"use strict";

const fs = require("fs");
const path = require("path");

const skillsRoot = require("./skills-root");
const scanner = require("./menu-entry-scanner");
const providers = require("./menu-providers");

function isDirectory(p) {
    try {
        return fs.statSync(p).isDirectory();
    } catch (e) {
        return false;
    }
}

function expandSubmenuChildren(entries, root, opts) {
    (entries || []).forEach(function (e) {
        if (!e || e.type !== "submenu") return;

        if (e.children && e.children.length) return;
        if (!e.childrenDir) return;

        let dir = e.childrenDir;
        if (typeof dir !== "string" || dir.trim().length === 0) return;
        dir = dir.trim();

        const resolved = (dir.charAt(0) === "/") ? dir : path.join(root, dir);
        if (!isDirectory(resolved)) {
            if (opts && opts.log) opts.log("submenu childrenDir not a directory", e.id, resolved);
            e.children = [];
            return;
        }

        if (opts && opts.log) opts.log("submenu childrenDir scan", e.id, resolved);
        e.children = scanner.scanSubmenuChildren(resolved, { log: opts && opts.log, defaultIcon: opts && opts.defaultIcon, defaultColor: opts && opts.defaultColor, defaultOrder: opts && opts.defaultOrder });
    });
}

function getMenuEntries(opts) {
    opts = opts || {};
    const root = skillsRoot.resolveSkillsRoot(opts.skillsRoot);
    const providerDir = opts.providersDir || skillsRoot.providersDirForRoot(root);

    const scanned = scanner.scanAllMenuEntries(root, {
        log: opts.log,
        defaultIcon: opts.defaultIcon,
        defaultColor: opts.defaultColor,
        defaultOrder: opts.defaultOrder
    });

    const provided = providers.loadProviderEntries(providerDir, { log: opts.log, skillsRoot: root, providersDir: providerDir });
    const merged = providers.mergeById(scanned, provided);

    // Allow provider-defined submenus to be backed by an arbitrary directory.
    // Example: { type: "submenu", id: "fun", childrenDir: "FunStuff" }
    expandSubmenuChildren(merged, root, opts);

    const dynamicIds = scanner.collectDynamicSkillIds(merged);

    return {
        skillsRoot: root,
        providersDir: providerDir,
        entries: merged,
        dynamicSkillIds: dynamicIds
    };
}

module.exports = {
    getMenuEntries: getMenuEntries
};