import { formatNumber, t } from '@/i18n'
import type { ActivitySummary, RangeKey } from '@/lib/activity'

export type StripKey = 'total' | 'active' | 'failed' | 'security'
export type StripTone = 'neutral' | 'error' | 'warning' | 'calm'

export interface StripCard {
	key: StripKey
	label: string
	value: string
	subline: string
	icon: string | null
	tone: StripTone
	series: number[]
}

export const STRIP_KEYS: StripKey[] = ['total', 'active', 'failed', 'security']
export const MIN_BAR_HEIGHT = 2

function percent(part: number, whole: number) {
	return Math.round((Math.abs(part - whole) / whole) * 100)
}

function totalSubline(summary: ActivitySummary, range: RangeKey) {
	if (summary.total === 0) return { text: t('No data yet'), icon: null }
	if (summary.previous_total === 0) return { text: t('No earlier data'), icon: null }
	if (summary.total === summary.previous_total) return { text: t('No change'), icon: null }
	const value = formatNumber(percent(summary.total, summary.previous_total))
	const text =
		range === 'today'
			? t('{0}% vs previous day', [value])
			: range === '30d'
				? t('{0}% vs previous 30 days', [value])
				: range === 'custom'
					? t('{0}% vs previous period', [value])
					: t('{0}% vs previous 7 days', [value])
	const icon =
		summary.total >= summary.previous_total ? 'i-lucide-trending-up' : 'i-lucide-trending-down'
	return { text, icon }
}

function peopleSubline(summary: ActivitySummary) {
	if (summary.total === 0) return t('No data yet')
	const { users, api_keys: keys } = summary.active_people
	const people = users === 1 ? t('1 person') : t('{0} people', [formatNumber(users)])
	const apiKeys = keys === 1 ? t('1 API key') : t('{0} API keys', [formatNumber(keys)])
	return `${people}, ${apiKeys}`
}

function failedSubline(summary: ActivitySummary) {
	const ratio = (summary.failed / summary.total) * 100
	return t('{0}% of all actions', [
		formatNumber(ratio, {
			minimumFractionDigits: 1,
			maximumFractionDigits: 1,
		}),
	])
}

function flaggedSubline(count: number) {
	return count === 1 ? t('1 flagged') : t('{0} flagged', [formatNumber(count)])
}

export function stripCards(summary: ActivitySummary, range: RangeKey): StripCard[] {
	const total = totalSubline(summary, range)
	const failedCalm = summary.failed === 0
	const securityCalm = summary.security === 0
	return [
		{
			key: 'total',
			label: t('Total actions'),
			value: formatNumber(summary.total),
			subline: total.text,
			icon: total.icon,
			tone: 'neutral',
			series: summary.series.total,
		},
		{
			key: 'active',
			label: t('Active people'),
			value: formatNumber(summary.active_people.users + summary.active_people.api_keys),
			subline: peopleSubline(summary),
			icon: null,
			tone: 'neutral',
			series: summary.series.active,
		},
		{
			key: 'failed',
			label: t('Failed actions'),
			value: formatNumber(summary.failed),
			subline: failedCalm ? t('Nothing failed') : failedSubline(summary),
			icon: failedCalm ? 'i-lucide-circle-check' : 'i-lucide-circle-x',
			tone: failedCalm ? 'calm' : 'error',
			series: summary.series.failed,
		},
		{
			key: 'security',
			label: t('Security events'),
			value: formatNumber(summary.security),
			subline: securityCalm ? t('Nothing to flag') : flaggedSubline(summary.security),
			icon: securityCalm ? 'i-lucide-circle-check' : 'i-lucide-shield-alert',
			tone: securityCalm ? 'calm' : 'warning',
			series: summary.series.security,
		},
	]
}

export function barHeights(series: number[], height: number) {
	const peak = Math.max(...series, 1)
	return series.map((value) => Math.max(MIN_BAR_HEIGHT, Math.round((value / peak) * height)))
}