import { EventBus } from '../core/EventBus';
import { IEventBus, CalendarEvent } from '../types/CalendarTypes';
import { EventTypes } from '../constants/EventTypes';

/**
 * EventManager - Administrerer event lifecycle og CRUD operationer
 * Håndterer mock data og event synchronization
 */
export class EventManager {
    private eventBus: IEventBus;
    private events: CalendarEvent[] = [];

    constructor(eventBus: IEventBus) {
        this.eventBus = eventBus;
        this.setupEventListeners();
        this.loadMockData();
    }

    private setupEventListeners(): void {
        this.eventBus.on(EventTypes.CALENDAR_INITIALIZED, () => {
            this.syncEvents();
        });

        this.eventBus.on(EventTypes.DATE_CHANGED, () => {
            this.syncEvents();
        });

        this.eventBus.on(EventTypes.VIEW_RENDERED, () => {
            this.syncEvents();
        });
    }

    private loadMockData(): void {
        // Mock events baseret på POC data med korrekt CalendarEvent struktur
        this.events = [
            {
                id: '1',
                title: 'Team Standup',
                start: '2024-01-15T09:00:00',
                end: '2024-01-15T09:30:00',
                type: 'meeting',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 30 }
            },
            {
                id: '2',
                title: 'Client Meeting',
                start: '2024-01-15T14:00:00',
                end: '2024-01-15T15:30:00',
                type: 'meeting',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 90 }
            },
            {
                id: '3',
                title: 'Lunch',
                start: '2024-01-15T12:00:00',
                end: '2024-01-15T13:00:00',
                type: 'meal',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 60 }
            },
            {
                id: '4',
                title: 'Deep Work Session',
                start: '2024-01-16T10:00:00',
                end: '2024-01-16T12:00:00',
                type: 'work',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 120 }
            },
            {
                id: '5',
                title: 'Team Standup',
                start: '2024-01-16T09:00:00',
                end: '2024-01-16T09:30:00',
                type: 'meeting',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 30 }
            },
            {
                id: '6',
                title: 'Lunch',
                start: '2024-01-16T12:30:00',
                end: '2024-01-16T13:30:00',
                type: 'meal',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 60 }
            },
            {
                id: '7',
                title: 'Project Review',
                start: '2024-01-17T15:00:00',
                end: '2024-01-17T16:00:00',
                type: 'meeting',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 60 }
            },
            {
                id: '8',
                title: 'Lunch',
                start: '2024-01-17T12:00:00',
                end: '2024-01-17T13:00:00',
                type: 'meal',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 60 }
            },
            {
                id: '9',
                title: 'Sprint Planning',
                start: '2024-01-18T10:00:00',
                end: '2024-01-18T12:00:00',
                type: 'meeting',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 120 }
            },
            {
                id: '10',
                title: 'Coffee Break',
                start: '2024-01-18T15:00:00',
                end: '2024-01-18T15:30:00',
                type: 'meal',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 30 }
            },
            {
                id: '11',
                title: 'Documentation',
                start: '2024-01-19T13:00:00',
                end: '2024-01-19T16:00:00',
                type: 'work',
                allDay: false,
                syncStatus: 'synced',
                metadata: { duration: 180 }
            }
        ];

        console.log(`EventManager: Loaded ${this.events.length} mock events`);
    }

    private syncEvents(): void {
        // Emit events for rendering
        this.eventBus.emit(EventTypes.EVENTS_LOADED, {
            events: this.events
        });

        console.log(`EventManager: Synced ${this.events.length} events`);
    }

    public getEvents(): CalendarEvent[] {
        return [...this.events];
    }


    public getEventById(id: string): CalendarEvent | undefined {
        return this.events.find(event => event.id === id);
    }

    public addEvent(event: Omit<CalendarEvent, 'id'>): CalendarEvent {
        const newEvent: CalendarEvent = {
            ...event,
            id: Date.now().toString()
        };
        
        this.events.push(newEvent);
        this.syncEvents();
        
        this.eventBus.emit(EventTypes.EVENT_CREATED, {
            event: newEvent
        });

        return newEvent;
    }

    public updateEvent(id: string, updates: Partial<CalendarEvent>): CalendarEvent | null {
        const eventIndex = this.events.findIndex(event => event.id === id);
        if (eventIndex === -1) return null;

        const updatedEvent = { ...this.events[eventIndex], ...updates };
        this.events[eventIndex] = updatedEvent;
        
        this.syncEvents();
        
        this.eventBus.emit(EventTypes.EVENT_UPDATED, {
            event: updatedEvent
        });

        return updatedEvent;
    }

    public deleteEvent(id: string): boolean {
        const eventIndex = this.events.findIndex(event => event.id === id);
        if (eventIndex === -1) return false;

        const deletedEvent = this.events[eventIndex];
        this.events.splice(eventIndex, 1);
        
        this.syncEvents();
        
        this.eventBus.emit(EventTypes.EVENT_DELETED, {
            event: deletedEvent
        });

        return true;
    }

    public refresh(): void {
        this.syncEvents();
    }

    public destroy(): void {
        this.events = [];
    }
}