import { SNIPPET_TYPE_SCOPES } from '../../types/Snippet'
import { isNetworkAdmin } from '../screen'
import type { Snippet, SnippetScope } from '../../types/Snippet'

const TUPLE_SIZE = 2

const defaults: Omit<Snippet, 'tags'> = {
	id: 0,
	name: '',
	code: '',
	desc: '',
	scope: 'global',
	modified: '',
	active: false,
	locked: false,
	trashed: false,
	network: isNetworkAdmin(),
	shared_network: null,
	priority: 10,
	conditionId: 0,
	code_error: null,
	code_error_trace: null
}

const isAbsInt = (value: unknown): value is number =>
	'number' === typeof value && 0 < value

const parseStringArray = (value: unknown): string[] | undefined =>
	Array.isArray(value) ? value.filter(entry => 'string' === typeof entry) : undefined

const isCodeError = (value: unknown): value is readonly [string, number] =>
	Array.isArray(value) && TUPLE_SIZE === value.length &&
	'string' === typeof value[0] && 'number' === typeof value[1]

export const isValidScope = (scope: unknown): scope is SnippetScope =>
	'string' === typeof scope && Object.values(SNIPPET_TYPE_SCOPES).some(typeScopes =>
		typeScopes.some(typeScope => typeScope === scope))

export const parseSnippetObject = (fields: unknown): Snippet => {
	const result: { -readonly [F in keyof Snippet]: Snippet[F] } = { ...defaults, tags: [] }

	if ('object' !== typeof fields || null === fields) {
		return result
	}

	return {
		...result,
		...'id' in fields && isAbsInt(fields.id) && { id: fields.id },
		...'name' in fields && 'string' === typeof fields.name && { name: fields.name },
		...'desc' in fields && 'string' === typeof fields.desc && { desc: fields.desc },
		...'code' in fields && 'string' === typeof fields.code && { code: fields.code },
		...'tags' in fields && { tags: parseStringArray(fields.tags) ?? result.tags },
		...'scope' in fields && isValidScope(fields.scope) && { scope: fields.scope },
		...'modified' in fields && 'string' === typeof fields.modified && { modified: fields.modified },
		...'active' in fields && 'boolean' === typeof fields.active && { active: fields.active },
		...'locked' in fields && 'boolean' === typeof fields.locked && { locked: fields.locked },
		...'trashed' in fields && 'boolean' === typeof fields.trashed && { trashed: fields.trashed },
		...'network' in fields && 'boolean' === typeof fields.network && { network: fields.network },
		...'shared_network' in fields && 'boolean' === typeof fields.shared_network && { shared_network: fields.shared_network },
		...'priority' in fields && 'number' === typeof fields.priority && { priority: fields.priority },
		...'conditionId' in fields && isAbsInt(fields.conditionId) && { conditionId: fields.conditionId },
		...'condition_id' in fields && isAbsInt(fields.condition_id) && { conditionId: fields.condition_id },
		...'code_error' in fields && isCodeError(fields.code_error) && { code_error: fields.code_error },
		...'code_error_trace' in fields &&
		('string' === typeof fields.code_error_trace || null === fields.code_error_trace) && { code_error_trace: fields.code_error_trace },
		...'last_active' in fields && { lastActive: Number(fields.last_active) },
	}
}