import { Bell, ChevronRight, Compass, Search, ShoppingCart, Zap, type LucideIcon } from 'lucide-react'
import { useState } from 'react'
import { Link, useNavigate } from 'react-router'
import { duration } from '../plan/PlanPage.tsx'
import { supplyRunScreen } from '../shopping/api.ts'
import buttonStyles from '../ui/Button.module.css'
import { EmptyState } from '../ui/EmptyState.tsx'
import { ErrorBanner } from '../ui/ErrorBanner.tsx'
import { Icon } from '../ui/Icon.tsx'
import { IconButton } from '../ui/IconButton.tsx'
import { Photo } from '../ui/Photo.tsx'
import { Skeleton } from '../ui/Skeleton.tsx'
import { useHome, type Home, type Origin, type Tonight } from './api.ts'
import styles from './HomePage.module.css'
import { RotationCheck } from './RotationCheck.tsx'
import { UpdatesSheet } from './UpdatesSheet.tsx'

const ORIGIN_LABEL: Record<Origin, string> = { regular: 'Regular', side_quest: 'Side quest' }

// meta is the Tonight card's "Regular · 40 min" line, the time only when
// the recipe says it.
function meta({ origin, minutes_total }: Tonight): string {
  return minutes_total === null ? ORIGIN_LABEL[origin] : `${ORIGIN_LABEL[origin]} · ${duration(minutes_total)}`
}

// TonightCard is the dinner planned for today: its washed photo, name and
// meta line, and the dark Recipe pill to its recipe.
function TonightCard({ tonight }: { tonight: Tonight }) {
  return (
    <section aria-label="Tonight" className={styles.card}>
      <Photo id={tonight.photo_id} name={tonight.name} inset="10px" sizes="400px" className={styles.photo} />
      <div className={styles.cardFoot}>
        <div className={styles.cardText}>
          <h2 className={styles.name}>{tonight.name}</h2>
          <span className={styles.meta}>{meta(tonight)}</span>
        </div>
        <Link to={`/dinner/${encodeURIComponent(tonight.id)}`} className={[buttonStyles.button, buttonStyles.dark, styles.recipe].join(' ')}>
          Recipe
        </Link>
      </div>
    </section>
  )
}

// NoPlan stands in for the Tonight card when today has no plan.
function NoPlan() {
  const navigate = useNavigate()
  return (
    <div className={styles.card}>
      <EmptyState title="No quest planned tonight" action={{ label: 'Plan this week', onClick: () => void navigate('/plan') }}>
        Draft this week's dinners and tonight's quest shows up here.
      </EmptyState>
    </div>
  )
}

// StatusRow is one neutral row under the tiles: a grape-700 icon, its line
// and a chevron, linking to the screen it is about.
function StatusRow({ to, icon, children }: { to: string; icon: LucideIcon; children: string }) {
  return (
    <li>
      <Link to={to} className={styles.status}>
        <Icon icon={icon} className={styles.statusIcon} />
        <span className={styles.statusText}>{children}</span>
        <Icon icon={ChevronRight} />
      </Link>
    </li>
  )
}

// StatusRows are the rows that apply: Side quests waiting in the deck, and
// a Supply run ready. With neither, there are no rows.
function StatusRows({ home }: { home: Home }) {
  const count = home.sideQuestCount
  const list = home.shoppingList
  if (count === 0 && !list.ready) return null
  return (
    <ul aria-label="Status" className={styles.statuses}>
      {count > 0 && (
        <StatusRow to="/discover" icon={Compass}>
          {`${count} new side ${count === 1 ? 'quest' : 'quests'} to swipe`}
        </StatusRow>
      )}
      {list.ready && (
        <StatusRow to={supplyRunScreen(list.weekStart)} icon={ShoppingCart}>
          {`Shopping list ready · ${list.dates}`}
        </StatusRow>
      )}
    </ul>
  )
}

// Tiles are the two shortcuts, Quick dinner and Cook from what I have.
function Tiles() {
  return (
    <div className={styles.tiles}>
      <Link to="/quick" className={[styles.tile, styles.quick].join(' ')}>
        <Icon icon={Zap} size="nav" />
        <span className={styles.tileLabel}>Quick dinner</span>
      </Link>
      <Link to="/cook-from-pantry" className={[styles.tile, styles.pantry].join(' ')}>
        <Icon icon={Search} size="nav" />
        <span className={styles.tileLabel}>Cook from what I have</span>
      </Link>
    </div>
  )
}

// HomePage is mock 1g, Home: today's date over "Tonight's quest" and the
// Recent updates bell, the Tonight card (or the way to plan the week), the
// Quick dinner and Cook from what I have tiles, and the status rows, all
// from GET /api/v1/home. Above the tiles is the Rotation check, "Keep it in
// rotation?", while a tried dinner waits for the household's answer.
//
// The bell carries a grape dot while there are unread updates and opens the
// Recent updates sheet, which marks them seen.
export function HomePage() {
  const home = useHome()
  const data = home.data
  const [updatesOpen, setUpdatesOpen] = useState(false)
  return (
    <div className={styles.page} aria-busy={home.isPending}>
      <header className={styles.header}>
        <div>
          {data !== undefined ? (
            <p className={styles.date}>{data.dateLabel}</p>
          ) : (
            home.isPending && <Skeleton data-testid="skeleton-date" className={styles.skeletonDate} />
          )}
          <h1 className={styles.title}>Tonight's quest</h1>
        </div>
        <IconButton
          label={data?.unread ? 'Recent updates, unread' : 'Recent updates'}
          className={styles.bell}
          onClick={() => setUpdatesOpen(true)}
        >
          <Icon icon={Bell} className={styles.bellIcon} />
          {data?.unread && <span data-testid="unread-dot" className={styles.dot} />}
        </IconButton>
      </header>
      {home.isPending && <Skeleton data-testid="skeleton-tonight" className={styles.skeletonCard} />}
      {home.isError && (
        <ErrorBanner onRetry={() => void home.refetch()}>Couldn't load tonight's quest. {home.error.message}</ErrorBanner>
      )}
      {data !== undefined && (data.tonight === null ? <NoPlan /> : <TonightCard tonight={data.tonight} />)}
      <RotationCheck />
      <Tiles />
      {home.isPending && (
        <div className={styles.statuses} aria-hidden="true">
          <Skeleton data-testid="skeleton-status" className={styles.skeletonStatus} />
          <Skeleton data-testid="skeleton-status" className={styles.skeletonStatus} />
        </div>
      )}
      {data !== undefined && <StatusRows home={data} />}
      <UpdatesSheet open={updatesOpen} onClose={() => setUpdatesOpen(false)} />
    </div>
  )
}