import API from "@/services/imapAPI";
import { isSeenFc } from "@/utils/flagsUtils";
import { decodeEmojis } from "@/utils/string";
import { AxiosError, AxiosResponse } from "axios";
import { createStore } from "vuex";
import { Room, Account, Address, RoomType, Message, LoadingState } from "./models/model";

interface RoomFromBack {
    id: number;
    roomName: string;
    roomType: RoomType;
    mailboxId: number;
    user: string;
    userId: number;
    notSeen: number;
    parent_id?: number;
    // todo thread
}

interface AccountFromBack {
    id: number;
    email: string;
}

const buffer: RoomFromBack[] = [];

function createRoom(options: RoomFromBack): Room {
    return {
        id: options.id,
        roomName: decodeEmojis(options.roomName),
        roomType: options.roomType,
        mailboxId: options.mailboxId,
        userId: options.userId,
        members: [],
        user: options.user,
        notSeen: options.notSeen,
        threadIds: [],
    };
}

interface roomMessage {
    roomId: number;
    fetch: LoadingState;
    messages: Message[];
}

export interface State {
    accounts: Account[];
    activeAccount: number;
    rooms: Room[];
    activeRoom: number;
    roomMessages: roomMessage[];
}

const roomOnId = (state: State, roomId: number): Room | undefined =>
    state.rooms.find((room: Room) => room.id == roomId);
const msgOnRoomId = (state: State, roomId: number) => state.roomMessages.find((roomMsg) => roomMsg.roomId == roomId);

function updateSeen(state: State, roomId: number, flag: string[], adding: boolean) {
    // if is seen flag decrement unread value
    if (isSeenFc(flag)) {
        const room = roomOnId(state, roomId);
        if (!room) return;
        if (adding) {
            room.notSeen--;
        } else {
            room.notSeen++;
        }
        // if is thread change seen on parent
        if (room.roomType == RoomType.THREAD) {
            const parentRoom = state.rooms.find((room) => room.threadIds.includes(roomId));
            if (parentRoom) {
                if (adding) {
                    parentRoom.notSeen--;
                } else {
                    parentRoom.notSeen++;
                }
            }
        }
    }
}
// define injection key todo
// export const key: InjectionKey<Store<State>> = Symbol()

const store = createStore<State>({
    state: {
        accounts: [{ id: 0, email: "All", fetched: false }],
        activeAccount: 0,
        rooms: [],
        activeRoom: 0,
        roomMessages: [],
    },
    mutations: {
        setActiveAccount(state, payload) {
            state.activeAccount = payload;
            const account = state.accounts.find((account) => account.id == payload);
            store.dispatch("fetchRooms", { accountId: payload, account: account });
        },
        setActiveRoom(state, payload) {
            state.activeRoom = payload;
            // todo load room on load page
            const room = state.rooms.find((room) => room.id == payload);
            if (!room) return;
            let roomMessage = msgOnRoomId(state, payload);
            if (!roomMessage) {
                state.roomMessages.push({ messages: [], fetch: LoadingState.notLoaded, roomId: payload });
                roomMessage = msgOnRoomId(state, payload);
            }
            store.dispatch("fetchMessages", {
                roomId: payload,
                obj: roomMessage,
            });
        },
        addAccounts(state, payload) {
            payload.forEach((account: AccountFromBack) => {
                state.accounts.push({ id: account.id, email: account.email, fetched: false });
            });
        },
        addRooms(state, payload) {
            // todo add if not exist
            payload.rooms.forEach((room: RoomFromBack) => {
                if (room.roomType == RoomType.THREAD) {
                    buffer.push(room);
                }
                state.rooms.push(createRoom(room));
            });

            buffer.forEach((thread) => {
                const parentRoom = state.rooms.find((room) => room.id == thread.parent_id); // todo debug parent_id to root_id
                if (parentRoom) {
                    parentRoom.threadIds.push(thread.id);
                } else {
                    console.log("yep...");
                }
            });
        },
        addMessages(state, payload) {
            // todo add if not exist
            const room = roomOnId(state, payload.roomId);
            if (!room) return;
            let roomMessage = msgOnRoomId(state, payload.roomId);
            if (!roomMessage) {
                state.roomMessages.push({ roomId: payload.roomId, messages: [], fetch: LoadingState.notLoaded });
                roomMessage = msgOnRoomId(state, payload.roomId);
            }
            if (!roomMessage) return;

            payload.messages.forEach((message: any) => {
                message.flags = message.flags?.split(",") ?? [];
                roomMessage?.messages.push(message);
            });
        },
        addAddress(state, payload) {
            // todo add if not exist
            const room = roomOnId(state, payload.roomId);
            if (!room) return;
            payload.addresses.forEach((address: Address) => {
                room.members.push(address);
            });
        },
        addFlag(state, payload) {
            const msg = msgOnRoomId(state, payload.roomId)?.messages.find((msg) => msg.id == payload.messageId);
            if (msg) {
                msg.flags.push(payload.flag);
                updateSeen(state, payload.roomId, payload.flag, true);
            }
        },
        removeFlag(state, payload) {
            const msg = msgOnRoomId(state, payload.roomId)?.messages.find((msg) => msg.id == payload.messageId);
            if (msg) {
                msg.flags?.splice(msg.flags?.indexOf(payload.flag), 1);
                updateSeen(state, payload.roomId, payload.flag, false);
            }
        },
    },
    getters: {
        rooms: (state) => (): Room[] => {
            if (state.activeAccount === 0) return state.rooms;
            return state.rooms.filter(
                (room) => room.mailboxId == state.activeAccount && room.roomType != RoomType.THREAD,
            );
        },
        room:
            (state) =>
            (roomId: number): Room | undefined => {
                return roomOnId(state, roomId);
            },
        address:
            (state) =>
            (roomId: number, addressId: number): Address | undefined => {
                const room = roomOnId(state, roomId);
                const address = room?.members.find((address) => address.id == addressId);
                return address;
            },
        messages:
            (state) =>
            (roomId: number): Message[] => {
                const roomMessage = msgOnRoomId(state, roomId);
                if (roomMessage) return roomMessage.messages;
                state.roomMessages.push({ messages: [], roomId: roomId, fetch: LoadingState.notLoaded });
                store.dispatch("fetchMessages", { roomId: roomId, obj: msgOnRoomId(state, roomId) });
                return msgOnRoomId(state, roomId)?.messages ?? [];
            },
    },
    actions: {
        fetchAccounts: async (context) => {
            API.getAccounts()
                .then((res: AxiosResponse) => {
                    context.commit("addAccounts", res.data);
                })
                .catch((err: AxiosError) => {
                    console.log(err);
                });
        },
        fetchRooms: async (context, data) => {
            if (data.account?.fetched == false) {
                API.getRooms(data.accountId)
                    .then((res: AxiosResponse) => {
                        data.account.fetched = true;
                        context.commit("addRooms", { rooms: res.data });
                    })
                    .catch((err: AxiosError) => {
                        console.log(err);
                    });
            }
        },
        fetchMessages: async (context, data) => {
            if (data.obj.fetch === LoadingState.notLoaded) {
                data.obj.fetch = LoadingState.loading;
                store.dispatch("fetchRoomMembers", { roomId: data.roomId });
                API.getMessages(data.roomId)
                    .then((res: AxiosResponse) => {
                        data.obj.fetch = LoadingState.loaded;
                        context.commit("addMessages", { messages: res.data, roomId: data.roomId });
                    })
                    .catch((err: AxiosError) => {
                        data.obj.fetch = LoadingState.notLoaded;
                        console.log(err);
                    });
            }
        },
        fetchRoomMembers: async (context, data) => {
            API.getMembers(data.roomId)
                .then((res: AxiosResponse) => {
                    context.commit("addAddress", { addresses: res.data, roomId: data.roomId });
                })
                .catch((err: AxiosError) => {
                    console.log(err);
                });
        },
    },
});

export default store;