import React, { useState } from "react";
import { useSnapshot } from "valtio";

import { useTheme } from "next-themes";
import { useRouter } from "next/router";
import NextLink from "next/link";
import ReactTimeAgo from "react-time-ago";
import filesize from "filesize";

import Box from "./Box";
import Container from "./Container";
import state from "../state";
import wat from "../utils/wat-highlight";

import EditorNavigation from "./EditorNavigation";
import { Button, Text, Link, Flex, Tabs, Tab } from ".";
import Monaco from "./Monaco";

const FILESIZE_BREAKPOINTS: [number, number] = [2 * 1024, 5 * 1024];

const DeployEditor = () => {
  const snap = useSnapshot(state);
  const router = useRouter();
  const { theme } = useTheme();

  const [showContent, setShowContent] = useState(false);

  const compiledFiles = snap.files.filter(file => file.compiledContent);
  const activeFile = compiledFiles[snap.activeWat];

  const renderNav = () => (
    <Tabs
      activeIndex={snap.activeWat}
      onChangeActive={idx => (state.activeWat = idx)}
    >
      {compiledFiles.map((file, index) => {
        return <Tab key={file.name} header={`${file.name}.wat`} />;
      })}
    </Tabs>
  );

  const compiledSize = activeFile?.compiledContent?.byteLength || 0;
  const color =
    compiledSize > FILESIZE_BREAKPOINTS[1]
      ? "$error"
      : compiledSize > FILESIZE_BREAKPOINTS[0]
      ? "$warning"
      : "$success";

  const isContentChanged =
    activeFile && activeFile.compiledValueSnapshot !== activeFile.content;
  // const hasDeployErrors = activeFile && activeFile.containsErrors;

  const CompiledStatView = activeFile && (
    <Flex
      column
      align="center"
      css={{
        fontSize: "$sm",
        fontFamily: "$monospace",
        textAlign: "center",
      }}
    >
      <Flex row align="center">
        <Text css={{ mr: "$1" }}>
          Compiled {activeFile.name.split(".")[0] + ".wasm"}
        </Text>
        {activeFile?.lastCompiled && (
          <ReactTimeAgo date={activeFile.lastCompiled} locale="en-US" />
        )}

        {activeFile.compiledContent?.byteLength && (
          <Text css={{ ml: "$2", color }}>
            ({filesize(activeFile.compiledContent.byteLength)})
          </Text>
        )}
      </Flex>
      {activeFile.compiledContent?.byteLength &&
        activeFile.compiledContent?.byteLength >= 64000 && (
          <Flex css={{ flexDirection: "column", py: "$3", pb: "$1" }}>
            <Text css={{ ml: "$2", color: "$error" }}>
              File size is larger than 64kB, cannot set hook!
            </Text>
          </Flex>
        )}
      <Button variant="link" onClick={() => setShowContent(true)}>
        View as WAT-file
      </Button>
      {isContentChanged && (
        <Text warning>
          File contents were changed after last compile, compile again to
          incorporate your latest changes in the build.
        </Text>
      )}
    </Flex>
  );
  const NoContentView = !snap.loading && router.isReady && (
    <Text
      css={{
        mt: "-60px",
        fontSize: "$sm",
        fontFamily: "$monospace",
        maxWidth: "300px",
        textAlign: "center",
      }}
    >
      {`You haven't compiled any files yet, compile files on `}
      <NextLink shallow href={`/develop/${router.query.slug}`} passHref>
        <Link as="a">develop view</Link>
      </NextLink>
    </Text>
  );

  const isContent =
    snap.files?.filter(file => file.compiledWatContent).length > 0 &&
    router.isReady;
  return (
    <Box
      css={{
        flex: 1,
        display: "flex",
        position: "relative",
        flexDirection: "column",
        backgroundColor: "$mauve2",
        width: "100%",
      }}
    >
      <EditorNavigation renderNav={renderNav} />
      <Container
        css={{
          display: "flex",
          flex: 1,
          justifyContent: "center",
          alignItems: "center",
        }}
      >
        {!isContent ? (
          NoContentView
        ) : !showContent ? (
          CompiledStatView
        ) : (
          <Monaco
            className="hooks-editor"
            defaultLanguage={"wat"}
            language={"wat"}
            path={`file://tmp/c/${activeFile?.name}.wat`}
            value={activeFile?.compiledWatContent || ""}
            beforeMount={monaco => {
              monaco.languages.register({ id: "wat" });
              monaco.languages.setLanguageConfiguration("wat", wat.config);
              monaco.languages.setMonarchTokensProvider("wat", wat.tokens);
            }}
            onMount={editor => {
              editor.updateOptions({
                glyphMargin: true,
                readOnly: true,
              });
            }}
            theme={theme === "dark" ? "dark" : "light"}
            overlay={
              <Flex
                css={{
                  m: "$1",
                  ml: "auto",
                  fontSize: "$sm",
                  color: "$textMuted",
                }}
              >
                <Link onClick={() => setShowContent(false)}>
                  Exit editor mode
                </Link>
              </Flex>
            }
          />
        )}
      </Container>
    </Box>
  );
};

export default DeployEditor;