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#include "composer/internal/trie.h"

#include "base/base.h"
#include "testing/base/public/gunit.h"

TEST(TrieTest, Trie) {
  mozc::composer::Trie<string> trie;

  enum TestType {
    LOOKUP,
    ADD,
    REMOVE,
  };
  static const struct TestCase {
    const int type;
    const string key;
    const string value;
    const bool expected_found;
    const string expected_value;
  } test_cases[] = {
    { ADD, "abc", "data_abc", true, "data_abc" },
    { ADD, "abd", "data_abd", true, "data_abd" },
    { ADD, "abcd", "data_abcd", true, "data_abcd" },
    { ADD, "abc", "data_abc2", true, "data_abc2" },
    { ADD, "bcd", "data_bcd", true, "data_bcd" },
    { LOOKUP, "abc", "", true, "data_abc2" },
    { LOOKUP, "abd", "", true, "data_abd" },
    { LOOKUP, "abcd", "", true, "data_abcd" },
    { LOOKUP, "bcd", "", true, "data_bcd" },
    { LOOKUP, "xyz", "", false, "" },
    { LOOKUP, "abcde", "", false, "" },
    { REMOVE, "bcd", "", false, "" },
    { REMOVE, "abd", "", false, "" },
    { LOOKUP, "abc", "", true, "data_abc2" },
    { LOOKUP, "abcd", "", true, "data_abcd" },
    { REMOVE, "abc", "", false, "" },
    { LOOKUP, "abcd", "", true, "data_abcd" },
    { REMOVE, "xyz", "", false, "" },
  };
  const int size = ARRAYSIZE(test_cases);
  for (int i = 0; i < size; ++i) {
    const TestCase& test = test_cases[i];
    switch (test.type) {
    case ADD:
      trie.AddEntry(test.key, test.value);
      break;
    case REMOVE:
      trie.DeleteEntry(test.key);
      break;
    case LOOKUP:
    default:
      // do nothing
      break;
    }
    string data;
    const bool found = trie.LookUp(test.key, &data);
    EXPECT_EQ(found, test.expected_found);
    if (found) {
      EXPECT_EQ(data, test.expected_value);
    }
  }
}

TEST(TrieTest, LookUpPrefix) {
  mozc::composer::Trie<string> trie;
  trie.AddEntry("abc", "[ABC]");
  trie.AddEntry("abd", "[ABD]");
  trie.AddEntry("a", "[A]");

  string value;
  size_t key_length = 0;
  bool has_subtrie = false;
  EXPECT_TRUE(trie.LookUpPrefix("abc", &value, &key_length, &has_subtrie));
  EXPECT_EQ("[ABC]", value);
  EXPECT_EQ(3, key_length);

  value.clear();
  key_length = 0;
  EXPECT_TRUE(trie.LookUpPrefix("abcd", &value, &key_length, &has_subtrie));
  EXPECT_EQ("[ABC]", value);
  EXPECT_EQ(3, key_length);

  value.clear();
  key_length = 0;
  EXPECT_FALSE(trie.LookUpPrefix("abe", &value, &key_length, &has_subtrie));

  value.clear();
  key_length = 0;
  EXPECT_TRUE(trie.LookUpPrefix("ac", &value, &key_length, &has_subtrie));
  EXPECT_EQ("[A]", value);
  EXPECT_EQ(1, key_length);

  value.clear();
  key_length = 0;
  EXPECT_FALSE(trie.LookUpPrefix("xyz", &value, &key_length, &has_subtrie));
}

namespace {
bool HasData(const vector<string> &values, const string &value) {
  for (size_t i = 0; i < values.size(); ++i) {
    if (values[i] == value) {
      return true;
    }
  }
  return false;
}
}  // namespace

TEST(TrieTest, LookUpPredictiveAll) {
  mozc::composer::Trie<string> trie;
  trie.AddEntry("abc", "[ABC]");
  trie.AddEntry("abd", "[ABD]");
  trie.AddEntry("a", "[A]");

  {
    vector<string> values;
    trie.LookUpPredictiveAll("a", &values);
    EXPECT_EQ(3, values.size());
    EXPECT_TRUE(HasData(values, "[ABC]"));
    EXPECT_TRUE(HasData(values, "[ABD]"));
    EXPECT_TRUE(HasData(values, "[A]"));
  }

  {
    vector<string> values;
    trie.LookUpPredictiveAll("ab", &values);
    EXPECT_EQ(2, values.size());
    EXPECT_TRUE(HasData(values, "[ABC]"));
    EXPECT_TRUE(HasData(values, "[ABD]"));
  }

  {
    vector<string> values;
    trie.LookUpPredictiveAll("abc", &values);
    EXPECT_EQ(1, values.size());
    EXPECT_TRUE(HasData(values, "[ABC]"));
  }

  {
    vector<string> values;
    trie.LookUpPredictiveAll("", &values);
    EXPECT_EQ(3, values.size());
    EXPECT_TRUE(HasData(values, "[ABC]"));
    EXPECT_TRUE(HasData(values, "[ABD]"));
    EXPECT_TRUE(HasData(values, "[A]"));
  }

  {
    vector<string> values;
    trie.LookUpPredictiveAll("x", &values);
    EXPECT_EQ(0, values.size());
  }
}