// - Import firebase component
import firebase, { firebaseRef } from 'app/firebase/'

// - Import utility components
import moment from 'moment'

// - Import action types
import * as types from 'actionTypes'


// - Import actions
import * as globalActions from 'globalActions'
import * as postActions from 'postActions'
import * as userActions from 'userActions'
import * as notifyActions from 'notifyActions'





/* _____________ CRUD DB _____________ */


/**
 * Add a circle
 * @param {string} circleName 
 */
export var dbAddCircle = (circleName) => {
  return (dispatch, getState) => {

    let uid = getState().authorize.uid
    let circle = {
      creationDate: moment().unix(),
      name: circleName,
      users: {}
    }

    let circleRef = firebaseRef.child(`userCircles/${uid}/circles`).push(circle)
    return circleRef.then(() => {
      dispatch(addCircle(uid, {
        ...circle,
        id: circleRef.key
      }))

    }, (error) => dispatch(globalActions.showErrorMessage(error.message)))

  }
}

/**
 * Add a user in a circle
 * @param {string} cid is circle identifier 
 * @param {object} userFollowing is the user for following
 */
export var dbAddFollowingUser = (cid, userFollowing) => {
  return (dispatch, getState) => {

    let uid = getState().authorize.uid
    let user = getState().user.info[uid]

    let userCircle = {
      creationDate: moment().unix(),
      fullName: userFollowing.fullName,
      avatar: userFollowing.avatar || ''
    }
    let userFollower = {
      creationDate: moment().unix(),
      fullName: user.fullName,
      avatar: user.avatar || '',
      approved: false
    }
    let updates = {}
    updates[`userCircles/${uid}/circles/${cid}/users/${userFollowing.userId}`] = userCircle
    updates[`userCircles/${userFollowing.userId}/circles/-Followers/users/${uid}`] = userFollower
    return firebaseRef.update(updates).then((result) => {
      dispatch(addFollowingUser(uid, cid, userFollowing.userId, { ...userCircle }))
  
        dispatch(notifyActions.dbAddNotify(
          {
            description: `${user.fullName} follow you.`,
            url: `/${uid}`,
            notifyRecieverUserId: userFollowing.userId, notifierUserId: uid
          }))

    }, (error) => {
      dispatch(globalActions.showErrorMessage(error.message))
    })
  }
}


/**
 * Add a user in a circle
 * @param {string} cid is circle identifier 
 * @param {string} followingId following user identifier
 */
export var dbDeleteFollowingUser = (cid, followingId) => {
  return (dispatch, getState) => {

    let uid = getState().authorize.uid

    let updates = {}
    updates[`userCircles/${uid}/circles/${cid}/users/${followingId}`] = null
    updates[`userCircles/${followingId}/circles/-Followers/users/${uid}`] = null
    return firebaseRef.update(updates).then((result) => {
      dispatch(deleteFollowingUser(uid, cid, followingId))
    }, (error) => {
      dispatch(globalActions.showErrorMessage(error.message))
    })
  }
}

/**
 * Update a circle from database
 * @param  {object} newCircle
 */
export const dbUpdateCircle = (newCircle) => {
  return (dispatch, getState) => {

    // Get current user id
    var uid = getState().authorize.uid

    // Write the new data simultaneously in the list
    let updates = {}
    let circle = getState().circle.userCircles[uid][newCircle.id]
    let updatedCircle = {
      name: newCircle.name || circle.name,
      users: newCircle.users ? newCircle.users : (circle.users || [])
    }
    updates[`userCircles/${uid}/circles/${newCircle.id}`] = updatedCircle
    return firebaseRef.update(updates).then((result) => {
      dispatch(updateCircle(uid, { id: newCircle.id, ...updatedCircle }))
    }, (error) => {
      dispatch(globalActions.showErrorMessage(error.message))
    })
  }

}


/**
 * Delete a circle from database
 * @param  {string} id is circle identifier
 */
export const dbDeleteCircle = (id) => {
  return (dispatch, getState) => {

    // Get current user id
    var uid = getState().authorize.uid

    // Write the new data simultaneously in the list
    var updates = {};
    updates[`userCircles/${uid}/circles/${id}`] = null;

    return firebaseRef.update(updates).then((result) => {
      dispatch(deleteCircle(uid, id))
    }, (error) => {
      dispatch(globalActions.showErrorMessage(error.message))
    });
  }

}

/**
 *  Get all user circles from data base
 */
export const dbGetCircles = () => {
  return (dispatch, getState) => {
    var uid = getState().authorize.uid
    if (uid) {
      var circlesRef = firebaseRef.child(`userCircles/${uid}/circles`);

      return circlesRef.once('value').then((snapshot) => {
        var circles = snapshot.val() || {};
        var parsedCircles = {};
        Object.keys(circles).forEach((circleId) => {
          if (circleId !== '-Followers' && circles[circleId].users) {
            Object.keys(circles[circleId].users).filter((v, i, a) => a.indexOf(v) === i).forEach((userId) => {
              dispatch(postActions.dbGetPostsByUserId(userId))
              dispatch(userActions.dbGetUserInfoByUserId(userId))
            })
          }
          parsedCircles[circleId] = {
            id: circleId,
            ...circles[circleId]
          }
        })

        dispatch(addCircles(uid, parsedCircles));
      });

    }
  }
}


/**
 *  Get all user circles from data base by user id
 */
export const dbGetCirclesByUserId = (uid) => {
  return (dispatch, getState) => {

    if (uid) {
      var circlesRef = firebaseRef.child(`userCircles/${uid}/circles`);

      return circlesRef.once('value').then((snapshot) => {
        var circles = snapshot.val() || {};
        var parsedCircles = {};
        Object.keys(circles).forEach((circleId) => {
          parsedCircles[circleId] = {
            id: circleId,
            ...circles[circleId]
          }
        })
        dispatch(addCircles(uid, parsedCircles));
      })

    }
  }
}






/* _____________ CRUD State _____________ */

/**
 * Add a normal circle
 * @param {string} uid is user identifier
 * @param {object} circle 
 */
export const addCircle = (uid, circle) => {
  return {
    type: types.ADD_CIRCLE,
    payload: { uid, circle }
  }
}

/**
 * Update a circle
 * @param {string} uid is user identifier
 * @param {object} circle 
 */
export const updateCircle = (uid, circle) => {
  return {
    type: types.UPDATE_CIRCLE,
    payload: { uid, circle }
  }
}

/**
 * Delete a circle
 * @param {string} uid is user identifier
 * @param {string} id is circle identifier
 */
export const deleteCircle = (uid, id) => {
  return {
    type: types.DELETE_CIRCLE,
    payload: { uid, id }
  }
}


/**
 * Add a list of circle
 * @param {string} uid 
 * @param {[object]} circles 
 */
export const addCircles = (uid, circles) => {
  return {
    type: types.ADD_LIST_CIRCLE,
    payload: { uid, circles }
  }
}

/**
 * Clea all data in circle store
 */
export const clearAllCircles = () => {
  return {
    type: types.CLEAR_ALL_CIRCLES
  }
}


/**
 * Open circle settings
 */
export const openCircleSettings = (uid, id) => {
  return {
    type: types.OPEN_CIRCLE_SETTINGS,
    payload: { uid, id }
  }

}

/**
 * Close open circle settings
 */
export const closeCircleSettings = (uid, id) => {
  return {
    type: types.CLOSE_CIRCLE_SETTINGS,
    payload: { uid, id }
  }

}

/**
 * Add following user in a circle
 * @param {string} uid user identifire who want to follow the following user
 * @param {string} cid circle identifier that following user should be added in
 * @param {string} followingId following user identifier
 * @param {object} userCircle information about following user
 */
export const addFollowingUser = (uid, cid, followingId, userCircle) => {
  return {
    type: types.ADD_FOLLOWING_USER,
    payload: { uid, cid, followingId, userCircle }
  }

}

/**
 * Delete following user from a circle
 * @param {string} uid user identifire who want to follow the following user
 * @param {string} cid circle identifier that following user should be added in
 * @param {string} followingId following user identifier
 */
export const deleteFollowingUser = (uid, cid, followingId) => {
  return {
    type: types.DELETE_FOLLOWING_USER,
    payload: { uid, cid, followingId }
  }

}