/*************************************************************************/
/*  resource_importer_imagefont.cpp                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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#include "resource_importer_imagefont.h"

#include "core/io/image_loader.h"
#include "core/io/resource_saver.h"

String ResourceImporterImageFont::get_importer_name() const {
	return "font_data_image";
}

String ResourceImporterImageFont::get_visible_name() const {
	return "Font Data (Monospace Image Font)";
}

void ResourceImporterImageFont::get_recognized_extensions(List<String> *p_extensions) const {
	if (p_extensions) {
		ImageLoader::get_recognized_extensions(p_extensions);
	}
}

String ResourceImporterImageFont::get_save_extension() const {
	return "fontdata";
}

String ResourceImporterImageFont::get_resource_type() const {
	return "FontFile";
}

bool ResourceImporterImageFont::get_option_visibility(const String &p_path, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
	return true;
}

void ResourceImporterImageFont::get_import_options(const String &p_path, List<ImportOption> *r_options, int p_preset) const {
	r_options->push_back(ImportOption(PropertyInfo(Variant::PACKED_STRING_ARRAY, "character_ranges"), Vector<String>()));
	r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "columns"), 1));
	r_options->push_back(ImportOption(PropertyInfo(Variant::INT, "rows"), 1));
	r_options->push_back(ImportOption(PropertyInfo(Variant::RECT2I, "image_margin"), Rect2i()));
	r_options->push_back(ImportOption(PropertyInfo(Variant::RECT2I, "character_margin"), Rect2i()));

	r_options->push_back(ImportOption(PropertyInfo(Variant::ARRAY, "fallbacks", PROPERTY_HINT_ARRAY_TYPE, MAKE_RESOURCE_TYPE_HINT("Font")), Array()));

	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "compress"), true));
}

bool ResourceImporterImageFont::_decode_range(const String &p_token, int32_t &r_pos) {
	if (p_token.begins_with("U+") || p_token.begins_with("u+") || p_token.begins_with("0x")) {
		// Unicode character hex index.
		r_pos = p_token.substr(2).hex_to_int();
		return true;
	} else if (p_token.length() == 3 && p_token[0] == '\'' && p_token[2] == '\'') {
		// Unicode character.
		r_pos = p_token.unicode_at(1);
		return true;
	} else if (p_token.is_numeric()) {
		// Unicode character decimal index.
		r_pos = p_token.to_int();
		return true;
	} else {
		return false;
	}
}

Error ResourceImporterImageFont::import(const String &p_source_file, const String &p_save_path, const HashMap<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files, Variant *r_metadata) {
	print_verbose("Importing image font from: " + p_source_file);

	int columns = p_options["columns"];
	int rows = p_options["rows"];
	Vector<String> ranges = p_options["character_ranges"];
	Array fallbacks = p_options["fallbacks"];
	Rect2i img_margin = p_options["image_margin"];
	Rect2i char_margin = p_options["character_margin"];

	Ref<Image> img;
	img.instantiate();
	Error err = ImageLoader::load_image(p_source_file, img);
	ERR_FAIL_COND_V_MSG(err != OK, ERR_FILE_CANT_READ, TTR("Can't load font texture:") + " \"" + p_source_file + "\".");

	int count = columns * rows;
	int chr_cell_width = (img->get_width() - img_margin.position.x - img_margin.size.x) / columns;
	int chr_cell_height = (img->get_height() - img_margin.position.y - img_margin.size.y) / rows;
	ERR_FAIL_COND_V_MSG(chr_cell_width <= 0 || chr_cell_height <= 0, ERR_FILE_CANT_READ, TTR("Image margin too big."));

	int chr_width = chr_cell_width - char_margin.position.x - char_margin.size.x;
	int chr_height = chr_cell_height - char_margin.position.y - char_margin.size.y;
	ERR_FAIL_COND_V_MSG(chr_width <= 0 || chr_height <= 0, ERR_FILE_CANT_READ, TTR("Character margin too bit."));

	Ref<FontFile> font;
	font.instantiate();
	font->set_antialiasing(TextServer::FONT_ANTIALIASING_NONE);
	font->set_generate_mipmaps(false);
	font->set_multichannel_signed_distance_field(false);
	font->set_fixed_size(chr_height);
	font->set_subpixel_positioning(TextServer::SUBPIXEL_POSITIONING_DISABLED);
	font->set_force_autohinter(false);
	font->set_allow_system_fallback(false);
	font->set_hinting(TextServer::HINTING_NONE);
	font->set_oversampling(1.0f);
	font->set_fallbacks(fallbacks);
	font->set_texture_image(0, Vector2i(chr_height, 0), 0, img);

	int pos = 0;
	for (int i = 0; i < ranges.size(); i++) {
		int32_t start, end;
		Vector<String> tokens = ranges[i].split("-");
		if (tokens.size() == 2) {
			if (!_decode_range(tokens[0], start) || !_decode_range(tokens[1], end)) {
				WARN_PRINT("Invalid range: \"" + ranges[i] + "\"");
				continue;
			}
		} else if (tokens.size() == 1) {
			if (!_decode_range(tokens[0], start)) {
				WARN_PRINT("Invalid range: \"" + ranges[i] + "\"");
				continue;
			}
			end = start;
		} else {
			WARN_PRINT("Invalid range: \"" + ranges[i] + "\"");
			continue;
		}
		for (int32_t idx = start; idx <= end; idx++) {
			int x = pos % columns;
			int y = pos / columns;
			font->set_glyph_advance(0, chr_height, idx, Vector2(chr_width, 0));
			font->set_glyph_offset(0, Vector2i(chr_height, 0), idx, Vector2(0, -0.5 * chr_height));
			font->set_glyph_size(0, Vector2i(chr_height, 0), idx, Vector2(chr_width, chr_height));
			font->set_glyph_uv_rect(0, Vector2i(chr_height, 0), idx, Rect2(img_margin.position.x + chr_cell_width * x + char_margin.position.x, img_margin.position.y + chr_cell_height * y + char_margin.position.y, chr_width, chr_height));
			font->set_glyph_texture_idx(0, Vector2i(chr_height, 0), idx, 0);
			pos++;
			ERR_FAIL_COND_V_MSG(pos >= count, ERR_CANT_CREATE, "Too many characters in range, should be " + itos(columns * rows));
		}
	}
	font->set_cache_ascent(0, chr_height, 0.5 * chr_height);
	font->set_cache_descent(0, chr_height, 0.5 * chr_height);

	int flg = 0;
	if ((bool)p_options["compress"]) {
		flg |= ResourceSaver::SaverFlags::FLAG_COMPRESS;
	}

	print_verbose("Saving to: " + p_save_path + ".fontdata");
	err = ResourceSaver::save(font, p_save_path + ".fontdata", flg);
	ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot save font to file \"" + p_save_path + ".res\".");
	print_verbose("Done saving to: " + p_save_path + ".fontdata");
	return OK;
}

ResourceImporterImageFont::ResourceImporterImageFont() {
}