package leveldb

// #cgo LDFLAGS: -lleveldb
// #include "leveldb/c.h"
import "C"

type CompressionOpt int

const (
	NoCompression     = CompressionOpt(0)
	SnappyCompression = CompressionOpt(1)
)

type Options struct {
	Opt *C.leveldb_options_t
}

type ReadOptions struct {
	Opt *C.leveldb_readoptions_t
}

type WriteOptions struct {
	Opt *C.leveldb_writeoptions_t
}

func NewOptions() *Options {
	opt := C.leveldb_options_create()
	return &Options{opt}
}

func NewReadOptions() *ReadOptions {
	opt := C.leveldb_readoptions_create()
	return &ReadOptions{opt}
}

func NewWriteOptions() *WriteOptions {
	opt := C.leveldb_writeoptions_create()
	return &WriteOptions{opt}
}

func (o *Options) Close() {
	C.leveldb_options_destroy(o.Opt)
}

func (o *Options) SetComparator(cmp *C.leveldb_comparator_t) {
	C.leveldb_options_set_comparator(o.Opt, cmp)
}

func (o *Options) SetErrorIfExists(error_if_exists bool) {
	eie := boolToUchar(error_if_exists)
	C.leveldb_options_set_error_if_exists(o.Opt, eie)
}

func (o *Options) SetCache(cache *Cache) {
	C.leveldb_options_set_cache(o.Opt, cache.Cache)
}

func (o *Options) SetWriteBufferSize(s int) {
	C.leveldb_options_set_write_buffer_size(o.Opt, C.size_t(s))
}

func (o *Options) SetParanoidChecks(pc bool) {
	C.leveldb_options_set_paranoid_checks(o.Opt, boolToUchar(pc))
}

func (o *Options) SetMaxOpenFiles(n int) {
	C.leveldb_options_set_max_open_files(o.Opt, C.int(n))
}

func (o *Options) SetBlockSize(s int) {
	C.leveldb_options_set_block_size(o.Opt, C.size_t(s))
}

func (o *Options) SetBlockRestartInterval(n int) {
	C.leveldb_options_set_block_restart_interval(o.Opt, C.int(n))
}

func (o *Options) SetCompression(t CompressionOpt) {
	C.leveldb_options_set_compression(o.Opt, C.int(t))
}

func (o *Options) SetCreateIfMissing(b bool) {
	C.leveldb_options_set_create_if_missing(o.Opt, boolToUchar(b))
}

func (o *Options) SetFilterPolicy(fp *FilterPolicy) {
	var policy *C.leveldb_filterpolicy_t
	if fp != nil {
		policy = fp.Policy
	}
	C.leveldb_options_set_filter_policy(o.Opt, policy)
}

func (ro *ReadOptions) Close() {
	C.leveldb_readoptions_destroy(ro.Opt)
}

func (ro *ReadOptions) SetVerifyChecksums(b bool) {
	C.leveldb_readoptions_set_verify_checksums(ro.Opt, boolToUchar(b))
}

func (ro *ReadOptions) SetFillCache(b bool) {
	C.leveldb_readoptions_set_fill_cache(ro.Opt, boolToUchar(b))
}

func (ro *ReadOptions) SetSnapshot(snap *Snapshot) {
	var s *C.leveldb_snapshot_t
	if snap != nil {
		s = snap.snap
	}
	C.leveldb_readoptions_set_snapshot(ro.Opt, s)
}

func (wo *WriteOptions) Close() {
	C.leveldb_writeoptions_destroy(wo.Opt)
}

func (wo *WriteOptions) SetSync(b bool) {
	C.leveldb_writeoptions_set_sync(wo.Opt, boolToUchar(b))
}