// Plugin parity between paired peers: presence + version of every installed
// plugin. Applying state that references a plugin the
// peer lacks (or runs at another version) can fail, so the admin is warned before
// a sync. Plugin CONFIG is never compared or sent here, only names and versions.


// This tenant's installed plugins ({ name, source, version }, by name). Schema-
// qualified so a sub-tenant never reads the root tenant's plugin list.
const localPluginList = async () => {
    const db     = require("@saltcorn/data/db");
    const schema = db.getTenantSchemaPrefix();
    return (await db.query(`SELECT name, source, version FROM ${schema}_sc_plugins ORDER BY name`)).rows;
};


// Human-readable warnings (empty when both lists match).
const comparePluginLists = (localPlugins, peerPlugins) => {
    const localByName = new Map(localPlugins.map((pl) => [pl.name, pl]));
    const peerByName  = new Map(peerPlugins.map((pl) => [pl.name, pl]));
    const warnings    = [];
    for (const [name, mine] of localByName) {
        const theirs = peerByName.get(name);
        if (!theirs) {
            warnings.push(`peer missing plugin "${name}"`);
        } else if ((mine.version || "") !== (theirs.version || "")) {
            warnings.push(`plugin version mismatch on "${name}": local ${mine.version || "?"}, peer ${theirs.version || "?"}`);
        }
    }
    for (const name of peerByName.keys()) {
        if (!localByName.has(name)) {
            warnings.push(`peer has plugin not installed here: "${name}"`);
        }
    }
    return warnings;
};


module.exports = {
    localPluginList,
    comparePluginLists
};