import type { PropertyValues } from "lit";
import { LitElement, css, html, nothing } from "lit";
import { customElement, property, state } from "lit/decorators";
import checkValidDate from "../../../common/datetime/check_valid_date";
import "../../../components/ha-attribute-value";
import type { HomeAssistant } from "../../../types";
import { hasConfigOrEntityChanged } from "../common/has-changed";
import "../components/hui-generic-entity-row";
import "../components/hui-timestamp-display";
import { createEntityNotFoundWarning } from "../components/hui-warning";
import type { AttributeRowConfig, LovelaceRow } from "../entity-rows/types";

@customElement("hui-attribute-row")
class HuiAttributeRow extends LitElement implements LovelaceRow {
  @property({ attribute: false }) public hass?: HomeAssistant;

  @state() private _config?: AttributeRowConfig;

  public setConfig(config: AttributeRowConfig): void {
    if (!config) {
      throw new Error("Invalid configuration");
    }
    if (!config.entity) {
      throw new Error("Entity not specified");
    }
    if (!config.attribute) {
      throw new Error("Attribute not specified");
    }
    this._config = config;
  }

  protected shouldUpdate(changedProps: PropertyValues<this>): boolean {
    return hasConfigOrEntityChanged(this, changedProps);
  }

  protected render() {
    if (!this._config || !this.hass) {
      return nothing;
    }

    const stateObj = this.hass.states[this._config.entity];

    if (!stateObj) {
      return html`
        <hui-warning .hass=${this.hass}>
          ${createEntityNotFoundWarning(this.hass, this._config.entity)}
        </hui-warning>
      `;
    }

    const attribute = stateObj.attributes[this._config.attribute];
    let date: Date | undefined;
    if (this._config.time_format) {
      date = new Date(attribute);
    }

    return html`
      <hui-generic-entity-row .hass=${this.hass} .config=${this._config}>
        ${this._config.prefix}
        ${
          this._config.time_format && checkValidDate(date)
            ? html` <hui-timestamp-display
                .hass=${this.hass}
                .ts=${date}
                .format=${this._config.time_format}
                capitalize
              ></hui-timestamp-display>`
            : attribute !== undefined
              ? html`
                  <ha-attribute-value
                    .hideUnit=${
                      this._config.suffix !== undefined &&
                      this._config.suffix !== ""
                    }
                    .stateObj=${stateObj}
                    .attribute=${this._config.attribute}
                  >
                  </ha-attribute-value>
                `
              : "—"
        }
        ${this._config.suffix}
      </hui-generic-entity-row>
    `;
  }

  static styles = css`
    div {
      text-align: right;
    }
  `;
}

declare global {
  interface HTMLElementTagNameMap {
    "hui-attribute-row": HuiAttributeRow;
  }
}
