import Router from 'koa-router';
import httpErrors from 'http-errors';
import { lock } from '../redis';
import isUUID from 'validator/lib/isUUID';

const URL_REGEX = /^[a-zA-Z0-9-]*-([a-zA-Z0-9]{10,15})$/;

import auth from './middlewares/authentication';
// import pagination from './middlewares/pagination';
import { presentDocument } from '../presenters';
import { Document, Collection } from '../models';

const router = new Router();

const getDocumentForId = async id => {
  try {
    let document;
    if (isUUID(id)) {
      document = await Document.findOne({
        where: {
          id,
        },
      });
    } else if (id.match(URL_REGEX)) {
      document = await Document.findOne({
        where: {
          urlId: id.match(URL_REGEX)[1],
        },
      });
    } else {
      throw httpErrors.NotFound();
    }
    return document;
  } catch (e) {
    // Invalid UUID
    throw httpErrors.NotFound();
  }
};

// FIXME: This really needs specs :/
router.post('documents.info', auth(), async ctx => {
  const { id } = ctx.body;
  ctx.assertPresent(id, 'id is required');
  const document = await getDocumentForId(id);

  if (!document) throw httpErrors.NotFound();

  // Don't expose private documents outside the team
  if (document.private) {
    if (!ctx.state.user) throw httpErrors.NotFound();

    const user = await ctx.state.user;
    if (document.teamId !== user.teamId) {
      throw httpErrors.NotFound();
    }

    ctx.body = {
      data: await presentDocument(ctx, document, {
        includeCollection: true,
        includeCollaborators: true,
      }),
    };
  } else {
    ctx.body = {
      data: await presentDocument(ctx, document, {
        includeCollaborators: true,
      }),
    };
  }
});

router.post('documents.search', auth(), async ctx => {
  const { query } = ctx.body;
  ctx.assertPresent(query, 'query is required');

  const user = await ctx.state.user;

  const documents = await Document.searchForUser(user, query);

  const data = [];
  await Promise.all(
    documents.map(async document => {
      data.push(
        await presentDocument(ctx, document, {
          includeCollection: true,
          includeCollaborators: true,
        })
      );
    })
  );

  ctx.body = {
    pagination: ctx.state.pagination,
    data,
  };
});

router.post('documents.create', auth(), async ctx => {
  const { collection, title, text, parentDocument } = ctx.body;
  ctx.assertPresent(collection, 'collection is required');
  ctx.assertPresent(title, 'title is required');
  ctx.assertPresent(text, 'text is required');

  const user = ctx.state.user;
  const ownerCollection = await Collection.findOne({
    where: {
      id: collection,
      teamId: user.teamId,
    },
  });

  if (!ownerCollection) throw httpErrors.BadRequest();

  const document = await (() => {
    return new Promise(resolve => {
      lock(ownerCollection.id, 10000, async done => {
        // FIXME: should we validate the existance of parentDocument?
        let parentDocumentObj = {};
        if (parentDocument && ownerCollection.type === 'atlas') {
          parentDocumentObj = await Document.findOne({
            where: {
              id: parentDocument,
              atlasId: ownerCollection.id,
            },
          });
        }

        const newDocument = await Document.create({
          parentDocumentId: parentDocumentObj.id,
          atlasId: ownerCollection.id,
          teamId: user.teamId,
          userId: user.id,
          lastModifiedById: user.id,
          createdById: user.id,
          title,
          text,
        });

        // TODO: Move to afterSave hook if possible with imports
        if (parentDocument && ownerCollection.type === 'atlas') {
          await ownerCollection.reload();
          ownerCollection.addNodeToNavigationTree(newDocument);
          await ownerCollection.save();
        }

        done(resolve(newDocument));
      });
    });
  })();

  ctx.body = {
    data: await presentDocument(ctx, document, {
      includeCollection: true,
      includeCollaborators: true,
    }),
  };
});

router.post('documents.update', auth(), async ctx => {
  const { id, title, text } = ctx.body;
  ctx.assertPresent(id, 'id is required');
  ctx.assertPresent(title, 'title is required');
  ctx.assertPresent(text, 'text is required');

  const user = ctx.state.user;
  const document = await getDocumentForId(id);

  if (!document || document.teamId !== user.teamId)
    throw httpErrors.BadRequest();

  // Update document
  document.title = title;
  document.text = text;
  document.lastModifiedById = user.id;
  await document.save();

  // Update
  // TODO: Add locking
  const collection = await Collection.findById(document.atlasId);
  if (collection.type === 'atlas') {
    await collection.updateNavigationTree();
  }

  ctx.body = {
    data: await presentDocument(ctx, document, {
      includeCollection: true,
      includeCollaborators: true,
    }),
  };
});

router.post('documents.delete', auth(), async ctx => {
  const { id } = ctx.body;
  ctx.assertPresent(id, 'id is required');

  const user = ctx.state.user;
  const document = await getDocumentForId(id);
  const collection = await Collection.findById(document.atlasId);

  if (!document || document.teamId !== user.teamId)
    throw httpErrors.BadRequest();

  // TODO: Add locking
  if (collection.type === 'atlas') {
    // Don't allow deletion of root docs
    if (!document.parentDocumentId) {
      throw httpErrors.BadRequest("Unable to delete atlas's root document");
    }

    // Delete all chilren
    try {
      await collection.deleteDocument(document);
      await collection.save();
    } catch (e) {
      throw httpErrors.BadRequest('Error while deleting');
    }
  }

  // Delete the actual document
  try {
    await document.destroy();
  } catch (e) {
    throw httpErrors.BadRequest('Error while deleting document');
  }

  ctx.body = {
    success: true,
  };
});

export default router;