/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * This object contains the cache of the various row heights that are present inside
 * the data table.   Its based on Fenwick tree data structure that helps with
 * querying sums that have time complexity of log n.
 *
 * Fenwick Tree Credits: http://petr-mitrichev.blogspot.com/2013/05/fenwick-tree-range-updates.html
 * https://github.com/mikolalysenko/fenwick-tree
 *
 */
export class RowHeightCache {
    constructor() {
        /**
         * Tree Array stores the cumulative information of the row heights to perform efficient
         * range queries and updates.  Currently the tree is initialized to the base row
         * height instead of the detail row height.
         */
        this.treeArray = [];
    }
    /**
     * Clear the Tree array.
     * @return {?}
     */
    clearCache() {
        this.treeArray = [];
    }
    /**
     * Initialize the Fenwick tree with row Heights.
     *
     * @param {?} details
     * @return {?}
     */
    initCache(details) {
        const { rows, rowHeight, detailRowHeight, externalVirtual, rowCount, rowIndexes, rowExpansions } = details;
        /** @type {?} */
        const isFn = typeof rowHeight === 'function';
        /** @type {?} */
        const isDetailFn = typeof detailRowHeight === 'function';
        if (!isFn && isNaN(rowHeight)) {
            throw new Error(`Row Height cache initialization failed. Please ensure that 'rowHeight' is a
        valid number or function value: (${rowHeight}) when 'scrollbarV' is enabled.`);
        }
        // Add this additional guard in case detailRowHeight is set to 'auto' as it wont work.
        if (!isDetailFn && isNaN(detailRowHeight)) {
            throw new Error(`Row Height cache initialization failed. Please ensure that 'detailRowHeight' is a
        valid number or function value: (${detailRowHeight}) when 'scrollbarV' is enabled.`);
        }
        /** @type {?} */
        const n = externalVirtual ? rowCount : rows.length;
        this.treeArray = new Array(n);
        for (let i = 0; i < n; ++i) {
            this.treeArray[i] = 0;
        }
        for (let i = 0; i < n; ++i) {
            /** @type {?} */
            const row = rows[i];
            /** @type {?} */
            let currentRowHeight = rowHeight;
            if (isFn) {
                currentRowHeight = rowHeight(row);
            }
            // Add the detail row height to the already expanded rows.
            // This is useful for the table that goes through a filter or sort.
            /** @type {?} */
            const expanded = rowExpansions.has(row);
            if (row && expanded) {
                if (isDetailFn) {
                    /** @type {?} */
                    const index = rowIndexes.get(row);
                    currentRowHeight += detailRowHeight(row, index);
                }
                else {
                    currentRowHeight += detailRowHeight;
                }
            }
            this.update(i, currentRowHeight);
        }
    }
    /**
     * Given the ScrollY position i.e. sum, provide the rowIndex
     * that is present in the current view port.  Below handles edge cases.
     * @param {?} scrollY
     * @return {?}
     */
    getRowIndex(scrollY) {
        if (scrollY === 0)
            return 0;
        return this.calcRowIndex(scrollY);
    }
    /**
     * When a row is expanded or rowHeight is changed, update the height.  This can
     * be utilized in future when Angular Data table supports dynamic row heights.
     * @param {?} atRowIndex
     * @param {?} byRowHeight
     * @return {?}
     */
    update(atRowIndex, byRowHeight) {
        if (!this.treeArray.length) {
            throw new Error(`Update at index ${atRowIndex} with value ${byRowHeight} failed:
        Row Height cache not initialized.`);
        }
        /** @type {?} */
        const n = this.treeArray.length;
        atRowIndex |= 0;
        while (atRowIndex < n) {
            this.treeArray[atRowIndex] += byRowHeight;
            atRowIndex |= atRowIndex + 1;
        }
    }
    /**
     * Range Sum query from 1 to the rowIndex
     * @param {?} atIndex
     * @return {?}
     */
    query(atIndex) {
        if (!this.treeArray.length) {
            throw new Error(`query at index ${atIndex} failed: Fenwick tree array not initialized.`);
        }
        /** @type {?} */
        let sum = 0;
        atIndex |= 0;
        while (atIndex >= 0) {
            sum += this.treeArray[atIndex];
            atIndex = (atIndex & (atIndex + 1)) - 1;
        }
        return sum;
    }
    /**
     * Find the total height between 2 row indexes
     * @param {?} atIndexA
     * @param {?} atIndexB
     * @return {?}
     */
    queryBetween(atIndexA, atIndexB) {
        return this.query(atIndexB) - this.query(atIndexA - 1);
    }
    /**
     * Given the ScrollY position i.e. sum, provide the rowIndex
     * that is present in the current view port.
     * @private
     * @param {?} sum
     * @return {?}
     */
    calcRowIndex(sum) {
        if (!this.treeArray.length)
            return 0;
        /** @type {?} */
        let pos = -1;
        /** @type {?} */
        const dataLength = this.treeArray.length;
        // Get the highest bit for the block size.
        /** @type {?} */
        const highestBit = Math.pow(2, dataLength.toString(2).length - 1);
        for (let blockSize = highestBit; blockSize !== 0; blockSize >>= 1) {
            /** @type {?} */
            const nextPos = pos + blockSize;
            if (nextPos < dataLength && sum >= this.treeArray[nextPos]) {
                sum -= this.treeArray[nextPos];
                pos = nextPos;
            }
        }
        return pos + 1;
    }
}
if (false) {
    /**
     * Tree Array stores the cumulative information of the row heights to perform efficient
     * range queries and updates.  Currently the tree is initialized to the base row
     * height instead of the detail row height.
     * @type {?}
     * @private
     */
    RowHeightCache.prototype.treeArray;
}
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Its based on Fenwick tree data structure that helps with\n * querying sums that have time complexity of log n.\n *\n * Fenwick Tree Credits: http://petr-mitrichev.blogspot.com/2013/05/fenwick-tree-range-updates.html\n * https://github.com/mikolalysenko/fenwick-tree\n *\n */\nexport class RowHeightCache {\n  /**\n   * Tree Array stores the cumulative information of the row heights to perform efficient\n   * range queries and updates.  Currently the tree is initialized to the base row\n   * height instead of the detail row height.\n   */\n  private treeArray: number[] = [];\n\n  /**\n   * Clear the Tree array.\n   */\n  clearCache(): void {\n    this.treeArray = [];\n  }\n\n  /**\n   * Initialize the Fenwick tree with row Heights.\n   *\n   * @param rows The array of rows which contain the expanded status.\n   * @param rowHeight The row height.\n   * @param detailRowHeight The detail row height.\n   */\n  initCache(details: any): void {\n    const { rows, rowHeight, detailRowHeight, externalVirtual, rowCount, rowIndexes, rowExpansions } = details;\n    const isFn = typeof rowHeight === 'function';\n    const isDetailFn = typeof detailRowHeight === 'function';\n\n    if (!isFn && isNaN(rowHeight)) {\n      throw new Error(`Row Height cache initialization failed. Please ensure that 'rowHeight' is a\n        valid number or function value: (${rowHeight}) when 'scrollbarV' is enabled.`);\n    }\n\n    // Add this additional guard in case detailRowHeight is set to 'auto' as it wont work.\n    if (!isDetailFn && isNaN(detailRowHeight)) {\n      throw new Error(`Row Height cache initialization failed. Please ensure that 'detailRowHeight' is a\n        valid number or function value: (${detailRowHeight}) when 'scrollbarV' is enabled.`);\n    }\n\n    const n = externalVirtual ? rowCount : rows.length;\n    this.treeArray = new Array(n);\n\n    for (let i = 0; i < n; ++i) {\n      this.treeArray[i] = 0;\n    }\n\n    for (let i = 0; i < n; ++i) {\n      const row = rows[i];\n      let currentRowHeight = rowHeight;\n      if (isFn) {\n        currentRowHeight = rowHeight(row);\n      }\n\n      // Add the detail row height to the already expanded rows.\n      // This is useful for the table that goes through a filter or sort.\n      const expanded = rowExpansions.has(row);\n      if (row && expanded) {\n        if (isDetailFn) {\n          const index = rowIndexes.get(row);\n          currentRowHeight += detailRowHeight(row, index);\n        } else {\n          currentRowHeight += detailRowHeight;\n        }\n      }\n\n      this.update(i, currentRowHeight);\n    }\n  }\n\n  /**\n   * Given the ScrollY position i.e. sum, provide the rowIndex\n   * that is present in the current view port.  Below handles edge cases.\n   */\n  getRowIndex(scrollY: number): number {\n    if (scrollY === 0) return 0;\n    return this.calcRowIndex(scrollY);\n  }\n\n  /**\n   * When a row is expanded or rowHeight is changed, update the height.  This can\n   * be utilized in future when Angular Data table supports dynamic row heights.\n   */\n  update(atRowIndex: number, byRowHeight: number): void {\n    if (!this.treeArray.length) {\n      throw new Error(`Update at index ${atRowIndex} with value ${byRowHeight} failed:\n        Row Height cache not initialized.`);\n    }\n\n    const n = this.treeArray.length;\n    atRowIndex |= 0;\n\n    while (atRowIndex < n) {\n      this.treeArray[atRowIndex] += byRowHeight;\n      atRowIndex |= atRowIndex + 1;\n    }\n  }\n\n  /**\n   * Range Sum query from 1 to the rowIndex\n   */\n  query(atIndex: number): number {\n    if (!this.treeArray.length) {\n      throw new Error(`query at index ${atIndex} failed: Fenwick tree array not initialized.`);\n    }\n\n    let sum = 0;\n    atIndex |= 0;\n\n    while (atIndex >= 0) {\n      sum += this.treeArray[atIndex];\n      atIndex = (atIndex & (atIndex + 1)) - 1;\n    }\n\n    return sum;\n  }\n\n  /**\n   * Find the total height between 2 row indexes\n   */\n  queryBetween(atIndexA: number, atIndexB: number): number {\n    return this.query(atIndexB) - this.query(atIndexA - 1);\n  }\n\n  /**\n   * Given the ScrollY position i.e. sum, provide the rowIndex\n   * that is present in the current view port.\n   */\n  private calcRowIndex(sum: number): number {\n    if (!this.treeArray.length) return 0;\n\n    let pos = -1;\n    const dataLength = this.treeArray.length;\n\n    // Get the highest bit for the block size.\n    const highestBit = Math.pow(2, dataLength.toString(2).length - 1);\n\n    for (let blockSize = highestBit; blockSize !== 0; blockSize >>= 1) {\n      const nextPos = pos + blockSize;\n      if (nextPos < dataLength && sum >= this.treeArray[nextPos]) {\n        sum -= this.treeArray[nextPos];\n        pos = nextPos;\n      }\n    }\n\n    return pos + 1;\n  }\n}\n"]}