import { omit } from 'lodash';

import { trigger } from '../../shims/events';
import { NoopActionType } from './noop';

// State

export type MessageType = {
  id: string;
  conversationId: string;
  receivedAt: number;

  snippet: string;

  from: {
    phoneNumber: string;
    isMe?: boolean;
    name?: string;
    color?: string;
    profileName?: string;
    avatarPath?: string;
  };

  to: {
    groupName?: string;
    phoneNumber: string;
    isMe?: boolean;
    name?: string;
    profileName?: string;
  };

  isSelected?: boolean;
};
export type ConversationType = {
  id: string;
  name?: string;
  activeAt?: number;
  timestamp: number;
  lastMessage?: {
    status: 'error' | 'sending' | 'sent' | 'delivered' | 'read';
    text: string;
  };
  phoneNumber: string;
  type: 'direct' | 'group';
  isMe: boolean;
  lastUpdated: number;
  unreadCount: number;
  isSelected: boolean;
  isTyping: boolean;
};
export type ConversationLookupType = {
  [key: string]: ConversationType;
};

export type ConversationsStateType = {
  conversationLookup: ConversationLookupType;
  selectedConversation?: string;
};

// Actions

type ConversationAddedActionType = {
  type: 'CONVERSATION_ADDED';
  payload: {
    id: string;
    data: ConversationType;
  };
};
type ConversationChangedActionType = {
  type: 'CONVERSATION_CHANGED';
  payload: {
    id: string;
    data: ConversationType;
  };
};
type ConversationRemovedActionType = {
  type: 'CONVERSATION_REMOVED';
  payload: {
    id: string;
  };
};
export type RemoveAllConversationsActionType = {
  type: 'CONVERSATIONS_REMOVE_ALL';
  payload: null;
};
export type MessageExpiredActionType = {
  type: 'MESSAGE_EXPIRED';
  payload: {
    id: string;
    conversationId: string;
  };
};
export type SelectedConversationChangedActionType = {
  type: 'SELECTED_CONVERSATION_CHANGED';
  payload: {
    id: string;
    messageId?: string;
  };
};

export type ConversationActionType =
  | ConversationAddedActionType
  | ConversationChangedActionType
  | ConversationRemovedActionType
  | RemoveAllConversationsActionType
  | MessageExpiredActionType
  | SelectedConversationChangedActionType;

// Action Creators

export const actions = {
  conversationAdded,
  conversationChanged,
  conversationRemoved,
  removeAllConversations,
  messageExpired,
  openConversationInternal,
  openConversationExternal,
};

function conversationAdded(
  id: string,
  data: ConversationType
): ConversationAddedActionType {
  return {
    type: 'CONVERSATION_ADDED',
    payload: {
      id,
      data,
    },
  };
}
function conversationChanged(
  id: string,
  data: ConversationType
): ConversationChangedActionType {
  return {
    type: 'CONVERSATION_CHANGED',
    payload: {
      id,
      data,
    },
  };
}
function conversationRemoved(id: string): ConversationRemovedActionType {
  return {
    type: 'CONVERSATION_REMOVED',
    payload: {
      id,
    },
  };
}
function removeAllConversations(): RemoveAllConversationsActionType {
  return {
    type: 'CONVERSATIONS_REMOVE_ALL',
    payload: null,
  };
}
function messageExpired(
  id: string,
  conversationId: string
): MessageExpiredActionType {
  return {
    type: 'MESSAGE_EXPIRED',
    payload: {
      id,
      conversationId,
    },
  };
}

// Note: we need two actions here to simplify. Operations outside of the left pane can
//   trigger an 'openConversation' so we go through Whisper.events for all conversation
//   selection.
function openConversationInternal(
  id: string,
  messageId?: string
): NoopActionType {
  trigger('showConversation', id, messageId);

  return {
    type: 'NOOP',
    payload: null,
  };
}
function openConversationExternal(
  id: string,
  messageId?: string
): SelectedConversationChangedActionType {
  return {
    type: 'SELECTED_CONVERSATION_CHANGED',
    payload: {
      id,
      messageId,
    },
  };
}

// Reducer

function getEmptyState(): ConversationsStateType {
  return {
    conversationLookup: {},
  };
}

export function reducer(
  state: ConversationsStateType,
  action: ConversationActionType
): ConversationsStateType {
  if (!state) {
    return getEmptyState();
  }

  if (action.type === 'CONVERSATION_ADDED') {
    const { payload } = action;
    const { id, data } = payload;
    const { conversationLookup } = state;

    return {
      ...state,
      conversationLookup: {
        ...conversationLookup,
        [id]: data,
      },
    };
  }
  if (action.type === 'SELECTED_CONVERSATION_CHANGED') {
    const { payload } = action;
    const { id } = payload;

    return {
      ...state,
      selectedConversation: id,
    };
  }
  if (action.type === 'CONVERSATION_CHANGED') {
    const { payload } = action;
    const { id, data } = payload;
    const { conversationLookup } = state;

    // In the change case we only modify the lookup if we already had that conversation
    if (!conversationLookup[id]) {
      return state;
    }

    return {
      ...state,
      conversationLookup: {
        ...conversationLookup,
        [id]: data,
      },
    };
  }
  if (action.type === 'CONVERSATION_REMOVED') {
    const { payload } = action;
    const { id } = payload;
    const { conversationLookup } = state;

    return {
      ...state,
      conversationLookup: omit(conversationLookup, [id]),
    };
  }
  if (action.type === 'CONVERSATIONS_REMOVE_ALL') {
    return getEmptyState();
  }
  if (action.type === 'MESSAGE_EXPIRED') {
    // noop - for now this is only important for search
  }

  return state;
}