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#include "config.h"
#include "MockSpellCheck.h"

#include "platform/WebString.h"
#include <wtf/ASCIICType.h>
#include <wtf/Assertions.h>
#include <wtf/text/WTFString.h>

using namespace WebKit;

MockSpellCheck::MockSpellCheck()
    : m_initialized(false) { }

MockSpellCheck::~MockSpellCheck() { }

static bool isNotASCIIAlpha(UChar ch) { return !isASCIIAlpha(ch); }

bool MockSpellCheck::spellCheckWord(const WebString& text, int* misspelledOffset, int* misspelledLength)
{
    ASSERT(misspelledOffset);
    ASSERT(misspelledLength);

    // Initialize this spellchecker.
    initializeIfNeeded();

    // Reset the result values as our spellchecker does.
    *misspelledOffset = 0;
    *misspelledLength = 0;

    // Convert to a String because we store String instances in
    // m_misspelledWords and WebString has no find().
    WTF::String stringText(text.data(), text.length());
    int skippedLength = 0;

    while (!stringText.isEmpty()) {
        // Extract the first possible English word from the given string.
        // The given string may include non-ASCII characters or numbers. So, we
        // should filter out such characters before start looking up our
        // misspelled-word table.
        // (This is a simple version of our SpellCheckWordIterator class.)
        // If the given string doesn't include any ASCII characters, we can treat the
        // string as valid one.
        // Unfortunately, This implementation splits a contraction, i.e. "isn't" is
        // split into two pieces "isn" and "t". This is OK because webkit tests
        // don't have misspelled contractions.
        int wordOffset = stringText.find(isASCIIAlpha);
        if (wordOffset == -1)
            return true;
        int wordEnd = stringText.find(isNotASCIIAlpha, wordOffset);
        int wordLength = wordEnd == -1 ? static_cast<int>(stringText.length()) - wordOffset : wordEnd - wordOffset;

        // Look up our misspelled-word table to check if the extracted word is a
        // known misspelled word, and return the offset and the length of the
        // extracted word if this word is a known misspelled word.
        // (See the comment in MockSpellCheck::initializeIfNeeded() why we use a
        // misspelled-word table.)
        WTF::String word = stringText.substring(wordOffset, wordLength);
        if (m_misspelledWords.contains(word)) {
            *misspelledOffset = wordOffset + skippedLength;
            *misspelledLength = wordLength;
            break;
        }

        ASSERT(0 < wordOffset + wordLength);
        stringText = stringText.substring(wordOffset + wordLength);
        skippedLength += wordOffset + wordLength;
    }

    return false;
}

void MockSpellCheck::fillSuggestionList(const WebString& word, Vector<WebString>* suggestions)
{
    if (word == WebString::fromUTF8("wellcome"))
        suggestions->append(WebString::fromUTF8("welcome"));
}

bool MockSpellCheck::initializeIfNeeded()
{
    // Exit if we have already initialized this object.
    if (m_initialized)
        return false;

    // Create a table that consists of misspelled words used in WebKit layout
    // tests.
    // Since WebKit layout tests don't have so many misspelled words as
    // well-spelled words, it is easier to compare the given word with misspelled
    // ones than to compare with well-spelled ones.
    static const char* misspelledWords[] = {
        // These words are known misspelled words in webkit tests.
        // If there are other misspelled words in webkit tests, please add them in
        // this array.
        "foo",
        "Foo",
        "baz",
        "fo",
        "LibertyF",
        "chello",
        "xxxtestxxx",
        "XXxxx",
        "Textx",
        "blockquoted",
        "asd",
        "Lorem",
        "Nunc",
        "Curabitur",
        "eu",
        "adlj",
        "adaasj",
        "sdklj",
        "jlkds",
        "jsaada",
        "jlda",
        "zz",
        "contentEditable",
        // The following words are used by unit tests.
        "ifmmp",
        "qwertyuiopasd",
        "qwertyuiopasdf",
        "wellcome"
    };

    m_misspelledWords.clear();
    for (size_t i = 0; i < arraysize(misspelledWords); ++i)
        m_misspelledWords.add(WTF::String::fromUTF8(misspelledWords[i]), false);

    // Mark as initialized to prevent this object from being initialized twice
    // or more.
    m_initialized = true;

    // Since this MockSpellCheck class doesn't download dictionaries, this
    // function always returns false.
    return false;
}