import Router from 'koa-router';
import httpErrors from 'http-errors';

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

const router = new Router();

// FIXME: This really needs specs :/
router.post('documents.info', auth({ require: false }), async (ctx) => {
  let { id } = ctx.request.body;
  ctx.assertPresent(id, 'id is required');

  const document = await Document.findOne({
    where: {
      id: id,
    },
  });

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

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


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

  const user = ctx.state.user;
  const ownerAtlas = await Atlas.findOne({
    where: {
      id: atlas,
      teamId: user.teamId,
    },
  });

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

  let parentDocumentObj = {};
  if (parentDocument && ownerAtlas.type === 'atlas') {
    parentDocumentObj = await Document.findOne({
      where: {
        id: parentDocument,
        atlasId: ownerAtlas.id,
      },
    });
  }

  const document = await Document.create({
    parentDocumentId: parentDocumentObj.id,
    atlasId: ownerAtlas.id,
    teamId: user.teamId,
    userId: user.id,
    lastModifiedById: user.id,
    title: title,
    text: text,
  });
  await document.createRevision();

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

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

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

  const user = ctx.state.user;
  let document = await Document.findOne({
    where: {
      id: id,
      teamId: user.teamId,
    },
  });

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

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

  // Update
  const atlas = await Atlas.findById(document.atlasId);
  if (atlas.type === 'atlas') {
    await atlas.updateNavigationTree();
  }

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

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

  const user = ctx.state.user;
  const document = await Document.findOne({
    where: {
      id: id,
      teamId: user.teamId,
    },
  });
  const atlas = await Atlas.findById(document.atlasId);

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

  if (atlas.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 atlas.deleteDocument(document);
      await atlas.save();
    } catch (e) {
      throw httpErrors.BadRequest('Error while deleting');
    };
  } else {
    try {
      await document.destroy();
    } catch (e) {
      throw httpErrors.BadRequest('Error while deleting');
    };
  }

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

export default router;