import { useEffect, useState, useRef, useMemo } from "react";
import { useParams, useNavigate } from "react-router-dom";
import { debounce, Dictionary, omit } from 'lodash';
import YAML from "yaml";
import { PlusIcon } from "@heroicons/react/solid";
import { IProjectPayload, IClientNodeItem, IServiceNodePosition } from "../../types";
import eventBus from "../../events/eventBus";
import { useProject, useUpdateProject } from "../../hooks/useProject";
import useWindowDimensions from "../../hooks/useWindowDimensions";
import { projectHttpCreate } from "../../services/project";
import { flattenGraphData } from "../../utils/generators";
import { nodeLibraries } from "../../utils/data/libraries";
import {
  getClientNodeItem,
  flattenLibraries,
  ensure,
  getClientNodesAndConnections,
  getMatchingSetIndex
} from "../../utils";
import { checkHttpStatus } from "../../services/helpers";
import { generateHttp } from "../../services/generate";
import { Canvas } from "../Canvas";
import Spinner from "../Spinner";
import ModalConfirmDelete from "../Modal/Service/ConfirmDelete";
import ModalServiceCreate from "../Modal/Service/Create";
import ModalServiceEdit from "../Modal/Service/Edit";
import CodeEditor from "../CodeEditor";

interface IProjectProps {}

export default function Project(props: IProjectProps) {
  const navigate = useNavigate();
  const { uuid } = useParams<{ uuid: string }>();
  const { height } = useWindowDimensions();
  const { data, error, isFetching } = useProject(uuid);
  const mutation = useUpdateProject(uuid);
  const stateNodesRef = useRef<Dictionary<IClientNodeItem>>();
  const stateConnectionsRef = useRef<[[string, string]] | []>();

  const [generatedCode, setGeneratedCode] = useState<string>();
  const [formattedCode, setFormattedCode] = useState<string>("");
  const [showModalCreateService, setShowModalCreateService] = useState(false);
  const [showVolumesModal, setShowVolumesModal] = useState(false);
  const [showNetworksModal, setShowNetworksModal] = useState(false);
  const [nodeForEdit, setNodeForEdit] = useState<IClientNodeItem | null>(null);
  const [nodeForDelete, setNodeForDelete] = useState<IClientNodeItem | null>(null);
  const [language, setLanguage] = useState("yaml");
  const [copyText, setCopyText] = useState("Copy");
  const [nodes, setNodes] = useState({});
  const [connections, setConnections] = useState<[[string, string]] | []>([]);  
  const [projectName, setProjectName] = useState("Untitled");
  const [canvasPosition, setCanvasPosition] = useState({top: 0, left: 0, scale: 1});

  stateNodesRef.current = nodes;
  stateConnectionsRef.current = connections;

  const handleNameChange = (e: any) => {
    setProjectName(e.target.value);
  }

  const createProject = (payload: IProjectPayload) => {
    projectHttpCreate(JSON.stringify(payload))
      .then(checkHttpStatus)
      .then(data => {
        navigate(`/projects/${data.uuid}`);
      })
      .catch(err => {})
      .finally(() => {
      })
  }

  const onNodeUpdate = (positionData: IServiceNodePosition) => {
    if (stateNodesRef.current) {
      const node = { ...stateNodesRef.current[positionData.key], ...positionData };
      setNodes({ ...stateNodesRef.current, [positionData.key]: node });
    }
  }

  const onSave = () => {
    const payload: IProjectPayload = {
      name: projectName,
      data: {
        canvas: {
          position: canvasPosition,
          nodes: nodes,
          connections: connections
        },
        configs: [],
        networks: [],
        secrets: [],
        services: nodes,
        version: 3,
        volumes: []
      }
    }

    if (uuid) {
      mutation.mutate(payload);
    } else {
      createProject(payload);
    }
  }

  const setViewHeight = () => {
    let vh = window.innerHeight * 0.01;
    document.documentElement.style.setProperty("--vh", `${vh}px`);
  }

  const copy = () => {
    navigator.clipboard.writeText(formattedCode);
    setCopyText("Copied");

    setTimeout(() => {
      setCopyText("Copy");
    }, 300);
  }

  useEffect(() => {
    if (!data) {
      return;
    }

    console.log(data);

    const canvasData = JSON.parse(data.data);
    const nodesAsList = Object.keys(canvasData.canvas.nodes).map(k => canvasData.canvas.nodes[k]);
    const clientNodeItems = getClientNodesAndConnections(nodesAsList, nodeLibraries);

    setProjectName(data.name);
    setNodes(clientNodeItems);
    setConnections(canvasData.canvas.connections);
    setCanvasPosition(canvasData.canvas.position);
  }, [data]);

  const debouncedOnCodeChange = useMemo(() => debounce((code: string) => {
    //formik.setFieldValue("code", e, false);
  }, 700), []);

  const debouncedOnGraphUpdate = useMemo(() => debounce((graphData) => {
    const flatData = flattenGraphData(graphData);
    generateHttp(flatData)
      .then(checkHttpStatus)
      .then(data => {
        if (data['code'].length) {
          for (var i = 0; i < data['code'].length; ++i) {
            data['code'][i] = data['code'][i].replace(/(\r\n|\n|\r)/gm, "");
          }

          const code = data['code'].join("\n");
          setGeneratedCode(code);
        }
      })
      .catch(err => {

      })
      .finally(() => {

      });
  }, 450), []);

  const onCodeUpdate = (code: string) => {
    debouncedOnCodeChange(code);
  };

  const onGraphUpdate = (graphData: any) => {
    debouncedOnGraphUpdate(graphData);
  };

  const onCanvasUpdate = (updatedCanvasPosition: any) => {
    setCanvasPosition({...canvasPosition, ...updatedCanvasPosition});
  };

  useEffect(() => {
    const handler = () => {
      setViewHeight();
    }

    window.addEventListener("resize", handler);
    setViewHeight();

    return () => {
      window.removeEventListener("resize", handler);
    }
  }, []);

  const onAddEndpoint = (values: any) => {
    let sections = flattenLibraries(nodeLibraries);
    let clientNodeItem = getClientNodeItem(values, ensure(sections.find((l) => l.Type === values.type)));
    clientNodeItem.position = { left: 60, top: 30 };
    setNodes({ ...nodes, [clientNodeItem.key]: clientNodeItem });
  }

  const onUpdateEndpoint = (nodeItem: IClientNodeItem) => {
    setNodes({ ...nodes, [nodeItem.key]: nodeItem });
  }

  const onConnectionDetached = (data: any) => {
    if (!stateConnectionsRef.current || stateConnectionsRef.current.length <= 0) {
      return;
    }

    const _connections: [[string, string]] = [...stateConnectionsRef.current] as any;
    const existingIndex = getMatchingSetIndex(_connections, data);

    if (existingIndex !== -1) {
      _connections.splice(existingIndex, 1);
    }

    setConnections(_connections);
  }

  const onConnectionAttached = (data: any) => {
    if (stateConnectionsRef.current && stateConnectionsRef.current.length > 0) {
      const _connections: [[string, string]] = [...stateConnectionsRef.current] as any;
      const existingIndex = getMatchingSetIndex(_connections, data);
      if (existingIndex === -1) {
        _connections.push(data);
      }
      setConnections(_connections);
    } else {
     setConnections([data]);
    }
  }

  const onRemoveEndpoint = (node: IClientNodeItem) => {
    setNodes({ ...omit(nodes, node.key) });
    eventBus.dispatch("NODE_DELETED", { message: { "node": node } });
  }

  useEffect(() => {
    if (!generatedCode) {
      return;
    }

    if (language === "json") {
      setFormattedCode(JSON.stringify(YAML.parse(generatedCode), null, 2));
    }

    if (language === "yaml") {
      setFormattedCode(generatedCode);
    }
  }, [language, generatedCode]);

  useEffect(() => {

  }, [nodeForEdit]);

  if (!isFetching) {
    return (
      <>
        {showModalCreateService
          ? <ModalServiceCreate
            onHide={() => setShowModalCreateService(false)}
            onAddEndpoint={(values: any) => onAddEndpoint(values)}
          />
          : null
        }

        {nodeForEdit
          ? <ModalServiceEdit
            node={nodeForEdit}
            onHide={() => setNodeForEdit(null)}
            onUpdateEndpoint={(values: any) => onUpdateEndpoint(values)}
          />
          : null
        }

        {nodeForDelete
          ? <ModalConfirmDelete
            onHide={() => setNodeForDelete(null)}
            onConfirm={() => {
              onRemoveEndpoint(nodeForDelete);
              setNodeForDelete(null);
            }}
          />
          : null
        }

        <div className="px-4 py-3 border-b border-gray-200">
          <form
            className="flex flex-col space-y-2 md:flex-row md:justify-between items-center"
            autoComplete="off"
          >
            <input
              className={`
                bg-gray-100
                appearance-none
                w-full
                md:w-1/2
                lg:w-1/3
                block
                text-gray-700
                border
                border-gray-100
                dark:bg-gray-900
                dark:text-white
                dark:border-gray-900
                rounded
                py-2
                px-3
                leading-tight
                focus:outline-none
                focus:border-indigo-400
                focus:ring-0
              `}
              type="text"
              placeholder="Untitled"
              autoComplete="off"
              id="name"
              name="name"
              onChange={handleNameChange}
              value={projectName}
            />

            <div className="flex flex-col space-y-2 w-full justify-end mb-4  md:flex-row md:space-y-0 md:space-x-2 md:mb-0">
              <button
                onClick={() => {
                  window.location.replace("/projects/new")
                }}
                type="button"
                className="btn-util text-black bg-gray-200 hover:bg-gray-300 sm:w-auto"
              >
                <div className="flex justify-center items-center space-x-2 mx-auto">
                  <span>New</span>
                </div>
              </button>

              <button
                onClick={() => onSave()}
                type="button"
                className="btn-util text-white bg-green-600 hover:bg-green-700 sm:w-auto"
              >
                <div className="flex justify-center items-center space-x-2 mx-auto">
                  {mutation.isLoading && <Spinner className="w-4 h-4 text-green-300" />}
                  <span>Save</span>
                </div>
              </button>
            </div>
          </form>
        </div>

        <div className="flex flex-grow relative flex-col md:flex-row">
          <div className="w-full overflow-hidden md:w-2/3 z-40" style={{ height: height }}>
            <div className="relative h-full">
              <div className="absolute top-0 right-0 z-40">
                <div className="flex space-x-2 p-2">
                  <button className="flex space-x-1 btn-util" type="button" onClick={() => setShowModalCreateService(true)}>
                    <PlusIcon className="w-3" />
                    <span>Service</span>
                  </button>
                  <button className="btn-util" type="button" onClick={() => setShowVolumesModal(true)}>
                    Volumes
                  </button>
                  <button className="btn-util" type="button" onClick={() => setShowNetworksModal(true)}>
                    Networks
                  </button>
                </div>
              </div>

              <Canvas
                nodes={nodes}
                connections={connections}
                canvasPosition={canvasPosition}
                onNodeUpdate={(node: IServiceNodePosition) => onNodeUpdate(node)}
                onGraphUpdate={(graphData: any) => onGraphUpdate(graphData)}
                onCanvasUpdate={(canvasData: any) => onCanvasUpdate(canvasData)}
                onConnectionAttached={(connectionData: any) => onConnectionAttached(connectionData)}
                onConnectionDetached={(connectionData: any) => onConnectionDetached(connectionData)}
                setNodeForEdit={(node: IClientNodeItem) => setNodeForEdit(node)}
                setNodeForDelete={(node: IClientNodeItem) => setNodeForDelete(node)}
              />
            </div>
          </div>
          <div className="relative group code-column w-full md:w-1/3">
            <div className={`absolute top-0 left-0 right-0 z-10 flex justify-end p-1 space-x-2 group-hover:visible invisible`}>
              <button className={`btn-util ${language === "json" ? `btn-util-selected` : ``}`} onClick={() => setLanguage('json')}>json</button>
              <button className={`btn-util ${language === "yaml" ? `btn-util-selected` : ``}`} onClick={() => setLanguage('yaml')}>yaml</button>
              <button className="btn-util" type="button" onClick={copy}>{copyText}</button>
            </div>

            <CodeEditor
              data={formattedCode}
              language={language}
              onChange={(e: any) => { onCodeUpdate(e) }}
              disabled={false}
              lineWrapping={false}
              height={height - 64}
            />
          </div>
        </div>
      </>
    )
  }

  return (
    <div className="flex items-center justify-center items-stretch min-h-screen align-middle">
      <Spinner className="w-4 h-4 m-auto dark:text-blue-400 text-blue-600"></Spinner>
    </div>
  );
}