'use client'

import { useMemo, useState } from 'react'
import { planSpans, type Span } from '@/lib/plan'
import type { Portfolio, Project } from '@/lib/types'
import Cover from './Cover'
import styles from './projects.module.css'

const monthYear = (iso?: string) => (iso ? new Date(iso).toLocaleDateString('en', { month: 'short', year: 'numeric' }) : '')

// Aspect ratio of a plate for each span on desktop, used to decide whether a demo image can be cropped to fill it.
const PLATE_RATIO: Record<Span, number> = { 2: 4 / 3, 3: 3 / 2, 4: 16 / 9, 6: 16 / 10 }

function Plate({ project, span }: Readonly<{ project: Project; span: Span }>) {
  const [broken, setBroken] = useState(false)
  const demo = project.demo
  const title = project.title ?? project.name
  if (!demo || broken) return <Cover name={project.name} />

  const drift = Math.abs(Math.log(demo.width / demo.height / PLATE_RATIO[span]))
  const fits = drift < Math.log(1.7)
  const image = (className: string, extra: React.ImgHTMLAttributes<HTMLImageElement>) => (
    // eslint-disable-next-line @next/next/no-img-element
    <img className={className} src={demo.url} width={demo.width} height={demo.height} decoding="async" {...extra} />
  )
  return (
    <>
      {/* An image that does not match the plate is shown whole, over a blurred copy of itself. */}
      {!fits && image(styles.backdrop, { alt: '', 'aria-hidden': true, loading: 'lazy' })}
      {image(fits ? styles.cover : styles.contain, { alt: `${title}, demo`, loading: 'lazy', onError: () => setBroken(true) })}
    </>
  )
}

function Item({ project, span }: Readonly<{ project: Project; span: Span }>) {
  const title = project.title ?? project.name
  const links = [
    { label: 'Repository', href: project.url },
    ...(project.homepage ? [{ label: 'Live site', href: project.homepage }] : []),
    ...(project.links ?? []),
  ]
  return (
    <article className={styles.item} data-span={span}>
      <a className={styles.plate} href={project.url} target="_blank" rel="noreferrer" aria-label={`${title}: open the repository`}>
        <Plate project={project} span={span} />
      </a>
      <div className={styles.caption}>
        <h3>{title}</h3>
        {(project.kind ?? project.language) && <p className={styles.kind}>{project.kind ?? project.language}</p>}
        {project.description && <p className={styles.description}>{project.description}</p>}
        {project.highlights && project.highlights.length > 0 && (
          <ul className={styles.points}>{project.highlights.map((point) => <li key={point}>{point}</li>)}</ul>
        )}
        <div className={styles.foot}>
          {project.tech.length > 0 && <ul className={styles.tags}>{project.tech.map((tag) => <li key={tag}>{tag}</li>)}</ul>}
          <p className={styles.links}>
            {links.map((link) => (
              <a key={link.href} href={link.href} target="_blank" rel="noreferrer">{link.label}</a>
            ))}
          </p>
        </div>
      </div>
    </article>
  )
}

type Props = {
  projects: Project[]
  status: 'loading' | 'live' | 'offline'
  generatedAt?: string
  profileUrl: string
  portfolio: Portfolio
}

export default function Projects({ projects, status, generatedAt, profileUrl, portfolio }: Readonly<Props>) {
  const spans = useMemo(() => planSpans(projects.length), [projects.length])
  return (
    <section className={styles.section} id="projects">
      <div className={styles.shell}>
        <div className={styles.head}>
          <h2>Selected work</h2>
          {status === 'live' && <p className={styles.note}>Read live from Gitea, updated {monthYear(generatedAt)}</p>}
        </div>

        {status === 'loading' && (
          <div className={styles.skeleton} aria-hidden="true">
            <span /><span /><span />
          </div>
        )}
        {status === 'loading' && (
          <noscript>
            <p className={styles.notice}>The project list is loaded live and needs JavaScript. See <a href={profileUrl}>{profileUrl.replace('https://', '')}</a>.</p>
          </noscript>
        )}
        {status === 'offline' && (
          <p className={styles.notice}>
            The project list could not be loaded right now. All repositories are on <a href={profileUrl}>{profileUrl.replace('https://', '')}</a>.
          </p>
        )}

        <div className={styles.grid} data-count={projects.length}>
          {projects.map((project, index) => (
            <Item key={project.name} project={project} span={spans[index]} />
          ))}
        </div>

        {status === 'live' && projects.length > 0 && (
          <a className={styles.more} href={portfolio.href} target="_blank" rel="noreferrer">
            <span>
              <span className={styles.moreTitle}>There is more in the portfolio</span>
              <span className={styles.moreText}>
                {portfolio.count ? `${portfolio.count} projects in total, including the ones above.` : 'The full list of projects, including the ones above.'}
              </span>
            </span>
            <span className={styles.moreButton}>{portfolio.label ?? 'Open the portfolio'}</span>
          </a>
        )}
      </div>
    </section>
  )
}