(() => {
  const ADMIN_KEY_STORAGE = 'doseAdminKey';
  const PALETTE_SLOTS = 8;

  function clientTodayStr() {
    const d = new Date();
    const y = d.getFullYear();
    const m = String(d.getMonth() + 1).padStart(2, '0');
    const day = String(d.getDate()).padStart(2, '0');
    return `${y}-${m}-${day}`;
  }

  const state = {
    players: [],
    timeseries: { dates: [], series: [] },
    adminKey: localStorage.getItem(ADMIN_KEY_STORAGE) || null,
    selectedDate: clientTodayStr(),
    chart: null,
  };

  const $ = (sel) => document.querySelector(sel);
  const leaderboardBody = $('#leaderboard-body');
  const leaderboardEmpty = $('#leaderboard-empty');
  const chartEmpty = $('#chart-empty');
  const totalsRow = $('#totals-row');
  const totalsEmpty = $('#totals-empty');
  const adminStatus = $('#admin-status');
  const adminLoginBtn = $('#admin-login-btn');
  const adminLogoutBtn = $('#admin-logout-btn');
  const adminDialog = $('#admin-dialog');
  const adminLoginForm = $('#admin-login-form');
  const adminPasswordInput = $('#admin-password-input');
  const adminLoginError = $('#admin-login-error');
  const adminCancelBtn = $('#admin-cancel-btn');
  const addPlayerForm = $('#add-player-form');
  const playerNameInput = $('#player-name-input');
  const addPlayerError = $('#add-player-error');
  const doseDateInput = $('#dose-date-input');
  const adminOnlyEls = document.querySelectorAll('.admin-only');

  doseDateInput.max = clientTodayStr();
  doseDateInput.value = state.selectedDate;

  function cssVar(name) {
    return getComputedStyle(document.documentElement).getPropertyValue(name).trim();
  }

  function colorForPlayer(playerId) {
    const index = (playerId - 1) % PALETTE_SLOTS;
    return cssVar(`--series-${index + 1}`);
  }

  function dashForPlayer(playerId) {
    const cycle = Math.floor((playerId - 1) / PALETTE_SLOTS);
    return cycle === 0 ? [] : [6, 3];
  }

  function formatDateLabel(iso) {
    const [y, m, d] = iso.split('-').map(Number);
    const date = new Date(y, m - 1, d);
    return date.toLocaleDateString('fr-FR', { month: 'short', day: 'numeric' });
  }

  async function api(path, options = {}) {
    const headers = Object.assign({}, options.headers);
    if (options.body) headers['Content-Type'] = 'application/json';
    if (options.auth && state.adminKey) headers['x-admin-key'] = state.adminKey;
    const res = await fetch(`/api${path}`, { ...options, headers });
    let data = null;
    try {
      data = await res.json();
    } catch (_) {
      /* no body */
    }
    if (!res.ok) {
      const error = new Error(data?.error || `Request failed (${res.status})`);
      error.status = res.status;
      throw error;
    }
    return data;
  }

  async function loadAll() {
    const [players, timeseries] = await Promise.all([
      api(`/players?date=${state.selectedDate}`),
      api('/timeseries'),
    ]);
    state.players = players;
    state.timeseries = timeseries;
    renderLeaderboard();
    renderChart();
    renderTotals();
  }

  function setAdminMode(isAdmin) {
    adminStatus.classList.toggle('hidden', !isAdmin);
    adminLoginBtn.classList.toggle('hidden', isAdmin);
    adminLogoutBtn.classList.toggle('hidden', !isAdmin);
    adminOnlyEls.forEach((el) => el.classList.toggle('hidden', !isAdmin));
    renderLeaderboard();
  }

  function renderLeaderboard() {
    leaderboardBody.innerHTML = '';
    leaderboardEmpty.classList.toggle('hidden', state.players.length > 0);

    state.players.forEach((player, index) => {
      const tr = document.createElement('tr');

      const rankTd = document.createElement('td');
      rankTd.className = 'col-rank';
      rankTd.textContent = String(index + 1);

      const nameTd = document.createElement('td');
      nameTd.className = 'col-name';
      const nameWrap = document.createElement('span');
      nameWrap.className = 'player-name';
      const dot = document.createElement('span');
      dot.className = 'color-dot';
      dot.style.background = colorForPlayer(player.id);
      nameWrap.appendChild(dot);
      nameWrap.appendChild(document.createTextNode(player.name));
      nameTd.appendChild(nameWrap);

      const totalTd = document.createElement('td');
      totalTd.className = 'col-total';
      totalTd.textContent = String(player.total);

      tr.append(rankTd, nameTd, totalTd);

      if (state.adminKey) {
        const actionsTd = document.createElement('td');
        actionsTd.className = 'col-actions';
        const controls = document.createElement('div');
        controls.className = 'dose-controls';

        const minusBtn = document.createElement('button');
        minusBtn.className = 'btn btn-icon';
        minusBtn.textContent = '−';
        minusBtn.disabled = player.dateCount <= 0;
        minusBtn.title = 'Retirer une dose à cette date';
        minusBtn.addEventListener('click', () => undoDose(player.id));

        const dateCount = document.createElement('span');
        dateCount.className = 'today-count';
        dateCount.textContent = String(player.dateCount);

        const plusBtn = document.createElement('button');
        plusBtn.className = 'btn btn-icon';
        plusBtn.textContent = '+';
        plusBtn.title = 'Ajouter une dose à cette date';
        plusBtn.addEventListener('click', () => addDose(player.id));

        controls.append(minusBtn, dateCount, plusBtn);
        actionsTd.appendChild(controls);
        tr.appendChild(actionsTd);

        const removeTd = document.createElement('td');
        removeTd.className = 'col-remove';
        const removeBtn = document.createElement('button');
        removeBtn.className = 'btn btn-icon btn-remove';
        removeBtn.textContent = '✕';
        removeBtn.title = 'Supprimer ce joueur';
        removeBtn.addEventListener('click', () => removePlayer(player.id, player.name));
        removeTd.appendChild(removeBtn);
        tr.appendChild(removeTd);
      }

      leaderboardBody.appendChild(tr);
    });
  }

  function renderTotals() {
    totalsRow.innerHTML = '';
    totalsEmpty.classList.toggle('hidden', state.players.length > 0);

    state.players.forEach((player) => {
      const tile = document.createElement('div');
      tile.className = 'stat-tile';

      const dot = document.createElement('span');
      dot.className = 'color-dot';
      dot.style.background = colorForPlayer(player.id);

      const name = document.createElement('span');
      name.className = 'stat-name';
      name.textContent = player.name;

      const value = document.createElement('span');
      value.className = 'stat-value';
      value.textContent = String(player.total);

      tile.append(dot, name, value);
      totalsRow.appendChild(tile);
    });
  }

  function renderChart() {
    const { dates, series } = state.timeseries;
    chartEmpty.classList.toggle('hidden', dates.length > 0);
    const canvas = $('#dose-chart');
    canvas.classList.toggle('hidden', dates.length === 0);

    if (state.chart) {
      state.chart.destroy();
      state.chart = null;
    }
    if (dates.length === 0) return;

    const textMuted = cssVar('--text-muted');
    const textPrimary = cssVar('--text-primary');
    const gridline = cssVar('--gridline');
    const surface = cssVar('--surface-1');

    const datasets = series.map((s) => {
      const color = colorForPlayer(s.playerId);
      return {
        label: s.name,
        data: s.counts,
        borderColor: color,
        backgroundColor: color,
        borderWidth: 2,
        borderDash: dashForPlayer(s.playerId),
        pointRadius: 4,
        pointHoverRadius: 5,
        pointBackgroundColor: color,
        pointBorderColor: surface,
        pointBorderWidth: 2,
        tension: 0,
      };
    });

    state.chart = new Chart(canvas.getContext('2d'), {
      type: 'line',
      data: { labels: dates, datasets },
      options: {
        responsive: true,
        interaction: { mode: 'index', intersect: false },
        scales: {
          x: {
            grid: { display: false },
            border: { color: cssVar('--baseline') },
            ticks: {
              color: textMuted,
              callback: function (value) {
                const label = this.getLabelForValue(value);
                return formatDateLabel(label);
              },
            },
          },
          y: {
            beginAtZero: true,
            grid: { color: gridline },
            border: { display: false },
            ticks: { color: textMuted, precision: 0 },
          },
        },
        plugins: {
          legend: {
            display: datasets.length > 1,
            position: 'top',
            align: 'start',
            labels: {
              color: textPrimary,
              usePointStyle: true,
              pointStyle: 'circle',
              boxWidth: 8,
              boxHeight: 8,
            },
          },
          tooltip: {
            callbacks: {
              title: (items) => formatDateLabel(items[0].label),
            },
          },
        },
      },
    });
  }

  async function addDose(playerId) {
    try {
      await api('/doses', {
        method: 'POST',
        auth: true,
        body: JSON.stringify({ playerId, date: state.selectedDate }),
      });
      await loadAll();
    } catch (err) {
      handleAdminError(err);
    }
  }

  async function undoDose(playerId) {
    try {
      await api(`/doses/latest?playerId=${playerId}&date=${state.selectedDate}`, {
        method: 'DELETE',
        auth: true,
      });
      await loadAll();
    } catch (err) {
      handleAdminError(err);
    }
  }

  async function removePlayer(playerId, name) {
    if (!confirm(`Supprimer ${name} et toutes ses doses ? Cette action est irréversible.`)) return;
    try {
      await api(`/players/${playerId}`, { method: 'DELETE', auth: true });
      await loadAll();
    } catch (err) {
      handleAdminError(err);
    }
  }

  function handleAdminError(err) {
    if (err.status === 401) {
      clearAdminKey();
      alert('Votre session admin a expiré. Merci de vous reconnecter.');
    } else {
      alert(err.message);
    }
  }

  function clearAdminKey() {
    state.adminKey = null;
    localStorage.removeItem(ADMIN_KEY_STORAGE);
    setAdminMode(false);
  }

  async function tryRestoreAdminSession() {
    if (!state.adminKey) return;
    try {
      const result = await api('/admin/verify', {
        method: 'POST',
        body: JSON.stringify({ password: state.adminKey }),
      });
      if (result.ok) {
        setAdminMode(true);
      } else {
        clearAdminKey();
      }
    } catch (_) {
      clearAdminKey();
    }
  }

  addPlayerForm.addEventListener('submit', async (e) => {
    e.preventDefault();
    addPlayerError.classList.add('hidden');
    const name = playerNameInput.value.trim();
    if (!name) return;
    try {
      await api('/players', { method: 'POST', auth: true, body: JSON.stringify({ name }) });
      playerNameInput.value = '';
      await loadAll();
    } catch (err) {
      addPlayerError.textContent = err.message;
      addPlayerError.classList.remove('hidden');
    }
  });

  adminLoginBtn.addEventListener('click', () => {
    adminLoginError.classList.add('hidden');
    adminPasswordInput.value = '';
    adminDialog.showModal();
    adminPasswordInput.focus();
  });

  adminCancelBtn.addEventListener('click', () => adminDialog.close());

  adminLoginForm.addEventListener('submit', async (e) => {
    e.preventDefault();
    const password = adminPasswordInput.value;
    try {
      const result = await api('/admin/verify', {
        method: 'POST',
        body: JSON.stringify({ password }),
      });
      if (result.ok) {
        state.adminKey = password;
        localStorage.setItem(ADMIN_KEY_STORAGE, password);
        adminDialog.close();
        setAdminMode(true);
      } else {
        adminLoginError.classList.remove('hidden');
      }
    } catch (_) {
      adminLoginError.classList.remove('hidden');
    }
  });

  adminLogoutBtn.addEventListener('click', clearAdminKey);

  doseDateInput.addEventListener('change', () => {
    if (!doseDateInput.value) return;
    state.selectedDate = doseDateInput.value;
    loadAll();
  });

  (async function init() {
    await tryRestoreAdminSession();
    await loadAll();
  })();
})();