/* SPDX-License-Identifier: GPL-2.0 */

/* https://cs.wikipedia.org/wiki/Wikipedie:Transkripce_hindštiny */

#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "iast-czech.h"
#include "transliteration.h"


static const struct transliteration_letter table[] = {

	/* Vowels */
	{0x0905, FLAG_REGULAR, "a"},		/* अ */		/* 1 */
	{0x0906, FLAG_REGULAR, "á"},		/* आ */		/* 2 */
	{0x0907, FLAG_REGULAR, "i"},		/* इ */		/* 3 */
	{0x0908, FLAG_REGULAR, "í"},		/* ई */		/* 4 */
	{0x0909, FLAG_REGULAR, "u"},		/* उ */		/* 5 */
	{0x090a, FLAG_REGULAR, "ú"},		/* ऊ */		/* 6 */
	{0x090b, FLAG_REGULAR, "r"},		/* ऋ */		/* 7 */
	{0x0960, FLAG_REGULAR, "r"},		/* ॠ */		/* 8 */
	{0x090c, FLAG_REGULAR, "l"},		/* ऌ */		/* 9 */
	{0x0961, FLAG_REGULAR, "l"},		/* ॡ */		/* 10 */
	{0x090f, FLAG_REGULAR, "é"},		/* ए */		/* 11 */
	{0x0910, FLAG_REGULAR, "ai"},		/* ऐ */		/* 12 */
	{0x0913, FLAG_REGULAR, "ó"},		/* ओ */		/* 13 */
	{0x0914, FLAG_REGULAR, "au"},		/* औ */		/* 14 */

	/* Consonants */
	{0x0915, FLAG_REGULAR, "ka"},		/* क */		/* 1 */
	{0x0916, FLAG_REGULAR, "kha"},		/* ख */		/* 2 */
	{0x0917, FLAG_REGULAR, "ga"},		/* ग */		/* 3 */
	{0x0918, FLAG_REGULAR, "gha"},		/* घ */		/* 4 */
	{0x0919, FLAG_REGULAR, "na"},		/* ङ */		/* 5 */
	{0x0939, FLAG_REGULAR, "ha"},		/* ह */		/* 6 */
	{0x091a, FLAG_REGULAR, "ca"},		/* च */		/* 7 */
	{0x091b, FLAG_REGULAR, "cha"},		/* छ */		/* 8 */
	{0x091c, FLAG_REGULAR, "dža"},		/* ज */		/* 9 */
	{0x091d, FLAG_REGULAR, "džha"},		/* झ */		/* 10 */
	{0x091e, FLAG_REGULAR, "ňa"},		/* ञ */		/* 11 */
	{0x092f, FLAG_REGULAR, "ja"},		/* य */		/* 12 */
	{0x0936, FLAG_REGULAR, "ša"},		/* श */		/* 13 */
	{0x091F, FLAG_REGULAR, "ta"},		/* ट */		/* 14 */
	{0x0920, FLAG_REGULAR, "tha"},		/* ठ */		/* 15 */
	{0x0921, FLAG_REGULAR, "da"},		/* ड */		/* 16 */
	{0x0922, FLAG_REGULAR, "dha"},		/* ढ */		/* 17 */
	{0x0923, FLAG_REGULAR, "na"},		/* ण */		/* 18 */
	{0x0930, FLAG_REGULAR, "ra"},		/* र */		/* 19 */
	{0x0937, FLAG_REGULAR, "ša"},		/* श */		/* 20 */
	{0x0924, FLAG_REGULAR, "ta"},		/* त */		/* 21 */
	{0x0925, FLAG_REGULAR, "tha"},		/* थ */		/* 22 */
	{0x0926, FLAG_REGULAR, "da"},		/* द */		/* 23 */
	{0x0927, FLAG_REGULAR, "dha"},		/* ध */		/* 24 */
	{0x0928, FLAG_REGULAR, "na"},		/* न */		/* 25 */
	{0x0932, FLAG_REGULAR, "la"},		/* ल */		/* 26 */
	{0x0938, FLAG_REGULAR, "sa"},		/* स */		/* 27 */
	{0x092a, FLAG_REGULAR, "pa"},		/* प */		/* 28 */
	{0x092b, FLAG_REGULAR, "pha"},		/* फ */		/* 29 */
	{0x092c, FLAG_REGULAR, "ba"},		/* ब */		/* 30 */
	{0x092d, FLAG_REGULAR, "bha"},		/* भ */		/* 31 */
	{0x092e, FLAG_REGULAR, "ma"},		/* म */		/* 32 */
	{0x0935, FLAG_REGULAR, "va"},		/* व */		/* 33 */

	/* Codas */
	{0x0902, FLAG_REGULAR, "m"},		/* ं (anusvara) */
	{0x0903, FLAG_REGULAR, ""},		/* ः (visarga)  */
	{0x093d, FLAG_REGULAR, "'"},		/* ऽ (avagrada) */

	/* Special characters */
	{0x0950, FLAG_REGULAR, "óm"},		/* ॐ */

	/* Numbers */
	{0x0966, FLAG_REGULAR, "0"},
	{0x0967, FLAG_REGULAR, "1"},
	{0x0968, FLAG_REGULAR, "2"},
	{0x0969, FLAG_REGULAR, "3"},
	{0x096a, FLAG_REGULAR, "4"},
	{0x096b, FLAG_REGULAR, "5"},
	{0x096c, FLAG_REGULAR, "6"},
	{0x096d, FLAG_REGULAR, "7"},
	{0x096e, FLAG_REGULAR, "8"},
	{0x096f, FLAG_REGULAR, "9"},

	/* Diacritic modifiers */
	{0x093e, FLAG_MODIFIER, "á"},		/* ा */
	{0x093f, FLAG_MODIFIER, "i"},		/* ि */
	{0x0940, FLAG_MODIFIER, "í"},		/* ी */
	{0x0941, FLAG_MODIFIER, "u"},		/* ु */
	{0x0942, FLAG_MODIFIER, "ú"},		/* ू */
	{0x0943, FLAG_MODIFIER, "r"},		/* ृ */
	{0x0944, FLAG_MODIFIER, "r"},		/* ॄ */
	{0x0962, FLAG_MODIFIER, "l"},		/* ॢ */
	{0x0963, FLAG_MODIFIER, "l"},		/* ॣ */
	{0x0947, FLAG_MODIFIER, "é"},		/* े */
	{0x0948, FLAG_MODIFIER, "ai"},		/* ै */
	{0x094b, FLAG_MODIFIER, "ó"},		/* ो */
	{0x094c, FLAG_MODIFIER, "au"},		/* ौ */
	{0x094d, FLAG_MODIFIER, ""},		/* ् (virama) */

	{0, 0, NULL}
};

static void nasal_consonants_filter(struct syllable *chain)
{
	struct syllable *syllable = chain;

	while (syllable) {
		if (is_devanagari(syllable->code) && strcmp(syllable->data, "n") == 0) {
			if (syllable->next != NULL) {
				if (syllable->next->data[0] == 'p' ||
				    syllable->next->data[0] == 'b' ||
				    syllable->next->data[0] == 'm') {
					free(syllable->data);
					syllable->data = strdup("m");
				}
			}
		}

		if (is_devanagari(syllable->code) && strcmp(syllable->data, "m") == 0) {
			if (syllable->next != NULL) {
				if (syllable->next->data[0] != 'p' &&
				    syllable->next->data[0] != 'b' &&
				    syllable->next->data[0] != 'm') {
					free(syllable->data);
					syllable->data = strdup("n");
				}
			}
		}


		syllable = syllable->next;
	}
}

static void end_of_word_filter(struct syllable *chain)
{
	struct syllable *syllable = chain;
	unsigned int n;

	while (syllable) {
		if (syllable->next == NULL || isspace(syllable->next->data[0])) {
			if (!strcmp(syllable->data, "m")) {
				free(syllable->data);
				syllable->data = strdup("");
			}

			n = strlen(syllable->data);
			if (!strcmp(syllable->data + n - 2, "á")) {
				syllable->data[n - 2] = 'a';
				syllable->data[n - 1] = '\0';
			}
		}

		syllable = syllable->next;
	}
}

static const transliteration_filter_t filters[] = {
	nasal_consonants_filter,
	end_of_word_filter,
	NULL
};

static const struct transliteration_context context = {
	.table = table,
	.filters = filters
};

const struct transliteration_context *get_iast_czech_transliteration_context()
{
	return &context;
}