import * as colors from '../../00colors.js';
import { demoFunc } from './dees-progressbar.demo.js';
import {
  customElement,
  html,
  DeesElement,
  property,
  cssManager,
  css,
  state,
} from '@design.estate/dees-element';
import { themeDefaultStyles } from '../../00theme.js';

declare global {
  interface HTMLElementTagNameMap {
    'dees-progressbar': DeesProgressbar;
  }
}

@customElement('dees-progressbar')
export class DeesProgressbar extends DeesElement {
  public static demo = demoFunc;
  public static demoGroups = ['Feedback'];

  @property({
    type: Number,
  })
  accessor percentage = 0;

  // `value` and `progress` keep existing readme/internal usages working.
  @property({
    type: Number,
  })
  accessor value: number | null = null;

  @property({
    type: Number,
  })
  accessor progress: number | null = null;

  @property({
    type: String,
  })
  accessor label = '';

  @property({
    type: String,
  })
  accessor statusText = '';

  @property({
    type: Array,
  })
  accessor terminalLines: string[] = [];

  @property({
    type: Number,
  })
  accessor statusRows = 3;

  @property({
    type: Boolean,
  })
  accessor indeterminate = false;

  @property({
    type: Boolean,
  })
  accessor showPercentage = true;

  @state()
  accessor activeSpinnerFrame = 0;

  private spinnerIntervalId: number | null = null;
  private readonly spinnerFrames = ['|', '/', '-', '\\'];

  public static styles = [
    themeDefaultStyles,
    cssManager.defaultStyles,
    css`
      :host {
        display: block;
        color: ${cssManager.bdTheme(colors.bright.text, colors.dark.text)};
      }

      .progressBarContainer {
        min-width: 200px;
        padding: 8px;
        box-sizing: border-box;
      }

      .progressHeader {
        display: flex;
        justify-content: space-between;
        align-items: baseline;
        gap: 12px;
        margin-bottom: 8px;
      }

      .progressLabel {
        font-size: 14px;
        font-weight: 500;
        line-height: 1.3;
      }

      .progressValue {
        font-size: 12px;
        line-height: 1.3;
        color: ${cssManager.bdTheme('hsl(215 15% 40%)', 'hsl(215 15% 70%)')};
        font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
      }

      .progressBar {
        position: relative;
        overflow: hidden;
        width: 100%;
        height: 8px;
        border-radius: 999px;
        background: ${cssManager.bdTheme('#eeeeeb', '#444')};
        border-top: 0.5px solid ${cssManager.bdTheme('transparent', '#555')};
      }

      .progressBarFill {
        height: 100%;
        border-radius: inherit;
        background: ${cssManager.bdTheme(colors.dark.blueActive, colors.bright.blueActive)};
        transition: width 0.2s ease;
      }

      .progressBarFill.indeterminate {
        width: 34%;
        transition: none;
        animation: indeterminateSlide 1.2s ease-in-out infinite;
      }

      .statusPanel {
        margin-top: 10px;
        height: calc(var(--status-rows, 3) * 1.35em + 16px);
        min-height: calc(var(--status-rows, 3) * 1.35em + 16px);
        padding: 8px 10px;
        box-sizing: border-box;
        border-radius: 8px;
        border: 1px solid ${cssManager.bdTheme('hsl(210 20% 86%)', 'hsl(210 10% 26%)')};
        background: ${cssManager.bdTheme('hsl(210 33% 98%)', 'hsl(220 20% 10%)')};
        font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
        font-size: 12px;
        line-height: 1.35;
        overflow: hidden;
      }

      .statusTextRow,
      .terminalLine {
        display: flex;
        align-items: flex-start;
        gap: 8px;
        min-height: 1.35em;
      }

      .terminalScroller {
        height: 100%;
        overflow: auto;
      }

      .terminalScroller::-webkit-scrollbar {
        width: 6px;
      }

      .terminalScroller::-webkit-scrollbar-thumb {
        background: ${cssManager.bdTheme('hsl(215 18% 78%)', 'hsl(215 10% 34%)')};
        border-radius: 999px;
      }

      .terminalScroller::-webkit-scrollbar-track {
        background: transparent;
      }

      .linePrefix {
        width: 1ch;
        flex: 0 0 1ch;
        color: ${cssManager.bdTheme(colors.dark.blueActive, colors.bright.blueActive)};
        text-align: center;
      }

      .lineText {
        flex: 1;
        min-width: 0;
        color: ${cssManager.bdTheme('hsl(220 15% 25%)', 'hsl(210 15% 86%)')};
        white-space: pre-wrap;
        word-break: break-word;
      }

      .terminalLine:not(.current) .lineText {
        color: ${cssManager.bdTheme('hsl(215 12% 42%)', 'hsl(215 12% 63%)')};
      }

      @keyframes indeterminateSlide {
        0% {
          transform: translateX(-120%);
        }

        100% {
          transform: translateX(320%);
        }
      }
    `,
  ];

  public async connectedCallback(): Promise<void> {
    await super.connectedCallback();
    this.syncSpinnerState();
  }

  public async disconnectedCallback(): Promise<void> {
    this.stopSpinner();
    await super.disconnectedCallback();
  }

  public updated(changedProperties: Map<string | number | symbol, unknown>): void {
    super.updated(changedProperties);
    this.syncSpinnerState();

    if (changedProperties.has('terminalLines') && this.terminalLines.length > 0) {
      this.scrollTerminalToBottom();
    }
  }

  public render() {
    const effectivePercentage = this.getEffectivePercentage();
    const showHeader = Boolean(this.label) || (this.showPercentage && !this.indeterminate);
    const hasTerminalLines = this.terminalLines.length > 0;
    const hasStatusContent = hasTerminalLines || this.statusText.trim().length > 0;
    const renderedRows = this.getRenderedStatusRows();
    const spinnerFrame = this.spinnerFrames[this.activeSpinnerFrame] ?? this.spinnerFrames[0];

    return html`
      <div class="progressBarContainer">
        ${showHeader ? html`
          <div class="progressHeader">
            <div class="progressLabel">${this.label}</div>
            ${this.showPercentage && !this.indeterminate ? html`
              <div class="progressValue">${this.formatPercentage(effectivePercentage)}%</div>
            ` : ''}
          </div>
        ` : ''}
        <div class="progressBar">
          <div
            class="progressBarFill ${this.indeterminate ? 'indeterminate' : ''}"
            style="${this.indeterminate ? '' : `width: ${effectivePercentage}%;`}"
          ></div>
        </div>
        ${hasStatusContent ? html`
          <div
            class="statusPanel"
            style="--status-rows: ${renderedRows};"
            aria-live="polite"
            aria-atomic="true"
          >
            ${hasTerminalLines ? html`
              <div class="terminalScroller">
                ${this.terminalLines.map((line, index) => {
                  const isCurrentLine = index === this.terminalLines.length - 1;
                  const prefix = this.indeterminate && isCurrentLine ? spinnerFrame : '>';
                  return html`
                    <div class="terminalLine ${isCurrentLine ? 'current' : ''}">
                      <span class="linePrefix">${prefix}</span>
                      <span class="lineText">${line}</span>
                    </div>
                  `;
                })}
              </div>
            ` : html`
              <div class="statusTextRow">
                <span class="linePrefix">${this.indeterminate ? spinnerFrame : '>'}</span>
                <span class="lineText">${this.statusText}</span>
              </div>
            `}
          </div>
        ` : ''}
      </div>
    `;
  }

  private getEffectivePercentage(): number {
    if (typeof this.value === 'number' && Number.isFinite(this.value)) {
      return this.clampPercentage(this.value);
    }

    if (typeof this.progress === 'number' && Number.isFinite(this.progress)) {
      const normalizedProgress = this.progress >= 0 && this.progress <= 1
        ? this.progress * 100
        : this.progress;
      return this.clampPercentage(normalizedProgress);
    }

    return this.clampPercentage(this.percentage);
  }

  private getRenderedStatusRows(): number {
    const rows = Number.isFinite(this.statusRows) ? Math.floor(this.statusRows) : 3;
    return Math.max(1, rows);
  }

  private clampPercentage(input: number): number {
    return Math.max(0, Math.min(100, input));
  }

  private formatPercentage(input: number): string {
    return Number.isInteger(input) ? `${input}` : input.toFixed(1).replace(/\.0$/, '');
  }

  private syncSpinnerState(): void {
    const shouldAnimate = this.indeterminate && (this.statusText.trim().length > 0 || this.terminalLines.length > 0);

    if (shouldAnimate && this.spinnerIntervalId === null) {
      this.spinnerIntervalId = window.setInterval(() => {
        this.activeSpinnerFrame = (this.activeSpinnerFrame + 1) % this.spinnerFrames.length;
      }, 120);
      return;
    }

    if (!shouldAnimate) {
      this.stopSpinner();
    }
  }

  private stopSpinner(): void {
    if (this.spinnerIntervalId !== null) {
      window.clearInterval(this.spinnerIntervalId);
      this.spinnerIntervalId = null;
    }

    this.activeSpinnerFrame = 0;
  }

  private scrollTerminalToBottom(): void {
    const terminalScroller = this.shadowRoot?.querySelector('.terminalScroller') as HTMLElement | null;

    if (!terminalScroller) {
      return;
    }

    window.requestAnimationFrame(() => {
      terminalScroller.scrollTop = terminalScroller.scrollHeight;
    });
  }
}