import { createSlice, createAsyncThunk, PayloadAction } from '@reduxjs/toolkit';
import axios from '../../axios';

// =====================
// Типы
// =====================

export interface Mission {
    missionId: number;
    name: string;
    sortOrder: number;
}

export interface Member {
    userId: number;
    username: string;
    role: string;
}

export interface Contest {
    id: number;
    name: string;
    description: string;
    scheduleType: string;
    startsAt: string;
    endsAt: string;
    attemptDurationMinutes: number | null;
    maxAttempts: number | null;
    allowEarlyFinish: boolean | null;
    groupId: number | null;
    groupName: string | null;
    missions: Mission[];
    articles: any[];
    members: Member[];
}

interface ContestsResponse {
    hasNextPage: boolean;
    contests: Contest[];
}

export interface CreateContestBody {
    name?: string | null;
    description?: string | null;
    scheduleType: 'AlwaysOpen' | 'FixedWindow' | 'RollingWindow';
    visibility: 'Public' | 'GroupPrivate';
    startsAt?: string | null;
    endsAt?: string | null;
    attemptDurationMinutes?: number | null;
    maxAttempts?: number | null;
    allowEarlyFinish?: boolean | null;
    groupId?: number | null;
    missionIds?: number[] | null;
    articleIds?: number[] | null;
    participantIds?: number[] | null;
    organizerIds?: number[] | null;
}

// =====================
// Состояние
// =====================

type Status = 'idle' | 'loading' | 'successful' | 'failed';

interface ContestsState {
    contests: Contest[];
    selectedContest: Contest | null;
    hasNextPage: boolean;
    statuses: {
        fetchList: Status;
        fetchById: Status;
        create: Status;
    };
    error: string | null;
}

const initialState: ContestsState = {
    contests: [],
    selectedContest: null,
    hasNextPage: false,
    statuses: {
        fetchList: 'idle',
        fetchById: 'idle',
        create: 'idle',
    },
    error: null,
};

// =====================
// Async Thunks
// =====================

export const fetchContests = createAsyncThunk(
    'contests/fetchAll',
    async (
        params: {
            page?: number;
            pageSize?: number;
            groupId?: number | null;
        } = {},
        { rejectWithValue },
    ) => {
        try {
            const { page = 0, pageSize = 10, groupId } = params;
            const response = await axios.get<ContestsResponse>('/contests', {
                params: { page, pageSize, groupId },
            });
            return response.data;
        } catch (err: any) {
            return rejectWithValue(
                err.response?.data?.message || 'Failed to fetch contests',
            );
        }
    },
);

export const fetchContestById = createAsyncThunk(
    'contests/fetchById',
    async (id: number, { rejectWithValue }) => {
        try {
            const response = await axios.get<Contest>(`/contests/${id}`);
            return response.data;
        } catch (err: any) {
            return rejectWithValue(
                err.response?.data?.message || 'Failed to fetch contest',
            );
        }
    },
);

export const createContest = createAsyncThunk(
    'contests/create',
    async (contestData: CreateContestBody, { rejectWithValue }) => {
        try {
            const response = await axios.post<Contest>(
                '/contests',
                contestData,
            );
            return response.data;
        } catch (err: any) {
            return rejectWithValue(
                err.response?.data?.message || 'Failed to create contest',
            );
        }
    },
);

// =====================
// Slice
// =====================

const contestsSlice = createSlice({
    name: 'contests',
    initialState,
    reducers: {
        clearSelectedContest: (state) => {
            state.selectedContest = null;
        },
        setContestStatus: (
            state,
            action: PayloadAction<{
                key: keyof ContestsState['statuses'];
                status: Status;
            }>,
        ) => {
            state.statuses[action.payload.key] = action.payload.status;
        },
    },
    extraReducers: (builder) => {
        // fetchContests
        builder.addCase(fetchContests.pending, (state) => {
            state.statuses.fetchList = 'loading';
            state.error = null;
        });
        builder.addCase(
            fetchContests.fulfilled,
            (state, action: PayloadAction<ContestsResponse>) => {
                state.statuses.fetchList = 'successful';
                state.contests = action.payload.contests;
                state.hasNextPage = action.payload.hasNextPage;
            },
        );
        builder.addCase(
            fetchContests.rejected,
            (state, action: PayloadAction<any>) => {
                state.statuses.fetchList = 'failed';
                state.error = action.payload;
            },
        );

        // fetchContestById
        builder.addCase(fetchContestById.pending, (state) => {
            state.statuses.fetchById = 'loading';
            state.error = null;
        });
        builder.addCase(
            fetchContestById.fulfilled,
            (state, action: PayloadAction<Contest>) => {
                state.statuses.fetchById = 'successful';
                state.selectedContest = action.payload;
            },
        );
        builder.addCase(
            fetchContestById.rejected,
            (state, action: PayloadAction<any>) => {
                state.statuses.fetchById = 'failed';
                state.error = action.payload;
            },
        );

        // createContest
        builder.addCase(createContest.pending, (state) => {
            state.statuses.create = 'loading';
            state.error = null;
        });
        builder.addCase(
            createContest.fulfilled,
            (state, action: PayloadAction<Contest>) => {
                state.statuses.create = 'successful';
                state.contests.unshift(action.payload);
            },
        );
        builder.addCase(
            createContest.rejected,
            (state, action: PayloadAction<any>) => {
                state.statuses.create = 'failed';
                state.error = action.payload;
            },
        );
    },
});

// =====================
// Экспорты
// =====================

export const { clearSelectedContest, setContestStatus } = contestsSlice.actions;
export const contestsReducer = contestsSlice.reducer;