import { eq, sql, desc, and, ilike, or, inArray } from 'drizzle-orm';
import { db, schema } from '../db/index.js';
import { authenticate } from '../middleware/auth.js';

export default async function workshopRoutes(fastify) {

  // Browse patches (public)
  fastify.get('/', async (request) => {
    const { q, tags, sort = 'recent', page = 1 } = request.query;
    const limit = 20;
    const offset = (page - 1) * limit;

    const conditions = [eq(schema.sharedPatches.isDeleted, false)];

    if (q) {
      conditions.push(
        or(
          ilike(schema.sharedPatches.title, `%${q}%`),
          ilike(schema.sharedPatches.description, `%${q}%`)
        )
      );
    }

    if (tags) {
      const tagList = tags.split(',').map(t => t.trim());
      conditions.push(sql`${schema.sharedPatches.tags} && ARRAY[${sql.join(tagList.map(t => sql`${t}`), sql`, `)}]::text[]`);
    }

    const orderBy = sort === 'popular'
      ? desc(schema.sharedPatches.likesCount)
      : desc(schema.sharedPatches.createdAt);

    const patches = await db.select({
      id: schema.sharedPatches.id,
      title: schema.sharedPatches.title,
      description: schema.sharedPatches.description,
      tags: schema.sharedPatches.tags,
      data: schema.sharedPatches.data,
      likesCount: schema.sharedPatches.likesCount,
      createdAt: schema.sharedPatches.createdAt,
      userId: schema.sharedPatches.userId,
    }).from(schema.sharedPatches)
      .where(and(...conditions))
      .orderBy(orderBy)
      .limit(limit)
      .offset(offset);

    // Get usernames for patches
    const userIds = [...new Set(patches.filter(p => p.userId).map(p => p.userId))];
    let userMap = {};
    if (userIds.length > 0) {
      const users = await db.select({
        id: schema.users.id,
        username: schema.users.username,
        avatarUrl: schema.users.avatarUrl,
      }).from(schema.users).where(inArray(schema.users.id, userIds));
      userMap = Object.fromEntries(users.map(u => [u.id, u]));
    }

    const result = patches.map(p => ({
      ...p,
      author: userMap[p.userId] || null,
      userId: undefined,
    }));

    return { patches: result, page: +page, limit };
  });

  // Get single patch
  fastify.get('/:id', async (request, reply) => {
    const [patch] = await db.select().from(schema.sharedPatches)
      .where(and(
        eq(schema.sharedPatches.id, request.params.id),
        eq(schema.sharedPatches.isDeleted, false)
      )).limit(1);

    if (!patch) return reply.code(404).send({ error: 'Not found' });

    let author = null;
    if (patch.userId) {
      const [user] = await db.select({
        username: schema.users.username,
        avatarUrl: schema.users.avatarUrl,
      }).from(schema.users).where(eq(schema.users.id, patch.userId)).limit(1);
      author = user || null;
    }

    return { ...patch, author };
  });

  // Share a patch (requires auth)
  fastify.post('/', { preHandler: [authenticate] }, async (request) => {
    const { title, description, tags, data } = request.body;
    if (!title || !data) return { error: 'title and data required' };

    const [patch] = await db.insert(schema.sharedPatches).values({
      userId: request.user.id,
      title,
      description: description || '',
      tags: tags || [],
      data,
    }).returning();

    return patch;
  });

  // Delete own patch
  fastify.delete('/:id', { preHandler: [authenticate] }, async (request, reply) => {
    const [patch] = await db.select().from(schema.sharedPatches)
      .where(eq(schema.sharedPatches.id, request.params.id)).limit(1);

    if (!patch) return reply.code(404).send({ error: 'Not found' });

    // Owner or admin can delete
    if (patch.userId !== request.user.id && request.user.role !== 'admin') {
      return reply.code(403).send({ error: 'Forbidden' });
    }

    await db.update(schema.sharedPatches)
      .set({ isDeleted: true })
      .where(eq(schema.sharedPatches.id, request.params.id));

    return { ok: true };
  });

  // Like a patch
  fastify.post('/:id/like', { preHandler: [authenticate] }, async (request, reply) => {
    const patchId = request.params.id;

    // Check if already liked
    const [existing] = await db.select().from(schema.likes)
      .where(and(
        eq(schema.likes.userId, request.user.id),
        eq(schema.likes.patchId, patchId)
      )).limit(1);

    if (existing) return { liked: true, message: 'Already liked' };

    await db.insert(schema.likes).values({
      userId: request.user.id,
      patchId,
    });

    await db.update(schema.sharedPatches)
      .set({ likesCount: sql`${schema.sharedPatches.likesCount} + 1` })
      .where(eq(schema.sharedPatches.id, patchId));

    return { liked: true };
  });

  // Unlike a patch
  fastify.delete('/:id/like', { preHandler: [authenticate] }, async (request) => {
    const patchId = request.params.id;

    const result = await db.delete(schema.likes)
      .where(and(
        eq(schema.likes.userId, request.user.id),
        eq(schema.likes.patchId, patchId)
      ));

    await db.update(schema.sharedPatches)
      .set({ likesCount: sql`GREATEST(${schema.sharedPatches.likesCount} - 1, 0)` })
      .where(eq(schema.sharedPatches.id, patchId));

    return { liked: false };
  });

  // Report/flag a patch
  fastify.post('/:id/report', { preHandler: [authenticate] }, async (request) => {
    await db.update(schema.sharedPatches)
      .set({ isFlagged: true })
      .where(eq(schema.sharedPatches.id, request.params.id));
    return { ok: true };
  });
}