import {Flex, Button, Spinner, Text} from "@chakra-ui/react";
import useBuildUrl from "../../hooks/useBuildUrl.js";
import VdapApi from '../../hooks/useVdapApi.js';
import { useRef, useEffect } from 'react';
import {useDashboardStore} from "../../store/useDashboardStore.jsx";

export default function CommCoorReport({ settings, widgetID }) {
  const reportRef = useRef(null);

  const updateSettings = useDashboardStore(state => state.updateWidgetSettings);

  // build url, defaults to 7 days past
  const url = useBuildUrl('/api/v2/comm_coor_report', settings?.startDate, settings?.endDate);
  console.log(url);

  // VdapApi hook only calls api if the url changes and apiData remains stable since vdapApi uses state to track the data
  const {data: apiData, isLoading, error} = VdapApi(url);
  console.log(apiData);

  const handleDownloadReport = () => {
    if (apiData.length === 0) return;
    const element = document.createElement('a');
    element.style.display = 'none';
    // Appends HTML right inside the element, after its last child
    element.insertAdjacentHTML('afterbegin', apiData?.report_html);

    // 1. Create a blob object with text content and text/plain mime type
    const blob = new Blob([element.textContent || ""], { type: 'text/plain' });

    // 2. Generate a temporary URL pointing to that blob
    const fileUrl = URL.createObjectURL(blob);

    // 3. Create a hidden anchor element
    const linkElement = document.createElement('a');
    linkElement.href = fileUrl;
    linkElement.download = `comm_coor_report_${apiData?.start_date}_${apiData?.end_date}`; // Sets the target file name
    linkElement.style.display = 'none';

    // 4. Append to body, trigger click, and remove it immediately
    document.body.appendChild(linkElement);
    linkElement.click();
    document.body.removeChild(linkElement);
    document.body.removeChild(element);

    // 5. Free up memory by revoking the blob URL
    URL.revokeObjectURL(fileUrl);
  }

  const handleCopyReport = () => {
    if (apiData.length === 0) return;
    const element = document.createElement('a');
    element.style.display = 'none';
    // Appends HTML right inside the element, after its last child
    element.insertAdjacentHTML('afterbegin', apiData?.report_html);

    navigator.clipboard.writeText(element.textContent || "")
      .then(() => {
        alert('Copied to clipboard!');
      })
      .catch((err => {
        console.error('Failed to copy: ', err);
      }));

    document.body.removeChild(element);
  }

  useEffect(() => {
    if (reportRef.current) {
      reportRef.current.innerHTML = apiData?.report_html;
      const p = reportRef.current.querySelectorAll('p');
      const b = reportRef.current.querySelectorAll('b');
      p[0].remove();
      b[0].remove();
    }
  }, [apiData]);

  // copy data to clipboard in formatted way when user clicks on copy btn in widget settings
  useEffect(() => {
    if (settings?.copyToClipboard === true && reportRef.current) {
      navigator.clipboard.writeText(reportRef.current.innerText)
        .then(() => {
          alert('Copied to clipboard!');
        })
        .catch((err => {
          console.error('Failed to copy: ', err);
        }));
      updateSettings(widgetID, {copyToClipboard: false});
    }
  }, [settings, widgetID, updateSettings]);

  // download report
  useEffect(() => {
    if (settings?.downloadReport === true && reportRef.current) {
      // 1. Create a blob object with text content and text/plain mime type
      const blob = new Blob([reportRef.current.innerText || ""], { type: 'text/plain' });

      // 2. Generate a temporary URL pointing to that blob
      const fileUrl = URL.createObjectURL(blob);

      // 3. Create a hidden anchor element
      const linkElement = document.createElement('a');
      linkElement.href = fileUrl;
      linkElement.download = `comm_coor_report_${apiData?.start_date}_${apiData?.end_date}`; // Sets the target file name
      linkElement.style.display = 'none';

      // 4. Append to body, trigger click, and remove it immediately
      document.body.appendChild(linkElement);
      linkElement.click();
      document.body.removeChild(linkElement);

      // 5. Free up memory by revoking the blob URL
      URL.revokeObjectURL(fileUrl);
      updateSettings(widgetID, {downloadReport: false});
    }
  }, [settings, widgetID, updateSettings, apiData]);

  if (isLoading) return (
    <Flex w="100%" h="100%" align="center" justify="center" borderRadius="lg" bg="gray.800">
      <Spinner size="xl" color="blue.400" thickness="4px"/>
    </Flex>
  );

  if (error) return (
    <Flex w="100%" h="100%" align="center" justify="center" textAlign="center" borderRadius="lg" bg="gray.800">
      <Text color="red.400">{error}</Text>
    </Flex>
  );

  if (!apiData) return (
    <Flex w="100%" h="100%" align="center" justify="center" borderRadius="lg" bg="gray.800">
      <Text textAlign="center" color="gray.400">No data</Text>
    </Flex>
  );

  return (
    <Flex direction="row" w="100%" h="100%" p={1} overflowY="auto">
      <Text ref={reportRef}></Text>
    </Flex>
  )
}