// @flow
import fs from "fs";
import Router from "koa-router";
import { ValidationError } from "../errors";
import { exportCollections } from "../logistics";
import auth from "../middlewares/authentication";
import {
  Collection,
  CollectionUser,
  CollectionGroup,
  Team,
  Event,
  User,
  Group,
} from "../models";
import policy from "../policies";
import {
  presentCollection,
  presentUser,
  presentPolicies,
  presentMembership,
  presentGroup,
  presentCollectionGroupMembership,
} from "../presenters";
import { Op } from "../sequelize";
import { archiveCollection, archiveCollections } from "../utils/zip";
import pagination from "./middlewares/pagination";

const { authorize } = policy;
const router = new Router();

router.post("collections.create", auth(), async (ctx) => {
  const {
    name,
    color,
    description,
    icon,
    sort = Collection.DEFAULT_SORT,
  } = ctx.body;
  const isPrivate = ctx.body.private;
  ctx.assertPresent(name, "name is required");

  if (color) {
    ctx.assertHexColor(color, "Invalid hex value (please use format #FFFFFF)");
  }

  const user = ctx.state.user;
  authorize(user, "create", Collection);

  let collection = await Collection.create({
    name,
    description,
    icon,
    color,
    teamId: user.teamId,
    createdById: user.id,
    private: isPrivate,
    sort,
  });

  await Event.create({
    name: "collections.create",
    collectionId: collection.id,
    teamId: collection.teamId,
    actorId: user.id,
    data: { name },
    ip: ctx.request.ip,
  });

  // we must reload the collection to get memberships for policy presenter
  if (isPrivate) {
    collection = await Collection.scope({
      method: ["withMembership", user.id],
    }).findByPk(collection.id);
  }

  ctx.body = {
    data: presentCollection(collection),
    policies: presentPolicies(user, [collection]),
  };
});

router.post("collections.info", auth(), async (ctx) => {
  const { id } = ctx.body;
  ctx.assertUuid(id, "id is required");

  const user = ctx.state.user;
  const collection = await Collection.scope({
    method: ["withMembership", user.id],
  }).findByPk(id);
  authorize(user, "read", collection);

  ctx.body = {
    data: presentCollection(collection),
    policies: presentPolicies(user, [collection]),
  };
});

router.post("collections.add_group", auth(), async (ctx) => {
  const { id, groupId, permission = "read_write" } = ctx.body;
  ctx.assertUuid(id, "id is required");
  ctx.assertUuid(groupId, "groupId is required");

  const collection = await Collection.scope({
    method: ["withMembership", ctx.state.user.id],
  }).findByPk(id);
  authorize(ctx.state.user, "update", collection);

  const group = await Group.findByPk(groupId);
  authorize(ctx.state.user, "read", group);

  let membership = await CollectionGroup.findOne({
    where: {
      collectionId: id,
      groupId,
    },
  });

  if (!membership) {
    membership = await CollectionGroup.create({
      collectionId: id,
      groupId,
      permission,
      createdById: ctx.state.user.id,
    });
  } else if (permission) {
    membership.permission = permission;
    await membership.save();
  }

  await Event.create({
    name: "collections.add_group",
    collectionId: collection.id,
    teamId: collection.teamId,
    actorId: ctx.state.user.id,
    data: { name: group.name, groupId },
    ip: ctx.request.ip,
  });

  ctx.body = {
    data: {
      collectionGroupMemberships: [
        presentCollectionGroupMembership(membership),
      ],
    },
  };
});

router.post("collections.remove_group", auth(), async (ctx) => {
  const { id, groupId } = ctx.body;
  ctx.assertUuid(id, "id is required");
  ctx.assertUuid(groupId, "groupId is required");

  const collection = await Collection.scope({
    method: ["withMembership", ctx.state.user.id],
  }).findByPk(id);
  authorize(ctx.state.user, "update", collection);

  const group = await Group.findByPk(groupId);
  authorize(ctx.state.user, "read", group);

  await collection.removeGroup(group);

  await Event.create({
    name: "collections.remove_group",
    collectionId: collection.id,
    teamId: collection.teamId,
    actorId: ctx.state.user.id,
    data: { name: group.name, groupId },
    ip: ctx.request.ip,
  });

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

router.post(
  "collections.group_memberships",
  auth(),
  pagination(),
  async (ctx) => {
    const { id, query, permission } = ctx.body;
    ctx.assertUuid(id, "id is required");

    const user = ctx.state.user;
    const collection = await Collection.scope({
      method: ["withMembership", user.id],
    }).findByPk(id);

    authorize(user, "read", collection);

    let where = {
      collectionId: id,
    };

    let groupWhere;

    if (query) {
      groupWhere = {
        name: {
          [Op.iLike]: `%${query}%`,
        },
      };
    }

    if (permission) {
      where = {
        ...where,
        permission,
      };
    }

    const memberships = await CollectionGroup.findAll({
      where,
      order: [["createdAt", "DESC"]],
      offset: ctx.state.pagination.offset,
      limit: ctx.state.pagination.limit,
      include: [
        {
          model: Group,
          as: "group",
          where: groupWhere,
          required: true,
        },
      ],
    });

    ctx.body = {
      pagination: ctx.state.pagination,
      data: {
        collectionGroupMemberships: memberships.map(
          presentCollectionGroupMembership
        ),
        groups: memberships.map((membership) => presentGroup(membership.group)),
      },
    };
  }
);

router.post("collections.add_user", auth(), async (ctx) => {
  const { id, userId, permission = "read_write" } = ctx.body;
  ctx.assertUuid(id, "id is required");
  ctx.assertUuid(userId, "userId is required");

  const collection = await Collection.scope({
    method: ["withMembership", ctx.state.user.id],
  }).findByPk(id);
  authorize(ctx.state.user, "update", collection);

  const user = await User.findByPk(userId);
  authorize(ctx.state.user, "read", user);

  let membership = await CollectionUser.findOne({
    where: {
      collectionId: id,
      userId,
    },
  });

  if (!membership) {
    membership = await CollectionUser.create({
      collectionId: id,
      userId,
      permission,
      createdById: ctx.state.user.id,
    });
  } else if (permission) {
    membership.permission = permission;
    await membership.save();
  }

  await Event.create({
    name: "collections.add_user",
    userId,
    collectionId: collection.id,
    teamId: collection.teamId,
    actorId: ctx.state.user.id,
    data: { name: user.name },
    ip: ctx.request.ip,
  });

  ctx.body = {
    data: {
      users: [presentUser(user)],
      memberships: [presentMembership(membership)],
    },
  };
});

router.post("collections.remove_user", auth(), async (ctx) => {
  const { id, userId } = ctx.body;
  ctx.assertUuid(id, "id is required");
  ctx.assertUuid(userId, "userId is required");

  const collection = await Collection.scope({
    method: ["withMembership", ctx.state.user.id],
  }).findByPk(id);
  authorize(ctx.state.user, "update", collection);

  const user = await User.findByPk(userId);
  authorize(ctx.state.user, "read", user);

  await collection.removeUser(user);

  await Event.create({
    name: "collections.remove_user",
    userId,
    collectionId: collection.id,
    teamId: collection.teamId,
    actorId: ctx.state.user.id,
    data: { name: user.name },
    ip: ctx.request.ip,
  });

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

// DEPRECATED: Use collection.memberships which has pagination, filtering and permissions
router.post("collections.users", auth(), async (ctx) => {
  const { id } = ctx.body;
  ctx.assertUuid(id, "id is required");

  const user = ctx.state.user;
  const collection = await Collection.scope({
    method: ["withMembership", user.id],
  }).findByPk(id);
  authorize(user, "read", collection);

  const users = await collection.getUsers();

  ctx.body = {
    data: users.map(presentUser),
  };
});

router.post("collections.memberships", auth(), pagination(), async (ctx) => {
  const { id, query, permission } = ctx.body;
  ctx.assertUuid(id, "id is required");

  const user = ctx.state.user;
  const collection = await Collection.scope({
    method: ["withMembership", user.id],
  }).findByPk(id);
  authorize(user, "read", collection);

  let where = {
    collectionId: id,
  };

  let userWhere;

  if (query) {
    userWhere = {
      name: {
        [Op.iLike]: `%${query}%`,
      },
    };
  }

  if (permission) {
    where = {
      ...where,
      permission,
    };
  }

  const memberships = await CollectionUser.findAll({
    where,
    order: [["createdAt", "DESC"]],
    offset: ctx.state.pagination.offset,
    limit: ctx.state.pagination.limit,
    include: [
      {
        model: User,
        as: "user",
        where: userWhere,
        required: true,
      },
    ],
  });

  ctx.body = {
    pagination: ctx.state.pagination,
    data: {
      memberships: memberships.map(presentMembership),
      users: memberships.map((membership) => presentUser(membership.user)),
    },
  };
});

router.post("collections.export", auth(), async (ctx) => {
  const { id } = ctx.body;
  ctx.assertUuid(id, "id is required");

  const user = ctx.state.user;
  const collection = await Collection.scope({
    method: ["withMembership", user.id],
  }).findByPk(id);
  authorize(user, "export", collection);

  const filePath = await archiveCollection(collection);

  await Event.create({
    name: "collections.export",
    collectionId: collection.id,
    teamId: user.teamId,
    actorId: user.id,
    data: { title: collection.title },
    ip: ctx.request.ip,
  });

  ctx.attachment(`${collection.name}.zip`);
  ctx.set("Content-Type", "application/force-download");
  ctx.body = fs.createReadStream(filePath);
});

router.post("collections.export_all", auth(), async (ctx) => {
  const { download = false } = ctx.body;

  const user = ctx.state.user;
  const team = await Team.findByPk(user.teamId);
  authorize(user, "export", team);

  await Event.create({
    name: "collections.export",
    teamId: user.teamId,
    actorId: user.id,
    ip: ctx.request.ip,
  });

  if (download) {
    const collections = await Collection.findAll({
      where: { teamId: team.id },
      order: [["name", "ASC"]],
    });
    const filePath = await archiveCollections(collections);

    ctx.attachment(`${team.name}.zip`);
    ctx.set("Content-Type", "application/force-download");
    ctx.body = fs.createReadStream(filePath);
  } else {
    // async operation to create zip archive and email user
    exportCollections(user.teamId, user.email);

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

router.post("collections.update", auth(), async (ctx) => {
  let { id, name, description, icon, color, sort } = ctx.body;
  const isPrivate = ctx.body.private;

  if (color) {
    ctx.assertHexColor(color, "Invalid hex value (please use format #FFFFFF)");
  }

  const user = ctx.state.user;
  const collection = await Collection.scope({
    method: ["withMembership", user.id],
  }).findByPk(id);

  authorize(user, "update", collection);

  // we're making this collection private right now, ensure that the current
  // user has a read-write membership so that at least they can edit it
  if (isPrivate && !collection.private) {
    await CollectionUser.findOrCreate({
      where: {
        collectionId: collection.id,
        userId: user.id,
      },
      defaults: {
        permission: "read_write",
        createdById: user.id,
      },
    });
  }

  const isPrivacyChanged = isPrivate !== collection.private;

  if (name !== undefined) {
    collection.name = name;
  }
  if (description !== undefined) {
    collection.description = description;
  }
  if (icon !== undefined) {
    collection.icon = icon;
  }
  if (color !== undefined) {
    collection.color = color;
  }
  if (isPrivate !== undefined) {
    collection.private = isPrivate;
  }
  if (sort !== undefined) {
    collection.sort = sort;
  }

  await collection.save();

  await Event.create({
    name: "collections.update",
    collectionId: collection.id,
    teamId: collection.teamId,
    actorId: user.id,
    data: { name },
    ip: ctx.request.ip,
  });

  // must reload to update collection membership for correct policy calculation
  // if the privacy level has changed. Otherwise skip this query for speed.
  if (isPrivacyChanged) {
    await collection.reload();
  }

  ctx.body = {
    data: presentCollection(collection),
    policies: presentPolicies(user, [collection]),
  };
});

router.post("collections.list", auth(), pagination(), async (ctx) => {
  const user = ctx.state.user;
  const collectionIds = await user.collectionIds();
  let collections = await Collection.scope({
    method: ["withMembership", user.id],
  }).findAll({
    where: {
      teamId: user.teamId,
      id: collectionIds,
    },
    order: [["updatedAt", "DESC"]],
    offset: ctx.state.pagination.offset,
    limit: ctx.state.pagination.limit,
  });

  ctx.body = {
    pagination: ctx.state.pagination,
    data: collections.map(presentCollection),
    policies: presentPolicies(user, collections),
  };
});

router.post("collections.delete", auth(), async (ctx) => {
  const { id } = ctx.body;
  const user = ctx.state.user;
  ctx.assertUuid(id, "id is required");

  const collection = await Collection.scope({
    method: ["withMembership", user.id],
  }).findByPk(id);

  authorize(user, "delete", collection);

  const total = await Collection.count();
  if (total === 1) throw new ValidationError("Cannot delete last collection");

  await collection.destroy();

  await Event.create({
    name: "collections.delete",
    collectionId: collection.id,
    teamId: collection.teamId,
    actorId: user.id,
    data: { name: collection.name },
    ip: ctx.request.ip,
  });

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

export default router;
