import type { RenderItemFunction } from "@lit-labs/virtualizer/virtualize";
import {
  mdiChartLine,
  mdiHelpCircleOutline,
  mdiPencil,
  mdiShape,
} from "@mdi/js";
import type { HassEntity } from "home-assistant-js-websocket";
import { html, LitElement, nothing, type PropertyValues } from "lit";
import { customElement, property, query } from "lit/decorators";
import memoizeOne from "memoize-one";
import { ensureArray } from "../../common/array/ensure-array";
import { type HASSDomEvent, fireEvent } from "../../common/dom/fire_event";
import { computeEntityNameList } from "../../common/entity/compute_entity_name_display";
import { computeStateName } from "../../common/entity/compute_state_name";
import { computeRTL } from "../../common/util/compute_rtl";
import { domainToName } from "../../data/integration";
import {
  getStatisticIds,
  getStatisticLabel,
  type StatisticsMetaData,
} from "../../data/recorder";
import type { HomeAssistant, ValueChangedEvent } from "../../types";
import { documentationUrl } from "../../util/documentation-url";
import "../ha-combo-box-item";
import "../ha-generic-picker";
import type { HaGenericPicker } from "../ha-generic-picker";
import "../ha-icon-button";
import type {
  PickerComboBoxItem,
  PickerComboBoxSearchFn,
} from "../ha-picker-combo-box";
import type { PickerValueRenderer } from "../ha-picker-field";
import "../ha-svg-icon";
import "./state-badge";

const TYPE_ORDER = ["entity", "external", "no_state"] as StatisticItemType[];

const MISSING_ID = "___missing-entity___";

type StatisticItemType = "entity" | "external" | "no_state";

interface StatisticComboBoxItem extends PickerComboBoxItem {
  statistic_id?: string;
  stateObj?: HassEntity;
  domainName?: string;
  type?: StatisticItemType;
}

const SEARCH_KEYS = [
  { name: "label", weight: 10 },
  { name: "search_labels.entityName", weight: 10 },
  { name: "search_labels.friendlyName", weight: 9 },
  { name: "search_labels.deviceName", weight: 8 },
  { name: "search_labels.areaName", weight: 6 },
  { name: "search_labels.domainName", weight: 4 },
  { name: "statisticId", weight: 3 },
  { name: "id", weight: 2 },
];

export interface StatisticElementChangedEvent {
  statisticId: string;
}

declare global {
  interface HASSDomEvents {
    "edit-statistics-element": StatisticElementChangedEvent;
  }
}

@customElement("ha-statistic-picker")
export class HaStatisticPicker extends LitElement {
  @property({ attribute: false }) public hass!: HomeAssistant;

  // eslint-disable-next-line lit/no-native-attributes
  @property({ type: Boolean }) public autofocus = false;

  @property({ type: Boolean }) public disabled = false;

  @property({ type: Boolean }) public required = false;

  @property() public label?: string;

  @property() public value?: string;

  @property() public helper?: string;

  @property() public placeholder?: string;

  @property({ attribute: "statistic-types" })
  public statisticTypes?: "mean" | "sum";

  @property({ type: Boolean, attribute: "allow-custom-entity" })
  public allowCustomEntity;

  @property({ attribute: false })
  public statisticIds?: StatisticsMetaData[];

  @property({ attribute: false }) public helpMissingEntityUrl =
    "/more-info/statistics/";

  /**
   * Show only statistics natively stored with these units of measurements.
   * @type {Array}
   * @attr include-statistics-unit-of-measurement
   */
  @property({
    type: Array,
    attribute: "include-statistics-unit-of-measurement",
  })
  public includeStatisticsUnitOfMeasurement?: string | string[];

  /**
   * Show only statistics with these unit classes.
   * @attr include-unit-class
   */
  @property({ attribute: "include-unit-class" })
  public includeUnitClass?: string | string[];

  /**
   * Show only statistics with these device classes.
   * @attr include-device-class
   */
  @property({ attribute: "include-device-class" })
  public includeDeviceClass?: string | string[];

  /**
   * Show only statistics on entities.
   * @type {Boolean}
   * @attr entities-only
   */
  @property({ type: Boolean, attribute: "entities-only" })
  public entitiesOnly = false;

  /**
   * List of statistics to be excluded.
   * @type {Array}
   * @attr exclude-statistics
   */
  @property({ type: Array, attribute: "exclude-statistics" })
  public excludeStatistics?: string[];

  @property({ attribute: "hide-clear-icon", type: Boolean })
  public hideClearIcon = false;

  @query("ha-generic-picker") private _picker?: HaGenericPicker;

  @property({ attribute: "can-edit", type: Boolean }) public canEdit?: boolean;

  public willUpdate(changedProps: PropertyValues<this>) {
    if (
      (!this.hasUpdated && !this.statisticIds) ||
      changedProps.has("statisticTypes")
    ) {
      this._getStatisticIds();
    }
  }

  private async _getStatisticIds() {
    this.statisticIds = await getStatisticIds(this.hass, this.statisticTypes);
    this._picker?.requestUpdate();
    this._valueRenderer = this._makeValueRenderer();
  }

  private _getItems = () =>
    this._getStatisticsItems(
      this.hass,
      this.statisticIds,
      this.includeStatisticsUnitOfMeasurement,
      this.includeUnitClass,
      this.includeDeviceClass,
      this.entitiesOnly,
      this.excludeStatistics,
      this.value
    );

  private _getAdditionalItems = (): StatisticComboBoxItem[] => [
    {
      id: MISSING_ID,
      primary: this.hass.localize(
        "ui.components.statistic-picker.missing_entity"
      ),
      icon_path: mdiHelpCircleOutline,
    },
  ];

  private _getStatisticsItems = memoizeOne(
    (
      hass: HomeAssistant,
      statisticIds?: StatisticsMetaData[],
      includeStatisticsUnitOfMeasurement?: string | string[],
      includeUnitClass?: string | string[],
      includeDeviceClass?: string | string[],
      entitiesOnly?: boolean,
      excludeStatistics?: string[],
      value?: string
    ): StatisticComboBoxItem[] | undefined => {
      if (!statisticIds) {
        return undefined;
      }

      if (includeStatisticsUnitOfMeasurement) {
        const includeUnits: (string | null)[] = ensureArray(
          includeStatisticsUnitOfMeasurement
        );
        statisticIds = statisticIds.filter((meta) =>
          includeUnits.includes(meta.statistics_unit_of_measurement)
        );
      }
      if (includeUnitClass) {
        const includeUnitClasses: (string | null)[] =
          ensureArray(includeUnitClass);
        statisticIds = statisticIds.filter((meta) =>
          includeUnitClasses.includes(meta.unit_class)
        );
      }
      if (includeDeviceClass) {
        const includeDeviceClasses: (string | null)[] =
          ensureArray(includeDeviceClass);
        statisticIds = statisticIds.filter((meta) => {
          const stateObj = this.hass.states[meta.statistic_id];
          if (!stateObj) {
            return true;
          }
          return includeDeviceClasses.includes(
            stateObj.attributes.device_class || ""
          );
        });
      }

      const isRTL = computeRTL(
        hass.language,
        hass.translationMetadata.translations
      );

      const output: StatisticComboBoxItem[] = [];

      statisticIds.forEach((meta) => {
        if (
          excludeStatistics &&
          meta.statistic_id !== value &&
          excludeStatistics.includes(meta.statistic_id)
        ) {
          return;
        }
        const stateObj = this.hass.states[meta.statistic_id];

        if (!stateObj) {
          if (!entitiesOnly) {
            const id = meta.statistic_id;
            const label = getStatisticLabel(this.hass, meta.statistic_id, meta);
            const type =
              meta.statistic_id.includes(":") &&
              !meta.statistic_id.includes(".")
                ? "external"
                : "no_state";

            const sortingPrefix = `${TYPE_ORDER.indexOf(type)}`;
            if (type === "no_state") {
              output.push({
                id,
                primary: label,
                secondary: this.hass.localize(
                  "ui.components.statistic-picker.no_state"
                ),
                type,
                sorting_label: [sortingPrefix, label].join("_"),
                icon_path: mdiShape,
              });
            } else if (type === "external") {
              const domain = id.split(":")[0];
              const domainName = domainToName(this.hass.localize, domain);
              output.push({
                id,
                statistic_id: id,
                primary: label,
                secondary: domainName,
                type,
                sorting_label: [sortingPrefix, label].join("_"),
                search_labels: { label, domainName },
                icon_path: mdiChartLine,
              });
            }
          }
          return;
        }
        const id = meta.statistic_id;

        const friendlyName = computeStateName(stateObj); // Keep this for search

        const [entityName, deviceName, areaName] = computeEntityNameList(
          stateObj,
          [{ type: "entity" }, { type: "device" }, { type: "area" }],
          hass.entities,
          hass.devices,
          hass.areas,
          hass.floors
        );

        const primary = entityName || deviceName || id;
        const secondary = [areaName, entityName ? deviceName : undefined]
          .filter(Boolean)
          .join(isRTL ? " ◂ " : " ▸ ");

        const sortingPrefix = `${TYPE_ORDER.indexOf("entity")}`;
        output.push({
          id,
          statistic_id: id,
          primary,
          secondary,
          stateObj: stateObj,
          type: "entity",
          sorting_label: [sortingPrefix, deviceName, entityName].join("_"),
          search_labels: {
            entityName: entityName || null,
            deviceName: deviceName || null,
            areaName: areaName || null,
            friendlyName,
          },
        });
      });

      return output;
    }
  );

  private _statisticMetaData = memoizeOne(
    (statisticId: string, statisticIds: StatisticsMetaData[]) => {
      if (!statisticIds) {
        return undefined;
      }
      return statisticIds.find(
        (statistic) => statistic.statistic_id === statisticId
      );
    }
  );

  private _renderValue(value: string) {
    const statisticId = value;

    const item = this._computeItem(statisticId);

    return html`
      ${item.stateObj
        ? html`
            <state-badge .stateObj=${item.stateObj} slot="start"></state-badge>
          `
        : item.icon_path
          ? html`
              <ha-svg-icon slot="start" .path=${item.icon_path}></ha-svg-icon>
            `
          : nothing}
      <span slot="headline">${item.primary}</span>
      ${item.secondary
        ? html`<span slot="supporting-text">${item.secondary}</span>`
        : nothing}
      ${this.canEdit
        ? html`<ha-icon-button
            slot="end"
            .value=${statisticId}
            .label=${this.hass.localize("ui.common.edit")}
            .path=${mdiPencil}
            @click=${this._editItem}
          ></ha-icon-button>`
        : nothing}
    `;
  }

  private _makeValueRenderer(): PickerValueRenderer {
    return (value) => this._renderValue(value);
  }

  private _valueRenderer: PickerValueRenderer = this._makeValueRenderer();

  private _editItem(ev: HASSDomEvent<StatisticElementChangedEvent>) {
    ev.stopPropagation();
    const statisticId = (ev.currentTarget as any).value;
    fireEvent(this, "edit-statistics-element", { statisticId });
  }

  private _computeItem(statisticId: string): StatisticComboBoxItem {
    const stateObj = this.hass.states[statisticId];

    if (stateObj) {
      const [entityName, deviceName, areaName] = computeEntityNameList(
        stateObj,
        [{ type: "entity" }, { type: "device" }, { type: "area" }],
        this.hass.entities,
        this.hass.devices,
        this.hass.areas,
        this.hass.floors
      );

      const isRTL = computeRTL(
        this.hass.language,
        this.hass.translationMetadata.translations
      );

      const primary = entityName || deviceName || statisticId;
      const secondary = [areaName, entityName ? deviceName : undefined]
        .filter(Boolean)
        .join(isRTL ? " ◂ " : " ▸ ");
      const friendlyName = computeStateName(stateObj); // Keep this for search

      const sortingPrefix = `${TYPE_ORDER.indexOf("entity")}`;
      return {
        id: statisticId,
        statistic_id: statisticId,
        primary,
        secondary,
        stateObj: stateObj,
        type: "entity",
        sorting_label: [sortingPrefix, deviceName, entityName].join("_"),
        search_labels: {
          entityName: entityName || null,
          deviceName: deviceName || null,
          areaName: areaName || null,
          friendlyName,
          statisticId,
        },
      };
    }

    const statistic = this.statisticIds
      ? this._statisticMetaData(statisticId, this.statisticIds)
      : undefined;

    if (statistic) {
      const type =
        statisticId.includes(":") && !statisticId.includes(".")
          ? "external"
          : "no_state";

      if (type === "external") {
        const sortingPrefix = `${TYPE_ORDER.indexOf("external")}`;
        const label = getStatisticLabel(this.hass, statisticId, statistic);
        const domain = statisticId.split(":")[0];
        const domainName = domainToName(this.hass.localize, domain);

        return {
          id: statisticId,
          statistic_id: statisticId,
          primary: label,
          secondary: domainName,
          type: "external",
          sorting_label: [sortingPrefix, label].join("_"),
          search_labels: { label, domainName, statisticId },
          icon_path: mdiChartLine,
        };
      }
    }

    const sortingPrefix = `${TYPE_ORDER.indexOf("external")}`;
    const label = getStatisticLabel(this.hass, statisticId, statistic);

    return {
      id: statisticId,
      primary: label,
      secondary: this.hass.localize("ui.components.statistic-picker.no_state"),
      type: "no_state",
      sorting_label: [sortingPrefix, label].join("_"),
      search_labels: { label, statisticId },
      icon_path: mdiShape,
    };
  }

  private _rowRenderer: RenderItemFunction<StatisticComboBoxItem> = (
    item,
    index
  ) => {
    const showEntityId = this.hass.userData?.showEntityIdPicker;
    return html`
      <ha-combo-box-item type="button" compact .borderTop=${index !== 0}>
        ${item.icon_path
          ? html`
              <ha-svg-icon
                style="margin: 0 4px"
                slot="start"
                .path=${item.icon_path}
              ></ha-svg-icon>
            `
          : item.stateObj
            ? html`
                <state-badge
                  slot="start"
                  .stateObj=${item.stateObj}
                ></state-badge>
              `
            : nothing}
        <span slot="headline">${item.primary} </span>
        ${item.secondary
          ? html`<span slot="supporting-text">${item.secondary}</span>`
          : nothing}
        ${item.statistic_id && showEntityId
          ? html`<span slot="supporting-text" class="code">
              ${item.statistic_id}
            </span>`
          : nothing}
      </ha-combo-box-item>
    `;
  };

  protected render() {
    const placeholder =
      this.placeholder ??
      this.hass.localize("ui.components.statistic-picker.placeholder");

    return html`
      <ha-generic-picker
        .hass=${this.hass}
        .autofocus=${this.autofocus}
        .allowCustomValue=${this.allowCustomEntity}
        .disabled=${this.disabled}
        .label=${this.label}
        use-top-label
        .placeholder=${placeholder}
        .value=${this.value}
        .notFoundLabel=${this._notFoundLabel}
        .emptyLabel=${this.hass.localize(
          "ui.components.statistic-picker.no_statistics"
        )}
        .rowRenderer=${this._rowRenderer}
        .getItems=${this._getItems}
        .getAdditionalItems=${this._getAdditionalItems}
        .hideClearIcon=${this.hideClearIcon}
        .searchFn=${this._searchFn}
        .valueRenderer=${this._valueRenderer}
        .helper=${this.helper}
        .searchKeys=${SEARCH_KEYS}
        .unknownItemText=${this.hass.localize(
          "ui.components.statistic-picker.unknown"
        )}
        @value-changed=${this._valueChanged}
      >
      </ha-generic-picker>
    `;
  }

  private _searchFn: PickerComboBoxSearchFn<StatisticComboBoxItem> = (
    search,
    filteredItems
  ) => {
    // If there is exact match for entity id or statistic id, put it first
    const index = filteredItems.findIndex(
      (item) =>
        item.stateObj?.entity_id === search || item.statistic_id === search
    );
    if (index === -1) {
      return filteredItems;
    }

    const [exactMatch] = filteredItems.splice(index, 1);
    filteredItems.unshift(exactMatch);
    return filteredItems;
  };

  private _valueChanged(ev: ValueChangedEvent<string>) {
    ev.stopPropagation();
    const value = ev.detail.value;

    if (value === MISSING_ID) {
      window.open(
        documentationUrl(this.hass, this.helpMissingEntityUrl),
        "_blank"
      );
      return;
    }

    this.value = value;
    fireEvent(this, "value-changed", { value });
  }

  public async open() {
    await this.updateComplete;
    await this._picker?.open();
  }

  private _notFoundLabel = (search: string) =>
    this.hass.localize("ui.components.statistic-picker.no_match", {
      term: html`<b>‘${search}’</b>`,
    });
}

declare global {
  interface HTMLElementTagNameMap {
    "ha-statistic-picker": HaStatisticPicker;
  }
}
