export const RIBBIT_BANK_COOKIE = 'gbp_ribbit_bank'
const YEAR_SECONDS = 365 * 24 * 60 * 60
const MAX_TOKENS = 10

function writeCookie(value: string, maxAge: number): void {
	const secure = location.protocol === 'https:' ? '; Secure' : ''
	document.cookie = `${RIBBIT_BANK_COOKIE}=${encodeURIComponent(value)}; Max-Age=${maxAge}; Path=/; SameSite=Lax${secure}`
}

export function getRibbitBankCookie(): string {
	const parts = document.cookie.split(';')
	for (const part of parts) {
		const trimmed = part.trim()
		if (trimmed.startsWith(`${RIBBIT_BANK_COOKIE}=`)) {
			return decodeURIComponent(trimmed.substring(RIBBIT_BANK_COOKIE.length + 1))
		}
	}
	return ''
}

export function getRibbitBankCookieTokens(): string[] {
	const raw = getRibbitBankCookie()
	if (!raw) return []
	const seen = new Set<string>()
	const tokens: string[] = []
	for (const part of raw.split(',')) {
		const token = part.trim()
		if (!token || seen.has(token)) continue
		seen.add(token)
		tokens.push(token)
	}
	return tokens
}

export function setRibbitBankCookie(token: string): void {
	addRibbitBankCookie(token)
}

export function addRibbitBankCookie(token: string): void {
	if (!token) return
	const tokens = getRibbitBankCookieTokens().filter((item) => item !== token)
	tokens.unshift(token)
	writeCookie(tokens.slice(0, MAX_TOKENS).join(','), YEAR_SECONDS)
}

export function removeRibbitBankCookie(token: string): void {
	const tokens = getRibbitBankCookieTokens().filter((item) => item !== token)
	if (tokens.length) {
		writeCookie(tokens.join(','), YEAR_SECONDS)
		return
	}
	clearRibbitBankCookie()
}

export function clearRibbitBankCookie(): void {
	writeCookie('', 0)
}