'use client';

import { NodeApi, NodeRendererProps, Tree, TreeApi } from 'react-arborist';
import {
  IconArrowsLeftRight,
  IconChevronDown,
  IconChevronRight,
  IconCornerRightUp,
  IconDotsVertical,
  IconEdit,
  IconFileDescription,
  IconLink,
  IconPlus,
  IconStar,
  IconTrash,
} from '@tabler/icons-react';

import { useEffect } from 'react';
import clsx from 'clsx';

import styles from './styles/tree.module.css';
import { ActionIcon, Menu, rem } from '@mantine/core';
import { useAtom } from 'jotai';
import { FillFlexParent } from './components/fill-flex-parent';
import { TreeNode } from './types';
import { treeApiAtom } from './atoms/tree-api-atom';
import { usePersistence } from '@/features/page/tree/hooks/use-persistence';
import { IPage } from '@/features/page/types/page.types';
import { getPages } from '@/features/page/services/page-service';
import useWorkspacePageOrder from '@/features/page/tree/hooks/use-workspace-page-order';
import { usePathname, useRouter } from 'next/navigation';

export default function PageTree() {
  const { data, setData, controllers } = usePersistence<TreeApi<TreeNode>>();
  const [tree, setTree] = useAtom<TreeApi<TreeNode>>(treeApiAtom);
  const { data: pageOrderData } = useWorkspacePageOrder();
  const pathname = usePathname();

  const fetchAndSetTreeData = async () => {
    if (pageOrderData?.childrenIds) {
      try {
        const pages = await getPages();
        const treeData = convertToTree(pages, pageOrderData.childrenIds);
        setData(treeData);
      } catch (err) {
        console.error('Error fetching tree data: ', err);
      }
    }
  };

  useEffect(() => {
    fetchAndSetTreeData();
  }, [pageOrderData?.childrenIds]);

  useEffect(() => {
    const pageId = pathname?.split('/')[2];
      setTimeout(() => {
        tree?.select(pageId);
      }, 100);
  }, [tree, pathname]);

  return (
    <div className={styles.treeContainer}>
      <FillFlexParent>
        {(dimens) => (
          <Tree
            data={data}
            {...controllers}
            {...dimens}
            // @ts-ignore
            ref={(t) => setTree(t)}
            openByDefault={false}
            disableMultiSelection={true}
            className={styles.tree}
            rowClassName={styles.row}
            padding={15}
            rowHeight={30}
            overscanCount={5}
          >
            {Node}
          </Tree>
        )}
      </FillFlexParent>
    </div>
  );
}

function Node({ node, style, dragHandle }: NodeRendererProps<any>) {
  const router = useRouter();

  const handleClick = () => {
    router.push(`/p/${node.id}`);
  }

  if (node.willReceiveDrop && node.isClosed){
    setTimeout(() => {
      if (node.state.willReceiveDrop) node.open();
    }, 650);
  }

  return (
    <>
      <div
        style={style}
        className={clsx(styles.node, node.state)}
        ref={dragHandle}
        onClick={handleClick}
      >
        <PageArrow node={node} />

        <IconFileDescription size="18px" style={{ marginRight: '4px' }} />

        <span className={styles.text}>
          {node.isEditing ? (
            <Input node={node} />
          ) : (
            node.data.name || 'untitled'
          )}
        </span>

        <div className={styles.actions}>
          <NodeMenu node={node} />
          <CreateNode node={node} />
        </div>
      </div>
    </>
  );
}

function CreateNode({ node }: { node: NodeApi<TreeNode> }) {
  const [tree] = useAtom(treeApiAtom);

  function handleCreate() {
    tree?.create({ type: 'internal', parentId: node.id, index: 0 });
  }

  return (
    <ActionIcon variant="transparent" color="gray" onClick={handleCreate}>
      <IconPlus style={{ width: rem(20), height: rem(20) }} stroke={2} />
    </ActionIcon>
  );
}

function NodeMenu({ node }: { node: NodeApi<TreeNode> }) {
  const [tree] = useAtom(treeApiAtom);

  function handleDelete() {
    tree?.delete(node);
  }

  return (
    <Menu shadow="md" width={200}>
      <Menu.Target>
        <ActionIcon variant="transparent" color="gray">
          <IconDotsVertical
            style={{ width: rem(20), height: rem(20) }}
            stroke={2}
          />
        </ActionIcon>
      </Menu.Target>

      <Menu.Dropdown>
        <Menu.Item
          leftSection={<IconEdit style={{ width: rem(14), height: rem(14) }} />}
          onClick={() => node.edit()}
        >
          Rename
        </Menu.Item>
        <Menu.Item
          leftSection={<IconStar style={{ width: rem(14), height: rem(14) }} />}
        >
          Favorite
        </Menu.Item>

        <Menu.Divider />

        <Menu.Item
          leftSection={<IconLink style={{ width: rem(14), height: rem(14) }} />}
        >
          Copy link
        </Menu.Item>

        <Menu.Item
          leftSection={
            <IconCornerRightUp style={{ width: rem(14), height: rem(14) }} />
          }
        >
          Move
        </Menu.Item>

        <Menu.Divider />
        <Menu.Item
          leftSection={
            <IconArrowsLeftRight style={{ width: rem(14), height: rem(14) }} />
          }
        >
          Archive
        </Menu.Item>
        <Menu.Item
          color="red"
          leftSection={
            <IconTrash style={{ width: rem(14), height: rem(14) }} />
          }
          onClick={() => handleDelete()}
        >
          Delete
        </Menu.Item>
      </Menu.Dropdown>
    </Menu>
  );
}

function PageArrow({ node }: { node: NodeApi<TreeNode> }) {
  return (
    <span onClick={(e) => {
      e.preventDefault();
      e.stopPropagation();
      node.toggle();
    }}>

      {node.isInternal ? (
        node.children && node.children.length > 0 ? (
          node.isOpen ? (
            <IconChevronDown size={18} />
          ) : (
            <IconChevronRight size={18} />
          )
        ) : (
          <IconChevronRight size={18} style={{ visibility: 'hidden' }} />
        )
      ) : null}
    </span>
  );
}

function Input({ node }: { node: NodeApi<TreeNode> }) {
  return (
    <input
      autoFocus
      name="name"
      type="text"
      placeholder="untitled"
      defaultValue={node.data.name}
      onFocus={(e) => e.currentTarget.select()}
      onBlur={() => node.reset()}
      onKeyDown={(e) => {
        if (e.key === 'Escape') node.reset();
        if (e.key === 'Enter') node.submit(e.currentTarget.value);
      }}
    />
  );
}

function convertToTree(pages: IPage[], pageOrder: string[]): TreeNode[] {
  const pageMap: { [id: string]: IPage } = {};
  pages.forEach(page => {
    pageMap[page.id] = page;
  });

  function buildTreeNode(id: string): TreeNode | undefined {
    const page = pageMap[id];
    if (!page) return;

    const node: TreeNode = {
      id: page.id,
      name: page.title,
      children: [],
    };

    if (page.icon) node.icon = page.icon;

    if (page.childrenIds && page.childrenIds.length > 0) {
      node.children = page.childrenIds.map(childId => buildTreeNode(childId)).filter(Boolean) as TreeNode[];
    }

    return node;
  }

  return pageOrder.map(id => buildTreeNode(id)).filter(Boolean) as TreeNode[];
}