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import { buildStickerId, parseStickerId } from "../sticker-id";
import type {
StickerItem,
StickerProvider,
StickerSearchResult,
} from "../types";
const FLAGS_PROVIDER_ID = "flags";
const FLAGS_DATASET_URL = "/countries.json";
const DEFAULT_SEARCH_LIMIT = 100;
const DEFAULT_FLAGS_BASE_URL = "/flags";
type CountryRecord = {
name: string;
code: string;
languages?: string[];
flag_colors?: string[];
region?: string;
};
let countriesPromise: Promise<CountryRecord[]> | null = null;
function getFlagsBaseUrl(): string {
return DEFAULT_FLAGS_BASE_URL.replace(/\/$/, "");
}
function buildFlagUrl({ code }: { code: string }): string {
const normalizedCode = code.toUpperCase();
return `${getFlagsBaseUrl()}/${encodeURIComponent(normalizedCode)}.svg`;
}
async function loadCountries(): Promise<CountryRecord[]> {
if (countriesPromise) {
return countriesPromise;
}
countriesPromise = fetch(FLAGS_DATASET_URL)
.then(async (response) => {
if (!response.ok) {
throw new Error(`Failed to load countries: ${response.status}`);
}
return (await response.json()) as CountryRecord[];
})
.catch((error) => {
console.error("Failed to load countries dataset:", error);
return [];
});
return countriesPromise;
}
function toStickerItem({ country }: { country: CountryRecord }): StickerItem {
const normalizedCode = country.code.toUpperCase();
return {
id: buildStickerId({
providerId: FLAGS_PROVIDER_ID,
providerValue: normalizedCode,
}),
provider: FLAGS_PROVIDER_ID,
name: country.name,
previewUrl: buildFlagUrl({ code: normalizedCode }),
metadata: {
code: normalizedCode,
region: country.region ?? null,
languages: country.languages ?? [],
flagColors: country.flag_colors ?? [],
},
};
}
function normalizeQuery({ query }: { query: string }): string {
return query.trim().toLowerCase();
}
function filterCountriesByQuery({
countries,
query,
}: {
countries: CountryRecord[];
query: string;
}): CountryRecord[] {
if (!query) {
return countries;
}
return countries.filter((country) => {
const normalizedName = country.name.toLowerCase();
const normalizedCode = country.code.toLowerCase();
const normalizedRegion = country.region?.toLowerCase() ?? "";
return (
normalizedName.includes(query) ||
normalizedCode.includes(query) ||
normalizedRegion.includes(query)
);
});
}
function paginateCountries({
countries,
options,
}: {
countries: CountryRecord[];
options?: { page?: number; limit?: number };
}): { items: CountryRecord[]; hasMore: boolean; total: number } {
const page = Math.max(1, options?.page ?? 1);
const limit = Math.max(1, options?.limit ?? DEFAULT_SEARCH_LIMIT);
const startIndex = (page - 1) * limit;
const endIndex = startIndex + limit;
const pagedItems = countries.slice(startIndex, endIndex);
return {
items: pagedItems,
hasMore: endIndex < countries.length,
total: countries.length,
};
}
export const flagsProvider: StickerProvider = {
id: FLAGS_PROVIDER_ID,
async search({
query,
options,
}: {
query: string;
options?: { limit?: number };
}): Promise<StickerSearchResult> {
const countries = await loadCountries();
const normalizedQuery = normalizeQuery({ query });
const filteredCountries = filterCountriesByQuery({
countries,
query: normalizedQuery,
});
const paged = paginateCountries({
countries: filteredCountries,
options: {
page: 1,
limit: options?.limit ?? DEFAULT_SEARCH_LIMIT,
},
});
return {
items: paged.items.map((country) => toStickerItem({ country })),
total: paged.total,
hasMore: paged.hasMore,
};
},
async browse({
options,
}: {
options?: { page?: number; limit?: number };
}): Promise<StickerSearchResult> {
const countries = await loadCountries();
const paged = paginateCountries({ countries, options });
return {
items: paged.items.map((country) => toStickerItem({ country })),
total: paged.total,
hasMore: paged.hasMore,
};
},
resolveUrl({
stickerId,
}: {
stickerId: string;
options?: { width?: number; height?: number };
}): string {
const { providerValue } = parseStickerId({ stickerId });
return buildFlagUrl({ code: providerValue });
},
};
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