// Server-side API helpers for metadata generation.
// Runs only on the server (Node.js) — uses NEXT_PUBLIC_HOST_URL which is inlined at build time.

import { IMod } from '@/src/types/Imod';

const API = process.env.NEXT_PUBLIC_HOST_URL || '';
export const SITE_URL = process.env.NEXT_PUBLIC_SITE_URL || 'https://dow-wiki.example.com';

async function fetchJson<T>(url: string): Promise<T | null> {
    try {
        const res = await fetch(url, { cache: 'no-store' });
        if (!res.ok) return null;
        return (await res.json()) as T;
    } catch {
        return null;
    }
}

export async function getMod(modId: string) {
    return fetchJson<{ name: string; version: string }>(`${API}/api/v1/mods/${modId}`);
}

export async function getRace(raceId: string) {
    return fetchJson<{ name: string }>(`${API}/api/v1/races/${raceId}`);
}

export async function getUnit(unitId: string) {
    return fetchJson<{ name: string; description: string }>(`${API}/api/v1/units/${unitId}`);
}

export async function getBuilding(buildingId: string) {
    return fetchJson<{ name: string; filename: string }>(`${API}/api/v1/buildings/${buildingId}`);
}

export async function getMods() {
    return fetchJson<IMod[]>(`${API}/api/v1/mods`);
}

export async function getRacesForMod(modId: string | number) {
    return fetchJson<Array<{ race: { id: string; name: string } }>>(`${API}/api/v1/units/mod/${modId}`);
}

export async function getUnitsForMod(modId: string | number) {
    return fetchJson<Array<{ race: { id: string }; infantry: Array<{ id: number }>; support: Array<{ id: number }>; tech: Array<{ id: number }> }>>(`${API}/api/v1/units/mod/${modId}`);
}

export async function getBuildingsForMod(modId: string | number) {
    return fetchJson<Array<{ race: { id: string }; buildings: Array<{ id: number }>; buildingsAdvanced: Array<{ id: number }> }>>(`${API}/api/v1/buildings/mod/${modId}`);
}