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use std

use "opts"
use "types"

pkg bld =
	type syssel(@a) = struct
		file	: byte[:]
		line	: int
		targ	: byte[:]
		sysattrs	: std.htab(byte[:], (int, int, int))#
		_match	: std.htab(byte[:], (int, int))#
		_best	: std.htab(byte[:], @a)#
	;;

	generic mksyssel	: (b : build#, f : byte[:], line : int, targ : byte[:] -> syssel(@a)#)
	generic sysseladd	: (syssel : syssel(byte[:])#, file : byte[:] -> void)
	generic sysseladdlist	: (syssel : syssel(@a)#, base : byte[:], attrs : byte[:][:], val : @a -> void)
	generic sysselfin	: (syssel : syssel(@a)# -> @a[:])
	const addsysattrs	: (sa : build#, tags : byte[:][:] -> void)
;;

generic mksyssel = {b, file, line, targ
	var syssel

	syssel = std.mk([
		.file = file,
		.line = line,
		.targ = targ,
		._match = std.mkht(std.strhash, std.streq),
		._best = std.mkht(std.strhash, std.streq),
		.sysattrs = b.tags
	])
	-> syssel
}

generic sysseladd = {syssel, f
	var basename, attrs
	var attrlist

	match std.strfind(f, "+")
	| `std.Some i:
		basename = f[:i]
		match std.strrfind(f[i+1:], ".")
		| `std.Some j:	attrs = f[i+1:][:j]
		| `std.None:	std.fatal("unrecognized type for file {}\n", f)
		;;
	| `std.None:
		match std.strrfind(f, ".")
		| `std.None:	std.fatal("unrecognized type for file {}\n", f)
		| `std.Some i:
			basename = f[:i]
			attrs = ""
		;;
	;;

	attrlist = std.strsplit(attrs, "-")
	sysseladdlist(syssel, basename, attrlist, f)
	std.slfree(attrlist)
}

generic sysseladdlist = {syssel, base, attrs, val
	var nmatch, vscore, n, v, s

	nmatch = 0
	vscore = 0
	for a : attrs
		match std.strfind(a, ":")
		| `std.Some i:
			n = a[:i]
			v = parseversion(a[i+1:])
		| `std.None:
			n = a
			v = (-1, -1, -1)
		;;

		match std.htget(syssel.sysattrs, n)
		| `std.None:
			nmatch = -1
			break
		| `std.Some have:
			s = versionscore(syssel, have, v)
			if s < 0
				nmatch = -1
				break
			;;
			vscore += s
			nmatch++
		;;
	;;
	match std.htgetv(syssel._match, base, (-1, -1))
	| (curbest, curscore):
		if curbest < nmatch || (nmatch >= 0 && curbest == nmatch && curscore < vscore)
			std.htput(syssel._match, base, (nmatch, vscore))
			std.htput(syssel._best, base, val)
		;;
	;;
}

const versionscore = {syssel, have, want
	var s

	s = 0
	match (have, want)
	| ((a0, a1, a2), (v0, v1, v2)):
		if a0 == -1 && a1 == -1 && a2 == -1
			-> s
		elif v0 == -1 && v1 == -1 && v2 == -1
			-> s
		else
			s = 1_000_000 * (a0 - v0)
			if s == 0
				s += 1_000 * (a1 - v1)
			;;
			if s == 0
				s += (a2 - v2)
			;;
			if s >= 0
				s = 100_000_000 - s
			;;
			-> s
		;;
	;;
}

generic sysselfin = {syssel
	var keys, nmatch, ret

	keys = std.htkeys(syssel._match)
	ret = [][:]
	for k : keys
		(nmatch, _) = std.htgetv(syssel._match, k, (-1, -1))
		if nmatch == -1
			std.fatal("{}:{}: target {}, no applicable file for '{}'\n", \
				syssel.file, syssel.line, syssel.targ, k)
		;;
		std.slpush(&ret, std.get(std.htget(syssel._best, k)))
	;;
	std.htfree(syssel._match)
	std.htfree(syssel._best)
	-> ret
}

const addsysattrs = {b, tags
	std.htput(b.tags, opt_sys, opt_sysvers)

	match opt_sys
	| "freebsd":	tag(b, "posixy")
	| "netbsd":	tag(b, "posixy")
	| "openbsd":	tag(b, "posixy")
	| "osx":	tag(b, "posixy")
	| "linux":	tag(b, "posixy")
	| "plan9":
	| unknown:	std.fatal("unknown system \"{}\"\n", unknown)
	;;

	match opt_arch
	| "x64":	tag(b, "x64")
	| unknown:	std.fatal("unknown architecture {}\n", unknown)
	;;
	for t : tags
		tag(b, t)
	;;

	loadtagfile(b, "bld.tag")
}

const loadtagfile = {b, tagfile
	var data, sp

	if !std.fexists(tagfile)
		-> void
	;;
	data = std.try(std.slurp(tagfile))
	while true
		sp = std.strtok(data)
		for t : sp
			tag(b, t)
		;;
		std.slfree(sp)
	;;
	std.slfree(data)
}

const tag  = {b, tag
	std.htput(b.tags, std.sldup(tag), (-1, -1, -1))
}