import { findWrapping, ReplaceAroundStep, canSplit, liftTarget, canJoin } from 'prosemirror-transform';
import { NodeRange, Fragment, Slice } from 'prosemirror-model';
import { Selection } from 'prosemirror-state';

const olDOM = ["ol", 0], ulDOM = ["ul", 0], liDOM = ["li", 0];
/**
An ordered list [node spec](https://prosemirror.net/docs/ref/#model.NodeSpec). Has a single
attribute, `order`, which determines the number at which the list
starts counting, and defaults to 1. Represented as an `<ol>`
element.
*/
const orderedList = {
    attrs: { order: { default: 1 } },
    parseDOM: [{ tag: "ol", getAttrs(dom) {
                return { order: dom.hasAttribute("start") ? +dom.getAttribute("start") : 1 };
            } }],
    toDOM(node) {
        return node.attrs.order == 1 ? olDOM : ["ol", { start: node.attrs.order }, 0];
    }
};
/**
A bullet list node spec, represented in the DOM as `<ul>`.
*/
const bulletList = {
    parseDOM: [{ tag: "ul" }],
    toDOM() { return ulDOM; }
};
/**
A list item (`<li>`) spec.
*/
const listItem = {
    parseDOM: [{ tag: "li" }],
    toDOM() { return liDOM; },
    defining: true
};
function add(obj, props) {
    let copy = {};
    for (let prop in obj)
        copy[prop] = obj[prop];
    for (let prop in props)
        copy[prop] = props[prop];
    return copy;
}
/**
Convenience function for adding list-related node types to a map
specifying the nodes for a schema. Adds
[`orderedList`](https://prosemirror.net/docs/ref/#schema-list.orderedList) as `"ordered_list"`,
[`bulletList`](https://prosemirror.net/docs/ref/#schema-list.bulletList) as `"bullet_list"`, and
[`listItem`](https://prosemirror.net/docs/ref/#schema-list.listItem) as `"list_item"`.

`itemContent` determines the content expression for the list items.
If you want the commands defined in this module to apply to your
list structure, it should have a shape like `"paragraph block*"` or
`"paragraph (ordered_list | bullet_list)*"`. `listGroup` can be
given to assign a group name to the list node types, for example
`"block"`.
*/
function addListNodes(nodes, itemContent, listGroup) {
    return nodes.append({
        ordered_list: add(orderedList, { content: "list_item+", group: listGroup }),
        bullet_list: add(bulletList, { content: "list_item+", group: listGroup }),
        list_item: add(listItem, { content: itemContent })
    });
}
/**
Returns a command function that wraps the selection in a list with
the given type an attributes. If `dispatch` is null, only return a
value to indicate whether this is possible, but don't actually
perform the change.
*/
function wrapInList(listType, attrs = null) {
    return function (state, dispatch) {
        let { $from, $to } = state.selection;
        let range = $from.blockRange($to), doJoin = false, outerRange = range;
        if (!range)
            return false;
        // This is at the top of an existing list item
        if (range.depth >= 2 && $from.node(range.depth - 1).type.compatibleContent(listType) && range.startIndex == 0) {
            // Don't do anything if this is the top of the list
            if ($from.index(range.depth - 1) == 0)
                return false;
            let $insert = state.doc.resolve(range.start - 2);
            outerRange = new NodeRange($insert, $insert, range.depth);
            if (range.endIndex < range.parent.childCount)
                range = new NodeRange($from, state.doc.resolve($to.end(range.depth)), range.depth);
            doJoin = true;
        }
        let wrap = findWrapping(outerRange, listType, attrs, range);
        if (!wrap)
            return false;
        if (dispatch)
            dispatch(doWrapInList(state.tr, range, wrap, doJoin, listType).scrollIntoView());
        return true;
    };
}
function doWrapInList(tr, range, wrappers, joinBefore, listType) {
    let content = Fragment.empty;
    for (let i = wrappers.length - 1; i >= 0; i--)
        content = Fragment.from(wrappers[i].type.create(wrappers[i].attrs, content));
    tr.step(new ReplaceAroundStep(range.start - (joinBefore ? 2 : 0), range.end, range.start, range.end, new Slice(content, 0, 0), wrappers.length, true));
    let found = 0;
    for (let i = 0; i < wrappers.length; i++)
        if (wrappers[i].type == listType)
            found = i + 1;
    let splitDepth = wrappers.length - found;
    let splitPos = range.start + wrappers.length - (joinBefore ? 2 : 0), parent = range.parent;
    for (let i = range.startIndex, e = range.endIndex, first = true; i < e; i++, first = false) {
        if (!first && canSplit(tr.doc, splitPos, splitDepth)) {
            tr.split(splitPos, splitDepth);
            splitPos += 2 * splitDepth;
        }
        splitPos += parent.child(i).nodeSize;
    }
    return tr;
}
/**
Build a command that splits a non-empty textblock at the top level
of a list item by also splitting that list item.
*/
function splitListItem(itemType) {
    return function (state, dispatch) {
        let { $from, $to, node } = state.selection;
        if ((node && node.isBlock) || $from.depth < 2 || !$from.sameParent($to))
            return false;
        let grandParent = $from.node(-1);
        if (grandParent.type != itemType)
            return false;
        if ($from.parent.content.size == 0 && $from.node(-1).childCount == $from.indexAfter(-1)) {
            // In an empty block. If this is a nested list, the wrapping
            // list item should be split. Otherwise, bail out and let next
            // command handle lifting.
            if ($from.depth == 3 || $from.node(-3).type != itemType ||
                $from.index(-2) != $from.node(-2).childCount - 1)
                return false;
            if (dispatch) {
                let wrap = Fragment.empty;
                let depthBefore = $from.index(-1) ? 1 : $from.index(-2) ? 2 : 3;
                // Build a fragment containing empty versions of the structure
                // from the outer list item to the parent node of the cursor
                for (let d = $from.depth - depthBefore; d >= $from.depth - 3; d--)
                    wrap = Fragment.from($from.node(d).copy(wrap));
                let depthAfter = $from.indexAfter(-1) < $from.node(-2).childCount ? 1
                    : $from.indexAfter(-2) < $from.node(-3).childCount ? 2 : 3;
                // Add a second list item with an empty default start node
                wrap = wrap.append(Fragment.from(itemType.createAndFill()));
                let start = $from.before($from.depth - (depthBefore - 1));
                let tr = state.tr.replace(start, $from.after(-depthAfter), new Slice(wrap, 4 - depthBefore, 0));
                let sel = -1;
                tr.doc.nodesBetween(start, tr.doc.content.size, (node, pos) => {
                    if (sel > -1)
                        return false;
                    if (node.isTextblock && node.content.size == 0)
                        sel = pos + 1;
                });
                if (sel > -1)
                    tr.setSelection(Selection.near(tr.doc.resolve(sel)));
                dispatch(tr.scrollIntoView());
            }
            return true;
        }
        let nextType = $to.pos == $from.end() ? grandParent.contentMatchAt(0).defaultType : null;
        let tr = state.tr.delete($from.pos, $to.pos);
        let types = nextType ? [null, { type: nextType }] : undefined;
        if (!canSplit(tr.doc, $from.pos, 2, types))
            return false;
        if (dispatch)
            dispatch(tr.split($from.pos, 2, types).scrollIntoView());
        return true;
    };
}
/**
Create a command to lift the list item around the selection up into
a wrapping list.
*/
function liftListItem(itemType) {
    return function (state, dispatch) {
        let { $from, $to } = state.selection;
        let range = $from.blockRange($to, node => node.childCount > 0 && node.firstChild.type == itemType);
        if (!range)
            return false;
        if (!dispatch)
            return true;
        if ($from.node(range.depth - 1).type == itemType) // Inside a parent list
            return liftToOuterList(state, dispatch, itemType, range);
        else // Outer list node
            return liftOutOfList(state, dispatch, range);
    };
}
function liftToOuterList(state, dispatch, itemType, range) {
    let tr = state.tr, end = range.end, endOfList = range.$to.end(range.depth);
    if (end < endOfList) {
        // There are siblings after the lifted items, which must become
        // children of the last item
        tr.step(new ReplaceAroundStep(end - 1, endOfList, end, endOfList, new Slice(Fragment.from(itemType.create(null, range.parent.copy())), 1, 0), 1, true));
        range = new NodeRange(tr.doc.resolve(range.$from.pos), tr.doc.resolve(endOfList), range.depth);
    }
    const target = liftTarget(range);
    if (target == null)
        return false;
    tr.lift(range, target);
    let after = tr.mapping.map(end, -1) - 1;
    if (canJoin(tr.doc, after))
        tr.join(after);
    dispatch(tr.scrollIntoView());
    return true;
}
function liftOutOfList(state, dispatch, range) {
    let tr = state.tr, list = range.parent;
    // Merge the list items into a single big item
    for (let pos = range.end, i = range.endIndex - 1, e = range.startIndex; i > e; i--) {
        pos -= list.child(i).nodeSize;
        tr.delete(pos - 1, pos + 1);
    }
    let $start = tr.doc.resolve(range.start), item = $start.nodeAfter;
    if (tr.mapping.map(range.end) != range.start + $start.nodeAfter.nodeSize)
        return false;
    let atStart = range.startIndex == 0, atEnd = range.endIndex == list.childCount;
    let parent = $start.node(-1), indexBefore = $start.index(-1);
    if (!parent.canReplace(indexBefore + (atStart ? 0 : 1), indexBefore + 1, item.content.append(atEnd ? Fragment.empty : Fragment.from(list))))
        return false;
    let start = $start.pos, end = start + item.nodeSize;
    // Strip off the surrounding list. At the sides where we're not at
    // the end of the list, the existing list is closed. At sides where
    // this is the end, it is overwritten to its end.
    tr.step(new ReplaceAroundStep(start - (atStart ? 1 : 0), end + (atEnd ? 1 : 0), start + 1, end - 1, new Slice((atStart ? Fragment.empty : Fragment.from(list.copy(Fragment.empty)))
        .append(atEnd ? Fragment.empty : Fragment.from(list.copy(Fragment.empty))), atStart ? 0 : 1, atEnd ? 0 : 1), atStart ? 0 : 1));
    dispatch(tr.scrollIntoView());
    return true;
}
/**
Create a command to sink the list item around the selection down
into an inner list.
*/
function sinkListItem(itemType) {
    return function (state, dispatch) {
        let { $from, $to } = state.selection;
        let range = $from.blockRange($to, node => node.childCount > 0 && node.firstChild.type == itemType);
        if (!range)
            return false;
        let startIndex = range.startIndex;
        if (startIndex == 0)
            return false;
        let parent = range.parent, nodeBefore = parent.child(startIndex - 1);
        if (nodeBefore.type != itemType)
            return false;
        if (dispatch) {
            let nestedBefore = nodeBefore.lastChild && nodeBefore.lastChild.type == parent.type;
            let inner = Fragment.from(nestedBefore ? itemType.create() : null);
            let slice = new Slice(Fragment.from(itemType.create(null, Fragment.from(parent.type.create(null, inner)))), nestedBefore ? 3 : 1, 0);
            let before = range.start, after = range.end;
            dispatch(state.tr.step(new ReplaceAroundStep(before - (nestedBefore ? 3 : 1), after, before, after, slice, 1, true))
                .scrollIntoView());
        }
        return true;
    };
}

export { addListNodes, bulletList, liftListItem, listItem, orderedList, sinkListItem, splitListItem, wrapInList };