(() => {
  function create({
    IDS,
    CLASSES,
    USER_BUTTON_LABEL,
    normalizeText,
    isVisible,
  }) {
    function applyDialogTheme(overlay, theme) {
      const dialog = overlay?.querySelector(`#${IDS.dialog}`);

      if (!dialog) {
        return;
      }

      dialog.setAttribute("data-theme", theme);
    }

    function ensureStyles() {
      // Styles are loaded by manifest.json. This function remains as a stable callsite.
    }

    function applyTheme(header, functionsContainer, anchor, mount, overlay) {
      const headerStyle = window.getComputedStyle(header);
      const functionsStyle = window.getComputedStyle(functionsContainer);
      const sourceBackground = resolveBackgroundColor(header, headerStyle);
      const sourceForeground = resolveForegroundColor(
        header,
        functionsContainer,
        anchor,
        headerStyle,
        functionsStyle
      );
      const workbenchHeader = mix(
        sourceBackground,
        { r: 75, g: 51, b: 93, a: 1 },
        0.52
      );
      const workbenchAccent = mix(
        workbenchHeader,
        { r: 108, g: 77, b: 128, a: 1 },
        0.38
      );
      const focusColor = mix(sourceForeground, workbenchHeader, 0.28);
      const themeTargets = [mount, overlay].filter(Boolean);

      for (const target of themeTargets) {
        target.style.setProperty(
          "--arch-panel-bg",
          toColor(mix(sourceBackground, sourceForeground, 0.12))
        );
        target.style.setProperty(
          "--arch-panel-bg-hover",
          toColor(mix(sourceBackground, sourceForeground, 0.22))
        );
        target.style.setProperty(
          "--arch-panel-border",
          toColor(mix(sourceBackground, sourceForeground, 0.32))
        );
        target.style.setProperty("--arch-panel-fg", toColor(sourceForeground, 1));
        target.style.setProperty("--arch-panel-focus", toColor(focusColor, 0.94));
        target.style.setProperty(
          "--arch-panel-font",
          functionsStyle.fontFamily || headerStyle.fontFamily || "inherit"
        );
        target.style.setProperty(
          "--arch-workbench-header",
          toColor(workbenchHeader, 1)
        );
        target.style.setProperty(
          "--arch-workbench-accent",
          toColor(workbenchAccent, 1)
        );
      }
    }

    function resolveForegroundColor(
      header,
      functionsContainer,
      anchor,
      headerStyle,
      functionsStyle
    ) {
      const salesPlanningElement = findTextElement(header, "Sales Planning");
      const salesPlanningColor = salesPlanningElement
        ? parseColor(window.getComputedStyle(salesPlanningElement).color)
        : null;
      const functionsItemColor = findVisibleChildColor(functionsContainer);
      const userColor = anchor
        ? parseColor(window.getComputedStyle(anchor).color)
        : null;

      return (
        userColor ||
        functionsItemColor ||
        parseColor(functionsStyle.color) ||
        salesPlanningColor ||
        parseColor(headerStyle.color) || {
          r: 255,
          g: 255,
          b: 255,
          a: 1,
        }
      );
    }

    function resolveBackgroundColor(element, style) {
      const directBackground = parseColor(style.backgroundColor);

      if (directBackground && directBackground.a > 0) {
        return directBackground;
      }

      let current = element.parentElement;

      while (current) {
        const currentBackground = parseColor(
          window.getComputedStyle(current).backgroundColor
        );

        if (currentBackground && currentBackground.a > 0) {
          return currentBackground;
        }

        current = current.parentElement;
      }

      return { r: 75, g: 51, b: 93, a: 1 };
    }

    function parseColor(value) {
      if (!value || value === "transparent") {
        return null;
      }

      const rgbMatch = value.match(
        /rgba?\(\s*(\d{1,3})[\s,]+(\d{1,3})[\s,]+(\d{1,3})(?:[\s,/]+([.\d]+))?\s*\)/i
      );

      if (rgbMatch) {
        return {
          r: Number.parseInt(rgbMatch[1], 10),
          g: Number.parseInt(rgbMatch[2], 10),
          b: Number.parseInt(rgbMatch[3], 10),
          a: rgbMatch[4] === undefined ? 1 : Number.parseFloat(rgbMatch[4]),
        };
      }

      const hexMatch = value.match(/^#([\da-f]{3,8})$/i);

      if (!hexMatch) {
        return null;
      }

      const hexValue = hexMatch[1];

      if (hexValue.length === 3 || hexValue.length === 4) {
        const [r, g, b, a = "f"] = hexValue.split("");

        return {
          r: Number.parseInt(r + r, 16),
          g: Number.parseInt(g + g, 16),
          b: Number.parseInt(b + b, 16),
          a: Number.parseInt(a + a, 16) / 255,
        };
      }

      if (hexValue.length === 6 || hexValue.length === 8) {
        return {
          r: Number.parseInt(hexValue.slice(0, 2), 16),
          g: Number.parseInt(hexValue.slice(2, 4), 16),
          b: Number.parseInt(hexValue.slice(4, 6), 16),
          a:
            hexValue.length === 8
              ? Number.parseInt(hexValue.slice(6, 8), 16) / 255
              : 1,
        };
      }

      return null;
    }

    function mix(base, tint, amount) {
      const ratio = clamp(amount, 0, 1);

      return {
        r: Math.round(base.r + (tint.r - base.r) * ratio),
        g: Math.round(base.g + (tint.g - base.g) * ratio),
        b: Math.round(base.b + (tint.b - base.b) * ratio),
        a: base.a + (tint.a - base.a) * ratio,
      };
    }

    function toColor(color, alphaOverride) {
      const alpha = alphaOverride ?? color.a ?? 1;

      return `rgba(${color.r}, ${color.g}, ${color.b}, ${clamp(alpha, 0, 1)})`;
    }

    function clamp(value, min, max) {
      return Math.min(Math.max(value, min), max);
    }

    function findUserAnchor(container) {
      const selector = [
        `button[label="${USER_BUTTON_LABEL}"]`,
        `[role="button"][label="${USER_BUTTON_LABEL}"]`,
        `oj-button[label="${USER_BUTTON_LABEL}"]`,
        `button[aria-label="${USER_BUTTON_LABEL}"]`,
        `[role="button"][aria-label="${USER_BUTTON_LABEL}"]`,
        `[label="${USER_BUTTON_LABEL}"]`,
        `[aria-label="${USER_BUTTON_LABEL}"]`,
      ].join(", ");

      const directMatch = container.querySelector(selector);

      if (directMatch && isVisible(directMatch)) {
        return directMatch;
      }

      const fallbackMatch = Array.from(container.querySelectorAll("*")).find(
        (element) => {
          if (!isVisible(element) || element.closest(`#${IDS.mount}`)) {
            return false;
          }

          return (
            element.getAttribute("label") === USER_BUTTON_LABEL ||
            element.getAttribute("aria-label") === USER_BUTTON_LABEL
          );
        }
      );

      return fallbackMatch || null;
    }

    function findTextElement(container, expectedText) {
      const normalizedExpected = normalizeText(expectedText);
      const elements = Array.from(container.querySelectorAll("*"));

      return (
        elements.find((element) => {
          const text = normalizeText(element.textContent || "");

          return text && text.includes(normalizedExpected);
        }) || null
      );
    }

    function resolveInsertionTarget(container, anchor, mount) {
      const directAnchor = anchor ? getDirectChild(anchor, container) : null;
      const fallbackTarget = findFirstInsertionTarget(container, mount);
      const candidate = directAnchor || fallbackTarget;

      if (!candidate) {
        return null;
      }

      if (candidate === mount) {
        return findNextValidSibling(container, mount);
      }

      return candidate.parentElement === container ? candidate : null;
    }

    function getDirectChild(element, container) {
      let current = element;

      while (current && current.parentElement !== container) {
        current = current.parentElement;
      }

      return current && current.parentElement === container ? current : null;
    }

    function findFirstInsertionTarget(container, mount) {
      return Array.from(container.children).find((child) => child !== mount) || null;
    }

    function findNextValidSibling(container, mount) {
      let sibling = mount.nextElementSibling;

      while (sibling) {
        if (sibling.parentElement === container) {
          return sibling;
        }

        sibling = sibling.nextElementSibling;
      }

      return null;
    }

    function findVisibleChildColor(container) {
      const visibleChild = Array.from(container.querySelectorAll("*")).find(
        (element) => isVisible(element) && !element.closest(`#${IDS.mount}`)
      );

      return visibleChild
        ? parseColor(window.getComputedStyle(visibleChild).color)
        : null;
    }

    function lockScroll() {
      document.documentElement.classList.add(CLASSES.modalOpen);
      document.body?.classList.add(CLASSES.modalOpen);
    }

    function unlockScroll() {
      document.documentElement.classList.remove(CLASSES.modalOpen);
      document.body?.classList.remove(CLASSES.modalOpen);
    }

    return Object.freeze({
      applyDialogTheme,
      ensureStyles,
      applyTheme,
      findUserAnchor,
      resolveInsertionTarget,
      lockScroll,
      unlockScroll,
    });
  }

  globalThis.ArchPanelShellView = Object.freeze({
    create,
  });
})();