import { ActionIcon, Badge, Box, Card, Divider, FloatingIndicator, Group, LoadingOverlay, Space, Stack, Switch, Table, Tabs, TextInput, ThemeIcon, Title, Tooltip, useMantineTheme } from "@mantine/core"
import { useEffect, useState } from "react";
import { BsPlusLg, BsTrashFill } from "react-icons/bs"
import { rem } from '@mantine/core';
import { ActionType, Protocol, Rule, RuleMode, Table as NFTables, firewall, firewallRulesQuery } from "../../components/Firewall/utils";
import { errorNotify, getErrorMessage, isMediumScreen, makeid, okNotify } from "../../js/utils";
import { useListState, useMediaQuery } from '@mantine/hooks';
import { DragDropContext, Droppable, Draggable } from '@hello-pangea/dnd';
import { TbGripVertical, TbReload } from "react-icons/tb";
import { useQueryClient } from "@tanstack/react-query";
import { TiTick } from "react-icons/ti";
import YesNoModal from "../../components/YesNoModal";
import { PortRangeInput } from "../../components/PortInput";
import { InterfaceInput } from "../../components/InterfaceInput";
import { ActionTypeSelector } from "../../components/Firewall/ActionTypeSelector";
import { ProtocolSelector } from "../../components/Firewall/ProtocolSelector";
import { ModeSelector } from "../../components/Firewall/ModeSelector";
import { OnOffButton } from "../../components/OnOffButton";
import { LuArrowBigRightDash } from "react-icons/lu"
import { ImCheckmark, ImCross } from "react-icons/im";
import { IoSettingsSharp } from "react-icons/io5";
import { SettingsModal } from "./SettingsModal";
import { FaDirections } from "react-icons/fa";
import { PiWallLight } from "react-icons/pi";
import { DocsButton } from "../../components/DocsButton";

export const Firewall = () => {

  const [currentPolicy, setCurrentPolicy] = useState<ActionType>(ActionType.ACCEPT)
  const queryClient = useQueryClient()
  const rules = firewallRulesQuery()
  const [state, handlers] = useListState<Rule & { rule_id: string }>([]);
  const [enableFwModal, setEnableFwModal] = useState(false)
  const [applyChangeModal, setApplyChangeModal] = useState(false)
  const [settingsModal, setSettingsModal] = useState(false)
  const theme = useMantineTheme();
  const isMedium = useMediaQuery(`(min-width: 950px)`) ?? true

  const [updateMevalueinternal, internalUpdateme] = useState(false)
  const updateMe = () => {
    internalUpdateme(!updateMevalueinternal)
  }

  useEffect(() => {
    if (rules.isError)
      errorNotify("Firewall Update failed!", getErrorMessage(rules.error))
  }, [rules.isError])

  useEffect(() => {
    if (!rules.isLoading && rules.isFetched && !rules.isFetching) {
      setCurrentPolicy(rules.data?.policy ?? ActionType.ACCEPT)
      handlers.setState(JSON.parse(JSON.stringify((rules.data?.rules ?? []).map(v => ({ rule_id: makeid(30), ...v })))))
    }
  }, [rules.isFetched, rules.isLoading, rules.isFetching])

  const fwEnabled = rules.data?.enabled ?? false
  const valuesChanged = JSON.stringify(rules.data?.rules) != JSON.stringify(state.map(v => {
    const { rule_id, ...rest } = v
    return rest
  })) || rules.data?.policy != currentPolicy
  const [selectedTab, setSelectedTab] = useState<NFTables>(NFTables.FILTER)


  const enableFirewall = () => {
    if (valuesChanged) {
      applyChangesRaw().then(() => enableFirewallRaw())
    } else {
      enableFirewallRaw()
    }
  }

  const enableFirewallRaw = () => {
    return firewall.enable()
      .then(() => okNotify("Firewall enabled", "The firewall has been enabled"))
      .catch((e) => errorNotify("Firewall enable failed!", getErrorMessage(e)))
  }

  const disableFirewallRaw = () => {
    return firewall.disable()
      .then(() => okNotify("Firewall disabled", "The firewall has been disabled"))
      .catch((e) => errorNotify("Firewall disable failed!", getErrorMessage(e)))
  }

  const switchState = () => {
    if (fwEnabled)
      disableFirewallRaw()
    else
      if ([ActionType.REJECT, ActionType.DROP].includes(currentPolicy) || valuesChanged) {
        setEnableFwModal(true)
      } else {
        enableFirewall()
      }
  }

  const applyChanges = () => {
    if (fwEnabled && rules.data?.policy == ActionType.ACCEPT && [ActionType.REJECT, ActionType.DROP].includes(currentPolicy)) {
      setApplyChangeModal(true)
    } else {
      applyChangesRaw()
    }
  }

  const emptyRuleAdd = () => {
    handlers.insert(0, {
      rule_id: makeid(30),
      active: true,
      name: "Rule name",
      proto: Protocol.TCP,
      src: "",
      dst: "",
      port_src_from: 1,
      port_dst_from: 8080,
      port_src_to: 65535,
      port_dst_to: 8080,
      action: ActionType.ACCEPT,
      mode: RuleMode.IN,
      table: selectedTab
    })
  }

  const parseRules = () => {
    return state
  }

  const applyChangesRaw = () => {
    const parsedRules = parseRules()
    if (parsedRules === undefined) {
      errorNotify("Firewall rules apply failed!", "The firewall rules are not valid")
      return Promise.reject()
    } else {
      return firewall.ruleset({ rules: state, policy: currentPolicy })
        .then(() => okNotify("Firewall rules applied", "The firewall rules has been applied"))
        .catch((e) => errorNotify("Firewall rules apply failed!", getErrorMessage(e)))
    }
  }



  // Draggable indexes must be contiguous inside a Droppable, so the visible rules are
  // re-indexed for the tab while keeping their position in `state` for the actual edits.
  const visibleRules = state
    .map((item, index) => ({ item, index }))
    .filter(({ item }) => item.table == selectedTab)

  const items = visibleRules.map(({ item, index }, visibleIndex) => (
    <Draggable key={item.rule_id} index={visibleIndex} draggableId={item.rule_id}>
      {(provided, snapshot) => {
        const customInt = [
          { value: "0.0.0.0/0", netint: "ANY IPv4", label: "0.0.0.0/0" },
          { value: "::/0", netint: "ANY IPv6", label: "::/0" },
          { value: "", netint: "ANY", label: "ANY" }
        ]
        const src_custom_int = customInt.map(v => v.value).includes(item.src) ? [] : [{ value: item.src, netint: "SELECTED", label: item.src }]
        const dst_custom_int = customInt.map(v => v.value).includes(item.dst) ? [] : [{ value: item.dst, netint: "SELECTED", label: item.dst }]
        const [srcPortEnabled, setSrcPortEnabled] = useState(item.port_src_from != 1 || item.port_src_to != 65535)
        const [dstPortEnabled, setDstPortEnabled] = useState(item.port_dst_from != 1 || item.port_dst_to != 65535)
        const [srcPortValue, setSrcPortValue] = useState(item.port_src_from == item.port_src_to ? `${item.port_src_from}` : `${item.port_src_from}-${item.port_src_to}`)
        const [dstPortValue, setDstPortValue] = useState(item.port_dst_from == item.port_dst_to ? `${item.port_dst_from}` : `${item.port_dst_from}-${item.port_dst_to}`)

        const port_range_setter = (rule: Rule, v: string, { src = false, dst = false }: { src?: boolean, dst?: boolean }) => {
          const elements = v.split("-")
          const values = [elements[0] ? parseInt(elements[0]) : 0, elements[1] ? parseInt(elements[1]) : 0]
          values[1] = values[1] ? values[1] : values[0]
          if (src) {
            rule.port_src_from = values[0]
            rule.port_src_to = values[1]
            setSrcPortValue(v)
          }
          if (dst) {
            rule.port_dst_from = values[0]
            rule.port_dst_to = values[1]
            setDstPortValue(v)
          }
          updateMe()
        }

        const ip_setter = (rule: Rule, v: string | null, { src = false, dst = false }: { src?: boolean, dst?: boolean }) => {
          const values = v ? v : ""
          if (src) {
            rule.src = values
          }
          if (dst) {
            rule.dst = values
          }
          updateMe()
        }

        const proto_any = item.proto == Protocol.ANY
        const disabletab = {
          port_box: proto_any,
          src_port: !srcPortEnabled || proto_any,
          dst_port: !dstPortEnabled || proto_any
        }

        return <Card
          ref={provided.innerRef}
          {...provided.draggableProps}
          withBorder
          radius="md"
          p="md"
          mb="md"
          w="100%"
          bg="transparent"
          style={{
            transition: 'border-color 0.2s ease',
            // dnd puts the drag transform/transition in here: it has to win over our defaults
            ...provided.draggableProps.style,
            borderColor: snapshot.isDragging ? 'var(--accent-color)' : 'var(--fourth_color)',
          }}
        >
          <Group wrap="nowrap" align="flex-start" gap="sm">
            <Box {...provided.dragHandleProps} style={{ display: 'flex', alignItems: 'center', height: rem(36) }}>
              <TbGripVertical style={{ width: rem(20), height: rem(20), color: 'var(--text-secondary)' }} />
            </Box>
            <Stack gap="sm" style={{ flex: 1, minWidth: 0 }}>
              <Group wrap="nowrap" gap="sm">
                <Switch
                  checked={item.active}
                  onChange={() => {
                    item.active = !item.active
                    updateMe()
                  }}
                  color="teal"
                  size="lg"
                  thumbIcon={
                    item.active ? (
                      <ImCheckmark
                        style={{ width: rem(12), height: rem(12) }}
                        color={theme.colors.teal[6]}
                      />
                    ) : (
                      <ImCross
                        style={{ width: rem(12), height: rem(12) }}
                        color={theme.colors.red[6]}
                      />
                    )
                  }
                />
                <ActionIcon color="red" onClick={() => handlers.remove(index)} size="lg" radius="md" variant="filled"><BsTrashFill size={18} /></ActionIcon>
                <TextInput defaultValue={item.name} onChange={(v) => { item.name = v.target.value; updateMe() }} style={{ flex: 1 }} />
              </Group>

              <Group wrap={isMedium ? "nowrap" : "wrap"} align="flex-start" gap="md">
                <Stack gap="xs" style={{ flex: 1, minWidth: isMedium ? 0 : "100%" }}>
                  <InterfaceInput
                    initialCustomInterfaces={[...src_custom_int, ...customInt]}
                    value={item.src}
                    onChange={v => ip_setter(item, v, { src: true })}
                    includeInterfaceNames
                  />
                  <Group gap="xs" wrap="nowrap">
                    <OnOffButton value={srcPortEnabled} onClick={() => {
                      const value = !srcPortEnabled
                      setSrcPortEnabled(value)
                      if (!value) {
                        item.port_src_from = 1
                        item.port_src_to = 65535
                        updateMe()
                      } else {
                        port_range_setter(item, srcPortValue, { src: true })
                      }
                    }} size="lg" disabled={disabletab.port_box} variant="light" />
                    <PortRangeInput
                      onChange={v => port_range_setter(item, v.target.value, { src: true })}
                      value={srcPortValue}
                      disabled={disabletab.src_port}
                      error={!disabletab.src_port && !srcPortValue}
                      style={{ flex: 1 }}
                    />
                  </Group>
                </Stack>

                <Box style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', alignSelf: isMedium ? 'stretch' : 'center', padding: isMedium ? '28px 0 0' : '4px 0' }}>
                  <LuArrowBigRightDash size={22} color="var(--text-secondary)" style={isMedium ? undefined : { transform: 'rotate(90deg)' }} />
                </Box>

                <Stack gap="xs" style={{ flex: 1, minWidth: isMedium ? 0 : "100%" }}>
                  <InterfaceInput
                    initialCustomInterfaces={[...dst_custom_int, ...customInt]}
                    defaultValue={item.dst}
                    onChange={v => ip_setter(item, v, { dst: true })}
                    includeInterfaceNames
                  />
                  <Group gap="xs" wrap="nowrap">
                    <OnOffButton value={dstPortEnabled} onClick={() => {
                      const value = !dstPortEnabled
                      setDstPortEnabled(value)
                      if (!value) {
                        item.port_dst_from = 1
                        item.port_dst_to = 65535
                        updateMe()
                      } else {
                        port_range_setter(item, dstPortValue, { dst: true })
                      }
                    }} size="lg" disabled={disabletab.port_box} variant="light" />
                    <PortRangeInput
                      onChange={v => port_range_setter(item, v.target.value, { dst: true })}
                      value={dstPortValue}
                      disabled={disabletab.dst_port}
                      error={!disabletab.dst_port && !dstPortValue}
                      style={{ flex: 1 }}
                    />
                  </Group>
                </Stack>
              </Group>

              <Group gap="xs" wrap="wrap">
                <ModeSelector
                  value={item.mode}
                  onChange={(value) => { item.mode = value as RuleMode; updateMe() }}
                  style={{ flexGrow: 1, minWidth: rem(160) }}
                  table={item.table}
                />
                <ProtocolSelector
                  value={item.proto}
                  onChange={(value) => { item.proto = value as Protocol; updateMe() }}
                  style={{ flexGrow: 1, minWidth: rem(160) }}
                />
                <ActionTypeSelector
                  value={item.action}
                  onChange={(value) => { item.action = value as ActionType; updateMe() }}
                  style={{ flexGrow: 1, minWidth: rem(160) }}
                />
              </Group>
            </Stack>
          </Group>
        </Card>
      }}
    </Draggable>
  ));


  return <>
    <Space h="sm" />
    <LoadingOverlay visible={rules.isLoading} />
    <Box className={isMedium ? 'center-flex' : 'center-flex-row'}>
      <Title order={5} className="center-flex"><ThemeIcon radius="md" size="md" variant='filled' color='red' ><PiWallLight size={20} /></ThemeIcon><Space w="xs" />Firewall Rules</Title>
      {isMedium ? <Box className='flex-spacer' /> : <Space h="sm" />}
      <Box className='center-flex'>
        Enabled: <Space w="sm" /> <Switch checked={fwEnabled} onChange={switchState} />
        <Space w="sm" />
        Policy:
        <Space w="xs" />
        <ActionTypeSelector
          value={currentPolicy}
          onChange={(value) => setCurrentPolicy(value as ActionType)}
        />
      </Box>
      {isMedium ? <Box className='flex-spacer' /> : <Space h="sm" />}
      <Box className='center-flex'>
        <Space w="xs" />
        <Tooltip label="Total number of firewall rules configured" position="bottom" color="green">
          <Badge size="md" radius="sm" color="green" variant="filled"><FaDirections style={{ marginBottom: -1, marginRight: 4 }} />Rules: {rules.isLoading ? 0 : rules.data?.rules.length}</Badge>
        </Tooltip>
        <Space w="md" />
        <Tooltip label="Add a new rule" position='bottom' color="blue">
          <ActionIcon color="blue" onClick={emptyRuleAdd} size="lg" radius="md" variant="filled"><BsPlusLg size={18} /></ActionIcon>
        </Tooltip>
        <Space w="xs" />
        <Tooltip label="Refresh" position='bottom' color="indigo">
          <ActionIcon color="indigo" onClick={() => queryClient.invalidateQueries({ queryKey: ["firewall"] })} size="lg" radius="md" variant="filled"
            loading={rules.isFetching}><TbReload size={18} /></ActionIcon>
        </Tooltip>
        <Space w="xs" />
        <Tooltip label="Settings" position='bottom' color="cyan">
          <ActionIcon color="cyan" onClick={() => setSettingsModal(true)} size="lg" radius="md" variant="filled"><IoSettingsSharp size={18} /></ActionIcon>
        </Tooltip>
        <Space w="xs" />
        <DocsButton doc="firewall" />
        <Space w="xs" />
        <Tooltip label="Apply" position='bottom' color="grape">
          <ActionIcon color="grape" onClick={applyChanges} size="lg" radius="md" variant="filled" disabled={!valuesChanged}>
            <TiTick size={22} /></ActionIcon>
        </Tooltip>
      </Box>
    </Box>
    <Space h="xl" />
    <Divider />
    <Space h="md" />
    <Group justify="center" gap="sm">
      <Box>Filtering Table:</Box>
      <Tabs variant="pills" value={selectedTab} onChange={(v) => setSelectedTab(v == NFTables.MANGLE ? NFTables.MANGLE : NFTables.FILTER)}>
        <Tabs.List>
          <Tabs.Tab value={NFTables.FILTER}>
            Filter
          </Tabs.Tab>
          <Tabs.Tab value={NFTables.MANGLE}>
            Mangle
          </Tabs.Tab>
        </Tabs.List>
      </Tabs>
    </Group>
    {items.length > 0 ? <DragDropContext
      onDragEnd={({ destination, source }) => {
        if (!destination || destination.index == source.index) return
        handlers.reorder({
          from: visibleRules[source.index].index,
          to: visibleRules[destination.index].index,
        })
      }}
    >
      <Space h="md" />
      <Droppable droppableId="dnd-list" direction="vertical">
        {(provided) => (
          <Box {...provided.droppableProps} ref={provided.innerRef}>
            {items}
            {provided.placeholder}
          </Box>
        )}
      </Droppable>
    </DragDropContext> : <>
      <Box className='center-flex-row'>
        <Space h="xl" />
        <Title className='center-flex' style={{ textAlign: "center" }} order={3}>Firewall Rules allows you to use nftables but through a web interface</Title>
        <Space h="xs" />
        <Title className='center-flex' style={{ textAlign: "center" }} order={5}>Add new rules, sort it and enable the firewall: be carefull, wrong rules could also drops out firegex access</Title>
        <Space h="lg" />
        <Box className='center-flex' style={{ gap: 20 }}>
          <Tooltip label="Add a new rule" color="blue">
            <ActionIcon color="blue" onClick={emptyRuleAdd} size="xl" radius="md" variant="filled">
              <BsPlusLg size="20px" /></ActionIcon>
          </Tooltip>
        </Box>
      </Box>
    </>}

    <YesNoModal
      title='Are you sure to apply the changes to the firewall?'
      description={`If there is a malconfiguration you can lose the access to your server! ⚠️`}
      onClose={() => setEnableFwModal(false)}
      action={enableFirewall}
      opened={enableFwModal}
    />

    <YesNoModal
      title='Are you sure to apply the changes to the firewall?'
      description={`If there is a malconfiguration you can lose the access to your server! ⚠️`}
      onClose={() => setApplyChangeModal(false)}
      action={applyChangesRaw}
      opened={applyChangeModal}
    />

    <SettingsModal
      opened={settingsModal}
      onClose={() => setSettingsModal(false)}
    />


  </>
}