/**
 * content for invoices
 */

import {
  DeesElement,
  property,
  html,
  customElement,
  type TemplateResult,
  css,
  cssManager,
  unsafeCSS,
  render,
} from '@design.estate/dees-element';
import * as domtools from '@design.estate/dees-domtools';

import * as plugins from '../plugins.js';

import * as shared from './shared/index.js';


declare global {
  interface HTMLElementTagNameMap {
    'dedocument-contentinvoice': DeContentInvoice;
  }
}

@customElement('dedocument-contentinvoice')
export class DeContentInvoice extends DeesElement {
  public static demo = () => html`
    <style>
      .demoContainer {
        background: white;
        padding: 50px;
      }
    </style>
    <div class="demoContainer">
      <dedocument-contentinvoice></dedocument-contentinvoice>
    </div>
  `;

  @property({
    type: Object,
    reflect: true,
  })
  public letterData: plugins.tsclass.business.ILetter;

  constructor() {
    super();
    domtools.DomTools.setupDomTools();
  }

  public static styles = [
    domtools.elementBasic.staticStyles,
    css`
      :host {
        color: #333;
      }

      .trimmedContent {
        display: none;
      }

      .repeatedContent {
      }
    `,
  ];

  public render(): TemplateResult {
    return html`
      <div class="trimmedContent"></div>
      <div class="repeatedContent"></div>
      <div class="currentContent"></div>
    `;
  }

  public getTotalNet = (): number => {
    let totalNet = 0;

    if (!this.letterData) {
      return totalNet;
    }

    for (const item of this.letterData.content.invoiceData.items) {
      totalNet += item.unitNetPrice * item.unitQuantity;
    }
    return totalNet;
  };

  public getTotalGross = (): number => {
    let totalVat = 0;

    if (!this.letterData) {
      return totalVat;
    }

    for (const taxgroup of this.getVatGroups()) {
      totalVat += taxgroup.vatAmountSum;
    }
    return this.getTotalNet() + totalVat;
  };

  public getVatGroups = () => {
    const vatGroups: {
      vatPercentage: number;
      items: plugins.tsclass.finance.IInvoice['items'];
      vatAmountSum: number;
    }[] = [];

    if (!this.letterData) {
      return vatGroups;
    }

    const taxAmounts: number[] = [];
    for (const item of this.letterData.content.invoiceData.items) {
      taxAmounts.includes(item.vatPercentage) ? null : taxAmounts.push(item.vatPercentage);
    }

    for (const taxAmount of taxAmounts) {
      const matchingItems = this.letterData.content.invoiceData.items.filter(
        (itemArg) => itemArg.vatPercentage === taxAmount
      );
      let sum = 0;
      for (const matchingItem of matchingItems) {
        sum += matchingItem.unitNetPrice * matchingItem.unitQuantity * (taxAmount / 100);
      }
      vatGroups.push({
        items: matchingItems,
        vatPercentage: taxAmount,
        vatAmountSum: Math.round(sum * 100) / 100,
      });
    }
    return vatGroups;
  };

  public async getContentNodes() {
    await this.elementDomReady;
    return {
      currentContent: this.shadowRoot.querySelector('.currentContent') as HTMLElement,
      trimmedContent: this.shadowRoot.querySelector('.trimmedContent') as HTMLElement,
      repeatedContent: this.shadowRoot.querySelector('.repeatedContent') as HTMLElement,
    };
  }

  public async getContentLength() {
    await this.elementDomReady;
    return (await this.getContentNodes()).currentContent.children.length;
  }

  public async trimEndByOne() {
    await this.elementDomReady;
    this.shadowRoot
      .querySelector('.trimmedContent')
      .append(
        (await this.getContentNodes()).currentContent.children.item(
          (await this.getContentNodes()).currentContent.children.length - 1
        )
      );
  }

  public async trimStartToOffset(contentOffsetArg: number) {
    await this.elementDomReady;
    const beginningLength = (await this.getContentNodes()).currentContent.children.length;
    while (
      (await this.getContentNodes()).currentContent.children.length !==
      beginningLength - contentOffsetArg
    ) {
      (await this.getContentNodes()).trimmedContent.append(
        (await this.getContentNodes()).currentContent.children.item(0)
      );
      console.log('hey' + this.shadowRoot.children.length);
    }
    if (
      (await this.getContentNodes()).currentContent.children
        .item(0)
        .classList.contains('needsDataHeader')
    ) {
      const trimmedContent = (await this.getContentNodes()).trimmedContent;
      let startPoint = trimmedContent.children.length;
      while (startPoint > 0) {
        const element = trimmedContent.children.item(startPoint - 1);
        if (element.classList.contains('dataHeader')) {
          (await this.getContentNodes()).repeatedContent.append(element);
          break;
        }
        startPoint--;
      }
    }
  }

  public async firstUpdated(_changedProperties: Map<string | number | symbol, unknown>) {
    super.firstUpdated(_changedProperties);
    this.attachInvoiceDom();
  }

  public async attachInvoiceDom() {
    const contentNodes = await this.getContentNodes();
    render(
      html`
        <style>
          .grid {
            display: grid;
            grid-template-columns: 40px auto 80px 80px 90px 90px;
          }
          .topLine {
            margin-top: 5px;
            background: #e7e7e7;
            font-weight: bold;
          }
          .lineItem {
            font-size: 12px;
            padding: 5px;
          }

          .invoiceLine {
            border-bottom: 1px dotted #ccc;
          }

          .sums {
            margin-top: 5px;
            font-size: 12px;
            padding-left: 50%;
          }

          .sums .sumline {
            margin-top: 3px;
            display: grid;
            grid-template-columns: auto 90px;
          }

          .sums .sumline .label {
            padding: 2px 5px;
            border-right: 1px solid #ccc;
            text-align: right;
            font-weight: bold;
          }

          .sums .sumline .value {
            padding: 2px 5px;
            font-weight: bold;
          }

          .divider {
            margin-top: 8px;
            border-top: 1px dotted #ccc;
          }

          .taxNote {
            font-size: 12px;
            padding: 4px;
            background: #eeeeeb;
            text-align: center;
          }

          .infoBox {
            border-radius: 7px;
            border: 1px solid #ddd;
            border-left: 3px solid #c5e1a5;
            padding: 8px;
            margin-top: 16px;
            line-height: 1.4em;
            font-size: 16px;
          }

          .infoBox .label {
            padding-bottom: 2px;
            font-size: 12px;
            font-weight: bold;
          }

          .paymentCode {
            text-align: center;
            border-left: 2px solid #666;
          }
        </style>
        <div>We hereby invoice products and services provided to you by Lossless GmbH:</div>
        <div class="grid topLine dataHeader">
          <div class="lineItem">Item Pos.</div>
          <div class="lineItem">Description</div>
          <div class="lineItem">Quantity</div>
          <div class="lineItem">Unit Type</div>
          <div class="lineItem">Unit Net Price</div>
          <div class="lineItem">Total Net Price</div>
        </div>
        ${(() => {
          let counter = 1;
          return this.letterData?.content.invoiceData?.items?.map(
            (invoiceItem) => html`
              <div class="grid invoiceLine needsDataHeader">
                <div class="lineItem">${counter++}</div>
                <div class="lineItem">${invoiceItem.name}</div>
                <div class="lineItem">${invoiceItem.unitQuantity}</div>
                <div class="lineItem">${invoiceItem.unitType}</div>
                <div class="lineItem">${invoiceItem.unitNetPrice} ${this.letterData?.content.invoiceData.currency}</div>
                <div class="lineItem">
                  ${invoiceItem.unitQuantity * invoiceItem.unitNetPrice} ${this.letterData?.content.invoiceData.currency}
                </div>
              </div>
            `
          );
        })()}
        <div class="sums">
          <div class="sumline">
            <div class="label">Total net</div>
            <div class="value">${this.getTotalNet()} EUR</div>
          </div>
          ${this.getVatGroups().map((vatGroupArg) => {
            let itemNumbers = '';
            for (const item of vatGroupArg.items) {
              const itemIndex = this.letterData.content.invoiceData.items.indexOf(item);
              itemNumbers += ` ${itemIndex + 1},`;
            }
            return html`
              <div class="sumline">
                <div class="label">
                  Vat ${vatGroupArg.vatPercentage}%<br />
                  <span style="font-weight: normal">(on item positions: ${itemNumbers})</span>
                </div>
                <div class="value">${vatGroupArg.vatAmountSum} EUR</div>
              </div>
            `;
          })}
          <div class="sumline">
            <div class="label">Total gross</div>
            <div class="value">${this.getTotalGross()} EUR</div>
          </div>
        </div>
        <div class="divider"></div>
        ${this.letterData?.content.invoiceData.reverseCharge
          ? html`
              <div class="taxNote">
                VAT arises on a reverse charge basis and is payable by the customer.
              </div>
            `
          : ``}
        <div class="infoBox">
          <div class="label">Payment Terms:</div>
          Payment is due within 30 days starting from the reception of this invoice. Please use the
          following SEPA details:
          <br /><br />
          Beneficiary: ${this.letterData?.from.name}<br />
          IBAN: ${this.letterData?.from?.sepaConnection?.iban}<br />
          BIC: ${this.letterData?.from?.sepaConnection?.bic}<br />
          Description: ${this.letterData?.content.invoiceData?.id}<br />
          Amount: ${this.getTotalGross()} ${this.letterData?.content.invoiceData.currency}
        </div>
        ${this.letterData?.content?.contractData?.contractDate
          ? html`
              <div class="infoBox">
                <div class="label">Referenced contract:</div>
                This invoice is adhering to agreements made by contract between the parties on
                ${plugins.smarttime.ExtendedDate.fromMillis(this.letterData?.content.contractData.contractDate).format('MMMM D, YYYY')}.
              </div>
            `
          : html``}
        <div class="infoBox paymentCode">
          <div class="label">Sepa Payment Code:</div>
        </div>
      `,
      contentNodes.currentContent
    );
    const canvas = document.createElement('canvas');
    plugins.qrcode.toCanvas(
      canvas,
      `BCD
001
1
SCT
${this.letterData.content.invoiceData.billedBy.sepaConnection.bic}
${this.letterData.content.invoiceData.billedBy.name}
${this.letterData.content.invoiceData.billedBy.sepaConnection.iban}
EUR${this.getTotalGross()}
CHAR
${this.letterData.content.invoiceData.id}
${this.letterData.content.invoiceData.id}
EPC QR Code`,
      (error) => {
        if (error) console.error(error);
        console.log('success!');
      }
    );
    contentNodes.currentContent.querySelector('.paymentCode').append(canvas);
  }
}