import { mdiDragHorizontalVariant, mdiPlus } from "@mdi/js";
import deepClone from "deep-clone-simple";
import type {
  HassServiceTarget,
  UnsubscribeFunc,
} from "home-assistant-js-websocket";
import type { PropertyValues } from "lit";
import { html, LitElement, nothing } from "lit";
import { customElement, property, queryAll, state } from "lit/decorators";
import { repeat } from "lit/directives/repeat";
import { ensureArray } from "../../../../common/array/ensure-array";
import { storage } from "../../../../common/decorators/storage";
import { fireEvent } from "../../../../common/dom/fire_event";
import { stopPropagation } from "../../../../common/dom/stop_propagation";
import { nextRender } from "../../../../common/util/render-status";
import "../../../../components/ha-button";
import "../../../../components/ha-sortable";
import "../../../../components/ha-svg-icon";
import {
  getValueFromDynamic,
  isDynamic,
  type AutomationClipboard,
  type Condition,
} from "../../../../data/automation";
import type { ConditionDescriptions } from "../../../../data/condition";
import {
  CONDITION_BUILDING_BLOCKS,
  subscribeConditions,
} from "../../../../data/condition";
import { subscribeLabFeature } from "../../../../data/labs";
import { SubscribeMixin } from "../../../../mixins/subscribe-mixin";
import type { HomeAssistant } from "../../../../types";
import {
  PASTE_VALUE,
  showAddAutomationElementDialog,
} from "../show-add-automation-element-dialog";
import { automationRowsStyles } from "../styles";
import "./ha-automation-condition-row";
import type HaAutomationConditionRow from "./ha-automation-condition-row";

@customElement("ha-automation-condition")
export default class HaAutomationCondition extends SubscribeMixin(LitElement) {
  @property({ attribute: false }) public hass!: HomeAssistant;

  @property({ attribute: false }) public conditions!: Condition[];

  @property({ attribute: false }) public highlightedConditions?: Condition[];

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

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

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

  @property({ type: Boolean, attribute: "sidebar" }) public optionsInSidebar =
    false;

  @state() private _rowSortSelected?: number;

  @state() private _conditionDescriptions: ConditionDescriptions = {};

  @state()
  @storage({
    key: "automationClipboard",
    state: true,
    subscribe: true,
    storage: "sessionStorage",
  })
  public _clipboard?: AutomationClipboard;

  @queryAll("ha-automation-condition-row")
  private _conditionRowElements?: HaAutomationConditionRow[];

  private _focusLastConditionOnChange = false;

  private _focusConditionIndexOnChange?: number;

  private _conditionKeys = new WeakMap<Condition, string>();

  private _unsub?: Promise<UnsubscribeFunc>;

  // @ts-ignore
  @state() private _newTriggersAndConditions = false;

  public disconnectedCallback() {
    super.disconnectedCallback();
    this._unsubscribe();
  }

  protected hassSubscribe() {
    return [
      subscribeLabFeature(
        this.hass!.connection,
        "automation",
        "new_triggers_conditions",
        (feature) => {
          this._newTriggersAndConditions = feature.enabled;
        }
      ),
    ];
  }

  private _subscribeDescriptions() {
    this._unsubscribe();
    this._conditionDescriptions = {};
    this._unsub = subscribeConditions(this.hass, (descriptions) => {
      this._conditionDescriptions = {
        ...this._conditionDescriptions,
        ...descriptions,
      };
    });
  }

  private _unsubscribe() {
    if (this._unsub) {
      this._unsub.then((unsub) => unsub());
      this._unsub = undefined;
    }
  }

  protected willUpdate(changedProperties: PropertyValues): void {
    super.willUpdate(changedProperties);
    if (changedProperties.has("_newTriggersAndConditions")) {
      this._subscribeDescriptions();
    }
  }

  protected firstUpdated(changedProps: PropertyValues) {
    super.firstUpdated(changedProps);
    this.hass.loadBackendTranslation("conditions");
  }

  protected updated(changedProperties: PropertyValues) {
    if (!changedProperties.has("conditions")) {
      return;
    }

    let updatedConditions: Condition[] | undefined;
    if (!Array.isArray(this.conditions)) {
      updatedConditions = [this.conditions];
    }

    (updatedConditions || this.conditions).forEach((condition, index) => {
      if (typeof condition === "string") {
        updatedConditions = updatedConditions || [...this.conditions];
        updatedConditions[index] = {
          condition: "template",
          value_template: condition,
        };
      }
    });

    if (updatedConditions) {
      fireEvent(this, "value-changed", {
        value: updatedConditions,
      });
    } else if (
      this._focusLastConditionOnChange ||
      this._focusConditionIndexOnChange !== undefined
    ) {
      const mode = this._focusLastConditionOnChange ? "new" : "moved";

      const row = this.shadowRoot!.querySelector<HaAutomationConditionRow>(
        `ha-automation-condition-row:${mode === "new" ? "last-of-type" : `nth-of-type(${this._focusConditionIndexOnChange! + 1})`}`
      )!;

      this._focusLastConditionOnChange = false;
      this._focusConditionIndexOnChange = undefined;

      row.updateComplete.then(() => {
        // on new condition open the settings in the sidebar, except for building blocks
        if (
          this.optionsInSidebar &&
          (!CONDITION_BUILDING_BLOCKS.includes(row.condition.condition) ||
            mode === "moved")
        ) {
          row.openSidebar();
          if (this.narrow) {
            row.scrollIntoView({
              block: "start",
              behavior: "smooth",
            });
          }
        }

        if (mode === "new") {
          row.expand();
        }

        if (!this.optionsInSidebar) {
          row.focus();
        }
      });
    }
  }

  public expandAll() {
    this._conditionRowElements?.forEach((row) => {
      row.expandAll();
    });
  }

  public collapseAll() {
    this._conditionRowElements?.forEach((row) => {
      row.collapseAll();
    });
  }

  protected render() {
    if (!Array.isArray(this.conditions)) {
      return nothing;
    }
    return html`
      <ha-sortable
        handle-selector=".handle"
        draggable-selector="ha-automation-condition-row"
        .disabled=${this.disabled}
        group="conditions"
        invert-swap
        @item-moved=${this._conditionMoved}
        @item-added=${this._conditionAdded}
        @item-removed=${this._conditionRemoved}
      >
        <div class="rows ${!this.optionsInSidebar ? "no-sidebar" : ""}">
          ${repeat(
            this.conditions.filter((c) => typeof c === "object"),
            (condition) => this._getKey(condition),
            (cond, idx) => html`
              <ha-automation-condition-row
                .root=${this.root}
                .sortableData=${cond}
                .index=${idx}
                .first=${idx === 0}
                .last=${idx === this.conditions.length - 1}
                .totalConditions=${this.conditions.length}
                .condition=${cond}
                .conditionDescriptions=${this._conditionDescriptions}
                .disabled=${this.disabled}
                .narrow=${this.narrow}
                @duplicate=${this._duplicateCondition}
                @insert-after=${this._insertAfter}
                @move-down=${this._moveDown}
                @move-up=${this._moveUp}
                @value-changed=${this._conditionChanged}
                .hass=${this.hass}
                .highlight=${this.highlightedConditions?.includes(cond)}
                .optionsInSidebar=${this.optionsInSidebar}
                .sortSelected=${this._rowSortSelected === idx}
                @stop-sort-selection=${this._stopSortSelection}
              >
                ${!this.disabled
                  ? html`
                      <div
                        tabindex="0"
                        class="handle ${this._rowSortSelected === idx
                          ? "active"
                          : ""}"
                        slot="icons"
                        @keydown=${this._handleDragKeydown}
                        @click=${stopPropagation}
                        .index=${idx}
                      >
                        <ha-svg-icon
                          .path=${mdiDragHorizontalVariant}
                        ></ha-svg-icon>
                      </div>
                    `
                  : nothing}
              </ha-automation-condition-row>
            `
          )}
          <div class="buttons">
            <ha-button
              .disabled=${this.disabled}
              @click=${this._addConditionDialog}
              .appearance=${this.root ? "accent" : "filled"}
              .size=${this.root ? "medium" : "small"}
            >
              <ha-svg-icon .path=${mdiPlus} slot="start"></ha-svg-icon>
              ${this.hass.localize(
                "ui.panel.config.automation.editor.conditions.add"
              )}
            </ha-button>
          </div>
        </div>
      </ha-sortable>
    `;
  }

  private _addConditionDialog() {
    if (this.narrow) {
      fireEvent(this, "request-close-sidebar");
    }
    showAddAutomationElementDialog(this, {
      type: "condition",
      add: this._addCondition,
      clipboardItem: this._clipboard?.condition?.condition,
    });
  }

  private _addCondition = (value: string, target?: HassServiceTarget) => {
    let conditions: Condition[];
    if (value === PASTE_VALUE) {
      conditions = this.conditions.concat(
        deepClone(this._clipboard!.condition)
      );
    } else if (isDynamic(value)) {
      conditions = this.conditions.concat({
        condition: getValueFromDynamic(value),
        target,
      });
    } else {
      const condition = value as Condition["condition"];
      const elClass = customElements.get(
        `ha-automation-condition-${condition}`
      ) as CustomElementConstructor & {
        defaultConfig: Condition;
      };
      conditions = this.conditions.concat({
        ...elClass.defaultConfig,
      });
    }
    this._focusLastConditionOnChange = true;
    fireEvent(this, "value-changed", { value: conditions });
  };

  private _getKey(condition: Condition) {
    if (!this._conditionKeys.has(condition)) {
      this._conditionKeys.set(condition, Math.random().toString());
    }

    return this._conditionKeys.get(condition)!;
  }

  private _moveUp(ev) {
    ev.stopPropagation();
    const index = (ev.target as any).index;
    if (!(ev.target as HaAutomationConditionRow).first) {
      const newIndex = index - 1;
      this._move(index, newIndex);
      if (this._rowSortSelected === index) {
        this._rowSortSelected = newIndex;
      }
      ev.target.focus();
    }
  }

  private _moveDown(ev) {
    ev.stopPropagation();
    const index = (ev.target as any).index;
    if (!(ev.target as HaAutomationConditionRow).last) {
      const newIndex = index + 1;
      this._move(index, newIndex);
      if (this._rowSortSelected === index) {
        this._rowSortSelected = newIndex;
      }
      ev.target.focus();
    }
  }

  private _move(oldIndex: number, newIndex: number) {
    const conditions = this.conditions.concat();
    const item = conditions.splice(oldIndex, 1)[0];
    conditions.splice(newIndex, 0, item);
    this.conditions = conditions;
    fireEvent(this, "value-changed", { value: conditions });
  }

  private _conditionMoved(ev: CustomEvent): void {
    ev.stopPropagation();
    const { oldIndex, newIndex } = ev.detail;
    this._move(oldIndex, newIndex);
  }

  private async _conditionAdded(ev: CustomEvent): Promise<void> {
    ev.stopPropagation();
    const { index, data } = ev.detail;
    const item = ev.detail.item as HaAutomationConditionRow;
    const selected = item.selected;
    let conditions = [
      ...this.conditions.slice(0, index),
      data,
      ...this.conditions.slice(index),
    ];
    // Add condition locally to avoid UI jump
    this.conditions = conditions;
    if (selected) {
      this._focusConditionIndexOnChange = conditions.length === 1 ? 0 : index;
    }
    await nextRender();
    if (this.conditions !== conditions) {
      // Ensure condition is added even after update
      conditions = [
        ...this.conditions.slice(0, index),
        data,
        ...this.conditions.slice(index),
      ];
      if (selected) {
        this._focusConditionIndexOnChange = conditions.length === 1 ? 0 : index;
      }
    }
    fireEvent(this, "value-changed", { value: conditions });
  }

  private async _conditionRemoved(ev: CustomEvent): Promise<void> {
    ev.stopPropagation();
    const { index } = ev.detail;
    const condition = this.conditions[index];
    // Remove condition locally to avoid UI jump
    this.conditions = this.conditions.filter((c) => c !== condition);
    await nextRender();
    // Ensure condition is removed even after update
    const conditions = this.conditions.filter((c) => c !== condition);
    fireEvent(this, "value-changed", { value: conditions });
  }

  private _conditionChanged(ev: CustomEvent) {
    ev.stopPropagation();
    const conditions = [...this.conditions];
    const newValue = ev.detail.value;
    const index = (ev.target as any).index;

    if (newValue === null) {
      conditions.splice(index, 1);
    } else {
      // Store key on new value.
      const key = this._getKey(conditions[index]);
      this._conditionKeys.set(newValue, key);

      conditions[index] = newValue;
    }

    this.conditions = conditions;

    fireEvent(this, "value-changed", { value: conditions });
  }

  private _duplicateCondition(ev: CustomEvent) {
    ev.stopPropagation();
    const index = (ev.target as any).index;
    fireEvent(this, "value-changed", {
      // @ts-expect-error Requires library bump to ES2023
      value: this.conditions.toSpliced(
        index + 1,
        0,
        deepClone(this.conditions[index])
      ),
    });
  }

  private _insertAfter(ev: CustomEvent) {
    ev.stopPropagation();
    const index = (ev.target as any).index;
    const inserted = ensureArray(ev.detail.value);
    this.highlightedConditions = inserted;
    fireEvent(this, "value-changed", {
      // @ts-expect-error Requires library bump to ES2023
      value: this.conditions.toSpliced(index + 1, 0, ...inserted),
    });
  }

  private _handleDragKeydown(ev: KeyboardEvent) {
    if (ev.key === "Enter" || ev.key === " ") {
      ev.stopPropagation();
      this._rowSortSelected =
        this._rowSortSelected === undefined
          ? (ev.target as any).index
          : undefined;
    }
  }

  private _stopSortSelection() {
    this._rowSortSelected = undefined;
  }

  static styles = automationRowsStyles;
}

declare global {
  interface HTMLElementTagNameMap {
    "ha-automation-condition": HaAutomationCondition;
  }
}
