'use client'

import { useState, useEffect } from 'react'
import { formatNumber } from '@ciphera-net/ui'
import * as Flags from 'country-flag-icons/react/3x2'
import iso3166 from 'iso-3166-2'
import WorldMap from './WorldMap'
import { Modal, GlobeIcon } from '@ciphera-net/ui'
import { ListSkeleton } from '@/components/skeletons'
import { SiTorproject } from 'react-icons/si'
import { FaUserSecret, FaSatellite } from 'react-icons/fa'
import { getCountries, getCities, getRegions } from '@/lib/api/stats'

interface LocationProps {
  countries: Array<{ country: string; pageviews: number }>
  cities: Array<{ city: string; country: string; pageviews: number }>
  regions: Array<{ region: string; country: string; pageviews: number }>
  geoDataLevel?: 'full' | 'country' | 'none'
  siteId: string
  dateRange: { start: string, end: string }
}

type Tab = 'map' | 'countries' | 'regions' | 'cities'

const LIMIT = 7

export default function Locations({ countries, cities, regions, geoDataLevel = 'full', siteId, dateRange }: LocationProps) {
  const [activeTab, setActiveTab] = useState<Tab>('map')
  const [isModalOpen, setIsModalOpen] = useState(false)
  type LocationItem = { country?: string; city?: string; region?: string; pageviews: number }
  const [fullData, setFullData] = useState<LocationItem[]>([])
  const [isLoadingFull, setIsLoadingFull] = useState(false)

  useEffect(() => {
    if (isModalOpen) {
      const fetchData = async () => {
        setIsLoadingFull(true)
        try {
          let data: LocationItem[] = []
          if (activeTab === 'countries') {
            data = await getCountries(siteId, dateRange.start, dateRange.end, 250)
          } else if (activeTab === 'regions') {
            data = await getRegions(siteId, dateRange.start, dateRange.end, 250)
          } else if (activeTab === 'cities') {
            data = await getCities(siteId, dateRange.start, dateRange.end, 250)
          }
          setFullData(data)
        } catch (e) {
          console.error(e)
        } finally {
          setIsLoadingFull(false)
        }
      }
      fetchData()
    } else {
      setFullData([])
    }
  }, [isModalOpen, activeTab, siteId, dateRange])

  const getFlagComponent = (countryCode: string) => {
    if (!countryCode || countryCode === 'Unknown') return null
    
    switch (countryCode) {
      case 'T1':
        return <SiTorproject className="w-5 h-5 text-purple-600 dark:text-purple-400" />
      case 'A1':
        return <FaUserSecret className="w-5 h-5 text-neutral-600 dark:text-neutral-400" />
      case 'A2':
        return <FaSatellite className="w-5 h-5 text-blue-500 dark:text-blue-400" />
      case 'O1':
      case 'EU':
      case 'AP':
        return <GlobeIcon className="w-5 h-5 text-neutral-500 dark:text-neutral-400" />
    }

    const FlagComponent = (Flags as Record<string, React.ComponentType<{ className?: string }>>)[countryCode]
    return FlagComponent ? <FlagComponent className="w-5 h-5 rounded-sm shadow-sm" /> : null
  }

  const getCountryName = (code: string) => {
    if (!code || code === 'Unknown') return 'Unknown'
    
    switch (code) {
      case 'T1': return 'Tor Network'
      case 'A1': return 'Anonymous Proxy'
      case 'A2': return 'Satellite Provider'
      case 'O1': return 'Other'
      case 'EU': return 'Europe'
      case 'AP': return 'Asia/Pacific'
    }
    
    try {
      const regionNames = new Intl.DisplayNames(['en'], { type: 'region' })
      return regionNames.of(code) || code
    } catch (e) {
      return code
    }
  }

  const getRegionName = (regionCode: string, countryCode: string) => {
    // Check for special country codes first
    switch (countryCode) {
      case 'T1': return 'Tor Network'
      case 'A1': return 'Anonymous Proxy'
      case 'A2': return 'Satellite Provider'
      case 'O1': return 'Other'
      case 'EU': return 'Europe'
      case 'AP': return 'Asia/Pacific'
    }

    if (!regionCode || regionCode === 'Unknown' || !countryCode || countryCode === 'Unknown') return 'Unknown'
    
    try {
      const countryData = iso3166.data[countryCode]
      if (!countryData || !countryData.sub) return regionCode
      
      // ISO 3166-2 structure keys are typically "US-OR"
      const fullCode = `${countryCode}-${regionCode}`
      const regionData = countryData.sub[fullCode]
      
      if (regionData && regionData.name) {
        return regionData.name
      }
      
      return regionCode
    } catch (e) {
      return regionCode
    }
  }

  const getCityName = (city: string) => {
    // Check for special codes that might appear in city field
    switch (city) {
      case 'T1': return 'Tor Network'
      case 'A1': return 'Anonymous Proxy'
      case 'A2': return 'Satellite Provider'
      case 'O1': return 'Other'
    }
    
    if (!city || city === 'Unknown') return 'Unknown'
    return city
  }

  const getData = () => {
    switch (activeTab) {
      case 'countries': return countries
      case 'regions': return regions
      case 'cities': return cities
      default: return []
    }
  }

  // Check if the current tab's data is disabled by privacy settings
  const isTabDisabled = () => {
    if (geoDataLevel === 'none') return true
    if (geoDataLevel === 'country' && (activeTab === 'regions' || activeTab === 'cities')) return true
    return false
  }

  // Filter out "Unknown" entries that result from disabled collection
  const filterUnknown = (data: LocationItem[]) => {
    return data.filter(item => {
      if (activeTab === 'countries') return item.country && item.country !== 'Unknown' && item.country !== ''
      if (activeTab === 'regions') return item.region && item.region !== 'Unknown' && item.region !== ''
      if (activeTab === 'cities') return item.city && item.city !== 'Unknown' && item.city !== ''
      return true
    })
  }

  const rawData = activeTab === 'map' ? [] : getData()
  const data = filterUnknown(rawData)
  const hasData = activeTab === 'map'
    ? (countries && filterUnknown(countries).length > 0)
    : (data && data.length > 0)
  const displayedData = (activeTab !== 'map' && hasData) ? data.slice(0, LIMIT) : []
  const emptySlots = Math.max(0, LIMIT - displayedData.length)
  const showViewAll = activeTab !== 'map' && hasData && data.length > LIMIT

  const getDisabledMessage = () => {
    if (geoDataLevel === 'none') {
      return 'Geographic data collection is disabled in site settings'
    }
    if (geoDataLevel === 'country' && (activeTab === 'regions' || activeTab === 'cities')) {
      return `${activeTab === 'regions' ? 'Region' : 'City'} tracking is disabled. Only country-level data is collected.`
    }
    return 'No data available'
  }

  return (
    <>
      <div className="bg-white dark:bg-neutral-900 border border-neutral-200 dark:border-neutral-800 rounded-2xl p-6 h-full flex flex-col">
        <div className="flex items-center justify-between mb-6">
          <div className="flex items-center gap-4">
            <h3 className="text-lg font-semibold text-neutral-900 dark:text-white">
              Locations
            </h3>
            {showViewAll && (
              <button
                onClick={() => setIsModalOpen(true)}
                className="text-xs font-medium text-neutral-500 hover:text-neutral-900 dark:text-neutral-400 dark:hover:text-white transition-colors focus:outline-none focus:ring-2 focus:ring-brand-orange focus:rounded"
              >
                View All
              </button>
            )}
          </div>
          <div className="flex p-1 bg-neutral-100 dark:bg-neutral-800 rounded-lg" role="tablist" aria-label="Location view tabs">
            {(['map', 'countries', 'regions', 'cities'] as Tab[]).map((tab) => (
              <button
                key={tab}
                onClick={() => setActiveTab(tab)}
                role="tab"
                aria-selected={activeTab === tab}
                className={`px-3 py-1 text-xs font-medium rounded-lg transition-colors capitalize focus:outline-none focus:ring-2 focus:ring-brand-orange ${
                  activeTab === tab
                    ? 'bg-white dark:bg-neutral-700 text-neutral-900 dark:text-white shadow-sm'
                    : 'text-neutral-600 dark:text-neutral-400 hover:text-neutral-900 dark:hover:text-white'
                }`}
              >
                {tab}
              </button>
            ))}
          </div>
        </div>

        <div className="space-y-2 flex-1 min-h-[270px]">
          {isTabDisabled() ? (
            <div className="h-full flex flex-col items-center justify-center text-center px-4">
              <p className="text-neutral-500 dark:text-neutral-400 text-sm">{getDisabledMessage()}</p>
            </div>
          ) : activeTab === 'map' ? (
            hasData ? <WorldMap data={filterUnknown(countries) as { country: string; pageviews: number }[]} /> : (
              <div className="h-full flex flex-col items-center justify-center text-center px-6 py-8 gap-3">
                <div className="rounded-full bg-neutral-100 dark:bg-neutral-800 p-4">
                  <GlobeIcon className="w-8 h-8 text-neutral-500 dark:text-neutral-400" />
                </div>
                <h4 className="font-semibold text-neutral-900 dark:text-white">
                  No location data yet
                </h4>
                <p className="text-sm text-neutral-500 dark:text-neutral-400 max-w-xs">
                  Visitor locations will appear here based on anonymous geographic data.
                </p>
              </div>
            )
          ) : (
            hasData ? (
              <>
                {displayedData.map((item, index) => (
                  <div key={index} className="flex items-center justify-between h-9 group hover:bg-neutral-50 dark:hover:bg-neutral-800 rounded-lg px-2 -mx-2 transition-colors">
                    <div className="flex-1 truncate text-neutral-900 dark:text-white flex items-center gap-3">
                      {activeTab === 'countries' && <span className="shrink-0">{getFlagComponent(item.country ?? '')}</span>}
                      {activeTab !== 'countries' && <span className="shrink-0">{getFlagComponent(item.country ?? '')}</span>}

                      <span className="truncate">
                        {activeTab === 'countries' ? getCountryName(item.country ?? '') :
                         activeTab === 'regions' ? getRegionName(item.region ?? '', item.country ?? '') :
                         getCityName(item.city ?? '')}
                      </span>
                    </div>
                    <div className="text-sm font-semibold text-neutral-600 dark:text-neutral-400 ml-4">
                      {formatNumber(item.pageviews)}
                    </div>
                  </div>
                ))}
                {Array.from({ length: emptySlots }).map((_, i) => (
                  <div key={`empty-${i}`} className="h-9 px-2 -mx-2" aria-hidden="true" />
              ))}
            </>
          ) : (
            <div className="h-full flex flex-col items-center justify-center text-center px-6 py-8 gap-3">
              <div className="rounded-full bg-neutral-100 dark:bg-neutral-800 p-4">
                <GlobeIcon className="w-8 h-8 text-neutral-500 dark:text-neutral-400" />
              </div>
              <h4 className="font-semibold text-neutral-900 dark:text-white">
                No location data yet
              </h4>
              <p className="text-sm text-neutral-500 dark:text-neutral-400 max-w-xs">
                Visitor locations will appear here based on anonymous geographic data.
              </p>
            </div>
          )
        )}
        </div>
      </div>

      <Modal
        isOpen={isModalOpen}
        onClose={() => setIsModalOpen(false)}
        title={`Locations - ${activeTab.charAt(0).toUpperCase() + activeTab.slice(1)}`}
      >
        <div className="space-y-3 max-h-[60vh] overflow-y-auto pr-2">
          {isLoadingFull ? (
            <div className="py-4">
              <ListSkeleton rows={10} />
            </div>
          ) : (
            (fullData.length > 0 ? fullData : data).map((item, index) => (
              <div key={index} className="flex items-center justify-between py-2 group hover:bg-neutral-50 dark:hover:bg-neutral-800 rounded-lg px-2 -mx-2 transition-colors">
                <div className="flex-1 truncate text-neutral-900 dark:text-white flex items-center gap-3">
                  <span className="shrink-0">{getFlagComponent(item.country ?? '')}</span>
                  <span className="truncate">
                    {activeTab === 'countries' ? getCountryName(item.country ?? '') : 
                     activeTab === 'regions' ? getRegionName(item.region ?? '', item.country ?? '') :
                     getCityName(item.city ?? '')}
                  </span>
                </div>
                <div className="text-sm font-semibold text-neutral-600 dark:text-neutral-400 ml-4">
                  {formatNumber(item.pageviews)}
                </div>
              </div>
            ))
          )}
        </div>
      </Modal>
    </>
  )
}