import React, { Component, Fragment } from 'react'
import PropTypes from 'prop-types'
import autobind from 'autobind-decorator'
import { UserList } from './UserList'
import { UserForm } from './UserForm'
import { UserFormPlaceholder } from './UserFormPlaceholder'
import { api } from 'src/API'
import { Row, Column, Box } from 'ui'
import { YesNoMessageModal, MessageModal, ChangeEmailModal, WaitModal } from '../Modal'
import { sizeInfo, colorInfo } from 'ui/style'

export class Users extends Component {
  static propTypes = {
    changeTitle: PropTypes.func.isRequired,
  }

  constructor(props) {
    super(props)
    this.state = {
      modified: false,
      selectedUser: null,
      users: [],
      yesNoModal: null,
      messageModal: null,
      waitModal: null,
      changeEmailModal: null,
    }
  }

  componentDidMount() {
    this.props.changeTitle('Users')

    api.listUsers().then((list) => {
      list.items.sort((userA, userB) => (userA.lastName.localeCompare(userB.lastName)))
      this.setState({ users: list.items, selectedUser: list.items[0] }) // TODO: <- Remove
    }).catch((error) => {
      this.setState({
        messageModal: {
          icon: 'hand',
          message: 'Unable to get the list of users.',
          detail: error.message,
        }
      })
    })
  }

  componentWillUnmount() {
    this.props.changeTitle('')
  }

  removeUnfinishedNewUser() {
    let users = this.state.users

    if (users.length > 0 && !users[0]._id) {
      this.setState({ users: this.state.users.slice(1) })
    }
  }

  @autobind
  handleUserListClick(e, index) {
    let user = this.state.users[index]

    if (this.state.modified) {
      this.nextSelectedUser = user
      this.setState({
        yesNoModal: {
          question: 'This user has been modified. Are you sure you would like to navigate away?',
          onDismiss: this.handleModifiedModalDismiss
        }
      })
    } else {
      this.setState({ selectedUser: user })
      this.removeUnfinishedNewUser()
    }
  }

  @autobind
  handleSave(user) {
    if (user._id) {
      this.setState({ waitModal: { message: 'Updating User' } })
      api.updateUser(user).then((updatedUser) => {
        this.setState({
          waitModal: null,
          users: this.state.users.map((user) => (user._id === updatedUser._id ? updatedUser : user)),
          modified: false,
          selectedUser: updatedUser
        })
      }).catch((error) => {
        this.setState({
          waitModal: null,
          messageModal: {
            icon: 'hand',
            message: 'Unable to save the user changes',
            detail: error.message,
          }
        })
      })
    } else {
      this.setState({ waitModal: { message: 'Creating User' } })
      api.createUser(user).then((createdUser) => {
        this.setState({
          waitModal: false,
          users: this.state.users.map((user) => (!user._id ? createdUser : user)).sort((a, b) => (
            a.lastName < b.lastName ? -1 : a.lastName > b.lastName : 0
          )),
          modified: false,
          selectedUser: createdUser
        })
      }).catch((error) => {
        this.setState({
          waitModal: null,
          messageModal: {
            icon: 'hand',
            message: 'Unable to create the user.',
            detail: error.message,
          }
        })
      })
    }
  }

  @autobind
  handleChangeEmail() {
    this.setState({ changeEmailModal: { oldEmail: this.state.selectedUser.email } })
  }

  @autobind
  handleResendEmail() {
    this.setState({
      waitModal: { message: 'Resending Email...' }
    })
    api.sendConfirmEmail({ existingEmail: this.state.selectedUser.email }).then(() => {
      this.setState({
        waitModal: null,
        messageModal: {
          icon: 'thumb',
          message: `An email has been sent to '${this.state.selectedUser.email}' with further instructions.`
        }
      })
    }).catch((error) => {
      this.setState({
        error: true,
        waitModal: null,
        messageModal: {
          icon: 'hand',
          message: 'Unable to request email change.',
          detail: error.message,
        }
      })
    })
  }

  @autobind
  handleChangeEmailDismiss(newEmail) {
    this.setState({ changeEmailModal: null })
    if (!newEmail) {
      return
    }
    this.setState({
      waitModal: { message: 'Requesting Email Change...' }
    })
    if (this.state.selectedUser) {
      api.sendConfirmEmail({ existingEmail: this.state.selectedUser.email, newEmail }).then(() => {
        this.setState({
          waitModal: null,
          messageModal: {
            icon: 'hand',
            message: `An email has been sent to '${newEmail}' to confirm this email.`
          }
        })
      }).catch((error) => {
        this.setState({
          error: true,
          waitModal: null,
          messageModal: {
            icon: 'hand',
            message: 'Unable to request email change.',
            detail: error.message,
          }
        })
      })
    }
  }

  @autobind
  handleRemove() {
    this.setState({
      yesNoModal: {
        question: 'Are you sure you want to remove this user? This will also remove them from any teams they belong to.',
        onDismiss: this.handleRemoveModalDismiss
      }
    })
  }

  @autobind
  handleRemoveModalDismiss(yes) {
    if (yes) {
      const selectedUserId = this.state.selectedUser._id
      const selectedIndex = this.state.users.findIndex((user) => (user._id === selectedUserId))

      if (selectedIndex >= 0) {
        this.setState({ waitModal: { message: 'Removing User' } })
        api.deleteUser(selectedUserId).then(() => {
          this.setState({
            waitModal: null,
            users: [...this.state.users.slice(0, selectedIndex), ...this.state.users.slice(selectedIndex + 1)],
            selectedUser: null
          })
        }).catch((error) => {
          this.setState({
            waitModal: null,
            messageModal: {
              icon: 'hand',
              message: 'Unable to remove the user.',
              detail: error.message,
            }
          })
        })
      }
    }

    this.setState({
      yesNoModal: null
    })
  }

  @autobind
  handleModifiedModalDismiss(yes) {
    if (yes) {
      this.setState({
        selectedUser: this.nextSelectedUser,
        modified: false
      })
      this.removeUnfinishedNewUser()
      delete this.nextSelectedUser
    }

    this.setState({
      yesNoModal: null
    })
  }

  @autobind
  handleMessageModalDismiss() {
    this.setState({ messageModal: null })
  }

  @autobind
  handleModifiedChanged(modified) {
    this.setState({ modified: modified })
  }

  @autobind
  handleAddNewUser() {
    let newUser = {}
    let newUsers = [newUser].concat(this.state.users)
    this.setState({ users: newUsers, selectedUser: newUser })
  }

  render() {
    const { messageModal, yesNoModal, changeEmailModal } = this.state

    return (
      <Fragment>
        <Column.Item height={sizeInfo.formColumnSpacing} />
        <Column.Item grow>
          <Row fillParent>
            <Row.Item width={sizeInfo.formRowSpacing} />
            <Row.Item width='25vw'>
              <UserList users={this.state.users} selectedUser={this.state.selectedUser}
                selectionModified={this.state.modified} onUserListClick={this.handleUserListClick}
                onAddNewUser={this.handleAddNewUser} />
            </Row.Item>
            <Row.Item width={sizeInfo.formRowSpacing} />
            <Row.Item grow>
              <Box border={{ width: sizeInfo.headerBorderWidth, color: colorInfo.headerBorder }} radius={sizeInfo.formBoxRadius}>
                {
                  this.state.selectedUser
                    ? <UserForm user={this.state.selectedUser} onSave={this.handleSave}
                      onRemove={this.handleRemove} onModifiedChanged={this.handleModifiedChanged}
                      onChangeEmail={this.handleChangeEmail} onResendEmail={this.handleResendEmail} />
                    : <UserFormPlaceholder />
                }
              </Box>
            </Row.Item>
            <Row.Item width={sizeInfo.formRowSpacing} />
          </Row>
        </Column.Item>
        <Column.Item height={sizeInfo.formColumnSpacing}>
          <ChangeEmailModal open={!!changeEmailModal}
            oldEmail={changeEmailModal && changeEmailModal.oldEmail}
            onDismiss={this.handleChangeEmailDismiss} />

          <YesNoMessageModal open={!!yesNoModal}
            question={yesNoModal ? yesNoModal.question : ''}
            onDismiss={yesNoModal && yesNoModal.onDismiss} />

          <MessageModal
            open={!!messageModal}
            icon={messageModal ? messageModal.icon : ''}
            message={messageModal ? messageModal.message : ''}
            detail={messageModal && messageModal.detail}
            onDismiss={this.handleMessageModalDismiss} />

          <WaitModal active={!!this.state.waitModal} message={this.state.waitModal ? this.state.waitModal.message : ''} />
        </Column.Item>
      </Fragment>
    )
  }
}