window.addEventListener('load', () => {
  fetchSettingData().then((results) => {
    let settingHash = localStorage.getItem('weighted-settings-hash');
    if (!settingHash) {
      // If no hash data has been set before, set it now
      localStorage.setItem('weighted-settings-hash', md5(results));
      localStorage.removeItem('weighted-settings');
      settingHash = md5(results);
    }

    if (settingHash !== md5(results)) {
      const userMessage = document.getElementById('user-message');
      userMessage.innerText = "Your settings are out of date! Click here to update them! Be aware this will reset " +
        "them all to default.";
      userMessage.style.display = "block";
      userMessage.addEventListener('click', resetSettings);
    }

    // Page setup
    createDefaultSettings(results);
    buildUI(results);
    updateVisibleGames();
    adjustHeaderWidth();

    // Event listeners
    document.getElementById('export-settings').addEventListener('click', () => exportSettings());
    document.getElementById('generate-race').addEventListener('click', () => generateGame(true));
    document.getElementById('generate-game').addEventListener('click', () => generateGame());

    // Name input field
    const weightedSettings = JSON.parse(localStorage.getItem('weighted-settings'));
    const nameInput = document.getElementById('player-name');
    nameInput.setAttribute('data-type', 'data');
    nameInput.setAttribute('data-setting', 'name');
    nameInput.addEventListener('keyup', updateBaseSetting);
    nameInput.value = weightedSettings.name;
  });
});

const resetSettings = () => {
  localStorage.removeItem('weighted-settings');
  localStorage.removeItem('weighted-settings-hash')
  window.location.reload();
};

const fetchSettingData = () => new Promise((resolve, reject) => {
  fetch(new Request(`${window.location.origin}/static/generated/weighted-settings.json`)).then((response) => {
    try{ resolve(response.json()); }
    catch(error){ reject(error); }
  });
});

const createDefaultSettings = (settingData) => {
  if (!localStorage.getItem('weighted-settings')) {
    const newSettings = {};

    // Transfer base options directly
    for (let baseOption of Object.keys(settingData.baseOptions)){
      newSettings[baseOption] = settingData.baseOptions[baseOption];
    }

    // Set options per game
    for (let game of Object.keys(settingData.games)) {
      // Initialize game object
      newSettings[game] = {};

      // Transfer game settings
      for (let gameSetting of Object.keys(settingData.games[game].gameSettings)){
        newSettings[game][gameSetting] = {};

        const setting = settingData.games[game].gameSettings[gameSetting];
        switch(setting.type){
          case 'select':
            setting.options.forEach((option) => {
              newSettings[game][gameSetting][option.value] =
                (setting.hasOwnProperty('defaultValue') && setting.defaultValue === option.value) ? 25 : 0;
            });
            break;
          case 'range':
            for (let i = setting.min; i <= setting.max; ++i){
              newSettings[game][gameSetting][i] =
                (setting.hasOwnProperty('defaultValue') && setting.defaultValue === i) ? 25 : 0;
            }
            newSettings[game][gameSetting]['random'] = 0;
            newSettings[game][gameSetting]['random-low'] = 0;
            newSettings[game][gameSetting]['random-high'] = 0;
            break;
          default:
            console.error(`Unknown setting type for ${game} setting ${gameSetting}: ${setting.type}`);
        }
      }

      newSettings[game].start_inventory = [];
      newSettings[game].exclude_locations = [];
      newSettings[game].local_items = [];
      newSettings[game].non_local_items = [];
      newSettings[game].start_hints = [];
    }

    localStorage.setItem('weighted-settings', JSON.stringify(newSettings));
  }
};

// TODO: Include item configs: start_inventory, local_items, non_local_items, start_hints
// TODO: Include location configs: exclude_locations
const buildUI = (settingData) => {
  // Build the game-choice div
  buildGameChoice(settingData.games);

  const gamesWrapper = document.getElementById('games-wrapper');
  Object.keys(settingData.games).forEach((game) => {
    // Create game div, invisible by default
    const gameDiv = document.createElement('div');
    gameDiv.setAttribute('id', `${game}-div`);
    gameDiv.classList.add('game-div');
    gameDiv.classList.add('invisible');

    const gameHeader = document.createElement('h2');
    gameHeader.innerText = game;
    gameDiv.appendChild(gameHeader);

    const collapseButton = document.createElement('a');
    collapseButton.innerText = '(Collapse)';
    gameDiv.appendChild(collapseButton);

    const expandButton = document.createElement('a');
    expandButton.innerText = '(Expand)';
    expandButton.classList.add('invisible');
    gameDiv.appendChild(expandButton);

    const optionsDiv = buildOptionsDiv(game, settingData.games[game].gameSettings);
    gameDiv.appendChild(optionsDiv);
    gamesWrapper.appendChild(gameDiv);

    collapseButton.addEventListener('click', () => {
      collapseButton.classList.add('invisible');
      optionsDiv.classList.add('invisible');
      expandButton.classList.remove('invisible');
    });

    expandButton.addEventListener('click', () => {
      collapseButton.classList.remove('invisible');
      optionsDiv.classList.remove('invisible');
      expandButton.classList.add('invisible');
    });
  });
};

const buildGameChoice = (games) => {
  const settings = JSON.parse(localStorage.getItem('weighted-settings'));
  const gameChoiceDiv = document.getElementById('game-choice');
  const h2 = document.createElement('h2');
  h2.innerText = 'Game Select';
  gameChoiceDiv.appendChild(h2);

  const gameSelectDescription = document.createElement('p');
  gameSelectDescription.classList.add('setting-description');
  gameSelectDescription.innerText = 'Choose which games you might be required to play.';
  gameChoiceDiv.appendChild(gameSelectDescription);

  const hintText = document.createElement('p');
  hintText.classList.add('hint-text');
  hintText.innerText = 'If a game\'s value is greater than zero, you can click it\'s name to jump ' +
    'to that section.'
  gameChoiceDiv.appendChild(hintText);

  // Build the game choice table
  const table = document.createElement('table');
  const tbody = document.createElement('tbody');

  Object.keys(games).forEach((game) => {
    const tr = document.createElement('tr');
    const tdLeft = document.createElement('td');
    tdLeft.classList.add('td-left');
    const span = document.createElement('span');
    span.innerText = game;
    span.setAttribute('id', `${game}-game-option`)
    tdLeft.appendChild(span);
    tr.appendChild(tdLeft);

    const tdMiddle = document.createElement('td');
    tdMiddle.classList.add('td-middle');
    const range = document.createElement('input');
    range.setAttribute('type', 'range');
    range.setAttribute('min', 0);
    range.setAttribute('max', 50);
    range.setAttribute('data-type', 'weight');
    range.setAttribute('data-setting', 'game');
    range.setAttribute('data-option', game);
    range.value = settings.game[game];
    range.addEventListener('change', (evt) => {
      updateBaseSetting(evt);
      updateVisibleGames(); // Show or hide games based on the new settings
    });
    tdMiddle.appendChild(range);
    tr.appendChild(tdMiddle);

    const tdRight = document.createElement('td');
    tdRight.setAttribute('id', `game-${game}`)
    tdRight.classList.add('td-right');
    tdRight.innerText = range.value;
    tr.appendChild(tdRight);
    tbody.appendChild(tr);
  });

  table.appendChild(tbody);
  gameChoiceDiv.appendChild(table);
};

const buildOptionsDiv = (game, settings) => {
  const currentSettings = JSON.parse(localStorage.getItem('weighted-settings'));
  const optionsWrapper = document.createElement('div');
  optionsWrapper.classList.add('settings-wrapper');

  Object.keys(settings).forEach((settingName) => {
    const setting = settings[settingName];
    const settingWrapper = document.createElement('div');
    settingWrapper.classList.add('setting-wrapper');

    const settingNameHeader = document.createElement('h4');
    settingNameHeader.innerText = setting.displayName;
    settingWrapper.appendChild(settingNameHeader);

    const settingDescription = document.createElement('p');
    settingDescription.classList.add('setting-description');
    settingDescription.innerText = setting.description.replace(/(\n)/g, ' ');
    settingWrapper.appendChild(settingDescription);

    switch(setting.type){
      case 'select':
        const optionTable = document.createElement('table');
        const tbody = document.createElement('tbody');

        // Add a weight range for each option
        setting.options.forEach((option) => {
          const tr = document.createElement('tr');
          const tdLeft = document.createElement('td');
          tdLeft.classList.add('td-left');
          tdLeft.innerText = option.name;
          tr.appendChild(tdLeft);

          const tdMiddle = document.createElement('td');
          tdMiddle.classList.add('td-middle');
          const range = document.createElement('input');
          range.setAttribute('type', 'range');
          range.setAttribute('data-game', game);
          range.setAttribute('data-setting', settingName);
          range.setAttribute('data-option', option.value);
          range.setAttribute('data-type', setting.type);
          range.setAttribute('min', 0);
          range.setAttribute('max', 50);
          range.addEventListener('change', updateGameSetting);
          range.value = currentSettings[game][settingName][option.value];
          tdMiddle.appendChild(range);
          tr.appendChild(tdMiddle);

          const tdRight = document.createElement('td');
          tdRight.setAttribute('id', `${game}-${settingName}-${option.value}`)
          tdRight.classList.add('td-right');
          tdRight.innerText = range.value;
          tr.appendChild(tdRight);

          tbody.appendChild(tr);
        });

        optionTable.appendChild(tbody);
        settingWrapper.appendChild(optionTable);
        break;

      case 'range':
        const hintText = document.createElement('p');
        hintText.classList.add('hint-text');
        hintText.innerHTML = 'This is a range option. You may enter valid numerical values in the text box below, ' +
          `then press the "Add" button to add a weight for it.<br />Minimum value: ${setting.min}<br />` +
          `Maximum value: ${setting.max}`;
        settingWrapper.appendChild(hintText);

        const addOptionDiv = document.createElement('div');
        addOptionDiv.classList.add('add-option-div');
        const optionInput = document.createElement('input');
        optionInput.setAttribute('id', `${game}-${settingName}-option`);
        optionInput.setAttribute('placeholder', `${setting.min} - ${setting.max}`);
        addOptionDiv.appendChild(optionInput);
        const addOptionButton = document.createElement('button');
        addOptionButton.innerText = 'Add';
        addOptionDiv.appendChild(addOptionButton);
        settingWrapper.appendChild(addOptionDiv);
        optionInput.addEventListener('keydown', (evt) => {
          if (evt.key === 'Enter') { addOptionButton.dispatchEvent(new Event('click')); }
        });

        const rangeTable = document.createElement('table');
        const rangeTbody = document.createElement('tbody');

        if (((setting.max - setting.min) + 1) < 11) {
          for (let i=setting.min; i <= setting.max; ++i) {
            const tr = document.createElement('tr');
              const tdLeft = document.createElement('td');
              tdLeft.classList.add('td-left');
              tdLeft.innerText = i;
              tr.appendChild(tdLeft);

              const tdMiddle = document.createElement('td');
              tdMiddle.classList.add('td-middle');
              const range = document.createElement('input');
              range.setAttribute('type', 'range');
              range.setAttribute('id', `${game}-${settingName}-${i}-range`);
              range.setAttribute('data-game', game);
              range.setAttribute('data-setting', settingName);
              range.setAttribute('data-option', i);
              range.setAttribute('min', 0);
              range.setAttribute('max', 50);
              range.addEventListener('change', updateGameSetting);
              range.value = currentSettings[game][settingName][i];
              tdMiddle.appendChild(range);
              tr.appendChild(tdMiddle);

              const tdRight = document.createElement('td');
              tdRight.setAttribute('id', `${game}-${settingName}-${i}`)
              tdRight.classList.add('td-right');
              tdRight.innerText = range.value;
              tr.appendChild(tdRight);

              rangeTbody.appendChild(tr);
          }
        } else {
          Object.keys(currentSettings[game][settingName]).forEach((option) => {
            if (currentSettings[game][settingName][option] > 0) {
              const tr = document.createElement('tr');
              const tdLeft = document.createElement('td');
              tdLeft.classList.add('td-left');
              tdLeft.innerText = option;
              tr.appendChild(tdLeft);

              const tdMiddle = document.createElement('td');
              tdMiddle.classList.add('td-middle');
              const range = document.createElement('input');
              range.setAttribute('type', 'range');
              range.setAttribute('id', `${game}-${settingName}-${option}-range`);
              range.setAttribute('data-game', game);
              range.setAttribute('data-setting', settingName);
              range.setAttribute('data-option', option);
              range.setAttribute('min', 0);
              range.setAttribute('max', 50);
              range.addEventListener('change', updateGameSetting);
              range.value = currentSettings[game][settingName][parseInt(option, 10)];
              tdMiddle.appendChild(range);
              tr.appendChild(tdMiddle);

              const tdRight = document.createElement('td');
              tdRight.setAttribute('id', `${game}-${settingName}-${option}`)
              tdRight.classList.add('td-right');
              tdRight.innerText = range.value;
              tr.appendChild(tdRight);

              const tdDelete = document.createElement('td');
              tdDelete.classList.add('td-delete');
              const deleteButton = document.createElement('span');
              deleteButton.classList.add('range-option-delete');
              deleteButton.innerText = '❌';
              deleteButton.addEventListener('click', () => {
                range.value = 0;
                range.dispatchEvent(new Event('change'));
                rangeTbody.removeChild(tr);
              });
              tdDelete.appendChild(deleteButton);
              tr.appendChild(tdDelete);

              rangeTbody.appendChild(tr);
            }
          });
        }

        ['random', 'random-low', 'random-high'].forEach((option) => {
          const tr = document.createElement('tr');
            const tdLeft = document.createElement('td');
            tdLeft.classList.add('td-left');
            tdLeft.innerText = option;
            tr.appendChild(tdLeft);

            const tdMiddle = document.createElement('td');
            tdMiddle.classList.add('td-middle');
            const range = document.createElement('input');
            range.setAttribute('type', 'range');
            range.setAttribute('id', `${game}-${settingName}-${option}-range`);
            range.setAttribute('data-game', game);
            range.setAttribute('data-setting', settingName);
            range.setAttribute('data-option', option);
            range.setAttribute('min', 0);
            range.setAttribute('max', 50);
            range.addEventListener('change', updateGameSetting);
            range.value = currentSettings[game][settingName][option];
            tdMiddle.appendChild(range);
            tr.appendChild(tdMiddle);

            const tdRight = document.createElement('td');
            tdRight.setAttribute('id', `${game}-${settingName}-${option}`)
            tdRight.classList.add('td-right');
            tdRight.innerText = range.value;
            tr.appendChild(tdRight);
            rangeTbody.appendChild(tr);
        });

        rangeTable.appendChild(rangeTbody);
        settingWrapper.appendChild(rangeTable);

        addOptionButton.addEventListener('click', () => {
          const optionInput = document.getElementById(`${game}-${settingName}-option`);
          let option = optionInput.value;
          if (!option || !option.trim()) { return; }
          option = parseInt(option, 10);
          if ((option < setting.min) || (option > setting.max)) { return; }
          optionInput.value = '';
          if (document.getElementById(`${game}-${settingName}-${option}-range`)) { return; }

          const tr = document.createElement('tr');
          const tdLeft = document.createElement('td');
          tdLeft.classList.add('td-left');
          tdLeft.innerText = option;
          tr.appendChild(tdLeft);

          const tdMiddle = document.createElement('td');
          tdMiddle.classList.add('td-middle');
          const range = document.createElement('input');
          range.setAttribute('type', 'range');
          range.setAttribute('id', `${game}-${settingName}-${option}-range`);
          range.setAttribute('data-game', game);
          range.setAttribute('data-setting', settingName);
          range.setAttribute('data-option', option);
          range.setAttribute('min', 0);
          range.setAttribute('max', 50);
          range.addEventListener('change', updateGameSetting);
          range.value = currentSettings[game][settingName][parseInt(option, 10)];
          tdMiddle.appendChild(range);
          tr.appendChild(tdMiddle);

          const tdRight = document.createElement('td');
          tdRight.setAttribute('id', `${game}-${settingName}-${option}`)
          tdRight.classList.add('td-right');
          tdRight.innerText = range.value;
          tr.appendChild(tdRight);

          const tdDelete = document.createElement('td');
          tdDelete.classList.add('td-delete');
          const deleteButton = document.createElement('span');
          deleteButton.classList.add('range-option-delete');
          deleteButton.innerText = '❌';
          deleteButton.addEventListener('click', () => {
            range.value = 0;
            range.dispatchEvent(new Event('change'));
            rangeTbody.removeChild(tr);
          });
          tdDelete.appendChild(deleteButton);
          tr.appendChild(tdDelete);

          rangeTbody.appendChild(tr);
        });
        break;

      default:
        console.error(`Unknown setting type for ${game} setting ${setting}: ${settings[setting].type}`);
        return;
    }

    optionsWrapper.appendChild(settingWrapper);
  });

  return optionsWrapper;
};

const updateVisibleGames = () => {
  const settings = JSON.parse(localStorage.getItem('weighted-settings'));
  Object.keys(settings.game).forEach((game) => {
    const gameDiv = document.getElementById(`${game}-div`);
    const gameOption = document.getElementById(`${game}-game-option`);
    if (parseInt(settings.game[game], 10) > 0) {
      gameDiv.classList.remove('invisible');
      gameOption.classList.add('jump-link');
      gameOption.addEventListener('click', () => {
        const gameDiv = document.getElementById(`${game}-div`);
        if (gameDiv.classList.contains('invisible')) { return; }
        gameDiv.scrollIntoView({
          behavior: 'smooth',
          block: 'start',
        });
      });
    } else {
      gameDiv.classList.add('invisible');
      gameOption.classList.remove('jump-link');

    }
  });
};

const updateBaseSetting = (event) => {
  const settings = JSON.parse(localStorage.getItem('weighted-settings'));
  const setting = event.target.getAttribute('data-setting');
  const option = event.target.getAttribute('data-option');
  const type = event.target.getAttribute('data-type');

  switch(type){
    case 'weight':
      settings[setting][option] = isNaN(event.target.value) ? event.target.value : parseInt(event.target.value, 10);
      document.getElementById(`${setting}-${option}`).innerText = event.target.value;
      break;
    case 'data':
      settings[setting] = isNaN(event.target.value) ? event.target.value : parseInt(event.target.value, 10);
      break;
  }

  localStorage.setItem('weighted-settings', JSON.stringify(settings));
};

const updateGameSetting = (event) => {
  const options = JSON.parse(localStorage.getItem('weighted-settings'));
  const game = event.target.getAttribute('data-game');
  const setting = event.target.getAttribute('data-setting');
  const option = event.target.getAttribute('data-option');
  const type = event.target.getAttribute('data-type');
  document.getElementById(`${game}-${setting}-${option}`).innerText = event.target.value;
  options[game][setting][option] = isNaN(event.target.value) ?
      event.target.value : parseInt(event.target.value, 10);
  localStorage.setItem('weighted-settings', JSON.stringify(options));
};

const exportSettings = () => {
  const settings = JSON.parse(localStorage.getItem('weighted-settings'));
  if (!settings.name || settings.name.trim().length === 0 || settings.name.toLowerCase().trim() === 'player') {
    const userMessage = document.getElementById('user-message');
    userMessage.innerText = 'You forgot to set your player name at the top of the page!';
    userMessage.classList.add('visible');
    window.scrollTo(0, 0);
    return;
  }

  // Clean up the settings output
  Object.keys(settings.game).forEach((game) => {
    // Remove any disabled games
    if (settings.game[game] === 0) {
      delete settings.game[game];
      delete settings[game];
      return;
    }

    // Remove any disabled options
    Object.keys(settings[game]).forEach((setting) => {
      Object.keys(settings[game][setting]).forEach((option) => {
        if (settings[game][setting][option] === 0) {
          delete settings[game][setting][option];
        }
      });
    });
  });

  const yamlText = jsyaml.safeDump(settings, { noCompatMode: true }).replaceAll(/'(\d+)':/g, (x, y) => `${y}:`);
  download(`${document.getElementById('player-name').value}.yaml`, yamlText);
};

/** Create an anchor and trigger a download of a text file. */
const download = (filename, text) => {
  const downloadLink = document.createElement('a');
  downloadLink.setAttribute('href','data:text/yaml;charset=utf-8,'+ encodeURIComponent(text))
  downloadLink.setAttribute('download', filename);
  downloadLink.style.display = 'none';
  document.body.appendChild(downloadLink);
  downloadLink.click();
  document.body.removeChild(downloadLink);
};

const generateGame = (raceMode = false) => {
  axios.post('/api/generate', {
    weights: { player: localStorage.getItem('weighted-settings') },
    presetData: { player: localStorage.getItem('weighted-settings') },
    playerCount: 1,
    race: raceMode ? '1' : '0',
  }).then((response) => {
    window.location.href = response.data.url;
  }).catch((error) => {
    const userMessage = document.getElementById('user-message');
    userMessage.innerText = 'Something went wrong and your game could not be generated.';
    if (error.response.data.text) {
      userMessage.innerText += ' ' + error.response.data.text;
    }
    userMessage.classList.add('visible');
    window.scrollTo(0, 0);
    console.error(error);
  });
};