'use client'

import { useState, useEffect } from 'react'
import { useRouter } from 'next/navigation'
import { FileUpload } from '@/components/incidents/file-upload'
import type { IncidentType, MedicalStatus } from '@/lib/incidents/validate'
import { useTranslations } from '@/lib/i18n/context'

interface Props {
  zoneToken: string | null
  zoneName: string | null
  siteName: string | null
  trucks: Array<{ id: string; truck_no: string; carrier: string | null }>
  initialTruckId?: string | null
}

export function ReportForm({ zoneToken, trucks, initialTruckId }: Props) {
  const router = useRouter()
  const t = useTranslations('ReportForm')
  const itLabels = useTranslations('IncidentType')
  const msLabels = useTranslations('MedicalStatus')
  const tdLabels = useTranslations('TypeDetails')

  const INCIDENT_TYPE_OPTIONS: [IncidentType, string][] = [
    ['injury', itLabels.injury],
    ['near_miss', itLabels.near_miss],
    ['hazard', itLabels.hazard],
    ['asset_damage', itLabels.asset_damage],
    ['environmental', itLabels.environmental],
    ['security', itLabels.security],
    ['fire', itLabels.fire],
    ['transport', itLabels.transport],
  ]

  const MEDICAL_STATUS_OPTIONS: [MedicalStatus, string][] = [
    ['none', msLabels.none],
    ['first_aid', msLabels.first_aid],
    ['medical_treatment', msLabels.medical_treatment],
    ['lti', msLabels.lti],
  ]

  const [submitting, setSubmitting] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [files, setFiles] = useState<File[]>([])
  const [isOnline, setIsOnline] = useState(true)
  const [savedOffline, setSavedOffline] = useState(false)
  const [qualityCheck, setQualityCheck] = useState<{
    score: number
    passes: boolean
    feedback: string
    suggestions: string[]
  } | null>(null)
  const [overrideQuality, setOverrideQuality] = useState(false)

  const [form, setForm] = useState({
    incident_type: (initialTruckId ? 'transport' : '') as IncidentType | '',
    description: '',
    injury_involved: false,
    medical_status: '' as MedicalStatus | '',
    asset_involved: false,
    truck_id: initialTruckId ?? '',
  })
  const [typeDetails, setTypeDetails] = useState<Record<string, string | boolean>>({})

  const setDetail = (key: string, value: string | boolean) =>
    setTypeDetails(d => ({ ...d, [key]: value }))

  const detailText = (key: string, label: string, placeholder = '') => (
    <div>
      <label className="block text-sm font-medium text-gray-700 mb-1">{label}</label>
      <input
        type="text"
        value={(typeDetails[key] as string) ?? ''}
        onChange={e => setDetail(key, e.target.value)}
        placeholder={placeholder}
        className="w-full border border-gray-300 rounded-lg px-3 py-2.5 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
      />
    </div>
  )

  const detailCheckbox = (key: string, label: string) => (
    <label className="flex items-center gap-3 cursor-pointer">
      <input
        type="checkbox"
        className="w-4 h-4 text-blue-600"
        checked={Boolean(typeDetails[key])}
        onChange={e => setDetail(key, e.target.checked)}
      />
      <span className="text-sm font-medium text-gray-700">{label}</span>
    </label>
  )

  useEffect(() => {
    // eslint-disable-next-line react-hooks/set-state-in-effect
    setIsOnline(navigator.onLine)
    const onOnline = () => setIsOnline(true)
    const onOffline = () => setIsOnline(false)
    window.addEventListener('online', onOnline)
    window.addEventListener('offline', onOffline)
    return () => {
      window.removeEventListener('online', onOnline)
      window.removeEventListener('offline', onOffline)
    }
  }, [])

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    setError(null)
    setSubmitting(true)

    // Offline path — save to IndexedDB
    if (!isOnline) {
      try {
        const { addPendingReport } = await import('@/lib/offline/db')
        await addPendingReport({
          zone_token: zoneToken ?? '',
          incident_type: form.incident_type as IncidentType,
          description: form.description,
          injury_involved: form.injury_involved,
          asset_involved: form.asset_involved,
          medical_status: form.medical_status || undefined,
          type_details: Object.keys(typeDetails).length > 0 ? typeDetails : undefined,
          truck_id: form.truck_id || undefined,
          created_at: new Date().toISOString(),
        })
        setSavedOffline(true)
      } catch (err) {
        console.error('Offline save error:', err)
        setError(t.errorGeneric)
      }
      setSubmitting(false)
      return
    }

    if (!overrideQuality) {
      try {
        const qcRes = await fetch('/ims/api/incidents/ai/quality-check', {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({
            description: form.description,
            incident_type: form.incident_type,
          }),
        })
        if (qcRes.ok) {
          const qc = await qcRes.json() as {
            score: number
            passes: boolean
            feedback: string
            suggestions: string[]
          }
          setQualityCheck(qc)
          if (!qc.passes) {
            setSubmitting(false)
            return
          }
        }
      } catch {
        // Quality check failure is non-blocking
      }
    }

    try {
      const fd = new FormData()
      if (zoneToken) fd.append('zone_token', zoneToken)
      fd.append('incident_type', form.incident_type)
      fd.append('description', form.description)
      fd.append('injury_involved', String(form.injury_involved))
      fd.append('asset_involved', String(form.asset_involved))
      if (form.injury_involved && form.medical_status) {
        fd.append('medical_status', form.medical_status)
      }
      if (Object.keys(typeDetails).length > 0) {
        fd.append('type_details', JSON.stringify(typeDetails))
      }
      if (form.truck_id) fd.append('truck_id', form.truck_id)
      files.forEach(f => fd.append('files', f))

      const res = await fetch('/ims/api/incidents', { method: 'POST', body: fd })

      // Parse JSON separately so a non-JSON response (HTML error page) surfaces the status code
      let data: Record<string, unknown> = {}
      try {
        data = await res.json()
      } catch {
        console.error('Non-JSON response from /api/incidents', res.status, res.statusText)
        setError(`${t.errorGeneric} (HTTP ${res.status})`)
        return
      }

      if (!res.ok) {
        const msg = Array.isArray(data.details) ? (data.details as string[]).join('. ') : (data.error as string)
        setError(msg ?? t.errorGeneric)
        return
      }

      router.push(`/report/success?ref=${data.reference_no}`)
    } catch (err) {
      console.error('Submit error:', err)
      setError(t.errorGeneric)
    } finally {
      setSubmitting(false)
    }
  }

  if (savedOffline) {
    return (
      <div className="bg-green-50 border border-green-200 rounded-xl p-5 text-sm text-green-700">
        {t.savedOffline}
      </div>
    )
  }

  return (
    <form onSubmit={handleSubmit} className="space-y-5 bg-white rounded-xl shadow-sm p-5">
      {!isOnline && (
        <div className="bg-yellow-50 border border-yellow-200 rounded p-3 text-sm text-yellow-700">
          {t.offlineBanner}
        </div>
      )}

      {error && (
        <div className="bg-red-50 border border-red-200 rounded p-3 text-sm text-red-700">
          {error}
        </div>
      )}

      <div>
        <label className="block text-sm font-medium text-gray-700 mb-1">
          {t.incidentTypeLabel} <span className="text-red-500">*</span>
        </label>
        <select
          required
          className="w-full border border-gray-300 rounded-lg px-3 py-2.5 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
          value={form.incident_type}
          onChange={e => {
            setForm(f => ({ ...f, incident_type: e.target.value as IncidentType, truck_id: '' }))
            setTypeDetails({})
          }}
        >
          <option value="">{t.incidentTypePlaceholder}</option>
          {INCIDENT_TYPE_OPTIONS.map(([v, l]) => (
            <option key={v} value={v}>{l}</option>
          ))}
        </select>
      </div>

      {form.incident_type === 'environmental' && (
        <div className="space-y-3 border border-gray-200 rounded-lg p-3">
          {detailText('substance', tdLabels.substance, tdLabels.substancePlaceholder)}
          {detailText('estimated_volume', tdLabels.estimatedVolume, tdLabels.estimatedVolumePlaceholder)}
          {detailCheckbox('containment_deployed', tdLabels.containmentDeployed)}
        </div>
      )}
      {form.incident_type === 'asset_damage' && (
        <div className="space-y-3 border border-gray-200 rounded-lg p-3">
          {detailText('equipment_id', tdLabels.equipmentId, tdLabels.equipmentIdPlaceholder)}
          {detailCheckbox('loto_applied', tdLabels.lotoApplied)}
        </div>
      )}
      {form.incident_type === 'security' && (
        <div className="space-y-3 border border-gray-200 rounded-lg p-3">
          {detailText('persons_involved', tdLabels.personsInvolved, tdLabels.personsInvolvedPlaceholder)}
          {detailCheckbox('police_reported', tdLabels.policeReported)}
        </div>
      )}
      {form.incident_type === 'fire' && (
        <div className="space-y-3 border border-gray-200 rounded-lg p-3">
          {detailCheckbox('alarm_raised', tdLabels.alarmRaised)}
          {detailCheckbox('fire_brigade_called', tdLabels.fireBrigadeCalled)}
        </div>
      )}

      {form.incident_type === 'transport' && (
        <div>
          <label className="block text-sm font-medium text-gray-700 mb-1">
            {t.truckLabel} <span className="text-red-500">*</span>
          </label>
          <select
            required
            className="w-full border border-gray-300 rounded-lg px-3 py-2.5 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
            value={form.truck_id}
            onChange={e => setForm(f => ({ ...f, truck_id: e.target.value }))}
          >
            <option value="">{t.truckPlaceholder}</option>
            {trucks.map(tk => (
              <option key={tk.id} value={tk.id}>
                {tk.truck_no}{tk.carrier ? ` — ${tk.carrier}` : ''}
              </option>
            ))}
          </select>
        </div>
      )}

      <div>
        <label className="block text-sm font-medium text-gray-700 mb-1">
          {t.descriptionLabel} <span className="text-red-500">*</span>
        </label>
        <textarea
          required
          minLength={10}
          rows={4}
          placeholder={t.descriptionPlaceholder}
          className="w-full border border-gray-300 rounded-lg px-3 py-2.5 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 resize-none"
          value={form.description}
          onChange={e => setForm(f => ({ ...f, description: e.target.value }))}
        />
      </div>

      {qualityCheck && !qualityCheck.passes && (
        <div className="rounded-lg bg-amber-50 border border-amber-200 p-3 space-y-2">
          <p className="text-xs font-semibold text-amber-700 uppercase tracking-wide">
            {t.qualityScoreLabel.replace('{score}', String(qualityCheck.score))}
          </p>
          <p className="text-sm text-amber-800">{qualityCheck.feedback}</p>
          {qualityCheck.suggestions.length > 0 && (
            <ul className="list-disc list-inside space-y-1">
              {qualityCheck.suggestions.map((s, i) => (
                <li key={i} className="text-xs text-amber-700">{s}</li>
              ))}
            </ul>
          )}
          <label className="flex items-center gap-2 text-xs text-amber-700 cursor-pointer mt-1">
            <input
              type="checkbox"
              checked={overrideQuality}
              onChange={e => setOverrideQuality(e.target.checked)}
              className="rounded border-amber-300 text-amber-600"
            />
            {t.submitAnyway}
          </label>
        </div>
      )}

      <div className="space-y-3">
        <label className="flex items-center gap-3 cursor-pointer">
          <input
            type="checkbox"
            className="w-4 h-4 text-blue-600"
            checked={form.injury_involved}
            onChange={e => setForm(f => ({ ...f, injury_involved: e.target.checked, medical_status: '' }))}
          />
          <span className="text-sm font-medium text-gray-700">{t.injuryInvolved}</span>
        </label>

        {form.injury_involved && (
          <div className="ml-7">
            <label className="block text-sm font-medium text-gray-700 mb-1">
              {t.treatmentLevel} <span className="text-red-500">*</span>
            </label>
            <select
              required={form.injury_involved}
              className="w-full border border-gray-300 rounded-lg px-3 py-2.5 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500"
              value={form.medical_status}
              onChange={e => setForm(f => ({ ...f, medical_status: e.target.value as MedicalStatus }))}
            >
              <option value="">{t.treatmentPlaceholder}</option>
              {MEDICAL_STATUS_OPTIONS.map(([v, l]) => (
                <option key={v} value={v}>{l}</option>
              ))}
            </select>
          </div>
        )}

        <label className="flex items-center gap-3 cursor-pointer">
          <input
            type="checkbox"
            className="w-4 h-4 text-blue-600"
            checked={form.asset_involved}
            onChange={e => setForm(f => ({ ...f, asset_involved: e.target.checked }))}
          />
          <span className="text-sm font-medium text-gray-700">{t.assetInvolved}</span>
        </label>
      </div>

      <div>
        <label className="block text-sm font-medium text-gray-700 mb-2">
          {t.filesLabel}
        </label>
        <FileUpload onFilesChange={setFiles} disabled={submitting} />
      </div>

      <button
        type="submit"
        disabled={submitting || !form.incident_type || (form.incident_type === 'transport' && !form.truck_id)}
        className="w-full bg-blue-600 text-white py-3 rounded-lg font-medium text-sm
          hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
      >
        {submitting ? t.submitting : t.submitButton}
      </button>
    </form>
  )
}