'use client'
import { BookOpenCheck, Check, FileText, Layers, Video, ChevronLeft, ChevronRight } from 'lucide-react'
import React, { useMemo, memo, useState } from 'react'
import ToolTip from '@components/Objects/StyledElements/Tooltip/Tooltip'
import { getUriWithOrg } from '@services/config/config'
import Link from 'next/link'
import { useRouter } from 'next/navigation'

interface Props {
  course: any
  orgslug: string
  course_uuid: string
  current_activity?: string
  enableNavigation?: boolean
}

// Helper functions
function getActivityTypeLabel(activityType: string): string {
  switch (activityType) {
    case 'TYPE_VIDEO':
      return 'Video'
    case 'TYPE_DOCUMENT':
      return 'Document'
    case 'TYPE_DYNAMIC':
      return 'Interactive'
    case 'TYPE_ASSIGNMENT':
      return 'Assignment'
    default:
      return 'Unknown'
  }
}

function getActivityTypeBadgeColor(activityType: string): string {
  switch (activityType) {
    case 'TYPE_VIDEO':
      return 'bg-blue-100 text-blue-700'
    case 'TYPE_DOCUMENT':
      return 'bg-purple-100 text-purple-700'
    case 'TYPE_DYNAMIC':
      return 'bg-green-100 text-green-700'
    case 'TYPE_ASSIGNMENT':
      return 'bg-orange-100 text-orange-700'
    default:
      return 'bg-gray-100 text-gray-700'
  }
}

// Memoized activity type icon component
const ActivityTypeIcon = memo(({ activityType }: { activityType: string }) => {
  switch (activityType) {
    case 'TYPE_VIDEO':
      return <Video size={16} className="text-gray-400" />
    case 'TYPE_DOCUMENT':
      return <FileText size={16} className="text-gray-400" />
    case 'TYPE_DYNAMIC':
      return <Layers size={16} className="text-gray-400" />
    case 'TYPE_ASSIGNMENT':
      return <BookOpenCheck size={16} className="text-gray-400" />
    default:
      return <FileText size={16} className="text-gray-400" />
  }
});

ActivityTypeIcon.displayName = 'ActivityTypeIcon';

// Memoized activity tooltip content
const ActivityTooltipContent = memo(({ 
  activity, 
  isDone, 
  isCurrent 
}: { 
  activity: any, 
  isDone: boolean, 
  isCurrent: boolean 
}) => (
  <div className="bg-white rounded-lg nice-shadow py-3 px-4 min-w-[200px] animate-in fade-in duration-200">
    <div className="flex items-center gap-2">
      <ActivityTypeIcon activityType={activity.activity_type} />
      <span className="text-sm text-gray-700">{activity.name}</span>
      {isDone && (
        <span className="ml-auto text-gray-400">
          <Check size={14} />
        </span>
      )}
    </div>
    <div className="flex items-center gap-2 mt-2">
      <span className={`text-xs px-2 py-0.5 rounded-full ${getActivityTypeBadgeColor(activity.activity_type)}`}>
        {getActivityTypeLabel(activity.activity_type)}
      </span>
      <span className="text-xs text-gray-400">
        {isCurrent ? 'Current Activity' : isDone ? 'Completed' : 'Not Started'}
      </span>
    </div>
  </div>
));

ActivityTooltipContent.displayName = 'ActivityTooltipContent';

function ActivityIndicators(props: Props) {
  const course = props.course
  const orgslug = props.orgslug
  const courseid = props.course_uuid.replace('course_', '')
  const enableNavigation = props.enableNavigation || false
  const router = useRouter()

  const [currentIndex, setCurrentIndex] = useState(0)

  const done_activity_style = 'bg-teal-600 hover:bg-teal-700'
  const black_activity_style = 'bg-zinc-300 hover:bg-zinc-400'
  const current_activity_style = 'bg-gray-600 animate-pulse hover:bg-gray-700'

  const trail = props.course.trail

  // Flatten all activities for navigation and rendering
  const allActivities = useMemo(() => {
    return course.chapters.flatMap((chapter: any) => 
      chapter.activities.map((activity: any) => ({
        ...activity,
        chapterId: chapter.id
      }))
    )
  }, [course.chapters])

  // Find current activity index
  const currentActivityIndex = useMemo(() => {
    if (!props.current_activity) return -1
    return allActivities.findIndex((activity: any) => 
      activity.activity_uuid.replace('activity_', '') === props.current_activity
    )
  }, [allActivities, props.current_activity])

  // Memoize activity status checks
  const isActivityDone = useMemo(() => (activity: any) => {
    let run = props.course.trail?.runs.find(
      (run: any) => run.course_id == props.course.id
    )
    if (run) {
      return run.steps.find((step: any) => step.activity_id == activity.id)
    }
    return false
  }, [props.course]);

  const isActivityCurrent = useMemo(() => (activity: any) => {
    let activity_uuid = activity.activity_uuid.replace('activity_', '')
    if (props.current_activity && props.current_activity == activity_uuid) {
      return true
    }
    return false
  }, [props.current_activity]);

  const getActivityClass = useMemo(() => (activity: any) => {
    const isCurrent = isActivityCurrent(activity)
    if (isActivityDone(activity)) {
      return `${done_activity_style}`
    }
    if (isCurrent) {
      return `${current_activity_style} border-2 border-gray-800 animate-pulse`
    }
    return `${black_activity_style}`
  }, [isActivityDone, isActivityCurrent]);

  const navigateToPrevious = () => {
    if (currentActivityIndex > 0) {
      const prevActivity = allActivities[currentActivityIndex - 1]
      const activityId = prevActivity.activity_uuid.replace('activity_', '')
      router.push(getUriWithOrg(orgslug, '') + `/course/${courseid}/activity/${activityId}`)
    }
  }

  const navigateToNext = () => {
    if (currentActivityIndex < allActivities.length - 1) {
      const nextActivity = allActivities[currentActivityIndex + 1]
      const activityId = nextActivity.activity_uuid.replace('activity_', '')
      router.push(getUriWithOrg(orgslug, '') + `/course/${courseid}/activity/${activityId}`)
    }
  }

  return (
    <div className="flex items-center gap-4">
      {enableNavigation && (
        <button
          onClick={navigateToPrevious}
          disabled={currentActivityIndex <= 0}
          className="p-1 rounded-full hover:bg-gray-100 disabled:opacity-50 disabled:cursor-not-allowed transition-colors flex-shrink-0"
          aria-label="Previous activity"
        >
          <ChevronLeft size={20} className="text-gray-600" />
        </button>
      )}
      
      <div className="flex items-center w-full">
        {allActivities.map((activity: any) => {
          const isDone = isActivityDone(activity)
          const isCurrent = isActivityCurrent(activity)
          return (
            <ToolTip
              sideOffset={8}
              unstyled
              content={
                <ActivityTooltipContent 
                  activity={activity}
                  isDone={isDone}
                  isCurrent={isCurrent}
                />
              }
              key={activity.activity_uuid}
            >
              <Link
                prefetch={false}
                href={
                  getUriWithOrg(orgslug, '') +
                  `/course/${courseid}/activity/${activity.activity_uuid.replace(
                    'activity_',
                    ''
                  )}`
                }
                className={`${isCurrent ? 'flex-[2]' : 'flex-1'} mx-1`}
              >
                <div
                  className={`h-[7px] ${getActivityClass(activity)} rounded-lg transition-all`}
                ></div>
              </Link>
            </ToolTip>
          )
        })}
      </div>

      {enableNavigation && (
        <button
          onClick={navigateToNext}
          disabled={currentActivityIndex >= allActivities.length - 1}
          className="p-1 rounded-full hover:bg-gray-100 disabled:opacity-50 disabled:cursor-not-allowed transition-colors flex-shrink-0"
          aria-label="Next activity"
        >
          <ChevronRight size={20} className="text-gray-600" />
        </button>
      )}
    </div>
  )
}

export default memo(ActivityIndicators)