const MODULE_ID = "sla-ops-clock";
const SETTING_KEY = "opsState";

function defaultState() {
  return {
    opName: "New SLA Operation",
    stage: "Insertion",
    clock: 0,
    heat: 0,
    collateral: 0,
    pressure: 0,
    trigger: "Media attention spikes",
    notes: ""
  };
}

function getState() {
  return foundry.utils.mergeObject(defaultState(), game.settings.get(MODULE_ID, SETTING_KEY) ?? {});
}

async function setState(nextState) {
  await game.settings.set(MODULE_ID, SETTING_KEY, foundry.utils.mergeObject(defaultState(), nextState ?? {}));
}

function renderChatSummary(state) {
  return `
    <section class="sla-ops-clock-chat">
      <h2>${foundry.utils.escapeHTML(state.opName || "SLA Operation")}</h2>
      <p><strong>Stage:</strong> ${foundry.utils.escapeHTML(state.stage || "Unstated")}</p>
      <p><strong>Clock:</strong> ${state.clock}/8 | <strong>Heat:</strong> ${state.heat} | <strong>Collateral:</strong> ${state.collateral} | <strong>Pressure:</strong> ${state.pressure}</p>
      <p><strong>Escalation Trigger:</strong> ${foundry.utils.escapeHTML(state.trigger || "None")}</p>
      ${state.notes ? `<p><strong>GM Notes:</strong> ${foundry.utils.escapeHTML(state.notes)}</p>` : ""}
    </section>
  `;
}

function getHtmlRoot(html) {
  return html instanceof HTMLElement ? html : html?.[0] ?? null;
}

class SlaOpsClockApp extends FormApplication {
  static get defaultOptions() {
    return foundry.utils.mergeObject(super.defaultOptions, {
      id: "sla-ops-clock-app",
      title: "SLA Ops Clock",
      template: "modules/sla-ops-clock/templates/ops-clock.hbs",
      classes: ["sla-ops-clock"],
      width: 560,
      height: "auto",
      submitOnChange: false,
      closeOnSubmit: false,
      resizable: true
    });
  }

  async getData() {
    const state = getState();
    return {
      state,
      segments: Array.from({ length: 8 }, (_value, index) => ({
        index,
        filled: index < Number(state.clock || 0)
      }))
    };
  }

  activateListeners(html) {
    super.activateListeners(html);
    html.find("[data-action='advance']").on("click", async () => {
      const current = await this._collectState();
      current.clock = Math.min(8, Number(current.clock || 0) + 1);
      current.pressure = Math.min(9, Number(current.pressure || 0) + 1);
      await setState(current);
      this.render(false);
    });
    html.find("[data-action='post']").on("click", async () => {
      const current = await this._collectState();
      await setState(current);
      await ChatMessage.create({
        user: game.user.id,
        speaker: { alias: "SLA Ops Clock" },
        content: renderChatSummary(current)
      });
    });
    html.find("[data-action='reset']").on("click", async () => {
      await setState(defaultState());
      this.render(false);
    });
  }

  async _collectState() {
    const form = this.form;
    if (!form) return getState();
    const fd = new foundry.applications.ux.FormDataExtended(form);
    return foundry.utils.mergeObject(getState(), fd.object);
  }

  async _updateObject(_event, formData) {
    await setState(formData);
    ui.notifications.info("SLA Ops Clock saved.");
  }

  static open() {
    return new SlaOpsClockApp().render(true);
  }
}

function installSceneButton(app, html) {
  if (!game.user?.isGM) return;
  const root = getHtmlRoot(html);
  const header = root?.querySelector(".directory-header .header-actions, .directory-header .action-buttons");
  if (!header || header.querySelector(".sla-ops-clock-open")) return;
  const button = document.createElement("button");
  button.type = "button";
  button.className = "sla-ops-clock-open";
  button.innerHTML = `<i class="fas fa-gauge-high"></i> Ops Clock`;
  button.addEventListener("click", () => SlaOpsClockApp.open());
  header.appendChild(button);
}

Hooks.once("init", () => {
  game.settings.register(MODULE_ID, SETTING_KEY, {
    scope: "world",
    config: false,
    type: Object,
    default: defaultState()
  });

  game.settings.registerMenu(MODULE_ID, "opsClockMenu", {
    name: "SLA Ops Clock",
    label: "Open Ops Clock",
    hint: "Track mission heat, collateral, and pressure for the current operation.",
    icon: "fas fa-gauge-high",
    type: SlaOpsClockApp,
    restricted: true
  });
});

Hooks.on("renderSceneDirectory", installSceneButton);