import {useDashboardStore} from "@/store/useDashboardStore.jsx";
import VdapApi from "../../hooks/useVdapApi.js";
import useBuildUrl from "../../hooks/useBuildUrl.js";
import { Footprints, Plane, Sailboat, TrendingUp, TrendingDown } from 'lucide-react';
import {Box, Collapsible, Flex, Spinner, Text, Timeline, Center} from "@chakra-ui/react";
import { useMemo, useCallback } from "react";


export default function AlertChanges({ settings, widgetID}) {
  // Find this specific widgets object in the state list of active & displayed widgets
  const thisWidget = useDashboardStore(useCallback((state) =>
    state.widgets.find((widget) => widget.id === widgetID), [widgetID]
  ));

  // build url, default is 7 days past
  const url = useBuildUrl('/api/v2/alert_changes', settings?.startDate, settings?.endDate);

  // call api hook to retrieve data
  const {data: apiData, isLoading, error} = VdapApi(url);

  const data = useMemo(() => {
    if (apiData.length === 0) return [];

    // .reduce() is a built-in array method used to transform an entire array into a single value (like an object)
    // here it returns a single massive object w/ volcano names as keys
    const grouped = apiData.reduce((accumulator, item) => {
      if (!accumulator[item.volcano]) accumulator[item.volcano] = [];
      accumulator[item.volcano].push(item);
      return accumulator;
    }, {});

    // converts the 'grouped' object back into an array of [key, value] pairs
    const group_arr = Object.entries(grouped);

    // sort data newest to oldest within each volcano
    const sorted = group_arr.map((item) =>
      [
        item[0], // volcano name
        [...(item[1])].sort((a, b) =>
          new Date(b.alert_start_date_local) - new Date(a.alert_start_date_local))
      ]
    );

    // volcano with most recent alert level change appears at top of list
    const sorted_entries = [...sorted].sort((a, b) => new Date(b[1][0].alert_start_date_local) - new Date(a[1][0].alert_start_date_local));

    if (thisWidget?.size === "small") {
      return (sorted_entries.map((volcano) => {
        const domain = volcano[1].reduce((acc, curr) => {
          if (!acc[curr.alert_scheme_domain]) acc[curr.alert_scheme_domain] = [];
          acc[curr.alert_scheme_domain].push(curr);
          return acc;
        }, {});

        const domain_arr = Object.entries(domain);
        return [volcano[0], domain_arr];
      }));
    }

    return sorted_entries;
  }, [apiData, thisWidget]);

  // Alert colors are now light/dark mode responsive
  const alertColors = {
    Red: "alertRed",
    Orange: "alertOrange",
    Yellow: "alertYellow",
    Green: "alertGreen",
  };

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

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

  if (data.length === 0) return (
    <Flex w="100%" h="100%" align="center" justify="center" bg="transparent">
      <Text textAlign="center" color="widgetTextMuted">No flight level data available for the selected dates.</Text>
    </Flex>
  );

  return (
    // bg="transparent" to let the glass panel show through
    <Box display="flex" flexDirection="column" gap={2} p={2} w="100%" h="100%" bg="transparent" overflowY="auto">
      {data.map((volcano, index) => {
        if (thisWidget?.size === "large") return (
          <Collapsible.Root key={index} w="100%">
            <Collapsible.Context>
              {(collapsible) => (
                <>
                  <Collapsible.Trigger w="100%">
                    <Flex direction="row"
                          w="100%"
                          justify="space-between" align="center"
                          p={1} pl={3} pr={3}
                          borderTopRadius="lg"
                          borderBottomRadius={collapsible.open ? "0" : "lg"}
                          bg="widgetItemBg"
                    >
                      <Flex direction="column" w="100%" minW={0} textAlign="left">
                        <Text truncate color="text" fontWeight="medium">{volcano[0]}</Text>
                        <Text truncate fontSize="xs" color="widgetTextMuted">{volcano[1][0]?.alert_start_date_local}</Text>
                      </Flex>
                      <Flex w="100%" minW={0} justify="right">
                        <Text truncate pl={2} pr={2} borderRadius="lg" bg="widgetBadgeBg" color="text" fontWeight="semibold">
                          {volcano[1][0]?.alert_level_name}
                        </Text>
                      </Flex>
                    </Flex>
                  </Collapsible.Trigger>

                  <Collapsible.Content w="100%" p={3} borderBottomRadius="lg" bg="widgetItemExpandedBg">
                    <Timeline.Root size="md" variant="subtle">
                      {volcano[1]?.map((object, index) => (
                        <Timeline.Item key={index} w="100%" h="100%">
                          <Timeline.Connector >
                            <Timeline.Indicator outline="none" bg="widgetBadgeBg" color="iconColor" size="lg">
                              {object?.alert_scheme_domain === "terrestrial" && <Footprints size={15} />}
                              {object?.alert_scheme_domain === "aviation" && <Plane size={15} />}
                              {object?.alert_scheme_domain === "maritime" && <Sailboat size={15} />}
                            </Timeline.Indicator>
                            <Timeline.Indicator h="50%" outline="none" bg="widgetBadgeBg" color="iconColor" size="lg">
                              {object?.change_type === "increase" ? <TrendingUp /> : <TrendingDown />}
                            </Timeline.Indicator>
                          </Timeline.Connector>
                          <Timeline.Content w="100%" h="100%">
                            <Timeline.Description w="100%" h="100%" gap={1}>
                              <Flex direction="column" gap={1}>
                                <Text w="100%" h="100%" color="widgetTextMuted">{object?.alert_start_date_local}</Text>
                                <Text w="100%" h="100%"
                                      color={alertColors[object?.alert_level_name] || "text"}
                                      fontSize="md"
                                      fontWeight="semibold"
                                >
                                  {object?.alert_level_name}
                                </Text>
                                <Flex w="100%" h="20px" direction="row" justify="left" align="center">
                                  <Text color="widgetTextMuted">Alert Scale: </Text>
                                  {(Array.from({ length: Number(object?.alert_scheme_highest) - Number(object?.alert_scheme_lowest) + 1}, (v, i) => Number(object?.alert_scheme_lowest) + i))
                                    .map((num) => (
                                      <Center
                                        key={num}
                                        w="20px" h="100%"
                                        color="text"
                                        bg={num === Number(object?.alert_level_rank) ? "widgetBadgeBg" : "transparent"}
                                        borderRadius={num === Number(object?.alert_level_rank) ? "xl" : "none"}
                                        textAlign="center"
                                        fontSize="sm"
                                        fontWeight="bold"
                                      >
                                        {num}
                                      </Center>
                                    ))
                                  }
                                </Flex>
                              </Flex>
                            </Timeline.Description>
                          </Timeline.Content>
                        </Timeline.Item>
                      ))}
                    </Timeline.Root>
                  </Collapsible.Content>
                </>
              )}
            </Collapsible.Context>
          </Collapsible.Root>
        )
        else if (thisWidget?.size === "small") return (
          volcano[1]?.map((domain, index) => (
            <Flex
              key={index}
              direction="row"
              w="100%"
              gap={2}
              justify="space-between" align="center"
              p={1} pl={3} pr={3}
              borderRadius="lg"
              bg="widgetItemBg"
            >
              <Flex direction="column" w="100%" minW={0} textAlign="left" color="text">
                <Flex direction="row" w="100%" gap={2} align="center">
                  <Flex color="iconColor">
                    {domain[0] === "aviation" && <Plane size={15}/>}
                    {domain[0] === "terrestrial" && <Footprints size={15}/>}
                    {domain[0] === "maritime" && <Sailboat size={15}/>}
                  </Flex>
                  <Text truncate fontWeight="medium">{volcano[0] || ""}</Text>
                </Flex>
                <Text truncate w="100%" fontSize="xs" color="widgetTextMuted">{domain[1]?.[0]?.alert_start_date_local || ""}</Text>
              </Flex>

              <Flex direction="row" w="100%" minW={0} justify="right" gap={2} color="text">
                <Flex w="25px" justify="right" color="iconColor">
                  {domain[1]?.[0]?.change_type === "increase" ? <TrendingUp/> : <TrendingDown/>}
                </Flex>
                <Text
                  truncate
                  pl={2} pr={2}
                  borderRadius="lg"
                  bg="widgetBadgeBg"
                  color={alertColors[domain[1]?.[0]?.alert_level_name] || "text"}
                  fontWeight="semibold"
                >
                  {domain[1]?.[0]?.alert_level_name}
                </Text>
              </Flex>
            </Flex>
          ))
        );
      })}
    </Box>
  )
}