import type { PropertyValues } from "lit";
import { css, html, LitElement, nothing } from "lit";
import { customElement, property, state } from "lit/decorators";
import { clampValue } from "../data/number";
import { useAmPm } from "../common/datetime/use_am_pm";
import { fireEvent } from "../common/dom/fire_event";
import type { FrontendLocaleData } from "../data/translation";
import type { HomeAssistant } from "../types";
import type { ClampedValue } from "../data/number";
import "./ha-base-time-input";
import "./ha-button";
import "./ha-numeric-arrow-input";

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

  @property({ attribute: false }) public locale!: FrontendLocaleData;

  @property({ attribute: false }) public value?: string;

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

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

  @property({ attribute: false }) public enableSeconds = false;

  @state() private _hours = 0;

  @state() private _minutes = 0;

  @state() private _seconds = 0;

  @state() private _useAmPm = false;

  @state() private _isPm = false;

  protected firstUpdated(changedProperties: PropertyValues) {
    super.firstUpdated(changedProperties);
    this._useAmPm = useAmPm(this.locale);

    let hours = NaN;
    let minutes = NaN;
    let seconds = NaN;
    let isPm = false;

    if (this.value) {
      const parts = this.value?.split(":") || [];
      minutes = parts[1] ? Number(parts[1]) : 0;
      seconds = parts[2] ? Number(parts[2]) : 0;
      const hour24 = parts[0] ? Number(parts[0]) : 0;

      if (this._useAmPm) {
        if (hour24 === 0) {
          hours = 12;
          isPm = false;
        } else if (hour24 < 12) {
          hours = hour24;
          isPm = false;
        } else if (hour24 === 12) {
          hours = 12;
          isPm = true;
        } else {
          hours = hour24 - 12;
          isPm = true;
        }
      } else {
        hours = hour24;
      }
    }

    this._hours = hours;
    this._minutes = minutes;
    this._seconds = seconds;
    this._isPm = isPm;
  }

  protected render() {
    return html`<div class="time-picker-container">
      <ha-numeric-arrow-input
        .disabled=${this.disabled}
        .required=${this.required}
        .min=${this._useAmPm ? 1 : 0}
        .max=${this._useAmPm ? 12 : 23}
        .step=${1}
        .padStart=${2}
        .value=${this._hours}
        @value-changed=${this._hoursChanged}
        .labelUp=${
          // TODO: Localize
          "Increase hours"
        }
        .labelDown=${
          // TODO: Localize
          "Decrease hours"
        }
      ></ha-numeric-arrow-input>
      <span class="time-picker-separator">:</span>
      <ha-numeric-arrow-input
        .disabled=${this.disabled}
        .required=${this.required}
        .min=${0}
        .max=${59}
        .step=${1}
        .padStart=${2}
        .labelUp=${
          // TODO: Localize
          "Increase minutes"
        }
        .labelDown=${
          // TODO: Localize
          "Decrease minutes"
        }
        .value=${this._minutes}
        @value-changed=${this._minutesChanged}
      ></ha-numeric-arrow-input>
      ${this.enableSeconds
        ? html`
            <span class="time-picker-separator">:</span>
            <ha-numeric-arrow-input
              .disabled=${this.disabled}
              .required=${this.required}
              .min=${0}
              .max=${59}
              .step=${1}
              .padStart=${2}
              .labelUp=${
                // TODO: Localize
                "Increase seconds"
              }
              .labelDown=${
                // TODO: Localize
                "Decrease seconds"
              }
              .value=${this._seconds}
              @value-changed=${this._secondsChanged}
            ></ha-numeric-arrow-input>
          `
        : nothing}
      ${this._useAmPm
        ? html`
            <ha-button @click=${this._toggleAmPm}>
              ${this._isPm ? "PM" : "AM"}
            </ha-button>
          `
        : nothing}
    </div>`;
  }

  protected updated(changedProperties: PropertyValues) {
    super.updated(changedProperties);

    if (changedProperties.has("_hours")) {
      this._timeUpdated();
    }

    if (changedProperties.has("_minutes")) {
      this._timeUpdated();
    }

    if (changedProperties.has("_seconds")) {
      this._timeUpdated();
    }

    if (changedProperties.has("_useAmPm")) {
      this._timeUpdated();
    }

    if (changedProperties.has("_isPm")) {
      this._timeUpdated();
    }
  }

  private _hoursChanged(ev: CustomEvent<ClampedValue>) {
    ev.stopPropagation?.();
    this._hours = ev.detail.value;
  }

  private _minutesChanged(ev: CustomEvent<ClampedValue>) {
    ev.stopPropagation?.();
    this._minutes = ev.detail.value;
    if (ev.detail.clamped) {
      if (ev.detail.value === 0) {
        this._hoursChanged({
          detail: clampValue({
            value: this._hours - 1,
            min: this._useAmPm ? 1 : 0,
            max: this._useAmPm ? 12 : 23,
          }),
        } as CustomEvent<ClampedValue>);
        this._minutes = 59;
      }

      if (ev.detail.value === 59) {
        this._hoursChanged({
          detail: clampValue({
            value: this._hours + 1,
            min: this._useAmPm ? 1 : 0,
            max: this._useAmPm ? 12 : 23,
          }),
        } as CustomEvent<ClampedValue>);
        const hourMax = this._useAmPm ? 12 : 23;
        if (this._hours < hourMax) {
          this._minutes = 0;
        }
      }
    }
  }

  private _secondsChanged(ev: CustomEvent<ClampedValue>) {
    ev.stopPropagation?.();
    this._seconds = ev.detail.value;
    if (ev.detail.clamped) {
      if (ev.detail.value === 0) {
        this._minutesChanged({
          detail: clampValue({ value: this._minutes - 1, min: 0, max: 59 }),
        } as CustomEvent<ClampedValue>);
        this._seconds = 59;
      }

      if (ev.detail.value === 59) {
        this._minutesChanged({
          detail: clampValue({ value: this._minutes + 1, min: 0, max: 59 }),
        } as CustomEvent<ClampedValue>);
        const hourMax = this._useAmPm ? 12 : 23;
        if (!(this._hours === hourMax && this._minutes === 59)) {
          this._seconds = 0;
        }
      }
    }
  }

  private _toggleAmPm() {
    this._isPm = !this._isPm;
  }

  private _timeUpdated() {
    let hour24 = this._hours;

    if (this._useAmPm) {
      if (this._hours === 12) {
        hour24 = this._isPm ? 12 : 0;
      } else {
        hour24 = this._isPm ? this._hours + 12 : this._hours;
      }
    }

    const timeParts = [
      hour24.toString().padStart(2, "0"),
      this._minutes.toString().padStart(2, "0"),
      this._seconds.toString().padStart(2, "0"),
    ];

    const time = timeParts.join(":");
    if (time === this.value) {
      return;
    }
    this.value = time;
    fireEvent(this, "change");
    fireEvent(this, "value-changed", { value: time });
  }

  static styles = css`
    .time-picker-container {
      display: flex;
      flex-direction: row;
      align-items: center;
      gap: 4px;
    }

    .time-picker-separator {
      color: var(--primary-text-color);
    }
  `;
}

declare global {
  interface HTMLElementTagNameMap {
    "ha-time-picker": HaTimePicker;
  }
}