# Copyright (C) 2022-2023  Luke Shumaker <lukeshu@lukeshu.com>
#
# SPDX-License-Identifier: GPL-2.0-or-later

.DEFAULT_GOAL = all
.SECONDARY:
.DELETE_ON_ERROR:

btrfsitem/items.txt: btrfsitem $(wildcard btrfsitem/item_*.go) $(MAKEFILE_LIST)
	{ \
	  sed -En 's,^type (\S+) .* // (trivial|complex) (.*=.*),\1 \2 \3,p' $(filter btrfsitem/item_%.go,$^) | while read -r typ class keys; do \
	    for key in $$keys; do \
	      echo "$$key" "$$class" "$$typ"; \
	    done; \
	  done; \
	} | LC_COLLATE=C sort >$@
files += btrfsitem/items.txt

btrfsitem/items_gen.go: btrfsitem/items.txt $(MAKEFILE_LIST)
	{ \
	  echo '// Code generated by Make.  DO NOT EDIT.'; \
	  echo; \
	  echo 'package $(@D)'; \
	  echo 'import ('; \
	  echo   '"reflect"'; \
	  echo; \
	  echo   '"git.lukeshu.com/go/typedsync"'; \
	  echo; \
	  echo   '"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsprim"'; \
	  echo ')'; \
	  echo 'const ('; \
	  sed -E 's/(.*)=(.*) (trivial|complex) (.*)/\1_KEY=btrfsprim.\1_KEY/' $<; \
	  echo ')'; \
	  echo 'var ('; \
	  sed -E 's/(.*)=(.*) (trivial|complex) (.*)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/\l&Type = reflect.TypeOf(&{})/'; \
	  echo ')'; \
	  echo '// keytype2gotype is used by UnmarshalItem.'; \
	  echo 'var keytype2gotype = map[Type]reflect.Type{'; \
	  sed -En 's/(.*)=([^:]*) (trivial|complex) (.*)/\1_KEY: \l\4Type,/p' $<; \
	  echo '}'; \
	  echo '// untypedObjID2gotype is used by UnmarshalItem.'; \
	  echo 'var untypedObjID2gotype = map[btrfsprim.ObjID]reflect.Type{'; \
	  sed -En 's/UNTYPED=0:(.*) (trivial|complex) (.*)/btrfsprim.\1: \l\3Type,/p' $<; \
	  echo '}'; \
	  echo '// Pools.'; \
	  echo 'var ('; \
	  sed -E 's/(.*)=(.*) (trivial|complex) (.*)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/\l&Pool = typedsync.Pool[Item]{New: func() Item { return new(&) }}/'; \
	  echo ')'; \
	  echo '// gotype2pool is used by UnmarshalItem.'; \
	  echo 'var gotype2pool = map[reflect.Type]*typedsync.Pool[Item]{'; \
	  sed -E 's/(.*)=(.*) (trivial|complex) (.*)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/\l&Type: \&\l&Pool,/'; \
	  echo '}'; \
	  echo '// isItem implements Item.'; \
	  sed -En 's/(.*)=(.*) (trivial|complex) (.+)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/func (*&) isItem() {}/'; \
	  echo '// Free implements Item.'; \
	  sed -En 's/(.*)=(.*) (trivial) (.+)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/func (o *&) Free() {*o = &{}; \l&Pool.Put(o)}/'; \
	  echo '// Clone is a handy method.'; \
	  sed -En 's/(.*)=(.*) (trivial) (.+)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/func (o &) Clone() & { return o }/'; \
	  echo '// CloneItem implements Item.'; \
	  sed -En 's/(.*)=(.*) (trivial|complex) (.+)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/func (o *&) CloneItem() Item { ret, _ := \l&Pool.Get(); *(ret.(*&)) = o.Clone(); return ret }/'; \
	  echo '// Item type assertions.'; \
	  echo 'var ('; \
	  sed -En 's/(.*)=(.*) (trivial|complex) (.+)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/_ Item = (*&)(nil)/'; \
	  echo ')'; \
	  echo '// Clone type assertions.'; \
	  echo 'var ('; \
	  sed -En 's/(.*)=(.*) (trivial|complex) (.+)/\4/p' $< | LC_COLLATE=C sort -u | sed 's/.*/_ interface{ Clone() & } = &{}/'; \
	  echo ')'; \
	} | sed 's/uUID/uuid/g' | gofmt >$@
files += btrfsitem/items_gen.go

btrfsprim/itemtype.go: btrfsitem/items.txt $(MAKEFILE_LIST)
	{ \
	  echo '// Code generated by Make.  DO NOT EDIT.'; \
	  echo; \
	  echo 'package $(@D)'; \
	  echo 'import ('; \
	  echo '  "fmt"'; \
	  echo '  "math"'; \
	  echo ')'; \
	  echo 'type ItemType uint8'; \
	  echo 'const ('; \
	  sed -E 's,(.*)=([^:]*)(:.*)? (trivial|complex) (.*),\1_KEY ItemType=\2,' $< | uniq; \
	  echo; \
	  echo 'MAX_KEY ItemType = math.MaxUint8'; \
	  echo ')'; \
	  echo 'func (t ItemType) String() string {'; \
	  echo '  switch t {'; \
	  sed -E 's@(.*)=(.*) (trivial|complex) (.*)@case \1_KEY: return "\1"@' $< | sed 's/"UUID_/&KEY_/'; \
	  echo '  default: return fmt.Sprintf("%d", t)'; \
	  echo '  }'; \
	  echo '}'; \
	} | gofmt >$@
files += btrfsprim/itemtype.go

all: $(files)
.PHONY: all

clean:
	rm -f -- $(files)
.PHONY: all