#include "node.h"

#include <ivy/lang/ast.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

extern struct ast_node_type unit_node_ops;
extern struct ast_node_type unit_package_node_ops;
extern struct ast_node_type unit_import_node_ops;
extern struct ast_node_type class_node_ops;
extern struct ast_node_type msgh_node_ops;
extern struct ast_node_type selector_node_ops;
extern struct ast_node_type expr_node_ops;
extern struct ast_node_type block_node_ops;
extern struct ast_node_type msg_node_ops;
extern struct ast_node_type op_node_ops;
extern struct ast_node_type ident_node_ops;
extern struct ast_node_type int_node_ops;
extern struct ast_node_type double_node_ops;
extern struct ast_node_type string_node_ops;

static const struct ast_node_type *node_ops[] = {
	[IVY_AST_UNIT] = &unit_node_ops,
	[IVY_AST_UNIT_PACKAGE] = &unit_package_node_ops,
	[IVY_AST_UNIT_IMPORT] = &unit_import_node_ops,
	[IVY_AST_CLASS] = &class_node_ops,
	[IVY_AST_MSGH] = &msgh_node_ops,
	[IVY_AST_SELECTOR] = &selector_node_ops,
	[IVY_AST_EXPR] = &expr_node_ops,
	[IVY_AST_BLOCK] = &block_node_ops,
	[IVY_AST_MSG] = &msg_node_ops,
	[IVY_AST_OP] = &op_node_ops,
	[IVY_AST_IDENT] = &ident_node_ops,
	[IVY_AST_INT] = &int_node_ops,
	[IVY_AST_DOUBLE] = &double_node_ops,
	[IVY_AST_STRING] = &string_node_ops,
};
static const size_t nr_node_ops = sizeof node_ops / sizeof node_ops[0];

const struct ast_node_type *get_ast_node_type(enum ivy_ast_node_type type)
{
	if (type >= nr_node_ops) {
		return NULL;
	}

	return node_ops[type];
}

enum token_expr_type get_token_expr_type(struct ivy_token *tok)
{
	const struct ivy_operator *op = NULL;

	switch (tok->t_type) {
	case IVY_TOK_IDENT:
	case IVY_TOK_INT:
	case IVY_TOK_DOUBLE:
	case IVY_TOK_STRING:
	case IVY_TOK_STR_START:
	case IVY_TOK_ATOM:
		return TOK_EXPR_BEGIN;
	case IVY_TOK_SYMBOL:
		switch (tok->t_symbol) {
		case IVY_SYM_LEFT_PAREN:
		case IVY_SYM_CARET:
			return TOK_EXPR_BEGIN;
		case IVY_SYM_COMMA:
			return TOK_EXPR_ANY;
		default:
			op = ivy_operator_get_by_token(tok->t_symbol);
			return op ? TOK_EXPR_ANY : TOK_EXPR_NONE;
		}
	case IVY_TOK_KEYWORD:
		switch (tok->t_keyword) {
		case IVY_KW_IF:
		case IVY_KW_ELSE:
		case IVY_KW_MATCH:
		case IVY_KW_FOR:
		case IVY_KW_WHILE:
		case IVY_KW_TRY:
		case IVY_KW_CATCH:
		case IVY_KW_THROW:
			return TOK_EXPR_BEGIN;
		default:
			op = ivy_operator_get_by_token(tok->t_keyword);
			return op ? TOK_EXPR_ANY : TOK_EXPR_NONE;
			return TOK_EXPR_NONE;
		}
	default:
		return TOK_EXPR_NONE;
	}
}

token_parse_function get_token_parser(
	struct ivy_ast_node *context, struct ivy_token *tok)
{
	const struct ast_node_type *type = get_ast_node_type(context->n_type);
	if (!type) {
		return NULL;
	}
	token_parse_function generic_parser
		= type->n_token_parsers[__TOK_PARSER_INDEX(tok->t_type)];

	if (!generic_parser) {
		generic_parser
			= type->n_token_parsers[__TOK_PARSER_FALLBACK_INDEX];
	}

	token_parse_function better_parser = NULL;

	switch (tok->t_type) {
	case IVY_TOK_KEYWORD:
		better_parser
			= type->n_keyword_parsers[__KW_PARSER_INDEX(tok->t_keyword)];
		if (type->n_keyword_parsers[__KW_PARSER_FALLBACK_INDEX]) {
			generic_parser
				= type->n_keyword_parsers[__KW_PARSER_FALLBACK_INDEX];
		}
		break;
	case IVY_TOK_SYMBOL:
		better_parser
			= type->n_symbol_parsers[__SYM_PARSER_INDEX(tok->t_symbol)];
		if (type->n_symbol_parsers[__SYM_PARSER_FALLBACK_INDEX]) {
			generic_parser
				= type->n_symbol_parsers[__SYM_PARSER_FALLBACK_INDEX];
		}
		break;
	default:
		break;
	}

	if (better_parser) {
		return better_parser;
	}

	enum token_expr_type expr_type = get_token_expr_type(tok);
	switch (expr_type) {
	case TOK_EXPR_BEGIN:
		better_parser = type->n_expr_parser.expr_begin
		                      ? type->n_expr_parser.expr_begin
		                      : type->n_expr_parser.expr_all;
		break;
	case TOK_EXPR_ANY:
		better_parser = type->n_expr_parser.expr_other
		                      ? type->n_expr_parser.expr_other
		                      : type->n_expr_parser.expr_all;
		break;
	default:
		break;
	}

	return better_parser ? better_parser : generic_parser;
}

struct ivy_ast_node *ast_node_create(enum ivy_ast_node_type type)
{
	const struct ast_node_type *type_info = get_ast_node_type(type);
	if (!type_info) {
		return NULL;
	}

	struct ivy_ast_node *node = malloc(type_info->n_node_size);
	if (!node) {
		return NULL;
	}

	memset(node, 0x0, type_info->n_node_size);

	node->n_type = type;
	return node;
}

static enum ivy_status node_print(
	struct ivy_ast_node *node, struct ivy_ast_node_iterator *it)
{
	for (unsigned int i = 0; i < node->n_it.it_depth; i++) {
		fputs("  ", stdout);
	}

	const struct ast_node_type *type = get_ast_node_type(node->n_type);
	if (type && type->n_print) {
		type->n_print(node);
	} else {
		printf("%s\n", ivy_ast_node_type_to_string(node->n_type));
	}

	return IVY_OK;
}

void ivy_ast_node_print(struct ivy_ast_node *node)
{
	struct ivy_ast_node_iterator it = {0};
	ivy_ast_node_iterate(node, &it, node_print);
}

void ivy_ast_node_destroy(struct ivy_ast_node *node)
{
}

#define ENUM_STR(x)                                                            \
	case x:                                                                \
		return #x

const char *ivy_ast_node_type_to_string(enum ivy_ast_node_type v)
{
	switch (v) {
		ENUM_STR(IVY_AST_NONE);
		ENUM_STR(IVY_AST_UNIT);
		ENUM_STR(IVY_AST_OP);
		ENUM_STR(IVY_AST_MSG);
		ENUM_STR(IVY_AST_CLASS);
		ENUM_STR(IVY_AST_MSGH);
		ENUM_STR(IVY_AST_PROPERTY);
		ENUM_STR(IVY_AST_SELECTOR);
		ENUM_STR(IVY_AST_EXPR);
		ENUM_STR(IVY_AST_LAMBDA);
		ENUM_STR(IVY_AST_UNIT_PACKAGE);
		ENUM_STR(IVY_AST_UNIT_IMPORT);
		ENUM_STR(IVY_AST_INT);
		ENUM_STR(IVY_AST_DOUBLE);
		ENUM_STR(IVY_AST_STRING);
		ENUM_STR(IVY_AST_FSTRING);
		ENUM_STR(IVY_AST_ATOM);
		ENUM_STR(IVY_AST_IDENT);
		ENUM_STR(IVY_AST_FOR_LOOP);
		ENUM_STR(IVY_AST_WHILE_LOOP);
		ENUM_STR(IVY_AST_COND_GROUP);
		ENUM_STR(IVY_AST_COND);
		ENUM_STR(IVY_AST_TUPLE);
		ENUM_STR(IVY_AST_BLOCK);
		ENUM_STR(IVY_AST_TYPE_COUNT);
	default:
		return "";
	}
}