"use client";

import { FileText } from "lucide-react";
import {
  BaseBoxShapeUtil,
  HTMLContainer,
  T,
  type TLBaseShape,
  toDomPrecision,
} from "tldraw";

import { cn } from "@/lib/utils";

export type DocumentCardShape = TLBaseShape<
  "document-card",
  {
    w: number;
    h: number;
    objectId: string;
    title: string;
    preview: string;
  }
>;

/**
 * Register this shape with tldraw so `BaseBoxShapeUtil<DocumentCardShape>` accepts
 * it. tldraw's `TLBaseBoxShape = ExtractShapeByProps<{ w, h }>` extracts from
 * `TLShape`, which only knows about built-in shapes unless we add an entry to
 * `TLGlobalShapePropsMap` here.
 */
declare module "@tldraw/tlschema" {
  interface TLGlobalShapePropsMap {
    "document-card": DocumentCardShape["props"];
  }
}

function truncatePreview(text: string, max = 100): string {
  const t = text.trim();
  if (t.length <= max) return t;
  return `${t.slice(0, max - 1)}…`;
}

function DocumentCardBody({ shape }: { shape: DocumentCardShape }) {
  const { title, preview } = shape.props;
  const body = truncatePreview(preview);

  return (
    <HTMLContainer>
      <div
        className={cn(
          "flex h-full w-full flex-col overflow-hidden rounded-xl border border-[hsl(var(--border))] border-l-[3px] border-l-[hsl(var(--teal))] bg-[hsl(var(--card))] text-[hsl(var(--card-foreground))] shadow-sm",
          "ring-1 ring-[hsl(var(--teal)/0.2)]",
        )}
        style={{ fontSize: "11px", lineHeight: 1.45 }}
      >
        <div className="flex min-h-0 flex-1 flex-col px-2.5 pb-1.5 pt-2">
          <div className="flex min-w-0 items-start gap-2">
            <FileText
              className="mt-0.5 size-4 shrink-0 text-[hsl(var(--teal))]"
              strokeWidth={2}
              aria-hidden
            />
            <div className="min-w-0 flex-1 font-semibold leading-tight tracking-tight text-[13px]">
              {title || "Untitled document"}
            </div>
          </div>
          <p
            className="mt-2 line-clamp-3 min-h-[3.6em] text-[11px] leading-snug text-[hsl(var(--muted-foreground))]"
            title={preview || undefined}
          >
            {body || "No preview yet."}
          </p>
        </div>
        <div className="border-t border-[hsl(var(--border)/0.65)] bg-[hsl(var(--muted)/0.35)] px-2.5 py-1 text-[9px] font-medium uppercase tracking-wider text-[hsl(var(--muted-foreground))]">
          Document
        </div>
      </div>
    </HTMLContainer>
  );
}

export class DocumentCardShapeUtil extends BaseBoxShapeUtil<DocumentCardShape> {
  static override type = "document-card";

  static override props = {
    w: T.number,
    h: T.number,
    objectId: T.string,
    title: T.string,
    preview: T.string,
  };

  override getDefaultProps(): DocumentCardShape["props"] {
    return {
      w: 220,
      h: 140,
      objectId: "",
      title: "Document",
      preview: "",
    };
  }

  override getAriaDescriptor(shape: DocumentCardShape) {
    return shape.props.title;
  }

  override component(shape: DocumentCardShape) {
    return <DocumentCardBody shape={shape} />;
  }

  override indicator(shape: DocumentCardShape) {
    return (
      <rect
        width={toDomPrecision(shape.props.w)}
        height={toDomPrecision(shape.props.h)}
        rx={10}
        ry={10}
      />
    );
  }

  override useLegacyIndicator() {
    return false;
  }

  override getIndicatorPath(shape: DocumentCardShape) {
    const p = new Path2D();
    p.roundRect(0, 0, shape.props.w, shape.props.h, 10);
    return p;
  }
}