import { apiJSON, apiMutate } from '$lib/api/client.js';
import type { AppSettings } from '$lib/api/types.js';
import { emptyBirdSettingsForm, type BirdSettingsForm } from './bird-settings.schema.js';
import {
	emptyRevisionSettingsForm,
	type RevisionSettingsForm
} from './revision-settings.schema.js';
import {
	BIRD_SETTING_KEYS,
	KNOWN_SETTING_KEYS,
	NUMERIC_SETTING_KEYS,
	type BirdSettingKey,
	type KnownSettingKey,
	type RevisionSettingKey
} from './settings-known-keys.js';

export type AdditionalSettingEntry = { id: number; key: string; value: string };

export type PartitionedSettings = {
	bird: BirdSettingsForm;
	revision: RevisionSettingsForm;
	additional: AdditionalSettingEntry[];
};

function parseKnownValue(key: KnownSettingKey, value: unknown): string {
	if (NUMERIC_SETTING_KEYS.has(key)) {
		if (typeof value === 'number' && Number.isFinite(value)) return String(value);
		if (typeof value === 'string') return value;
		return '';
	}
	if (typeof value === 'string') return value;
	return '';
}

export function partitionSettings(
	settings: AppSettings,
	nextId = 1
): { partitioned: PartitionedSettings; nextId: number } {
	const bird = emptyBirdSettingsForm();
	const revision = emptyRevisionSettingsForm();
	const additional: AdditionalSettingEntry[] = [];
	let idCounter = nextId;

	for (const [key, value] of Object.entries(settings as Record<string, unknown>)) {
		if ((BIRD_SETTING_KEYS as readonly string[]).includes(key)) {
			bird[key as BirdSettingKey] = parseKnownValue(key as KnownSettingKey, value);
		} else if (key === 'revision_retention_minutes') {
			revision.revision_retention_minutes = parseKnownValue(key as RevisionSettingKey, value);
		} else {
			additional.push({
				id: idCounter++,
				key,
				value: typeof value === 'string' ? value : String(value)
			});
		}
	}

	return {
		partitioned: { bird, revision, additional },
		nextId: idCounter
	};
}

export async function loadSettings(): Promise<AppSettings> {
	return apiJSON<AppSettings>('/v1/settings');
}

export async function patchSettings(payload: Record<string, string | number>): Promise<void> {
	await apiMutate('/v1/settings', 'PATCH', payload);
}

export function buildPayloadFromFormFields(
	keys: readonly KnownSettingKey[],
	form: Record<string, string>,
	errors: Partial<Record<string, string[]>>
): Record<string, string | number> {
	const payload: Record<string, string | number> = {};
	for (const key of keys) {
		const value = String(form[key] ?? '').trim();
		if (!value || errors[key]?.length) continue;
		if (NUMERIC_SETTING_KEYS.has(key)) payload[key] = Number(value);
		else payload[key] = value;
	}
	return payload;
}

export function isKnownSettingKey(key: string): key is KnownSettingKey {
	return (KNOWN_SETTING_KEYS as readonly string[]).includes(key);
}