/*
 * Copyright (C) 2010 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.
 */

#ifndef LATINIME_DEFINES_H
#define LATINIME_DEFINES_H

#ifdef __GNUC__
#define AK_FORCE_INLINE __attribute__((always_inline)) __inline__
#else // __GNUC__
#define AK_FORCE_INLINE inline
#endif // __GNUC__

#if defined(FLAG_DO_PROFILE) || defined(FLAG_DBG)
#undef AK_FORCE_INLINE
#define AK_FORCE_INLINE inline
#endif // defined(FLAG_DO_PROFILE) || defined(FLAG_DBG)

// Must be equal to Constants.Dictionary.MAX_WORD_LENGTH in Java
#define MAX_WORD_LENGTH 48
// Must be equal to BinaryDictionary.MAX_RESULTS in Java
#define MAX_RESULTS 18
// Must be equal to ProximityInfo.MAX_PROXIMITY_CHARS_SIZE in Java
#define MAX_PROXIMITY_CHARS_SIZE 16
#define ADDITIONAL_PROXIMITY_CHAR_DELIMITER_CODE 2

#if defined(FLAG_DO_PROFILE) || defined(FLAG_DBG)
#include <android/log.h>
#ifndef LOG_TAG
#define LOG_TAG "LatinIME: "
#endif // LOG_TAG
#define AKLOGE(fmt, ...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, fmt, ##__VA_ARGS__)
#define AKLOGI(fmt, ...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, fmt, ##__VA_ARGS__)

#define DUMP_RESULT(words, frequencies) do { dumpResult(words, frequencies); } while (0)
#define DUMP_WORD(word, length) do { dumpWord(word, length); } while (0)
#define INTS_TO_CHARS(input, length, output) do { \
        intArrayToCharArray(input, length, output); } while (0)

// TODO: Support full UTF-8 conversion
AK_FORCE_INLINE static int intArrayToCharArray(const int *source, const int sourceSize,
        char *dest) {
    int si = 0;
    int di = 0;
    while (si < sourceSize && di < MAX_WORD_LENGTH - 1 && 0 != source[si]) {
        const int codePoint = source[si++];
        if (codePoint < 0x7F) {
            dest[di++] = codePoint;
        } else if (codePoint < 0x7FF) {
            dest[di++] = 0xC0 + (codePoint >> 6);
            dest[di++] = 0x80 + (codePoint & 0x3F);
        } else if (codePoint < 0xFFFF) {
            dest[di++] = 0xE0 + (codePoint >> 12);
            dest[di++] = 0x80 + ((codePoint & 0xFC0) >> 6);
            dest[di++] = 0x80 + (codePoint & 0x3F);
        }
    }
    dest[di] = 0;
    return di;
}

static inline void dumpWordInfo(const int *word, const int length, const int rank,
        const int probability) {
    static char charBuf[50];
    const int N = intArrayToCharArray(word, length, charBuf);
    if (N > 1) {
        AKLOGI("%2d [ %s ] (%d)", rank, charBuf, probability);
    }
}

static inline void dumpResult(const int *outWords, const int *frequencies) {
    AKLOGI("--- DUMP RESULT ---------");
    for (int i = 0; i < MAX_RESULTS; ++i) {
        dumpWordInfo(&outWords[i * MAX_WORD_LENGTH], MAX_WORD_LENGTH, i, frequencies[i]);
    }
    AKLOGI("-------------------------");
}

static AK_FORCE_INLINE void dumpWord(const int *word, const int length) {
    static char charBuf[50];
    const int N = intArrayToCharArray(word, length, charBuf);
    if (N > 1) {
        AKLOGI("[ %s ]", charBuf);
    }
}

#ifndef __ANDROID__
#include <cassert>
#include <execinfo.h>
#include <stdlib.h>

#define DO_ASSERT_TEST
#define ASSERT(success) do { if (!(success)) { showStackTrace(); assert(success);} } while (0)
#define SHOW_STACK_TRACE do { showStackTrace(); } while (0)

static inline void showStackTrace() {
    void *callstack[128];
    int i, frames = backtrace(callstack, 128);
    char **strs = backtrace_symbols(callstack, frames);
    for (i = 0; i < frames; ++i) {
        if (i == 0) {
            AKLOGI("=== Trace ===");
            continue;
        }
        AKLOGI("%s", strs[i]);
    }
    free(strs);
}
#else // __ANDROID__
#include <cassert>
#define DO_ASSERT_TEST
#define ASSERT(success) assert(success)
#define SHOW_STACK_TRACE
#endif // __ANDROID__

#else // defined(FLAG_DO_PROFILE) || defined(FLAG_DBG)
#define AKLOGE(fmt, ...)
#define AKLOGI(fmt, ...)
#define DUMP_RESULT(words, frequencies)
#define DUMP_WORD(word, length)
#undef DO_ASSERT_TEST
#define ASSERT(success)
#define SHOW_STACK_TRACE
#define INTS_TO_CHARS(input, length, output)
#endif // defined(FLAG_DO_PROFILE) || defined(FLAG_DBG)

#ifdef FLAG_DO_PROFILE
// Profiler
#include <time.h>

#define PROF_BUF_SIZE 100
static float profile_buf[PROF_BUF_SIZE];
static float profile_old[PROF_BUF_SIZE];
static unsigned int profile_counter[PROF_BUF_SIZE];

#define PROF_RESET               prof_reset()
#define PROF_COUNT(prof_buf_id)  ++profile_counter[prof_buf_id]
#define PROF_OPEN                do { PROF_RESET; PROF_START(PROF_BUF_SIZE - 1); } while (0)
#define PROF_START(prof_buf_id)  do { \
        PROF_COUNT(prof_buf_id); profile_old[prof_buf_id] = (clock()); } while (0)
#define PROF_CLOSE               do { PROF_END(PROF_BUF_SIZE - 1); PROF_OUTALL; } while (0)
#define PROF_END(prof_buf_id)    profile_buf[prof_buf_id] += ((clock()) - profile_old[prof_buf_id])
#define PROF_CLOCKOUT(prof_buf_id) \
        AKLOGI("%s : clock is %f", __FUNCTION__, (clock() - profile_old[prof_buf_id]))
#define PROF_OUTALL              do { AKLOGI("--- %s ---", __FUNCTION__); prof_out(); } while (0)

static inline void prof_reset(void) {
    for (int i = 0; i < PROF_BUF_SIZE; ++i) {
        profile_buf[i] = 0;
        profile_old[i] = 0;
        profile_counter[i] = 0;
    }
}

static inline void prof_out(void) {
    if (profile_counter[PROF_BUF_SIZE - 1] != 1) {
        AKLOGI("Error: You must call PROF_OPEN before PROF_CLOSE.");
    }
    AKLOGI("Total time is %6.3f ms.",
            profile_buf[PROF_BUF_SIZE - 1] * 1000.0f / static_cast<float>(CLOCKS_PER_SEC));
    float all = 0.0f;
    for (int i = 0; i < PROF_BUF_SIZE - 1; ++i) {
        all += profile_buf[i];
    }
    if (all < 1.0f) all = 1.0f;
    for (int i = 0; i < PROF_BUF_SIZE - 1; ++i) {
        if (profile_buf[i] > 0.0f) {
            AKLOGI("(%d): Used %4.2f%%, %8.4f ms. Called %d times.",
                    i, (profile_buf[i] * 100.0f / all),
                    profile_buf[i] * 1000.0f / static_cast<float>(CLOCKS_PER_SEC),
                    profile_counter[i]);
        }
    }
}

#else // FLAG_DO_PROFILE
#define PROF_BUF_SIZE 0
#define PROF_RESET
#define PROF_COUNT(prof_buf_id)
#define PROF_OPEN
#define PROF_START(prof_buf_id)
#define PROF_CLOSE
#define PROF_END(prof_buf_id)
#define PROF_CLOCK_OUT(prof_buf_id)
#define PROF_CLOCKOUT(prof_buf_id)
#define PROF_OUTALL

#endif // FLAG_DO_PROFILE

#ifdef FLAG_DBG
#define DEBUG_DICT true
#define DEBUG_DICT_FULL false
#define DEBUG_EDIT_DISTANCE false
#define DEBUG_SHOW_FOUND_WORD false
#define DEBUG_NODE DEBUG_DICT_FULL
#define DEBUG_TRACE DEBUG_DICT_FULL
#define DEBUG_PROXIMITY_INFO false
#define DEBUG_PROXIMITY_CHARS false
#define DEBUG_CORRECTION false
#define DEBUG_CORRECTION_FREQ false
#define DEBUG_WORDS_PRIORITY_QUEUE false
#define DEBUG_SAMPLING_POINTS false
#define DEBUG_POINTS_PROBABILITY false
#define DEBUG_DOUBLE_LETTER false
#define DEBUG_CACHE false
#define DEBUG_DUMP_ERROR false
#define DEBUG_EVALUATE_MOST_PROBABLE_STRING false

#ifdef FLAG_FULL_DBG
#define DEBUG_GEO_FULL true
#else
#define DEBUG_GEO_FULL false
#endif

#else // FLAG_DBG

#define DEBUG_DICT false
#define DEBUG_DICT_FULL false
#define DEBUG_EDIT_DISTANCE false
#define DEBUG_SHOW_FOUND_WORD false
#define DEBUG_NODE false
#define DEBUG_TRACE false
#define DEBUG_PROXIMITY_INFO false
#define DEBUG_PROXIMITY_CHARS false
#define DEBUG_CORRECTION false
#define DEBUG_CORRECTION_FREQ false
#define DEBUG_WORDS_PRIORITY_QUEUE false
#define DEBUG_SAMPLING_POINTS false
#define DEBUG_POINTS_PROBABILITY false
#define DEBUG_DOUBLE_LETTER false
#define DEBUG_CACHE false
#define DEBUG_DUMP_ERROR false
#define DEBUG_EVALUATE_MOST_PROBABLE_STRING false

#define DEBUG_GEO_FULL false

#endif // FLAG_DBG

#ifndef S_INT_MAX
#define S_INT_MAX 2147483647 // ((1 << 31) - 1)
#endif
#ifndef S_INT_MIN
// The literal constant -2147483648 does not work in C prior C90, because
// the compiler tries to fit the positive number into an int and then negate it.
// GCC warns about this.
#define S_INT_MIN (-2147483647 - 1) // -(1 << 31)
#endif

#define M_PI_F 3.14159265f
#define MAX_PERCENTILE 100

// Number of base-10 digits in the largest integer + 1 to leave room for a zero terminator.
// As such, this is the maximum number of characters will be needed to represent an int as a
// string, including the terminator; this is used as the size of a string buffer large enough to
// hold any value that is intended to fit in an integer, e.g. in the code that reads the header
// of the binary dictionary where a {key,value} string pair scheme is used.
#define LARGEST_INT_DIGIT_COUNT 11

// Define this to use mmap() for dictionary loading.  Undefine to use malloc() instead of mmap().
// We measured and compared performance of both, and found mmap() is fairly good in terms of
// loading time, and acceptable even for several initial lookups which involve page faults.
#define USE_MMAP_FOR_DICTIONARY

#define NOT_VALID_WORD (-99)
#define NOT_A_CODE_POINT (-1)
#define NOT_A_DISTANCE (-1)
#define NOT_A_COORDINATE (-1)
#define MATCH_CHAR_WITHOUT_DISTANCE_INFO (-2)
#define PROXIMITY_CHAR_WITHOUT_DISTANCE_INFO (-3)
#define ADDITIONAL_PROXIMITY_CHAR_DISTANCE_INFO (-4)
#define NOT_AN_INDEX (-1)
#define NOT_A_PROBABILITY (-1)

#define KEYCODE_SPACE ' '
#define KEYCODE_SINGLE_QUOTE '\''
#define KEYCODE_HYPHEN_MINUS '-'

#define CALIBRATE_SCORE_BY_TOUCH_COORDINATES true
#define SUGGEST_MULTIPLE_WORDS true
#define USE_SUGGEST_INTERFACE_FOR_TYPING true
#define SUGGEST_INTERFACE_OUTPUT_SCALE 1000000.0f

// The following "rate"s are used as a multiplier before dividing by 100, so they are in percent.
#define WORDS_WITH_MISSING_CHARACTER_DEMOTION_RATE 80
#define WORDS_WITH_MISSING_CHARACTER_DEMOTION_START_POS_10X 12
#define WORDS_WITH_MISSING_SPACE_CHARACTER_DEMOTION_RATE 58
#define WORDS_WITH_MISTYPED_SPACE_DEMOTION_RATE 50
#define WORDS_WITH_EXCESSIVE_CHARACTER_DEMOTION_RATE 75
#define WORDS_WITH_EXCESSIVE_CHARACTER_OUT_OF_PROXIMITY_DEMOTION_RATE 75
#define WORDS_WITH_TRANSPOSED_CHARACTERS_DEMOTION_RATE 70
#define FULL_MATCHED_WORDS_PROMOTION_RATE 120
#define WORDS_WITH_PROXIMITY_CHARACTER_DEMOTION_RATE 90
#define WORDS_WITH_ADDITIONAL_PROXIMITY_CHARACTER_DEMOTION_RATE 70
#define WORDS_WITH_MATCH_SKIP_PROMOTION_RATE 105
#define WORDS_WITH_JUST_ONE_CORRECTION_PROMOTION_RATE 148
#define WORDS_WITH_JUST_ONE_CORRECTION_PROMOTION_MULTIPLIER 3
#define CORRECTION_COUNT_RATE_DEMOTION_RATE_BASE 45
#define INPUT_EXCEEDS_OUTPUT_DEMOTION_RATE 70
#define FIRST_CHAR_DIFFERENT_DEMOTION_RATE 96
#define TWO_WORDS_CAPITALIZED_DEMOTION_RATE 50
#define TWO_WORDS_CORRECTION_DEMOTION_BASE 80
#define TWO_WORDS_PLUS_OTHER_ERROR_CORRECTION_DEMOTION_DIVIDER 1
#define ZERO_DISTANCE_PROMOTION_RATE 110.0f
#define NEUTRAL_SCORE_SQUARED_RADIUS 8.0f
#define HALF_SCORE_SQUARED_RADIUS 32.0f
#define MAX_PROBABILITY 255
#define MAX_BIGRAM_ENCODED_PROBABILITY 15

// Assuming locale strings such as en_US, sr-Latn etc.
#define MAX_LOCALE_STRING_LENGTH 10

// Word limit for sub queues used in WordsPriorityQueuePool.  Sub queues are temporary queues used
// for better performance.
// Holds up to 1 candidate for each word
#define SUB_QUEUE_MAX_WORDS 1
#define SUB_QUEUE_MAX_COUNT 10
#define SUB_QUEUE_MIN_WORD_LENGTH 4
// TODO: Extend this limitation
#define MULTIPLE_WORDS_SUGGESTION_MAX_WORDS 5
// TODO: Remove this limitation
#define MULTIPLE_WORDS_SUGGESTION_MAX_WORD_LENGTH 12
// TODO: Remove this limitation
#define MULTIPLE_WORDS_SUGGESTION_MAX_TOTAL_TRAVERSE_COUNT 45
#define MULTIPLE_WORDS_DEMOTION_RATE 80
#define MIN_INPUT_LENGTH_FOR_THREE_OR_MORE_WORDS_CORRECTION 6

#define TWO_WORDS_CORRECTION_WITH_OTHER_ERROR_THRESHOLD 0.35f
#define START_TWO_WORDS_CORRECTION_THRESHOLD 0.185f
/* heuristic... This should be changed if we change the unit of the probability. */
#define SUPPRESS_SHORT_MULTIPLE_WORDS_THRESHOLD_FREQ (MAX_PROBABILITY * 58 / 100)

#define MAX_DEPTH_MULTIPLIER 3
#define FIRST_WORD_INDEX 0

// Max value for length, distance and probability which are used in weighting
// TODO: Remove
#define MAX_VALUE_FOR_WEIGHTING 10000000

// The max number of the keys in one keyboard layout
#define MAX_KEY_COUNT_IN_A_KEYBOARD 64

// TODO: Reduce this constant if possible; check the maximum number of digraphs in the same
// word in the dictionary for languages with digraphs, like German and French
#define DEFAULT_MAX_DIGRAPH_SEARCH_DEPTH 5

#define MIN_USER_TYPED_LENGTH_FOR_MULTIPLE_WORD_SUGGESTION 3

// TODO: Remove
#define MAX_POINTER_COUNT 1
#define MAX_POINTER_COUNT_G 2

// Size, in bytes, of the bloom filter index for bigrams
// 128 gives us 1024 buckets. The probability of false positive is (1 - e ** (-kn/m))**k,
// where k is the number of hash functions, n the number of bigrams, and m the number of
// bits we can test.
// At the moment 100 is the maximum number of bigrams for a word with the current
// dictionaries, so n = 100. 1024 buckets give us m = 1024.
// With 1 hash function, our false positive rate is about 9.3%, which should be enough for
// our uses since we are only using this to increase average performance. For the record,
// k = 2 gives 3.1% and k = 3 gives 1.6%. With k = 1, making m = 2048 gives 4.8%,
// and m = 4096 gives 2.4%.
#define BIGRAM_FILTER_BYTE_SIZE 128
// Must be smaller than BIGRAM_FILTER_BYTE_SIZE * 8, and preferably prime. 1021 is the largest
// prime under 128 * 8.
#define BIGRAM_FILTER_MODULO 1021
#if BIGRAM_FILTER_BYTE_SIZE * 8 < BIGRAM_FILTER_MODULO
#error "BIGRAM_FILTER_MODULO is larger than BIGRAM_FILTER_BYTE_SIZE"
#endif

// Max number of bigram maps (previous word contexts) to be cached. Increasing this number could
// improve bigram lookup speed for multi-word suggestions, but at the cost of more memory usage.
// Also, there are diminishing returns since the most frequently used bigrams are typically near
// the beginning of the input and are thus the first ones to be cached. Note that these bigrams
// are reset for each new composing word.
#define MAX_CACHED_PREV_WORDS_IN_BIGRAM_MAP 25
// Most common previous word contexts currently have 100 bigrams
#define DEFAULT_HASH_MAP_SIZE_FOR_EACH_BIGRAM_MAP 100

template<typename T> AK_FORCE_INLINE const T &min(const T &a, const T &b) { return a < b ? a : b; }
template<typename T> AK_FORCE_INLINE const T &max(const T &a, const T &b) { return a > b ? a : b; }

#define NELEMS(x) (sizeof(x) / sizeof((x)[0]))

// DEBUG
#define INPUTLENGTH_FOR_DEBUG (-1)
#define MIN_OUTPUT_INDEX_FOR_DEBUG (-1)

#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
  TypeName(const TypeName&);               \
  void operator=(const TypeName&)

#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
  TypeName();                                    \
  DISALLOW_COPY_AND_ASSIGN(TypeName)

// Used as a return value for character comparison
typedef enum {
    // Same char, possibly with different case or accent
    MATCH_CHAR,
    // It is a char located nearby on the keyboard
    PROXIMITY_CHAR,
    // Additional proximity char which can differ by language.
    ADDITIONAL_PROXIMITY_CHAR,
    // It is a substitution char
    SUBSTITUTION_CHAR,
    // It is an unrelated char
    UNRELATED_CHAR,
} ProximityType;

typedef enum {
    NOT_A_DOUBLE_LETTER,
    A_DOUBLE_LETTER,
    A_STRONG_DOUBLE_LETTER
} DoubleLetterLevel;

typedef enum {
    // Correction for MATCH_CHAR
    CT_MATCH,
    // Correction for PROXIMITY_CHAR
    CT_PROXIMITY,
    // Correction for ADDITIONAL_PROXIMITY_CHAR
    CT_ADDITIONAL_PROXIMITY,
    // Correction for SUBSTITUTION_CHAR
    CT_SUBSTITUTION,
    // Skip one omitted letter
    CT_OMISSION,
    // Delete an unnecessarily inserted letter
    CT_INSERTION,
    // Swap the order of next two touch points
    CT_TRANSPOSITION,
    CT_COMPLETION,
    CT_TERMINAL,
    // Create new word with space omission
    CT_NEW_WORD_SPACE_OMITTION,
    // Create new word with space substitution
    CT_NEW_WORD_SPACE_SUBSTITUTION,
} CorrectionType;

// ErrorType is mainly decided by CorrectionType but it is also depending on if
// the correction has really been performed or not.
typedef enum {
    // Substitution, omission and transposition
    ET_EDIT_CORRECTION,
    // Proximity error
    ET_PROXIMITY_CORRECTION,
    // Completion
    ET_COMPLETION,
    // New word
    // TODO: Remove.
    // A new word error should be an edit correction error or a proximity correction error.
    ET_NEW_WORD,
    // Treat error as an intentional omission when the CorrectionType is omission and the node can
    // be intentional omission.
    ET_INTENTIONAL_OMISSION,
    // Not treated as an error. Tracked for checking exact match
    ET_NOT_AN_ERROR
} ErrorType;
#endif // LATINIME_DEFINES_H