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package name.didier.david.test4j.unit;

import static org.apache.commons.lang3.StringUtils.EMPTY;
import static org.apache.commons.lang3.StringUtils.SPACE;

import java.io.File;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Useful data providers for common testing patterns.
 *
 * @author ddidier
 */
public final class DataProviders {

    /** Utility class. */
    private DataProviders() {
        super();
    }

    // -----------------------------------------------------------------------------------------------------------------

    /**
     * @return {@code null} strings.
     */
    public static String[][] nullStrings() {
        return new String[][] { { null } };
    }

    /**
     * @return {@code null} and empty strings.
     */
    public static String[][] emptyStrings() {
        return new String[][] { { null }, { EMPTY } };
    }

    /**
     * @return {@code null}, empty and blank strings.
     */
    public static String[][] blankStrings() {
        return new String[][] { { null }, { EMPTY }, { SPACE } };
    }

    /**
     * @return empty and blank strings.
     */
    public static String[][] emptyButNotNullStrings() {
        return new String[][] { { EMPTY }, { SPACE } };
    }

    // -----------------------------------------------------------------------------------------------------------------

    /**
     * @return strictly negative numbers.
     */
    public static Number[][] strictlyNegativeNumbers() {
        return new Number[][] { { -1000 }, { -100 }, { -10 }, { -1 } };
    }

    /**
     * @return negative or zero numbers.
     */
    public static Number[][] negativeNumbers() {
        return new Number[][] { { -1000 }, { -100 }, { -10 }, { -1 }, { 0 } };
    }

    /**
     * @return strictly positive numbers.
     */
    public static Number[][] strictlyPositiveNumbers() {
        return new Number[][] { { 1 }, { 10 }, { 100 }, { 1000 } };
    }

    /**
     * @return positive or zero numbers.
     */
    public static Number[][] positiveNumbers() {
        return new Number[][] { { 0 }, { 1 }, { 10 }, { 100 }, { 1000 } };
    }

    // -----------------------------------------------------------------------------------------------------------------

    /**
     * @param  the type of the elements in the list.
     * @return {@code null} and empty {@link List}.
     */
    @SuppressWarnings("unchecked")
    public static  List[][] emptyLists() {
        return (List[][]) new List[][] { { null }, { new ArrayList<>() } };
    }

    /**
     * @param  the type of the elements in the set.
     * @return {@code null} and empty {@link Set}.
     */
    @SuppressWarnings("unchecked")
    public static  Set[][] emptySets() {
        return (Set[][]) new Set[][] { { null }, { new HashSet<>() } };
    }

    // -----------------------------------------------------------------------------------------------------------------

    /**
     * @return non existing files: empty path, blank path, invalid path.
     */
    public static File[][] nonExistingFiles() {
        // @formatter:off
        return new File[][] {
            { new File(EMPTY) },
            { new File(SPACE) },
            { new File("some_hopefully_invalid_file@@@123") },
        };
        // @formatter:on
    }

    // -----------------------------------------------------------------------------------------------------------------

    // Digests and conversions done with:
    // - http://www.freeformatter.com/hmac-generator.html
    // - http://tomeko.net/online_tools/hex_to_base64.php?lang=en

    /**
     * @return a pair message/signature (HMAC using MD5 encoded in hexadecimal).
     */
    public static String[][] hmacMd5Base16() {
        // @formatter:off
        return new String[][] {
            { "something to sign MD5/16",     "92a98473515a3c1603dadf62f74f3919" },
            { "another thing to sign MD5/16", "b20e2291beec4c7ef905717425f68bb9" },
            { "something to sign MD5/16",     "92a98473515a3c1603dadf62f74f3919" },
            { "another thing to sign MD5/16", "b20e2291beec4c7ef905717425f68bb9" },
        };
        // @formatter:on
    }

    /**
     * @return a pair message/signature (HMAC using MD5 encoded in base 64).
     */
    public static String[][] hmacMd5Base64() {
        // @formatter:off
        return new String[][] {
            { "something to sign MD5/64",     "rV/ZLc5nCerkL+p8URqmVg==" },
            { "another thing to sign MD5/64", "W6wfT321SH/YVjlNHQYs9w==" },
            { "something to sign MD5/64",     "rV/ZLc5nCerkL+p8URqmVg==" },
            { "another thing to sign MD5/64", "W6wfT321SH/YVjlNHQYs9w==" },
        };
        // @formatter:on
    }

    /**
     * @return a pair message/signature (HMAC using SHA256 encoded in hexadecimal).
     */
    public static String[][] hmacSha256Base16() {
        // @formatter:off
        return new String[][] {
            { "something to sign SHA256/16",     "c94011f098e4351e77cfdd317d5f0f29d2697abf4ae52c91e5fc1aeaac7dbacc" },
            { "another thing to sign SHA256/16", "a67d2c56cd9f7ef1f0e1bd8c67ba688d27dbb1fe4accb86cdbfc813feec8659d" },
            { "something to sign SHA256/16",     "c94011f098e4351e77cfdd317d5f0f29d2697abf4ae52c91e5fc1aeaac7dbacc" },
            { "another thing to sign SHA256/16", "a67d2c56cd9f7ef1f0e1bd8c67ba688d27dbb1fe4accb86cdbfc813feec8659d" },
        };
        // @formatter:on
    }

    /**
     * @return a pair message/signature (HMAC using SHA256 encoded in base 64).
     */
    public static String[][] hmacSha256Base64() {
        // @formatter:off
        return new String[][] {
            { "something to sign SHA256/64",     "Ljqk7O9pqM/K9meMcOgo6bJZe4dPE6UWnaRfcU6P2jA=" },
            { "another thing to sign SHA256/64", "ld8Iguof3vAG+2BVOnXlR6iSCQb6sI0Vjyv1jOBtisQ=" },
            { "something to sign SHA256/64",     "Ljqk7O9pqM/K9meMcOgo6bJZe4dPE6UWnaRfcU6P2jA=" },
            { "another thing to sign SHA256/64", "ld8Iguof3vAG+2BVOnXlR6iSCQb6sI0Vjyv1jOBtisQ=" },
        };
        // @formatter:on
    }
}