import { Elysia, t } from 'elysia';
import { db } from '../db';
import { events, clients } from '../db/schema';
import { eq, and, gte, lte, sql } from 'drizzle-orm';
import type { User } from '../lib/auth';

export const eventRoutes = new Elysia({ prefix: '/events' })
  // List events with optional filters
  .get('/', async ({ query, user }: {
    query: { 
      clientId?: string;
      type?: string;
      upcoming?: string; // days ahead
    };
    user: User;
  }) => {
    let conditions = [eq(events.userId, user.id)];
    
    if (query.clientId) {
      conditions.push(eq(events.clientId, query.clientId));
    }
    
    if (query.type) {
      conditions.push(eq(events.type, query.type));
    }
    
    let results = await db.select({
      event: events,
      client: {
        id: clients.id,
        firstName: clients.firstName,
        lastName: clients.lastName,
      },
    })
      .from(events)
      .innerJoin(clients, eq(events.clientId, clients.id))
      .where(and(...conditions))
      .orderBy(events.date);
    
    // Filter upcoming events if requested
    if (query.upcoming) {
      const daysAhead = parseInt(query.upcoming) || 7;
      const now = new Date();
      const future = new Date();
      future.setDate(future.getDate() + daysAhead);
      
      results = results.filter(r => {
        const eventDate = new Date(r.event.date);
        // For recurring events, check if the month/day falls within range
        if (r.event.recurring) {
          const thisYear = new Date(
            now.getFullYear(),
            eventDate.getMonth(),
            eventDate.getDate()
          );
          const nextYear = new Date(
            now.getFullYear() + 1,
            eventDate.getMonth(),
            eventDate.getDate()
          );
          return (thisYear >= now && thisYear <= future) || 
                 (nextYear >= now && nextYear <= future);
        }
        return eventDate >= now && eventDate <= future;
      });
    }
    
    return results;
  }, {
    query: t.Object({
      clientId: t.Optional(t.String({ format: 'uuid' })),
      type: t.Optional(t.String()),
      upcoming: t.Optional(t.String()),
    }),
  })
  
  // Get single event
  .get('/:id', async ({ params, user }: { params: { id: string }; user: User }) => {
    const [event] = await db.select({
      event: events,
      client: {
        id: clients.id,
        firstName: clients.firstName,
        lastName: clients.lastName,
      },
    })
      .from(events)
      .innerJoin(clients, eq(events.clientId, clients.id))
      .where(and(eq(events.id, params.id), eq(events.userId, user.id)))
      .limit(1);
    
    if (!event) {
      throw new Error('Event not found');
    }
    
    return event;
  }, {
    params: t.Object({
      id: t.String({ format: 'uuid' }),
    }),
  })
  
  // Create event
  .post('/', async ({ body, user }: {
    body: {
      clientId: string;
      type: string;
      title: string;
      date: string;
      recurring?: boolean;
      reminderDays?: number;
    };
    user: User;
  }) => {
    // Verify client belongs to user
    const [client] = await db.select()
      .from(clients)
      .where(and(eq(clients.id, body.clientId), eq(clients.userId, user.id)))
      .limit(1);
    
    if (!client) {
      throw new Error('Client not found');
    }
    
    const [event] = await db.insert(events)
      .values({
        userId: user.id,
        clientId: body.clientId,
        type: body.type,
        title: body.title,
        date: new Date(body.date),
        recurring: body.recurring ?? false,
        reminderDays: body.reminderDays ?? 7,
      })
      .returning();
    
    return event;
  }, {
    body: t.Object({
      clientId: t.String({ format: 'uuid' }),
      type: t.String({ minLength: 1 }),
      title: t.String({ minLength: 1 }),
      date: t.String(), // ISO date
      recurring: t.Optional(t.Boolean()),
      reminderDays: t.Optional(t.Number({ minimum: 0 })),
    }),
  })
  
  // Update event
  .put('/:id', async ({ params, body, user }: {
    params: { id: string };
    body: {
      type?: string;
      title?: string;
      date?: string;
      recurring?: boolean;
      reminderDays?: number;
    };
    user: User;
  }) => {
    const updateData: Record<string, unknown> = {};
    
    if (body.type !== undefined) updateData.type = body.type;
    if (body.title !== undefined) updateData.title = body.title;
    if (body.date !== undefined) updateData.date = new Date(body.date);
    if (body.recurring !== undefined) updateData.recurring = body.recurring;
    if (body.reminderDays !== undefined) updateData.reminderDays = body.reminderDays;
    
    const [event] = await db.update(events)
      .set(updateData)
      .where(and(eq(events.id, params.id), eq(events.userId, user.id)))
      .returning();
    
    if (!event) {
      throw new Error('Event not found');
    }
    
    return event;
  }, {
    params: t.Object({
      id: t.String({ format: 'uuid' }),
    }),
    body: t.Object({
      type: t.Optional(t.String()),
      title: t.Optional(t.String()),
      date: t.Optional(t.String()),
      recurring: t.Optional(t.Boolean()),
      reminderDays: t.Optional(t.Number()),
    }),
  })
  
  // Delete event
  .delete('/:id', async ({ params, user }: { params: { id: string }; user: User }) => {
    const [deleted] = await db.delete(events)
      .where(and(eq(events.id, params.id), eq(events.userId, user.id)))
      .returning({ id: events.id });
    
    if (!deleted) {
      throw new Error('Event not found');
    }
    
    return { success: true, id: deleted.id };
  }, {
    params: t.Object({
      id: t.String({ format: 'uuid' }),
    }),
  })
  
  // Sync ALL events from all clients' birthdays/anniversaries
  .post('/sync-all', async ({ user }: { user: User }) => {
    // Get all clients for this user
    const userClients = await db.select()
      .from(clients)
      .where(eq(clients.userId, user.id));
    
    let created = 0;
    let updated = 0;
    
    for (const client of userClients) {
      // Sync birthday
      if (client.birthday) {
        const [existing] = await db.select()
          .from(events)
          .where(and(eq(events.clientId, client.id), eq(events.type, 'birthday')))
          .limit(1);
        
        if (!existing) {
          await db.insert(events).values({
            userId: user.id,
            clientId: client.id,
            type: 'birthday',
            title: `${client.firstName}'s Birthday`,
            date: client.birthday,
            recurring: true,
            reminderDays: 7,
          });
          created++;
        } else {
          await db.update(events)
            .set({ date: client.birthday, title: `${client.firstName}'s Birthday` })
            .where(eq(events.id, existing.id));
          updated++;
        }
      }
      
      // Sync anniversary
      if (client.anniversary) {
        const [existing] = await db.select()
          .from(events)
          .where(and(eq(events.clientId, client.id), eq(events.type, 'anniversary')))
          .limit(1);
        
        if (!existing) {
          await db.insert(events).values({
            userId: user.id,
            clientId: client.id,
            type: 'anniversary',
            title: `${client.firstName}'s Anniversary`,
            date: client.anniversary,
            recurring: true,
            reminderDays: 7,
          });
          created++;
        } else {
          await db.update(events)
            .set({ date: client.anniversary, title: `${client.firstName}'s Anniversary` })
            .where(eq(events.id, existing.id));
          updated++;
        }
      }
    }
    
    return { success: true, created, updated, clientsProcessed: userClients.length };
  })
  
  // Sync events from client birthdays/anniversaries
  .post('/sync/:clientId', async ({ params, user }: { params: { clientId: string }; user: User }) => {
    // Get client
    const [client] = await db.select()
      .from(clients)
      .where(and(eq(clients.id, params.clientId), eq(clients.userId, user.id)))
      .limit(1);
    
    if (!client) {
      throw new Error('Client not found');
    }
    
    const created = [];
    
    // Create birthday event if client has birthday
    if (client.birthday) {
      // Check if birthday event already exists
      const [existing] = await db.select()
        .from(events)
        .where(and(
          eq(events.clientId, client.id),
          eq(events.type, 'birthday')
        ))
        .limit(1);
      
      if (!existing) {
        const [event] = await db.insert(events)
          .values({
            userId: user.id,
            clientId: client.id,
            type: 'birthday',
            title: `${client.firstName}'s Birthday`,
            date: client.birthday,
            recurring: true,
            reminderDays: 7,
          })
          .returning();
        created.push(event);
      }
    }
    
    // Create anniversary event if client has anniversary
    if (client.anniversary) {
      const [existing] = await db.select()
        .from(events)
        .where(and(
          eq(events.clientId, client.id),
          eq(events.type, 'anniversary')
        ))
        .limit(1);
      
      if (!existing) {
        const [event] = await db.insert(events)
          .values({
            userId: user.id,
            clientId: client.id,
            type: 'anniversary',
            title: `${client.firstName}'s Anniversary`,
            date: client.anniversary,
            recurring: true,
            reminderDays: 7,
          })
          .returning();
        created.push(event);
      }
    }
    
    return { created };
  }, {
    params: t.Object({
      clientId: t.String({ format: 'uuid' }),
    }),
  });