'use client';

import { CalendarClock, ChevronRight, MessageSquare, Users } from 'lucide-react';
import type { JobStatus } from '@linkdr/shared';
import { cn, formatRelativeTime, formatWhen } from '@/lib/utils';

export type Perspective = 'client' | 'pro';

/**
 * The status of a job, as a word and a tint. §8 — never colour alone.
 *
 * Two maps, because the same status means different things to the two sides.
 * `matched` is "somebody said yes" to a customer and "you said yes" to a pro;
 * one shared wording would fit neither, and a pro reading "Pros interested"
 * about their own accepted job would reasonably think it was somebody else's.
 */
const STATUS: Record<Perspective, Record<JobStatus, { label: string; className: string }>> = {
  client: {
    open: { label: 'Looking for pros', className: 'border-brand-200 bg-brand-100 text-ink-950' },
    matched: { label: 'Pros interested', className: 'border-go-100 bg-go-50 text-go-700' },
    booked: { label: 'Booked', className: 'border-go-100 bg-go-50 text-go-700' },
    completed: { label: 'Done', className: 'border-hairline bg-inset text-muted' },
    cancelled: { label: 'Cancelled', className: 'border-stop-100 bg-stop-50 text-stop-600' },
  },
  pro: {
    open: { label: 'Still open', className: 'border-brand-200 bg-brand-100 text-ink-950' },
    matched: { label: 'You accepted', className: 'border-go-100 bg-go-50 text-go-700' },
    booked: { label: 'Booked', className: 'border-go-100 bg-go-50 text-go-700' },
    completed: { label: 'Done', className: 'border-hairline bg-inset text-muted' },
    cancelled: { label: 'Cancelled', className: 'border-stop-100 bg-stop-50 text-stop-600' },
  },
};

export interface JobRowData {
  id: string;
  title: string;
  status: JobStatus;
  /** The second line. The trade for a client, the customer's name for a pro. */
  subtitle: string;
  createdAt: Date;
  matchCount?: number;
  pendingCount?: number;
  unreadCount: number;
  lastMessageAt: Date | null;
  nextBookingAt: Date | null;
}

/**
 * One line of live detail per row, chosen by priority rather than stacked.
 *
 * A row that shows unread messages AND a booking AND three pending requests is a
 * row nobody reads. The order is what the person has to act on soonest: someone
 * is waiting for a reply, then something is about to happen, then someone is
 * waiting for a decision.
 */
function liveDetail(job: JobRowData): { icon: typeof Users; text: string; urgent: boolean } | null {
  if (job.unreadCount > 0) {
    return {
      icon: MessageSquare,
      text: job.unreadCount === 1 ? '1 new message' : `${job.unreadCount} new messages`,
      urgent: true,
    };
  }
  if (job.nextBookingAt) {
    return { icon: CalendarClock, text: formatWhen(job.nextBookingAt), urgent: false };
  }
  if (job.matchCount) {
    return {
      icon: Users,
      text: job.matchCount === 1 ? '1 pro accepted' : `${job.matchCount} pros accepted`,
      urgent: false,
    };
  }
  if (job.pendingCount) {
    return {
      icon: Users,
      text: job.pendingCount === 1 ? '1 pro deciding' : `${job.pendingCount} pros deciding`,
      urgent: false,
    };
  }
  return null;
}

/**
 * DESIGN.md §6.10, applied to a job rather than a pro.
 *
 * No thumbnail: a job's photos are of a broken boiler, and a 56px crop of one
 * says nothing at a glance. The trade and the status carry the row instead.
 */
export function JobRow({
  job,
  perspective,
  onOpen,
}: {
  job: JobRowData;
  perspective: Perspective;
  onOpen: (jobId: string) => void;
}) {
  const status = STATUS[perspective][job.status];
  const detail = liveDetail(job);
  const timestamp = job.lastMessageAt ?? job.createdAt;

  return (
    <button
      type="button"
      onClick={() => onOpen(job.id)}
      className={cn(
        'flex w-full items-center gap-3 rounded-card border border-hairline bg-raised p-4 text-left',
        'transition-[border-color] duration-[120ms] ease-standard',
        'hover:border-brand-500 active:border-brand-500',
      )}
    >
      <span className="min-w-0 flex-1">
        <span className="flex items-baseline justify-between gap-2">
          <span className="truncate font-display text-h4 text-strong">{job.title}</span>
          <span className="shrink-0 text-meta text-faint tabular-nums">
            {formatRelativeTime(timestamp)}
          </span>
        </span>

        <span className="mt-2 flex flex-wrap items-center gap-2">
          <span
            className={cn(
              'inline-flex items-center rounded-pill border px-3 py-1 text-meta',
              status.className,
            )}
          >
            {status.label}
          </span>
          <span className="truncate text-body-sm text-muted">{job.subtitle}</span>
        </span>

        {detail && (
          <span
            className={cn(
              'mt-1.5 flex items-center gap-1.5 text-meta',
              detail.urgent ? 'font-semibold text-accent' : 'text-faint',
            )}
          >
            <detail.icon className="h-3.5 w-3.5 shrink-0" aria-hidden />
            {detail.text}
          </span>
        )}
      </span>

      <ChevronRight className="h-4 w-4 shrink-0 text-accent" aria-hidden />
    </button>
  );
}

/** Placeholder at the row's own height, so the list does not jump when it lands. */
export function JobRowSkeleton() {
  return <div className="h-[6.5rem] animate-pulse rounded-card bg-inset" aria-hidden />;
}