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// Copyright (C) 2019 Yasuhiro Matsumoto <mattn.jp@gmail.com>.
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//
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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package sqlite3
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/*
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#ifndef USE_LIBSQLITE3
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#include "sqlite3-binding.h"
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#else
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#include <sqlite3.h>
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#endif
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#include <stdlib.h>
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*/
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import "C"
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import (
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	"runtime"
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	"unsafe"
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)
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// SQLiteBackup implement interface of Backup.
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type SQLiteBackup struct {
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	b *C.sqlite3_backup
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}
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// Backup make backup from src to dest.
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func (destConn *SQLiteConn) Backup(dest string, srcConn *SQLiteConn, src string) (*SQLiteBackup, error) {
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	destptr := C.CString(dest)
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	defer C.free(unsafe.Pointer(destptr))
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	srcptr := C.CString(src)
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	defer C.free(unsafe.Pointer(srcptr))
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	if b := C.sqlite3_backup_init(destConn.db, destptr, srcConn.db, srcptr); b != nil {
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		bb := &SQLiteBackup{b: b}
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		runtime.SetFinalizer(bb, (*SQLiteBackup).Finish)
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		return bb, nil
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	}
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	return nil, destConn.lastError()
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}
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// Step to backs up for one step. Calls the underlying `sqlite3_backup_step`
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// function.  This function returns a boolean indicating if the backup is done
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// and an error signalling any other error. Done is returned if the underlying
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// C function returns SQLITE_DONE (Code 101)
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func (b *SQLiteBackup) Step(p int) (bool, error) {
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	ret := C.sqlite3_backup_step(b.b, C.int(p))
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	if ret == C.SQLITE_DONE {
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		return true, nil
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	} else if ret != 0 && ret != C.SQLITE_LOCKED && ret != C.SQLITE_BUSY {
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		return false, Error{Code: ErrNo(ret)}
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	}
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	return false, nil
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}
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// Remaining return whether have the rest for backup.
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func (b *SQLiteBackup) Remaining() int {
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	return int(C.sqlite3_backup_remaining(b.b))
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}
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// PageCount return count of pages.
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func (b *SQLiteBackup) PageCount() int {
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	return int(C.sqlite3_backup_pagecount(b.b))
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}
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// Finish close backup.
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func (b *SQLiteBackup) Finish() error {
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	return b.Close()
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}
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// Close close backup.
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func (b *SQLiteBackup) Close() error {
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	ret := C.sqlite3_backup_finish(b.b)
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	// sqlite3_backup_finish() never fails, it just returns the
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	// error code from previous operations, so clean up before
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	// checking and returning an error
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	b.b = nil
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	runtime.SetFinalizer(b, nil)
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	if ret != 0 {
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		return Error{Code: ErrNo(ret)}
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	}
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	return nil
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}
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