{% extends "base.html" %}

{% block title %}Entries for {{ page.date_text }}{% endblock %}

{% block content %}
<a id="back-to-calendar" href="/" class="inline-flex items-center gap-2 text-sm font-medium text-slate-600 transition hover:text-slate-900">
  <span>&larr;</span>
  <span>Back to calendar</span>
</a>

<section class="mt-4 rounded-3xl border border-slate-200/80 bg-white/80 p-6 shadow-sm backdrop-blur">
  <h1 class="text-3xl font-bold tracking-tight">{{ page.date_text }}</h1>
  <p class="mt-3 inline-flex items-center rounded-full bg-emerald-100 px-3 py-1 text-sm font-semibold text-emerald-900">
    Daily total: {{ page.daily_total }} cal
  </p>

  <div class="mt-5 rounded-2xl border border-slate-200 bg-slate-50 p-4">
    <h2 class="text-sm font-semibold uppercase tracking-wide text-slate-600">Daily weight (lbs)</h2>
    <form id="weight-form" method="post" action="/day/{{ page.date_text }}/weight" data-autosave="true" class="mt-3 flex flex-wrap items-center gap-2">
      <input
        type="number"
        step="0.1"
        min="1"
        name="weight"
        value="{{ page.weight_value }}"
        placeholder="Weight (lbs)"
        required
        class="w-40 rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 focus:border-teal-500 focus:outline-none"
      />
      <span data-status-for="weight-form" class="text-xs text-slate-500">Auto-save enabled</span>
    </form>
  </div>

  <div class="mt-5 rounded-2xl border border-slate-200 bg-slate-50 p-4">
    <h2 class="text-sm font-semibold uppercase tracking-wide text-slate-600">Add entry</h2>
    <form method="post" action="/day/{{ page.date_text }}/add" class="mt-3 grid gap-2 sm:grid-cols-3">
      <input
        type="text"
        name="name"
        placeholder="Food name"
        required
        class="sm:col-span-2 w-full rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 focus:border-teal-500 focus:outline-none"
      />
      <input
        type="number"
        name="calories"
        placeholder="Calories"
        min="0"
        required
        class="w-full rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 focus:border-teal-500 focus:outline-none"
      />
      <div class="sm:col-span-3">
        <button type="submit" class="rounded-lg bg-slate-900 px-4 py-2 text-sm font-semibold text-white hover:bg-slate-700">Add entry</button>
      </div>
    </form>
  </div>

  <div class="mt-5 overflow-hidden rounded-2xl border border-slate-200">
    <table class="w-full border-collapse">
      <thead class="bg-slate-50 text-left text-xs uppercase tracking-wide text-slate-500">
        <tr><th class="px-5 py-3">Entry</th><th class="px-5 py-3">Calories</th></tr>
      </thead>
      <tbody class="bg-white">
        {% if page.entries.is_empty() %}
        <tr><td colspan="2" class="px-5 py-8 text-center text-slate-500">No entries yet for this day.</td></tr>
        {% else %}
          {% for entry in page.entries %}
          <tr class="border-t border-slate-200 align-top">
            <td class="px-5 py-3">
              <form id="entry-form-{{ entry.id }}" method="post" action="/day/{{ page.date_text }}/entry/{{ entry.id }}/update" data-autosave="true" class="grid gap-2 md:grid-cols-2">
                <input
                  type="text"
                  name="name"
                  value="{{ entry.name }}"
                  required
                  class="w-full rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 focus:border-teal-500 focus:outline-none"
                />
                <input
                  type="number"
                  name="calories"
                  value="{{ entry.calories }}"
                  min="0"
                  required
                  class="w-full rounded-lg border border-slate-300 bg-white px-3 py-2 text-sm text-slate-900 focus:border-teal-500 focus:outline-none"
                />
                <div class="md:col-span-2 text-xs text-slate-500" data-status-for="entry-form-{{ entry.id }}">Auto-save enabled</div>
              </form>
              <form method="post" action="/day/{{ page.date_text }}/entry/{{ entry.id }}/delete" class="mt-2">
                <button type="submit" class="rounded-lg border border-rose-200 bg-rose-50 px-3 py-1.5 text-xs font-semibold text-rose-700 hover:bg-rose-100">Delete</button>
              </form>
            </td>
            <td class="px-5 py-3 font-semibold text-slate-900">{{ entry.calories }} cal</td>
          </tr>
          {% endfor %}
        {% endif %}
      </tbody>
    </table>
  </div>
</section>
{% endblock %}

{% block scripts %}
<script>
  const AUTO_SAVE_DELAY_MS = 700;
  const autosaveForms = Array.from(document.querySelectorAll("form[data-autosave='true']"));
  const backLink = document.getElementById("back-to-calendar");
  const pending = new Map(); // form -> timer id
  const dirty = new Set();

  function formStatus(form) {
    return document.querySelector(`[data-status-for="${form.id}"]`);
  }

  function setStatus(form, text, cssClass = "text-slate-500") {
    const node = formStatus(form);
    if (!node) return;
    node.className = `text-xs ${cssClass}`;
    node.textContent = text;
  }

  function serializeForm(form) {
    return new URLSearchParams(new FormData(form));
  }

  async function saveForm(form) {
    const body = serializeForm(form);
    setStatus(form, "Saving...", "text-amber-700");
    try {
      const response = await fetch(form.action, {
        method: "POST",
        headers: { "Content-Type": "application/x-www-form-urlencoded" },
        body,
        credentials: "same-origin"
      });
      if (!response.ok) throw new Error(`HTTP ${response.status}`);
      dirty.delete(form);
      setStatus(form, "Saved", "text-emerald-700");
    } catch (error) {
      setStatus(form, "Save failed", "text-rose-700");
    }
  }

  function queueAutosave(form) {
    dirty.add(form);
    setStatus(form, "Editing...", "text-slate-500");
    if (pending.has(form)) {
      clearTimeout(pending.get(form));
    }
    const timer = setTimeout(async () => {
      pending.delete(form);
      await saveForm(form);
    }, AUTO_SAVE_DELAY_MS);
    pending.set(form, timer);
  }

  async function flushAllAutosaves() {
    for (const [form, timer] of pending.entries()) {
      clearTimeout(timer);
      pending.delete(form);
    }
    for (const form of Array.from(dirty)) {
      await saveForm(form);
    }
  }

  autosaveForms.forEach((form) => {
    form.addEventListener("input", () => queueAutosave(form));
    form.addEventListener("change", () => queueAutosave(form));
    form.addEventListener("submit", async (event) => {
      event.preventDefault();
      if (pending.has(form)) {
        clearTimeout(pending.get(form));
        pending.delete(form);
      }
      dirty.add(form);
      await saveForm(form);
    });
  });

  backLink.addEventListener("click", async (event) => {
    event.preventDefault();
    await flushAllAutosaves();
    window.location.href = backLink.getAttribute("href");
  });

  document.addEventListener("keydown", async (event) => {
    if (event.key !== "Escape") return;
    event.preventDefault();
    await flushAllAutosaves();
    window.location.href = "/";
  });

  window.addEventListener("beforeunload", () => {
    // Best-effort last-moment save for browser back/close/refresh.
    for (const form of Array.from(dirty)) {
      navigator.sendBeacon(form.action, serializeForm(form));
    }
  });
</script>
{% endblock %}