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

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

export interface Mission {
    id: number;
    authorId: number;
    name: string;
    difficulty: number;
    tags: string[];
    createdAt: string;
    updatedAt: string;
    timeLimitMilliseconds: number;
    memoryLimitBytes: number;
    statements: null;
}

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 {
    fetchContests: {
        contests: Contest[];
        hasNextPage: boolean;
        status: Status;
        error: string | null;
    };
    fetchContestById: {
        contest: Contest | null;
        status: Status;
        error: string | null;
    };
    createContest: {
        contest: Contest | null;
        status: Status;
        error: string | null;
    };
    fetchMyContests: {
        contests: Contest[];
        status: Status;
        error: string | null;
    };
    fetchRegisteredContests: {
        contests: Contest[];
        hasNextPage: boolean;
        status: Status;
        error: string | null;
    };
}

const initialState: ContestsState = {
    fetchContests: {
        contests: [],
        hasNextPage: false,
        status: 'idle',
        error: null,
    },
    fetchContestById: {
        contest: null,
        status: 'idle',
        error: null,
    },
    createContest: {
        contest: null,
        status: 'idle',
        error: null,
    },
    fetchMyContests: {
        contests: [],
        status: 'idle',
        error: null,
    },
    fetchRegisteredContests: {
        contests: [],
        hasNextPage: false,
        status: 'idle',
        error: null,
    },
};

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

// Все контесты
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',
            );
        }
    },
);

// Контест по ID
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',
            );
        }
    },
);

// Создание контеста
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',
            );
        }
    },
);

// Контесты, созданные мной
export const fetchMyContests = createAsyncThunk(
    'contests/fetchMyContests',
    async (_, { rejectWithValue }) => {
        try {
            const response = await axios.get<Contest[]>('/contests/my');
            // Возвращаем просто массив контестов
            return response.data;
        } catch (err: any) {
            return rejectWithValue(
                err.response?.data?.message || 'Failed to fetch my contests',
            );
        }
    },
);

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

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

const contestsSlice = createSlice({
    name: 'contests',
    initialState,
    reducers: {
        clearSelectedContest: (state) => {
            state.fetchContestById.contest = null;
        },
    },
    extraReducers: (builder) => {
        // fetchContests
        builder.addCase(fetchContests.pending, (state) => {
            state.fetchContests.status = 'loading';
            state.fetchContests.error = null;
        });
        builder.addCase(
            fetchContests.fulfilled,
            (state, action: PayloadAction<ContestsResponse>) => {
                state.fetchContests.status = 'successful';
                state.fetchContests.contests = action.payload.contests;
                state.fetchContests.hasNextPage = action.payload.hasNextPage;
            },
        );
        builder.addCase(fetchContests.rejected, (state, action: any) => {
            state.fetchContests.status = 'failed';
            state.fetchContests.error = action.payload;
        });

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

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

        // fetchMyContests
        // fetchMyContests
        builder.addCase(fetchMyContests.pending, (state) => {
            state.fetchMyContests.status = 'loading';
            state.fetchMyContests.error = null;
        });
        builder.addCase(
            fetchMyContests.fulfilled,
            (state, action: PayloadAction<Contest[]>) => {
                state.fetchMyContests.status = 'successful';
                state.fetchMyContests.contests = action.payload;
            },
        );
        builder.addCase(fetchMyContests.rejected, (state, action: any) => {
            state.fetchMyContests.status = 'failed';
            state.fetchMyContests.error = action.payload;
        });

        // fetchRegisteredContests
        builder.addCase(fetchRegisteredContests.pending, (state) => {
            state.fetchRegisteredContests.status = 'loading';
            state.fetchRegisteredContests.error = null;
        });
        builder.addCase(
            fetchRegisteredContests.fulfilled,
            (state, action: PayloadAction<ContestsResponse>) => {
                state.fetchRegisteredContests.status = 'successful';
                state.fetchRegisteredContests.contests =
                    action.payload.contests;
                state.fetchRegisteredContests.hasNextPage =
                    action.payload.hasNextPage;
            },
        );
        builder.addCase(
            fetchRegisteredContests.rejected,
            (state, action: any) => {
                state.fetchRegisteredContests.status = 'failed';
                state.fetchRegisteredContests.error = action.payload;
            },
        );
    },
});

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

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