/*
 * Copyright (C) 2015 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.compatibility.common.tradefed.build;

import com.android.compatibility.SuiteInfo;
import com.android.tradefed.build.IBuildInfo;
import com.android.tradefed.build.IFolderBuildInfo;

import java.io.File;
import java.io.FileNotFoundException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * A simple helper that stores and retrieves information from a {@link IBuildInfo}.
 */
public class CompatibilityBuildHelper {

    public static final String MODULE_IDS = "MODULE_IDS";

    public static final String ROOT_DIR = "ROOT_DIR";
    public static final String SUITE_NAME = "SUITE_NAME";
    public static final String START_TIME_MS = "START_TIME_MS";

    private static final String ROOT_DIR2 = "ROOT_DIR2";
    private static final String SUITE_BUILD = "SUITE_BUILD";
    private static final String SUITE_FULL_NAME = "SUITE_FULL_NAME";
    private static final String SUITE_VERSION = "SUITE_VERSION";
    private static final String SUITE_PLAN = "SUITE_PLAN";
    private static final String RESULT_DIR = "RESULT_DIR";
    private static final String CONFIG_PATH_PREFIX = "DYNAMIC_CONFIG_FILE:";
    private static final String DYNAMIC_CONFIG_OVERRIDE_URL = "DYNAMIC_CONFIG_OVERRIDE_URL";
    private static final String COMMAND_LINE_ARGS = "command_line_args";
    private static final String RETRY_COMMAND_LINE_ARGS = "retry_command_line_args";
    private final IBuildInfo mBuildInfo;
    private boolean mInitialized = false;

    /**
     * Creates a {@link CompatibilityBuildHelper} wrapping the given {@link IBuildInfo}.
     */
    public CompatibilityBuildHelper(IBuildInfo buildInfo) {
        mBuildInfo = buildInfo;
    }

    /**
     * Initializes the {@link IBuildInfo} from the manifest with the current time
     * as the start time.
     */
    public void init(String suitePlan, String dynamicConfigUrl) {
        init(suitePlan, dynamicConfigUrl, System.currentTimeMillis());
    }

    /**
     * Initializes the {@link IBuildInfo} from the manifest.
     */
    public void init(String suitePlan, String dynamicConfigUrl, long startTimeMs) {
        if (mInitialized) {
            return;
        }
        mInitialized = true;
        mBuildInfo.addBuildAttribute(SUITE_BUILD, SuiteInfo.BUILD_NUMBER);
        mBuildInfo.addBuildAttribute(SUITE_NAME, SuiteInfo.NAME);
        mBuildInfo.addBuildAttribute(SUITE_FULL_NAME, SuiteInfo.FULLNAME);
        mBuildInfo.addBuildAttribute(SUITE_VERSION, SuiteInfo.VERSION);
        mBuildInfo.addBuildAttribute(SUITE_PLAN, suitePlan);
        mBuildInfo.addBuildAttribute(START_TIME_MS, Long.toString(startTimeMs));
        mBuildInfo.addBuildAttribute(RESULT_DIR, getDirSuffix(startTimeMs));
        String rootDirPath = null;
        if (mBuildInfo instanceof IFolderBuildInfo) {
            File rootDir = ((IFolderBuildInfo) mBuildInfo).getRootDir();
            if (rootDir != null) {
                rootDirPath = rootDir.getAbsolutePath();
            }
        }
        rootDirPath = System.getProperty(String.format("%s_ROOT", SuiteInfo.NAME), rootDirPath);
        if (rootDirPath == null || rootDirPath.trim().equals("")) {
            throw new IllegalArgumentException(
                    String.format("Missing install path property %s_ROOT", SuiteInfo.NAME));
        }
        File rootDir = new File(rootDirPath);
        if (!rootDir.exists()) {
            throw new IllegalArgumentException(
                    String.format("Root directory doesn't exist %s", rootDir.getAbsolutePath()));
        }
        mBuildInfo.addBuildAttribute(ROOT_DIR, rootDir.getAbsolutePath());
        if (dynamicConfigUrl != null && !dynamicConfigUrl.isEmpty()) {
            mBuildInfo.addBuildAttribute(DYNAMIC_CONFIG_OVERRIDE_URL,
                    dynamicConfigUrl.replace("{suite-name}", getSuiteName()));
        }
    }

    public IBuildInfo getBuildInfo() {
        return mBuildInfo;
    }

    public void setRetryCommandLineArgs(String commandLineArgs) {
        mBuildInfo.addBuildAttribute(RETRY_COMMAND_LINE_ARGS, commandLineArgs);
    }

    public String getCommandLineArgs() {
        if (mBuildInfo.getBuildAttributes().containsKey(RETRY_COMMAND_LINE_ARGS)) {
            return mBuildInfo.getBuildAttributes().get(RETRY_COMMAND_LINE_ARGS);
        } else {
            // NOTE: this is a temporary workaround set in TestInvocation#invoke in tradefed.
            // This will be moved to a separate method in a new invocation metadata class.
            return mBuildInfo.getBuildAttributes().get(COMMAND_LINE_ARGS);
        }
    }

    public String getRecentCommandLineArgs() {
        return mBuildInfo.getBuildAttributes().get(COMMAND_LINE_ARGS);
    }

    public String getSuiteBuild() {
        return mBuildInfo.getBuildAttributes().get(SUITE_BUILD);
    }

    public String getSuiteName() {
        return mBuildInfo.getBuildAttributes().get(SUITE_NAME);
    }

    public String getSuiteFullName() {
        return mBuildInfo.getBuildAttributes().get(SUITE_FULL_NAME);
    }

    public String getSuiteVersion() {
        return mBuildInfo.getBuildAttributes().get(SUITE_VERSION);
    }

    public String getSuitePlan() {
        return mBuildInfo.getBuildAttributes().get(SUITE_PLAN);
    }

    public String getDynamicConfigUrl() {
        return mBuildInfo.getBuildAttributes().get(DYNAMIC_CONFIG_OVERRIDE_URL);
    }

    public long getStartTime() {
        return Long.parseLong(mBuildInfo.getBuildAttributes().get(START_TIME_MS));
    }

    public void addDynamicConfigFile(String moduleName, File configFile) {
        mBuildInfo.addBuildAttribute(CONFIG_PATH_PREFIX + moduleName, configFile.getAbsolutePath());
    }

    public void setModuleIds(String[] moduleIds) {
        mBuildInfo.addBuildAttribute(MODULE_IDS, String.join(",", moduleIds));
    }

    public Map<String, File> getDynamicConfigFiles() {
        Map<String, File> configMap = new HashMap<>();
        for (String key : mBuildInfo.getBuildAttributes().keySet()) {
            if (key.startsWith(CONFIG_PATH_PREFIX)) {
                configMap.put(key.substring(CONFIG_PATH_PREFIX.length()),
                        new File(mBuildInfo.getBuildAttributes().get(key)));
            }
        }
        return configMap;
    }

    /**
     * @return a {@link File} representing the directory holding the Compatibility installation
     * @throws FileNotFoundException if the directory does not exist
     */
    public File getRootDir() throws FileNotFoundException {
        File dir = null;
        if (mBuildInfo instanceof IFolderBuildInfo) {
            dir = ((IFolderBuildInfo) mBuildInfo).getRootDir();
        }
        if (dir == null || !dir.exists()) {
            dir = new File(mBuildInfo.getBuildAttributes().get(ROOT_DIR));
            if (!dir.exists()) {
                dir = new File(mBuildInfo.getBuildAttributes().get(ROOT_DIR2));
            }
        }
        if (!dir.exists()) {
            throw new FileNotFoundException(String.format(
                    "Compatibility root directory %s does not exist",
                    dir.getAbsolutePath()));
        }
        return dir;
    }

    /**
     * @return a {@link File} representing the "android-<suite>" folder of the Compatibility
     * installation
     * @throws FileNotFoundException if the directory does not exist
     */
    public File getDir() throws FileNotFoundException {
        File dir = new File(getRootDir(), String.format("android-%s", getSuiteName().toLowerCase()));
        if (!dir.exists()) {
            throw new FileNotFoundException(String.format(
                    "Compatibility install folder %s does not exist",
                    dir.getAbsolutePath()));
        }
        return dir;
    }

    /**
     * @return a {@link File} representing the results directory.
     * @throws FileNotFoundException if the directory structure is not valid.
     */
    public File getResultsDir() throws FileNotFoundException {
        return new File(getDir(), "results");
    }

    /**
     * @return a {@link File} representing the result directory of the current invocation.
     * @throws FileNotFoundException if the directory structure is not valid.
     */
    public File getResultDir() throws FileNotFoundException {
        return new File(getResultsDir(),
            getDirSuffix(Long.parseLong(mBuildInfo.getBuildAttributes().get(START_TIME_MS))));
    }

    /**
     * @return a {@link File} representing the directory to store result logs.
     * @throws FileNotFoundException if the directory structure is not valid.
     */
    public File getLogsDir() throws FileNotFoundException {
        return new File(getDir(), "logs");
    }

    /**
     * @return a {@link File} representing the directory to store derivedplan files.
     * @throws FileNotFoundException if the directory structure is not valid.
     */
    public File getSubPlansDir() throws FileNotFoundException {
        File subPlansDir = new File(getDir(), "subplans");
        if (!subPlansDir.exists()) {
            subPlansDir.mkdirs();
        }
        return subPlansDir;
    }

    /**
     * @return a {@link File} representing the test modules directory.
     * @throws FileNotFoundException if the directory structure is not valid.
     */
    public File getTestsDir() throws FileNotFoundException {
        File testsDir = new File(getDir(), "testcases");
        if (!testsDir.exists()) {
            throw new FileNotFoundException(String.format(
                    "Compatibility tests folder %s does not exist",
                    testsDir.getAbsolutePath()));
        }
        return testsDir;
    }

    /**
     * @return a {@link File} in the resultDir for logging invocation failures
     */
    public File getInvocationFailureFile() throws FileNotFoundException {
        return new File(getResultDir(), "invocation_failure.txt");
    }

    /**
     * @return a {@link File} in the resultDir for counting expected test runs
     */
    public File getTestRunsFile() throws FileNotFoundException {
        return new File(getResultDir(), "test_runs.txt");
    }

    /**
     * @return a {@link String} to use for directory suffixes created from the given time.
     */
    public static String getDirSuffix(long millis) {
        return new SimpleDateFormat("yyyy.MM.dd_HH.mm.ss").format(new Date(millis));
    }
}