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

// Timestamp functions: HB_DATETIME, HB_TTOC, HB_CTOT, HB_HOUR, HB_MIN, HB_SEC,
// HB_TTOS, HB_STOT

package hbrtl

import (
	"five/hbrt"
	"fmt"
	"strconv"
	"strings"
	"time"
)

// HB_DATETIME([nYear, nMonth, nDay, nHour, nMin, nSec, nMSec]) → tTimestamp
func HbDateTime(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()

	now := time.Now()
	if nParams >= 3 {
		y := int(t.Local(1).AsNumInt())
		m := time.Month(t.Local(2).AsNumInt())
		d := int(t.Local(3).AsNumInt())
		h, mi, s, ms := 0, 0, 0, 0
		if nParams >= 4 { h = int(t.Local(4).AsNumInt()) }
		if nParams >= 5 { mi = int(t.Local(5).AsNumInt()) }
		if nParams >= 6 { s = int(t.Local(6).AsNumInt()) }
		if nParams >= 7 { ms = int(t.Local(7).AsNumInt()) }
		now = time.Date(y, m, d, h, mi, s, ms*1000000, time.Local)
	}
	y, mo, d := now.Date()
	julian := dateToJulian(y, int(mo), d)
	timeMs := int32(now.Hour()*3600000 + now.Minute()*60000 + now.Second()*1000 + now.Nanosecond()/1000000)
	t.RetVal(hbrt.MakeTimestamp(julian, timeMs))
}

// HB_HOUR(tTimestamp|cTimeStr) → nHour
func HbHour(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	v := t.Local(1)
	if v.IsTimestamp() {
		t.RetInt(int64(v.AsTimeMs() / 3600000))
		return
	}
	// Fallback: parse string "HH:MM:SS" or "YYYY-MM-DD HH:MM:SS"
	s := v.AsString()
	parts := strings.Split(s, " ")
	timePart := s
	if len(parts) >= 2 { timePart = parts[1] }
	tp := strings.Split(timePart, ":")
	if len(tp) >= 1 { h, _ := strconv.Atoi(tp[0]); t.RetInt(int64(h)); return }
	t.RetInt(0)
}

// HB_MINUTE(tTimestamp|cTimeStr) → nMinute
func HbMinute(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	v := t.Local(1)
	if v.IsTimestamp() {
		t.RetInt(int64(v.AsTimeMs() / 60000 % 60))
		return
	}
	s := v.AsString()
	parts := strings.Split(s, " ")
	timePart := s
	if len(parts) >= 2 { timePart = parts[1] }
	tp := strings.Split(timePart, ":")
	if len(tp) >= 2 { m, _ := strconv.Atoi(tp[1]); t.RetInt(int64(m)); return }
	t.RetInt(0)
}

// HB_SEC(tTimestamp|cTimeStr) → nSecond
func HbSec(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	v := t.Local(1)
	if v.IsTimestamp() {
		t.RetInt(int64(v.AsTimeMs() / 1000 % 60))
		return
	}
	s := v.AsString()
	parts := strings.Split(s, " ")
	timePart := s
	if len(parts) >= 2 { timePart = parts[1] }
	tp := strings.Split(timePart, ":")
	if len(tp) >= 3 { sec, _ := strconv.Atoi(tp[2]); t.RetInt(int64(sec)); return }
	t.RetInt(0)
}

// HB_TTOC(tTimestamp [, cFormat]) → cString
func HbTToC(t *hbrt.Thread) {
	nParams := t.ParamCount()
	t.Frame(nParams, 0)
	defer t.EndProc()
	t.RetString(t.Local(1).AsString())
}

// HB_CTOT(cString) → tTimestamp
func HbCToT(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	t.RetString(t.Local(1).AsString())
}

// HB_TTOS(tTimestamp) → cString (YYYYMMDDHHMMSS)
func HbTToS(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	v := t.Local(1)
	if v.IsTimestamp() {
		y, m, d := julianToDate(v.AsJulian())
		ms := v.AsTimeMs()
		hh := ms / 3600000; mm := ms / 60000 % 60; ss := ms / 1000 % 60
		t.RetString(fmt.Sprintf("%04d%02d%02d%02d%02d%02d", y, m, d, hh, mm, ss))
		return
	}
	// Fallback: string cleanup
	s := v.AsString()
	s = strings.ReplaceAll(s, "-", "")
	s = strings.ReplaceAll(s, ":", "")
	s = strings.ReplaceAll(s, " ", "")
	t.RetString(s)
}

// HB_STOT(cString) → tTimestamp
func HbSToT(t *hbrt.Thread) {
	t.Frame(1, 0)
	defer t.EndProc()
	s := t.Local(1).AsString()
	if len(s) >= 14 {
		formatted := fmt.Sprintf("%s-%s-%s %s:%s:%s",
			s[0:4], s[4:6], s[6:8], s[8:10], s[10:12], s[12:14])
		t.RetString(formatted)
	} else {
		t.RetString(s)
	}
}

// HB_MILLISECONDS() → nMilliseconds (since midnight)
func HbMilliseconds(t *hbrt.Thread) {
	t.Frame(0, 0)
	defer t.EndProc()
	now := time.Now()
	midnight := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, time.Local)
	t.RetLong(now.Sub(midnight).Milliseconds())
}

var _ = fmt.Sprintf // keep import