/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
'use strict';
import { format, isEOL } from './format';
import { parseTree, findNodeAtLocation } from './parser';
export function removeProperty(text, path, options) {
    return setProperty(text, path, void 0, options);
}
export function setProperty(text, originalPath, value, options) {
    const path = originalPath.slice();
    const errors = [];
    const root = parseTree(text, errors);
    let parent = void 0;
    let lastSegment = void 0;
    while (path.length > 0) {
        lastSegment = path.pop();
        parent = findNodeAtLocation(root, path);
        if (parent === void 0 && value !== void 0) {
            if (typeof lastSegment === 'string') {
                value = { [lastSegment]: value };
            }
            else {
                value = [value];
            }
        }
        else {
            break;
        }
    }
    if (!parent) {
        // empty document
        if (value === void 0) { // delete
            throw new Error('Can not delete in empty document');
        }
        return withFormatting(text, { offset: root ? root.offset : 0, length: root ? root.length : 0, content: JSON.stringify(value) }, options);
    }
    else if (parent.type === 'object' && typeof lastSegment === 'string' && Array.isArray(parent.children)) {
        const existing = findNodeAtLocation(parent, [lastSegment]);
        if (existing !== void 0) {
            if (value === void 0) { // delete
                if (!existing.parent) {
                    throw new Error('Malformed AST');
                }
                const propertyIndex = parent.children.indexOf(existing.parent);
                let removeBegin;
                let removeEnd = existing.parent.offset + existing.parent.length;
                if (propertyIndex > 0) {
                    // remove the comma of the previous node
                    let previous = parent.children[propertyIndex - 1];
                    removeBegin = previous.offset + previous.length;
                }
                else {
                    removeBegin = parent.offset + 1;
                    if (parent.children.length > 1) {
                        // remove the comma of the next node
                        let next = parent.children[1];
                        removeEnd = next.offset;
                    }
                }
                return withFormatting(text, { offset: removeBegin, length: removeEnd - removeBegin, content: '' }, options);
            }
            else {
                // set value of existing property
                return withFormatting(text, { offset: existing.offset, length: existing.length, content: JSON.stringify(value) }, options);
            }
        }
        else {
            if (value === void 0) { // delete
                return []; // property does not exist, nothing to do
            }
            const newProperty = `${JSON.stringify(lastSegment)}: ${JSON.stringify(value)}`;
            const index = options.getInsertionIndex ? options.getInsertionIndex(parent.children.map(p => p.children[0].value)) : parent.children.length;
            let edit;
            if (index > 0) {
                let previous = parent.children[index - 1];
                edit = { offset: previous.offset + previous.length, length: 0, content: ',' + newProperty };
            }
            else if (parent.children.length === 0) {
                edit = { offset: parent.offset + 1, length: 0, content: newProperty };
            }
            else {
                edit = { offset: parent.offset + 1, length: 0, content: newProperty + ',' };
            }
            return withFormatting(text, edit, options);
        }
    }
    else if (parent.type === 'array' && typeof lastSegment === 'number' && Array.isArray(parent.children)) {
        const insertIndex = lastSegment;
        if (insertIndex === -1) {
            // Insert
            const newProperty = `${JSON.stringify(value)}`;
            let edit;
            if (parent.children.length === 0) {
                edit = { offset: parent.offset + 1, length: 0, content: newProperty };
            }
            else {
                const previous = parent.children[parent.children.length - 1];
                edit = { offset: previous.offset + previous.length, length: 0, content: ',' + newProperty };
            }
            return withFormatting(text, edit, options);
        }
        else if (value === void 0 && parent.children.length >= 0) {
            // Removal
            const removalIndex = lastSegment;
            const toRemove = parent.children[removalIndex];
            let edit;
            if (parent.children.length === 1) {
                // only item
                edit = { offset: parent.offset + 1, length: parent.length - 2, content: '' };
            }
            else if (parent.children.length - 1 === removalIndex) {
                // last item
                let previous = parent.children[removalIndex - 1];
                let offset = previous.offset + previous.length;
                let parentEndOffset = parent.offset + parent.length;
                edit = { offset, length: parentEndOffset - 2 - offset, content: '' };
            }
            else {
                edit = { offset: toRemove.offset, length: parent.children[removalIndex + 1].offset - toRemove.offset, content: '' };
            }
            return withFormatting(text, edit, options);
        }
        else if (value !== void 0) {
            let edit;
            const newProperty = `${JSON.stringify(value)}`;
            if (!options.isArrayInsertion && parent.children.length > lastSegment) {
                const toModify = parent.children[lastSegment];
                edit = { offset: toModify.offset, length: toModify.length, content: newProperty };
            }
            else if (parent.children.length === 0 || lastSegment === 0) {
                edit = { offset: parent.offset + 1, length: 0, content: parent.children.length === 0 ? newProperty : newProperty + ',' };
            }
            else {
                const index = lastSegment > parent.children.length ? parent.children.length : lastSegment;
                const previous = parent.children[index - 1];
                edit = { offset: previous.offset + previous.length, length: 0, content: ',' + newProperty };
            }
            return withFormatting(text, edit, options);
        }
        else {
            throw new Error(`Can not ${value === void 0 ? 'remove' : (options.isArrayInsertion ? 'insert' : 'modify')} Array index ${insertIndex} as length is not sufficient`);
        }
    }
    else {
        throw new Error(`Can not add ${typeof lastSegment !== 'number' ? 'index' : 'property'} to parent of type ${parent.type}`);
    }
}
function withFormatting(text, edit, options) {
    if (!options.formattingOptions) {
        return [edit];
    }
    // apply the edit
    let newText = applyEdit(text, edit);
    // format the new text
    let begin = edit.offset;
    let end = edit.offset + edit.content.length;
    if (edit.length === 0 || edit.content.length === 0) { // insert or remove
        while (begin > 0 && !isEOL(newText, begin - 1)) {
            begin--;
        }
        while (end < newText.length && !isEOL(newText, end)) {
            end++;
        }
    }
    const edits = format(newText, { offset: begin, length: end - begin }, { ...options.formattingOptions, keepLines: false });
    // apply the formatting edits and track the begin and end offsets of the changes
    for (let i = edits.length - 1; i >= 0; i--) {
        const edit = edits[i];
        newText = applyEdit(newText, edit);
        begin = Math.min(begin, edit.offset);
        end = Math.max(end, edit.offset + edit.length);
        end += edit.content.length - edit.length;
    }
    // create a single edit with all changes
    const editLength = text.length - (newText.length - end) - begin;
    return [{ offset: begin, length: editLength, content: newText.substring(begin, end) }];
}
export function applyEdit(text, edit) {
    return text.substring(0, edit.offset) + edit.content + text.substring(edit.offset + edit.length);
}
export function isWS(text, offset) {
    return '\r\n \t'.indexOf(text.charAt(offset)) !== -1;
}