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

// SET command functions: SET EXACT, SET SOFTSEEK, SET DELETED, SET EXCLUSIVE,
// SET(_SET_xxx, lValue) pattern.
// Harbour: src/rtl/set.c — 47+ settings in HB_SET_ENUM.

package hbrtl

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

// SET indices (Harbour HB_SET_ENUM compatible)
const (
	SetExact     = 1
	SetFixed     = 2
	SetDecimals  = 3
	SetDateFmt   = 4
	SetEpoch     = 5
	SetPath      = 6
	SetDefault   = 7
	SetDeleted   = 8
	SetExclusive = 11
	SetSoftSeek  = 12
	SetUnique    = 13
	SetCancel    = 14
	SetConfirm   = 15
	SetConsole   = 16
	SetAlternate = 17
	SetDevice    = 18
	SetPrinter   = 19
	SetBell      = 20
	SetEscape    = 21
	SetInsert    = 22
	SetExit      = 23
	SetIntensity = 24
	SetScoreB    = 25
	SetColorIdx  = 26
	SetCursorIdx = 27
	SetWrap      = 28
	SetMessage   = 29
)

var (
	settings = map[int]hbrt.Value{
		SetExact:     hbrt.MakeBool(false),
		SetFixed:     hbrt.MakeBool(false),
		SetDecimals:  hbrt.MakeInt(2),
		SetDeleted:   hbrt.MakeBool(false),
		SetExclusive: hbrt.MakeBool(true),
		SetSoftSeek:  hbrt.MakeBool(false),
		SetUnique:    hbrt.MakeBool(false),
		SetCancel:    hbrt.MakeBool(true),
		SetConfirm:   hbrt.MakeBool(false),
		SetConsole:   hbrt.MakeBool(true),
		SetBell:      hbrt.MakeBool(false),
		SetEscape:    hbrt.MakeBool(true),
		SetInsert:    hbrt.MakeBool(false),
		SetExit:      hbrt.MakeBool(false),
		SetIntensity: hbrt.MakeBool(true),
		SetWrap:      hbrt.MakeBool(false),
	}
	setMu sync.Mutex
)

// SET(nSpecifier [, xNewValue]) → xOldValue
// Generic SET function matching Harbour's Set() function.
func SetFunc(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()

	nSet := t.Local(1).AsInt()

	setMu.Lock()
	defer setMu.Unlock()

	old, exists := settings[nSet]
	if !exists {
		old = hbrt.MakeNil()
	}

	if nParams >= 2 && !t.Local(2).IsNil() {
		settings[nSet] = t.Local(2)
	}

	t.RetVal(old)
}

// GetSetting returns a SET value (called internally).
func GetSetting(nSet int) hbrt.Value {
	setMu.Lock()
	defer setMu.Unlock()
	v, ok := settings[nSet]
	if !ok {
		return hbrt.MakeNil()
	}
	return v
}

// GetSetDeleted returns SET DELETED state.
func GetSetDeleted() bool {
	return GetSetting(SetDeleted).AsBool()
}

// GetSetExact returns SET EXACT state.
func GetSetExact() bool {
	return GetSetting(SetExact).AsBool()
}

// GetSetSoftSeek returns SET SOFTSEEK state.
func GetSetSoftSeek() bool {
	return GetSetting(SetSoftSeek).AsBool()
}

// GetSetDateFormat returns SET DATE format string.
func GetSetDateFormat() string {
	v := GetSetting(SetDateFmt)
	if v.IsString() {
		return v.AsString()
	}
	return "mm/dd/yy"
}

// GetSetDecimals returns SET DECIMALS value.
func GetSetDecimals() int {
	return GetSetting(SetDecimals).AsInt()
}

// GetSetEpoch returns SET EPOCH year.
func GetSetEpoch() int {
	v := GetSetting(SetEpoch)
	if v.IsNumeric() {
		return v.AsInt()
	}
	return 1900
}

// --- Dedicated SET toggle functions ---
// Harbour: SET EXACT ON/OFF, SET DELETED ON/OFF, etc.

// SetExactFunc: SET(_SET_EXACT [, lNew]) → lOld
func SetExactFunc(t *hbrt.Thread) { setToggle(t, SetExact) }

// SetDeletedFunc: SET(_SET_DELETED [, lNew]) → lOld
func SetDeletedFunc(t *hbrt.Thread) { setToggle(t, SetDeleted) }

// SetSoftSeekFunc: SET(_SET_SOFTSEEK [, lNew]) → lOld
func SetSoftSeekFunc(t *hbrt.Thread) { setToggle(t, SetSoftSeek) }

// SetExclusiveFunc: SET(_SET_EXCLUSIVE [, lNew]) → lOld
func SetExclusiveFunc(t *hbrt.Thread) { setToggle(t, SetExclusive) }

// SetFixedFunc: SET(_SET_FIXED [, lNew]) → lOld
func SetFixedFunc(t *hbrt.Thread) { setToggle(t, SetFixed) }

// SetCancelFunc: SET(_SET_CANCEL [, lNew]) → lOld
func SetCancelFunc(t *hbrt.Thread) { setToggle(t, SetCancel) }

// SetBellFunc: SET(_SET_BELL [, lNew]) → lOld
func SetBellFunc(t *hbrt.Thread) { setToggle(t, SetBell) }

// SetConfirmFunc: SET(_SET_CONFIRM [, lNew]) → lOld
func SetConfirmFunc(t *hbrt.Thread) { setToggle(t, SetConfirm) }

// SetInsertFunc: SET(_SET_INSERT [, lNew]) → lOld
func SetInsertFunc(t *hbrt.Thread) { setToggle(t, SetInsert) }

// SetEscapeFunc: SET(_SET_ESCAPE [, lNew]) → lOld
func SetEscapeFunc(t *hbrt.Thread) { setToggle(t, SetEscape) }

// SetWrapFunc: SET(_SET_WRAP [, lNew]) → lOld
func SetWrapFunc(t *hbrt.Thread) { setToggle(t, SetWrap) }

// setToggle implements SET(n, lNew) → lOld for boolean settings
func setToggle(t *hbrt.Thread, setID int) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()

	setMu.Lock()
	defer setMu.Unlock()

	old, ok := settings[setID]
	if !ok {
		old = hbrt.MakeBool(false)
	}

	if nParams >= 1 && !t.Local(1).IsNil() {
		settings[setID] = t.Local(1)
	}
	t.RetVal(old)
}

// SetDateFunc: __SetDateFormat([cNew]) → cOld
func SetDateFunc(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()

	setMu.Lock()
	defer setMu.Unlock()

	old, ok := settings[SetDateFmt]
	if !ok {
		old = hbrt.MakeString("mm/dd/yy")
	}

	if nParams >= 1 && t.Local(1).IsString() {
		dfmt := t.Local(1).AsString()
		settings[SetDateFmt] = hbrt.MakeString(dfmt)
	}
	t.RetVal(old)
}

// SetDecimalsFunc: SET DECIMALS TO n
func SetDecimalsFunc(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()

	setMu.Lock()
	defer setMu.Unlock()

	old := settings[SetDecimals]
	if nParams >= 1 && t.Local(1).IsNumeric() {
		settings[SetDecimals] = t.Local(1)
	}
	t.RetVal(old)
}

// SetEpochFunc: SET EPOCH TO n
func SetEpochFunc(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()

	setMu.Lock()
	defer setMu.Unlock()

	old, ok := settings[SetEpoch]
	if !ok {
		old = hbrt.MakeInt(1900)
	}
	if nParams >= 1 && t.Local(1).IsNumeric() {
		settings[SetEpoch] = t.Local(1)
	}
	t.RetVal(old)
}

// --- SET constants for PRG code (registered as RTL functions) ---

// _SET_EXACT etc. — return the SET index constant
func SetConstExact(t *hbrt.Thread)     { t.Frame(0, 0); defer t.EndProc(); t.PushInt(SetExact); t.RetValue() }
func SetConstDeleted(t *hbrt.Thread)   { t.Frame(0, 0); defer t.EndProc(); t.PushInt(SetDeleted); t.RetValue() }
func SetConstSoftSeek(t *hbrt.Thread)  { t.Frame(0, 0); defer t.EndProc(); t.PushInt(SetSoftSeek); t.RetValue() }
func SetConstExclusive(t *hbrt.Thread) { t.Frame(0, 0); defer t.EndProc(); t.PushInt(SetExclusive); t.RetValue() }
func SetConstDateFmt(t *hbrt.Thread)   { t.Frame(0, 0); defer t.EndProc(); t.PushInt(SetDateFmt); t.RetValue() }
func SetConstDecimals(t *hbrt.Thread)  { t.Frame(0, 0); defer t.EndProc(); t.PushInt(SetDecimals); t.RetValue() }
func SetConstEpoch(t *hbrt.Thread)     { t.Frame(0, 0); defer t.EndProc(); t.PushInt(SetEpoch); t.RetValue() }

// init registers default DATE format and EPOCH, and hooks into hbrdd.
func init() {
	hbrdd.IsSetDeleted = GetSetDeleted

	setMu.Lock()
	if _, ok := settings[SetDateFmt]; !ok {
		settings[SetDateFmt] = hbrt.MakeString("mm/dd/yy")
	}
	if _, ok := settings[SetEpoch]; !ok {
		settings[SetEpoch] = hbrt.MakeInt(1900)
	}
	setMu.Unlock()
}