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#include <algorithm>
#include <limits>

#include "testing/base/public/gunit.h"
#include "unix/ibus/surrounding_text_util.h"

namespace mozc {
namespace ibus {

TEST(SurroundingTextUtilTest, GetSafeDelta) {
  const guint kSafeInt32MaxAsGUint =
      static_cast<guint>(numeric_limits<int32>::max());
  const guint kTooLargeGUint = kSafeInt32MaxAsGUint + 42;

  int32 delta = 0;

  EXPECT_TRUE(SurroundingTextUtil::GetSafeDelta(42, 10, &delta));
  EXPECT_EQ(32, delta);

  EXPECT_TRUE(SurroundingTextUtil::GetSafeDelta(1, 1, &delta));
  EXPECT_EQ(0, delta);

  EXPECT_TRUE(SurroundingTextUtil::GetSafeDelta(0, 1, &delta));
  EXPECT_EQ(-1, delta);

  EXPECT_TRUE(SurroundingTextUtil::GetSafeDelta(kSafeInt32MaxAsGUint, 0,
                                                &delta));
  EXPECT_EQ(kSafeInt32MaxAsGUint, delta);
  EXPECT_GE(abs(delta), 0);

  EXPECT_TRUE(SurroundingTextUtil::GetSafeDelta(kSafeInt32MaxAsGUint + 1, 1,
                                                &delta));
  EXPECT_EQ(kSafeInt32MaxAsGUint, delta);
  EXPECT_GE(abs(delta), 0);

  EXPECT_TRUE(SurroundingTextUtil::GetSafeDelta(0, kSafeInt32MaxAsGUint,
                                                &delta));
  EXPECT_EQ(-static_cast<int64>(kSafeInt32MaxAsGUint), delta);
  EXPECT_GE(abs(delta), 0);

  // The result exceeds int32.
  EXPECT_FALSE(SurroundingTextUtil::GetSafeDelta(
      kTooLargeGUint, 0, &delta));

  // The result exceeds int32.
  EXPECT_FALSE(SurroundingTextUtil::GetSafeDelta(
      kTooLargeGUint, 0, &delta));

  // Underflow.
  EXPECT_FALSE(SurroundingTextUtil::GetSafeDelta(
      0, kTooLargeGUint, &delta));

  // The abs(result) exceeds int32.
  EXPECT_FALSE(SurroundingTextUtil::GetSafeDelta(
      static_cast<guint>(-numeric_limits<int32>::min()),
      0, &delta));
}

TEST(SurroundingTextUtilTest, GetAnchorPosFromSelection) {
  guint anchor_pos = 0;

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "abcde", 0, &anchor_pos));
  EXPECT_EQ(5, anchor_pos);

  EXPECT_FALSE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "", "a", 0, &anchor_pos));

  EXPECT_FALSE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "a", "", 0, &anchor_pos));

  EXPECT_FALSE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "aaa", 4, &anchor_pos));

  EXPECT_FALSE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "aaa", 10, &anchor_pos));

  EXPECT_FALSE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "aaaaa", "aaaaaaaaaa", 2, &anchor_pos));

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "abcde", 5, &anchor_pos));
  EXPECT_EQ(0, anchor_pos);

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "bc", 1, &anchor_pos));
  EXPECT_EQ(3, anchor_pos);

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "bcde", 1, &anchor_pos));
  EXPECT_EQ(5, anchor_pos);

  EXPECT_FALSE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "bcdef", 1, &anchor_pos));

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "bc", 3, &anchor_pos));
  EXPECT_EQ(1, anchor_pos);

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "abc", 3, &anchor_pos));
  EXPECT_EQ(0, anchor_pos);

  EXPECT_FALSE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "zabc", 3, &anchor_pos));

  EXPECT_FALSE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "abcde", "_bc", 3, &anchor_pos));

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "aaaa", "a", 1, &anchor_pos));
  EXPECT_EQ(2, anchor_pos);

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "\343\201\202\343\201\204\343\201\206",  // "あいう"
      "\343\201\202\343\201\204\343\201\206",  // "あいう"
      0, &anchor_pos));
  EXPECT_EQ(3, anchor_pos);

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "\343\201\202\343\201\204\343\201\206",  // "あいう"
      "\343\201\202\343\201\204\343\201\206",  // "あいう"
      3, &anchor_pos));
  EXPECT_EQ(0, anchor_pos);

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "\343\201\202\343\201\204\343\201\206",  // "あいう"
      "\343\201\204\343\201\206",              // "いう"
      1, &anchor_pos));
  EXPECT_EQ(3, anchor_pos);

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "\343\201\202\343\201\204\343\201\206",  // "あいう"
      "\343\201\204\343\201\206",              // "いう"
      3, &anchor_pos));
  EXPECT_EQ(1, anchor_pos);

  EXPECT_TRUE(SurroundingTextUtil::GetAnchorPosFromSelection(
      "\343\201\202\343\201\204\343\201\206",  // "あいう"
      "\343\201\202\343\201\204",              // "あい"
      2, &anchor_pos));
  EXPECT_EQ(0, anchor_pos);
}

}  // namespace ibus
}  // namespace mozc