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use std

type cmd = union
	`Add (cmd#, cmd#)
	`Sub (cmd#, cmd#)
	`Mul (cmd#, cmd#)
	`Div (cmd#, cmd#)
	`Mod (cmd#, cmd#)
	`Shl (cmd#, cmd#)
	`Shr (cmd#, cmd#)
	`Modpow (cmd#, cmd#, cmd#)
	`Val byte[:]
;;

const main = {
	var a, b, c, d, e
	var buf : byte[64], n

	/* a few combined ops */
	a = std.mkbigint(1234)
	b = std.mkbigint(0x7fffffff)
	c = std.mkbigint(7919)
	d = std.mkbigint(113051)
	e = std.mkbigint(11)

	std.bigmul(a, b)
	std.bigmul(a, b)
	std.bigadd(a, c)
	std.bigsub(a, d)
	std.bigdiv(a, e)

	std.bigfree(b)
	std.bigfree(c)
	std.bigfree(d)
	std.bigfree(e)

	n = std.bigbfmt(buf[:], a, 0)
	std.assert(std.sleq(buf[:n], "517347321949036993306"), "simple smoke test failed")

	/* some comparison tests */
	a = try(std.bigparse("1234_5678_1234_6789_6666_7777_8888"))
	b = try(std.bigparse("2234_5678_1234_6789_6666_7777_8888"))
	match std.bigcmp(a, b)
	| `std.Before:	/* everything is as it should be */
	| `std.Equal:	std.fatal("{} == {}\n", a, b)
	| `std.After:	std.fatal("lies: {} > {}\n", a, b)
	;;
	std.bigfree(a)
	std.bigfree(b)

	a = try(std.bigparse("36028797018963964"))
	b = try(std.bigparse("36028797018963958"))
	match std.bigcmp(a, b)
	| `std.Before:	std.fatal("lies: {} < {}\n", a, b)
	| `std.Equal:	std.fatal("lies: {} == {}\n", a, b)
	| `std.After:	/* everything is as it should be */
	;;
	std.bigfree(a)
	std.bigfree(b)

	/* make sure we format '0' correctly */
	run(std.mk(`Val "0"), "0")
	/* smoke test for division */
	run(std.mk(`Div (\
		std.mk(`Val "1234_5678_1234_6789_6666_7777_8888"), \
		std.mk(`Val "1234_5678_1234_6789_6666_7777"))), \
		"10000")
	run(std.mk(`Div (\
		std.mk(`Val "0xffff_1234_1234_1234_1234"), \
		std.mk(`Val "0xf010_1234_2314"))), \
		"4580035496")
	run(std.mk(`Div (\
		std.mk(`Val "5192296858534810493479828944327220"), \
		std.mk(`Val "75557863709417659441940"))), \
		"68719476751")
	run(std.mk(`Div (\
		std.mk(`Val "75557863709417659441940"), \
		std.mk(`Val "5192296858534810493479828944327220"))), \
		"0")

	/* smoke test for mod */
	run(std.mk(`Mod (\
		std.mk(`Val "5192296858534810493479828944327220"), \
		std.mk(`Val "75557863709417659441940"))),\
		"257025710597479990280")

	run(std.mk(`Modpow (\
		std.mk(`Val "1"), \
		std.mk(`Val "3"), \
		std.mk(`Val "2"))), \
		"1")

	run(std.mk(`Modpow (\
		std.mk(`Val "5192296858534810493479828944327220"), \
		std.mk(`Val "75557863709417659441940"), \
		std.mk(`Val "755578"))), \
		"49054")
	run(std.mk(`Modpow (\
		std.mk(`Val "2393"), \
		std.mk(`Val "2"), \
		std.mk(`Val "6737"))), \
		"6736")
	run(std.mk(`Modpow (\
		std.mk(`Val "6193257528475266832463188301662235"), \
		std.mk(`Val "6157075615645799356061575607567581"), \
		std.mk(`Val "12314151231291598712123151215135163"))), \
		"1540381241336817586803754632242117")
	run(std.mk(`Modpow (\
		std.mk(`Val "7220"), \
		std.mk(`Val "755578"), \
		std.mk(`Val "75557863709417659441940"))), \
		"27076504425474791131220")

}

const run = {e : cmd#, res : byte[:]
	var buf : byte[4096]
	var v, n

	v = eval(e)
	n = std.bigbfmt(buf[:], v, 0)
	if !std.sleq(buf[:n], res)
		std.fatal("{} != {}\n", buf[:n], res)
	;;
}

const eval = {e : cmd#
	var buf : byte[2048]
	var a, b, c	/* scratch vars */
	var n		/* buf len */

	match e#
	| `Add (x, y):	-> binop("+", std.bigadd, x, y)
	| `Sub (x, y):	-> binop("-", std.bigsub, x, y)
	| `Mul (x, y):	-> binop("*", std.bigmul, x, y)
	| `Div (x, y):	-> binop("/", std.bigdiv, x, y)
	| `Mod (x, y):	-> binop("%", std.bigmod, x, y)
	| `Shl (x, y):	-> binop("<<", std.bigshl, x, y)
	| `Shr (x, y):	-> binop(">>", std.bigshr, x, y)
	| `Val x:
		a = try(std.bigparse(x))
		n = std.bigbfmt(buf[:], a, 0)
		-> a
	| `Modpow (x, y, z):
		a = eval(x)
		b = eval(y)
		c = eval(z)
		-> std.bigmodpow(a, b, c)
	;;
}

const binop = {name, op, x, y
	var a, b

	a = eval(x)
	b = eval(y)
	op(a, b)
	std.bigfree(b)
	-> a
}

generic try = {x : std.option(@a)
	match x
	| `std.Some v:	-> v
	| `std.None:	std.die("failed to get val")
	;;
}