import { app } from "../../../scripts/app.js";

function filterChildDirs(allDirs, parentPrefix) {
  const prefixNorm = parentPrefix.replace(/\/$/, "").toLowerCase();
  const results = [];

  for (const dir of allDirs) {
    const parts = dir.split("/").filter(Boolean);
    if (parts.length < 1) continue;

    const parent = parts.slice(0, -1).join("/").toLowerCase();
    const child = parts[parts.length - 1];

    if (parent === prefixNorm) {
      results.push(child);
    }
  }

  return [...new Set(results)].sort();
}

function showDropdown(listEl, items, directoryWidget, inputEl) {
  listEl.innerHTML = "";
  if (items.length === 0) {
    listEl.style.display = "none";
    return;
  }
  for (const item of items) {
    const li = document.createElement("li");
    li.textContent = item;
    li.style.padding = "4px 8px";
    li.style.cursor = "pointer";
    li.style.color = "#ccc";
    li.style.listStyle = "none";
    li.addEventListener("mouseenter", () => {
      listEl.querySelectorAll("li").forEach((el) => (el.style.background = "transparent"));
      li.style.background = "#444";
    });
    li.addEventListener("click", () => {
      const newValue = inputEl._currentPrefix + item + "/";
      inputEl.value = newValue;
      inputEl._currentPrefix = newValue;
      directoryWidget.value = newValue;
      hideDropdown(listEl);
      inputEl.focus();
    });
    listEl.appendChild(li);
  }

  Object.assign(listEl.style, {
    display: "block",
    background: "#222",
    border: "1px solid #444",
    position: "absolute",
    zIndex: "9999",
    width: inputEl.offsetWidth + "px",
    maxHeight: "200px",
    overflowY: "auto",
  });
}

function hideDropdown(listEl) {
  listEl.innerHTML = "";
  listEl.style.display = "none";
}

app.registerExtension({
  name: "CompassImageLoader",

  async beforeRegisterNodeDef(nodeType, nodeData) {
    if (nodeData.name !== "CompassImageLoader") return;

    const origOnNodeCreated = nodeType.prototype.onNodeCreated;
    nodeType.prototype.onNodeCreated = function () {
      if (origOnNodeCreated) origOnNodeCreated.apply(this, []);

      const directoryWidget = this.widgets?.find((w) => w.name === "directory");
      if (!directoryWidget) return;

      const defDirs = nodeData.input?.required?.directory;
      directoryWidget._all_values = defDirs && Array.isArray(defDirs[0]) ? defDirs[0] : [];

      const filterWidget = this.widgets?.find((w) => w.name === "directory_filter");
      const inputEl = filterWidget?.inputEl;
      if (!inputEl) return;

      const listId = `compass_dir_list_${Date.now()}_${Math.random().toString(36).slice(2, 7)}`;
      const listEl = document.createElement("ul");
      listEl.id = listId;
      listEl.style.display = "none";
      listEl.style.position = "absolute";
      listEl.style.zIndex = "9999";
      document.body.appendChild(listEl);
      inputEl._listId = listId;

      inputEl._currentPrefix = directoryWidget.value || "";

      inputEl.addEventListener("input", () => {
        const val = inputEl.value;
        const lastSlash = val.lastIndexOf("/");

        let prefix, filter;
        if (lastSlash >= 0) {
          prefix = val.substring(0, lastSlash + 1);
          filter = val.substring(lastSlash + 1);
        } else {
          prefix = "";
          filter = val;
        }

        if (prefix) {
          const cleanPrefix = prefix.replace(/\/$/, "");
          const candidates = filterChildDirs(directoryWidget._all_values, cleanPrefix);
          const filtered = filter
            ? candidates.filter((c) => c.toLowerCase().startsWith(filter.toLowerCase()))
            : candidates;
          showDropdown(listEl, filtered, directoryWidget, inputEl);
        } else {
          const filtered = filter
            ? directoryWidget._all_values.filter((d) =>
                d.toLowerCase().includes(filter.toLowerCase())
              )
            : [...new Set(directoryWidget._all_values.map((d) => d.split("/")[0]))].sort();
          showDropdown(listEl, filtered, directoryWidget, inputEl);
        }
      });

      inputEl.addEventListener("focus", () => {
        const val = inputEl.value;
        const lastSlash = val.lastIndexOf("/");

        if (lastSlash >= 0 && val.endsWith("/")) {
          const prefix = val.replace(/\/$/, "");
          inputEl._currentPrefix = prefix + "/";
          const items = filterChildDirs(directoryWidget._all_values, prefix);
          showDropdown(listEl, items, directoryWidget, inputEl);
        } else if (lastSlash >= 0) {
          const prefix = val.substring(0, lastSlash + 1);
          inputEl._currentPrefix = prefix;
          inputEl.focus();
          return;
        } else {
          inputEl._currentPrefix = "";
          const items = filter
            ? directoryWidget._all_values.filter((d) =>
                d.toLowerCase().includes(val.toLowerCase())
              )
            : [...new Set(directoryWidget._all_values.map((d) => d.split("/")[0]))].sort();
          showDropdown(listEl, items, directoryWidget, inputEl);
        }
      });

      inputEl.addEventListener("blur", () => {
        setTimeout(() => {
          const list = document.getElementById(inputEl._listId);
          if (list && !list.contains(document.activeElement)) {
            hideDropdown(list);
          }
        }, 150);
      });

      inputEl.addEventListener("keydown", (e) => {
        if (e.key === "Escape") {
          hideDropdown(listEl);
          return;
        }
        if (e.key === "Enter" || e.key === "Tab") {
          const visible = listEl.querySelectorAll("li");
          if (visible.length === 1) {
            visible[0].click();
            e.preventDefault();
          } else if (visible.length > 0) {
            visible[0].click();
            e.preventDefault();
          }
          hideDropdown(listEl);
        }
      });

      const origSetValue = directoryWidget.callback
        ? directoryWidget.callback.bind(directoryWidget)
        : () => {};
      directoryWidget.callback = (value) => {
        origSetValue(value);
        inputEl._currentPrefix = value || "";
        inputEl.value = value || "";
      };

      const origOnRemoved = this.onRemoved ? this.onRemoved.bind(this) : () => {};
      this.onRemoved = () => {
        origOnRemoved();
        const list = document.getElementById(listId);
        if (list) list.remove();
      };
    };
  },
});