'use client'

import { useState, useEffect } from 'react'
import { Button, Select, Toggle, toast, Spinner } from '@ciphera-net/ui'
import { useSite, useSubscription, usePageSpeedConfig } from '@/lib/swr/dashboard'
import { updateSite } from '@/lib/api/sites'
import { updatePageSpeedConfig } from '@/lib/api/pagespeed'
import { getRetentionOptionsForPlan, formatRetentionMonths } from '@/lib/plans'
import { generatePrivacySnippet } from '@/lib/utils/privacySnippet'
import { Copy, CheckCircle } from '@phosphor-icons/react'
import Link from 'next/link'

const GEO_OPTIONS = [
  { value: 'full', label: 'Full (country, region, city)' },
  { value: 'country', label: 'Country only' },
  { value: 'none', label: 'Disabled' },
]

export default function SitePrivacyTab({ siteId }: { siteId: string }) {
  const { data: site, mutate } = useSite(siteId)
  const { data: subscription, error: subscriptionError, mutate: mutateSubscription } = useSubscription()
  const { data: psiConfig, mutate: mutatePSIConfig } = usePageSpeedConfig(siteId)
  const [collectPagePaths, setCollectPagePaths] = useState(true)
  const [collectReferrers, setCollectReferrers] = useState(true)
  const [collectDeviceInfo, setCollectDeviceInfo] = useState(true)
  const [collectScreenRes, setCollectScreenRes] = useState(true)
  const [collectGeoData, setCollectGeoData] = useState('full')
  const [hideUnknownLocations, setHideUnknownLocations] = useState(false)
  const [dataRetention, setDataRetention] = useState(6)
  const [excludedPaths, setExcludedPaths] = useState('')
  const [snippetCopied, setSnippetCopied] = useState(false)
  const [saving, setSaving] = useState(false)

  useEffect(() => {
    if (site) {
      setCollectPagePaths(site.collect_page_paths ?? true)
      setCollectReferrers(site.collect_referrers ?? true)
      setCollectDeviceInfo(site.collect_device_info ?? true)
      setCollectScreenRes(site.collect_screen_resolution ?? true)
      setCollectGeoData(site.collect_geo_data ?? 'full')
      setHideUnknownLocations(site.hide_unknown_locations ?? false)
      setDataRetention(site.data_retention_months ?? 6)
      setExcludedPaths((site.excluded_paths || []).join('\n'))
    }
  }, [site])

  const handleSave = async () => {
    setSaving(true)
    try {
      await updateSite(siteId, {
        name: site?.name || '',
        collect_page_paths: collectPagePaths,
        collect_referrers: collectReferrers,
        collect_device_info: collectDeviceInfo,
        collect_screen_resolution: collectScreenRes,
        collect_geo_data: collectGeoData as 'full' | 'country' | 'none',
        hide_unknown_locations: hideUnknownLocations,
        data_retention_months: dataRetention,
        excluded_paths: excludedPaths.split('\n').map(p => p.trim()).filter(Boolean),
      })
      await mutate()
      toast.success('Privacy settings updated')
    } catch {
      toast.error('Failed to save')
    } finally {
      setSaving(false)
    }
  }

  if (!site) return <div className="flex items-center justify-center py-12"><Spinner className="w-6 h-6 text-neutral-500" /></div>

  return (
    <div className="space-y-6">
      <div>
        <h3 className="text-base font-semibold text-white mb-1">Data & Privacy</h3>
        <p className="text-sm text-neutral-400">Control what data is collected from your visitors.</p>
      </div>

      <div className="space-y-1">
        {[
          { label: 'Page paths', desc: 'Track which pages visitors view.', checked: collectPagePaths, onChange: setCollectPagePaths },
          { label: 'Referrers', desc: 'Track where visitors come from.', checked: collectReferrers, onChange: setCollectReferrers },
          { label: 'Device info', desc: 'Track browser, OS, and device type.', checked: collectDeviceInfo, onChange: setCollectDeviceInfo },
          { label: 'Screen resolution', desc: 'Track visitor screen dimensions.', checked: collectScreenRes, onChange: setCollectScreenRes },
          { label: 'Hide unknown locations', desc: 'Exclude "Unknown" from location stats.', checked: hideUnknownLocations, onChange: setHideUnknownLocations },
        ].map(item => (
          <div key={item.label} className="flex items-center justify-between py-3 px-4 rounded-xl hover:bg-neutral-800/20 transition-colors">
            <div>
              <p className="text-sm font-medium text-white">{item.label}</p>
              <p className="text-xs text-neutral-400">{item.desc}</p>
            </div>
            <Toggle checked={item.checked} onChange={() => item.onChange((p: boolean) => !p)} />
          </div>
        ))}
      </div>

      <div>
        <label className="block text-sm font-medium text-neutral-300 mb-1.5">Geographic data</label>
        <Select
          value={collectGeoData}
          onChange={setCollectGeoData}
          variant="input"
          options={GEO_OPTIONS}
        />
        <p className="text-xs text-neutral-500 mt-1">Controls location granularity. "Disabled" collects no geographic data at all.</p>
      </div>

      {/* Data Retention */}
      <div className="space-y-3 pt-6 border-t border-neutral-800">
        <h4 className="text-sm font-medium text-neutral-300">Data Retention</h4>

        {subscriptionError && (
          <div className="p-3 rounded-xl border border-amber-800 bg-amber-900/20 flex items-center justify-between">
            <p className="text-xs text-amber-200">Plan limits could not be loaded.</p>
            <button onClick={() => mutateSubscription()} className="text-xs font-medium text-amber-400 hover:text-amber-300">Retry</button>
          </div>
        )}

        <div className="p-4 bg-neutral-900/50 rounded-xl border border-neutral-800">
          <div className="flex items-center justify-between">
            <div>
              <p className="font-medium text-white text-sm">Keep raw event data for</p>
              <p className="text-xs text-neutral-400 mt-0.5">Events older than this are automatically deleted. Aggregated daily stats are kept permanently.</p>
            </div>
            <Select
              value={String(dataRetention)}
              onChange={(v) => setDataRetention(Number(v))}
              options={getRetentionOptionsForPlan(subscription?.plan_id).map(o => ({ value: String(o.value), label: o.label }))}
              variant="input"
              className="min-w-[160px]"
            />
          </div>
          {subscription && (
            <p className="text-xs text-neutral-500 mt-2">
              Your {subscription.plan_id?.includes('pro') ? 'Pro' : 'Free'} plan supports up to {formatRetentionMonths(Math.max(...getRetentionOptionsForPlan(subscription.plan_id).map(o => o.value)))} of data retention.
            </p>
          )}
          {(!subscription || subscription.plan_id?.includes('free')) && (
            <p className="text-xs text-neutral-500 mt-2">
              <Link href="/pricing" className="text-brand-orange hover:underline">Upgrade</Link> for longer retention.
            </p>
          )}
        </div>
      </div>

      {/* Path Filtering */}
      <div className="space-y-3 pt-6 border-t border-neutral-800">
        <h4 className="text-sm font-medium text-neutral-300">Path Filtering</h4>
        <div>
          <label className="block text-sm font-medium text-neutral-300 mb-1.5">Excluded Paths</label>
          <textarea
            value={excludedPaths}
            onChange={e => setExcludedPaths(e.target.value)}
            rows={4}
            placeholder={"/admin/*\n/staging/*"}
            className="w-full px-4 py-3 border border-neutral-800 rounded-lg bg-neutral-900/50 text-white font-mono text-sm focus:border-brand-orange focus:ring-4 focus:ring-brand-orange/10 outline-none transition-all"
          />
          <p className="text-xs text-neutral-500 mt-1">Enter paths to exclude from tracking (one per line). Supports wildcards (e.g., /admin/*).</p>
        </div>
      </div>

      {/* PageSpeed Monitoring */}
      <div className="space-y-3 pt-6 border-t border-neutral-800">
        <h4 className="text-sm font-medium text-neutral-300">PageSpeed Monitoring</h4>
        <div className="p-4 bg-neutral-900/50 rounded-xl border border-neutral-800">
          <div className="flex items-center justify-between">
            <div>
              <p className="font-medium text-white text-sm">Check frequency</p>
              <p className="text-xs text-neutral-400 mt-0.5">How often PageSpeed Insights runs automated checks.</p>
            </div>
            {psiConfig?.enabled ? (
              <Select
                value={psiConfig.frequency || 'weekly'}
                onChange={async (v) => {
                  try {
                    await updatePageSpeedConfig(siteId, { enabled: psiConfig.enabled, frequency: v })
                    mutatePSIConfig()
                    toast.success('Check frequency updated')
                  } catch {
                    toast.error('Failed to update')
                  }
                }}
                options={[
                  { value: 'daily', label: 'Daily' },
                  { value: 'weekly', label: 'Weekly' },
                  { value: 'monthly', label: 'Monthly' },
                ]}
                variant="input"
                className="min-w-[140px]"
              />
            ) : (
              <span className="text-sm text-neutral-400">Not enabled</span>
            )}
          </div>
        </div>
      </div>

      {/* Privacy Policy */}
      <div className="space-y-3 pt-6 border-t border-neutral-800">
        <h4 className="text-sm font-medium text-neutral-300">For your privacy policy</h4>
        <p className="text-xs text-neutral-400">Copy the text below into your Privacy Policy. It updates automatically based on your saved settings.</p>
        <p className="text-xs text-amber-600">This is provided for convenience and is not legal advice. Consult a lawyer for compliance requirements.</p>
        <div className="relative">
          <textarea
            readOnly
            rows={6}
            value={generatePrivacySnippet(site)}
            className="w-full px-4 py-3 pr-12 border border-neutral-800 rounded-xl bg-neutral-900/50 text-neutral-300 text-xs font-mono"
          />
          <button
            type="button"
            onClick={() => {
              navigator.clipboard.writeText(generatePrivacySnippet(site))
              setSnippetCopied(true)
              toast.success('Privacy snippet copied')
              setTimeout(() => setSnippetCopied(false), 2000)
            }}
            className="absolute top-3 right-3 p-2 rounded-lg bg-neutral-700 hover:bg-neutral-600 text-neutral-300 transition-colors"
          >
            {snippetCopied ? <CheckCircle weight="bold" className="w-4 h-4" /> : <Copy weight="bold" className="w-4 h-4" />}
          </button>
        </div>
      </div>

      <div className="flex justify-end pt-2">
        <Button onClick={handleSave} variant="primary" disabled={saving}>
          {saving ? 'Saving...' : 'Save Changes'}
        </Button>
      </div>
    </div>
  )
}