// Fantabeto PWA — Auction Assistant
const API = "/api";
const state = {
  tab: "auction",
  players: [],
  roster: [],
  budgetSpent: 0,
  budgetTotal: 500,
  selectedPlayer: null,
  search: "",
  roleFilter: "",
  bidAmount: 0,
  online: true,
};

// ── Init ────────────────────────────────────────────────────────
async function init() {
  registerSW();
  await loadRoster();
  await searchPlayers();
  await checkHealth();
  setInterval(checkHealth, 30000);
}

function registerSW() {
  if ("serviceWorker" in navigator) {
    navigator.serviceWorker.register("/sw.js");
  }
}

async function api(url, opts = {}) {
  try {
    const res = await fetch(url, opts);
    state.online = true;
    updatePing();
    return await res.json();
  } catch (e) {
    state.online = false;
    updatePing();
    return null;
  }
}

async function checkHealth() {
  const r = await api(API + "/stats");
  document.getElementById("ping").className = state.online ? "ping" : "ping offline";
  document.getElementById("ping").textContent = state.online ? "● connected" : "○ offline";
}

function updatePing() {
  const el = document.getElementById("ping");
  if (!el) return;
  el.className = state.online ? "ping" : "ping offline";
  el.textContent = state.online ? "● connected" : "○ offline";
}

// ── Search ──────────────────────────────────────────────────────
async function searchPlayers() {
  const params = new URLSearchParams({ limit: 60, sort: "projected_points" });
  if (state.search) params.set("search", state.search);
  if (state.roleFilter) params.set("role", state.roleFilter);

  const data = await api(API + "/players?" + params);
  state.players = data?.players || [];
  renderPlayerList();
}

// ── Roster ──────────────────────────────────────────────────────
async function loadRoster() {
  const data = await api(API + "/roster");
  if (data) {
    state.roster = data.roster || [];
    state.budgetSpent = data.budget_spent || 0;
  }
  renderBudget();
  renderRoster();
}

async function addToRoster(name, price) {
  const data = await api(API + "/roster/add", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ name, price }),
  });
  if (data?.error) {
    toast(data.error, "error");
    return false;
  }
  if (data?.ok) {
    state.roster = data.roster.roster;
    state.budgetSpent = data.roster.budget_spent;
    renderBudget();
    renderRoster();
    renderPlayerList();
    toast(`${name} added · ${price} cr`);
    return true;
  }
  return false;
}

async function removeFromRoster(name) {
  const data = await api(API + "/roster/remove", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ name }),
  });
  if (data?.ok) {
    state.roster = data.roster.roster;
    state.budgetSpent = data.roster.budget_spent;
    renderBudget();
    renderRoster();
    renderPlayerList();
    toast(`Removed ${name}`);
  }
}

async function resetRoster() {
  if (!confirm("Reset entire roster?")) return;
  await api(API + "/roster/reset", { method: "POST" });
  state.roster = [];
  state.budgetSpent = 0;
  renderBudget();
  renderRoster();
  renderPlayerList();
}

// ── Player detail ───────────────────────────────────────────────
async function showPlayer(name) {
  const data = await api(API + "/player/" + encodeURIComponent(name));
  if (!data) return;
  state.selectedPlayer = data;
  state.bidAmount = data.recommended_bid || 0;
  renderDetail();
}

function closeDetail() {
  state.selectedPlayer = null;
  renderDetail();
}

function setBid(amount) {
  state.bidAmount = amount;
  document.getElementById("bidInput").value = amount;
  document.querySelectorAll(".bid-quick button").forEach((b) => {
    const v = parseInt(b.dataset.bid);
    b.className = v === amount ? "active" : "";
  });
}

function formatBidButtons(player) {
  const bids = [];
  const rec = player.recommended_bid || 0;
  const max = player.max_bid || 0;
  const mkt = player.market_value || 0;
  if (mkt > 0) bids.push(mkt);
  if (rec > 0 && rec !== mkt) bids.push(rec);
  if (max > 0 && max !== rec && max !== mkt) bids.push(max);
  // Ensure at least 3 options
  if (bids.length < 3 && mkt > 10) bids.push(Math.round(mkt * 1.3));
  return [...new Set(bids)].sort((a, b) => a - b);
}

// ── Render ──────────────────────────────────────────────────────
function renderBudget() {
  const spent = state.budgetSpent;
  const total = state.budgetTotal;
  const pct = Math.min((spent / total) * 100, 100);

  document.getElementById("budgetSpent").textContent = spent;
  document.getElementById("budgetRemaining").textContent = total - spent;
  document.getElementById("budgetFill").style.width = pct + "%";
  document.getElementById("budgetFill").style.background =
    pct > 90 ? "var(--red)" : pct > 70 ? "var(--gold)" : "var(--green)";
}

function renderPlayerList() {
  const el = document.getElementById("playerList");
  const inRoster = new Set(state.roster.map((p) => p.name));

  if (!state.players.length) {
    el.innerHTML = '<div class="empty">No players found</div>';
    return;
  }

  el.innerHTML = state.players
    .map((p) => {
      const added = inRoster.has(p.name);
      return `
      <div class="player-card ${added ? "selected" : ""}" onclick="showPlayer('${p.name}')">
        <div class="role-badge ${p.role}">${p.role}</div>
        <div class="player-info">
          <div class="player-name">${p.name}</div>
          <div class="player-team">${p.team || ""}</div>
          <div class="player-stats">
            <span>FV <strong>${p.projected_points?.toFixed(1) || "—"}</strong></span>
            <span>Start <strong>${Math.round((p.starter_pct || 0) * 100)}%</strong></span>
            <span>Games <strong>${p.games_played || "—"}</strong></span>
          </div>
        </div>
        <div class="player-price">
          <div class="amt">${p.market_value} cr</div>
          <div class="label">${added ? "OWNED" : "market"}</div>
        </div>
      </div>`;
    })
    .join("");
}

function renderRoster() {
  const el = document.getElementById("rosterList");
  if (!state.roster.length) {
    el.innerHTML = '<div class="empty">No players drafted yet. Search and add players.</div>';
    return;
  }

  const roleOrder = { P: "🧤 Goalkeepers", D: "🛡 Defenders", C: "⚙ Midfielders", A: "⚡ Forwards" };
  let html = "";

  for (const [role, label] of Object.entries(roleOrder)) {
    const players = state.roster.filter((p) => p.role === role);
    if (!players.length) continue;
    html += `<div class="roster-section"><h3>${label} (${players.length})</h3>`;
    html += players
      .map(
        (p) => `
      <div class="roster-player">
        <div class="role-badge ${p.role}" style="width:24px;height:24px;font-size:10px;">${p.role}</div>
        <div class="name">${p.name}</div>
        <div class="name" style="font-size:11px;color:var(--muted);">${p.team}</div>
        <div class="price">${p.price} cr</div>
        <button class="remove" onclick="removeFromRoster('${p.name}')">✕</button>
      </div>`
      )
      .join("");
    html += "</div>";
  }
  el.innerHTML = html;
}

function renderDetail() {
  const el = document.getElementById("detailOverlay");
  if (!state.selectedPlayer) {
    el.style.display = "none";
    return;
  }

  const p = state.selectedPlayer;
  const bidButtons = formatBidButtons(p);
  const remaining = state.budgetTotal - state.budgetSpent;

  el.style.display = "flex";
  el.innerHTML = `
    <div class="detail-sheet" onclick="event.stopPropagation()">
      <div class="detail-header">
        <div>
          <div style="display:flex;align-items:center;gap:8px;">
            <div class="role-badge ${p.role}">${p.role}</div>
            <div>
              <div style="font-weight:700;font-size:18px;">${p.name}</div>
              <div style="font-size:12px;color:var(--muted);">${p.team}</div>
            </div>
          </div>
        </div>
        <button class="detail-close" onclick="closeDetail()">✕</button>
      </div>

      <div class="ml-card">
        <div class="title">Projected Fantavoto</div>
        <div class="row"><span>Median (P50)</span><span class="val" style="color:var(--sky);">${p.p50}</span></div>
        <div class="row"><span>Floor (P10)</span><span class="val" style="color:var(--red);">${p.p10}</span></div>
        <div class="row"><span>Ceiling (P90)</span><span class="val" style="color:var(--green);">${p.p90}</span></div>
      </div>

      <div class="ml-card">
        <div class="title">Risk Assessment</div>
        <div class="row"><span>Downside Risk P(FV &lt; 5.5)</span><span class="val" style="color:${p.downside_risk > 0.2 ? 'var(--red)' : 'var(--green)'};">${(p.downside_risk * 100).toFixed(0)}%</span></div>
        <div class="row"><span>Starter Probability</span><span class="val">${(p.starter_prob * 100).toFixed(0)}%</span></div>
        <div class="row"><span>Games Played</span><span class="val">${p.games_played}</span></div>
      </div>

      <div class="ml-card" style="border-color:var(--gold);">
        <div class="title" style="color:var(--gold);">Auction Intelligence</div>
        <div class="row"><span>Market Value</span><span class="val" style="color:var(--gold);">${p.market_value} cr</span></div>
        <div class="row"><span>ML Recommended Bid</span><span class="val" style="color:var(--green);">${p.recommended_bid} cr</span></div>
        <div class="row"><span>Estimated Opponent Bid</span><span class="val" style="color:var(--red);">${p.opponent_bid} cr</span></div>
        <div class="row"><span>Max Rational Bid</span><span class="val">${p.max_bid} cr</span></div>
        <div class="row" style="margin-top:4px;font-size:11px;color:var(--muted);">
          <span>Value: ${p.p50 / Math.max(p.recommended_bid || 1, 1).toFixed(3)} FV/cr</span>
          <span>Budget left: ${remaining} cr</span>
        </div>
      </div>

      <div class="bid-quick">
        ${bidButtons.map((b) => {
          const over = b > remaining;
          return `<button data-bid="${b}" class="${b === state.bidAmount ? 'active' : ''} ${over ? 'over' : ''}"
                         onclick="setBid(${b})">${b} cr</button>`;
        }).join("")}
      </div>

      <div class="bid-row">
        <input id="bidInput" type="number" value="${state.bidAmount}" min="1" max="${remaining}"
               onchange="state.bidAmount=parseInt(this.value)||0">
        <button onclick="doBid('${p.name}')" ${state.bidAmount > remaining ? "disabled" : ""}>
          BUY
        </button>
      </div>

      ${state.roster.some((r) => r.name === p.name)
        ? `<div class="bid-row"><button class="danger" onclick="removeFromRoster('${p.name}');closeDetail();">REMOVE FROM ROSTER</button></div>`
        : ""}
    </div>
  `;

  // Focus bid input
  setTimeout(() => {
    const inp = document.getElementById("bidInput");
    if (inp) { inp.focus(); inp.select(); }
  }, 100);
}

// ── Actions ─────────────────────────────────────────────────────
async function doBid(name) {
  const success = await addToRoster(name, state.bidAmount);
  if (success) {
    state.bidAmount = 0;
    closeDetail();
  }
}

function toast(msg, type = "") {
  const el = document.createElement("div");
  el.className = "toast" + (type === "error" ? " error" : "");
  el.textContent = msg;
  document.body.appendChild(el);
  setTimeout(() => el.remove(), 2000);
}

// ── Tab switching ───────────────────────────────────────────────
function switchTab(tab) {
  state.tab = tab;
  document.querySelectorAll(".tab").forEach((t) => t.classList.toggle("active", t.dataset.tab === tab));
  document.getElementById("auctionView").style.display = tab === "auction" ? "block" : "none";
  document.getElementById("rosterView").style.display = tab === "roster" ? "block" : "none";
  document.getElementById("statsView").style.display = tab === "stats" ? "block" : "none";
  if (tab === "stats") loadStats();
  if (tab === "roster") loadRoster();
}

async function loadStats() {
  const data = await api(API + "/stats");
  if (!data) return;
  document.getElementById("statsView").innerHTML = `
    <div class="stat-grid">
      <div class="stat-card"><div class="num" style="color:var(--sky);">${data.total_players}</div><div class="lbl">Players</div></div>
      <div class="stat-card"><div class="num" style="color:var(--gold);">${data.elite_count}</div><div class="lbl">Elite (&gt;100cr)</div></div>
      <div class="stat-card"><div class="num" style="color:var(--green);">${data.median_price}</div><div class="lbl">Median Price (cr)</div></div>
      <div class="stat-card"><div class="num">${data.price_range[0]}–${data.price_range[1]}</div><div class="lbl">Price Range (cr)</div></div>
    </div>
    <div class="stat-grid" style="margin-top:8px;">
      ${Object.entries(data.role_counts).map(([r, c]) => `
        <div class="stat-card"><div class="num" style="color:var(--${r === 'P' ? 'gk' : r === 'D' ? 'def' : r === 'C' ? 'mid' : 'fwd'});">${c}</div><div class="lbl">${r === 'P' ? 'Goalkeepers' : r === 'D' ? 'Defenders' : r === 'C' ? 'Midfielders' : 'Forwards'}</div></div>
      `).join("")}
    </div>
  `;
}

// ── Event bindings ──────────────────────────────────────────────
document.addEventListener("DOMContentLoaded", init);