/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import * as Platform from '../../core/platform/platform.js';

export interface SerializedTextRange {
  startLine: number;
  startColumn: number;
  endLine: number;
  endColumn: number;
}

export class TextRange {
  constructor(public startLine: number, public startColumn: number, public endLine: number, public endColumn: number) {
  }

  static createFromLocation(line: number, column: number): TextRange {
    return new TextRange(line, column, line, column);
  }

  static fromObject(serializedTextRange: SerializedTextRange): TextRange {
    return new TextRange(
        serializedTextRange.startLine, serializedTextRange.startColumn, serializedTextRange.endLine,
        serializedTextRange.endColumn);
  }

  static comparator(range1: TextRange, range2: TextRange): number {
    return range1.compareTo(range2);
  }

  static fromEdit(oldRange: TextRange, newText: string): TextRange {
    let endLine: number = oldRange.startLine;
    let endColumn: number = oldRange.startColumn + newText.length;

    const lineEndings = Platform.StringUtilities.findLineEndingIndexes(newText);
    if (lineEndings.length > 1) {
      endLine = oldRange.startLine + lineEndings.length - 1;
      const len = lineEndings.length;
      endColumn = lineEndings[len - 1] - lineEndings[len - 2] - 1;
    }
    return new TextRange(oldRange.startLine, oldRange.startColumn, endLine, endColumn);
  }

  isEmpty(): boolean {
    return this.startLine === this.endLine && this.startColumn === this.endColumn;
  }

  immediatelyPrecedes(range?: TextRange): boolean {
    if (!range) {
      return false;
    }
    return this.endLine === range.startLine && this.endColumn === range.startColumn;
  }

  immediatelyFollows(range?: TextRange): boolean {
    if (!range) {
      return false;
    }
    return range.immediatelyPrecedes(this);
  }

  follows(range: TextRange): boolean {
    return (range.endLine === this.startLine && range.endColumn <= this.startColumn) || range.endLine < this.startLine;
  }

  get linesCount(): number {
    return this.endLine - this.startLine;
  }

  collapseToEnd(): TextRange {
    return new TextRange(this.endLine, this.endColumn, this.endLine, this.endColumn);
  }

  collapseToStart(): TextRange {
    return new TextRange(this.startLine, this.startColumn, this.startLine, this.startColumn);
  }

  normalize(): TextRange {
    if (this.startLine > this.endLine || (this.startLine === this.endLine && this.startColumn > this.endColumn)) {
      return new TextRange(this.endLine, this.endColumn, this.startLine, this.startColumn);
    }
    return this.clone();
  }

  clone(): TextRange {
    return new TextRange(this.startLine, this.startColumn, this.endLine, this.endColumn);
  }

  serializeToObject(): {
    startLine: number,
    startColumn: number,
    endLine: number,
    endColumn: number,
  } {
    return {
      startLine: this.startLine,
      startColumn: this.startColumn,
      endLine: this.endLine,
      endColumn: this.endColumn,
    };
  }

  compareTo(other: TextRange): number {
    if (this.startLine > other.startLine) {
      return 1;
    }
    if (this.startLine < other.startLine) {
      return -1;
    }
    if (this.startColumn > other.startColumn) {
      return 1;
    }
    if (this.startColumn < other.startColumn) {
      return -1;
    }
    return 0;
  }

  compareToPosition(lineNumber: number, columnNumber: number): number {
    if (lineNumber < this.startLine || (lineNumber === this.startLine && columnNumber < this.startColumn)) {
      return -1;
    }
    if (lineNumber > this.endLine || (lineNumber === this.endLine && columnNumber > this.endColumn)) {
      return 1;
    }
    return 0;
  }

  equal(other: TextRange): boolean {
    return this.startLine === other.startLine && this.endLine === other.endLine &&
        this.startColumn === other.startColumn && this.endColumn === other.endColumn;
  }

  relativeTo(line: number, column: number): TextRange {
    const relative = this.clone();

    if (this.startLine === line) {
      relative.startColumn -= column;
    }
    if (this.endLine === line) {
      relative.endColumn -= column;
    }

    relative.startLine -= line;
    relative.endLine -= line;
    return relative;
  }

  relativeFrom(line: number, column: number): TextRange {
    const relative = this.clone();

    if (this.startLine === 0) {
      relative.startColumn += column;
    }
    if (this.endLine === 0) {
      relative.endColumn += column;
    }

    relative.startLine += line;
    relative.endLine += line;
    return relative;
  }

  rebaseAfterTextEdit(originalRange: TextRange, editedRange: TextRange): TextRange {
    console.assert(originalRange.startLine === editedRange.startLine);
    console.assert(originalRange.startColumn === editedRange.startColumn);
    const rebase = this.clone();
    if (!this.follows(originalRange)) {
      return rebase;
    }
    const lineDelta = editedRange.endLine - originalRange.endLine;
    const columnDelta = editedRange.endColumn - originalRange.endColumn;
    rebase.startLine += lineDelta;
    rebase.endLine += lineDelta;
    if (rebase.startLine === editedRange.endLine) {
      rebase.startColumn += columnDelta;
    }
    if (rebase.endLine === editedRange.endLine) {
      rebase.endColumn += columnDelta;
    }
    return rebase;
  }

  toString(): string {
    return JSON.stringify(this);
  }

  containsLocation(lineNumber: number, columnNumber: number): boolean {
    if (this.startLine === this.endLine) {
      return this.startLine === lineNumber && this.startColumn <= columnNumber && columnNumber <= this.endColumn;
    }
    if (this.startLine === lineNumber) {
      return this.startColumn <= columnNumber;
    }
    if (this.endLine === lineNumber) {
      return columnNumber <= this.endColumn;
    }
    return this.startLine < lineNumber && lineNumber < this.endLine;
  }
}

export class SourceRange {
  constructor(public offset: number, public length: number) {
  }
}