/* --------------------------------------------------------------------------------------------
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License. See License.txt in the project root for license information.
 * ------------------------------------------------------------------------------------------ */
'use strict';
var FullTextDocument = /** @class */ (function () {
    function FullTextDocument(uri, languageId, version, content) {
        this._uri = uri;
        this._languageId = languageId;
        this._version = version;
        this._content = content;
        this._lineOffsets = undefined;
    }
    Object.defineProperty(FullTextDocument.prototype, "uri", {
        get: function () {
            return this._uri;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(FullTextDocument.prototype, "languageId", {
        get: function () {
            return this._languageId;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(FullTextDocument.prototype, "version", {
        get: function () {
            return this._version;
        },
        enumerable: true,
        configurable: true
    });
    FullTextDocument.prototype.getText = function (range) {
        if (range) {
            var start = this.offsetAt(range.start);
            var end = this.offsetAt(range.end);
            return this._content.substring(start, end);
        }
        return this._content;
    };
    FullTextDocument.prototype.update = function (changes, version) {
        for (var _i = 0, changes_1 = changes; _i < changes_1.length; _i++) {
            var change = changes_1[_i];
            if (FullTextDocument.isIncremental(change)) {
                // makes sure start is before end
                var range = getWellformedRange(change.range);
                // update content
                var startOffset = this.offsetAt(range.start);
                var endOffset = this.offsetAt(range.end);
                this._content = this._content.substring(0, startOffset) + change.text + this._content.substring(endOffset, this._content.length);
                // update the offsets
                var startLine = Math.max(range.start.line, 0);
                var endLine = Math.max(range.end.line, 0);
                var lineOffsets = this._lineOffsets;
                var addedLineOffsets = computeLineOffsets(change.text, false, startOffset);
                if (endLine - startLine === addedLineOffsets.length) {
                    for (var i = 0, len = addedLineOffsets.length; i < len; i++) {
                        lineOffsets[i + startLine + 1] = addedLineOffsets[i];
                    }
                }
                else {
                    if (addedLineOffsets.length < 10000) {
                        lineOffsets.splice.apply(lineOffsets, [startLine + 1, endLine - startLine].concat(addedLineOffsets));
                    }
                    else { // avoid too many arguments for splice
                        this._lineOffsets = lineOffsets = lineOffsets.slice(0, startLine + 1).concat(addedLineOffsets, lineOffsets.slice(endLine + 1));
                    }
                }
                var diff = change.text.length - (endOffset - startOffset);
                if (diff !== 0) {
                    for (var i = startLine + 1 + addedLineOffsets.length, len = lineOffsets.length; i < len; i++) {
                        lineOffsets[i] = lineOffsets[i] + diff;
                    }
                }
            }
            else if (FullTextDocument.isFull(change)) {
                this._content = change.text;
                this._lineOffsets = undefined;
            }
            else {
                throw new Error('Unknown change event received');
            }
        }
        this._version = version;
    };
    FullTextDocument.prototype.getLineOffsets = function () {
        if (this._lineOffsets === undefined) {
            this._lineOffsets = computeLineOffsets(this._content, true);
        }
        return this._lineOffsets;
    };
    FullTextDocument.prototype.positionAt = function (offset) {
        offset = Math.max(Math.min(offset, this._content.length), 0);
        var lineOffsets = this.getLineOffsets();
        var low = 0, high = lineOffsets.length;
        if (high === 0) {
            return { line: 0, character: offset };
        }
        while (low < high) {
            var mid = Math.floor((low + high) / 2);
            if (lineOffsets[mid] > offset) {
                high = mid;
            }
            else {
                low = mid + 1;
            }
        }
        // low is the least x for which the line offset is larger than the current offset
        // or array.length if no line offset is larger than the current offset
        var line = low - 1;
        return { line: line, character: offset - lineOffsets[line] };
    };
    FullTextDocument.prototype.offsetAt = function (position) {
        var lineOffsets = this.getLineOffsets();
        if (position.line >= lineOffsets.length) {
            return this._content.length;
        }
        else if (position.line < 0) {
            return 0;
        }
        var lineOffset = lineOffsets[position.line];
        var nextLineOffset = (position.line + 1 < lineOffsets.length) ? lineOffsets[position.line + 1] : this._content.length;
        return Math.max(Math.min(lineOffset + position.character, nextLineOffset), lineOffset);
    };
    Object.defineProperty(FullTextDocument.prototype, "lineCount", {
        get: function () {
            return this.getLineOffsets().length;
        },
        enumerable: true,
        configurable: true
    });
    FullTextDocument.isIncremental = function (event) {
        var candidate = event;
        return candidate !== undefined && candidate !== null &&
            typeof candidate.text === 'string' && candidate.range !== undefined &&
            (candidate.rangeLength === undefined || typeof candidate.rangeLength === 'number');
    };
    FullTextDocument.isFull = function (event) {
        var candidate = event;
        return candidate !== undefined && candidate !== null &&
            typeof candidate.text === 'string' && candidate.range === undefined && candidate.rangeLength === undefined;
    };
    return FullTextDocument;
}());
export var TextDocument;
(function (TextDocument) {
    /**
     * Creates a new text document.
     *
     * @param uri The document's uri.
     * @param languageId  The document's language Id.
     * @param version The document's initial version number.
     * @param content The document's content.
     */
    function create(uri, languageId, version, content) {
        return new FullTextDocument(uri, languageId, version, content);
    }
    TextDocument.create = create;
    /**
     * Updates a TextDocument by modifing its content.
     *
     * @param document the document to update. Only documents created by TextDocument.create are valid inputs.
     * @param changes the changes to apply to the document.
     * @returns The updated TextDocument. Note: That's the same document instance passed in as first parameter.
     *
     */
    function update(document, changes, version) {
        if (document instanceof FullTextDocument) {
            document.update(changes, version);
            return document;
        }
        else {
            throw new Error('TextDocument.update: document must be created by TextDocument.create');
        }
    }
    TextDocument.update = update;
    function applyEdits(document, edits) {
        var text = document.getText();
        var sortedEdits = mergeSort(edits.map(getWellformedEdit), function (a, b) {
            var diff = a.range.start.line - b.range.start.line;
            if (diff === 0) {
                return a.range.start.character - b.range.start.character;
            }
            return diff;
        });
        var lastModifiedOffset = text.length;
        for (var i = sortedEdits.length - 1; i >= 0; i--) {
            var e = sortedEdits[i];
            var startOffset = document.offsetAt(e.range.start);
            var endOffset = document.offsetAt(e.range.end);
            if (endOffset <= lastModifiedOffset) {
                text = text.substring(0, startOffset) + e.newText + text.substring(endOffset, text.length);
            }
            else {
                throw new Error('Overlapping edit');
            }
            lastModifiedOffset = startOffset;
        }
        return text;
    }
    TextDocument.applyEdits = applyEdits;
})(TextDocument || (TextDocument = {}));
function mergeSort(data, compare) {
    if (data.length <= 1) {
        // sorted
        return data;
    }
    var p = (data.length / 2) | 0;
    var left = data.slice(0, p);
    var right = data.slice(p);
    mergeSort(left, compare);
    mergeSort(right, compare);
    var leftIdx = 0;
    var rightIdx = 0;
    var i = 0;
    while (leftIdx < left.length && rightIdx < right.length) {
        var ret = compare(left[leftIdx], right[rightIdx]);
        if (ret <= 0) {
            // smaller_equal -> take left to preserve order
            data[i++] = left[leftIdx++];
        }
        else {
            // greater -> take right
            data[i++] = right[rightIdx++];
        }
    }
    while (leftIdx < left.length) {
        data[i++] = left[leftIdx++];
    }
    while (rightIdx < right.length) {
        data[i++] = right[rightIdx++];
    }
    return data;
}
function computeLineOffsets(text, isAtLineStart, textOffset) {
    if (textOffset === void 0) { textOffset = 0; }
    var result = isAtLineStart ? [textOffset] : [];
    for (var i = 0; i < text.length; i++) {
        var ch = text.charCodeAt(i);
        if (ch === 13 /* CarriageReturn */ || ch === 10 /* LineFeed */) {
            if (ch === 13 /* CarriageReturn */ && i + 1 < text.length && text.charCodeAt(i + 1) === 10 /* LineFeed */) {
                i++;
            }
            result.push(textOffset + i + 1);
        }
    }
    return result;
}
function getWellformedRange(range) {
    var start = range.start;
    var end = range.end;
    if (start.line > end.line || (start.line === end.line && start.character > end.character)) {
        return { start: end, end: start };
    }
    return range;
}
function getWellformedEdit(textEdit) {
    var range = getWellformedRange(textEdit.range);
    if (range !== textEdit.range) {
        return { newText: textEdit.newText, range: range };
    }
    return textEdit;
}
