#include <bshell/command/command.h>
#include <bshell/command/function.h>
#include <bshell/runtime/pipeline.h>
#include <bshell/runtime/runtime.h>
#include <bshell/runtime/script-block.h>
#include <bshell/status.h>
#include <fx/collections/array.h>
#include <fx/reflection/function.h>
#include <fx/string.h>
#include <fx/vector.h>

struct bshell_function_p {
	char *func_name;
	fx_array *func_positional_params;
	bshell_scriptblock *func_body;
};

static void init(fx_object *obj, void *priv)
{
	struct bshell_function_p *func_p = priv;
	func_p->func_positional_params = fx_array_create();
	func_p->func_body = bshell_scriptblock_create();
}

static void fini(fx_object *obj, void *priv)
{
	struct bshell_function_p *func_p = priv;
	if (func_p->func_name) {
		free(func_p->func_name);
	}

	fx_array_unref(func_p->func_positional_params);
	bshell_scriptblock_unref(func_p->func_body);
}

static enum bshell_status get_callable_name(
	const bshell_function *func,
	fx_string *out)
{
	struct bshell_function_p *func_p
		= fx_object_get_private(func, BSHELL_TYPE_FUNCTION);
	fx_string_append_cstrf(out, "%s", func_p->func_name);
	return BSHELL_SUCCESS;
}

static enum bshell_status begin_processing(
	bshell_command *cmd,
	enum bshell_command_position position)
{
	return BSHELL_SUCCESS;
}

static enum bshell_status process_record(
	bshell_command *cmd,
	bshell_pipeline *pipeline,
	struct bshell_runtime *rt)
{
	struct bshell_function_p *func_p
		= fx_object_get_private(cmd, BSHELL_TYPE_FUNCTION);
	bshell_runtime_push_scope(rt, func_p->func_body);

	const fx_iterator *param_it
		= fx_iterator_begin(func_p->func_positional_params);
	size_t i = 1;
	fx_foreach(v, param_it)
	{
		fx_string *param = NULL;
		fx_value_get_object(v, &param);

		const fx_value *arg = bshell_command_get_arg(cmd, i);
		if (!arg) {
			break;
		}

		bshell_variable *var = bshell_runtime_define_var(
			rt,
			fx_string_get_cstr(param));
		bshell_variable_set_value(var, *arg);
	}
	fx_iterator_unref(param_it);
#if 0
	bshell_variable *item = bshell_runtime_define_var(rt, "_");
	bshell_variable_set_value(item, &in);
#endif

	fx_value out = bshell_runtime_eval(rt);
	bshell_runtime_pop_scope(rt);
	if (fx_value_is_set(&out)) {
		bshell_pipeline_write_value(pipeline, out, false);
		fx_value_unset(&out);
	}

	return BSHELL_SUCCESS;
}

static enum bshell_status end_processing(bshell_command *cmd)
{
	return BSHELL_SUCCESS;
}

bshell_function *bshell_function_create(const char *name)
{
	bshell_function *out = fx_object_create(BSHELL_TYPE_FUNCTION);
	if (!out) {
		return NULL;
	}

	struct bshell_function_p *func
		= fx_object_get_private(out, BSHELL_TYPE_FUNCTION);
	func->func_name = fx_strdup(name);
	if (!func->func_name) {
		bshell_function_unref(out);
		return NULL;
	}

	return out;
}

void bshell_function_add_positional_parameter(
	bshell_function *func,
	const char *name)
{
	fx_string *str = fx_string_create_from_cstr(name);
	if (!str) {
		return;
	}

	struct bshell_function_p *func_p
		= fx_object_get_private(func, BSHELL_TYPE_FUNCTION);
	fx_array_push_back(
		func_p->func_positional_params,
		FX_VALUE_OBJECT(str));
	fx_string_unref(str);
}

static const char *function_get_name(const struct bshell_function_p *func)
{
	return func->func_name;
}

static const fx_array *function_get_positional_parameters(
	const struct bshell_function_p *func)
{
	return func->func_positional_params;
}

static bshell_scriptblock *function_get_body(struct bshell_function_p *func)
{
	return func->func_body;
}

const char *bshell_function_get_name(const bshell_function *func)
{
	FX_CLASS_DISPATCH_STATIC_0(
		BSHELL_TYPE_FUNCTION,
		function_get_name,
		func);
}

const fx_array *bshell_function_get_positional_parameters(
	const bshell_function *func)
{
	FX_CLASS_DISPATCH_STATIC_0(
		BSHELL_TYPE_FUNCTION,
		function_get_positional_parameters,
		func);
}

bshell_scriptblock *bshell_function_get_body(bshell_function *func)
{
	FX_CLASS_DISPATCH_STATIC_0(
		BSHELL_TYPE_FUNCTION,
		function_get_body,
		func);
}

FX_TYPE_CLASS_BEGIN(bshell_function)
	FX_TYPE_VTABLE_INTERFACE_BEGIN(fx_object, FX_TYPE_OBJECT)
		FX_INTERFACE_ENTRY(to_string) = NULL;
	FX_TYPE_VTABLE_INTERFACE_END(fx_object, FX_TYPE_OBJECT)

	FX_TYPE_VTABLE_INTERFACE_BEGIN(bshell_command, BSHELL_TYPE_COMMAND)
		FX_INTERFACE_ENTRY(c_command_type) = "Function";
		FX_INTERFACE_ENTRY(c_get_callable_name) = get_callable_name;
		FX_INTERFACE_ENTRY(c_begin_processing) = begin_processing;
		FX_INTERFACE_ENTRY(c_process_record) = process_record;
		FX_INTERFACE_ENTRY(c_end_processing) = end_processing;
	FX_TYPE_VTABLE_INTERFACE_END(bshell_command, BSHELL_TYPE_COMMAND)
FX_TYPE_CLASS_END(bshell_function)

FX_TYPE_DEFINITION_BEGIN(bshell_function)
	FX_TYPE_ID(0x041f1918, 0x6155, 0x4cee, 0xbb01, 0xfef2d6aa1bcf);
	FX_TYPE_NAME("bshell.runtime.function");
	FX_TYPE_EXTENDS(BSHELL_TYPE_COMMAND);
	FX_TYPE_CLASS(bshell_function_class);
	FX_TYPE_INSTANCE_INIT(init);
	FX_TYPE_INSTANCE_FINI(fini);
	FX_TYPE_INSTANCE_PRIVATE(struct bshell_function_p);
FX_TYPE_DEFINITION_END(bshell_function)