import crypto from "crypto";
import db from "./db.js";
import { fetchManifest, fetchRepo, normalizeRepoInput } from "./pluginService.js";

function toIso(value) {
    return value ? new Date(value).toISOString() : null;
}

export function generateLicenseKey() {
    const raw = crypto.randomBytes(8).toString("hex").toUpperCase();
    const segments = raw.match(/.{1,4}/g) || [];
    return `SITI-${segments.slice(0, 4).join("-")}`;
}

export function normalizeHostname(value) {
    return value ? value.trim().toLowerCase() : null;
}

export async function listLicensesByUser(userId) {
    const [rows] = await db.query(`SELECT * FROM licenses WHERE user_id = ? ORDER BY created_at DESC`, [userId]);
    return Promise.all(rows.map((row) => buildLicensePayload(row)));
}

export async function getLicenseById(id) {
    const [rows] = await db.query(`SELECT * FROM licenses WHERE id = ? LIMIT 1`, [id]);
    return rows[0] || null;
}

export async function findLicenseByKey(key) {
    const [rows] = await db.query(`SELECT * FROM licenses WHERE license_key = ? LIMIT 1`, [key]);
    return rows[0] || null;
}

export async function createLicense(userId, { label, note, repo }) {
    const repoEntry = normalizeRepoInput(repo);
    if (!repoEntry) {
        const error = new Error("Ongeldige plugin referentie.");
        error.meta = "INVALID_REPO";
        throw error;
    }

    let licenseId = null;
    for (let attempt = 0; attempt < 5; attempt += 1) {
        const id = crypto.randomUUID();
        const licenseKey = generateLicenseKey();
        try {
            await db.query(
                `INSERT INTO licenses (
                    id, user_id, license_key, label, note,
                    repo_provider, repo_name, repo_base_url,
                    created_at, updated_at
                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, NOW(), NOW())`,
                [
                    id,
                    userId,
                    licenseKey,
                    label || repoEntry.repo,
                    note || null,
                    repoEntry.provider || "github",
                    repoEntry.repo,
                    repoEntry.baseUrl || (repoEntry.provider === "github" ? "https://github.com" : null)
                ]
            );
            licenseId = id;
            break;
        } catch (error) {
            if (error?.code === "ER_DUP_ENTRY") {
                continue;
            }
            throw error;
        }
    }

    if (!licenseId) {
        throw new Error("Kon licentie niet opslaan.");
    }

    return buildLicensePayload(await getLicenseById(licenseId));
}

export async function buildLicensePayload(row) {
    if (!row) return null;
    const repoEntry = normalizeRepoInput({
        repo: row.repo_name,
        provider: row.repo_provider,
        baseUrl: row.repo_base_url
    });
    const [hostnameRows] = await db.query(
        `SELECT hostname, normalized, first_seen_at, last_seen_at, hits
         FROM license_hostnames WHERE license_id = ? ORDER BY first_seen_at ASC`,
        [row.id]
    );
    const hostnames = hostnameRows.map((entry) => ({
        hostname: entry.hostname,
        normalized: entry.normalized,
        firstSeenAt: toIso(entry.first_seen_at),
        lastSeenAt: toIso(entry.last_seen_at),
        hits: entry.hits
    }));

    if (!repoEntry) {
        return {
            id: row.id,
            key: row.license_key,
            label: row.label,
            note: row.note,
            hostnames,
            createdAt: toIso(row.created_at),
            updatedAt: toIso(row.updated_at),
            lastVersionCheckAt: toIso(row.last_version_check_at),
            primaryHostname: row.primary_hostname,
            primaryHostnameNormalized: row.primary_hostname_normalized,
            repoFullName: row.repo_name,
            repoUrl: null,
            pluginName: row.label,
            pluginVersion: row.last_used_version || null,
            lastUsedVersion: row.last_used_version,
            repo: null
        };
    }

    try {
        const info = await fetchRepo(repoEntry);
        const manifest = await fetchManifest(repoEntry, info.defaultBranch).catch(() => null);
        return {
            id: row.id,
            key: row.license_key,
            label: row.label,
            note: row.note,
            createdAt: toIso(row.created_at),
            updatedAt: toIso(row.updated_at),
            lastVersionCheckAt: toIso(row.last_version_check_at),
            primaryHostname: row.primary_hostname,
            primaryHostnameNormalized: row.primary_hostname_normalized,
            repoFullName: info.fullName,
            repoUrl: info.repoUrl,
            pluginName: manifest?.plugin_name || info.name || row.label,
            pluginVersion: manifest?.version || row.last_used_version || null,
            lastUsedVersion: row.last_used_version,
            repo: repoEntry,
            hostnames
        };
    } catch (error) {
        return {
            id: row.id,
            key: row.license_key,
            label: row.label,
            note: row.note,
            createdAt: toIso(row.created_at),
            updatedAt: toIso(row.updated_at),
            lastVersionCheckAt: toIso(row.last_version_check_at),
            primaryHostname: row.primary_hostname,
            primaryHostnameNormalized: row.primary_hostname_normalized,
            repoFullName: row.repo_name,
            repoUrl: repoEntry?.baseUrl ? `${repoEntry.baseUrl.replace(/\/$/, "")}/${row.repo_name}` : null,
            pluginName: row.label,
            pluginVersion: row.last_used_version || null,
            lastUsedVersion: row.last_used_version,
            repo: repoEntry,
            hostnames
        };
    }
}

export async function touchLicenseHostname(license, hostname, options = {}) {
    const normalizedHost = normalizeHostname(hostname);
    if (!normalizedHost) {
        return { ok: false, error: "Ongeldige hostname." };
    }
    const trimmed = hostname.trim();
    const rawVersion =
        typeof options?.pluginVersion === "string" && options.pluginVersion.trim().length > 0
            ? options.pluginVersion.trim()
            : null;
    const pluginVersion = rawVersion ? rawVersion.slice(0, 64) : null;

    const updateFields = [];
    const params = [];

    if (!license.primary_hostname_normalized) {
        updateFields.push("primary_hostname = ?", "primary_hostname_normalized = ?");
        params.push(trimmed, normalizedHost);
    } else if (license.primary_hostname_normalized !== normalizedHost) {
        return {
            ok: false,
            conflict: true,
            error: `Licentie hoort bij ${license.primary_hostname || "een andere site"}.`
        };
    } else {
        // No hostname change, but still keep the hostname casing in sync.
        updateFields.push("primary_hostname = ?");
        params.push(trimmed);
    }

    updateFields.push("last_version_check_at = NOW()", "updated_at = NOW()");

    if (pluginVersion) {
        updateFields.push("last_used_version = ?");
        params.push(pluginVersion);
    }

    await db.query(`UPDATE licenses SET ${updateFields.join(", ")} WHERE id = ?`, [...params, license.id]);

    await db.query(
        `INSERT INTO license_hostnames (license_id, hostname, normalized, first_seen_at, last_seen_at, hits)
         VALUES (?, ?, ?, NOW(), NOW(), 1)
         ON DUPLICATE KEY UPDATE hostname = VALUES(hostname), last_seen_at = NOW(), hits = hits + 1`,
        [license.id, trimmed, normalizedHost]
    );

    return { ok: true, boundNow: !license.primary_hostname_normalized, normalized: normalizedHost };
}