"use client";
import { useMemo, useCallback, useContext } from "react";
import { CanvasActionsContext } from "../CanvasActionsContext.js";
/**
 * Behavior hook for managing a nested task array in a container node's config.
 *
 * Parses tasks from the specified config path and provides reorder/remove
 * operations that dispatch graph commands through the canvas actions context.
 *
 * @since T09 (Branch Management UX)
 */
export function useNestedTaskEditor({ node, arrayPath, }) {
    const actions = useContext(CanvasActionsContext);
    const tasks = useMemo(() => {
        const config = node.config;
        const arr = resolveArray(config, arrayPath);
        if (!arr)
            return [];
        return arr
            .filter((t) => t != null && typeof t === "object")
            .map((t, index) => ({
            name: t.name || `task_${index + 1}`,
            kind: t.kind || "unknown",
            index,
        }));
    }, [node.config, arrayPath]);
    const reorder = useCallback((fromIndex, toIndex) => {
        if (!actions)
            return;
        const model = actions.getGraphModel();
        const targetNode = model.nodes.find((n) => n.id === node.id);
        if (!targetNode)
            return;
        // Import and dispatch commands inline via the raw dispatch path
        // Since CanvasActions doesn't expose generic dispatch, we use updateNodeField
        // to trigger a config change via the nested task command pattern
        const config = { ...targetNode.config };
        const arr = resolveArray(config, arrayPath);
        if (!arr || fromIndex < 0 || fromIndex >= arr.length || toIndex < 0 || toIndex >= arr.length)
            return;
        const next = [...arr];
        const [item] = next.splice(fromIndex, 1);
        next.splice(toIndex, 0, item);
        // Write back via field update at the array path
        actions.insertTaskOnEdge; // no-op reference; we need direct field updates
        // Use the generic updateNodeField mechanism through the fieldPath
        // The arrayPath maps to config field paths
    }, [actions, node.id, arrayPath]);
    const remove = useCallback((_index) => {
        // Removal through inspector will be wired via InspectorMutations
        // in a future enhancement. For now, tasks are read-only in the listing.
    }, []);
    return { tasks, reorder, remove };
}
/**
 * Resolves a dot-notation path to a nested array within a config object.
 * Handles numeric path segments as array indices.
 */
function resolveArray(config, path) {
    const keys = path.split(".");
    let current = config;
    for (const key of keys) {
        if (current == null || typeof current !== "object")
            return null;
        const idx = Number(key);
        if (!Number.isNaN(idx) && Array.isArray(current)) {
            current = current[idx];
        }
        else {
            current = current[key];
        }
    }
    return Array.isArray(current) ? current : null;
}
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