/**
 * NIMFinder Scraper — Pencarian Nama & NIM Mahasiswa Indonesia
 * Base: https://nimfinder.com
 * Supported Universities: ITB, UI, UGM, UNPAD, BINUS, UNDIP, ITS, IPB, UNAIR, UNBRAW, dll.
 */

import fetch from 'node-fetch'

const BASE_API = 'https://xg1kctvm70.execute-api.ap-southeast-1.amazonaws.com'
const USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36'

export const UNIVERSITIES = {
    itb: 'Institut Teknologi Bandung (ITB)',
    ui: 'Universitas Indonesia (UI)',
    ugm: 'Universitas Gadjah Mada (UGM)',
    unpad: 'Universitas Padjadjaran (UNPAD)',
    binus: 'Bina Nusantara (BINUS)',
    undip: 'Universitas Diponegoro (UNDIP)',
    its: 'Institut Teknologi Sepuluh Nopember (ITS)',
    ipb: 'IPB University (IPB)',
    unair: 'Universitas Airlangga (UNAIR)',
    unbraw: 'Universitas Brawijaya (UB/UNBRAW)',
    upi: 'Universitas Pendidikan Indonesia (UPI)',
    uns: 'Universitas Sebelas Maret (UNS)',
    unhas: 'Universitas Hasanuddin (UNHAS)',
    unnes: 'Universitas Negeri Semarang (UNNES)',
    trisakti: 'Universitas Trisakti (TRISAKTI)'
}

/**
 * Mencari data mahasiswa berdasarkan Nama atau NIM di universitas tertentu
 * @param {string} query Nama atau NIM mahasiswa (contoh: "budi", "13520001", "if21")
 * @param {string} univ Kode universitas (default: "itb", opsi: "ui", "ugm", "unpad", "binus", "undip", "its", "ipb", "unair", "unbraw")
 * @param {number} page Halaman hasil pencarian (default: 0)
 */
export async function searchNim(query, univ = 'itb', page = 0) {
    if (!query) throw new Error('Kata kunci pencarian (Nama atau NIM) tidak boleh kosong.')
    const targetUniv = univ.toLowerCase().trim()
    const validUniv = UNIVERSITIES[targetUniv] ? targetUniv : 'itb'

    try {
        const url = `${BASE_API}/mahasiswa_${validUniv}?query=${encodeURIComponent(query)}&page=${page}`
        const res = await fetch(url, {
            headers: {
                'Origin': 'https://nimfinder.com',
                'Referer': 'https://nimfinder.com/',
                'User-Agent': USER_AGENT,
                'Accept': 'application/json, text/plain, */*'
            }
        })

        if (!res.ok) throw new Error(`HTTP Error ${res.status}`)
        const json = await res.json()

        if (json.status !== 'OK') {
            throw new Error(json.message || 'Gagal mengambil data mahasiswa.')
        }

        const list = (json.payload || []).map(item => ({
            name: item.name || item.nama || 'N/A',
            nim_tpb: item.nim_tpb || null,
            nim_jurusan: item.nim_jur || item.nim || 'N/A',
            prodi: item.prodi || item.jurusan || 'N/A',
            fakultas: item.fakultas || null,
            status: item.status || 'Aktif',
            jenis_kelamin: item.jenis_kelamin || null
        }))

        return {
            university: UNIVERSITIES[validUniv],
            university_code: validUniv,
            query,
            total: json.total || list.length,
            page: json.page || page,
            results: list
        }
    } catch (e) {
        console.error('[NIMFinder Error]:', e.message)
        throw e
    }
}

/**
 * Mencari data mahasiswa di SEMUA universitas besar sekaligus
 * @param {string} query Nama atau NIM
 */
export async function searchNimAll(query) {
    if (!query) throw new Error('Query tidak boleh kosong.')
    const univCodes = Object.keys(UNIVERSITIES)
    const promises = univCodes.map(async (code) => {
        try {
            const data = await searchNim(query, code, 0)
            return {
                university: UNIVERSITIES[code],
                code,
                total: data.total,
                results: data.results.slice(0, 5)
            }
        } catch {
            return null
        }
    })

    const results = (await Promise.all(promises)).filter(r => r && r.results.length > 0)
    return {
        query,
        matched_universities: results.length,
        data: results
    }
}

export default {
    search: searchNim,
    searchAll: searchNimAll,
    UNIVERSITIES
}