import React, { useEffect, useState } from 'react'
import { Head, Link, router, usePage } from '@inertiajs/react'
import AdminLayout from '../../../Layouts/AdminLayout'

const PROMPT_VIEW_STORAGE_KEY = 'skinbase.admin.academy.prompts.view'
const PROMPT_VIEW_OPTIONS = [
  { value: 'gallery', label: 'Gallery', icon: 'fa-images' },
  { value: 'grid', label: 'Grid', icon: 'fa-grid-2' },
  { value: 'table', label: 'Table', icon: 'fa-table-list' },
]

function formatDateLabel(value) {
  if (!value) return 'Recently updated'

  const date = new Date(value)

  if (Number.isNaN(date.getTime())) return 'Recently updated'

  return new Intl.DateTimeFormat('en-GB', { day: 'numeric', month: 'short', year: 'numeric' }).format(date)
}

function paginationLabel(label) {
  return String(label || '')
    .replace(/&laquo;/g, 'Previous')
    .replace(/&raquo;/g, 'Next')
    .replace(/<[^>]+>/g, '')
    .trim()
}

function promptSummary(items = []) {
  return items.reduce((summary, item) => ({
    total: summary.total + 1,
    active: summary.active + (item.active ? 1 : 0),
    featured: summary.featured + (item.featured ? 1 : 0),
    promptOfWeek: summary.promptOfWeek + (item.prompt_of_week ? 1 : 0),
    comparisons: summary.comparisons + Number(item.comparisons_count || 0),
  }), { total: 0, active: 0, featured: 0, promptOfWeek: 0, comparisons: 0 })
}

function PromptFlag({ children, tone = 'default' }) {
  const toneClass = tone === 'warm'
    ? 'border-[#ffcfbf]/20 bg-[#ffcfbf]/10 text-[#fff0ea]'
    : tone === 'sky'
      ? 'border-sky-300/20 bg-sky-300/10 text-sky-100'
      : tone === 'emerald'
        ? 'border-emerald-300/20 bg-emerald-300/10 text-emerald-100'
        : 'border-white/10 bg-white/[0.05] text-slate-200'

  return <span className={`rounded-full border px-3 py-1 text-[11px] font-semibold uppercase tracking-[0.18em] ${toneClass}`}>{children}</span>
}

function PromptActions({ item }) {
  return (
    <div className="flex flex-wrap gap-3">
      {item.preview_url ? <Link href={item.preview_url} className="rounded-full border border-[#ffcfbf]/20 bg-[#ffcfbf]/10 px-4 py-2 text-sm font-semibold text-[#fff0ea]">Preview</Link> : null}
      <Link href={item.edit_url} className="rounded-full border border-white/10 bg-white/[0.04] px-4 py-2 text-sm font-semibold text-white">Edit</Link>
      <button type="button" onClick={() => { if (!window.confirm('Delete this prompt?')) return; router.delete(item.destroy_url, { preserveScroll: true }) }} className="rounded-full border border-rose-300/20 bg-rose-300/10 px-4 py-2 text-sm font-semibold text-rose-100">Delete</button>
    </div>
  )
}

function PromptPreview({ item, compact = false }) {
  if (item.preview_image_url) {
    return <img src={item.preview_image_url} alt={item.title} className={`h-full w-full object-cover transition duration-500 ${compact ? 'group-hover:scale-[1.04]' : 'group-hover:scale-[1.03]'}`} />
  }

  return (
    <div className="flex h-full items-center justify-center bg-[radial-gradient(circle_at_top_left,rgba(56,189,248,0.18),transparent_30%),linear-gradient(135deg,rgba(15,23,42,0.98),rgba(30,41,59,0.94))] p-6 text-center text-slate-300">
      <div>
        <p className="text-[10px] font-semibold uppercase tracking-[0.2em] text-slate-500">Prompt preview</p>
        <p className="mt-3 text-sm font-semibold text-white">No image attached yet</p>
      </div>
    </div>
  )
}

function PromptMeta({ item }) {
  return (
    <div className="flex flex-wrap gap-2">
      {item.category_name ? <PromptFlag tone="warm">{item.category_name}</PromptFlag> : null}
      {item.difficulty ? <PromptFlag>{item.difficulty}</PromptFlag> : null}
      {item.access_level ? <PromptFlag>{item.access_level}</PromptFlag> : null}
      {item.aspect_ratio ? <PromptFlag>{item.aspect_ratio}</PromptFlag> : null}
      {item.featured ? <PromptFlag tone="sky">Featured</PromptFlag> : null}
      {item.prompt_of_week ? <PromptFlag tone="emerald">Prompt of week</PromptFlag> : null}
      <PromptFlag tone={item.active ? 'sky' : 'default'}>{item.active ? 'Active' : 'Draft'}</PromptFlag>
    </div>
  )
}

function PromptGalleryCard({ item }) {
  return (
    <article className="group overflow-hidden rounded-[30px] border border-white/[0.08] bg-[linear-gradient(135deg,rgba(8,15,28,0.98),rgba(15,23,42,0.92))] shadow-[0_24px_80px_rgba(2,6,23,0.24)]">
      <div className="grid gap-0 xl:grid-cols-[340px_minmax(0,1fr)]">
        <div className="relative min-h-[250px] overflow-hidden border-b border-white/10 xl:min-h-full xl:border-b-0 xl:border-r xl:border-white/10">
          <PromptPreview item={item} />
          <div className="absolute inset-0 bg-[linear-gradient(180deg,rgba(2,6,23,0.04),rgba(2,6,23,0.32))]" />
          <div className="absolute left-4 top-4 flex flex-wrap gap-2">
            <PromptFlag tone="warm">{item.comparisons_count || 0} comparisons</PromptFlag>
            {item.slug ? <PromptFlag>{item.slug}</PromptFlag> : null}
          </div>
        </div>

        <div className="flex h-full flex-col justify-between p-6 lg:p-7">
          <div>
            <PromptMeta item={item} />
            <h2 className="mt-4 text-2xl font-semibold tracking-[-0.04em] text-white">{item.title}</h2>
            <p className="mt-3 max-w-3xl text-sm leading-7 text-slate-300">{item.excerpt || 'Add an excerpt to make this prompt easier to scan in moderation.'}</p>

            {item.tags?.length ? (
              <div className="mt-5 flex flex-wrap gap-2">
                {item.tags.slice(0, 5).map((tag) => (
                  <span key={tag} className="rounded-full border border-white/10 bg-black/20 px-3 py-1 text-xs font-semibold uppercase tracking-[0.18em] text-slate-300">{tag}</span>
                ))}
              </div>
            ) : null}
          </div>

          <div className="mt-6 flex flex-wrap items-center justify-between gap-4 border-t border-white/10 pt-5">
            <div className="grid gap-3 sm:grid-cols-3">
              <div>
                <p className="text-[10px] font-semibold uppercase tracking-[0.2em] text-slate-500">Updated</p>
                <p className="mt-1 text-sm font-semibold text-white">{formatDateLabel(item.updated_at)}</p>
              </div>
              <div>
                <p className="text-[10px] font-semibold uppercase tracking-[0.2em] text-slate-500">Access</p>
                <p className="mt-1 text-sm font-semibold text-white">{item.access_level || 'free'}</p>
              </div>
              <div>
                <p className="text-[10px] font-semibold uppercase tracking-[0.2em] text-slate-500">Status</p>
                <p className="mt-1 text-sm font-semibold text-white">{item.active ? 'Visible' : 'Hidden'}</p>
              </div>
            </div>

            <PromptActions item={item} />
          </div>
        </div>
      </div>
    </article>
  )
}

function PromptGridCard({ item }) {
  return (
    <article className="group overflow-hidden rounded-[28px] border border-white/[0.08] bg-[linear-gradient(180deg,rgba(255,255,255,0.04),rgba(15,23,42,0.18))] shadow-[0_18px_60px_rgba(2,6,23,0.18)]">
      <div className="relative h-52 overflow-hidden border-b border-white/10">
        <PromptPreview item={item} compact />
        <div className="absolute inset-0 bg-[linear-gradient(180deg,rgba(2,6,23,0.02),rgba(2,6,23,0.34))]" />
      </div>
      <div className="p-5">
        <PromptMeta item={item} />
        <h2 className="mt-4 text-xl font-semibold tracking-[-0.04em] text-white">{item.title}</h2>
        <p className="mt-3 text-sm leading-7 text-slate-300">{item.excerpt || 'No excerpt added yet.'}</p>
        <div className="mt-5 flex items-center justify-between gap-3 text-sm text-slate-400">
          <span>{formatDateLabel(item.updated_at)}</span>
          <span>{item.comparisons_count || 0} comparisons</span>
        </div>
        <div className="mt-5">
          <PromptActions item={item} />
        </div>
      </div>
    </article>
  )
}

function PromptTable({ items }) {
  return (
    <div className="overflow-hidden rounded-[30px] border border-white/[0.08] bg-[linear-gradient(180deg,rgba(15,23,42,0.92),rgba(2,6,23,0.92))] shadow-[0_24px_80px_rgba(2,6,23,0.22)]">
      <div className="overflow-x-auto">
        <table className="min-w-full divide-y divide-white/10 text-left">
          <thead className="bg-white/[0.04] text-[11px] font-semibold uppercase tracking-[0.22em] text-slate-400">
            <tr>
              <th className="px-5 py-4">Prompt</th>
              <th className="px-5 py-4">Category</th>
              <th className="px-5 py-4">Access</th>
              <th className="px-5 py-4">Signals</th>
              <th className="px-5 py-4">Updated</th>
              <th className="px-5 py-4 text-right">Actions</th>
            </tr>
          </thead>
          <tbody className="divide-y divide-white/10 text-sm text-slate-200">
            {items.map((item) => (
              <tr key={item.id} className="align-top transition hover:bg-white/[0.03]">
                <td className="px-5 py-4">
                  <div className="flex gap-4">
                    <div className="h-16 w-20 overflow-hidden rounded-2xl border border-white/10 bg-black/30 shrink-0">
                      <PromptPreview item={item} compact />
                    </div>
                    <div>
                      <p className="font-semibold text-white">{item.title}</p>
                      <p className="mt-1 max-w-md text-sm leading-6 text-slate-400">{item.excerpt || 'No excerpt added yet.'}</p>
                    </div>
                  </div>
                </td>
                <td className="px-5 py-4">{item.category_name || 'Uncategorized'}</td>
                <td className="px-5 py-4">{item.access_level || 'free'}</td>
                <td className="px-5 py-4">
                  <div className="space-y-1">
                    <p>{item.comparisons_count || 0} comparisons</p>
                    <p>{item.difficulty || 'No difficulty'}</p>
                    <p>{item.active ? 'Active' : 'Draft'}</p>
                  </div>
                </td>
                <td className="px-5 py-4">{formatDateLabel(item.updated_at)}</td>
                <td className="px-5 py-4">
                  <div className="flex justify-end gap-2">
                    {item.preview_url ? <Link href={item.preview_url} className="rounded-full border border-[#ffcfbf]/20 bg-[#ffcfbf]/10 px-3 py-2 text-xs font-semibold text-[#fff0ea]">Preview</Link> : null}
                    <Link href={item.edit_url} className="rounded-full border border-white/10 bg-white/[0.04] px-3 py-2 text-xs font-semibold text-white">Edit</Link>
                  </div>
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </div>
  )
}

function PromptHeroCollage({ items = [] }) {
  const images = items
    .map((item) => item?.preview_image_url)
    .filter(Boolean)
    .slice(0, 4)

  if (!images.length) {
    return (
      <div className="flex min-h-[420px] items-center justify-center rounded-[32px] border border-white/10 bg-[radial-gradient(circle_at_top_left,rgba(56,189,248,0.14),transparent_24%),radial-gradient(circle_at_bottom_right,rgba(255,207,191,0.18),transparent_26%),linear-gradient(135deg,rgba(12,18,31,0.98),rgba(30,41,59,0.94))] px-8 text-center">
        <div>
          <p className="text-[11px] font-semibold uppercase tracking-[0.24em] text-slate-500">Prompt preview wall</p>
          <p className="mt-4 text-lg font-semibold text-white">Preview images will appear here as prompts get covers.</p>
        </div>
      </div>
    )
  }

  return (
    <div className="grid min-h-[420px] grid-cols-2 gap-3">
      {images.map((image, index) => (
        <div
          key={`${image}-${index}`}
          className={`overflow-hidden rounded-[28px] border border-white/10 bg-black/20 shadow-[0_18px_45px_rgba(2,6,23,0.2)] ${index === 0 ? 'col-span-2 aspect-[16/9]' : index === 3 ? 'aspect-[4/5]' : 'aspect-square'}`}
        >
          <img src={image} alt="" aria-hidden="true" className="h-full w-full object-cover" />
        </div>
      ))}
    </div>
  )
}

function PaginationLinks({ links = [] }) {
  if (!Array.isArray(links) || links.length <= 3) return null

  return (
    <div className="mt-8 flex flex-wrap gap-2">
      {links.map((link, index) => {
        const label = paginationLabel(link.label)
        const className = link.active
          ? 'border-sky-300/25 bg-sky-300/12 text-sky-100'
          : 'border-white/10 bg-white/[0.04] text-slate-200 hover:border-white/20 hover:bg-white/[0.07]'

        return link.url ? (
          <Link key={`${label}-${index}`} href={link.url} className={`rounded-full border px-4 py-2 text-sm font-semibold transition ${className}`} preserveScroll>
            {label}
          </Link>
        ) : (
          <span key={`${label}-${index}`} className="rounded-full border border-white/10 bg-black/20 px-4 py-2 text-sm font-semibold text-slate-500">{label}</span>
        )
      })}
    </div>
  )
}

function PromptIndexContent({ title, subtitle, items, createUrl }) {
  const promptItems = items?.data || []
  const summary = promptSummary(promptItems)
  const [viewMode, setViewMode] = useState('gallery')

  useEffect(() => {
    if (typeof window === 'undefined') return

    const storedView = window.localStorage.getItem(PROMPT_VIEW_STORAGE_KEY)
    if (PROMPT_VIEW_OPTIONS.some((option) => option.value === storedView)) {
      setViewMode(storedView)
    }
  }, [])

  useEffect(() => {
    if (typeof window === 'undefined') return
    window.localStorage.setItem(PROMPT_VIEW_STORAGE_KEY, viewMode)
  }, [viewMode])

  return (
    <div className="space-y-6">
      <section className="overflow-hidden rounded-[38px] border border-white/[0.08] bg-[radial-gradient(circle_at_top_left,rgba(56,189,248,0.16),transparent_24%),radial-gradient(circle_at_bottom_right,rgba(255,207,191,0.16),transparent_24%),linear-gradient(135deg,rgba(4,9,18,0.98),rgba(15,23,42,0.92))] shadow-[0_28px_90px_rgba(2,6,23,0.28)]">
        <div className="grid gap-8 p-6 xl:grid-cols-[minmax(0,1.08fr)_420px] xl:items-end xl:p-10">
          <div>
            <div className="flex flex-wrap gap-2">
              <span className="rounded-full border border-[#ffcfbf]/20 bg-[#ffcfbf]/10 px-3 py-1 text-[11px] font-semibold uppercase tracking-[0.24em] text-[#fff0ea]">Academy moderation</span>
              <span className="rounded-full border border-white/10 bg-white/[0.05] px-3 py-1 text-[11px] font-semibold uppercase tracking-[0.24em] text-slate-300">Prompt library</span>
            </div>

            <h2 className="mt-5 max-w-4xl text-4xl font-semibold tracking-[-0.055em] text-white md:text-5xl xl:text-6xl">{title}</h2>
            <p className="mt-5 max-w-3xl text-base leading-8 text-slate-300 md:text-lg">{subtitle} Review prompts in a visual-first moderation surface, jump into edits quickly, and switch between gallery, grid, or table depending on the task in front of you.</p>

            <div className="mt-7 grid gap-3 sm:grid-cols-3">
              <div className="rounded-[24px] border border-white/10 bg-black/20 px-5 py-4">
                <p className="text-[10px] font-semibold uppercase tracking-[0.18em] text-slate-500">Visual-first</p>
                <p className="mt-2 text-sm font-semibold text-white">Curate covers and prompt outputs before opening the form.</p>
              </div>
              <div className="rounded-[24px] border border-white/10 bg-black/20 px-5 py-4">
                <p className="text-[10px] font-semibold uppercase tracking-[0.18em] text-slate-500">Workflow-ready</p>
                <p className="mt-2 text-sm font-semibold text-white">Switch between gallery, compact cards, and scan-heavy tables.</p>
              </div>
              <div className="rounded-[24px] border border-white/10 bg-black/20 px-5 py-4">
                <p className="text-[10px] font-semibold uppercase tracking-[0.18em] text-slate-500">Comparison-aware</p>
                <p className="mt-2 text-sm font-semibold text-white">Spot prompts with provider notes and attached result references.</p>
              </div>
            </div>

            <div className="mt-6 flex flex-wrap gap-3">
              {PROMPT_VIEW_OPTIONS.map((option) => {
                const active = option.value === viewMode

                return (
                  <button
                    key={option.value}
                    type="button"
                    onClick={() => setViewMode(option.value)}
                    className={`inline-flex items-center gap-2 rounded-full border px-4 py-2 text-sm font-semibold transition ${active ? 'border-sky-300/25 bg-sky-300/12 text-sky-100' : 'border-white/10 bg-white/[0.04] text-slate-200 hover:border-white/20 hover:bg-white/[0.07]'}`}
                  >
                    <i className={`fa-solid ${option.icon}`} />
                    <span>{option.label} view</span>
                  </button>
                )
              })}
            </div>

            <div className="mt-7 flex flex-wrap gap-3">
              <Link href={createUrl} className="rounded-full border border-sky-300/25 bg-sky-300/12 px-5 py-3 text-sm font-semibold text-sky-100">Create prompt</Link>
              <Link href="/academy/prompts" className="rounded-full border border-white/10 bg-white/[0.04] px-5 py-3 text-sm font-semibold text-white/85">Open public library</Link>
              <span className="rounded-full border border-white/10 bg-white/[0.04] px-5 py-3 text-sm font-semibold text-white/85">{summary.total} prompts in view</span>
            </div>

            <div className="mt-7 grid gap-3 sm:grid-cols-2 xl:grid-cols-4">
              <div className="rounded-[24px] border border-white/10 bg-black/20 px-5 py-4">
                <p className="text-[10px] font-semibold uppercase tracking-[0.18em] text-slate-500">Active</p>
                <p className="mt-2 text-2xl font-semibold tracking-[-0.04em] text-white">{summary.active}</p>
              </div>
              <div className="rounded-[24px] border border-white/10 bg-black/20 px-5 py-4">
                <p className="text-[10px] font-semibold uppercase tracking-[0.18em] text-slate-500">Featured</p>
                <p className="mt-2 text-2xl font-semibold tracking-[-0.04em] text-white">{summary.featured}</p>
              </div>
              <div className="rounded-[24px] border border-white/10 bg-black/20 px-5 py-4">
                <p className="text-[10px] font-semibold uppercase tracking-[0.18em] text-slate-500">Prompt of week</p>
                <p className="mt-2 text-2xl font-semibold tracking-[-0.04em] text-white">{summary.promptOfWeek}</p>
              </div>
              <div className="rounded-[24px] border border-white/10 bg-black/20 px-5 py-4">
                <p className="text-[10px] font-semibold uppercase tracking-[0.18em] text-slate-500">Comparisons</p>
                <p className="mt-2 text-2xl font-semibold tracking-[-0.04em] text-white">{summary.comparisons}</p>
              </div>
            </div>
          </div>

          <div>
            <PromptHeroCollage items={promptItems} />
          </div>
        </div>
      </section>

      <div className="flex flex-wrap items-center justify-between gap-4">
        <p className="text-sm text-slate-400">Manage Academy content below. Changes clear Academy cache automatically.</p>
        <div className="flex flex-wrap gap-3">
          <Link href="/academy/prompts" className="rounded-full border border-white/10 bg-white/[0.04] px-5 py-3 text-sm font-semibold text-white/85">View public library</Link>
          <Link href={createUrl} className="rounded-full border border-sky-300/25 bg-sky-300/12 px-5 py-3 text-sm font-semibold text-sky-100">Create prompt</Link>
        </div>
      </div>

      {promptItems.length === 0 ? (
        <div className="rounded-[28px] border border-white/[0.08] bg-white/[0.03] px-6 py-12 text-center text-slate-400">No prompt templates exist yet.</div>
      ) : viewMode === 'table' ? (
        <PromptTable items={promptItems} />
      ) : viewMode === 'grid' ? (
        <div className="grid gap-5 md:grid-cols-2 2xl:grid-cols-3">
          {promptItems.map((item) => <PromptGridCard key={item.id} item={item} />)}
        </div>
      ) : (
        <div className="space-y-5">
          {promptItems.map((item) => <PromptGalleryCard key={item.id} item={item} />)}
        </div>
      )}

      <PaginationLinks links={items?.links} />
    </div>
  )
}

export default function AcademyCrudIndex({ title, subtitle, items, columns, createUrl }) {
  const flash = usePage().props.flash || {}

  return (
    <AdminLayout title={title} subtitle={subtitle}>
      <Head title={`Admin · ${title}`} />

      {flash.success ? <div className="mb-6 rounded-2xl border border-emerald-300/20 bg-emerald-300/10 px-4 py-3 text-sm text-emerald-100">{flash.success}</div> : null}

      {usePage().props.resource === 'prompts' ? (
        <PromptIndexContent title={title} subtitle={subtitle} items={items} createUrl={createUrl} />
      ) : (
        <>
          <div className="mb-6 flex items-center justify-between gap-4">
            <p className="text-sm text-slate-400">Manage Academy content below. Changes clear Academy cache automatically.</p>
            <Link href={createUrl} className="rounded-full border border-sky-300/25 bg-sky-300/12 px-5 py-3 text-sm font-semibold text-sky-100">Create record</Link>
          </div>

          {(items?.data || []).length === 0 ? (
            <div className="rounded-[28px] border border-white/[0.08] bg-white/[0.03] px-6 py-12 text-center text-slate-400">No records exist yet.</div>
          ) : (
            <div className="space-y-4">
              {items.data.map((item) => (
                <div key={item.id} className="rounded-[28px] border border-white/[0.08] bg-white/[0.03] p-5">
                  <div className="grid gap-4 lg:grid-cols-[minmax(0,1fr)_auto] lg:items-center">
                    <div className="grid gap-2 sm:grid-cols-2 xl:grid-cols-5">
                      {columns.map((column) => (
                        <div key={column}>
                          <p className="text-[11px] font-semibold uppercase tracking-[0.2em] text-slate-500">{column.replaceAll('_', ' ')}</p>
                          <p className="mt-1 text-sm text-white">{String(item[column] ?? '')}</p>
                        </div>
                      ))}
                    </div>

                    <div className="flex flex-wrap gap-3 lg:justify-end">
                      {item.builder_url ? <Link href={item.builder_url} className="rounded-full border border-amber-300/20 bg-amber-300/10 px-4 py-2 text-sm font-semibold text-amber-100">Builder</Link> : null}
                      <Link href={item.edit_url} className="rounded-full border border-white/10 bg-white/[0.04] px-4 py-2 text-sm font-semibold text-white">Edit</Link>
                      <button type="button" onClick={() => { if (!window.confirm('Delete this record?')) return; router.delete(item.destroy_url, { preserveScroll: true }) }} className="rounded-full border border-rose-300/20 bg-rose-300/10 px-4 py-2 text-sm font-semibold text-rose-100">Delete</button>
                    </div>
                  </div>
                </div>
              ))}
            </div>
          )}
        </>
      )}
    </AdminLayout>
  )
}