#include "../debug.h"
#include "codegen.h"

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

struct fstring_codegen_state {
	struct code_generator_state s_base;
	struct mie_value *s_stringbuilder;
};

static struct code_generator_result gen_fstring(
	struct ivy_codegen *gen, struct code_generator_state *state,
	struct ivy_ast_node *node, size_t depth)
{
	struct fstring_codegen_state *fstring
		= (struct fstring_codegen_state *)state;

	struct mie_value *stringbuilder_ptr
		= mie_builder_get_data_ptr(gen->c_builder, "StringBuilder");

	struct mie_type *id = mie_ctx_get_type(gen->c_ctx, MIE_TYPE_ID);
	struct mie_value *stringbuilder_class
		= mie_builder_load(gen->c_builder, id, stringbuilder_ptr, NULL);
	struct mie_value *sel = mie_ctx_get_selector(gen->c_ctx, "_M3newE");

	fstring->s_stringbuilder = mie_builder_msg(
		gen->c_builder, id, stringbuilder_class, sel, NULL, 0, 0, NULL);

	return CODEGEN_RESULT_OK(0);
}

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

static enum ivy_status state_init(
	struct ivy_codegen *gen, struct code_generator_state *state,
	uintptr_t argv, void *argp)
{
	debug_printf("codegen: start of fstring\n");
	return IVY_OK;
}

static enum ivy_status state_fini(
	struct ivy_codegen *gen, struct code_generator_state *state,
	struct code_generator_value *result)
{
	debug_printf("codegen: end of fstring\n");
	struct fstring_codegen_state *fstring
		= (struct fstring_codegen_state *)state;

	struct mie_type *id = mie_ctx_get_type(gen->c_ctx, MIE_TYPE_ID);
	struct mie_value *sel = mie_ctx_get_selector(gen->c_ctx, "_M8toStringE");

	struct mie_value *str = mie_builder_msg(
		gen->c_builder, id, fstring->s_stringbuilder, sel, NULL, 0, 0,
		NULL);

	code_generator_value_set_mie_value(result, str);
	return IVY_OK;
}

static struct code_generator_result value_received(
	struct ivy_codegen *gen, struct code_generator_state *state,
	struct code_generator_value *value)
{
	struct fstring_codegen_state *fstring
		= (struct fstring_codegen_state *)state;

	struct mie_type *void_type = mie_ctx_get_type(gen->c_ctx, MIE_TYPE_VOID);
	struct mie_value *sel = mie_ctx_get_selector(gen->c_ctx, "_M06appendE");

	mie_builder_msg(
		gen->c_builder, void_type, fstring->s_stringbuilder, sel,
		&value->v_value.mie_value, 1, MIE_BUILDER_IGNORE_RESULT, NULL);

	return CODEGEN_RESULT_OK(0);
}

struct code_generator fstring_generator = {
	.g_type = CODE_GENERATOR_FSTRING,
	.g_state_size = sizeof(struct fstring_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(FSTRING, gen_fstring),
	},
};