"use strict";
/**
 * Skills Scanner - Scans the Skills directory for menuEntry.json files
 * 
 * menuEntry.json Schema:
 * {
 *   "type": "skill" | "submenu",       // Required: "skill" for launchable skill, "submenu" for folder containing skills
 *   "title": "Display Name",           // Required: Button label shown on Jibo's screen
 *   "icon": "path/to/icon.png",        // Required: Icon path (relative to skill folder or core:// URL)
 *   "color": "blue",                   // Optional: Button color theme (default, blue, green, red, purple, orange, etc.)
 *   "skillId": "@namespace/skill-id",  // Required for type="skill": The skill ID to launch
 *   "description": "Short description",// Optional: Tooltip/accessibility text
 *   "order": 0,                        // Optional: Sort order (lower = first, default: 100)
 *   "hidden": false                    // Optional: Hide from menu (default: false)
 * }
 */

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

// Default icon path for skills without custom icons (relative to @be/main-menu)
const DEFAULT_ICON = 'resources/icons/settings.png';
const DEFAULT_SUBMENU_ICON = 'resources/icons/fun-stuff.png';
const DEFAULT_COLOR = 'default';
const DEFAULT_ORDER = 100;

/**
 * Safely read and parse a JSON file
 * @param {string} filePath - Path to JSON file
 * @returns {object|null} Parsed JSON or null on error
 */
function safeReadJson(filePath) {
    try {
        const txt = fs.readFileSync(filePath, 'utf8');
        if (!txt || txt.trim().length === 0) return null;
        return JSON.parse(txt);
    }
    catch (e) {
        console.warn('skills-scanner: failed to read json', filePath, e.message);
        return null;
    }
}

/**
 * Check if path is a directory
 * @param {string} p - Path to check
 * @returns {boolean}
 */
function isDirectory(p) {
    try {
        return fs.statSync(p).isDirectory();
    }
    catch (e) { return false; }
}

/**
 * Scan a single skill directory and return menu entry
 * @param {string} skillDir - Full path to skill directory
 * @param {string} folderName - Name of the folder
 * @returns {object|null} Menu entry object or null if invalid
 */
function scanSkillEntry(skillDir, folderName) {
    const menuJsonPath = path.join(skillDir, 'menuEntry.json');
    const menuJson = safeReadJson(menuJsonPath);
    
    if (!menuJson) {
        // No menuEntry.json - check if it's a valid skill by looking for package.json or index.html
        const hasPackage = fs.existsSync(path.join(skillDir, 'package.json'));
        const hasIndex = fs.existsSync(path.join(skillDir, 'index.html'));
        if (hasPackage || hasIndex) {
            // Auto-generate entry for legacy skills
            return {
                id: folderName,
                type: 'skill',
                title: folderName,
                icon: DEFAULT_ICON,
                color: DEFAULT_COLOR,
                skillId: folderName,
                path: skillDir,
                order: DEFAULT_ORDER,
                hidden: false
            };
        }
        return null;
    }
    
    // Validate required fields
    if (menuJson.hidden === true) {
        return null; // Skip hidden entries
    }
    
    const entry = {
        id: folderName,
        type: menuJson.type || 'skill',
        title: menuJson.title || menuJson.label || folderName,
        icon: menuJson.icon || menuJson.iconSrc || (menuJson.type === 'submenu' ? DEFAULT_SUBMENU_ICON : DEFAULT_ICON),
        color: menuJson.color || menuJson.colors || DEFAULT_COLOR,
        description: menuJson.description || '',
        path: skillDir,
        order: typeof menuJson.order === 'number' ? menuJson.order : DEFAULT_ORDER,
        hidden: menuJson.hidden === true
    };
    
    // For skills, include skillId
    if (entry.type === 'skill') {
        entry.skillId = menuJson.skillId || folderName;
    }
    
    // For submenus, scan child directories
    if (entry.type === 'submenu') {
        entry.submenu = scanSubmenuChildren(skillDir);
        // Copy submenu-specific properties
        if (menuJson.submenuTitle) {
            entry.submenuTitle = menuJson.submenuTitle;
        }
    }
    
    // Support for legacy isSubmenu flag
    if (menuJson.isSubmenu === true && entry.type !== 'submenu') {
        entry.type = 'submenu';
        entry.submenu = scanSubmenuChildren(skillDir);
    }
    
    return entry;
}

/**
 * Scan children of a submenu directory
 * @param {string} submenuDir - Path to submenu directory
 * @returns {Array} Array of skill entries
 */
function scanSubmenuChildren(submenuDir) {
    const children = [];
    let items;
    try {
        items = fs.readdirSync(submenuDir);
    } catch (e) {
        return children;
    }
    
    items.forEach(name => {
        // Skip hidden folders and @be
        if (name.startsWith('.') || name === '@be') return;
        
        const childPath = path.join(submenuDir, name);
        if (!isDirectory(childPath)) return;
        
        const entry = scanSkillEntry(childPath, name);
        if (entry && entry.type === 'skill') {
            children.push(entry);
        }
        // Note: Nested submenus within submenus are not supported (single level only)
    });
    
    // Sort by order, then alphabetically
    children.sort((a, b) => {
        if (a.order !== b.order) return a.order - b.order;
        return a.title.localeCompare(b.title);
    });
    
    return children;
}

/**
 * Scan the Skills root directory for all menu entries
 * @param {string} rootDir - Path to Skills directory
 * @returns {Array} Array of menu entries
 */
function scanDirForMenuEntries(rootDir) {
    const entries = [];
    let children;
    try {
        children = fs.readdirSync(rootDir);
    } catch (e) {
        console.warn('skills-scanner: failed to read skills directory', rootDir, e.message);
        return entries;
    }
    
    children.forEach(name => {
        // Skip hidden folders and @be (it's the core brain, not a menu item)
        if (name.startsWith('.') || name === '@be') return;
        
        const skillDir = path.join(rootDir, name);
        if (!isDirectory(skillDir)) return;
        
        const entry = scanSkillEntry(skillDir, name);
        if (entry) {
            entries.push(entry);
        }
    });
    
    // Sort by order, then alphabetically
    entries.sort((a, b) => {
        if (a.order !== b.order) return a.order - b.order;
        return a.title.localeCompare(b.title);
    });
    
    return entries;
}

/**
 * Scan skills directory and return menu definition
 * @param {string} rootDir - Path to Skills directory
 * @returns {object} Menu definition with buttons array
 */
function scanSkills(rootDir) {
    const entries = scanDirForMenuEntries(rootDir);
    
    const menuDef = {
        id: 'main-menu',
        title: 'Apps',
        buttons: []
    };
    
    entries.forEach(entry => {
        const button = {
            id: entry.id,
            label: entry.title,
            icon: entry.icon,
            colors: entry.color,
            description: entry.description
        };
        
        if (entry.type === 'submenu' && entry.submenu) {
            // For submenus, include the submenu array and metadata
            button.submenu = entry.submenu.map(s => ({
                id: s.id,
                label: s.title,
                icon: s.icon,
                colors: s.color,
                skillId: s.skillId,
                description: s.description
            }));
            button.submenuTitle = entry.submenuTitle || entry.title;
            button.submenuPath = entry.path;
        } else {
            // Regular skill
            button.skillId = entry.skillId;
        }
        
        menuDef.buttons.push(button);
    });
    
    return menuDef;
}

/**
 * Get a specific submenu's contents by path
 * @param {string} submenuPath - Path to the submenu directory
 * @returns {object} Menu definition for the submenu
 */
function getSubmenu(submenuPath) {
    const menuJsonPath = path.join(submenuPath, 'menuEntry.json');
    const menuJson = safeReadJson(menuJsonPath) || {};
    const folderName = path.basename(submenuPath);
    
    const entries = scanSubmenuChildren(submenuPath);
    
    return {
        id: folderName + '-submenu',
        title: menuJson.submenuTitle || menuJson.title || folderName,
        isSubmenu: true,
        parentPath: path.dirname(submenuPath),
        buttons: entries.map(entry => ({
            id: entry.id,
            label: entry.title,
            icon: entry.icon,
            colors: entry.color,
            skillId: entry.skillId,
            description: entry.description
        }))
    };
}

/**
 * Get all registered skills (flat list for skill loading)
 * @param {string} rootDir - Path to Skills directory
 * @returns {Array} Array of skill IDs
 */
function getAllSkillIds(rootDir) {
    const skillIds = [];
    const entries = scanDirForMenuEntries(rootDir);
    
    entries.forEach(entry => {
        if (entry.type === 'skill' && entry.skillId) {
            skillIds.push(entry.skillId);
        } else if (entry.type === 'submenu' && entry.submenu) {
            entry.submenu.forEach(s => {
                if (s.skillId) skillIds.push(s.skillId);
            });
        }
    });
    
    return skillIds;
}

module.exports = {
    scanSkills,
    scanDirForMenuEntries,
    getSubmenu,
    getAllSkillIds,
    DEFAULT_ICON,
    DEFAULT_SUBMENU_ICON,
    DEFAULT_COLOR
};