/**
 * Add a History tab to PF1 actor sheets with HP/XP/Currency subtabs.
 * Requires the corresponding flag-tracking macros to populate data.
 */

const TAB_ID = "pf1-history";
const TAB_LABEL = "History";

if (!game.system.id.includes("pf1")) {
  ui.notifications.warn("This macro is intended for the PF1 system.");
  return;
}

game.pf1 ??= {};
game.pf1.historyTab ??= {};

const PF1_SHEET_HOOKS = [
  "renderActorSheetPFCharacter",
  "renderActorSheetPFNPC",
  "renderActorSheetPFNPCLoot",
  "renderActorSheetPFNPCLite",
  "renderActorSheetPFTrap",
  "renderActorSheetPFVehicle",
  "renderActorSheetPFHaunt",
  "renderActorSheetPFBasic",
];

game.pf1.historyTab.renderHooks ??= [];
if (game.pf1.historyTab.renderHooks.length) {
  return ui.notifications.info("History tab hooks already active.");
}

for (const hook of PF1_SHEET_HOOKS) {
  const id = Hooks.on(hook, (sheet, html) => {
    const delays = [0, 50, 200];
    delays.forEach((delay) =>
      setTimeout(() => {
        try {
          injectHistoryTab(sheet);
        } catch (err) {
          console.error("PF1 History Tab | Failed to render history tab", err);
        }
      }, delay)
    );
  });
  game.pf1.historyTab.renderHooks.push({ event: hook, id });
}

ui.notifications.info("PF1 History tab enabled. Reopen actor sheets to see the new tab.");

function injectHistoryTab(sheet) {
  if (!sheet?.element?.length) return;
  console.log("PF1 History Tab | Injecting for", sheet.actor?.name, sheet.id);
  const actor = sheet.actor;
  const nav = sheet.element.find('.sheet-navigation.tabs[data-group="primary"]').first();
  const body = sheet.element.find(".sheet-body").first();
  if (!nav.length || !body.length) return;

  ensureHistoryTab(nav);

  const existing = body.find(`.tab[data-tab="${TAB_ID}"]`).first();
  const content = buildHistoryContent(actor);
  if (existing.length) existing.html(content);
  else body.append(`<div class="tab history-tab" data-tab="${TAB_ID}" data-group="primary">${content}</div>`);

  sheet._tabs?.forEach((tabs) => tabs.bind(sheet.element[0]));

  setupObserver(sheet, nav);
}

function ensureHistoryTab(nav) {
  if (nav.find(`[data-tab="${TAB_ID}"]`).length) return;
  nav.append(`<a class="item" data-group="primary" data-tab="${TAB_ID}">${TAB_LABEL}</a>`);
}

function setupObserver(sheet, nav) {
  game.pf1.historyTab.observers ??= new Map();
  const key = sheet.id;
  if (game.pf1.historyTab.observers.has(key)) return;

  const observer = new MutationObserver(() => {
    const currentNav = sheet.element.find('.sheet-navigation.tabs[data-group="primary"]').first();
    if (!currentNav.length) return;
    ensureHistoryTab(currentNav);
  });

  observer.observe(sheet.element[0], { childList: true, subtree: true });
  game.pf1.historyTab.observers.set(key, observer);

  const closeHandler = () => {
    observer.disconnect();
    game.pf1.historyTab.observers.delete(key);
    sheet.element.off("remove", closeHandler);
  };
  sheet.element.on("remove", closeHandler);
}

function buildHistoryContent(actor) {
  const configs = [
    {
      id: "hp",
      label: "HP",
      flag: "pf1HpHistory",
      columns: [
        { label: "Timestamp", render: (e) => formatDate(e.timestamp) },
        { label: "HP", render: (e) => e.hp },
        { label: "Δ", render: (e) => e.diff },
        { label: "User", render: (e) => e.user ?? "" },
        { label: "Source", render: (e) => e.source ?? "" },
      ],
    },
    {
      id: "xp",
      label: "XP",
      flag: "pf1XpHistory",
      columns: [
        { label: "Timestamp", render: (e) => formatDate(e.timestamp) },
        { label: "XP", render: (e) => e.value },
        { label: "Δ", render: (e) => e.diff },
        { label: "User", render: (e) => e.user ?? "" },
      ],
    },
    {
      id: "currency",
      label: "Currency",
      flag: "pf1CurrencyHistory",
      columns: [
        { label: "Timestamp", render: (e) => formatDate(e.timestamp) },
        { label: "Totals", render: (e) => e.value },
        { label: "Δ", render: (e) => e.diff },
        { label: "User", render: (e) => e.user ?? "" },
      ],
    },
  ];

  const nav = configs
    .map((cfg, idx) => `<a class="history-subtab ${idx === 0 ? "active" : ""}" data-history-subtab="${cfg.id}">${cfg.label}</a>`)
    .join("");

  const panels = configs
    .map((cfg, idx) => {
      const entries = actor.getFlag("world", cfg.flag) ?? [];
      const table = renderHistoryTable(entries, cfg.columns, cfg.id);
      return `<section class="history-panel" data-history-panel="${cfg.id}" style="display:${idx === 0 ? "block" : "none"}">${table}</section>`;
    })
    .join("");

  return `
  <section class="pf1-history-root" data-history-block="history-tab">
    <nav class="history-subnav">
      ${nav}
    </nav>
    <div class="history-panels">
      ${panels}
    </div>
    <script type="text/javascript">
      (function(){
        const root = document.currentScript.closest('[data-history-block="history-tab"]');
        if (!root) return;
        const tabs = Array.from(root.querySelectorAll('[data-history-subtab]'));
        const panels = Array.from(root.querySelectorAll('[data-history-panel]'));
        tabs.forEach((btn) => {
          btn.addEventListener('click', () => {
            const target = btn.dataset.historySubtab;
            tabs.forEach((n) => n.classList.toggle('active', n === btn));
            panels.forEach((panel) => (panel.style.display = panel.dataset.historyPanel === target ? 'block' : 'none'));
          });
        });
      })();
    </script>
  </section>
  `;
}

function renderHistoryTable(entries, columns, id) {
  if (!entries.length) return `<p class="history-empty">No ${id.toUpperCase()} history recorded.</p>`;

  const rows = entries
    .map(
      (entry) => `
      <tr data-ts="${entry.timestamp}">
        ${columns.map((col) => `<td>${col.render(entry) ?? ""}</td>`).join("")}
      </tr>`
    )
    .join("");

  return `
  <div class="history-filters">
    <label>From <input type="date" data-filter="from-${id}"></label>
    <label>To <input type="date" data-filter="to-${id}"></label>
  </div>
  <table class="history-table history-${id}">
    <thead>
      <tr>${columns.map((col) => `<th>${col.label}</th>`).join("")}</tr>
    </thead>
    <tbody>
      ${rows}
    </tbody>
  </table>
  <script type="text/javascript">
    (function(){
      const root = document.currentScript.closest('.history-panel[data-history-panel="${id}"]');
      if (!root) return;
      const rows = Array.from(root.querySelectorAll("tbody tr"));
      const fromInput = root.querySelector('input[data-filter="from-${id}"]');
      const toInput = root.querySelector('input[data-filter="to-${id}"]');
      function applyFilters(){
        const from = fromInput?.value ? Date.parse(fromInput.value) : null;
        const to = toInput?.value ? Date.parse(toInput.value) + 86399999 : null;
        rows.forEach((row) => {
          const ts = Number(row.dataset.ts);
          const visible = (!from || ts >= from) && (!to || ts <= to);
          row.style.display = visible ? "" : "none";
        });
      }
      fromInput?.addEventListener("input", applyFilters);
      toInput?.addEventListener("input", applyFilters);
      applyFilters();
    })();
  </script>
  `;
}

function formatDate(ts) {
  return new Date(ts).toLocaleString();
}