/*
 * Copyright (C) 2008 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.cts;

import java.io.BufferedReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;

/**
 * Interact with user to select from optional items.
 *
 */
abstract public class Selector {
    public static final String PACKAGE_SELECTOR = "packageSelector";
    public static final String SUITE_SELECTOR   = "suiteSelector";
    public static final String CASE_SELECTOR    = "caseSelector";
    public static final String TEST_SELECTOR    = "testSelector";

    public static final String PACKAGE_HDR  = "[Choose package] ";
    public static final String PACKAGE_TAIL =
        ": select[Y], reject[n], or choose suite in it[m]?  [Y/n/m] ";

    public static final String SUITE_HDR    = "[Choose suite]   ";
    public static final String SUITE_TAIL   =
        ": select[Y], reject[n], or choose case in it[m]?  [Y/n/m] ";

    public static final String CASE_HDR  = "[Choose case]    ";
    public static final String CASE_TAIL =
        ": select[Y], reject[n], or choose method in it[m]?  [Y/n/m] ";

    public static final String TEST_HDR     = "[Choose test]    ";
    public static final String TEST_TAIL    = "?: [Y/n] ";

    /**
     * Define user's possible selections.
     *
     */
    public enum Selection {
        ACCEPT, REJECT, MORE
    }

    public List<String> mRecords;

    public String mHdr;
    public String mTail;
    public String mType;

    public BufferedReader mBufferedReader;

    public Selector(String type, List<String> records) {
        mRecords = records;
        Collections.sort(mRecords);
        mBufferedReader = null;
        mType = type;

        if (type.equals(PACKAGE_SELECTOR)) {
            mHdr  = PACKAGE_HDR;
            mTail = PACKAGE_TAIL;
        } else if (type.equals(SUITE_SELECTOR)) {
            mHdr  = SUITE_HDR;
            mTail = SUITE_TAIL;
        } else if (type.equals(CASE_SELECTOR)) {
            mHdr  = CASE_HDR;
            mTail = CASE_TAIL;
        } else if (type.equals(TEST_SELECTOR)) {
            mHdr  = TEST_HDR;
            mTail = TEST_TAIL;
        }
    }

    /**
     * Set the input stream of BufferedReader type.
     *
     * @param in The input stream.
     */
    public void setInputStream(BufferedReader in) {
        mBufferedReader = in;
    }

    /**
     * Read a specific line from the input stream.
     *
     * @param prompt The prompt displayed on the console to notify the user.
     * @return The string the user typed in over the console.
     */
    public String readLine(String prompt) throws IOException {
        String str = null;
        if (mBufferedReader != null) {
            CUIOutputStream.print(prompt);
            str = mBufferedReader.readLine().trim();
        }

        return str;
    }

    /**
     * Interact with the user to decide what are included and what
     * others are not.
     *
     * @param name The specific name.
     * @return The selection by the user.
     */
    public Selection doAccept(final String name) throws IOException {
        Selection selection = Selection.REJECT;

        if (mType.equals(TEST_SELECTOR)) {
            String prompt = mHdr + "Include " + name + mTail;
            String answer = readLine(prompt);
            while (!answer.matches("[yn]?")) {
                CUIOutputStream.println(
                           "Invalid input. Please chose 'y' or 'n' (default is 'y')");
                answer = readLine(prompt);
            }

            if (ConsoleUi.isConfirmation(answer, true)) {
                selection = Selection.ACCEPT;
            }
        } else {
            String prompt = mHdr + name + mTail;
            String answer = readLine(prompt);
            while (!answer.matches("[ynm]?")) {
                CUIOutputStream.println(
                           "Invalid input. Please chose 'y', 'n', or 'm' (default is 'y')");
                answer = readLine(prompt);
            }

            if (ConsoleUi.isConfirmation(answer, true)) {
                selection = Selection.ACCEPT;
            } else if (0 == "m".compareToIgnoreCase(answer)) {
                selection = Selection.MORE;
            }
        }

        return selection;
    }

    /**
     * Check if the specified name has been selected against the selected list.
     *
     * @param selectedList The selected list.
     * @param name The specified name to be checked.
     * @return If selected, return true; else, return false.
     */
    public boolean isSelected(ArrayList<String> selectedList, String name) {
        for (String str : selectedList) {
            if (name.equals(str) || isSubName(str, name)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Check whether a package name is a sub-package name of parent name.
     *
     * @param parent The parent package name.
     * @param name The package name.
     * @return True if it's a sub-package name of parent.
     */
     private boolean isSubName(String parent, String name) {
        return name.startsWith(parent + ".");
    }
}

/**
 * Building the specific plan by following user's selection.
 */
class PlanBuilder extends Selector{
    private SuiteSelector mSuiteSelector;

    public PlanBuilder(List<String> records) {
        super(PACKAGE_SELECTOR, records);
    }

    /**
     * Interact with user to select over packages.
     *
     * @return The selected result with excluded lists.
     */
    public HashMap<String, ArrayList<String>> doSelect() throws IOException {
        HashMap<String, ArrayList<String>> packages = new HashMap<String, ArrayList<String>>();
        for (String javaPkgName : mRecords) {
            Selection select = doAccept(javaPkgName);
            TestPackage testPackage =
                HostConfig.getInstance().getTestPackage(javaPkgName);
            if (select == Selection.ACCEPT) {
                packages.put(javaPkgName, null);
            } else if (select == Selection.MORE) {
                List<String> suiteNames = testPackage.getAllTestSuiteNames();
                mSuiteSelector = new SuiteSelector(suiteNames, testPackage);

                if (mBufferedReader != null) {
                    mSuiteSelector.setInputStream(mBufferedReader);
                }

                ArrayList<String> excludedSuites = new ArrayList<String>();
                ArrayList<String> excludedCases = new ArrayList<String>();
                mSuiteSelector.doSelect(excludedSuites, excludedCases);
                if (suiteNames.size() == excludedSuites.size()) {
                    Log.i("package=" + javaPkgName + " has been removed all.");
                } else {
                    excludedSuites.addAll(excludedCases);
                    packages.put(javaPkgName, excludedSuites);
                }
            }
        }

        if (packages.size() == 0) {
            return null;
        } else {
            return packages;
        }
    }

    /**
     * Suite selector.
     *
     */
    class SuiteSelector extends Selector {
        private TestCaseSelector mCaseSelector;
        private TestPackage mTestPackage;

        public SuiteSelector(List<String> suites, TestPackage testPackage) {
            super(SUITE_SELECTOR, suites);
            mTestPackage = testPackage;
        }

        /**
         * Interact with user to select over suites.
         *
         * @param excludedTestSuites The fully excluded test suite list.
         * @param excludedTestCases The excluded test case list.
         */
        public void doSelect(ArrayList<String> excludedTestSuites,
                ArrayList<String> excludedTestCases) throws IOException {
            ArrayList<String> selectedList = new ArrayList<String>();
            for (String suiteName : mRecords) {
                if (!isSelected(selectedList, suiteName)) {
                    Selection select = doAccept(suiteName);
                    if (select == Selection.REJECT) {
                        excludedTestSuites.add(suiteName);
                    } else if (select == Selection.MORE) {
                        List<String> testCaseNames =
                            mTestPackage.getAllTestCaseNames(suiteName);
                        mCaseSelector = new TestCaseSelector(testCaseNames, mTestPackage);

                        if (mBufferedReader != null) {
                            mCaseSelector.setInputStream(mBufferedReader);
                        }

                        ArrayList<String> notIncludedTestCases = new ArrayList<String>();
                        ArrayList<String> notIncludedTests = new ArrayList<String>();
                        mCaseSelector.doSelect(notIncludedTestCases, notIncludedTests);
                        if (testCaseNames.size() == notIncludedTestCases.size()) {
                            Log.i("suite=" + suiteName + " has been removed all");
                            excludedTestSuites.add(suiteName);
                        } else {
                            excludedTestCases.addAll(notIncludedTestCases);
                            excludedTestCases.addAll(notIncludedTests);
                        }
                    }
                    selectedList.add(suiteName);
                }
            }
        }
    }

    /**
     * TestCase selector.
     */
    class TestCaseSelector extends Selector {
        private TestSelector mTestSelector;
        private TestPackage mTestPackage;

        public TestCaseSelector(List<String> testCases, TestPackage testPackage) {
            super(CASE_SELECTOR, testCases);
            mTestPackage = testPackage;
        }

        /**
         * Interact with user to select over test cases.
         *
         * @param excludedTestCases The fully excluded test case list.
         * @param excludedTests The excluded test list.
         */
        public void doSelect(ArrayList<String> excludedTestCases,
                ArrayList<String> excludedTests) throws IOException {
            ArrayList<String> selectedList = new ArrayList<String>();
            for (String testCaseName : mRecords) {
                if (!isSelected(selectedList, testCaseName)) {
                    Selection select = doAccept(testCaseName);
                    if (select == Selection.REJECT) {
                        excludedTestCases.add(testCaseName);
                    } else if (select == Selection.MORE) {
                        List<String> testNames = mTestPackage.getAllTestNames(testCaseName);
                        mTestSelector = new TestSelector(testNames);

                        if (mBufferedReader != null) {
                            mTestSelector.setInputStream(mBufferedReader);
                        }

                        ArrayList<String> notIncludedTests = mTestSelector.doSelect();
                        if (notIncludedTests.size() == testNames.size()) {
                            Log.i("testCase=" + testCaseName + " has been removed all");
                            excludedTestCases.add(testCaseName);
                        } else {
                            excludedTests.addAll(notIncludedTests);
                        }
                    }
                    selectedList.add(testCaseName);
                }
            }
        }
    }

    /**
     * Test selector.
     *
     */
    class TestSelector extends Selector {
        public TestSelector(List<String> records) {
            super(TEST_SELECTOR, records);
        }

        /**
         * Interact with user to select over tests.
         *
         * @return The selected result with excluded lists.
         */
        public ArrayList<String> doSelect() throws IOException {
            ArrayList<String> records = new ArrayList<String>();
            for (String test : mRecords) {
                Selection select = doAccept(test);
                if (select == Selection.REJECT) {
                    records.add(test);
                }
            }

            return records;
        }
    }
}