// Claude Desktop — Event-Bridge
// Empfängt Events vom Tauri-Backend und aktualisiert die Stores

import { listen, type UnlistenFn } from '@tauri-apps/api/event';
import { invoke } from '@tauri-apps/api/core';
import { get } from 'svelte/store';
import {
	agents,
	toolCalls,
	messages,
	isProcessing,
	addMessage,
	addAgent,
	addSubAgent,
	updateAgentStatus,
	addToolCall,
	completeToolCall,
	currentModel,
	sessionStats,
	contextUsage,
	currentSessionId,
	messageToDb,
	addMonitorEvent,
	loadMonitorEventsFromDb,
	activeKnowledgeHints,
	agentMode,
	type Message,
	type Agent,
	type MonitorEventType,
	type KnowledgeHint,
	type AgentMode
} from './app';

// Event-Typen vom Backend
interface AgentEvent {
	id: string;
	type?: string;
	task?: string;
	code?: number;
	model?: string;
}

interface SubagentEvent {
	id: string;
	parentAgentId: string;
	type?: string;
	task?: string;
	depth?: number;
	model?: string;
	toolUseId?: string;
	success?: boolean;
}

interface ToolEvent {
	id: string;
	tool?: string;
	input?: Record<string, unknown>;
	output?: string;
	success?: boolean;
}

interface TextEvent {
	text: string;
}

interface ResultEvent {
	cost?: number;
	tokens?: {
		input: number;
		output: number;
	};
	session_id?: string;
	model?: string;
	text?: string;
}

interface MonitorEventPayload {
	type: MonitorEventType;
	summary: string;
	details: Record<string, unknown>;
	agentId?: string;
	durationMs?: number;
	error?: string;
}

// Listener-Handles
let listeners: UnlistenFn[] = [];

// Streaming: ID der aktuellen Live-Nachricht
let streamingMessageId: string | null = null;

// Nachricht in DB speichern
async function saveMessageToDb(msg: Message) {
	const sessionId = get(currentSessionId);
	if (!sessionId) return;

	try {
		const dbMsg = messageToDb(msg, sessionId);
		await invoke('save_message', { message: dbMsg });
		console.log('💾 Nachricht gespeichert:', msg.role);
	} catch (err) {
		console.error('Fehler beim Speichern der Nachricht:', err);
	}
}

// Events initialisieren
export async function initEventListeners(): Promise<void> {
	console.log('🎧 Initialisiere Event-Listener...');
	await cleanupEventListeners();

	// Monitor-Events aus DB laden (letzte Session)
	await loadMonitorEventsFromDb(500);

	// Bridge bereit
	listeners.push(
		await listen('bridge-ready', () => {
			console.log('✅ Bridge bereit');
		})
	);

	// Agent gestartet
	listeners.push(
		await listen<AgentEvent>('agent-started', (event) => {
			const { id, type, task, model } = event.payload;
			console.log('🤖 Agent gestartet:', id, type);

			// WICHTIG: id mitgeben, sonst stimmt parentAgentId der Sub-Agents nicht!
			addAgent(mapAgentType(type || 'main'), task || 'Verarbeite...', { id, model });
			isProcessing.set(true);

			// Leere Streaming-Nachricht anlegen
			streamingMessageId = crypto.randomUUID();
			messages.update((msgs) => [
				...msgs,
				{
					id: streamingMessageId!,
					role: 'assistant',
					content: '',
					timestamp: new Date(),
					agentId: id
				}
			]);
		})
	);

	// Agent gestoppt
	listeners.push(
		await listen<AgentEvent>('agent-stopped', (event) => {
			const { id } = event.payload;
			console.log('⏹️ Agent gestoppt:', id);
			updateAgentStatus(id, 'stopped');
			streamingMessageId = null;

			// Prüfen ob noch Agents aktiv
			agents.update((ags) => {
				const stillActive = ags.some((a) => a.status === 'active');
				if (!stillActive) {
					isProcessing.set(false);
				}
				return ags;
			});
		})
	);

	// Alle Agents gestoppt
	listeners.push(
		await listen('all-stopped', () => {
			console.log('⏹️ Alle Agents gestoppt');
			agents.update((ags) => ags.map((a) => ({ ...a, status: 'stopped' as const })));
			isProcessing.set(false);
			streamingMessageId = null;
		})
	);

	// Subagent gestartet
	listeners.push(
		await listen<SubagentEvent>('subagent-started', (event) => {
			const { id, parentAgentId, type, task, depth, model } = event.payload;
			console.log('🤖 Subagent gestartet:', id, type, '(Parent:', parentAgentId, ')');

			addSubAgent(
				parentAgentId,
				mapAgentType(type || 'explore'),
				task || 'Subagent-Aufgabe',
				{ id, model }
			);
		})
	);

	// Subagent gestoppt
	listeners.push(
		await listen<SubagentEvent>('subagent-stopped', (event) => {
			const { id, success } = event.payload;
			console.log('⏹️ Subagent gestoppt:', id, success ? 'OK' : 'FEHLER');
			updateAgentStatus(id, 'stopped');
		})
	);

	// Tool Start
	listeners.push(
		await listen<ToolEvent>('tool-start', async (event) => {
			const { tool, input } = event.payload;
			console.log('🔧 Tool Start:', tool);

			agents.update((ags) => {
				const activeAgent = ags.find((a) => a.status === 'active');
				if (activeAgent) {
					addToolCall(activeAgent.id, tool || 'unknown', input || {});
				}
				return ags;
			});

			// Wissens-Hints aus claude-db laden
			try {
				// Command aus Input extrahieren (je nach Tool)
				let command: string | undefined;
				if (input && typeof input === 'object') {
					// Bash: command, Read/Write/Edit: file_path
					command = (input as Record<string, unknown>).command as string
						|| (input as Record<string, unknown>).file_path as string
						|| undefined;
				}

				const hints = await invoke<KnowledgeHint[]>('get_tool_hints', {
					tool: tool || 'unknown',
					command,
					context: undefined
				});

				if (hints && hints.length > 0) {
					activeKnowledgeHints.set(hints);
					console.log('💡 Wissens-Hints geladen:', hints.map(h => h.title));
				}
			} catch (err) {
				// Fehler beim Laden ignorieren — Hints sind optional
				console.debug('Wissens-Hints nicht verfügbar:', err);
			}
		})
	);

	// Tool Ende
	listeners.push(
		await listen<ToolEvent>('tool-end', (event) => {
			const { id, success, output } = event.payload;
			console.log('✅ Tool Ende:', id, success ? 'OK' : 'FEHLER');
			completeToolCall(id, output, !success);
		})
	);

	// Text-Streaming — live in die aktuelle Nachricht schreiben
	listeners.push(
		await listen<TextEvent>('claude-text', (event) => {
			const { text } = event.payload;
			if (streamingMessageId) {
				messages.update((msgs) =>
					msgs.map((m) =>
						m.id === streamingMessageId
							? { ...m, content: m.content + text }
							: m
					)
				);
			}
		})
	);

	// Ergebnis (Kosten, Token, Modell)
	listeners.push(
		await listen<ResultEvent>('claude-result', async (event) => {
			const { cost, tokens, session_id, model, text } = event.payload;
			console.log('📊 Ergebnis:', { cost: cost ? `$${cost.toFixed(4)}` : '-', tokens, model, session_id });

			// Modell an die Streaming-Nachricht anhängen und speichern
			if (streamingMessageId) {
				let finalMessage: Message | null = null;

				messages.update((msgs) => {
					return msgs.map((m) => {
						if (m.id === streamingMessageId) {
							// Fallback: wenn kein Streaming-Text kam, result.text nutzen
							const content = m.content && m.content.trim() ? m.content : (text || '');
							finalMessage = { ...m, content, model: model || m.model };
							return finalMessage;
						}
						return m;
					});
				});

				// Nachricht in DB speichern (nur wenn Content vorhanden)
				if (finalMessage && finalMessage.content && finalMessage.content.trim()) {
					await saveMessageToDb(finalMessage);
				}
			}

			if (model) {
				currentModel.set(model);
			}

			// Claude Session-ID speichern für Fortsetzung
			if (session_id) {
				const appSessionId = get(currentSessionId);
				if (appSessionId) {
					try {
						await invoke('set_claude_session_id', {
							sessionId: appSessionId,
							claudeSessionId: session_id,
						});
						console.log('🔗 Claude Session-ID gespeichert:', session_id);
					} catch (err) {
						console.warn('Claude Session-ID konnte nicht gespeichert werden:', err);
					}
				}
			}

			// Session-Statistiken aktualisieren
			if (tokens || cost) {
				sessionStats.update((s) => ({
					totalTokensIn: s.totalTokensIn + (tokens?.input || 0),
					totalTokensOut: s.totalTokensOut + (tokens?.output || 0),
					totalCost: s.totalCost + (cost || 0),
					messageCount: s.messageCount + 1,
				}));

				// Kontext-Auslastung aktualisieren (input_tokens = aktuelle Kontext-Größe)
				if (tokens?.input) {
					contextUsage.update((ctx) => ({
						...ctx,
						inputTokens: tokens.input,
						outputTokens: tokens.output || 0,
					}));
				}
			}
		})
	);

	// STOPP-Signal — nur Agents stoppen, Messages/Session bleiben erhalten
	listeners.push(
		await listen('agents-stopped', () => {
			console.log('🛑 STOPP-Signal empfangen');
			streamingMessageId = null;
			// Alle Agents auf "stopped" setzen, aber Messages NICHT löschen
			agents.update((ags) => ags.map((a) => ({ ...a, status: 'stopped' as const })));
			toolCalls.set([]);
			isProcessing.set(false);
		})
	);

	// Agent-Modus geändert (von Bridge bestätigt)
	listeners.push(
		await listen<{ mode: AgentMode }>('mode-changed', (event) => {
			const { mode } = event.payload;
			console.log('🔄 Agent-Modus geändert:', mode);
			agentMode.set(mode);
		})
	);

	// Monitor-Events — für System-Monitor Panel
	listeners.push(
		await listen<MonitorEventPayload>('monitor', (event) => {
			const { type, summary, details, agentId, durationMs, error } = event.payload;

			addMonitorEvent(type, summary, details, {
				agentId,
				durationMs,
				error,
			});
		})
	);

	console.log('✅ Event-Listener initialisiert');
}

// Listener aufräumen
export async function cleanupEventListeners(): Promise<void> {
	for (const unlisten of listeners) {
		unlisten();
	}
	listeners = [];
}

// Agent-Typ mappen
function mapAgentType(type: string): Agent['type'] {
	const typeMap: Record<string, Agent['type']> = {
		main: 'main',
		'Main Agent': 'main',
		Main: 'main',
		explore: 'explore',
		Explore: 'explore',
		'general-purpose': 'explore',
		plan: 'plan',
		Plan: 'plan',
		bash: 'bash',
		Bash: 'bash',
		code: 'code',
		Code: 'code',
		implement: 'code',
		test: 'test',
		Test: 'test',
		review: 'review',
		Review: 'review',
	};
	return typeMap[type] || 'explore';
}