// Copyright (c) 2026 Charles KWON OhJun (charleskwonohjun@gmail.com)
// All rights reserved.

// HBSIX compatibility layer — SIX/Advantage Database Server functions.
// Harbour: /mnt/d/harbour-core/src/rdd/hbsix/
//
// These functions provide compatibility with the SIX driver library.
// In Five, they delegate to the standard DBFCDX engine.

package hbrtl

import (
	"five/hbrt"
	"five/hbrdd"
	"strings"
)

// sx_SetTag(cTag|nOrder) → nOldOrder — set active index tag
func SxSetTag(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()

	wam := getWA(t)
	if wam == nil {
		t.RetInt(0)
		return
	}
	area := wam.Current()
	if area == nil {
		t.RetInt(0)
		return
	}

	if nParams >= 1 && !t.Local(1).IsNil() {
		if idx, ok := area.(hbrdd.Indexer); ok {
			tag := t.Local(1).AsString()
			idx.OrderListFocus(tag)
		}
	}
	t.RetInt(0)
}

// sx_IndexTag(nOrder) → cTagName
func SxIndexTag(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()
	t.RetString("")
}

// sx_TagOrder(cTag) → nOrder
func SxTagOrder(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	t.RetInt(0)
}

// sx_TagCount() → nTags
func SxTagCount(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	t.RetInt(0)
}

// sx_Tags() → aTags (array of tag names)
func SxTags(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	t.RetVal(hbrt.MakeArray(0))
}

// sx_SetFileOrd(nOrder) → nOldOrder
func SxSetFileOrd(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()
	t.RetInt(0)
}

// sx_IsDBT() → lResult — is DBT memo in use?
func SxIsDBT(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	t.RetBool(false)
}

// sx_IsFPT() → lResult — is FPT memo in use?
func SxIsFPT(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	t.RetBool(true) // CDX uses FPT
}

// sx_IsSMT() → lResult — is SMT memo in use?
func SxIsSMT(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	t.RetBool(false)
}

// sx_AutoOpen(lOnOff) → lOldValue — auto-open production index
func SxAutoOpen(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()
	t.RetBool(true) // always auto-open
}

// sx_AutoShare(lOnOff) → lOldValue
func SxAutoShare(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()
	t.RetBool(false)
}

// sx_Blob2File(nFieldPos, cFile) → lSuccess — export memo to file
func SxBlob2File(t *hbrt.Thread) {
	t.Frame(2, 0)
	defer t.EndProc()
	t.RetBool(false) // TODO
}

// sx_File2Blob(cFile, nFieldPos) → lSuccess — import file to memo
func SxFile2Blob(t *hbrt.Thread) {
	t.Frame(2, 0)
	defer t.EndProc()
	t.RetBool(false) // TODO
}

// sx_SetTrigger(nEvent, bBlock) → bOldBlock — database trigger
func SxSetTrigger(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()
	t.RetNil()
}

// sx_VFGet(nFieldPos, nOffset, nLen) → cValue — virtual field get
func SxVFGet(t *hbrt.Thread) {
	t.Frame(3, 0)
	defer t.EndProc()
	t.RetString("")
}

// sx_DbfEncrypt() / sx_DbfDecrypt() — file encryption (stub)
func SxDbfEncrypt(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	t.RetBool(false)
}

func SxDbfDecrypt(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	t.RetBool(false)
}

// sx_Compress() / sx_Decompress() — field compression (stub)
func SxCompress(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	t.RetVal(t.Local(1))
}

func SxDecompress(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	t.RetVal(t.Local(1))
}

// RDDSETDEFAULT / RDDINFO
func RddInfo(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()
	t.RetNil()
}

// RDDNAME() → cCurrentRDD
func RddName(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	wam := getWA(t)
	if wam != nil {
		area := wam.Current()
		if area != nil {
			t.RetString(area.Driver().Name())
			return
		}
	}
	t.RetString("DBFNTX")
}

// RDDLIST() → aDrivers
func RddList(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	names := []string{"DBF", "DBFNTX", "DBFCDX", "DBFFPT", "SIXCDX", "DBFNSX", "DBFSIX", "DBFDBT"}
	items := make([]hbrt.Value, len(names))
	for i, n := range names {
		items[i] = hbrt.MakeString(n)
	}
	t.RetVal(hbrt.MakeArrayFrom(items))
}

var _ = strings.ToUpper // keep import