// Copyright 2020 @ridingqwerty
// Copyright 2020 @tzarc
// Copyright 2021 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
// SPDX-License-Identifier: GPL-2.0-or-later

#include "drashna.h"
#include "process_unicode_common.h"

uint16_t typing_mode;

void tap_unicode_glyph_nomods(uint32_t glyph) {
    uint8_t temp_mod = get_mods();
    clear_mods();
    clear_oneshot_mods();
    register_unicode(glyph);
    set_mods(temp_mod);
}

typedef uint32_t (*translator_function_t)(bool is_shifted, uint32_t keycode);

#define DEFINE_UNICODE_RANGE_TRANSLATOR(translator_name, lower_alpha, upper_alpha, zero_glyph, number_one, space_glyph) \
    static inline uint32_t translator_name(bool is_shifted, uint32_t keycode) {                                         \
        switch (keycode) {                                                                                              \
            case KC_A ... KC_Z:                                                                                         \
                return (is_shifted ? upper_alpha : lower_alpha) + keycode - KC_A;                                       \
            case KC_0:                                                                                                  \
                return zero_glyph;                                                                                      \
            case KC_1 ... KC_9:                                                                                         \
                return (number_one + keycode - KC_1);                                                                   \
            case KC_SPACE:                                                                                              \
                return space_glyph;                                                                                     \
        }                                                                                                               \
        return keycode;                                                                                                 \
    }

#define DEFINE_UNICODE_LUT_TRANSLATOR(translator_name, ...)                     \
    static inline uint32_t translator_name(bool is_shifted, uint32_t keycode) { \
        static const uint32_t translation[] = {__VA_ARGS__};                    \
        uint32_t              ret           = keycode;                          \
        if ((keycode - KC_A) < (sizeof(translation) / sizeof(uint32_t))) {      \
            ret = translation[keycode - KC_A];                                  \
        }                                                                       \
        return ret;                                                             \
    }

bool process_record_glyph_replacement(uint16_t keycode, keyrecord_t *record, translator_function_t translator) {
    uint8_t temp_mod   = get_mods();
    uint8_t temp_osm   = get_oneshot_mods();
    bool    is_shifted = (temp_mod | temp_osm) & MOD_MASK_SHIFT;
    if (((temp_mod | temp_osm) & (MOD_MASK_CTRL | MOD_MASK_ALT | MOD_MASK_GUI)) == 0) {
        if (KC_A <= keycode && keycode <= KC_Z) {
            if (record->event.pressed) {
                tap_unicode_glyph_nomods(translator(is_shifted, keycode));
            }
            return false;
        } else if (KC_1 <= keycode && keycode <= KC_0) {
            if (is_shifted) {  // skip shifted numbers, so that we can still use symbols etc.
                return process_record_keymap(keycode, record);
            }
            if (record->event.pressed) {
                register_unicode(translator(is_shifted, keycode));
            }
            return false;
        } else if (keycode == KC_SPACE) {
            if (record->event.pressed) {
                register_unicode(translator(is_shifted, keycode));
            }
            return false;
        }
    }
    return true;
}

DEFINE_UNICODE_RANGE_TRANSLATOR(unicode_range_translator_wide, 0xFF41, 0xFF21, 0xFF10, 0xFF11, 0x2003);
DEFINE_UNICODE_RANGE_TRANSLATOR(unicode_range_translator_script, 0x1D4EA, 0x1D4D0, 0x1D7CE, 0x1D7C1, 0x2002);
DEFINE_UNICODE_RANGE_TRANSLATOR(unicode_range_translator_boxes, 0x1F170, 0x1F170, '0', '1', 0x2002);
DEFINE_UNICODE_RANGE_TRANSLATOR(unicode_range_translator_regional, 0x1F1E6, 0x1F1E6, '0', '1', 0x2003);

DEFINE_UNICODE_LUT_TRANSLATOR(unicode_lut_translator_aussie,
                              0x0250,  // a
                              'q',     // b
                              0x0254,  // c
                              'p',     // d
                              0x01DD,  // e
                              0x025F,  // f
                              0x0183,  // g
                              0x0265,  // h
                              0x1D09,  // i
                              0x027E,  // j
                              0x029E,  // k
                              'l',     // l
                              0x026F,  // m
                              'u',     // n
                              'o',     // o
                              'd',     // p
                              'b',     // q
                              0x0279,  // r
                              's',     // s
                              0x0287,  // t
                              'n',     // u
                              0x028C,  // v
                              0x028D,  // w
                              0x2717,  // x
                              0x028E,  // y
                              'z',     // z
                              0x0269,  // 1
                              0x3139,  // 2
                              0x0190,  // 3
                              0x3123,  // 4
                              0x03DB,  // 5
                              '9',     // 6
                              0x3125,  // 7
                              '8',     // 8
                              '6',     // 9
                              '0'      // 0
);

bool process_record_aussie(uint16_t keycode, keyrecord_t *record) {
    bool is_shifted = (get_mods() | get_oneshot_mods()) & MOD_MASK_SHIFT;
    if ((KC_A <= keycode) && (keycode <= KC_0)) {
        if (record->event.pressed) {
            if (!process_record_glyph_replacement(keycode, record, unicode_lut_translator_aussie)) {
                tap_code16_nomods(KC_LEFT);
                return false;
            }
        }
    } else if (record->event.pressed && keycode == KC_SPACE) {
        tap_code16_nomods(KC_SPACE);
        tap_code16_nomods(KC_LEFT);
        return false;
    } else if (record->event.pressed && keycode == KC_ENTER) {
        tap_code16_nomods(KC_END);
        tap_code16_nomods(KC_ENTER);
        return false;
    } else if (record->event.pressed && keycode == KC_HOME) {
        tap_code16_nomods(KC_END);
        return false;
    } else if (record->event.pressed && keycode == KC_END) {
        tap_code16_nomods(KC_HOME);
        return false;
    } else if (record->event.pressed && keycode == KC_BSPC) {
        tap_code16_nomods(KC_DELT);
        return false;
    } else if (record->event.pressed && keycode == KC_DELT) {
        tap_code16_nomods(KC_BSPC);
        return false;
    } else if (record->event.pressed && keycode == KC_QUOT) {
        tap_unicode_glyph_nomods(is_shifted ? 0x201E : 0x201A);
        tap_code16_nomods(KC_LEFT);
        return false;
    } else if (record->event.pressed && keycode == KC_COMMA) {
        tap_unicode_glyph_nomods(is_shifted ? '<' : 0x2018);
        tap_code16_nomods(KC_LEFT);
        return false;
    } else if (record->event.pressed && keycode == KC_DOT) {
        tap_unicode_glyph_nomods(is_shifted ? '>' : 0x02D9);
        tap_code16_nomods(KC_LEFT);
        return false;
    } else if (record->event.pressed && keycode == KC_SLASH) {
        tap_unicode_glyph_nomods(is_shifted ? 0x00BF : '/');
        tap_code16_nomods(KC_LEFT);
        return false;
    }
    return true;
}

bool process_record_zalgo(uint16_t keycode, keyrecord_t *record) {
    if ((KC_A <= keycode) && (keycode <= KC_0)) {
        if (record->event.pressed) {

            tap_code16_nomods(keycode);

            int number = (rand() % (8 + 1 - 2)) + 2;
            for (int index = 0; index < number; index++) {
                uint16_t hex = (rand() % (0x036F + 1 - 0x0300)) + 0x0300;
                register_unicode(hex);
            }

            return false;
        }
    }
    return true;
}

bool process_record_unicode(uint16_t keycode, keyrecord_t *record) {
    switch (keycode) {
        case UC_FLIP:  // (ノಠ痊ಠ)ノ彡┻━┻
            if (record->event.pressed) {
                send_unicode_string("(ノಠ痊ಠ)ノ彡┻━┻");
            }
            break;

        case UC_TABL:  // ┬─┬ノ( º _ ºノ)
            if (record->event.pressed) {
                send_unicode_string("┬─┬ノ( º _ ºノ)");
            }
            break;

        case UC_SHRG:  // ¯\_(ツ)_/¯
            if (record->event.pressed) {
                send_unicode_string("¯\\_(ツ)_/¯");
            }
            break;

        case UC_DISA:  // ಠ_ಠ
            if (record->event.pressed) {
                send_unicode_string("ಠ_ಠ");
            }
            break;

        case UC_IRNY:  // ⸮
            if (record->event.pressed) {
                register_unicode(0x2E2E);
            }
            break;
        case UC_CLUE:  // ‽
            if (record->event.pressed) {
                register_unicode(0x203D);
            }
            break;
        case KC_NOMODE ... KC_ZALGO:
            if (record->event.pressed) {
                if (typing_mode != keycode) {
                    typing_mode = keycode;
                } else {
                    typing_mode = 0;
                }
            }
            break;
    }

    if (((get_mods() | get_oneshot_mods()) & ~MOD_MASK_SHIFT) != 0) {
        return true;
    }

    if (((keycode >= QK_MOD_TAP && keycode <= QK_MOD_TAP_MAX) || (keycode >= QK_LAYER_TAP && keycode <= QK_LAYER_TAP_MAX)) && record->tap.count) {
        keycode &= 0xFF;
    }

    if (typing_mode == KC_WIDE) {
        if (((KC_A <= keycode) && (keycode <= KC_0)) || keycode == KC_SPACE) {
            return process_record_glyph_replacement(keycode, record, unicode_range_translator_wide);
        }
    } else if (typing_mode == KC_SCRIPT) {
        if (((KC_A <= keycode) && (keycode <= KC_0)) || keycode == KC_SPACE) {
            return process_record_glyph_replacement(keycode, record, unicode_range_translator_script);
        }
    } else if (typing_mode == KC_BLOCKS) {
        if (((KC_A <= keycode) && (keycode <= KC_0)) || keycode == KC_SPACE) {
            return process_record_glyph_replacement(keycode, record, unicode_range_translator_boxes);
        }
    } else if (typing_mode == KC_REGIONAL) {
        if (((KC_A <= keycode) && (keycode <= KC_0)) || keycode == KC_SPACE) {
            if (!process_record_glyph_replacement(keycode, record, unicode_range_translator_regional)) {
                wait_us(500);
                tap_unicode_glyph_nomods(0x200C);
                return false;
            }
        }
    } else if (typing_mode == KC_AUSSIE) {
        return process_record_aussie(keycode, record);
    } else if (typing_mode == KC_ZALGO) {
        return process_record_zalgo(keycode, record);
    }
    return process_unicode_common(keycode, record);
}

void matrix_init_unicode(void) {
    unicode_input_mode_init();
}
