export const DROPSHIP_SCAN_INTENT = Object.freeze({
	BLOCKED: 'BLOCKED',
	INVALID: 'INVALID',
	DUPLICATE: 'DUPLICATE',
	RESOLVE_CARTON: 'RESOLVE_CARTON',
	SELECT_PALLET: 'SELECT_PALLET',
	BIND_PENDING: 'BIND_PENDING'
})

export const PALLET_NO_PATTERN = /^DP-[0-9]{6}-[0-9]{4}$/

function normalize(value) {
	return value == null ? '' : String(value).trim().toUpperCase()
}

export function createDropshipScanState(value = {}) {
	return {
		online: value.online !== false,
		activePalletNo: normalize(value.activePalletNo),
		pendingBoxCode: normalize(value.pendingBoxCode),
		lastScanCode: normalize(value.lastScanCode)
	}
}

export function planDropshipScan(currentState, rawCode, { unboundCartons = 0 } = {}) {
	const state = createDropshipScanState(currentState)
	const scanCode = normalize(rawCode)
	if (!state.online) return { state, intent: DROPSHIP_SCAN_INTENT.BLOCKED, message: '当前网络不可用，不能执行正式扫码' }
	if (!scanCode) return { state, intent: DROPSHIP_SCAN_INTENT.INVALID, message: '扫码内容不能为空' }
	if (scanCode === state.lastScanCode) return { state, intent: DROPSHIP_SCAN_INTENT.DUPLICATE, message: '请勿重复扫描同一码' }
	if (PALLET_NO_PATTERN.test(scanCode)) {
		const next = { ...state, activePalletNo: scanCode, lastScanCode: scanCode }
		return { state: next, intent: Number(unboundCartons) > 0 ? DROPSHIP_SCAN_INTENT.BIND_PENDING : DROPSHIP_SCAN_INTENT.SELECT_PALLET, palletNo: scanCode }
	}
	return { state: { ...state, pendingBoxCode: scanCode, lastScanCode: scanCode }, intent: DROPSHIP_SCAN_INTENT.RESOLVE_CARTON, boxCode: scanCode, palletNo: state.activePalletNo || null }
}

export function releaseDropshipScan(state, { clearBox = false } = {}) {
	return { ...createDropshipScanState(state), pendingBoxCode: clearBox ? '' : state.pendingBoxCode, lastScanCode: '' }
}