import { mdiDotsVertical, mdiPlaylistEdit } from "@mdi/js";
import type { PropertyValues } from "lit";
import { css, html, LitElement, nothing } from "lit";
import { customElement, property, state } from "lit/decorators";
import { styleMap } from "lit/directives/style-map";
import memoizeOne from "memoize-one";
import { fireEvent } from "../../../../common/dom/fire_event";
import "../../../../components/ha-alert";
import "../../../../components/ha-button";
import "../../../../components/ha-dropdown";
import type { HaDropdownSelectEvent } from "../../../../components/ha-dropdown";
import "../../../../components/ha-dropdown-item";
import "../../../../components/ha-grid-size-picker";
import "../../../../components/ha-icon-button";
import "../../../../components/ha-md-list-item";
import "../../../../components/ha-slider";
import "../../../../components/ha-svg-icon";
import "../../../../components/ha-switch";
import "../../../../components/ha-yaml-editor";
import type { LovelaceCardConfig } from "../../../../data/lovelace/config/card";
import type { LovelaceSectionConfig } from "../../../../data/lovelace/config/section";
import { haStyle } from "../../../../resources/styles";
import type { HomeAssistant } from "../../../../types";
import type { HuiCard } from "../../cards/hui-card";
import type { CardGridSize } from "../../common/compute-card-grid-size";
import {
  computeCardGridSize,
  DEFAULT_GRID_SIZE,
  GRID_COLUMN_MULTIPLIER,
  isPreciseMode,
  migrateLayoutToGridOptions,
} from "../../common/compute-card-grid-size";
import type { LovelaceGridOptions } from "../../types";

@customElement("hui-card-layout-editor")
export class HuiCardLayoutEditor extends LitElement {
  @property({ attribute: false }) public hass!: HomeAssistant;

  @property({ attribute: false }) public config!: LovelaceCardConfig;

  @property({ attribute: false }) public sectionConfig!: LovelaceSectionConfig;

  @state() private _defaultGridOptions?: LovelaceGridOptions;

  @state() private _yamlMode = false;

  @state() private _uiAvailable = true;

  @state() private _preciseMode = false;

  private _cardElement?: HuiCard;

  private _mergedOptions = memoizeOne(
    (options?: LovelaceGridOptions, defaultOptions?: LovelaceGridOptions) => ({
      ...DEFAULT_GRID_SIZE,
      ...defaultOptions,
      ...options,
    })
  );

  private _computeCardGridSize = memoizeOne(computeCardGridSize);

  private _isDefault = memoizeOne(
    (options?: LovelaceGridOptions) =>
      options?.columns === undefined && options?.rows === undefined
  );

  private _configGridOptions = (config: LovelaceCardConfig) => {
    if (config.grid_options) {
      return config.grid_options;
    }
    if (config.layout_options) {
      return migrateLayoutToGridOptions(config.layout_options);
    }
    return {};
  };

  render() {
    const configOptions = this._configGridOptions(this.config);
    const options = this._mergedOptions(
      configOptions,
      this._defaultGridOptions
    );

    const gridOptions = options;
    const gridValue = this._computeCardGridSize(gridOptions);

    const columnSpan = this.sectionConfig.column_span ?? 1;
    const gridTotalColumns = 12 * columnSpan;

    return html`
      ${
        this._defaultGridOptions &&
        Object.keys(this._defaultGridOptions).length === 0
          ? html`
              <ha-alert alert-type="info">
                ${this.hass.localize(
                  "ui.panel.lovelace.editor.edit_card.layout.no_grid_support"
                )}
              </ha-alert>
            `
          : nothing
      }
      <div class="header">
        <ha-dropdown
          slot="icons"
          @wa-select=${this._handleAction}
          placement="bottom-end"
        >
          <ha-icon-button
            slot="trigger"
            .label=${this.hass.localize("ui.common.menu")}
            .path=${mdiDotsVertical}
          >
          </ha-icon-button>

          <ha-dropdown-item value="toggle_yaml" .disabled=${!this._uiAvailable}>
            ${this.hass.localize(
              `ui.panel.lovelace.editor.edit_view.edit_${!this._yamlMode ? "yaml" : "ui"}`
            )}
            <ha-svg-icon slot="icon" .path=${mdiPlaylistEdit}></ha-svg-icon>
          </ha-dropdown-item>
        </ha-dropdown>
      </div>
      ${
        this._yamlMode
          ? html`
              <ha-yaml-editor
                .defaultValue=${configOptions}
                @value-changed=${this._yamlChanged}
              ></ha-yaml-editor>
            `
          : html`
              <ha-grid-size-picker
                style=${styleMap({
                  "max-width": `${(this.sectionConfig.column_span ?? 1) * 250 + 40}px`,
                })}
                .columns=${gridTotalColumns}
                .value=${gridValue}
                .isDefault=${this._isDefault(configOptions)}
                @value-changed=${this._gridSizeChanged}
                .rowMin=${gridOptions.min_rows}
                .rowMax=${gridOptions.max_rows}
                .columnMin=${gridOptions.min_columns}
                .columnMax=${gridOptions.max_columns}
                .step=${this._preciseMode ? 1 : GRID_COLUMN_MULTIPLIER}
              ></ha-grid-size-picker>
              <ha-md-list-item>
                <span slot="headline"
                  >${this.hass.localize(
                    "ui.panel.lovelace.editor.edit_card.layout.auto_height"
                  )}</span
                >
                <span slot="supporting-text"
                  >${this.hass.localize(
                    "ui.panel.lovelace.editor.edit_card.layout.auto_height_helper"
                  )}</span
                >
                <ha-switch
                  slot="end"
                  @change=${this._autoHeightChanged}
                  .checked=${options.rows === "auto"}
                  name="auto-height"
                ></ha-switch>
              </ha-md-list-item>
              <ha-md-list-item>
                <span slot="headline"
                  >${this.hass.localize(
                    "ui.panel.lovelace.editor.edit_card.layout.full_width"
                  )}</span
                >
                <span slot="supporting-text"
                  >${this.hass.localize(
                    "ui.panel.lovelace.editor.edit_card.layout.full_width_helper"
                  )}</span
                >
                <ha-switch
                  slot="end"
                  @change=${this._fullWidthChanged}
                  .checked=${options.columns === "full"}
                  name="full-width"
                ></ha-switch>
              </ha-md-list-item>
              <ha-md-list-item>
                <span slot="headline"
                  >${this.hass.localize(
                    "ui.panel.lovelace.editor.edit_card.layout.precise_mode"
                  )}</span
                >
                <span slot="supporting-text"
                  >${this.hass.localize(
                    "ui.panel.lovelace.editor.edit_card.layout.precise_mode_helper"
                  )}</span
                >
                <ha-switch
                  slot="end"
                  @change=${this._preciseModeChanged}
                  .checked=${this._preciseMode}
                  name="precise-mode"
                ></ha-switch>
              </ha-md-list-item>
            `
      }
    `;
  }

  protected firstUpdated(changedProps: PropertyValues<this>): void {
    super.firstUpdated(changedProps);
    try {
      this._cardElement = document.createElement("hui-card");
      this._cardElement.hass = this.hass;
      this._cardElement.preview = true;
      this._cardElement.config = this.config;
      this._cardElement.addEventListener("card-updated", (ev: Event) => {
        ev.stopPropagation();
        this._updateDefaultGridOptions();
      });
      this._cardElement.load();
      this._updateDefaultGridOptions();
    } catch (err) {
      // eslint-disable-next-line no-console
      console.error(err);
    }
  }

  private _updateDefaultGridOptions() {
    if (!this._cardElement) {
      this._defaultGridOptions = undefined;
      return;
    }
    this._defaultGridOptions = this._cardElement.getElementGridOptions();
  }

  protected updated(changedProps: PropertyValues<this>): void {
    super.updated(changedProps);
    if (this._cardElement) {
      if (changedProps.has("hass")) {
        this._cardElement.hass = this.hass;
      }
      if (changedProps.has("config")) {
        this._cardElement.config = this.config;
      }
    }
  }

  protected willUpdate(changedProps: PropertyValues<this>): void {
    super.willUpdate(changedProps);
    if (changedProps.has("config")) {
      const options = this.config.grid_options;

      // Reset precise mode when grid options config is reset
      if (!options) {
        this._preciseMode = this._defaultGridOptions
          ? isPreciseMode(this._defaultGridOptions)
          : false;
        return;
      }

      // Force precise mode if columns count is not a multiple of 3
      const preciseMode = isPreciseMode(options);
      if (!this._preciseMode && preciseMode) {
        this._preciseMode = preciseMode;
      }
    }
  }

  private async _handleAction(ev: HaDropdownSelectEvent) {
    const action = ev.detail.item.value;

    if (action === "toggle_yaml") {
      this._yamlMode = !this._yamlMode;
    }
  }

  private _gridSizeChanged(ev: CustomEvent): void {
    ev.stopPropagation();
    const value = ev.detail.value as CardGridSize;

    this._updateGridOptions({
      ...this.config.grid_options,
      columns: value.columns,
      rows: value.rows,
    });
  }

  private _yamlChanged(ev: CustomEvent): void {
    ev.stopPropagation();
    const options = ev.detail.value as LovelaceGridOptions;
    this._updateGridOptions(options);
  }

  private _fullWidthChanged(ev): void {
    ev.stopPropagation();
    const checked = ev.target.checked;

    let columns: number | "full" | undefined;
    const defaultGridOptions = {
      ...DEFAULT_GRID_SIZE,
      ...this._defaultGridOptions,
    };
    if (checked) {
      columns = "full";
    } else if (defaultGridOptions.columns === "full") {
      // Default is full width, so we need to set a specific value
      const columnSpan = this.sectionConfig.column_span ?? 1;
      const gridTotalColumns = 12 * columnSpan;
      columns = defaultGridOptions.max_columns ?? gridTotalColumns;
    } else {
      columns = undefined;
    }

    this._updateGridOptions({
      ...this.config.grid_options,
      columns,
    });
  }

  private _autoHeightChanged(ev): void {
    ev.stopPropagation();
    const checked = ev.target.checked;

    let rows: number | "auto" | undefined;
    const defaultGridOptions = {
      ...DEFAULT_GRID_SIZE,
      ...this._defaultGridOptions,
    };
    if (checked) {
      rows = "auto";
    } else if (defaultGridOptions.rows === "auto") {
      // Default is auto height, so we need to set a specific value
      rows = defaultGridOptions.min_rows ?? 1;
    } else {
      rows = undefined;
    }

    this._updateGridOptions({
      ...this.config.grid_options,
      rows,
    });
  }

  private _preciseModeChanged(ev): void {
    ev.stopPropagation();
    this._preciseMode = ev.target.checked;
    if (this._preciseMode) return;

    const columns = this.config.grid_options?.columns;

    if (typeof columns === "number" && columns % GRID_COLUMN_MULTIPLIER !== 0) {
      const newColumns =
        Math.ceil(columns / GRID_COLUMN_MULTIPLIER) * GRID_COLUMN_MULTIPLIER;
      this._updateGridOptions({
        ...this.config.grid_options,
        columns: newColumns,
      });
    }
  }

  private _updateGridOptions(options: LovelaceGridOptions): void {
    const value: LovelaceCardConfig = {
      ...this.config,
      grid_options: {
        ...options,
      },
    };
    if (value.grid_options) {
      for (const [k, v] of Object.entries(value.grid_options)) {
        if (v === undefined) {
          delete value.grid_options[k];
        }
      }
      if (Object.keys(value.grid_options).length === 0) {
        delete value.grid_options;
      }
    }
    if (value.layout_options) {
      delete value.layout_options;
    }
    fireEvent(this, "value-changed", { value });
  }

  static styles = [
    haStyle,
    css`
      .header {
        display: flex;
        flex-direction: row;
        align-items: flex-start;
        justify-content: flex-end;
      }
      .header ha-dropdown {
        --mdc-theme-text-primary-on-background: var(--primary-text-color);
        margin-top: -8px;
      }
      .disabled {
        opacity: 0.5;
        pointer-events: none;
      }
      ha-grid-size-picker {
        display: block;
        margin: 16px auto;
        direction: ltr;
      }
      ha-yaml-editor {
        display: block;
        margin: 16px 0;
      }
    `,
  ];
}

declare global {
  interface HTMLElementTagNameMap {
    "hui-card-layout-editor": HuiCardLayoutEditor;
  }
}
