import PropTypes from 'prop-types'
import {
  useCallback,
  useEffect,
  useLayoutEffect,
  useRef,
  useState,
  memo
} from 'react'
import { Button, Flex, Popover } from 'antd'
import DashboardTabPreview from './DashboardTabPreview'
import ElipsisText from './ElipsisText'
import classNames from 'classnames'
import ScrollBox from './ScrollBox'
import PlusIcon from '../../Icons/PlusIcon'
import XMarkIcon from '../../Icons/XMarkIcon'
import HomeIcon from '../../Icons/HomeIcon'
import { getModelByName } from '../../../database/ObjectModels'
import { getSidebarIconComponent } from '../../Icons/sidebarIconMap'
import {
  useNavigationTabs,
  useTabPreview
} from '../context/NavigationTabsContext'
import { getDesktopWindowId } from '../../../electrobun-bridge.js'
import { hasExternalTabDrag, writeTabDragData } from './tabDrag'

const DashboardTabChrome = () => (
  <>
    <span className='dashboard-tab-item-outline-container' aria-hidden='true'>
      <span className='dashboard-tab-item-outline' aria-hidden='true' />
    </span>
    <span
      className='dashboard-tab-item-corner dashboard-tab-item-corner-left'
      aria-hidden='true'
    >
      <span className='dashboard-tab-item-corner-fill' />
      <span className='dashboard-tab-item-corner-inner' />
    </span>
    <span
      className='dashboard-tab-item-corner dashboard-tab-item-corner-right'
      aria-hidden='true'
    >
      <span className='dashboard-tab-item-corner-fill' />
      <span className='dashboard-tab-item-corner-inner' />
    </span>
  </>
)

const DashboardTabLabel = ({ tab, onClose }) => (
  <Flex align='center' gap={6} className='dashboard-tabs-label'>
    <ElipsisText>{tab.title || 'Farm Control'}</ElipsisText>
    <span
      className='dashboard-tabs-close'
      role='button'
      tabIndex={-1}
      onClick={(event) => {
        event.preventDefault()
        event.stopPropagation()
        onClose?.(tab.id)
      }}
      onMouseDown={(event) => event.stopPropagation()}
    >
      <XMarkIcon style={{ fontSize: 10 }} />
    </span>
  </Flex>
)

DashboardTabLabel.propTypes = {
  tab: PropTypes.shape({
    id: PropTypes.string.isRequired,
    title: PropTypes.string
  }).isRequired,
  onClose: PropTypes.func
}

const DashboardTabItem = memo(function DashboardTabItem({
  htmlId = undefined,
  tab,
  tabIndex,
  isSelected,
  isDragging,
  dropPosition,
  onDragStart,
  onDragEnd,
  onClick,
  onKeyDown,
  onDragOver,
  onDrop,
  onClose,
  captureTabPreview
}) {
  const {
    src: previewSrc,
    theme: previewTheme,
    capturing: previewCapturing
  } = useTabPreview(tab.id)
  const [previewOpen, setPreviewOpen] = useState(false)
  const previewTargetRef = useRef(null)
  const model = tab.modelName ? getModelByName(tab.modelName) : null
  const SidebarIcon = getSidebarIconComponent(tab.iconKey)
  const Icon = model?.icon || SidebarIcon || HomeIcon

  const handlePreviewOpenChange = useCallback(
    (nextOpen) => {
      if (isSelected || isDragging) {
        setPreviewOpen(false)
        return
      }
      setPreviewOpen(nextOpen)
      if (nextOpen) {
        void captureTabPreview(tab.id)
      }
    },
    [captureTabPreview, isDragging, isSelected, tab.id]
  )

  useEffect(() => {
    if (isSelected || isDragging) {
      setPreviewOpen(false)
    }
  }, [isDragging, isSelected])

  const tabButton = (
    <button
      ref={previewTargetRef}
      type='button'
      role='tab'
      aria-selected={isSelected}
      tabIndex={isSelected ? 0 : -1}
      className={classNames(
        'dashboard-tab-item',
        'electrobun-webkit-app-region-no-drag',
        {
          'dashboard-tab-item-active': isSelected,
          'dashboard-tab-item-dragging': isDragging,
          'dashboard-tab-item-drop-before': dropPosition === 'before',
          'dashboard-tab-item-drop-after': dropPosition === 'after'
        }
      )}
      draggable
      onDragStart={(event) => onDragStart(event, tab.id)}
      onDragEnd={onDragEnd}
      id={htmlId}
      onClick={() => onClick(tab.id)}
      onKeyDown={(event) => onKeyDown(event, tabIndex)}
      onDragOver={(event) => onDragOver(event, tab)}
      onDrop={(event) => onDrop(event, tab)}
    >
      <DashboardTabChrome />
      <span className='dashboard-tab-item-body'>
        <span className='dashboard-tab-item-icon'>
          <Icon style={{ fontSize: 14 }} color='secondary' />
        </span>
        <DashboardTabLabel tab={tab} onClose={onClose} />
      </span>
    </button>
  )

  if (isSelected) {
    return tabButton
  }

  return (
    <Popover
      trigger='hover'
      placement='bottom'
      arrow={false}
      mouseEnterDelay={1}
      mouseLeaveDelay={0}
      destroyOnHidden
      open={isDragging ? false : previewOpen}
      onOpenChange={handlePreviewOpenChange}
      content={
        <DashboardTabPreview
          src={previewSrc}
          srcTheme={previewTheme}
          loading={previewCapturing}
        />
      }
      classNames={{ root: 'dashboard-tab-preview-popover' }}
      styles={{ body: { padding: 0, overflow: 'hidden' } }}
    >
      {tabButton}
    </Popover>
  )
})

DashboardTabItem.displayName = 'DashboardTabItem'

DashboardTabItem.propTypes = {
  htmlId: PropTypes.string,
  tab: PropTypes.shape({
    id: PropTypes.string.isRequired,
    title: PropTypes.string,
    modelName: PropTypes.string,
    iconKey: PropTypes.string
  }).isRequired,
  tabIndex: PropTypes.number.isRequired,
  isSelected: PropTypes.bool,
  isDragging: PropTypes.bool,
  dropPosition: PropTypes.oneOf(['before', 'after']),
  onDragStart: PropTypes.func.isRequired,
  onDragEnd: PropTypes.func.isRequired,
  onClick: PropTypes.func.isRequired,
  onKeyDown: PropTypes.func.isRequired,
  onDragOver: PropTypes.func.isRequired,
  onDrop: PropTypes.func.isRequired,
  onClose: PropTypes.func,
  captureTabPreview: PropTypes.func
}

const STICKY_EDGE_INSET = 20
const STICKY_LINE_CORNER_GAP = 16
const STICKY_MASK_INSET = 58

const measureTabMetrics = (container) => {
  const button = container.querySelector('.dashboard-tab-item')
  const icon = container.querySelector('.dashboard-tab-item-icon')
  if (!button || !icon) {
    return {
      naturalWidth: container.offsetWidth,
      minWidth: container.offsetWidth
    }
  }

  const styles = window.getComputedStyle(button)
  const minWidth = Math.ceil(
    icon.getBoundingClientRect().width +
      parseFloat(styles.paddingLeft) +
      parseFloat(styles.paddingRight) +
      parseFloat(styles.borderLeftWidth) +
      parseFloat(styles.borderRightWidth)
  )

  return {
    naturalWidth: container.offsetWidth,
    minWidth: Math.max(minWidth, 1)
  }
}

const hideStickyClone = (cloneEl) => {
  if (!cloneEl) return
  delete cloneEl.dataset.edge
  delete cloneEl.dataset.faded
  cloneEl.style.removeProperty('--tab-sticky-width')
  cloneEl.style.removeProperty('--tab-label-opacity')
  cloneEl.style.left = ''
  cloneEl.style.right = ''
  cloneEl.setAttribute('inert', '')
}

const setSimplebarMaskInset = (maskEl, edge, inset) => {
  if (!maskEl) return
  const wrapEl = maskEl.closest('.dashboard-tabs-wrap') || maskEl
  if (!edge) {
    wrapEl.style.removeProperty('--tab-mask-left')
    wrapEl.style.removeProperty('--tab-mask-right')
    return
  }
  if (edge === 'left') {
    wrapEl.style.setProperty('--tab-mask-left', `${inset}px`)
    wrapEl.style.removeProperty('--tab-mask-right')
  } else {
    wrapEl.style.removeProperty('--tab-mask-left')
    wrapEl.style.setProperty('--tab-mask-right', `${inset}px`)
  }
}

const setScrollEdgeFades = (root, scrollEl) => {
  if (!root) return
  if (!scrollEl) {
    root.dataset.atStart = ''
    root.dataset.atEnd = ''
    return
  }
  const atStart = scrollEl.scrollLeft <= 1
  const atEnd =
    scrollEl.scrollLeft + scrollEl.clientWidth >= scrollEl.scrollWidth - 1
  if (atStart) root.dataset.atStart = ''
  else delete root.dataset.atStart
  if (atEnd) root.dataset.atEnd = ''
  else delete root.dataset.atEnd
}

const setStickyStripLine = (root, lineEl, edge, lineInset) => {
  if (root) {
    if (!edge) delete root.dataset.stickyEdge
    else root.dataset.stickyEdge = edge
  }
  const padding = 4
  if (!lineEl) return
  if (!edge) {
    delete lineEl.dataset.edge
    lineEl.style.left = ''
    lineEl.style.right = ''
    return
  }
  lineEl.dataset.edge = edge
  if (edge === 'left') {
    lineEl.style.left = `${lineInset + padding}px`
    lineEl.style.right = '0px'
  } else {
    lineEl.style.left = '0px'
    lineEl.style.right = `${lineInset + padding}px`
  }
}

const setOriginalStickyState = (container, sticky) => {
  if (!container) return
  if (sticky) {
    container.dataset.stickyPlaceholder = 'true'
    container.setAttribute('inert', '')
  } else {
    delete container.dataset.stickyPlaceholder
    container.removeAttribute('inert')
  }
}

const bindActiveTabStickyScroll = (scrollEl, list, cloneEl, root, lineEl) => {
  const state = {
    activeEl: null,
    updating: false
  }
  const maskEl = scrollEl.closest('.simplebar-mask')
  const wrapperEl = scrollEl.closest('.simplebar-wrapper') || scrollEl

  const clearStickyVisuals = () => {
    hideStickyClone(cloneEl)
    setStickyStripLine(root, lineEl, null)
    setSimplebarMaskInset(maskEl, null)
  }

  const update = () => {
    if (state.updating) return
    state.updating = true

    try {
      setScrollEdgeFades(root, scrollEl)
      const container = list.querySelector(
        '.dashboard-tab-item-container-active'
      )
      if (state.activeEl && state.activeEl !== container) {
        setOriginalStickyState(state.activeEl, false)
      }
      state.activeEl = container

      if (!container || !cloneEl) {
        clearStickyVisuals()
        return
      }

      const metrics = measureTabMetrics(container)
      const naturalWidth = metrics.naturalWidth
      const minWidth = Math.min(metrics.minWidth, naturalWidth)
      const maxShrink = Math.max(0, naturalWidth - minWidth)
      const scrollLeft = scrollEl.scrollLeft
      const viewportWidth = wrapperEl.clientWidth
      if (viewportWidth <= 0) {
        setOriginalStickyState(container, false)
        clearStickyVisuals()
        return
      }

      const wrapperRect = wrapperEl.getBoundingClientRect()
      const containerRect = container.getBoundingClientRect()
      const naturalLeft = scrollLeft + (containerRect.left - wrapperRect.left)
      const isFirstTab = container === list.firstElementChild
      if (isFirstTab && scrollLeft < 1) {
        setOriginalStickyState(container, false)
        clearStickyVisuals()
        return
      }
      const overflowLeft = scrollLeft + STICKY_EDGE_INSET - naturalLeft
      const overflowRight =
        naturalLeft +
        naturalWidth -
        (scrollLeft + viewportWidth - STICKY_EDGE_INSET)

      let edge = null
      let overflow = 0
      if (overflowLeft > 0.5 && overflowLeft >= overflowRight) {
        edge = 'left'
        overflow = overflowLeft
      } else if (overflowRight > 0.5) {
        edge = 'right'
        overflow = overflowRight
      }

      if (!edge) {
        setOriginalStickyState(container, false)
        clearStickyVisuals()
        return
      }

      const shrink = Math.min(overflow, maxShrink)
      const visualWidth = Math.max(minWidth, naturalWidth - shrink)
      const shrinkProgress = maxShrink === 0 ? 1 : shrink / maxShrink
      const fade = 1 - shrinkProgress
      const maskInset = STICKY_MASK_INSET * shrinkProgress

      setOriginalStickyState(container, true)
      cloneEl.removeAttribute('inert')
      cloneEl.dataset.edge = edge
      if (fade < 0.25) cloneEl.dataset.faded = 'true'
      else delete cloneEl.dataset.faded

      const parentRect =
        cloneEl.offsetParent?.getBoundingClientRect() || wrapperRect
      const cloneOffset =
        edge === 'left'
          ? wrapperRect.left - parentRect.left + STICKY_EDGE_INSET
          : parentRect.right - wrapperRect.right + STICKY_EDGE_INSET
      if (edge === 'left') {
        cloneEl.style.left = `${cloneOffset}px`
        cloneEl.style.right = 'auto'
      } else {
        cloneEl.style.left = 'auto'
        cloneEl.style.right = `${cloneOffset}px`
      }
      cloneEl.style.setProperty('--tab-sticky-width', `${visualWidth}px`)
      cloneEl.style.setProperty('--tab-label-opacity', String(fade))
      setSimplebarMaskInset(maskEl, edge, maskInset)
      setStickyStripLine(
        root,
        lineEl,
        edge,
        cloneOffset + visualWidth + STICKY_LINE_CORNER_GAP
      )
    } finally {
      state.updating = false
    }
  }

  let frame = 0
  const scheduleUpdate = () => {
    if (frame) return
    frame = window.requestAnimationFrame(() => {
      frame = 0
      update()
    })
  }

  update()
  scrollEl.addEventListener('scroll', scheduleUpdate, { passive: true })
  window.addEventListener('resize', scheduleUpdate)

  const observer = new ResizeObserver(scheduleUpdate)
  observer.observe(scrollEl)
  if (wrapperEl !== scrollEl) observer.observe(wrapperEl)
  observer.observe(list)

  return () => {
    scrollEl.removeEventListener('scroll', scheduleUpdate)
    window.removeEventListener('resize', scheduleUpdate)
    observer.disconnect()
    if (frame) window.cancelAnimationFrame(frame)
    setOriginalStickyState(state.activeEl, false)
    clearStickyVisuals()
    delete root.dataset.atStart
    delete root.dataset.atEnd
  }
}

const useActiveTabStickyScroll = (activeTabId, tabs) => {
  const rootRef = useRef(null)
  const listRef = useRef(null)
  const cloneRef = useRef(null)
  const lineRef = useRef(null)
  const tabLayoutKey = `${activeTabId}:${tabs.map((tab) => `${tab.id}:${tab.title || ''}`).join('|')}`

  useLayoutEffect(() => {
    const root = rootRef.current
    const list = listRef.current
    const cloneEl = cloneRef.current
    const lineEl = lineRef.current
    if (!root || !list) return undefined

    let cancelled = false
    let teardown = () => {}
    let frame = 0

    const tryBind = () => {
      if (cancelled) return
      const scrollEl = root.querySelector('.simplebar-content-wrapper')
      if (!scrollEl) {
        frame = window.requestAnimationFrame(tryBind)
        return
      }
      teardown = bindActiveTabStickyScroll(
        scrollEl,
        list,
        cloneEl,
        root,
        lineEl
      )
    }

    tryBind()

    return () => {
      cancelled = true
      if (frame) window.cancelAnimationFrame(frame)
      teardown()
    }
  }, [tabLayoutKey])

  return { rootRef, listRef, cloneRef, lineRef }
}

const DashboardTabs = () => {
  const {
    tabs,
    activeTabId,
    selectTab,
    addTab,
    registerTabStripRoot,
    closeTab,
    reorderTabs,
    handleTabDragStart,
    handleTabDragEnd,
    handleExternalTabDrop,
    captureTabPreview
  } = useNavigationTabs()
  const { rootRef, listRef, cloneRef, lineRef } = useActiveTabStickyScroll(
    activeTabId,
    tabs
  )
  const [draggedValue, setDraggedValue] = useState(null)
  const [dropTarget, setDropTarget] = useState(null)

  const clearDragState = useCallback(() => {
    setDraggedValue(null)
    setDropTarget(null)
  }, [])

  const handleItemDragStart = (event, tabId) => {
    const tab = tabs.find((item) => item.id === tabId)
    if (!tab) return

    event.stopPropagation()
    const item = event.currentTarget
    if (item) {
      const rect = item.getBoundingClientRect()
      event.dataTransfer.setDragImage(
        item,
        event.clientX - rect.left,
        event.clientY - rect.top
      )
    }

    setDraggedValue(tabId)
    event.dataTransfer.effectAllowed = 'move'
    writeTabDragData(event, {
      tab,
      sourceWindowId: getDesktopWindowId()
    })
    handleTabDragStart(tabId)
  }

  const handleItemDragEnd = () => {
    handleTabDragEnd()
    clearDragState()
  }

  const handleItemDragOver = (event, tab) => {
    const isExternal = hasExternalTabDrag(event)
    if (draggedValue == null && !isExternal) return
    if (draggedValue != null && String(tab.id) === String(draggedValue)) return

    event.preventDefault()
    event.stopPropagation()
    event.dataTransfer.dropEffect = 'move'

    const rect = event.currentTarget.getBoundingClientRect()
    setDropTarget({
      value: tab.id,
      insertBefore: event.clientX < rect.left + rect.width / 2
    })
  }

  const handleItemDrop = (event, tab) => {
    const isExternal = draggedValue == null && hasExternalTabDrag(event)
    event.preventDefault()
    event.stopPropagation()

    const target = dropTarget || {
      value: tab.id,
      insertBefore: true
    }

    if (isExternal) {
      void handleExternalTabDrop(target.value, target.insertBefore)
      clearDragState()
      return
    }

    if (draggedValue == null) return

    if (String(draggedValue) !== String(target.value)) {
      reorderTabs(draggedValue, target.value, target.insertBefore)
    }

    clearDragState()
  }

  const handleListDragOver = (event) => {
    const isExternal = hasExternalTabDrag(event)
    if (draggedValue == null && !isExternal) return
    if (
      event.target instanceof Element &&
      event.target.closest('.dashboard-tab-item')
    ) {
      return
    }

    event.preventDefault()
    event.dataTransfer.dropEffect = 'move'

    const lastTab = tabs[tabs.length - 1]
    if (!lastTab) return
    setDropTarget({
      value: lastTab.id,
      insertBefore: false
    })
  }

  const handleListDrop = (event) => {
    const isExternal = draggedValue == null && hasExternalTabDrag(event)
    if (draggedValue == null && !isExternal) return
    if (
      event.target instanceof Element &&
      event.target.closest('.dashboard-tab-item')
    ) {
      return
    }

    event.preventDefault()
    event.stopPropagation()

    const lastTab = tabs[tabs.length - 1]
    if (!lastTab) {
      clearDragState()
      return
    }

    if (isExternal) {
      void handleExternalTabDrop(lastTab.id, false)
      clearDragState()
      return
    }

    if (String(draggedValue) !== String(lastTab.id)) {
      reorderTabs(draggedValue, lastTab.id, false)
    }

    clearDragState()
  }

  const handleStripDragOver = (event) => {
    if (!hasExternalTabDrag(event)) return
    event.preventDefault()
    event.dataTransfer.dropEffect = 'move'
  }

  const handleStripDrop = (event) => {
    if (!hasExternalTabDrag(event)) return
    event.preventDefault()
    const lastTab = tabs[tabs.length - 1]
    void handleExternalTabDrop(lastTab?.id, false)
  }

  const handleKeyDown = (event, tabIndex) => {
    if (event.key !== 'ArrowRight' && event.key !== 'ArrowLeft') return

    event.preventDefault()
    const direction = event.key === 'ArrowRight' ? 1 : -1
    const currentIndex = tabs.findIndex((tab) => tab.id === activeTabId)
    const startIndex = currentIndex === -1 ? tabIndex : currentIndex
    const nextIndex = (startIndex + direction + tabs.length) % tabs.length
    selectTab(tabs[nextIndex].id)
  }

  const setRootRef = useCallback(
    (element) => {
      rootRef.current = element
      registerTabStripRoot(element)
    },
    [registerTabStripRoot]
  )

  const isReordering = draggedValue != null || dropTarget != null
  const activeTab = tabs.find((tab) => tab.id === activeTabId)
  const activeTabIndex = activeTab
    ? tabs.findIndex((tab) => tab.id === activeTabId)
    : 0

  const tabItemProps = {
    onDragStart: handleItemDragStart,
    onDragEnd: handleItemDragEnd,
    onClick: selectTab,
    onKeyDown: handleKeyDown,
    onDragOver: handleItemDragOver,
    onDrop: handleItemDrop,
    onClose: closeTab,
    captureTabPreview
  }

  return (
    <Flex
      ref={setRootRef}
      align='flex-start'
      gap={4}
      className={classNames(
        'dashboard-tabs',
        'electrobun-webkit-app-region-drag'
      )}
      style={{ flex: 1, minWidth: 0 }}
      onDragOver={handleStripDragOver}
      onDrop={handleStripDrop}
    >
      <ScrollBox className='dashboard-tabs-wrap' horizontal>
        <Flex align='flex-start' gap={5} className='dashboard-tabs-inner'>
          <div
            ref={listRef}
            className={classNames('dashboard-tabs-list', {
              'dashboard-tabs-reordering': isReordering
            })}
            role='tablist'
            onDragOver={handleListDragOver}
            onDrop={handleListDrop}
          >
            {tabs.map((tab, index) => {
              const isSelected = tab.id === activeTabId
              const isDragging =
                draggedValue != null && String(draggedValue) === String(tab.id)
              const isDropTarget =
                dropTarget != null &&
                String(dropTarget.value) === String(tab.id) &&
                String(draggedValue) !== String(tab.id)

              return (
                <div
                  key={tab.id}
                  className={classNames('dashboard-tab-item-container', {
                    'dashboard-tab-item-container-active': isSelected
                  })}
                >
                  <DashboardTabItem
                    tab={tab}
                    tabIndex={index}
                    isSelected={isSelected}
                    isDragging={isDragging}
                    htmlId={`dashboard-tab-item-${tab.id}`}
                    dropPosition={
                      isDropTarget
                        ? dropTarget.insertBefore
                          ? 'before'
                          : 'after'
                        : undefined
                    }
                    {...tabItemProps}
                  />
                </div>
              )
            })}
          </div>
          <div className='dashboard-tabs-add-button-container'>
            <Button
              type='text'
              className='dashboard-tabs-add-button electrobun-webkit-app-region-no-drag'
              onClick={() => addTab()}
              icon={<PlusIcon style={{ fontSize: 14, marginTop: 3 }} />}
            />
          </div>
        </Flex>
      </ScrollBox>
      <div
        ref={lineRef}
        className='dashboard-tabs-sticky-line'
        aria-hidden='true'
      />
      {activeTab ? (
        <div
          ref={cloneRef}
          className='dashboard-tab-sticky-clone dashboard-tab-item-container dashboard-tab-item-container-active'
        >
          <DashboardTabItem
            tab={activeTab}
            tabIndex={activeTabIndex}
            isSelected
            isDragging={
              draggedValue != null &&
              String(draggedValue) === String(activeTab.id)
            }
            {...tabItemProps}
          />
        </div>
      ) : null}
    </Flex>
  )
}

export default DashboardTabs