package ui

import (
	"image/color"
	"time"

	"gioui.org/layout"
	"gioui.org/unit"

	"git.wxccs.org/iceking2nd/winauth-go/internal/authenticator"
)

// entryProgressRing draws the per-row TOTP countdown ring. For HOTP
// entries it returns a same-sized blank box so the rows still line up.
func entryProgressRing(gtx layout.Context, en *entry) layout.Dimensions {
	const ringDp = 22
	if en.Auth == nil || en.Auth.Name() == "hotp" {
		return layout.Dimensions{Size: gtx.Constraints.Constrain(
			layout.Spacer{Width: unit.Dp(ringDp), Height: unit.Dp(ringDp)}.Layout(gtx).Size,
		)}
	}
	period := totpPeriod(en.Auth)
	if period <= 0 {
		period = authenticator.DefaultPeriod
	}
	now := time.Now().Unix()
	elapsed := now % int64(period)
	remaining := int64(period) - elapsed
	progress := float32(remaining) / float32(period)

	fg := color.NRGBA{R: 0x10, G: 0x70, B: 0xff, A: 0xff}
	if remaining <= 5 {
		fg = color.NRGBA{R: 0xd0, G: 0x30, B: 0x30, A: 0xff}
	}
	bg := color.NRGBA{R: 0xd8, G: 0xd8, B: 0xd8, A: 0xff}

	return progressRing{
		Size:     unit.Dp(ringDp),
		Stroke:   unit.Dp(2.5),
		Progress: progress,
		Color:    fg,
		BgColor:  bg,
	}.Layout(gtx)
}

// totpPeriod extracts the configured period from any authenticator whose
// underlying Base we can reach. Returns 0 if the authenticator does not
// expose one (in which case callers fall back to the default).
func totpPeriod(a authenticator.Authenticator) int {
	type periodGetter interface{ GetPeriod() int }
	if pg, ok := a.(periodGetter); ok {
		return pg.GetPeriod()
	}
	// All current TOTP-like authenticators (Google/Microsoft/Okta/Steam/
	// BattleNet) embed authenticator.Base whose default period is 30s,
	// matching the C# original. Hard-code that here.
	return authenticator.DefaultPeriod
}