooltip
                      itemConfig={selectedIcon}
                      configCallbackProps={configCallbackProps}
                      wrapperClassName="ui-open:!hidden"
                      contentClassName={tooltipContentClassName}
                    >
                      {showRichContent ? (
                        <ToolbarItemTooltipRichContent
                          itemConfig={selectedIcon}
                        />
                      ) : (
                        <ToolbarItemTooltipShortContent
                          status={selectedIcon.status}
                          title={selectedIcon.title}
                          hotkey={selectedIcon.hotkey}
                        />
                      )}
                    </ToolbarItemTooltip>
                  </ActionButton>
                </div>
              </ActionButtonDropdown>
            )
          }
          const itemConfig = maybeIconConfig

          // A single button
          return (
            <div
              className="relative"
              key={itemConfig.id}
              // Mouse events do not fire on disabled buttons
              onMouseEnter={handleMouseEnter}
              onMouseLeave={handleMouseLeave}
            >
              <ActionButton
                Element="button"
                key={itemConfig.id}
                id={itemConfig.id}
                data-testid={itemConfig.id}
                data-onboarding-id={itemConfig.id}
                iconStart={{
                  icon: itemConfig.icon,
                  iconColor: itemConfig.iconColor,
                  className: iconClassName,
                  bgClassName: bgClassName,
                }}
                className={
                  'pressed:!text-chalkboard-10 pressed:enabled:hovered:!text-chalkboard-10 ' +
                  buttonBorderClassName +
                  ' ' +
                  buttonBgClassName +
                  (!itemConfig.showTitle ? ' !px-0' : '')
                }
                name={itemConfig.title}
                // aria-description is still in ARIA 1.3 draft.
                // eslint-disable-next-line jsx-a11y/aria-props
                aria-description={itemConfig.description}
                aria-pressed={itemConfig.isActive}
                disabled={
                  disableAllButtons ||
                  !['available', 'experimental'].includes(itemConfig.status) ||
                  itemConfig.disabled
                }
                onClick={() => itemConfig.onClick(configCallbackProps)}
              >
                <span className={!itemConfig.showTitle ? 'sr-only' : ''}>
                  {itemConfig.title}
                </span>
              </ActionButton>
              <ToolbarItemTooltip
                itemConfig={itemConfig}
                configCallbackProps={configCallbackProps}
                contentClassName={tooltipContentClassName}
              >
                {showRichContent ? (
                  <ToolbarItemTooltipRichContent itemConfig={itemConfig} />
                ) : (
                  <ToolbarItemTooltipShortContent
                    status={itemConfig.status}
                    title={itemConfig.title}
                    hotkey={itemConfig.hotkey}
                  />
                )}
              </ToolbarItemTooltip>
            </div>
          )
        })}
      </ul>
      {state.matches('Sketch no face') && (
        <div className="absolute top-full left-1/2 -translate-x-1/2 mt-2 py-1 px-2 bg-chalkboard-10 dark:bg-chalkboard-90 border border-chalkboard-20 dark:border-chalkboard-80 rounded shadow-lg">
          <p className="text-xs">Select a plane or face to start sketching</p>
        </div>
      )}
    </menu>
  )
}

interface ToolbarItemContentsProps extends React.PropsWithChildren {
  itemConfig: ToolbarItemResolved
  configCallbackProps: ToolbarItemCallbackProps
  wrapperClassName?: string
  contentClassName?: string
}
/**
 * The single button and dropdown button share content, so we extract it here
 * It contains a tooltip with the title, description, and links
 * and a hotkey listener
 */
const ToolbarItemTooltip = memo(function ToolbarItemContents({
  itemConfig,
  configCallbackProps,
  wrapperClassName = '',
  contentClassName = '',
  children,
}: ToolbarItemContentsProps) {
  /**
   * GOTCHA: `useHotkeys` can only register one hotkey listener per component.
   * TODO: make a global hotkey registration system. make them editable.
   */
  useHotkeys(
    itemConfig.hotkey || '',
    () => {
      itemConfig.onClick(configCallbackProps)
    },
    {
      enabled:
        ['available', 'experimental'].includes(itemConfig.status) &&
        !!itemConfig.hotkey &&
        !itemConfig.disabled &&
        !itemConfig.disableHotkey,
    }
  )

  return (
    <Tooltip
      inert={false}
      wrapperStyle={
        isDesktop()
          ? // Without this, the tooltip disappears before being able to click on anything in it
            ({ WebkitAppRegion: 'no-drag' } as React.CSSProperties)
          : {}
      }
      hoverOnly
      position="bottom"
      wrapperClassName={'!p-4 !pointer-events-auto ' + wrapperClassName}
      contentClassName={contentClassName}
    >
      {children}
      {kclManager.hasErrors() && (
        <p className="text-xs p-1 text-chalkboard-70 dark:text-chalkboard-40">
          <CustomIcon
            name="exclamationMark"
            className="w-4 h-4 inline-block mr-1 text-destroy-80 bg-destroy-10"
          />
          Fix KCL errors to enable tools
        </p>
      )}
    </Tooltip>
  )
})

const ToolbarItemTooltipShortContent = ({
  status,
  title,
  hotkey,
}: {
  status: string
  title: string
  hotkey?: string | string[]
}) => (
  <div
    className={`text-sm flex flex-col ${
      !['available', 'experimental'].includes(status)
        ? 'text-chalkboard-70 dark:text-chalkboard-40'
        : ''
    }`}
  >
    {status === 'experimental' && (
      <div className="text-xs flex justify-center item-center gap-1 pb-1 border-b border-chalkboard-50">
        <CustomIcon name="beaker" className="w-4 h-4" />
        <span>Experimental</span>
      </div>
    )}
    <div className={`flex gap-4 ${status === 'experimental' ? 'pt-1' : 'p-0'}`}>
      {title}
      {hotkey && (
        <kbd className="inline-block ml-2 flex-none hotkey">
          {filterEscHotkey(hotkey)}
        </kbd>
      )}
    </div>
  </div>
)

const ToolbarItemTooltipRichContent = ({
  itemConfig,
}: {
  itemConfig: ToolbarItemResolved
}) => {
  const shouldBeEnabled = ['available', 'experimental'].includes(
    itemConfig.status
  )
  const { state } = useModelingContext()
  return (
    <>
      {itemConfig.status === 'experimental' && (
        <div className="text-xs flex items-center justify-center self-stretch gap-1 p-1 border-b">
          <CustomIcon name="beaker" className="w-4 h-4" />
          <span className="block">Experimental</span>
        </div>
      )}
      <div className="rounded-top flex items-center gap-2 pt-3 pb-2 px-2 bg-chalkboard-20/50 dark:bg-chalkboard-80/50">
        {itemConfig.icon && (
          <CustomIcon
            className="w-5 h-5"
            style={{ color: itemConfig.iconColor }}
            name={itemConfig.icon}
          />
        )}
        <div
          className={`text-sm flex-1 flex flex-col gap-1 ${
            !shouldBeEnabled ? 'text-chalkboard-70 dark:text-chalkboard-40' : ''
          }`}
        >
          {itemConfig.title}
        </div>
        {shouldBeEnabled && itemConfig.hotkey ? (
          <kbd className="flex-none hotkey">
            {filterEscHotkey(itemConfig.hotkey)}
          </kbd>
        ) : itemConfig.status === 'kcl-only' ? (
          <>
            <span className="text-wrap font-sans flex-0 text-chalkboard-70 dark:text-chalkboard-40">
              KCL code only
            </span>
            <CustomIcon
              name="code"
              className="w-5 h-5 text-chalkboard-70 dark:text-chalkboard-40"
            />
          </>
        ) : (
          itemConfig.status === 'unavailable' && (
            <>
              <span className="text-wrap font-sans flex-0 text-chalkboard-70 dark:text-chalkboard-40">
                In development
              </span>
              <CustomIcon
                name="lockClosed"
                className="w-5 h-5 text-chalkboard-70 dark:text-chalkboard-40"
              />
            </>
          )
        )}
      </div>
      <p className="px-2 my-2 text-ch font-sans">{itemConfig.description}</p>
      {/* Add disabled reason if item is disabled */}
      {itemConfig.disabled && itemConfig.disabledReason && (
        <>
          <hr className="border-chalkboard-20 dark:border-chalkboard-80" />
          <p className="px-2 my-2 text-ch font-sans text-chalkboard-70 dark:text-chalkboard-40">
            {typeof itemConfig.disabledReason === 'function'
              ? itemConfig.disabledReason(state)
              : itemConfig.disabledReason}
          </p>
        </>
      )}
      {itemConfig.links.length > 0 && (
        <>
          <hr className="border-chalkboard-20 dark:border-chalkboard-80" />
          <ul className="p-0 px-1 m-0 flex flex-col">
            {itemConfig.links.map((link) => (
              <li key={link.label} className="contents">
                <a
                  href={link.url}
                  onClick={openExternalBrowserIfDesktop(link.url)}
                  target="_blank"
                  rel="noreferrer"
                  className="flex items-center rounded-sm p-1 no-underline text-inherit hover:bg-primary/10 hover:text-primary dark:hover:bg-chalkboard-70 dark:hover:text-inherit"
                >
                  <span className="flex-1">Open {link.label}</span>
                  <CustomIcon name="link" className="w-4 h-4" />
                </a>
              </li>
            ))}
          </ul>
        </>
      )}
    </>
  )
}

function isToolbarDropdown(
  item: ToolbarItem | ToolbarDropdown
): item is ToolbarDropdown {
  return 'array' in item
}