/// <reference path="..\..\..\src\harness\harness.ts" />
/// <reference path="..\..\..\src\server\editorServices.ts" />

module ts {
    function editFlat(position: number, deletedLength: number, newText: string, source: string) {
        return source.substring(0, position) + newText + source.substring(position + deletedLength, source.length);
    }

    function lineColToPosition(lineIndex: server.LineIndex, line: number, col: number) {
        var lineInfo = lineIndex.lineNumberToInfo(line);
        return (lineInfo.offset + col - 1);
    }

    function validateEdit(lineIndex: server.LineIndex, sourceText: string, position: number, deleteLength: number, insertString: string): void {
        let checkText = editFlat(position, deleteLength, insertString, sourceText);
        let snapshot = lineIndex.edit(position, deleteLength, insertString);
        let editedText = snapshot.getText(0, snapshot.getLength());

        assert.equal(editedText, checkText);
    }

    describe('VersionCache TS code', () => {
        var testContent = `/// <reference path="z.ts" />
var x = 10;
var y = { zebra: 12, giraffe: "ell" };
z.a;
class Point {
    x: number;
}
k=y;
var p:Point=new Point();
var q:Point=<Point>p;`

        let {lines, lineMap} = server.LineIndex.linesFromText(testContent);
        assert.isTrue(lines.length > 0, "Failed to initialize test text. Expected text to have at least one line");

        let lineIndex = new server.LineIndex();
        lineIndex.load(lines);

        function validateEditAtLineCharIndex(line: number, char: number, deleteLength: number, insertString: string): void {
            let position = lineColToPosition(lineIndex, line, char);
            validateEdit(lineIndex, testContent, position, deleteLength, insertString);
        }

        it('change 9 1 0 1 {"y"}', () => {
            validateEditAtLineCharIndex(9, 1, 0, "y");
        });

        it('change 9 2 0 1 {"."}', () => {
            validateEditAtLineCharIndex(9, 2, 0, ".");
        });

        it('change 9 3 0 1 {"\\n"}', () => {
            validateEditAtLineCharIndex(9, 3, 0, "\n");
        });

        it('change 10 1 0 10 {"\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n"}', () => {
            validateEditAtLineCharIndex(10, 1, 0, "\n\n\n\n\n\n\n\n\n\n");
        });

        it('change 19 1 1 0', () => {
            validateEditAtLineCharIndex(19, 1, 1, "");
        });

        it('change 18 1 1 0', () => {
            validateEditAtLineCharIndex(18, 1, 1, "");
        });
    });

    describe('VersionCache simple text', () => {
        let testContent = `in this story:
the lazy brown fox
jumped over the cow
that ate the grass
that was purple at the tips
and grew 1cm per day`;

        let {lines, lineMap} = server.LineIndex.linesFromText(testContent);
        assert.isTrue(lines.length > 0, "Failed to initialize test text. Expected text to have at least one line");

        let lineIndex = new server.LineIndex();
        lineIndex.load(lines);

        function validateEditAtPosition(position: number, deleteLength: number, insertString: string): void {
            validateEdit(lineIndex, testContent, position, deleteLength, insertString);
        }

        it('Insert at end of file', () => {
            validateEditAtPosition(testContent.length, 0, "hmmmm...\r\n");
        });

        it('Unusual line endings merge', () => {
            validateEditAtPosition(lines[0].length - 1, lines[1].length, "");
        });

        it('Delete whole line and nothing but line (last line)', () => {
            validateEditAtPosition(lineMap[lineMap.length - 2], lines[lines.length - 1].length, "");
        });

        it('Delete whole line and nothing but line (first line)', () => {
            validateEditAtPosition(0, lines[0].length, "");
        });

        it('Delete whole line (first line) and insert with no line breaks', () => {
            validateEditAtPosition(0, lines[0].length, "moo, moo, moo! ");
        });

        it('Delete whole line (first line) and insert with multiple line breaks', () => {
            validateEditAtPosition(0, lines[0].length, "moo, \r\nmoo, \r\nmoo! ");
        });

        it('Delete multiple lines and nothing but lines (first and second lines)', () => {
            validateEditAtPosition(0, lines[0].length + lines[1].length, "");
        });

        it('Delete multiple lines and nothing but lines (second and third lines)', () => {
            validateEditAtPosition(lines[0].length, lines[1].length + lines[2].length, "");
        });

        it('Insert multiple line breaks', () => {
            validateEditAtPosition(21, 1, "cr...\r\ncr...\r\ncr...\r\ncr...\r\ncr...\r\ncr...\r\ncr...\r\ncr...\r\ncr...\r\ncr...\r\ncr...\r\ncr");
        });

        it('Insert multiple line breaks', () => {
            validateEditAtPosition(21, 1, "cr...\r\ncr...\r\ncr");
        });

        it('Insert multiple line breaks with leading \\n', () => {
            validateEditAtPosition(21, 1, "\ncr...\r\ncr...\r\ncr");
        });

        it('Single line no line breaks deleted or inserted, delete 1 char', () => {
            validateEditAtPosition(21, 1, "");
        });

        it('Single line no line breaks deleted or inserted, insert 1 char', () => {
            validateEditAtPosition(21, 0, "b");
        });

        it('Single line no line breaks deleted or inserted, delete 1, insert 2 chars', () => {
            validateEditAtPosition(21, 1, "cr");
        });

        it('Delete across line break (just the line break)', () => {
            validateEditAtPosition(21, 22, "");
        });

        it('Delete across line break', () => {
            validateEditAtPosition(21, 32, "");
        });

        it('Delete across multiple line breaks and insert no line breaks', () => {
            validateEditAtPosition(21, 42, "");
        });

        it('Delete across multiple line breaks and insert text', () => {
            validateEditAtPosition(21, 42, "slithery ");
        });
    });

    describe('VersionCache stress test', () => {
        const iterationCount = 20;
        //const interationCount = 20000; // uncomment for testing

        // Use scanner.ts, decent size, does not change frequentlly
        let testFileName = "src/compiler/scanner.ts";
        let testContent = Harness.IO.readFile(testFileName);
        let totalChars = testContent.length;
        assert.isTrue(totalChars > 0, "Failed to read test file.");

        let {lines, lineMap} = server.LineIndex.linesFromText(testContent);
        assert.isTrue(lines.length > 0, "Failed to initialize test text. Expected text to have at least one line");

        let lineIndex = new server.LineIndex();
        lineIndex.load(lines);

        let rsa: number[] = [];
        let la: number[] = [];
        let las: number[] = [];
        let elas: number[] = [];
        let ersa: number[] = [];
        let ela: number[] = [];
        let etotalChars = totalChars;

        for (let j = 0; j < 100000; j++) {
            rsa[j] = Math.floor(Math.random() * totalChars);
            la[j] = Math.floor(Math.random() * (totalChars - rsa[j]));
            if (la[j] > 4) {
                las[j] = 4;
            }
            else {
                las[j] = la[j];
            }
            if (j < 4000) {
                ersa[j] = Math.floor(Math.random() * etotalChars);
                ela[j] = Math.floor(Math.random() * (etotalChars - ersa[j]));
                if (ela[j] > 4) {
                    elas[j] = 4;
                }
                else {
                    elas[j] = ela[j];
                }
                etotalChars += (las[j] - elas[j]);
            }
        }

        it("Range (average length 1/4 file size)", () => {
            for (let i = 0; i < iterationCount; i++) {
                let s2 = lineIndex.getText(rsa[i], la[i]);
                let s1 = testContent.substring(rsa[i], rsa[i] + la[i]);
                assert.equal(s1, s2);
            }
        });

        it("Range (average length 4 chars)", () => {
            for (let j = 0; j < iterationCount; j++) {
                let s2 = lineIndex.getText(rsa[j], las[j]);
                let s1 = testContent.substring(rsa[j], rsa[j] + las[j]);
                assert.equal(s1, s2);
            }
        });

        it("Edit (average length 4)", () => {
            for (let i = 0; i < iterationCount; i++) {
                let insertString = testContent.substring(rsa[100000 - i], rsa[100000 - i] + las[100000 - i]);
                let snapshot = lineIndex.edit(rsa[i], las[i], insertString);
                let checkText = editFlat(rsa[i], las[i], insertString, testContent);
                let snapText = snapshot.getText(0, checkText.length);
                assert.equal(checkText, snapText);
            }
        });

        it("Edit ScriptVersionCache ", () => {
            let svc = server.ScriptVersionCache.fromString(ts.sys, testContent);
            let checkText = testContent;

            for (let i = 0; i < iterationCount; i++) {
                let insertString = testContent.substring(rsa[i], rsa[i] + las[i]);
                svc.edit(ersa[i], elas[i], insertString);
                checkText = editFlat(ersa[i], elas[i], insertString, checkText);
                if (0 == (i % 4)) {
                    let snap = svc.getSnapshot();
                    let snapText = snap.getText(0, checkText.length);
                    assert.equal(checkText, snapText);
                }
            }
        });

        it("Edit (average length 1/4th file size)", () => {
            for (let i = 0; i < iterationCount; i++) {
                let insertString = testContent.substring(rsa[100000 - i], rsa[100000 - i] + la[100000 - i]);
                let snapshot = lineIndex.edit(rsa[i], la[i], insertString);
                let checkText = editFlat(rsa[i], la[i], insertString, testContent);
                let snapText = snapshot.getText(0, checkText.length);
                assert.equal(checkText, snapText);
            }
        });

        it("Line/offset from pos", () => {
            for (let i = 0; i < iterationCount; i++) {
                let lp = lineIndex.charOffsetToLineNumberAndPos(rsa[i]);
                let lac = ts.computeLineAndCharacterOfPosition(lineMap, rsa[i]);
                assert.equal(lac.line + 1, lp.line, "Line number mismatch " + (lac.line + 1) + " " + lp.line + " " + i);
                assert.equal(lac.character, (lp.offset), "Charachter offset mismatch " + lac.character + " " + lp.offset + " " + i);
            }
        });

        it("Start pos from line", () => {
            for (let i = 0; i < iterationCount; i++) {
                for (let j = 0, llen = lines.length; j < llen; j++) {
                    let lineInfo = lineIndex.lineNumberToInfo(j + 1);
                    let lineIndexOffset = lineInfo.offset;
                    let lineMapOffset = lineMap[j];
                    assert.equal(lineIndexOffset, lineMapOffset);
                }
            }
        });
    });
}