import * as React from 'react'
import {
  Dialog,
  DialogContent,
  DialogHeader,
  DialogTitle,
  DialogDescription,
  DialogFooter,
  DialogClose,
} from '@/components/ui/dialog'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Ic } from '@/icons'
import { Shimmer } from '@/components/shared/shimmer_frontend'
import { TourDetailOverviewShimmer } from './TourDetailShimmer'
import {
  fetchTourTranslations,
  saveTourTranslations,
  fetchTourItineraryTranslations,
  saveTourItineraryTranslation,
} from '../services/tour-api'
import type {
  TourTranslationsResponse,
  TourTranslationData,
  TourItineraryTranslationsResponseItem,
} from '../types'

interface TourTranslationsDialogProps {
  tourId: number | null
  tourTitle?: string
  open: boolean
  onOpenChange: (open: boolean) => void
  onSuccess?: () => void
}

const SUPPORTED_LANGUAGES = [
  { code: 'ar', label: 'العربية', flag: '🇸🇦', dir: 'rtl' },
  { code: 'fa', label: 'فارسی', flag: '🇮🇷', dir: 'rtl' },
  { code: 'en', label: 'English', flag: '🇬🇧', dir: 'ltr' },
  { code: 'ru', label: 'Русский', flag: '🇷🇺', dir: 'ltr' },
  { code: 'id', label: 'Indonesia', flag: '🇮🇩', dir: 'ltr' },
] as const

type LangCode = (typeof SUPPORTED_LANGUAGES)[number]['code']

export function TourTranslationsDialog({
  tourId,
  tourTitle,
  open,
  onOpenChange,
  onSuccess,
}: TourTranslationsDialogProps) {
  const [selectedLang, setSelectedLang] = React.useState<LangCode>('ar')
  const [activeSection, setActiveSection] = React.useState<'base' | 'features' | 'tips' | 'itinerary'>('base')
  const [isLoading, setIsLoading] = React.useState<boolean>(false)
  const [isSaving, setIsSaving] = React.useState<boolean>(false)
  const [errorMessage, setErrorMessage] = React.useState<string | null>(null)
  const [successMessage, setSuccessMessage] = React.useState<string | null>(null)

  // Translations data
  const [transData, setTransData] = React.useState<TourTranslationsResponse | null>(null)
  const [itineraries, setItineraries] = React.useState<TourItineraryTranslationsResponseItem[]>([])

  // Local draft states for current selected language
  const [formTitle, setFormTitle] = React.useState<string>('')
  const [formDesc, setFormDesc] = React.useState<string>('')
  const [formFeatures, setFormFeatures] = React.useState<string[]>([])
  const [newFeatureText, setNewFeatureText] = React.useState<string>('')
  const [formTips, setFormTips] = React.useState<{ title: string; desc: string }[]>([])
  const [newTipTitle, setNewTipTitle] = React.useState<string>('')
  const [newTipDesc, setNewTipDesc] = React.useState<string>('')

  // Drafts for itineraries: { [itineraryId]: { title: string, summary: string } }
  const [itinDrafts, setItinDrafts] = React.useState<Record<number, { title: string; summary: string }>>({})

  // Load translations on open
  React.useEffect(() => {
    if (!open || !tourId) return

    let isMounted = true
    setIsLoading(true)
    setErrorMessage(null)
    setSuccessMessage(null)

    Promise.all([
      fetchTourTranslations(tourId),
      fetchTourItineraryTranslations(tourId).catch(() => []),
    ])
      .then(([tourTrans, itinTrans]) => {
        if (!isMounted) return
        setTransData(tourTrans)
        setItineraries(itinTrans || [])

        // Default to a language different from primary if primary is English/Persian
        const defaultLang = tourTrans.primary_language === 'fa' ? 'ar' : 'fa'
        setSelectedLang(defaultLang as LangCode)
        initDraftForLanguage(defaultLang as LangCode, tourTrans, itinTrans || [])
      })
      .catch((err) => {
        if (!isMounted) return
        setErrorMessage(err?.message || 'خطا در بارگذاری ترجمه‌های تور از سرور.')
      })
      .finally(() => {
        if (isMounted) setIsLoading(false)
      })

    return () => {
      isMounted = false
    }
  }, [open, tourId])

  // Sync draft whenever selectedLang changes
  const initDraftForLanguage = (
    lang: LangCode,
    tourTrans: TourTranslationsResponse | null,
    itinList: TourItineraryTranslationsResponseItem[]
  ) => {
    if (!tourTrans) return

    const isPrimary = tourTrans.primary_language === lang
    const existingTour = isPrimary
      ? {
          title: tourTrans.primary_data.title || '',
          description: tourTrans.primary_data.description || '',
          tour_feature: tourTrans.primary_data.tour_feature || [],
          travel_tips: tourTrans.primary_data.travel_tips || {},
        }
      : tourTrans.translations[lang] || {
          title: '',
          description: '',
          tour_feature: [],
          travel_tips: {},
        }

    setFormTitle(existingTour.title || '')
    setFormDesc(existingTour.description || '')

    const featuresList = (existingTour.tour_feature || []).map((f) => f.title)
    setFormFeatures(featuresList)

    const tipsList = Object.entries(existingTour.travel_tips || {}).map(([title, desc]) => ({
      title,
      desc: String(desc),
    }))
    setFormTips(tipsList)

    // Init itinerary drafts for this language
    const drafts: Record<number, { title: string; summary: string }> = {}
    itinList.forEach((it) => {
      const itTrans = it.translations[lang]
      drafts[it.id] = {
        title: itTrans?.title || '',
        summary: itTrans?.summary || '',
      }
    })
    setItinDrafts(drafts)
  }

  const handleLanguageChange = (lang: LangCode) => {
    setSelectedLang(lang)
    setErrorMessage(null)
    setSuccessMessage(null)
    initDraftForLanguage(lang, transData, itineraries)
  }

  const handleAddFeature = () => {
    if (!newFeatureText.trim()) return
    setFormFeatures((prev) => [...prev, newFeatureText.trim()])
    setNewFeatureText('')
  }

  const handleRemoveFeature = (idx: number) => {
    setFormFeatures((prev) => prev.filter((_, i) => i !== idx))
  }

  const handleAddTip = () => {
    if (!newTipTitle.trim() || !newTipDesc.trim()) return
    setFormTips((prev) => [...prev, { title: newTipTitle.trim(), desc: newTipDesc.trim() }])
    setNewTipTitle('')
    setNewTipDesc('')
  }

  const handleRemoveTip = (idx: number) => {
    setFormTips((prev) => prev.filter((_, i) => i !== idx))
  }

  const handleItineraryDraftChange = (itId: number, field: 'title' | 'summary', val: string) => {
    setItinDrafts((prev) => ({
      ...prev,
      [itId]: {
        title: prev[itId]?.title || '',
        summary: prev[itId]?.summary || '',
        [field]: val,
      },
    }))
  }

  const handleSave = async () => {
    if (!tourId || !transData) return
    if (!formTitle.trim() && !isPrimary) {
      setErrorMessage(`وارد کردن عنوان تور برای زبان ${activeLangConfig?.label || selectedLang} اجباری است.`)
      return
    }
    setIsSaving(true)
    setErrorMessage(null)
    setSuccessMessage(null)

    try {
      // Build tour_feature array
      const tour_feature = formFeatures.map((title) => ({ title }))

      // Build travel_tips object
      const travel_tips: Record<string, string> = {}
      formTips.forEach((item) => {
        travel_tips[item.title] = item.desc
      })

      // 1. Save Tour translation
      await saveTourTranslations(tourId, {
        lang_code: selectedLang,
        title: formTitle.trim(),
        description: formDesc.trim(),
        tour_feature,
        travel_tips,
      })

      // 2. Save Itinerary translations
      const itinSavePromises = Object.entries(itinDrafts).map(([itIdStr, draft]) => {
        const itId = Number(itIdStr)
        if (!draft.title.trim() && !draft.summary.trim()) return Promise.resolve()
        return saveTourItineraryTranslation(tourId, {
          itinerary_id: itId,
          lang_code: selectedLang,
          title: draft.title.trim(),
          summary: draft.summary.trim(),
        })
      })

      await Promise.all(itinSavePromises)

      // Refresh data
      const [updatedTour, updatedItin] = await Promise.all([
        fetchTourTranslations(tourId),
        fetchTourItineraryTranslations(tourId).catch(() => []),
      ])
      setTransData(updatedTour)
      setItineraries(updatedItin || [])

      setSuccessMessage(`ترجمه زبان ${SUPPORTED_LANGUAGES.find((l) => l.code === selectedLang)?.label} با موفقیت در دیتابیس ذخیره شد.`)
      if (onSuccess) onSuccess()
    } catch (err: any) {
      setErrorMessage(err?.message || 'خطا در ذخیره ترجمه در سرور.')
    } finally {
      setIsSaving(false)
    }
  }

  const activeLangConfig = SUPPORTED_LANGUAGES.find((l) => l.code === selectedLang)
  const isPrimary = transData?.primary_language === selectedLang

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-[760px] p-0 overflow-hidden max-h-[90vh] flex flex-col">
        {/* Dialog Header */}
        <DialogHeader className="px-6 pt-5 pb-4 border-b border-border/50 bg-secondary/15">
          <div className="flex items-center justify-between">
            <div className="flex items-center gap-2.5">
              <div className="flex size-9 items-center justify-center rounded-xl bg-primary/10 text-primary">
                <Ic name="globe" className="size-5" />
              </div>
              <div>
                <DialogTitle className="text-base font-extrabold text-foreground">
                  مدیریت ترجمه‌های 5 زبانه تور
                </DialogTitle>
                <DialogDescription className="text-xs text-grey-3 mt-0.5">
                  {tourTitle || `تور شناسه #${tourId}`} &bull; ذخیره‌سازی پویا در سرور و پایگاه‌داده
                </DialogDescription>
              </div>
            </div>

            <div className="flex items-center gap-2">
              {/* Primary Language Indicator */}
              {transData && (
                <div className="flex items-center gap-1.5 rounded-full bg-surface-2 px-3 py-1 text-xs text-grey-2 border border-border/40">
                  <span className="text-grey-3">زبان پایه دیتابیس:</span>
                  <span className="font-bold text-foreground">
                    {SUPPORTED_LANGUAGES.find((l) => l.code === transData.primary_language)?.label ||
                      transData.primary_language}
                  </span>
                </div>
              )}

              {/* دکمه ضربدر بالای مودال */}
              <button
                type="button"
                onClick={() => onOpenChange(false)}
                aria-label="بستن پنجره"
                title="بستن"
                className="flex size-8 items-center justify-center rounded-lg text-grey-3 hover:text-foreground hover:bg-white/10 transition-colors shrink-0 cursor-pointer mr-1"
              >
                <Ic name="x" className="size-4.5" />
              </button>
            </div>
          </div>

          {/* 5-Language Selector Bar */}
          <div className="flex items-center gap-1.5 mt-4 overflow-x-auto pb-1">
            {SUPPORTED_LANGUAGES.map((lang) => {
              const isSelected = lang.code === selectedLang
              const hasTrans = Boolean(
                transData?.primary_language === lang.code ||
                  transData?.translations[lang.code]?.title
              )
              return (
                <button
                  key={lang.code}
                  type="button"
                  onClick={() => handleLanguageChange(lang.code)}
                  className={`flex items-center gap-2 rounded-xl px-3.5 py-2 text-xs font-bold transition-all ${
                    isSelected
                      ? 'bg-primary text-white shadow-md'
                      : 'bg-surface-2 text-grey-2 hover:bg-surface-3 hover:text-foreground border border-border/30'
                  }`}
                >
                  <span className="text-sm">{lang.flag}</span>
                  <span>{lang.label}</span>
                  {hasTrans && !isSelected && (
                    <span className="size-1.5 rounded-full bg-emerald-500" />
                  )}
                  {transData?.primary_language === lang.code && (
                    <span className="text-[10px] opacity-80">(اصلی)</span>
                  )}
                </button>
              )
            })}
          </div>
        </DialogHeader>

        {/* Dialog Body */}
        <div className="flex-1 overflow-y-auto px-6 py-5 space-y-5">
          {isLoading ? (
            <TourDetailOverviewShimmer />
          ) : (
            <>
              {errorMessage && (
                <div className="flex items-center gap-2 rounded-xl bg-rose-500/10 border border-rose-500/20 px-4 py-3 text-xs text-rose-400">
                  <Ic name="alert" className="size-4 shrink-0" />
                  <span>{errorMessage}</span>
                </div>
              )}

              {successMessage && (
                <div className="flex items-center gap-2 rounded-xl bg-emerald-500/10 border border-emerald-500/20 px-4 py-3 text-xs text-emerald-400">
                  <Ic name="check" className="size-4 shrink-0" />
                  <span>{successMessage}</span>
                </div>
              )}

              {/* Section Tabs */}
              <div className="flex items-center gap-2 border-b border-border/40 pb-2">
                <button
                  type="button"
                  onClick={() => setActiveSection('base')}
                  className={`px-3 py-1.5 text-xs font-bold rounded-lg transition-colors ${
                    activeSection === 'base'
                      ? 'bg-primary/15 text-primary'
                      : 'text-grey-3 hover:text-foreground'
                  }`}
                >
                  اطلاعات کلی (عنوان و شرح)
                </button>
                <button
                  type="button"
                  onClick={() => setActiveSection('features')}
                  className={`px-3 py-1.5 text-xs font-bold rounded-lg transition-colors ${
                    activeSection === 'features'
                      ? 'bg-primary/15 text-primary'
                      : 'text-grey-3 hover:text-foreground'
                  }`}
                >
                  ویژگی‌های تور ({formFeatures.length})
                </button>
                <button
                  type="button"
                  onClick={() => setActiveSection('tips')}
                  className={`px-3 py-1.5 text-xs font-bold rounded-lg transition-colors ${
                    activeSection === 'tips'
                      ? 'bg-primary/15 text-primary'
                      : 'text-grey-3 hover:text-foreground'
                  }`}
                >
                  نکات و راهنمای سفر ({formTips.length})
                </button>
                <button
                  type="button"
                  onClick={() => setActiveSection('itinerary')}
                  className={`px-3 py-1.5 text-xs font-bold rounded-lg transition-colors ${
                    activeSection === 'itinerary'
                      ? 'bg-primary/15 text-primary'
                      : 'text-grey-3 hover:text-foreground'
                  }`}
                >
                  مراحل سفر ({itineraries.length})
                </button>
              </div>

              {/* Active Section Form */}
              <div dir={activeLangConfig?.dir || 'rtl'} className="space-y-4">
                {/* 1. Base Info */}
                {activeSection === 'base' && (
                  <div className="space-y-4">
                    <div>
                      <label className="block text-xs font-bold text-grey-2 mb-1.5">
                        عنوان تور به زبان {activeLangConfig?.label} ({selectedLang}):
                      </label>
                      <Input
                        value={formTitle}
                        onChange={(e) => setFormTitle(e.target.value)}
                        placeholder={`عنوان تور به زبان ${activeLangConfig?.label}...`}
                        className="bg-surface-2 border-border/50 text-sm"
                        disabled={isPrimary}
                      />
                      {isPrimary && (
                        <p className="text-[11px] text-amber-400/80 mt-1">
                          * این زبان، زبان اصلی تور است و از فرم اصلی مدیریت می‌شود.
                        </p>
                      )}
                    </div>

                    <div>
                      <label className="block text-xs font-bold text-grey-2 mb-1.5">
                        شرح و توضیحات تور:
                      </label>
                      <textarea
                        rows={4}
                        value={formDesc}
                        onChange={(e) => setFormDesc(e.target.value)}
                        placeholder={`توضیحات کامل تور به زبان ${activeLangConfig?.label}...`}
                        disabled={isPrimary}
                        className="w-full rounded-xl border border-border/50 bg-surface-2 px-3.5 py-2.5 text-sm text-foreground placeholder:text-grey-4 focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary disabled:opacity-60"
                      />
                    </div>
                  </div>
                )}

                {/* 2. Tour Features */}
                {activeSection === 'features' && (
                  <div className="space-y-3">
                    <div className="flex items-center gap-2">
                      <Input
                        value={newFeatureText}
                        onChange={(e) => setNewFeatureText(e.target.value)}
                        placeholder={`افزودن ویژگی جدید به ${activeLangConfig?.label}...`}
                        className="bg-surface-2 border-border/50 text-sm"
                        onKeyDown={(e) => {
                          if (e.key === 'Enter') {
                            e.preventDefault()
                            handleAddFeature()
                          }
                        }}
                      />
                      <Button
                        type="button"
                        size="sm"
                        onClick={handleAddFeature}
                        className="shrink-0 bg-primary/20 text-primary hover:bg-primary hover:text-white"
                      >
                        <Ic name="plus" className="size-4" />
                        <span>افزودن</span>
                      </Button>
                    </div>

                    <div className="space-y-2 mt-3">
                      {formFeatures.length === 0 ? (
                        <p className="text-xs text-grey-4 text-center py-6">
                          هنوز ویژگی برای این زبان اضافه نشده است.
                        </p>
                      ) : (
                        formFeatures.map((feat, idx) => (
                          <div
                            key={idx}
                            className="flex items-center justify-between gap-3 rounded-xl bg-surface-2 border border-border/40 px-3.5 py-2 text-xs"
                          >
                            <span className="font-medium text-foreground">{feat}</span>
                            <button
                              type="button"
                              onClick={() => handleRemoveFeature(idx)}
                              className="text-grey-4 hover:text-rose-400 p-1"
                            >
                              <Ic name="x" className="size-3.5" />
                            </button>
                          </div>
                        ))
                      )}
                    </div>
                  </div>
                )}

                {/* 3. Travel Tips */}
                {activeSection === 'tips' && (
                  <div className="space-y-3">
                    <div className="rounded-xl bg-surface-2/60 border border-border/40 p-3 space-y-2">
                      <Input
                        value={newTipTitle}
                        onChange={(e) => setNewTipTitle(e.target.value)}
                        placeholder="عنوان نکته (مثلاً: لباس مناسب / Walking Shoes)..."
                        className="bg-surface-2 text-xs"
                      />
                      <textarea
                        rows={2}
                        value={newTipDesc}
                        onChange={(e) => setNewTipDesc(e.target.value)}
                        placeholder="توضیح نکته سفر..."
                        className="w-full rounded-xl border border-border/50 bg-surface-2 px-3 py-2 text-xs text-foreground placeholder:text-grey-4 focus:border-primary focus:outline-none"
                      />
                      <Button
                        type="button"
                        size="sm"
                        onClick={handleAddTip}
                        className="w-full bg-primary/20 text-primary hover:bg-primary hover:text-white text-xs h-8"
                      >
                        <Ic name="plus" className="size-3.5" />
                        <span>افزودن نکته سفر</span>
                      </Button>
                    </div>

                    <div className="space-y-2 mt-3">
                      {formTips.length === 0 ? (
                        <p className="text-xs text-grey-4 text-center py-6">
                          هنوز نکته سفری برای این زبان ثبت نشده است.
                        </p>
                      ) : (
                        formTips.map((tip, idx) => (
                          <div
                            key={idx}
                            className="rounded-xl bg-surface-2 border border-border/40 p-3 text-xs space-y-1 relative"
                          >
                            <div className="flex items-center justify-between">
                              <span className="font-bold text-foreground">{tip.title}</span>
                              <button
                                type="button"
                                onClick={() => handleRemoveTip(idx)}
                                className="text-grey-4 hover:text-rose-400 p-0.5"
                              >
                                <Ic name="x" className="size-3.5" />
                              </button>
                            </div>
                            <p className="text-grey-3 leading-relaxed">{tip.desc}</p>
                          </div>
                        ))
                      )}
                    </div>
                  </div>
                )}

                {/* 4. Itinerary Steps Translations */}
                {activeSection === 'itinerary' && (
                  <div className="space-y-4">
                    {itineraries.length === 0 ? (
                      <p className="text-xs text-grey-4 text-center py-8">
                        هیچ مرحله سفری برای این تور ثبت نشده است.
                      </p>
                    ) : (
                      itineraries.map((it, idx) => {
                        const draft = itinDrafts[it.id] || { title: '', summary: '' }
                        return (
                          <div
                            key={it.id}
                            className="rounded-xl bg-surface-2 border border-border/40 p-3.5 space-y-2.5"
                          >
                            <div className="flex items-center justify-between text-xs">
                              <div className="flex items-center gap-2">
                                <span className="flex size-5 items-center justify-center rounded-full bg-primary/20 text-primary text-[10px] font-bold">
                                  {idx + 1}
                                </span>
                                <span className="font-bold text-foreground">
                                  عنوان اصلی: {it.title}
                                </span>
                              </div>
                              <span className="text-[10px] text-grey-3">شناسه #{it.id}</span>
                            </div>

                            <Input
                              value={draft.title}
                              onChange={(e) =>
                                handleItineraryDraftChange(it.id, 'title', e.target.value)
                              }
                              placeholder={`عنوان مرحله به ${activeLangConfig?.label}...`}
                              className="bg-surface-3 border-border/50 text-xs"
                            />

                            <textarea
                              rows={2}
                              value={draft.summary}
                              onChange={(e) =>
                                handleItineraryDraftChange(it.id, 'summary', e.target.value)
                              }
                              placeholder={`شرح مرحله به ${activeLangConfig?.label}...`}
                              className="w-full rounded-xl border border-border/50 bg-surface-3 px-3 py-2 text-xs text-foreground placeholder:text-grey-4 focus:border-primary focus:outline-none"
                            />
                          </div>
                        )
                      })
                    )}
                  </div>
                )}
              </div>
            </>
          )}
        </div>

        {/* Dialog Footer */}
        <DialogFooter className="px-6 py-4 bg-secondary/10 border-t border-border/50 flex items-center justify-between">
          <div className="text-xs text-grey-3">
            زبان در حال ویرایش: <span className="font-bold text-primary">{activeLangConfig?.label}</span>
          </div>

          <div className="flex items-center gap-2">
            <DialogClose asChild>
              <Button type="button" variant="outline" size="sm" className="rounded-xl">
                بستن
              </Button>
            </DialogClose>
            <Button
              type="button"
              size="sm"
              disabled={isPrimary || isLoading}
              isLoading={isSaving}
              loadingText="در حال ذخیره..."
              onClick={handleSave}
              className="rounded-xl bg-primary text-white hover:bg-primary/90 gap-1.5 shadow-sm"
            >
              <Ic name="check" className="size-3.5" />
              <span>ذخیره ترجمه {activeLangConfig?.label}</span>
            </Button>
          </div>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  )
}