// module-agent-registry.js — VFS-backed agent directory with A2A contracts
// Commands: agent-list, agent-register, agent-unregister, agent-status, contract-register, contract-list
// A2A Scratchpad commands: a2a-post, a2a-poll, a2a-ack, a2a-reject, a2a-status, a2a-prune
class AgentRegistryModule {
    constructor() {
        this.commands = {};
        this.terminal = null;
        this._contracts = {};
        this._a2aPruneTimer = null;
    }
    registerCommands() {
        this.commands['agent-list'] = () => this.listAgents();
        this.commands['agent-status'] = (args) => this.showAgentStatus(args[0]);
        this.commands['agent-register'] = (args) => this.registerAgent(args);
        this.commands['agent-unregister'] = (args) => this.unregisterAgent(args[0]);
        this.commands['contract-register'] = (args) => this.registerContract(args);
        this.commands['contract-list'] = () => this.listContracts();
        // A2A Scratchpad commands
        this.commands['a2a-post'] = (args) => this.a2aPostCommand(args);
        this.commands['a2a-poll'] = (args) => this.a2aPollCommand(args);
        this.commands['a2a-ack'] = (args) => this.a2aAckCommand(args);
        this.commands['a2a-reject'] = (args) => this.a2aRejectCommand(args);
        this.commands['a2a-status'] = () => this.a2aStatus();
        this.commands['a2a-prune'] = () => this.a2aPrune();
    }
    getHelpInfo() {
        return {
            'a2a-post': 'a2a-post <to> <type> <capability> <payload...> — Post an A2A message',
            'a2a-poll': 'a2a-poll [agentId] — Poll for messages addressed to an agent (default: current or "user")',
            'a2a-ack': 'a2a-ack <msgId> <result...> — Acknowledge a message with result',
            'a2a-reject': 'a2a-reject <msgId> <error...> — Reject a message with error',
            'a2a-status': 'a2a-status — Show scratchpad stats per agent',
            'a2a-prune': 'a2a-prune — Clean up expired and old completed messages'
        };
    }
    init(terminal) {
        this.terminal = terminal;
        if (!this.terminal.fs.readDir('/agents/')) this.terminal.fs.mkdirRecursive('/agents');
        if (!this.terminal.fs.readDir('/.contracts/')) this.terminal.fs.mkdirRecursive('/.contracts');
        this._loadContracts();
        // Initialize scratchpad
        this._ensureScratchpad();
        // Auto-prune every 60 seconds
        this._a2aPruneTimer = setInterval(() => this.a2aPrune(), 60000);
        // Save the spec-vs-reality delta table
        this._saveDeltaTable();
        this.terminal.print('📋 Agent Registry loaded', 'info');
    }
    // ─── Task 1: Save spec-vs-reality delta table ───
    _saveDeltaTable() {
        try {
            const fs = this.terminal.fs;
            if (!fs.readDir('/_docs/')) fs.mkdirRecursive('/_docs');
            const delta = `# Spec-vs-Reality Delta — 2026-06-17\n\n` +
`| # | Whitepaper Concept | Spec'd Behavior | Current Reality | Δ | Priority |\n` +
`|---|---|---|---|---|---|\n` +
`| 1 | Hyper-Modular Kernel | Real-time self-rewriting drivers for task-specific optimization via WPM | WPM exists but is manual; no hot-patch daemon or runtime driver swap | Partial | Medium |\n` +
`| 2 | A2A Protocol | Standardized neural communication layer for agent negotiation; typed messages, no central broker | VFS mailbox transport works (a2a-send/a2a-list/500ms polling) but orchestrator acts as central broker | Partial | High |\n` +
`| 3 | Neural VFS | Semantic-based file storage (concept:// URIs) as primary access method; hierarchical paths are secondary | concept:// URIs work (nvfs-index/nvfs-resolve) but hierarchical paths remain primary access; concept resolution requires explicit index | Partial | High |\n` +
`| 4 | Recursive Self-Optimization | Monitor → Profile → Diagnose → Patch → Test → Promote feedback loop | system-health telemetry captures latency/VFS stats but no auto-patch generation or hot-promotion pipeline | Partial | Medium |\n` +
`| 5 | Agent Discovery | No central broker — agents discover each other via VFS registrations spontaneously | Orchestrator is central broker; all task delegation goes through it; agents don't autonomously discover each other | Critical Gap | Critical |\n` +
`| 6 | Contract Schema | Every A2A message carries a contract schema defining capabilities and constraints | Contracts exist (contract-register/contract-list) but schema validation is basic substring matching; not enforced on every message | Partial | Medium |\n` +
`| 7 | Semantic Addressing | Neural VFS as primary storage paradigm — users navigate by concept, not path | Hierarchical path access still primary; concept:// requires explicit nvfs-index; no transparent concept-to-path fallback | Critical Gap | Critical |\n` +
`| 8 | Warm-start Guarantee | Kernel caches last N stable driver configs; boot in under 200ms | No golden config cache; full localStorage restore on every page load | Spec Violation | High |\n` +
`| 9 | Self-rewrite Daemon | Monitors performance telemetry and generates optimized driver variants at runtime | No self-rewrite daemon exists; all module changes are manual | Missing | Low |\n` +
`| 10 | Agent Lifecycle | spawn, sleep, wake, kill, restart policies with exponential backoff | Fully implemented in orchestrator with heartbeat, idle sweep, restart policies, VFS sleep serialization | Fully Aligned | — |\n\n` +
`**Summary: 2 Critical gaps, 5 Partial, 1 Spec Violation, 1 Missing, 1 Fully Aligned**\n`;
            fs.writeFile('_docs/spec-vs-reality-delta.md', delta);
            this.terminal.print('📄 Spec-vs-Reality delta saved to /_docs/spec-vs-reality-delta.md', 'info');
        } catch (e) {
            console.warn('Failed to save delta table:', e.message);
        }
    }
    // ─── A2A Scratchpad Helpers ───
    _ensureScratchpad() {
        try {
            const data = this.terminal.fs.fsReadJSON('/_agents/scratchpad.json');
            if (!data) throw new Error('no scratchpad');
        } catch (e) {
            this.terminal.fs.mkdirRecursive('/_agents');
            this.terminal.fs.fsWriteJSON('/_agents/scratchpad.json', {
                messages: [],
                seq: 0,
                agents: {}
            });
        }
    }
    _getScratchpad() {
        try {
            const data = this.terminal.fs.fsReadJSON('/_agents/scratchpad.json');
            if (data && data.messages) return data;
        } catch (e) {}
        return { messages: [], seq: 0, agents: {} };
    }
    _saveScratchpad(sp) {
        try {
            this.terminal.fs.mkdirRecursive('/_agents');
            this.terminal.fs.fsWriteJSON('/_agents/scratchpad.json', sp);
        } catch (e) {
            console.warn('Scratchpad save error:', e.message);
        }
    }
    // ─── A2A Scratchpad Functions ───
    a2aPost(from, to, type, capability, payload, ttl) {
        if (!from || !to || !type) {
            this.terminal.print('a2aPost: from, to, and type are required', 'warning');
            return null;
        }
        const sp = this._getScratchpad();
        sp.seq = (sp.seq || 0) + 1;
        const msg = {
            id: `msg_${String(sp.seq).padStart(3, '0')}`,
            from: from,
            to: to,
            type: type,
            capability: capability || null,
            payload: payload || {},
            ttl: (typeof ttl === 'number' ? ttl : 300000),
            status: 'pending',
            ts: Date.now(),
            reply_to: null
        };
        sp.messages.push(msg);
        this._saveScratchpad(sp);
        return msg;
    }
    a2aPoll(agentId) {
        if (!agentId) return [];
        const sp = this._getScratchpad();
        const pending = [];
        for (const msg of sp.messages) {
            if (msg.to === agentId && msg.status === 'pending') {
                msg.status = 'delivered';
                pending.push(msg);
            }
        }
        if (pending.length > 0) this._saveScratchpad(sp);
        return pending;
    }
    a2aAck(messageId, resultPayload) {
        const sp = this._getScratchpad();
        const msg = sp.messages.find(m => m.id === messageId);
        if (!msg) {
            this.terminal.print(`a2aAck: message ${messageId} not found`, 'warning');
            return false;
        }
        if (msg.status === 'completed' || msg.status === 'failed') {
            this.terminal.print(`a2aAck: message ${messageId} already ${msg.status}`, 'warning');
            return false;
        }
        msg.status = 'completed';
        msg.result = resultPayload || {};
        msg.completedAt = Date.now();
        this._saveScratchpad(sp);
        return true;
    }
    a2aReject(messageId, error) {
        const sp = this._getScratchpad();
        const msg = sp.messages.find(m => m.id === messageId);
        if (!msg) {
            this.terminal.print(`a2aReject: message ${messageId} not found`, 'warning');
            return false;
        }
        if (msg.status === 'completed' || msg.status === 'failed') {
            this.terminal.print(`a2aReject: message ${messageId} already ${msg.status}`, 'warning');
            return false;
        }
        msg.status = 'failed';
        msg.error = error || 'unspecified error';
        msg.completedAt = Date.now();
        this._saveScratchpad(sp);
        return true;
    }
    a2aRegister(agentId, capabilities) {
        if (!agentId) return;
        const sp = this._getScratchpad();
        sp.agents[agentId] = {
            last_poll: Date.now(),
            capabilities: capabilities || []
        };
        this._saveScratchpad(sp);
    }
    a2aUnregister(agentId) {
        if (!agentId) return;
        const sp = this._getScratchpad();
        delete sp.agents[agentId];
        this._saveScratchpad(sp);
    }
    a2aPrune() {
        try {
            const sp = this._getScratchpad();
            const now = Date.now();
            const before = sp.messages.length;
            sp.messages = sp.messages.filter(m => {
                // Remove expired messages (past TTL)
                if (m.status === 'pending' && (now - m.ts > m.ttl)) return false;
                // Remove completed/failed messages older than 1 hour
                if ((m.status === 'completed' || m.status === 'failed') && m.completedAt && (now - m.completedAt > 3600000)) return false;
                return true;
            });
            const removed = before - sp.messages.length;
            if (removed > 0) this._saveScratchpad(sp);
            return removed;
        } catch (e) {
            console.warn('a2aPrune error:', e.message);
            return 0;
        }
    }
    a2aStatus() {
        const sp = this._getScratchpad();
        const counts = {};
        for (const msg of sp.messages) {
            if (!counts[msg.to]) counts[msg.to] = { pending: 0, delivered: 0, completed: 0, failed: 0 };
            if (msg.status === 'pending') counts[msg.to].pending++;
            else if (msg.status === 'delivered') counts[msg.to].delivered++;
            else if (msg.status === 'completed') counts[msg.to].completed++;
            else if (msg.status === 'failed') counts[msg.to].failed++;
        }
        this.terminal.print('📊 A2A Scratchpad Status:', 'header');
        this.terminal.print(`  Total messages: ${sp.messages.length}`, 'info');
        this.terminal.print(`  Registered agents: ${Object.keys(sp.agents).length}`, 'info');
        this.terminal.print(`  Sequence: ${sp.seq}`, 'info');
        const agentNames = Object.keys(counts);
        if (agentNames.length === 0) {
            this.terminal.print('  No messages in scratchpad', 'info');
            return;
        }
        for (const agentId of agentNames) {
            const c = counts[agentId];
            const total = c.pending + c.delivered + c.completed + c.failed;
            const caps = sp.agents[agentId] ? ` [${sp.agents[agentId].capabilities.join(', ')}]` : '';
            this.terminal.print(`  ${agentId}${caps}: ${total} msgs (⏳${c.pending} 📬${c.delivered} ✅${c.completed} ❌${c.failed})`, 'info');
        }
    }
    _a2aCleanup() {
        // Remove agent entries from scratchpad when agent directory is deleted from /agents/
        try {
            const sp = this._getScratchpad();
            const agentDirs = {};
            const dir = this.terminal.fs.readDir('/agents/');
            if (dir) {
                for (const entry of dir) {
                    if (entry.type === 'dir') agentDirs[entry.name] = true;
                }
            }
            let changed = false;
            for (const agentId of Object.keys(sp.agents)) {
                if (!agentDirs[agentId]) {
                    delete sp.agents[agentId];
                    changed = true;
                }
            }
            if (changed) this._saveScratchpad(sp);
        } catch (e) {
            console.warn('a2aCleanup error:', e.message);
        }
    }
    // ─── A2A Command Handlers ───
    a2aPostCommand(args) {
        // a2a-post <to> <type> <capability> <payload...>
        if (args.length < 3) {
            return this.terminal.print('Usage: a2a-post <to> <type> <capability> <payload...>', 'warning');
        }
        const to = args[0];
        const type = args[1];
        const capability = args[2];
        const payloadRaw = args.slice(3).join(' ');
        let payload = {};
        try {
            // Try parsing as JSON
            payload = JSON.parse(payloadRaw || '{}');
        } catch (e) {
            // Treat as plain text
            payload = { text: payloadRaw };
        }
        const from = 'user';
        const ttl = 300000;
        const msg = this.a2aPost(from, to, type, capability, payload, ttl);
        if (msg) {
            this.terminal.print(`📨 A2A message ${msg.id} posted to ${to} (type: ${type})`, 'success');
        }
    }
    a2aPollCommand(args) {
        // Use explicit agent ID if provided, otherwise try to determine current agent
        let agentId = (args && args[0]) || 'user';
        if (!args || !args[0]) {
            try {
                const orchestrator = this.terminal.moduleManager.modules['OrchestratorModule'];
                if (orchestrator && orchestrator._agents) {
                    const myAgents = Object.entries(orchestrator._agents).filter(([, a]) => a.status === 'busy');
                    if (myAgents.length > 0) agentId = myAgents[0][0];
                }
            } catch (e) {}
        }
        const msgs = this.a2aPoll(agentId);
        if (msgs.length === 0) {
            this.terminal.print(`📭 No pending messages for ${agentId}`, 'info');
            return;
        }
        this.terminal.print(`📬 ${msgs.length} message(s) for ${agentId}:`, 'header');
        for (const msg of msgs) {
            const capInfo = msg.capability ? ` [${msg.capability}]` : '';
            this.terminal.print(`  ${msg.id} from ${msg.from} (${msg.type}${capInfo})`, 'info');
            this.terminal.print(`    Payload: ${JSON.stringify(msg.payload).substring(0, 120)}`, 'text-muted');
        }
    }
    a2aAckCommand(args) {
        if (args.length < 1) {
            return this.terminal.print('Usage: a2a-ack <msgId> [result...]', 'warning');
        }
        const msgId = args[0];
        const resultRaw = args.slice(1).join(' ');
        let result = {};
        try {
            result = JSON.parse(resultRaw || '{}');
        } catch (e) {
            result = { text: resultRaw };
        }
        if (this.a2aAck(msgId, result)) {
            this.terminal.print(`✅ A2A message ${msgId} completed`, 'success');
        }
    }
    a2aRejectCommand(args) {
        if (args.length < 1) {
            return this.terminal.print('Usage: a2a-reject <msgId> [error...]', 'warning');
        }
        const msgId = args[0];
        const error = args.slice(1).join(' ') || 'rejected by user';
        if (this.a2aReject(msgId, error)) {
            this.terminal.print(`❌ A2A message ${msgId} rejected: ${error}`, 'warning');
        }
    }
    _loadContracts() {
        try {
            const data = this.terminal.fs.readFile('/.contracts/index.json');
            if (data) this._contracts = JSON.parse(data);
        } catch (e) {}
        // Try loading individual contract files
        const dir = this.terminal.fs.readDir('/.contracts/');
        if (dir) {
            dir.forEach(e => {
                if (e.type === 'file' && e.name.endsWith('.contract.json')) {
                    try {
                        const c = JSON.parse(this.terminal.fs.readFile('/.contracts/' + e.name));
                        this._contracts[c.role] = c;
                    } catch (e) { console.warn('Bad contract:', e.name, e.message); }
                }
            });
        }
    }
    _saveContracts() {
        try {
            this.terminal.fs.fsWriteJSON('/.contracts/index.json', this._contracts);
        } catch (e) { console.error('Contract save error:', e); }
    }
    registerAgent(rawArgs) {
        // MAINT-008: callers pass the command word first (['register', id, cap, cap…]), and the
        // old code took args[0] as the id and only args[1] as the capability list — so the boot
        // log read `Agent 'register' registered with 1 capabilities`. Strip the command word and
        // accept both `cap1,cap2` and `cap1 cap2 cap3`.
        const args = (rawArgs && rawArgs[0] === 'register') ? rawArgs.slice(1) : (rawArgs || []);
        const id = args[0] || `agent-${Date.now()}`;
        const capsArg = args.slice(1).join(',');
        const capabilities = capsArg
            ? capsArg.split(',').map(s => s.trim()).filter(Boolean)
            : ['list_files', 'read_file'];
        // MAINT-007/009: relative mkdir/rm resolved against the user's cwd, so a registration made
        // from /docs created /docs/agents/<id> and an unregister from anywhere else removed
        // nothing. Every path here is absolute.
        const agentDir = `/agents/${id}`;
        if (!this.terminal.fs.readDir(agentDir + '/')) {
            this.terminal.fs.mkdirRecursive(agentDir);
        }
        this.terminal.fs.writeFile(`${agentDir}/status.json`, JSON.stringify({
            id,
            status: 'idle',
            model: null,
            capabilities,
            registered: new Date().toISOString(),
            lastHeartbeat: new Date().toISOString(),
            contract: null
        }));
        // Auto-register in A2A scratchpad
        this.a2aRegister(id, capabilities);
        this.terminal.print(`✅ Agent '${id}' registered with ${capabilities.length} capabilities`, 'success');
    }
    registerContract(args) {
        const role = args[0];
        if (!role) return this.terminal.print('Usage: contract-register <role> [input_fields...] [--output output_fields...]', 'warning');

        const inputIdx = args.indexOf('--output');
        const hasOutputFlag = inputIdx !== -1;

        let inputFields = [], outputFields = [];
        if (hasOutputFlag) {
            inputFields = args.slice(1, inputIdx).filter(f => !f.startsWith('--'));
            outputFields = args.slice(inputIdx + 1).filter(f => !f.startsWith('--'));
        } else {
            inputFields = args.slice(1).filter(f => !f.startsWith('--'));
            outputFields = ['result']; // default output
        }

        const contract = {
            role,
            capabilities: inputFields,
            input_schema: inputFields,
            output_schema: outputFields,
            created: new Date().toISOString(),
            updated: new Date().toISOString()
        };
        this._contracts[role] = contract;
        // Save as individual contract file
        this.terminal.fs.fsWriteJSON(`/.contracts/${role}.contract.json`, contract);
        this._saveContracts();
        this.terminal.print(`✅ Contract registered for role '${role}'`, 'success');
        this.terminal.print(`   Input fields: ${inputFields.join(', ') || '(free-form)'}`, 'info');
        this.terminal.print(`   Output fields: ${outputFields.join(', ') || '(free-form)'}`, 'info');
    }
    listContracts() {
        const roles = Object.keys(this._contracts);
        if (roles.length === 0) return this.terminal.print('No contracts registered', 'info');
        this.terminal.print(`📜 A2A Contracts (${roles.length}):`, 'header');
        roles.forEach(r => {
            const c = this._contracts[r];
            this.terminal.print(`  ${r} — input:[${c.input_schema.join(',')}] → output:[${c.output_schema.join(',')}]`, 'info');
        });
    }
    validateTask(role, task) {
        const contract = this._contracts[role];
        if (!contract) return { valid: true, reason: 'no contract for role' }; // permissive fallback
        if (contract.input_schema.length === 0) return { valid: true, reason: 'free-form input' };
        // Simple validation: check required input fields are present in task
        const missing = contract.input_schema.filter(f => !task.toLowerCase().includes(f.toLowerCase()));
        if (missing.length > 0) {
            return { valid: false, reason: `missing required fields: ${missing.join(', ')}` };
        }
        return { valid: true, reason: 'matched' };
    }
    getContract(role) {
        return this._contracts[role] || null;
    }
    listAgents() {
        const agents = this.terminal.fs.ls('/agents/');
        if (!agents || agents.length === 0) {
            return this.terminal.print('No agents registered', 'info');
        }
        // MAINT-009: a directory alone is not a registration — anything without a readable
        // status.json is a leftover directory, not an agent. Listing them as agents made a
        // hand-made /agents/foo look like a live agent with unknown status.
        const registered = [], orphaned = [];
        agents.forEach(a => {
            if (a.type !== 'dir' || a.name === 'configured') return;
            let s = null;
            try {
                const data = this.terminal.fs.readFile(`/agents/${a.name}/status.json`);
                if (data) s = JSON.parse(data);
            } catch (e) { s = null; }
            if (s && s.id) registered.push({ name: a.name, s });
            else orphaned.push(a.name);
        });
        if (registered.length) {
            this.terminal.print(`📋 Registered Agents (${registered.length}):`, 'header');
            registered.forEach(({ name, s }) => {
                this.terminal.print(`  ${name} — ${s.status} (${(s.capabilities || []).length} capabilities)${s.contract ? ` → contract:${s.contract}` : ''}`, 'info');
            });
        } else {
            this.terminal.print('No agents registered', 'info');
        }
        if (orphaned.length) {
            this.terminal.print(`⚠️ ${orphaned.length} directory(ies) in /agents have no status.json (not registered): ${orphaned.join(', ')}`, 'warning');
        }
    }
    unregisterAgent(id) {
        // Unregister from A2A scratchpad
        this.a2aUnregister(id);
        // MAINT-007: absolute path — a relative rm resolved against the cwd and left the
        // directory behind whenever the user was not sitting in /.
        const ok = this.terminal.fs.rm('/agents/' + id);
        if (ok) this.terminal.print(`✅ Agent '${id}' unregistered`, 'success');
        else this.terminal.print(`❌ Agent '${id}' not found`, 'error');
    }
    showAgentStatus(id) {
        if (!id) return this.terminal.print('Usage: agent-status <agent-id>', 'error');
        const data = this.terminal.fs.readFile(`/agents/${id}/status.json`);
        if (!data) return this.terminal.print(`❌ Agent '${id}' not found`, 'error');
        const s = JSON.parse(data);
        this.terminal.print(`Agent: ${s.id}`, 'header');
        this.terminal.print(`  Status: ${s.status}`, 'info');
        this.terminal.print(`  Capabilities: ${(s.capabilities || []).join(', ')}`, 'info');
        this.terminal.print(`  Contract: ${s.contract || 'none'}`, 'info');
        this.terminal.print(`  Registered: ${s.registered}`, 'info');
        this.terminal.print(`  Last Heartbeat: ${s.lastHeartbeat}`, 'info');
    }
    getAgent(id) {
        const data = this.terminal.fs.readFile(`/agents/${id}/status.json`);
        return data ? JSON.parse(data) : null;
    }
    updateHeartbeat(id) {
        const agent = this.getAgent(id);
        if (!agent) return false;
        agent.lastHeartbeat = new Date().toISOString();
        this.terminal.fs.writeFile(`agents/${id}/status.json`, JSON.stringify(agent));
        return true;
    }
}