import { useEntitySetContext } from "components/EntitySetProvider";
import { generateKeyBetween } from "fractional-indexing";
import { useEffect, useState } from "react";
import { useEntity, useReplicache } from "src/replicache";
import { useUIState } from "src/useUIState";
import { addLinkBlock } from "src/utils/addLinkBlock";
import { BlockProps, BlockLayout } from "./Block";
import { v7 } from "uuid";
import { useSmoker } from "components/Toast";
import { Separator } from "components/Layout";
import { Input } from "components/Input";
import { focusElement } from "src/utils/focusElement";
import { isUrl } from "src/utils/isURL";
import { elementId } from "src/utils/elementId";
import { focusBlock } from "src/utils/focusBlock";
import { CheckTiny } from "components/Icons/CheckTiny";
import { LinkSmall } from "components/Icons/LinkSmall";

export const ExternalLinkBlock = (
  props: BlockProps & { preview?: boolean },
) => {
  let { permissions } = useEntitySetContext();
  let previewImage = useEntity(props.entityID, "link/preview");
  let title = useEntity(props.entityID, "link/title");
  let description = useEntity(props.entityID, "link/description");
  let url = useEntity(props.entityID, "link/url");

  let isSelected = useUIState((s) =>
    s.selectedBlocks.find((b) => b.value === props.entityID),
  );
  useEffect(() => {
    if (props.preview) return;
    let input = document.getElementById(elementId.block(props.entityID).input);
    if (isSelected) {
      setTimeout(() => {
        let input = document.getElementById(
          elementId.block(props.entityID).input,
        );
        focusElement(input as HTMLInputElement | null);
      }, 20);
    } else input?.blur();
  }, [isSelected, props.entityID, props.preview]);

  if (url === undefined) {
    if (!permissions.write) return null;
    return (
      <label
        className={`
          w-full h-[104px] p-2
          text-tertiary hover:text-accent-contrast hover:cursor-pointer
          flex flex-auto gap-2 items-center justify-center hover:border-2 border-dashed rounded-lg
          ${isSelected ? "border-2 border-tertiary" : "border border-border"}
          ${props.pageType === "canvas" && "bg-bg-page"}`}
        onMouseDown={() => {
          focusBlock(
            { type: props.type, value: props.entityID, parent: props.parent },
            { type: "start" },
          );
        }}
      >
        <BlockLinkInput {...props} />
      </label>
    );
  }

  return (
    <BlockLayout
      isSelected={!!isSelected}
      hasBackground="page"
      borderOnHover
      className="externalLinkBlock flex relative group/linkBlock h-[104px] p-0!"
    >
      <a
        href={url?.data.value}
        target="_blank"
        referrerPolicy="no-referrer"
        className="flex w-full h-full text-primary hover:no-underline no-underline"
      >
        <div className="pt-2 pb-2 px-3 grow min-w-0">
          <div className="flex flex-col w-full min-w-0 h-full grow ">
            <div
              className={`linkBlockTitle bg-transparent -mb-0.5  border-none font-bold outline-hidden resize-none align-top border h-[24px] line-clamp-1`}
              style={{
                overflow: "hidden",
                textOverflow: "ellipsis",
                wordBreak: "break-all",
              }}
            >
              {title?.data.value}
            </div>

            <div
              className={`linkBlockDescription text-sm bg-transparent border-none outline-hidden resize-none align-top  grow line-clamp-2`}
            >
              {description?.data.value}
            </div>
            <div
              style={{ wordBreak: "break-word" }} // better than tailwind break-all!
              className={`min-w-0 w-full line-clamp-1 text-xs italic group-hover/linkBlock:text-accent-contrast ${isSelected ? "text-accent-contrast" : "text-tertiary"}`}
            >
              {url?.data.value}
            </div>
          </div>
        </div>

        <div
          className={`linkBlockPreview w-[120px] m-2 -mb-2 bg-cover shrink-0 rounded-t-md border border-border rotate-[4deg] origin-center`}
          style={{
            backgroundImage: `url(${previewImage?.data.src})`,
            backgroundPosition: "center",
          }}
        />
      </a>
    </BlockLayout>
  );
};

const BlockLinkInput = (props: BlockProps & { preview?: boolean }) => {
  let isSelected = useUIState((s) =>
    s.selectedBlocks.find((b) => b.value === props.entityID),
  );
  let entity_set = useEntitySetContext();
  let [linkValue, setLinkValue] = useState("");
  let { rep } = useReplicache();
  let submit = async () => {
    let linkEntity = props.entityID;
    if (!linkEntity) {
      linkEntity = v7();

      await rep?.mutate.addBlock({
        permission_set: entity_set.set,
        factID: v7(),
        parent: props.parent,
        type: "card",
        position: generateKeyBetween(props.position, props.nextPosition),
        newEntityID: linkEntity,
      });
    }
    let link = linkValue;
    if (!linkValue.startsWith("http")) link = `https://${linkValue}`;
    addLinkBlock(link, linkEntity, rep);

    let textEntity = v7();
    await rep?.mutate.addBlock({
      permission_set: entity_set.set,
      factID: v7(),
      parent: props.parent,
      type: "text",
      position: generateKeyBetween(props.position, props.nextPosition),
      newEntityID: textEntity,
    });

    focusBlock(
      {
        value: textEntity,
        type: "text",
        parent: props.parent,
      },
      { type: "start" },
    );
  };
  let smoker = useSmoker();

  return (
    <div className={`max-w-sm flex gap-2 rounded-md text-secondary`}>
      <>
        <LinkSmall
          className={`shrink-0  ${isSelected ? "text-tertiary" : "text-border"} `}
        />
        <Separator />
        <Input
          id={
            !props.preview ? elementId.block(props.entityID).input : undefined
          }
          type="url"
          className="w-full grow border-none outline-hidden bg-transparent "
          placeholder="www.example.com"
          value={linkValue}
          onChange={(e) => setLinkValue(e.target.value)}
          onKeyDown={(e) => {
            if (e.key === "Enter") {
              e.preventDefault();
              if (!linkValue) return;
              if (!isUrl(linkValue)) {
                let rect = e.currentTarget.getBoundingClientRect();
                smoker({
                  alignOnMobile: "left",
                  error: true,
                  text: "invalid url!",
                  position: { x: rect.left, y: rect.top - 8 },
                });
                return;
              }
              submit();
            }
          }}
        />
        <div className="flex items-center gap-3 ">
          <button
            autoFocus={false}
            className={`p-1 ${isSelected ? "text-accent-contrast" : "text-border"}`}
            onMouseDown={(e) => {
              e.preventDefault();
              if (!linkValue || linkValue === "") {
                smoker({
                  alignOnMobile: "left",
                  error: true,
                  text: "no url!",
                  position: { x: e.clientX, y: e.clientY },
                });
                return;
              }
              if (!isUrl(linkValue)) {
                smoker({
                  alignOnMobile: "left",
                  error: true,
                  text: "invalid url!",
                  position: { x: e.clientX, y: e.clientY },
                });
                return;
              }
              submit();
            }}
          >
            <CheckTiny />
          </button>
        </div>
      </>
    </div>
  );
};
