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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.common;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 */
public class Table {

    private List headers = new ArrayList<>();
    private List> rows = new ArrayList<>();
    private Map> map = Maps.newHashMap();
    private Map headerMap = Maps.newHashMap();
    private List currentCells;
    private boolean inHeaders = false;

    public Table startHeaders() {
        inHeaders = true;
        currentCells = new ArrayList<>();
        return this;
    }

    public Table endHeaders() {
        if (currentCells == null || currentCells.isEmpty()) {
            throw new IllegalStateException("no headers added...");
        }
        inHeaders = false;
        headers = currentCells;
        currentCells = null;

        /* Create associative structure for columns that
         * contain the same cells as the rows:
         *
         *     header1 => [Cell, Cell, ...]
         *     header2 => [Cell, Cell, ...]
         *     header3 => [Cell, Cell, ...]
         *
         * Also populate map to look up headers by name.
         *
         */
        for (Cell header : headers) {
            map.put(header.value.toString(), new ArrayList());
            headerMap.put(header.value.toString(), header);
        }

        return this;
    }

    public Table startRow() {
        if (headers.isEmpty()) {
            throw new IllegalStateException("no headers added...");
        }
        currentCells = new ArrayList<>(headers.size());
        return this;
    }

    public Table endRow(boolean check) {
        if (currentCells == null) {
            throw new IllegalStateException("no row started...");
        }
        if (check && (currentCells.size() != headers.size())) {
            StringBuilder s = new StringBuilder();
            s.append("mismatch on number of cells ");
            s.append(currentCells.size());
            s.append(" in a row compared to header ");
            s.append(headers.size());
            throw new IllegalStateException(s.toString());
        }
        rows.add(currentCells);
        currentCells = null;
        return this;
    }

    public Table endRow() {
        endRow(true);
        return this;
    }

    public Table addCell(Object value) {
        return addCell(value, "");
    }

    public Table addCell(Object value, String attributes) {
        if (currentCells == null) {
            throw new IllegalStateException("no block started...");
        }
        if (!inHeaders) {
            if (currentCells.size() == headers.size()) {
                throw new IllegalStateException("can't add more cells to a row than the header");
            }
        }
        Map mAttr;
        if (attributes.length() == 0) {
            if (inHeaders) {
                mAttr = ImmutableMap.of();
            } else {
                // get the attributes of the header cell we are going to add to
                mAttr = headers.get(currentCells.size()).attr;
            }
        } else {
            mAttr = new HashMap<>();
            if (!inHeaders) {
                // get the attributes of the header cell we are going to add
                mAttr.putAll(headers.get(currentCells.size()).attr);
            }
            String[] sAttrs = Strings.splitStringToArray(attributes, ';');
            for (String sAttr : sAttrs) {
                if (sAttr.length() == 0) {
                    continue;
                }
                int idx = sAttr.indexOf(':');
                mAttr.put(sAttr.substring(0, idx), sAttr.substring(idx + 1));
            }
        }

        Cell cell = new Cell(value, mAttr);
        int cellIndex = currentCells.size();
        currentCells.add(cell);

        // If we're in a value row, also populate the named column.
        if (!inHeaders) {
            String hdr = (String) headers.get(cellIndex).value;
            map.get(hdr).add(cell);
        }

        return this;
    }

    public List getHeaders() {
        return this.headers;
    }

    public List> getRows() {
        return rows;
    }

    public Map> getAsMap() {
        return this.map;
    }

    public Map getHeaderMap() {
        return this.headerMap;
    }

    public Cell findHeaderByName(String header) {
        for (Cell cell : headers) {
            if (cell.value.toString().equals(header)) {
                return cell;
            }
        }
        return null;
    }

    public static class Cell {
        public final Object value;
        public final Map attr;

        public Cell(Object value, Cell other) {
            this.value = value;
            this.attr = other.attr;
        }

        public Cell(Object value) {
            this.value = value;
            this.attr = new HashMap<>();
        }

        public Cell(Object value, Map attr) {
            this.value = value;
            this.attr = attr;
        }
    }
}