{% extends "base.html" %}

{% block content %}
  <article class="card">
    <h1 class="page-title" id="post-title" style="margin-bottom: 6px;">
      {{ post.title }}
    </h1>
    <p class="meta" id="post-meta" style="margin: 0 0 16px;">
      {{ post.created_at }}
      {% if post.author_username %}
        · by {{ post.author_username }}
      {% endif %}
    </p>

    <!-- View mode -->
    <div id="post-view" style="line-height: 1.6; font-size: 15px;">
      {{ post_html | safe }}
    </div>

    <!-- Edit mode (hidden by default) -->
    {% if current_user %}
      <form id="edit-form" style="display:none; margin-top: 12px;">
        <div style="margin-bottom: 8px;">
          <label for="edit-title" style="display:block; font-weight:600; margin-bottom:4px;">
            Title
          </label>
          <input
            id="edit-title"
            type="text"
            value="{{ post.title }}"
            style="width:100%; padding:8px; font-size:15px; box-sizing:border-box;"
          />
        </div>

        <div style="margin-bottom: 8px;">
          <label for="edit-content" style="display:block; font-weight:600; margin-bottom:4px;">
            Content (Markdown)
          </label>
          <textarea
            id="edit-content"
            rows="12"
            style="width:100%; padding:8px; font-size:14px; line-height:1.5; box-sizing:border-box;"
          >{{ post.content }}</textarea>
        </div>

        <div style="display:flex; gap:8px; flex-wrap:wrap; margin-top:8px;">
          <button type="submit" class="btn">Save changes</button>
          <button type="button" id="cancel-edit" class="btn btn-secondary">Cancel</button>
        </div>

        <p id="edit-error" style="color:#b00020; font-size:13px; margin-top:8px; display:none;"></p>
      </form>
    {% endif %}

    <div style="margin-top: 18px; display:flex; gap:10px; flex-wrap:wrap;">
      <a href="/" class="btn">← Back to posts</a>

      {% if current_user %}
        <button type="button" id="edit-btn" class="btn btn-secondary">
          ✏️ Edit post
        </button>
        <button type="button" id="delete-btn" class="btn btn-danger">
          🗑 Delete post
        </button>
      {% endif %}
    </div>
  </article>

  {% if current_user %}
  <script>
    (function () {
      const postId      = "{{ post.id }}";
      const titleEl     = document.getElementById("post-title");
      const metaEl      = document.getElementById("post-meta");
      const postView    = document.getElementById("post-view");

      const editBtn     = document.getElementById("edit-btn");
      const deleteBtn   = document.getElementById("delete-btn");
      const editForm    = document.getElementById("edit-form");
      const cancelEdit  = document.getElementById("cancel-edit");
      const titleInput  = document.getElementById("edit-title");
      const contentArea = document.getElementById("edit-content");
      const errorEl     = document.getElementById("edit-error");

      function showEditMode() {
        if (!editForm) return;
        postView.style.display = "none";
        editForm.style.display = "block";
        errorEl.style.display = "none";
        errorEl.textContent = "";
      }

      function hideEditMode() {
        if (!editForm) return;
        editForm.style.display = "none";
        postView.style.display = "block";
        errorEl.style.display = "none";
        errorEl.textContent = "";
      }

      if (editBtn) {
        editBtn.addEventListener("click", function () {
          showEditMode();
        });
      }

      if (cancelEdit) {
        cancelEdit.addEventListener("click", function () {
          hideEditMode();
        });
      }

      if (editForm) {
        editForm.addEventListener("submit", async function (e) {
          e.preventDefault();
          errorEl.style.display = "none";
          errorEl.textContent = "";

          const title = titleInput.value.trim();
          const content = contentArea.value.trim();

          if (!title || !content) {
            errorEl.textContent = "Title and content cannot be empty.";
            errorEl.style.display = "block";
            return;
          }

          try {
            const res = await fetch(`/api_post/${postId}`, {
              method: "PATCH",
              headers: {
                "Content-Type": "application/json",
              },
              credentials: "include",
              body: JSON.stringify({ title, content }),
            });

            const data = await res.json().catch(() => ({}));

            if (!res.ok) {
              errorEl.textContent = data.error || "Failed to update post.";
              errorEl.style.display = "block";
              return;
            }

            // Update DOM from API response, no full page reload.
            if (data.title) {
              titleEl.textContent = data.title;
            }

            if (data.html) {
              postView.innerHTML = data.html;
            }

            // Optionally tweak meta to show updated_at if you want:
            // if (data.updated_at) { ... }

            hideEditMode();
          } catch (err) {
            console.error(err);
            errorEl.textContent = "Network error while saving changes.";
            errorEl.style.display = "block";
          }
        });
      }

      if (deleteBtn) {
        deleteBtn.addEventListener("click", async function () {
          const sure = window.confirm("Are you sure you want to delete this post? This cannot be undone.");
          if (!sure) return;

          try {
            const res = await fetch(`/api_post/${postId}`, {
              method: "DELETE",
              credentials: "include",
            });

            const data = await res.json().catch(() => ({}));

            if (!res.ok) {
              alert(data.error || "Failed to delete post.");
              return;
            }

            window.location.href = "/";
          } catch (err) {
            console.error(err);
            alert("Network error while deleting post.");
          }
        });
      }
    })();
  </script>
  {% endif %}
{% endblock %}