function offersPage() {
  const buttonStartCreateOffer = document.getElementById(
    'button-start-create-offer'
  );
  const buttonViewMyOffers = document.getElementById('button-view-my-offers');
  const closeOffer = document.getElementById('close-offer');
  const createOfferModalRoot = document.getElementById(
    'create-offer-modal-root'
  );
  const viewMyOffersRoot = document.getElementById('view-my-offers-root');
  const buyOrSellButtonGroup = document.getElementById(
    'button-group-buy-or-sell'
  );
  const buyOrSellButtons = buyOrSellButtonGroup.querySelectorAll('button');
  const buyButton = document.getElementById('button-buy-bitcoin');
  const sellButton = document.getElementById('button-sell-bitcoin');

  const premiumValue = document.getElementById('premium-value');
  const buttonIncreasePremium = document.getElementById(
    'button-increase-premium'
  );

  const buttonDecreasePremium = document.getElementById(
    'button-decrease-premium'
  );

  const eurAmountInput = document.getElementById('input-eur-amount');
  const btcAmountInput = document.getElementById('input-btc-amount');

  const placeInput = document.getElementById('place-input');
  const timeInput = document.getElementById('time-input');

  const onchainCheckbox = document.getElementById('onchain-checkbox');
  const lightningCheckbox = document.getElementById('lightning-checkbox');

  const btcMethodCheckboxes = [onchainCheckbox, lightningCheckbox];

  const myTrustedCheckbox = document.getElementById('my-trusted-checkbox');
  const myTrustedTrustedCheckbox = document.getElementById(
    'my-trusted-trusted-checkbox'
  );
  const allMembersCheckbox = document.getElementById('all-members-checkbox');

  const bigNotesAcceptedCheckbox = document.getElementById(
    'large-bills-checkbox'
  );

  const publishOfferButton = document.getElementById('button-submit-offer');

  const offerCreatedPopup = document.getElementById(
    'offer-created-confirmation'
  );
  const offerDeletedPopup = document.getElementById(
    'offer-deleted-confirmation'
  );

  const ownOffersContainer = document.getElementById('own-offers-container');

  function toggleCreateOfferModal() {
    createOfferModalRoot.classList.toggle('shown');
  }

  function toggleViewMyOffersPanel() {
    viewMyOffersRoot.style.display =
      viewMyOffersRoot.style.display === 'block' ? 'none' : 'block';
  }

  function modifyPremiumValue(delta) {
    const regexExpression = /-*\d+/;
    const numValue = parseInt(premiumValue.innerText.match(regexExpression)[0]);

    const newValue = `${numValue + delta}%`;

    premiumValue.innerText = newValue;
  }

  function toggleBuyOrSellButtonGroup() {
    buyOrSellButtons.forEach((button) => {
      if (button.classList.contains('selected')) {
        button.classList.remove('selected');
      } else {
        button.classList.add('selected');
      }
    });
  }

  function readIntFromEurAmountInput() {
    const eurAmountFieldValue = eurAmountInput.value;
    const regularExpression = /([\d\s]+)/;
    const matchResult = eurAmountFieldValue.match(regularExpression);

    if (!matchResult) {
      return null;
    }

    const numberString = matchResult[1];
    const cleanInputNumber = parseInt(numberString.replace(/\s/gi, ''));

    return cleanInputNumber;
  }

  function validateAndFormatEurAmountInput() {
    const cleanInputNumber = readIntFromEurAmountInput();
    eurAmountInput.classList.remove('input-is-valid', 'input-is-invalid');
    if (cleanInputNumber) {
      eurAmountInput.value = formatNumberWithSpaces(cleanInputNumber);
      eurAmountInput.classList.add('input-is-valid');
      return;
    }

    eurAmountInput.classList.add('input-is-invalid');
  }

  function updateBtcInput() {
    const eurToSatRate = 1021;
    const cleanEurAmount = readIntFromEurAmountInput();

    const satsAmount = cleanEurAmount * eurToSatRate;
    const formattedSatsAmount = formatNumberWithSpaces(satsAmount);
    btcAmountInput.value = formattedSatsAmount;
  }

  function validateBitcoinMethodCheckboxes(clickedCheckbox) {
    let checkedCount = btcMethodCheckboxes.filter((cb) => cb.checked).length;
    if (checkedCount === 0) {
      clickedCheckbox.checked = true;
    }
  }

  function applyTrustCheckboxConstraints(pressedCheckbox) {
    if (pressedCheckbox === myTrustedTrustedCheckbox) {
      console.log('first case!');
      if (!myTrustedTrustedCheckbox.checked && allMembersCheckbox.checked) {
        allMembersCheckbox.checked = false;
      }
    }

    if (pressedCheckbox === allMembersCheckbox) {
      console.log('second case!');
      if (!myTrustedTrustedCheckbox.checked && allMembersCheckbox.checked) {
        myTrustedTrustedCheckbox.checked = true;
      }
    }
  }

  async function publishOffer() {
    let wants;
    if (buyButton.classList.contains('selected')) {
      wants = 'BTC';
    }
    if (sellButton.classList.contains('selected')) {
      wants = 'EUR';
    }

    const premium = parseInt(premiumValue.innerText.match(/\d+/)[0]) / 100;
    const trade_amount_eur = eurAmountInput.value;
    const location_details = placeInput.value;
    const time_availability_details = timeInput.value;
    const is_onchain_accepted = onchainCheckbox.checked;
    const is_lightning_accepted = lightningCheckbox.checked;
    const show_offer_to_trusted = myTrustedCheckbox.checked;
    const show_offer_to_trusted_trusted = myTrustedTrustedCheckbox.checked;
    const show_offer_to_all_members = allMembersCheckbox.checked;
    const are_big_notes_accepted = bigNotesAcceptedCheckbox.checked;

    const offerDetails = {
      wants,
      premium,
      trade_amount_eur,
      location_details,
      time_availability_details,
      is_onchain_accepted,
      is_lightning_accepted,
      show_offer_to_trusted,
      show_offer_to_trusted_trusted,
      show_offer_to_all_members,
      are_big_notes_accepted,
    };

    await fetch('/api/offer', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({ offerDetails }),
    });

    toggleOfferCreatedAlert();

    toggleCreateOfferModal();
  }

  function toggleOfferCreatedAlert() {
    offerCreatedPopup.classList.remove('max-size-zero');
    offerCreatedPopup.classList.add('revealed');
    setTimeout(() => {
      offerCreatedPopup.classList.remove('revealed');
    }, 3000);
    setTimeout(() => {
      offerCreatedPopup.classList.add('max-size-zero');
    }, 4000);
  }

  function toggleOfferDeletedAlert() {
    offerDeletedPopup.classList.remove('max-size-zero');
    offerDeletedPopup.classList.add('revealed');
    setTimeout(() => {
      offerDeletedPopup.classList.remove('revealed');
    }, 3000);
    setTimeout(() => {
      offerDeletedPopup.classList.add('max-size-zero');
    }, 4000);
  }

  class Offer {
    constructor(offerData) {
      this.uuid = offerData.uuid;
      this.public_key = offerData.public_key;
      this.wants = offerData.wants;
      this.premium = offerData.premium;
      this.trade_amount_eur = offerData.trade_amount_eur;
      this.location_details = offerData.location_details;
      this.time_availability_details = offerData.time_availability_details;
      this.show_offer_to_trusted = offerData.show_offer_to_trusted;
      this.show_offer_to_trusted_trusted =
        offerData.show_offer_to_trusted_trusted;
      this.show_offer_to_all_members = offerData.show_offer_to_all_members;
      this.is_onchain_accepted = offerData.is_onchain_accepted;
      this.is_lightning_accepted = offerData.is_lightning_accepted;
      this.are_big_notes_accepted = offerData.are_big_notes_accepted;
      this.created_at = offerData.created_at;
      this.last_updated_at = offerData.last_updated_at;
    }

    buildHTML() {
      const offerCard = document.createElement('div');
      offerCard.classList.add('myoffer-card');
      offerCard.classList.add('shadowed-round-area');

      const tradeDescDiv = document.createElement('div');
      tradeDescDiv.classList.add('trade-desc');

      const youBuyText = document.createElement('p');
      youBuyText.classList.add('offer-card-content-title');
      youBuyText.innerText = 'Compras';
      tradeDescDiv.append(youBuyText);

      const youBuyData = document.createElement('p');
      youBuyData.classList.add('offer-card-content-data');
      if (this.wants === 'BTC') {
        youBuyData.innerText = `${this.trade_amount_eur * 1021} sats`;
      }
      if (this.wants === 'EUR') {
        youBuyData.innerText = `${this.trade_amount_eur} €`;
      }
      tradeDescDiv.append(youBuyData);

      const youSellText = document.createElement('p');
      youSellText.id = 'you-sell-title';
      youSellText.classList.add('offer-card-content-title');
      youSellText.innerText = 'Vendes';
      tradeDescDiv.append(youSellText);

      const youSellData = document.createElement('p');
      youSellData.classList.add('offer-card-content-data');
      if (this.wants === 'BTC') {
        youSellData.innerText = `${this.trade_amount_eur} €`;
      }
      if (this.wants === 'EUR') {
        youSellData.innerText = `${this.trade_amount_eur * 1021} sats`;
      }
      tradeDescDiv.append(youSellData);

      const premiumDescDiv = document.createElement('div');
      premiumDescDiv.classList.add('premium-desc');

      const premiumTitle = document.createElement('p');
      premiumTitle.classList.add('offer-card-content-title');
      premiumTitle.innerText = 'Premium';
      premiumDescDiv.append(premiumTitle);

      const premiumData = document.createElement('p');
      premiumData.classList.add('offer-card-content-data');
      premiumData.innerText = `${this.premium * 100} %`;
      premiumDescDiv.append(premiumData);

      const offerPriceTitle = document.createElement('p');
      offerPriceTitle.classList.add('offer-card-content-title');
      offerPriceTitle.innerText = 'Precio oferta';
      premiumDescDiv.append(offerPriceTitle);

      const offerPriceData = document.createElement('p');
      offerPriceData.classList.add('offer-card-content-data');
      offerPriceData.innerText = `90000 €/BTC`;
      premiumDescDiv.append(offerPriceData);

      const marketPriceTitle = document.createElement('p');
      marketPriceTitle.classList.add('offer-card-content-title');
      marketPriceTitle.innerText = 'Precio mercado';
      premiumDescDiv.append(marketPriceTitle);

      const marketPriceData = document.createElement('p');
      marketPriceData.innerText = `88000 €/BTC`;
      premiumDescDiv.append(marketPriceData);

      const whereDescDiv = document.createElement('div');
      whereDescDiv.classList.add('where-desc');

      const whereDescTitle = document.createElement('p');
      whereDescTitle.classList.add('offer-card-content-title');
      whereDescTitle.innerText = 'Dónde';
      whereDescDiv.append(whereDescTitle);

      const whereDescData = document.createElement('p');
      whereDescData.classList.add('offer-long-text');
      whereDescData.innerText = `${this.location_details}`;
      whereDescDiv.append(whereDescData);

      const whenDescDiv = document.createElement('div');
      whenDescDiv.classList.add('when-desc');

      const whenDescTitle = document.createElement('p');
      whenDescTitle.classList.add('offer-card-content-title');
      whenDescTitle.innerText = 'Cúando';
      whenDescDiv.append(whenDescTitle);

      const whenDescData = document.createElement('p');
      whenDescData.classList.add('offer-long-text');
      whenDescData.innerText = `${this.time_availability_details}`;
      whenDescDiv.append(whenDescData);

      const bitcoinMethodsDiv = document.createElement('div');
      bitcoinMethodsDiv.classList.add('bitcoin-methods-desc');

      const bitcoinMethodsTitle = document.createElement('p');
      bitcoinMethodsTitle.classList.add('offer-card-content-title');
      bitcoinMethodsTitle.innerText = 'Protocolos Bitcoin aceptados';
      bitcoinMethodsDiv.append(bitcoinMethodsTitle);

      const onchainAcceptedContainer = document.createElement('div');
      onchainAcceptedContainer.classList.add('left-icon-checkboxed-field');
      if (this.is_onchain_accepted) {
        const onchainIcon = document.createElement('img');
        onchainIcon.src = '/img/chains-lasecagold.svg';
        const onchainText = document.createElement('p');
        onchainText.innerText = 'Onchain';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-check-green.svg';

        onchainAcceptedContainer.append(onchainIcon, onchainText, checkIcon);
      } else {
        const onchainIcon = document.createElement('img');
        onchainIcon.src = '/img/chains-gray.svg';
        const onchainText = document.createElement('p');
        onchainText.innerText = 'Onchain';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-xmark-gray.svg';

        onchainAcceptedContainer.append(onchainIcon, onchainText, checkIcon);
      }
      const lightningAcceptedContainer = document.createElement('div');

      lightningAcceptedContainer.classList.add('left-icon-checkboxed-field');
      if (this.is_lightning_accepted) {
        const lightningIcon = document.createElement('img');
        lightningIcon.src = '/img/bolt-lightning-lasecagold.svg';
        const lightningText = document.createElement('p');
        lightningText.innerText = 'Lightning';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-check-green.svg';

        lightningAcceptedContainer.append(
          lightningIcon,
          lightningText,
          checkIcon
        );
      } else {
        const lightningIcon = document.createElement('img');
        lightningIcon.src = '/img/bolt-lightning-gray.svg';
        const lightningText = document.createElement('p');
        lightningText.innerText = 'Lightning';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-xmark-gray.svg';

        lightningAcceptedContainer.append(
          lightningIcon,
          lightningText,
          checkIcon
        );
      }

      bitcoinMethodsDiv.append(
        onchainAcceptedContainer,
        lightningAcceptedContainer
      );

      const visibilityDiv = document.createElement('div');
      visibilityDiv.classList.add('visibility-desc');

      const visibilityTitle = document.createElement('p');
      visibilityTitle.classList.add('offer-card-content-title');
      visibilityTitle.innerText = 'Visibilidad';
      visibilityDiv.append(visibilityTitle);

      const showOfferToTrustedContainer = document.createElement('div');
      showOfferToTrustedContainer.classList.add('right-icon-checkboxed-field');

      if (this.show_offer_to_trusted) {
        const showOfferToTrustedIcon = document.createElement('img');
        showOfferToTrustedIcon.src = '/img/user-lasecagold.svg';
        const showOfferToTrustedText = document.createElement('p');
        showOfferToTrustedText.innerText = 'Confiados';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-check-green.svg';

        showOfferToTrustedContainer.append(
          showOfferToTrustedIcon,
          showOfferToTrustedText,
          checkIcon
        );
      } else {
        const showOfferToTrustedIcon = document.createElement('img');
        showOfferToTrustedIcon.src = '/img/user-gray.svg';
        const showOfferToTrustedText = document.createElement('p');
        showOfferToTrustedText.innerText = 'Confiados';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-xmark-gray.svg';

        showOfferToTrustedContainer.append(
          showOfferToTrustedIcon,
          showOfferToTrustedText,
          checkIcon
        );
      }

      const showOfferToTrustedTrustedContainer = document.createElement('div');
      showOfferToTrustedTrustedContainer.classList.add(
        'right-icon-checkboxed-field'
      );

      if (this.show_offer_to_trusted_trusted) {
        const showOfferToTrustedTrustedIcon = document.createElement('img');
        showOfferToTrustedTrustedIcon.src = '/img/user-group-lasecagold.svg';
        const showOfferToTrustedTrustedText = document.createElement('p');
        showOfferToTrustedTrustedText.innerText = 'Sus confiados';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-check-green.svg';

        showOfferToTrustedTrustedContainer.append(
          showOfferToTrustedTrustedIcon,
          showOfferToTrustedTrustedText,
          checkIcon
        );
      } else {
        const showOfferToTrustedTrustedIcon = document.createElement('img');
        showOfferToTrustedTrustedIcon.src = '/img/user-group-gray.svg';
        const showOfferToTrustedTrustedText = document.createElement('p');
        showOfferToTrustedTrustedText.innerText = 'Sus confiados';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-xmark-gray.svg';

        showOfferToTrustedTrustedContainer.append(
          showOfferToTrustedTrustedIcon,
          showOfferToTrustedTrustedText,
          checkIcon
        );
      }

      const showOfferToAllMembersContainer = document.createElement('div');
      showOfferToAllMembersContainer.classList.add(
        'right-icon-checkboxed-field'
      );

      if (this.show_offer_to_all_members) {
        const showOfferToAllMembersIcon = document.createElement('img');
        showOfferToAllMembersIcon.src = '/img/many-users-lasecagold.svg';
        const showOfferToAllMembersText = document.createElement('p');
        showOfferToAllMembersText.innerText = 'Todos';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-check-green.svg';

        showOfferToAllMembersContainer.append(
          showOfferToAllMembersIcon,
          showOfferToAllMembersText,
          checkIcon
        );
      } else {
        const showOfferToAllMembersIcon = document.createElement('img');
        showOfferToAllMembersIcon.src = '/img/many-users-gray.svg';
        const showOfferToAllMembersText = document.createElement('p');
        showOfferToAllMembersText.innerText = 'Todos';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-xmark-gray.svg';

        showOfferToAllMembersContainer.append(
          showOfferToAllMembersIcon,
          showOfferToAllMembersText,
          checkIcon
        );
      }
      visibilityDiv.append(
        showOfferToTrustedContainer,
        showOfferToTrustedTrustedContainer,
        showOfferToAllMembersContainer
      );

      const otherOfferFeaturesDiv = document.createElement('div');
      otherOfferFeaturesDiv.classList.add('other-desc');

      const otherOfferFeaturesTitle = document.createElement('p');
      otherOfferFeaturesTitle.classList.add('offer-card-content-title');
      otherOfferFeaturesTitle.innerText = 'Otros';
      otherOfferFeaturesDiv.append(otherOfferFeaturesTitle);

      const areBigNotesAcceptedContainer = document.createElement('div');
      areBigNotesAcceptedContainer.classList.add('left-icon-checkboxed-field');

      if (this.are_big_notes_accepted) {
        const areBigNotesAcceptedIcon = document.createElement('img');
        areBigNotesAcceptedIcon.src = '/img/eur-bill-lasecagold.svg';
        const areBigNotesAcceptedText = document.createElement('p');
        areBigNotesAcceptedText.innerText = 'Billetes grandes';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-check-green.svg';

        areBigNotesAcceptedContainer.append(
          areBigNotesAcceptedIcon,
          areBigNotesAcceptedText,
          checkIcon
        );
      } else {
        const areBigNotesAcceptedIcon = document.createElement('img');
        areBigNotesAcceptedIcon.src = '/img/eur-bill-gray.svg';
        const areBigNotesAcceptedText = document.createElement('p');
        areBigNotesAcceptedText.innerText = 'Billetes grandes';
        const checkIcon = document.createElement('img');
        checkIcon.src = '/img/circle-xmark-gray.svg';

        areBigNotesAcceptedContainer.append(
          areBigNotesAcceptedIcon,
          areBigNotesAcceptedText,
          checkIcon
        );
      }

      otherOfferFeaturesDiv.append(areBigNotesAcceptedContainer);

      const actionButtonsArea = document.createElement('p');
      actionButtonsArea.classList.add('offer-action-buttons-area');

      const editActionArea = document.createElement('div');
      editActionArea.classList.add('offer-action-area');
      editActionArea.classList.add('subtle-box');
      const editActionIcon = document.createElement('img');
      editActionIcon.src = '/img/edit.svg';
      const editActionText = document.createElement('p');
      editActionText.innerText = 'Editar';
      editActionArea.append(editActionIcon, editActionText);

      const deleteActionArea = document.createElement('div');
      deleteActionArea.classList.add('offer-action-area');
      deleteActionArea.classList.add('subtle-box');
      const deleteActionIcon = document.createElement('img');
      deleteActionIcon.src = '/img/trash-can-darkred.svg';
      const deleteActionText = document.createElement('p');
      deleteActionText.innerText = 'Eliminar';
      deleteActionArea.append(deleteActionIcon, deleteActionText);
      deleteActionArea.addEventListener('click', async () => {
        await deleteOfferByUuid(this.uuid);
        await myOffers.getOffersFromApi();
        await myOffers.render();
        toggleOfferDeletedAlert();
      });

      actionButtonsArea.append(editActionArea, deleteActionArea);

      offerCard.append(
        tradeDescDiv,
        premiumDescDiv,
        whereDescDiv,
        whenDescDiv,
        bitcoinMethodsDiv,
        visibilityDiv,
        otherOfferFeaturesDiv,
        actionButtonsArea
      );

      return offerCard;
    }
  }

  class MyOffers {
    constructor(ownOffersContainerElement) {
      this.ownOffersContainerElement = ownOffersContainerElement;
      this.offers = [];
    }

    async getOffersFromApi() {
      const offersResponse = await fetch('/api/publickey-offers');

      this.offers = [];

      const offersData = (await offersResponse.json()).data;
      if (offersResponse.ok) {
        for (const record of offersData) {
          this.offers.push(new Offer(record));
        }
      }
    }

    async render() {
      if (this.offers.length === 0) {
        this.ownOffersContainerElement.innerHTML =
          '<p class="shadowed-round-area">Vaya, no hay nada por aquí...</p>';
        return;
      }
      this.ownOffersContainerElement.innerHTML = '';

      for (const someOffer of this.offers) {
        this.ownOffersContainerElement.append(someOffer.buildHTML());
      }
    }
  }

  async function deleteOfferByUuid(offerUuid) {
    await fetch(`/api/offer/${offerUuid}`, {
      method: 'DELETE',
      headers: {
        'Content-Type': 'application/json',
      },
    });
  }

  buttonStartCreateOffer.addEventListener('click', () => {
    toggleCreateOfferModal();
  });

  buttonViewMyOffers.addEventListener('click', async () => {
    await myOffers.getOffersFromApi();
    await myOffers.render();
    toggleViewMyOffersPanel();
  });

  closeOffer.addEventListener('click', () => {
    toggleCreateOfferModal();
  });

  buyOrSellButtons.forEach((button) => {
    button.addEventListener('click', () => {
      toggleBuyOrSellButtonGroup();
    });
  });

  buttonIncreasePremium.addEventListener('click', () => {
    modifyPremiumValue(1);
  });

  buttonDecreasePremium.addEventListener('click', () => {
    modifyPremiumValue(-1);
  });

  eurAmountInput.addEventListener('blur', () => {
    validateAndFormatEurAmountInput();
    updateBtcInput();
  });

  eurAmountInput.addEventListener('input', () => {
    eurAmountInput.value = eurAmountInput.value.replace(/[^0-9]/g, '');
    updateBtcInput();
  });

  for (const btcMethodCheckbox of btcMethodCheckboxes) {
    btcMethodCheckbox.addEventListener('click', () => {
      validateBitcoinMethodCheckboxes(btcMethodCheckbox);
    });
  }

  myTrustedTrustedCheckbox.addEventListener('click', () => {
    applyTrustCheckboxConstraints(myTrustedTrustedCheckbox);
  });

  allMembersCheckbox.addEventListener('click', () => {
    applyTrustCheckboxConstraints(allMembersCheckbox);
  });

  publishOfferButton.addEventListener('click', async () => {
    await publishOffer();
    await myOffers.getOffersFromApi();
    await myOffers.render();
  });

  updateBtcInput();

  const myOffers = new MyOffers(ownOffersContainer);
}

offersPage;