(() => {
  const roots = document.querySelectorAll(".scene-inspector-root");
  if (!roots.length) {
    return;
  }

  const slugify = (value) => value
    .toLowerCase()
    .replace(/&/g, "and")
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-|-$/g, "");

  roots.forEach((root) => {
    const sceneId = root.querySelector("[name='SceneID']")?.value || "new";
    const storagePrefix = `plotline.inspector.${sceneId}.`;
    const defaultOpen = new Set(["overview", "timing", "characters"]);
    const sections = [...root.querySelectorAll(".inspector-section")];

    sections.forEach((section) => {
      if (section.dataset.enhanced === "true") {
        return;
      }

      const heading = section.querySelector("h3, h2");
      const title = section.dataset.sectionTitle || heading?.textContent?.trim() || "Overview";
      const slug = slugify(title);
      const sectionId = section.dataset.sectionId || `inspector-${slug}`;
      const storageKey = sectionId.replace(/^inspector-/, "");
      section.id = sectionId;
      section.dataset.searchText = `${title} ${section.textContent}`.toLowerCase();
      section.dataset.enhanced = "true";

      const body = document.createElement("div");
      body.className = "inspector-accordion-body";
      while (section.firstChild) {
        body.appendChild(section.firstChild);
      }

      const button = document.createElement("button");
      button.type = "button";
      button.className = "inspector-accordion-toggle";
      button.setAttribute("aria-expanded", "false");
      const count = section.querySelectorAll(".asset-event-item, .thread-event-item, .warning-mini-card, .dependency-card, .metric-slider").length;
      button.innerHTML = `<span>${title}</span><span class="accordion-count">${count || ""}</span>`;

      section.append(button, body);

      const stored = localStorage.getItem(`${storagePrefix}${storageKey}`);
      const isOpen = stored === null ? defaultOpen.has(storageKey) : stored === "open";
      section.classList.toggle("is-open", isOpen);
      button.setAttribute("aria-expanded", String(isOpen));

      button.addEventListener("click", () => {
        const nextOpen = !section.classList.contains("is-open");
        section.classList.toggle("is-open", nextOpen);
        button.setAttribute("aria-expanded", String(nextOpen));
        localStorage.setItem(`${storagePrefix}${storageKey}`, nextOpen ? "open" : "closed");
      });
    });

    root.querySelectorAll(".inspector-nav-links a").forEach((link) => {
      link.addEventListener("click", (event) => {
        const target = root.querySelector(link.getAttribute("href"));
        if (!target) {
          return;
        }

        event.preventDefault();
        target.classList.add("is-open");
        target.querySelector(".inspector-accordion-toggle")?.setAttribute("aria-expanded", "true");
        target.scrollIntoView({ behavior: "smooth", block: "start" });
      });
    });

    const search = root.querySelector("[data-inspector-search]");
    search?.addEventListener("input", () => {
      const query = search.value.trim().toLowerCase();
      sections.forEach((section) => {
        const matches = !query || section.dataset.searchText.includes(query);
        section.classList.toggle("is-filtered-out", !matches);
        if (matches && query) {
          section.classList.add("is-open");
          section.querySelector(".inspector-accordion-toggle")?.setAttribute("aria-expanded", "true");
        }
      });
    });

    if ("IntersectionObserver" in window) {
      const navLinks = [...root.querySelectorAll(".inspector-nav-links a")];
      const observer = new IntersectionObserver((entries) => {
        entries.forEach((entry) => {
          if (!entry.isIntersecting) {
            return;
          }

          navLinks.forEach((link) => {
            link.classList.toggle("active", link.getAttribute("href") === `#${entry.target.id}`);
          });
        });
      }, { root: root.closest(".scene-inspector-panel") || null, rootMargin: "-10% 0px -70% 0px" });

      sections.forEach((section) => observer.observe(section));
    }
  });
})();

(() => {
  const chartRoots = document.querySelectorAll("[data-metric-shape-chart]");
  if (!chartRoots.length) {
    return;
  }

  const colours = [
    "#2f6f63",
    "#b35f3b",
    "#6750a4",
    "#c58b2b",
    "#7d3f52",
    "#33759b",
    "#9c4d8f",
    "#a33d3d",
    "#6f8f3d",
    "#d08a2f",
    "#444b57"
  ];

  const defaultMetrics = new Set(["Overall Intensity", "Tension", "Emotional Weight", "Action"]);

  const chapterGuidePlugin = {
    id: "plotlineChapterGuides",
    afterDraw(chart) {
      const scenes = chart.config.options.plugins.plotlineScenes || [];
      const { ctx, chartArea, scales } = chart;
      if (!scenes.length || !scales.x) {
        return;
      }

      ctx.save();
      ctx.strokeStyle = "rgba(47, 111, 99, 0.16)";
      ctx.fillStyle = "rgba(82, 75, 65, 0.58)";
      ctx.lineWidth = 1;
      ctx.font = "700 10px system-ui, -apple-system, Segoe UI, sans-serif";

      let previousChapter = null;
      scenes.forEach((scene, index) => {
        if (scene.chapterLabel === previousChapter) {
          return;
        }

        const x = scales.x.getPixelForValue(index);
        ctx.beginPath();
        ctx.moveTo(x, chartArea.top);
        ctx.lineTo(x, chartArea.bottom);
        ctx.stroke();
        ctx.fillText(scene.chapterLabel, Math.min(x + 4, chartArea.right - 70), chartArea.bottom + 22);
        previousChapter = scene.chapterLabel;
      });

      ctx.restore();
    }
  };

  if (window.Chart) {
    Chart.register(chapterGuidePlugin);
  }

  chartRoots.forEach((root) => {
    const payloadScript = root.querySelector("script[type='application/json']");
    const canvas = root.querySelector("canvas");
    const toggleHost = root.querySelector("[data-metric-toggles]");
    const fallback = root.querySelector("[data-chart-fallback]");
    if (!payloadScript || !canvas) {
      return;
    }

    let payload;
    try {
      payload = JSON.parse(payloadScript.textContent || "{}");
    } catch {
      fallback?.classList.remove("d-none");
      return;
    }

    if (!window.Chart || !payload.scenes?.length || !payload.metrics?.length) {
      fallback?.classList.remove("d-none");
      return;
    }

    const labels = payload.scenes.map((scene) => scene.axisLabel);
    const sceneIndexById = new Map(payload.scenes.map((scene, index) => [scene.sceneId, index]));
    const datasets = payload.metrics.map((metric, metricIndex) => {
      const pointMap = new Map(metric.points.map((point) => [point.sceneId, point.value]));
      const colour = colours[metricIndex % colours.length];
      return {
        label: metric.metricName,
        data: payload.scenes.map((scene) => pointMap.get(scene.sceneId) ?? null),
        borderColor: colour,
        backgroundColor: colour,
        pointBackgroundColor: colour,
        pointBorderColor: "#fff",
        pointBorderWidth: 1.5,
        pointRadius: 3,
        pointHoverRadius: 5,
        borderWidth: 2,
        tension: 0.35,
        spanGaps: true,
        hidden: !defaultMetrics.has(metric.metricName)
      };
    });

    toggleHost.innerHTML = "";
    datasets.forEach((dataset, index) => {
      const id = `metric-toggle-${Math.random().toString(36).slice(2)}-${index}`;
      const label = document.createElement("label");
      label.className = "metric-toggle-pill";
      label.style.setProperty("--metric-colour", dataset.borderColor);
      label.innerHTML = `<input type="checkbox" id="${id}" ${dataset.hidden ? "" : "checked"}><span>${dataset.label}</span>`;
      toggleHost.appendChild(label);
      label.querySelector("input").addEventListener("change", (event) => {
        chart.setDatasetVisibility(index, event.target.checked);
        chart.update();
      });
    });

    const chart = new Chart(canvas, {
      type: "line",
      data: { labels, datasets },
      options: {
        responsive: true,
        maintainAspectRatio: false,
        interaction: { mode: "nearest", intersect: false },
        scales: {
          y: {
            min: 1,
            max: 10,
            ticks: { stepSize: 1 },
            grid: { color: "rgba(82, 75, 65, 0.10)" }
          },
          x: {
            ticks: {
              maxRotation: 0,
              autoSkip: true,
              maxTicksLimit: 16
            },
            grid: { display: false }
          }
        },
        plugins: {
          legend: { display: false },
          plotlineScenes: payload.scenes,
          tooltip: {
            callbacks: {
              title(items) {
                const scene = payload.scenes[items[0].dataIndex];
                return `${scene.chapterLabel}, Scene ${scene.sceneNumber}: ${scene.sceneTitle}`;
              },
              label(item) {
                return `${item.dataset.label}: ${item.formattedValue}`;
              },
              afterBody(items) {
                const scene = payload.scenes[items[0].dataIndex];
                return scene.bookTitle ? scene.bookTitle : "";
              }
            }
          }
        }
      }
    });

    canvas.addEventListener("click", (event) => {
      const points = chart.getElementsAtEventForMode(event, "nearest", { intersect: true }, true);
      if (!points.length) {
        return;
      }

      const scene = payload.scenes[points[0].index];
      if (scene?.timelineUrl) {
        window.location.href = scene.timelineUrl;
      }
    });
  });
})();