'use client'

import { motion } from 'motion/react'
import { Loader2 } from 'lucide-react'
import {
  ArrowRight, GitBranch, Lightbulb, Link2, BookOpen, Inbox,
  GraduationCap, Compass, Plus, Sparkles, PenLine,
} from 'lucide-react'
import type { LucideIcon } from 'lucide-react'
import { useLanguage } from '@/lib/i18n'
import { DashboardWidgetTitleRow } from '@/components/dashboard-widget-title-row'
import type { DashboardPath, DashboardPathType } from '@/lib/dashboard/path-types'

const TYPE_META: Record<DashboardPathType, { Icon: LucideIcon; accent: string }> = {
  continue: { Icon: PenLine, accent: 'text-ink' },
  connect: { Icon: Link2, accent: 'text-brand-accent' },
  'add-link': { Icon: Plus, accent: 'text-emerald-600' },
  bridge: { Icon: GitBranch, accent: 'text-violet-600' },
  research: { Icon: Sparkles, accent: 'text-sky-600' },
  explore: { Icon: Compass, accent: 'text-amber-600' },
  organize: { Icon: Inbox, accent: 'text-brand-accent' },
  review: { Icon: GraduationCap, accent: 'text-brand-accent' },
  resurface: { Icon: Lightbulb, accent: 'text-brand-accent' },
  daily: { Icon: BookOpen, accent: 'text-concrete' },
}

export interface DashboardNextPathsProps {
  paths: DashboardPath[]
  loading?: boolean
  enriching?: boolean
  focusNoteTitle?: string | null
  onAction: (path: DashboardPath) => void
  prefersReducedMotion?: boolean
}

export function DashboardNextPaths({
  paths,
  loading,
  enriching,
  focusNoteTitle,
  onAction,
  prefersReducedMotion,
}: DashboardNextPathsProps) {
  const { t } = useLanguage()

  if (loading) {
    return (
      <div className="rounded-2xl border border-brand-accent/20 bg-gradient-to-br from-white via-white to-brand-accent/[0.04] dark:from-zinc-900 dark:via-zinc-900 dark:to-brand-accent/[0.06] shadow-sm overflow-hidden">
        <div className="px-5 pt-4 pb-3 border-b border-border/15">
          <DashboardWidgetTitleRow
            widgetId="next-paths"
            title={t('homeDashboard.pathsTitle')}
            className="mb-0"
          />
          {focusNoteTitle && (
            <p className="text-[11px] text-concrete mt-1">
              {t('homeDashboard.pathsFromNote', { title: focusNoteTitle })}
            </p>
          )}
        </div>
        <div className="flex flex-col items-center justify-center gap-3 px-5 py-10">
          <Loader2 size={22} className="text-brand-accent animate-spin" strokeWidth={2} />
          <p className="text-[11px] text-concrete text-center leading-relaxed max-w-[240px]">
            {t('homeDashboard.pathsLoading')}
          </p>
        </div>
      </div>
    )
  }

  if (paths.length === 0) {
    return (
      <div className="rounded-2xl border border-border/25 bg-white/60 dark:bg-zinc-900/60 p-5">
        <DashboardWidgetTitleRow
          widgetId="next-paths"
          title={t('homeDashboard.pathsTitle')}
          className="mb-2"
        />
        <p className="text-[10px] text-concrete italic">{t('homeDashboard.pathsEmpty')}</p>
      </div>
    )
  }

  const hero = paths[0]
  const rest = paths.slice(1, 5)
  const HeroIcon = TYPE_META[hero.type].Icon

  return (
    <div className="rounded-2xl border border-brand-accent/20 bg-gradient-to-br from-white via-white to-brand-accent/[0.04] dark:from-zinc-900 dark:via-zinc-900 dark:to-brand-accent/[0.06] shadow-sm overflow-hidden">
      <div className="px-5 pt-4 pb-3 border-b border-border/15">
        <DashboardWidgetTitleRow
          widgetId="next-paths"
          title={t('homeDashboard.pathsTitle')}
          className="mb-0"
          actions={enriching ? (
            <span className="inline-flex items-center gap-1.5 text-[8px] font-mono uppercase text-concrete">
              <Loader2 size={10} className="text-brand-accent animate-spin" />
              {t('homeDashboard.pathsEnriching')}
            </span>
          ) : undefined}
        />
        {focusNoteTitle && (
          <p className="text-[11px] text-concrete mt-1">
            {t('homeDashboard.pathsFromNote', { title: focusNoteTitle })}
          </p>
        )}
      </div>

      <motion.button
        type="button"
        onClick={() => onAction(hero)}
        whileHover={prefersReducedMotion ? undefined : { y: -1 }}
        className="w-full text-start px-5 py-4 hover:bg-brand-accent/[0.03] transition-colors border-b border-border/10"
      >
        <div className="flex items-start gap-3">
          <div className={`w-9 h-9 rounded-xl bg-brand-accent/10 flex items-center justify-center shrink-0 ${TYPE_META[hero.type].accent}`}>
            <HeroIcon size={16} strokeWidth={1.75} />
          </div>
          <div className="min-w-0 flex-1">
            <p className="text-[8px] font-mono font-bold uppercase tracking-wider text-concrete mb-0.5">
              {t(`homeDashboard.pathTypes.${hero.type}`)}
              {hero.score ? ` · ${hero.score}%` : ''}
            </p>
            <p className="text-sm font-serif font-semibold text-ink dark:text-dark-ink leading-snug">
              {hero.title}
            </p>
            <p className="text-[11px] text-concrete leading-relaxed mt-1 line-clamp-2">
              {hero.description}
            </p>
          </div>
          <span className="shrink-0 inline-flex items-center gap-1 text-[9px] font-mono font-bold uppercase text-brand-accent mt-1">
            {t(`homeDashboard.pathActions.${hero.actionKey}`)}
            <ArrowRight size={10} />
          </span>
        </div>
      </motion.button>

      {rest.length > 0 && (
        <div className="divide-y divide-border/10">
          {rest.map(path => {
            const meta = TYPE_META[path.type]
            const Icon = meta.Icon
            return (
              <button
                key={path.id}
                type="button"
                onClick={() => onAction(path)}
                className="w-full flex items-center gap-3 px-5 py-3 text-start hover:bg-stone-50/80 dark:hover:bg-zinc-950/40 transition-colors"
              >
                <Icon size={13} className={`shrink-0 ${meta.accent}`} />
                <div className="min-w-0 flex-1">
                  <p className="text-[11px] font-medium text-ink dark:text-dark-ink truncate">{path.title}</p>
                  <p className="text-[9px] text-concrete truncate">{path.description}</p>
                </div>
                <span className="text-[8px] font-mono uppercase text-brand-accent shrink-0">
                  {t(`homeDashboard.pathActions.${path.actionKey}`)}
                </span>
              </button>
            )
          })}
        </div>
      )}
    </div>
  )
}