#include "scope.h"

#include <bshell/runtime/runtime.h>
#include <stdlib.h>
#include <string.h>

struct bshell_runtime *bshell_runtime_create(void)
{
	struct bshell_runtime *out = malloc(sizeof *out);
	if (!out) {
		return NULL;
	}

	memset(out, 0x0, sizeof *out);

	out->rt_global = runtime_push_scope(out, RUNTIME_SCOPE_GLOBAL, NULL);
	out->rt_aliases = fx_hashtable_create();

	return out;
}

void bshell_runtime_destroy(struct bshell_runtime *rt)
{
	fx_hashtable_unref(rt->rt_aliases);
	free(rt);
}

bshell_variable *bshell_runtime_find_var(
	struct bshell_runtime *rt,
	const char *name)
{
	bshell_variable *var = NULL;
	fx_queue_entry *cur = fx_queue_last(&rt->rt_scope);
	while (cur) {
		struct bshell_runtime_scope *scope
			= fx_unbox(struct bshell_runtime_scope, cur, s_entry);
		var = var_map_get(&scope->s_vars, name);
		if (var) {
			break;
		}

		cur = fx_queue_prev(cur);
	}

	return var;
}

bshell_variable *bshell_runtime_define_var(
	struct bshell_runtime *rt,
	const char *name)
{
	struct bshell_runtime_scope *scope = runtime_get_scope(rt);
	if (!scope) {
		return NULL;
	}

	bshell_variable *var = bshell_variable_create(name);
	if (!var) {
		return NULL;
	}

	var_map_put(&scope->s_vars, var);
	return var;
}

bshell_command *bshell_runtime_find_command(
	struct bshell_runtime *rt,
	const char *callable_name)
{
	bshell_command *alias = NULL, *func = NULL;
	const fx_value *alias_v
		= fx_hashtable_get(rt->rt_aliases, &FX_CSTR(callable_name));
	if (alias_v) {
		fx_value_get_object(alias_v, &alias);
		bshell_command_ref(alias);
		return alias;
	}

	fx_queue_entry *cur = fx_queue_last(&rt->rt_scope);
	while (cur) {
		struct bshell_runtime_scope *scope
			= fx_unbox(struct bshell_runtime_scope, cur, s_entry);
		const fx_value *func_v = fx_hashtable_get(
			scope->s_functions,
			&FX_CSTR(callable_name));
		if (func_v) {
			fx_value_get_object(func_v, &func);
			bshell_command_ref(func);
			return func;
		}

		cur = fx_queue_prev(cur);
	}

	bshell_command *cmd = bshell_command_find_static(callable_name);
	if (cmd) {
		return cmd;
	}

	/* TODO find native executables */
	return NULL;
}

struct bshell_runtime_scope *bshell_runtime_get_current_scope(
	struct bshell_runtime *rt)
{
	return runtime_get_scope(rt);
}

struct bshell_runtime_scope *bshell_runtime_get_parent_scope(
	struct bshell_runtime *rt,
	struct bshell_runtime_scope *scope)
{
	fx_queue_entry *parent = fx_queue_prev(&scope->s_entry);
	return fx_unbox(struct bshell_runtime_scope, parent, s_entry);
}