import { Button } from "@repo/shadcn-ui/components/button";
import {
  Popover,
  PopoverContent,
  PopoverTitle,
  PopoverTrigger,
} from "@repo/shadcn-ui/components/popover";
import type { ReactNode } from "react";
import { useContext, useEffect, useId, useRef } from "react";
import { createPortal } from "react-dom";

import { DialogHelpContext, DialogHelpLabelsContext } from "../lib/dialog-help-context";
import type { DialogHelpPresentation } from "../lib/dialog-help-presentation";
import { CircleHelpIcon } from "../lib/icons";

/** Slot declarativo: los portales conservan contexto, traducciones y una única copia del contenido. */
export function DialogHelp({
  title,
  children,
  presentation = "auto",
}: {
  title: string;
  children: ReactNode;
  presentation?: DialogHelpPresentation;
}) {
  const dialog = useContext(DialogHelpContext);
  const labels = useContext(DialogHelpLabelsContext);
  const contentId = useId();
  const titleId = useId();
  const headingRef = useRef<HTMLHeadingElement>(null);
  const wasOpen = useRef(false);
  const triggerRef = dialog?.triggerRef;
  const open = dialog?.open ?? false;
  const mode = dialog?.mode;

  // El destino cambia al redimensionar. El foco debe salir del formulario antes de ocultarlo.
  useEffect(() => {
    if (open && mode !== "popover") {
      headingRef.current?.focus();
    } else if (!open && wasOpen.current) {
      triggerRef?.current?.focus();
    }
    wasOpen.current = open;
  }, [open, mode, triggerRef]);

  if (!(dialog?.actionsHost && dialog.contentHost)) {
    return null;
  }

  const close = () => {
    dialog.setPresentation(null);
    dialog.triggerRef.current?.focus();
  };

  const trigger = (
    <Button
      aria-controls={open ? contentId : undefined}
      aria-expanded={open}
      aria-label={labels.help}
      onClick={() => (open ? close() : dialog.setPresentation(presentation))}
      ref={dialog.triggerRef}
      size="icon-sm"
      type="button"
      variant="ghost"
    >
      <CircleHelpIcon aria-hidden="true" />
    </Button>
  );

  return (
    <>
      {createPortal(
        mode === "popover" || (!open && presentation === "compact") ? (
          <Popover
            onOpenChange={(next) => dialog.setPresentation(next ? presentation : null)}
            open={open && mode === "popover"}
          >
            <PopoverTrigger render={trigger} />
            <PopoverContent
              align="end"
              className="max-h-[min(60dvh,var(--available-height))] max-w-[calc(100vw-2rem)] overflow-y-auto break-words motion-reduce:animate-none! motion-reduce:transition-none!"
              finalFocus={dialog.triggerRef}
              id={contentId}
              initialFocus
            >
              <PopoverTitle className="text-sm font-semibold">{title}</PopoverTitle>
              {children}
              <Button onClick={close} size="sm" type="button" variant="outline">
                {labels.closeHelp}
              </Button>
            </PopoverContent>
          </Popover>
        ) : (
          trigger
        ),
        dialog.actionsHost
      )}
      {createPortal(
        open && mode !== "popover" ? (
          <section
            aria-labelledby={titleId}
            className="flex h-full min-h-0 flex-col gap-4 overflow-y-auto overscroll-contain break-words p-5"
            data-slot="dialog-help"
            id={contentId}
          >
            <h2
              className="text-base font-semibold focus-visible:outline-ring"
              id={titleId}
              ref={headingRef}
              tabIndex={-1}
            >
              {title}
            </h2>
            <div className="min-h-[3lh] flex-1 overflow-y-auto overscroll-contain px-1">
              {children}
            </div>
            <Button className="shrink-0 self-start" onClick={close} type="button" variant="outline">
              {mode === "view" ? labels.backToForm : labels.closeHelp}
            </Button>
          </section>
        ) : null,
        dialog.contentHost
      )}
    </>
  );
}