<script>
import { _EDIT } from '@shell/config/query-params';
import { allHash } from '@shell/utils/promise';
import LabeledSelect from '@shell/components/form/LabeledSelect';
import Banner from '@components/Banner/Banner.vue';
import CompatibilityMatrix from '../CompatibilityMatrix';
import DeviceList from './DeviceList';

import remove from 'lodash/remove';
import { set } from '@shell/utils/object';
import { HCI } from '../../../types';
import DeviceList from './DeviceList';
import CompatibilityMatrix from './CompatibilityMatrix';

export default {
  name:       'VirtualMachinePCIDevices',
  components: {
    LabeledSelect,
    DeviceList,
    CompatibilityMatrix,
    Banner
  },
  props: {
    mode: {
      type:    String,
      default: _EDIT
    },
    // spec.template.spec
    value: {
      type:    Object,
      default: () => {}
    },

    vm: {
      type:    Object,
      default: () => {}
    }
  },

  async fetch() {
    const hash = {
      // claims fetched here so synchronous pciDevice model property works
      pciDevices: this.$store.dispatch('harvester/findAll', { type: HCI.PCI_DEVICE }),
      claims:     this.$store.dispatch('harvester/findAll', { type: HCI.PCI_CLAIM }),
      vms:        this.$store.dispatch(`harvester/findAll`, { type: HCI.VM })

    };

    const res = await allHash(hash);

    for (const key in res) {
      this[key] = res[key];
    }

    const selectedDevices = [];
    const oldFormatDevices = [];

    const vmDevices = this.value?.domain?.devices?.hostDevices || [];
    const otherDevices = this.otherDevices(vmDevices).map(({ name }) => name);

    vmDevices.forEach(({ name, deviceName }) => {
      const checkName = (deviceName || '').split('/')?.[1];

      if (checkName && name.includes(checkName) && !otherDevices.includes(name)) {
        oldFormatDevices.push(name);
      } else if (this.enabledDevices.find(device => device?.metadata?.name === name)) {
        selectedDevices.push(name);
      }
    });

    if (oldFormatDevices.length > 0) {
      this.oldFormatDevices = oldFormatDevices;
    } else {
      this.selectedDevices = selectedDevices;
    }
  },

  data() {
    return {
      pciDevices:       [],
      claims:           [],
      vms:              [],
      selectedDevices:  [],
      pciDeviceSchema:  this.$store.getters['harvester/schemaFor'](HCI.PCI_DEVICE),
      showMatrix:       false,
      oldFormatDevices: [],
    };
  },

  watch: {
    selectedDevices(neu) {
      const formatted = neu.map((selectedDevice) => {
        const deviceCRD = this.enabledDevices.find(device => device.metadata.name === selectedDevice);
        const deviceName = deviceCRD?.status?.resourceName;

        return {
          deviceName,
          name: deviceCRD?.metadata.name,
        };
      });

      const devices = [
        ...this.otherDevices(this.value.domain.devices.hostDevices || []),
        ...formatted,
      ];

      set(this.value.domain.devices, 'hostDevices', devices);
    }
  },

  computed: {
    // user can only select devices for whcih pci passthrough is enabled/claimed by them - determined by finding the associated passthrough CRD
    enabledDevices() {
      return this.pciDevices.filter((device) => {
        return device.isEnabled && device.claimedByMe;
      }) || [];
    },

    // find devices in use by other VMs and sum the number of each device already in use
    devicesInUse() {
      const inUse = this.vms.reduce((inUse, vm) => {
        // dont count devices in this vm as 'disabled' if they're just being used in the vm currently being edited
        if (vm.metadata.name === this.vm?.metadata?.name) {
          return inUse;
        }

        vm.hostDevices.forEach((device) => {
          inUse[device.name] = { usedBy: [vm.metadata.name] };
        });

        return inUse;
      }, {});

      return inUse;
    },

    devicesByNode() {
      return this.enabledDevices?.reduce((acc, device) => {
        const nodeName = device.status?.nodeName;

        if (nodeName) {
          if (!acc[nodeName]) {
            acc[nodeName] = [];
          } else {
            acc[nodeName].push(device);
          }
        }

        return acc;
      }, {});
    },

    // determine which nodes contain all devices selected
    compatibleNodes() {
      const out = [...Object.keys(this.devicesByNode)];

      this.selectedDevices.forEach((deviceUid) => {
        remove(out, (nodeName) => {
          const device = this.enabledDevices.find(deviceCRD => deviceCRD.metadata.name === deviceUid);

          return device.status.nodeName !== nodeName;
        });
      });

      return out;
    },

    // format an array of available devices for the dropdown
    deviceOpts() {
      const filteredOptions = this.enabledDevices.filter((deviceCRD) => {
        if (this.selectedDevices.length > 0) {
          const selectedDevice = this.enabledDevices.find(device => device.metadata.name === this.selectedDevices[0]);

          return !this.devicesInUse[deviceCRD?.metadata.name] && deviceCRD.status.nodeName === selectedDevice.status.nodeName;
        }

        return !this.devicesInUse[deviceCRD?.metadata.name];
      });

      return filteredOptions.map((deviceCRD) => {
        return {
          value:        deviceCRD?.metadata.name,
          label:        deviceCRD?.metadata.name,
          displayLabel: deviceCRD?.status?.resourceName,
        };
      });
    },

    oldFormatDevicesHTML() {
      return this.oldFormatDevices.map((device) => {
        return `<li>${ device }</li>`;
      }).join('');
    },
  },

  methods: {
    otherDevices(vmDevices) {
      return vmDevices.filter(device => !this.pciDevices.find(pci => device.name === pci.name));
    },

    nodeNameFromUid(uid) {
      for (const deviceUid in this.uniqueDevices) {
        const nodes = this.uniqueDevices[deviceUid].nodes;
        const thisNode = nodes.find(node => node.systemUUID === uid);

        if (thisNode) {
          return thisNode.name;
        }
      }
    },
  }
};
</script>

<template>
  <div>
    <div
      v-if="oldFormatDevices.length > 0"
      class="row"
    >
      <div class="col span-12">
        <Banner color="warning">
          <p v-clean-html="t('harvester.pci.oldFormatDevices.help', {oldFormatDevicesHTML}, true)" />
        </Banner>
      </div>
    </div>
    <div v-else>
      <div class="row">
        <div class="col span-12">
          <Banner color="info">
            <t k="harvester.pci.howToUseDevice" />
          </Banner>
          <Banner v-if="selectedDevices.length > 0" color="info">
            <t k="harvester.pci.deviceInTheSameHost" />
          </Banner>
        </div>
      </div>
      <template v-if="enabledDevices.length">
        <div class="row">
          <div class="col span-6">
            <LabeledSelect
              v-model:value="selectedDevices"
              label="Available PCI Devices"
              searchable
              multiple
              taggable
              :options="deviceOpts"
              :mode="mode"
            >
              <template #option="option">
                <span>{{ option.value }} <span class="text-label">({{ option.displayLabel }})</span></span>
              </template>
            </LabeledSelect>
          </div>
        </div>
        <div v-if="compatibleNodes.length && selectedDevices.length" class="row">
          <div class="col span-12 text-muted">
            Compatible hosts:
            <!-- eslint-disable-next-line vue/no-parsing-error -->
            <span v-for="(node, idx) in compatibleNodes" :key="idx">{{ node }}{{ idx < compatibleNodes.length-1 ? ', ' : '' }}</span>
          </div>
        </div>
        <div v-else-if="selectedDevices.length" class="text-error">
          {{ t('harvester.pci.impossibleSelection') }}
        </div>
        <button type="button" class="btn btn-sm role-link pl-0" @click="e=>{showMatrix = !showMatrix; e.target.blur()}">
          {{ showMatrix ? t('harvester.pci.hideCompatibility') : t('harvester.pci.showCompatibility') }}
        </button>
        <div v-if="showMatrix" class="row mt-20">
          <div class="col span-12">
            <CompatibilityMatrix :enabled-devices="enabledDevices" :devices-by-node="devicesByNode" :devices-in-use="devicesInUse" />
          </div>
        </div>
      </template>
      <div class="row mt-20">
        <div class="col span-12">
          <DeviceList :schema="pciDeviceSchema" :devices="pciDevices" @submit.prevent />
        </div>
      </div>
    </div>
  </div>
</template>
