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/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed 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 com.android.ide.common.sdk;

import com.android.annotations.Nullable;

import java.util.Locale;

/** Information about available SDK Versions */
public class SdkVersionInfo {
    /**
     * The highest known API level. Note that the tools may also look at the
     * installed platforms to see if they can find more recently released
     * platforms, e.g. when the tools have not yet been updated for a new
     * release. This number is used as a baseline and any more recent platforms
     * found can be used to increase the highest known number.
     */
    public static final int HIGHEST_KNOWN_API = 19;

    /**
     * Returns the Android version and code name of the given API level, or null
     * if not known. The highest number (inclusive) that is supported
     * is {@link SdkVersionInfo#HIGHEST_KNOWN_API}.
     *
     * @param api the api level
     * @return a suitable version display name
     */
    @Nullable
    public static String getAndroidName(int api) {
        // See http://source.android.com/source/build-numbers.html
        switch (api) {
            case 1:  return "API 1: Android 1.0";
            case 2:  return "API 2: Android 1.1";
            case 3:  return "API 3: Android 1.5 (Cupcake)";
            case 4:  return "API 4: Android 1.6 (Donut)";
            case 5:  return "API 5: Android 2.0 (Eclair)";
            case 6:  return "API 6: Android 2.0.1 (Eclair)";
            case 7:  return "API 7: Android 2.1 (Eclair)";
            case 8:  return "API 8: Android 2.2 (Froyo)";
            case 9:  return "API 9: Android 2.3 (Gingerbread)";
            case 10: return "API 10: Android 2.3.3 (Gingerbread)";
            case 11: return "API 11: Android 3.0 (Honeycomb)";
            case 12: return "API 12: Android 3.1 (Honeycomb)";
            case 13: return "API 13: Android 3.2 (Honeycomb)";
            case 14: return "API 14: Android 4.0 (IceCreamSandwich)";
            case 15: return "API 15: Android 4.0.3 (IceCreamSandwich)";
            case 16: return "API 16: Android 4.1 (Jelly Bean)";
            case 17: return "API 17: Android 4.2 (Jelly Bean)";
            case 18: return "API 18: Android 4.3 (Jelly Bean)";
            case 19: return "API 19: Android 4.4 (KitKat)";
            // If you add more versions here, also update #getBuildCodes and
            // #HIGHEST_KNOWN_API

            default: return null;
        }
    }

    /**
     * Returns the applicable build code (for
     * {@code android.os.Build.VERSION_CODES}) for the corresponding API level,
     * or null if it's unknown. The highest number (inclusive) that is supported
     * is {@link SdkVersionInfo#HIGHEST_KNOWN_API}.
     *
     * @param api the API level to look up a version code for
     * @return the corresponding build code field name, or null
     */
    @Nullable
    public static String getBuildCode(int api) {
        // See http://developer.android.com/reference/android/os/Build.VERSION_CODES.html
        switch (api) {
            case 1:  return "BASE"; //$NON-NLS-1$
            case 2:  return "BASE_1_1"; //$NON-NLS-1$
            case 3:  return "CUPCAKE"; //$NON-NLS-1$
            case 4:  return "DONUT"; //$NON-NLS-1$
            case 5:  return "ECLAIR"; //$NON-NLS-1$
            case 6:  return "ECLAIR_0_1"; //$NON-NLS-1$
            case 7:  return "ECLAIR_MR1"; //$NON-NLS-1$
            case 8:  return "FROYO"; //$NON-NLS-1$
            case 9:  return "GINGERBREAD"; //$NON-NLS-1$
            case 10: return "GINGERBREAD_MR1"; //$NON-NLS-1$
            case 11: return "HONEYCOMB"; //$NON-NLS-1$
            case 12: return "HONEYCOMB_MR1"; //$NON-NLS-1$
            case 13: return "HONEYCOMB_MR2"; //$NON-NLS-1$
            case 14: return "ICE_CREAM_SANDWICH"; //$NON-NLS-1$
            case 15: return "ICE_CREAM_SANDWICH_MR1"; //$NON-NLS-1$
            case 16: return "JELLY_BEAN"; //$NON-NLS-1$
            case 17: return "JELLY_BEAN_MR1"; //$NON-NLS-1$
            case 18: return "JELLY_BEAN_MR2"; //$NON-NLS-1$
            case 19: return "KITKAT"; //$NON-NLS-1$
            // If you add more versions here, also update #getAndroidName and
            // #HIGHEST_KNOWN_API
        }

        return null;
    }

    /**
     * Returns the API level of the given build code (e.g. JELLY_BEAN_MR1 => 17), or -1 if not
     * recognized
     *
     * @param buildCode         the build code name (not case sensitive)
     * @param recognizeUnknowns if true, treat an unrecognized code name as a newly released
     *                          platform the tools are not yet aware of, and set its API level to
     *                          some higher number than all the currently known API versions
     * @return the API level, or -1 if not recognized (unless recognizeUnknowns is true, in which
     * {@link #HIGHEST_KNOWN_API} plus one is returned
     */
    public static int getApiByBuildCode(String buildCode, boolean recognizeUnknowns) {
        for (int api = 1; api <= HIGHEST_KNOWN_API; api++) {
            String code = getBuildCode(api);
            if (code != null && code.equalsIgnoreCase(buildCode)) {
                return api;
            }
        }

        return recognizeUnknowns ? HIGHEST_KNOWN_API + 1 : -1;
    }

    /**
     * Returns the API level of the given preview code name (e.g. JellyBeanMR2 => 17), or -1 if not
     * recognized
     *
     * @param previewName       the preview name (not case sensitive)
     * @param recognizeUnknowns if true, treat an unrecognized code name as a newly released
     *                          platform the tools are not yet aware of, and set its API level to
     *                          some higher number than all the currently known API versions
     * @return the API level, or -1 if not recognized (unless recognizeUnknowns is true, in which
     * {@link #HIGHEST_KNOWN_API} plus one is returned
     */
    public static int getApiByPreviewName(String previewName, boolean recognizeUnknowns) {
        // JellyBean => JELLY_BEAN
        String codeName = camelCaseToUnderlines(previewName).toUpperCase(Locale.US);
        return getApiByBuildCode(codeName, recognizeUnknowns);
    }

    /**
     * Converts a CamelCase word into an underlined_word
     *
     * @param string the CamelCase version of the word
     * @return the underlined version of the word
     */
    public static String camelCaseToUnderlines(String string) {
        if (string.isEmpty()) {
            return string;
        }

        StringBuilder sb = new StringBuilder(2 * string.length());
        int n = string.length();
        boolean lastWasUpperCase = Character.isUpperCase(string.charAt(0));
        for (int i = 0; i < n; i++) {
            char c = string.charAt(i);
            boolean isUpperCase = Character.isUpperCase(c);
            if (isUpperCase && !lastWasUpperCase) {
                sb.append('_');
            }
            lastWasUpperCase = isUpperCase;
            c = Character.toLowerCase(c);
            sb.append(c);
        }

        return sb.toString();
    }

    /**
     * Converts an underlined_word into a CamelCase word
     *
     * @param string the underlined word to convert
     * @return the CamelCase version of the word
     */
    public static String underlinesToCamelCase(String string) {
        StringBuilder sb = new StringBuilder(string.length());
        int n = string.length();

        int i = 0;
        @SuppressWarnings("SpellCheckingInspection")
        boolean upcaseNext = true;
        for (; i < n; i++) {
            char c = string.charAt(i);
            if (c == '_') {
                upcaseNext = true;
            } else {
                if (upcaseNext) {
                    c = Character.toUpperCase(c);
                }
                upcaseNext = false;
                sb.append(c);
            }
        }

        return sb.toString();
    }
}




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