import { showNotification } from "../notification.js";
import { refreshHud } from "../hud.js";

/* ── Einstiegspunkt ─────────────────────────────── */
export async function loadMine(buildingId) {
  const actionsTab = document.getElementById("tab-actions");
  if (!actionsTab) return;
  actionsTab.innerHTML = `<div class="mine-loading">Lade Mineninfo...</div>`;
  await renderMineStatus(buildingId);
}

/* ─────────────────────────────────────────────────
   Haupt-Render-Funktion
───────────────────────────────────────────────── */
async function renderMineStatus(buildingId) {
  const actionsTab = document.getElementById("tab-actions");
  try {
    const res = await fetch("/api/mine/" + buildingId + "/status");
    if (!res.ok) throw new Error("API Fehler");
    const data = await res.json();

    if (data.error) {
      actionsTab.innerHTML = "<p class='mine-error'>" + data.error + "</p>";
      return;
    }

    actionsTab.innerHTML =
      "<div class='mine-panel'>" +
      renderHeader(data) +
      renderDivider() +

      // Ressource wählen (nur wenn noch keine aktive Session)
      (!data.selected_resource
        ? renderResourceSelector(data, buildingId)
        : renderActiveSession(data, buildingId)
      ) +

      "</div>";

    if (data.selected_resource) {
      startCountdown(buildingId, data);
    }
  } catch (err) {
    console.error("Mine Fehler:", err);
    actionsTab.innerHTML =
      "<p class='mine-error'>Fehler beim Laden der Mineninfo.</p>";
  }
}

/* ─────────────────────────────────────────────────
   Header
───────────────────────────────────────────────── */
function renderHeader(data) {
  let cycleText = "Keine Ressource gewählt";
  if (data.selected_resource) {
    if (data.is_full)         cycleText = "Voll – bitte abholen!";
    else if (data.cycles > 0) cycleText = data.cycles + "x Zyklus abgeschlossen";
    else                      cycleText = "Läuft...";
  }
  return (
    "<div class='mine-header-row'>" +
    "<span class='mine-level-badge'>Level " + data.level + "</span>" +
    "<span class='mine-cycles'>" + cycleText + "</span>" +
    "</div>"
  );
}

/* ─────────────────────────────────────────────────
   Ressourcen-Auswahl (Startscreen ohne aktive Session)
───────────────────────────────────────────────── */
function renderResourceSelector(data, buildingId) {
  return (
    "<p class='mine-section-title'>Ressource wählen</p>" +
    "<p class='mine-hint'>Wähle eine Ressource für die nächsten " + data.session_hours + "h.</p>" +
    renderResourceGrid(data.production, null, buildingId, "select")
  );
}

/* ─────────────────────────────────────────────────
   Aktive Session (mit Timer, Queue, Collect-Button)
───────────────────────────────────────────────── */
function renderActiveSession(data, buildingId) {
  return (
    // Aktuelle Produktion
    renderCurrentProduction(data) +
    renderDivider() +

    // Warteschlangen-Bereich
    renderQueueSection(data, buildingId) +
    renderDivider() +

    // Abholen-Button
    renderCollectSection(data, buildingId)
  );
}

/* ─────────────────────────────────────────────────
   Aktuelle Produktion
───────────────────────────────────────────────── */
function renderCurrentProduction(data) {
  const minutesLeft  = Math.floor(data.next_cycle_in_seconds / 60);
  const secondsLeft  = data.next_cycle_in_seconds % 60;
  const progressPct  = Math.min(100, Math.round((data.cycles / data.max_cycles) * 100));

  return (
    "<p class='mine-section-title'>Aktuelle Session – " + data.session_hours + "h</p>" +
    "<div class='mine-resource-row" + (data.ready ? " mine-resource-ready" : "") + "'>" +
    "<span class='mine-resource-icon'>" + resourceIcon(data.selected_resource) + "</span>" +
    "<span class='mine-resource-label'>" + resourceLabel(data.selected_resource) + "</span>" +
    "<span class='mine-resource-amount'>" + data.available_amount + "</span>" +
    "</div>" +
    "<div class='mine-progress-wrap'>" +
    "<div class='mine-progress-bar' style='width:" + progressPct + "%'></div>" +
    "</div>" +
    "<div class='mine-timer-row'>" +
    "<span class='mine-timer-label'>" +
    (data.is_full ? "Zeit abgelaufen!" : "Nächster Zyklus in") +
    "</span>" +
    (data.is_full
      ? "<span class='mine-timer mine-timer-full'>VOLL</span>"
      : "<span class='mine-timer' id='mine-countdown' data-seconds='" +
        data.next_cycle_in_seconds + "'>" +
        minutesLeft + "m " + secondsLeft + "s</span>"
    ) +
    "</div>"
  );
}

/* ─────────────────────────────────────────────────
   Warteschlangen-Bereich
   – zeigt belegte Slots als Ressourcen-Badges
   – zeigt freie Slots als aufklappbare Auswahl
───────────────────────────────────────────────── */
function renderQueueSection(data, buildingId) {
  const { loop_queue, loop_slots_free, loop_slots_used,
          loop_cost_gems, can_afford_loop, player_gems } = data;

  let html =
    "<p class='mine-section-title'>Warteschlange" +
    " <span class='mine-queue-count'>(" + loop_slots_used + "/4)</span></p>";

  // Belegte Slots
  loop_queue.forEach((res, i) => {
    html +=
      "<div class='mine-queue-slot mine-queue-slot-filled'>" +
      "<span class='mine-queue-pos'>" + (i + 1) + ".</span>" +
      "<span class='mine-queue-icon'>" + resourceIcon(res) + "</span>" +
      "<span class='mine-queue-label'>" + resourceLabel(res) + "</span>" +
      "<span class='mine-queue-dur'>" + data.session_hours + "h</span>" +
      "</div>";
  });

  // Freie Slots (kaufbar)
  if (loop_slots_free > 0) {
    const nextPos = loop_slots_used + 1;
    html +=
      "<div class='mine-queue-add' id='mine-queue-add'>" +
      "<button class='mine-btn-add-loop" + (can_afford_loop ? "" : " mine-btn-disabled") + "'" +
      " id='mine-queue-toggle'" +
      " data-building='" + buildingId + "'" +
      (can_afford_loop ? "" : " disabled") + ">" +
      "<span class='mine-loop-gem-icon'>💎</span>" +
      (can_afford_loop
        ? "Schleife " + nextPos + " hinzufügen (" + loop_cost_gems + " Juwelen)"
        : "Schleife " + nextPos + " (" + loop_cost_gems + " 💎 – nur " + player_gems + " verfügbar)"
      ) +
      "</button>" +
      // Resource-Picker (standardmäßig versteckt)
      "<div class='mine-loop-picker' id='mine-loop-picker' style='display:none'>" +
      "<p class='mine-hint'>Welche Ressource soll in Slot " + nextPos + " abgebaut werden?</p>" +
      renderResourceGrid(data.production, null, buildingId, "loop") +
      "</div>" +
      "</div>";
  }

  if (loop_slots_free === 0) {
    html += "<p class='mine-hint mine-hint-center'>Warteschlange voll – 4 Schleifen aktiv.</p>";
  }

  return html;
}

/* ─────────────────────────────────────────────────
   Ressourcen-Raster (wiederverwendbar für select + loop)
   mode: "select" | "loop"
───────────────────────────────────────────────── */
function renderResourceGrid(production, activeResource, buildingId, mode) {
  const buttons = production.map(r => {
    const isActive = r.resource === activeResource;
    return (
      "<button class='mine-res-btn" + (isActive ? " mine-res-btn-active" : "") + "'" +
      " data-resource='" + r.resource + "'" +
      " data-building='" + buildingId + "'" +
      " data-mode='" + mode + "'" +
      (isActive ? " disabled" : "") + ">" +
      "<span class='mine-res-btn-icon'>" + resourceIcon(r.resource) + "</span>" +
      "<span class='mine-res-btn-name'>" + resourceLabel(r.resource) + "</span>" +
      "<span class='mine-res-btn-amount'>+" + r.amount + "/Zyklus</span>" +
      "</button>"
    );
  }).join("");

  return "<div class='mine-res-selector'>" + buttons + "</div>";
}

/* ─────────────────────────────────────────────────
   Collect-Button
───────────────────────────────────────────────── */
function renderCollectSection(data, buildingId) {
  return (
    "<div class='mine-actions'>" +
    "<button class='mine-btn-collect" + (data.ready ? "" : " mine-btn-disabled") + "'" +
    " id='mine-collect-btn'" +
    " data-building='" + buildingId + "'" +
    (data.ready ? "" : " disabled") + ">" +
    (data.ready ? "Abholen" : "Noch nicht bereit") +
    "</button>" +
    "</div>"
  );
}

function renderDivider() {
  return "<div class='mine-divider'></div>";
}

/* ─────────────────────────────────────────────────
   Event: Toggle Schleifenpicker
───────────────────────────────────────────────── */
document.addEventListener("click", (e) => {
  const btn = e.target.closest("#mine-queue-toggle");
  if (!btn || btn.disabled) return;

  const picker = document.getElementById("mine-loop-picker");
  if (!picker) return;

  const isOpen = picker.style.display !== "none";
  picker.style.display = isOpen ? "none" : "block";
  btn.classList.toggle("mine-btn-add-loop-open", !isOpen);
});

/* ─────────────────────────────────────────────────
   Event: Ressource wählen (select) oder Schleife buchen (loop)
───────────────────────────────────────────────── */
document.addEventListener("click", async (e) => {
  const btn = e.target.closest(".mine-res-btn");
  if (!btn || btn.disabled || btn.classList.contains("mine-res-btn-active")) return;

  const resource   = btn.dataset.resource;
  const buildingId = btn.dataset.building;
  const mode       = btn.dataset.mode; // "select" | "loop"

  document.querySelectorAll(".mine-res-btn").forEach(b => (b.disabled = true));

  const endpoint = mode === "loop"
    ? "/api/mine/" + buildingId + "/loop"
    : "/api/mine/" + buildingId + "/select";

  try {
    const res = await fetch(endpoint, {
      method:  "POST",
      headers: { "Content-Type": "application/json" },
      body:    JSON.stringify({ resource }),
    });
    if (!res.ok) throw new Error("API Fehler");
    const data = await res.json();

    if (data.error) {
      showNotification(data.error, "Mine", "⛏️");
      await renderMineStatus(buildingId);
      return;
    }

    if (mode === "loop") {
      showNotification(
        "Schleife hinzugefügt!\n" + resourceLabel(resource) + " – 5h\n" +
        "Noch " + data.loop_slots_free + " Slot(s) frei.",
        "Mine", "💎"
      );
    } else {
      showNotification(
        resourceLabel(resource) + " ausgewählt.\n5h Session startet jetzt.",
        "Mine", "⛏️"
      );
    }

    await renderMineStatus(buildingId);
    if (mode === "loop") await refreshHud();
  } catch (err) {
    console.error("Mine Fehler:", err);
    await renderMineStatus(buildingId);
  }
});

/* ─────────────────────────────────────────────────
   Event: Abholen
───────────────────────────────────────────────── */
document.addEventListener("click", async (e) => {
  const btn = e.target.closest("#mine-collect-btn");
  if (!btn || btn.disabled) return;

  const buildingId = btn.dataset.building;
  btn.disabled    = true;
  btn.textContent = "Wird abgeholt...";

  try {
    const res = await fetch("/api/mine/" + buildingId + "/collect", {
      method: "POST",
    });
    if (!res.ok) throw new Error("API Fehler");
    const data = await res.json();

    if (data.error) {
      showNotification(
        data.ready_in_display
          ? "Noch nicht bereit.\nBereit in: " + data.ready_in_display
          : data.error,
        "Mine", "⛏️"
      );
      await renderMineStatus(buildingId);
      return;
    }

    const c = data.collected;
    let msg = "Abgeholt!\n" + resourceLabel(c.resource) + ": +" + c.amount;
    if (data.next_resource) {
      msg += "\n\nNächste Session: " + resourceLabel(data.next_resource) + " (5h)";
    } else {
      msg += "\n\nKeine weiteren Schleifen – neue Ressource wählen.";
    }

    showNotification(msg, "Mine", "⛏️");
    await renderMineStatus(buildingId);
    await refreshHud();
  } catch (err) {
    console.error("Abholen Fehler:", err);
    showNotification("Fehler beim Abholen. Bitte erneut versuchen.", "Fehler", "⚠️");
    await renderMineStatus(buildingId);
  }
});

/* ─────────────────────────────────────────────────
   Countdown-Timer
───────────────────────────────────────────────── */
let countdownInterval = null;

function startCountdown(buildingId, data) {
  if (countdownInterval) clearInterval(countdownInterval);
  if (data.is_full) return;

  countdownInterval = setInterval(() => {
    const el = document.getElementById("mine-countdown");
    if (!el) { clearInterval(countdownInterval); return; }

    let secs = parseInt(el.dataset.seconds, 10) - 1;
    if (secs < 0) secs = 0;
    el.dataset.seconds = secs;
    el.textContent = Math.floor(secs / 60) + "m " + (secs % 60) + "s";

    if (secs === 0) {
      clearInterval(countdownInterval);
      renderMineStatus(buildingId);
    }
  }, 1000);
}

/* ─────────────────────────────────────────────────
   Icons & Labels
───────────────────────────────────────────────── */
function resourceIcon(resource) {
  const imgMap = {
    iron:  "/images/items/eisen.png",
    gold:  "/images/items/goldmuenze.png",
    wood:  "/images/items/holz.png",
    stone: "/images/items/stein.png",
  };
  if (imgMap[resource]) {
    return (
      "<span class='mine-resource-icon-" + resource + "'>" +
      "<img src='" + imgMap[resource] + "' alt=''>" +
      "</span>"
    );
  }
  return "📦";
}

function resourceLabel(resource) {
  const map = { gold: "Gold", iron: "Eisen", stone: "Stein", wood: "Holz" };
  return map[resource] || resource;
}