#include "codegen.h"

#include <mie/block.h>
#include <mie/func.h>
#include <mie/module.h>

struct for_codegen_state {
	struct code_generator_state s_base;
	struct mie_value *s_iterator;
	struct mie_value *s_container;
};

static struct code_generator_result gen_expr(
	struct ivy_codegen *gen, struct code_generator_state *state,
	struct ivy_ast_node *node, size_t depth)
{
	struct for_codegen_state *for_loop = (struct for_codegen_state *)state;

	codegen_push_generator(gen, CODE_GENERATOR_EXPR, 0, NULL);
	return CODEGEN_RESULT_OK(CODEGEN_R_REPEAT_NODE);
}

static struct code_generator_result gen_block(
	struct ivy_codegen *gen, struct code_generator_state *state,
	struct ivy_ast_node *node, size_t depth)
{
	codegen_push_generator(gen, CODE_GENERATOR_BLOCK, 0, NULL);
	return CODEGEN_RESULT_OK(0);
}

static enum ivy_status state_init(
	struct ivy_codegen *gen, struct code_generator_state *state,
	uintptr_t argv, void *argp)
{
	return IVY_OK;
}

static enum ivy_status state_fini(
	struct ivy_codegen *gen, struct code_generator_state *state,
	struct mie_value **result)
{
	return IVY_OK;
}

static struct code_generator_result value_received(
	struct ivy_codegen *gen, struct code_generator_state *state,
	struct mie_value *value)
{
	struct for_codegen_state *for_loop = (struct for_codegen_state *)state;

	if (!for_loop->s_iterator) {
		for_loop->s_iterator = value;
	} else if (!for_loop->s_container) {
		for_loop->s_container = value;
	}

	return CODEGEN_RESULT_OK(0);
}

struct code_generator for_loop_generator = {
	.g_type = CODE_GENERATOR_FOR_LOOP,
	.g_state_size = sizeof(struct for_codegen_state),
	.g_state_init = state_init,
	.g_state_fini = state_fini,
	.g_value_received = value_received,
	.g_expr_generator = gen_expr,
	.g_node_generators = {
		NODE_CODEGEN(BLOCK, gen_block),
	},
};