import PropTypes from 'prop-types'
import { useCallback, useState } from 'react'
import { Button, Flex, Typography } from 'antd'
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 { useNavigationTabs } from '../context/NavigationTabsContext'
import { getDesktopWindowId } from '../../../electrobun-bridge.js'
import { hasExternalTabDrag, writeTabDragData } from './tabDrag'

const { Text } = Typography

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-inner' />
    </span>
    <span
      className='dashboard-tab-item-corner dashboard-tab-item-corner-right'
      aria-hidden='true'
    >
      <span className='dashboard-tab-item-corner-inner' />
    </span>
  </>
)

const DashboardTabLabel = ({ tab, onClose }) => (
  <Flex align='center' gap={6} className='dashboard-tabs-label'>
    <Text ellipsis style={{ maxWidth: 240 }}>
      {tab.title || 'Farm Control'}
    </Text>
    <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 DashboardTabs = () => {
  const {
    tabs,
    activeTabId,
    selectTab,
    addTab,
    closeTab,
    reorderTabs,
    handleTabDragStart,
    handleTabDragEnd,
    handleExternalTabDrop
  } = useNavigationTabs()
  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 isReordering = draggedValue != null || dropTarget != null

  return (
    <Flex
      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
        horizontalBottomPadding={0}
      >
        <Flex align='flex-start' gap={8} className='dashboard-tabs-inner'>
          <div
            className={classNames('dashboard-tabs-list', {
              'dashboard-tabs-reordering': isReordering
            })}
            role='tablist'
            onDragOver={handleListDragOver}
            onDrop={handleListDrop}
          >
            {tabs.map((tab, index) => {
              const model = tab.modelName ? getModelByName(tab.modelName) : null
              const Icon = model?.icon || HomeIcon
              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
                  })}
                >
                  <button
                    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':
                          isDropTarget && dropTarget.insertBefore,
                        'dashboard-tab-item-drop-after':
                          isDropTarget && !dropTarget.insertBefore
                      }
                    )}
                    draggable
                    onDragStart={(event) => handleItemDragStart(event, tab.id)}
                    onDragEnd={handleItemDragEnd}
                    onClick={() => selectTab(tab.id)}
                    onKeyDown={(event) => handleKeyDown(event, index)}
                    onDragOver={(event) => handleItemDragOver(event, tab)}
                    onDrop={(event) => handleItemDrop(event, tab)}
                  >
                    <DashboardTabChrome />
                    <span className='dashboard-tab-item-icon'>
                      <Icon
                        style={{ fontSize: 14, marginTop: '-2px' }}
                        color='secondary'
                      />
                    </span>
                    <DashboardTabLabel tab={tab} onClose={closeTab} />
                  </button>
                </div>
              )
            })}
          </div>
          <Button
            type='text'
            size='small'
            className='dashboard-tabs-add-button electrobun-webkit-app-region-no-drag'
            onClick={addTab}
            icon={<PlusIcon style={{ fontSize: 14, marginTop: 3 }} />}
          />
        </Flex>
      </ScrollBox>
    </Flex>
  )
}

export default DashboardTabs