# All files / src/components/editable useEditableField.ts

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     import { useCallback, useEffect, useRef, useState } from "react";

    /** Options for the useEditableField hook. */
    export interface UseEditableFieldOptions {
      /** Current persisted value. */
      value: string;
      /** Called when the user saves a new value. */
      onSave: (value: string) => void;
      /** Optional validation — return an error string, or undefined if valid. */
      validate?: (value: string) => string | undefined;
      /** Unique identifier for this field (used for coordination). */
      fieldId: string;
      /** Which field is currently being edited (coordination from parent). */
      activeFieldId?: string | null; // eslint-disable-line @rushstack/no-new-null
      /** Callback to tell the parent which field is active. */
      onActivate?: (fieldId: string | null) => void; // eslint-disable-line @rushstack/no-new-null
      /** Whether Enter key triggers save (true for text inputs, false for textarea). */
      enterToSave?: boolean;
      /** Whether to trim whitespace before saving. Default true. */
      trimOnSave?: boolean;
    }

    /** Return type for the useEditableField hook. */
    export interface UseEditableFieldReturn {
      /** Whether this field is currently in edit mode. */
      isEditing: boolean;
      /** The current draft value while editing. */
      draft: string;
      /** Validation error message, or empty string. */
      error: string;
      /** Whether the draft differs from the persisted value. */
      isDirty: boolean;
      /** Enter edit mode with the current value as the draft. */
      startEdit: () => void;
      /** Exit edit mode without saving. */
      cancelEdit: () => void;
      /** Validate and save the current draft. */
      save: () => void;
      /** Update the draft value. Also clears any validation error. */
      setDraft: (value: string) => void;
      /** Clear the validation error. */
      clearError: () => void;
      /** Blur handler that auto-saves, respecting ignoreInitialBlur and data-edit-action. */
      handleBlur: (event: React.FocusEvent) => void;
      /** Keyboard handler for Escape (cancel) and optionally Enter (save). */
      handleKeyDown: (event: React.KeyboardEvent) => void;
      /**
       * Ref that prevents the initial blur (caused by clicking the edit button)
       * from triggering a save. Set to true when startEdit is called, reset on
       * first blur.
       */
      ignoreInitialBlurRef: React.RefObject<boolean>;
    }

    /**
     * Shared hook that encapsulates the click-to-edit state machine used by
     * EditableTextField, EditableTextArea, and EditableSelect.
     */
    export function useEditableField(options: UseEditableFieldOptions): UseEditableFieldReturn {
      const {
        value,
        onSave,
        validate,
        fieldId,
        activeFieldId,
        onActivate,
        enterToSave = true,
        trimOnSave = true,
      } = options;

      const [draft, setDraftRaw] = useState("");
      const [error, setError] = useState("");
      const ignoreInitialBlurRef = useRef<boolean>(false);

      const isEditing = activeFieldId === fieldId;

      const setDraft = useCallback((v: string) => {
        setDraftRaw(v);
        setError("");
      }, []);

      const clearError = useCallback(() => {
        setError("");
      }, []);

      const cancelEdit = useCallback(() => {
        ignoreInitialBlurRef.current = false;
        onActivate?.(null);
        setDraftRaw("");
        setError("");
      }, [onActivate]);

      const save = useCallback(() => {
        const saveValue = trimOnSave ? draft.trim() : draft;

        Iif (validate) {
          const validationError = validate(draft);
          Iif (validationError) {
            setError(validationError);
            return;
          }
        }

        // No-op when value hasn't changed
        const compareValue = trimOnSave ? value.trim() : value;
        Iif (saveValue === compareValue) {
          cancelEdit();
          return;
        }

        onSave(saveValue);
        cancelEdit();
      }, [draft, value, trimOnSave, validate, onSave, cancelEdit]);

      const startEdit = useCallback(() => {
        ignoreInitialBlurRef.current = true;
        onActivate?.(fieldId);
        setDraftRaw(value);
        setError("");
      }, [fieldId, value, onActivate]);

      const handleBlur = useCallback(
        (event: React.FocusEvent) => {
          Iif (ignoreInitialBlurRef.current) {
            ignoreInitialBlurRef.current = false;
            return;
          }
          Iif (
            event.relatedTarget instanceof HTMLElement &&
            event.relatedTarget.dataset.editAction === fieldId
          ) {
            return;
          }
          save();
        },
        [fieldId, save],
      );

      const handleKeyDown = useCallback(
        (event: React.KeyboardEvent) => {
          if (event.key === "Escape") {
            cancelEdit();
          I} else if (event.key === "Enter" && enterToSave) {
            save();
          }
        },
        [cancelEdit, enterToSave, save],
      );

      const isDirty = (() => {
        if (!isEditing) return false;
        const compareValue = trimOnSave ? value.trim() : value;
        const draftValue = trimOnSave ? draft.trim() : draft;
        return draftValue !== compareValue;
      })();

      // If another field becomes active, reset our local state
      useEffect(() => {
        Iif (!isEditing && (draft !== "" || error !== "")) {
          setDraftRaw("");
          setError("");
        }
      }, [isEditing, draft, error]);

      return {
        isEditing,
        draft,
        error,
        isDirty,
        startEdit,
        cancelEdit,
        save,
        setDraft,
        clearError,
        handleBlur,
        handleKeyDown,
        ignoreInitialBlurRef,
      };
    }