/*
 * Copyright (C) 2022 V-Gears Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include "decompiler/instruction/KernelCallInstruction.h"
#include "decompiler/field/FieldEngine.h"

namespace FF7{

    /**
     * A walkmesh instruction.
     */
    class FieldWalkmeshInstruction : public KernelCallInstruction{

        public:

            /**
             * Processes the instruction.
             *
             * @param func[in] Function to process.
             * @param stack[out] Function stack.
             * @param engine[in] Engine. Unused.
             * @param codegen[in|out] Code generator to append lines.
             */
            virtual void ProcessInst(
              Function& func, ValueStack &stack, Engine *engine, CodeGenerator *code_gen
            ) override;

        private:

            void ProcessUC(CodeGenerator* code_gen);

            /**
             * Processes a LINE opcode.
             *
             * Opcode: 0xD0
             * Short name: LINE
             * Long name: Line definition
             *
             * Memory layout (7 bytes)
             * |0xD0|XA|YA|ZA|XB|YB|ZB|
             *
             * Arguments:
             * - const Short XA: X-coordinate of the first point of the line.
             * - const Short YA: Y-coordinate of the first point of the line.
             * - const Short ZA: Z-coordinate of the first point of the line.
             * - const Short XB: X-coordinate of the second point of the line.
             * - const Short YB: Y-coordinate of the second point of the line.
             * - const Short ZB: Z-coordinate of the second point of the line.
             *
             * Defines a line on the walkmesh that, when crossed by a playable
             * character, causes one of the entity's scripts to be executed.
             * These are similar to the triggers in Section 8. All the lines
             * in the current field can be turned on or off by using the LINON
             * opcode.
             *
             * There are generally 6 scripts (other than the init and main) if
             * the entity is a LINE.
             * - script index 2 -> S1 - [OK].
             * - script index 3 -> S2 - Move.
             * - script index 4 -> S3 - Move.
             * - script index 5 -> S4 - Go.
             * - script index 6 -> S5 - Go 1x.
             * - script index 7 -> S6 - Go away.
             *
             * @param codegen[in|out] Code generator to append lines.
             * @param entity[in] The entity name.
             */
            void ProcessLINE(CodeGenerator* code_gen, const std::string& entity);
    };

}