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

import api from '@/lib/axios';
import { handleToastError } from '@/lib/utils';
import { toast } from 'sonner';
import messages from '../../../messages/en.json';

// Department interface
export interface Department {
    id: number;
    name: string;
    description: string;
    teamMembersCount: number;
}

// State interface
interface DepartmentsState {
    items: Department[];
    status: 'idle' | 'loading' | 'succeeded' | 'failed';
    error: string | null;
    selectedDepartment: Department | null;
    dropdownItems: Department[] | null;
    dropdownStatus: 'idle' | 'loading' | 'succeeded' | 'failed';
    token: string | null;
    totalCount: number;
    filters: {
        search?: { [key: string]: string };
        sortBy?: string;
        sortOrder?: 'ASC' | 'DESC';
    };
}

// Initial state
const initialState: DepartmentsState = {
    items: [],
    status: 'idle',
    error: null,
    selectedDepartment: null,
    dropdownItems: null,
    dropdownStatus: 'idle',
    token: null,
    totalCount: 0,
    filters: {
        search: {},
        sortBy: '',
        sortOrder: 'ASC',
    },
};

// Async Thunks
export const fetchDepartments = createAsyncThunk(
    'departments/fetchDepartments',
    async (pagination: { skip?: number; limit?: number } = {}, { getState, rejectWithValue }) => {
        try {
            const state = getState() as { departments: DepartmentsState };

            const { search, sortBy, sortOrder } = state?.departments?.filters;
            const limit = pagination.limit || 10;
            const skip = pagination.skip || 0;

            // Build query parameters object
            const params = {
                limit,
                skip,
                ...(sortBy && { sortBy }),
                ...(sortOrder && { sortOrder }),
                ...(search && typeof search === 'object' && search.name ? { search: search.name } : {}),
                ...(search && typeof search === 'string' ? { search } : {}),
            };

            // Convert params object to URL query string
            const queryParams = new URLSearchParams();
            Object.entries(params).forEach(([key, value]) => {
                if (value !== undefined) {
                    queryParams.append(key, value.toString());
                }
            });

            const response = await api.get(`/department/list?${queryParams.toString()}`);
            return response.data;
        } catch (error) {
            return rejectWithValue(error instanceof Error ? error.message : 'Failed to fetch departments');
        }
    },
);

export const getDepartmentDropdown = createAsyncThunk('departments/getDepartmentDropdown', async (_, { rejectWithValue }) => {
    try {
        const response = await api.get(`/department/dropdown`);
        return response.data;
    } catch (error) {
        return rejectWithValue(error instanceof Error ? error.message : 'Failed to fetch department dropdown');
    }
});

export const createDepartment = createAsyncThunk(
    'departments/createDepartment',
    async (departmentData: Partial<Department>, { rejectWithValue }) => {
        try {
            const response = await api.post(`/department/create`, departmentData);

            // handleToastError(response);

            return response;
        } catch (error: any) {
            handleToastError(error?.response);

            return rejectWithValue(error);
        }
    },
);

export const getDepartmentById = createAsyncThunk('departments/getDepartmentById', async (id: number, { rejectWithValue }) => {
    try {
        const response = await api.get(`/department/list/${id}`);
        return response.data;
    } catch (error) {
        return rejectWithValue(error instanceof Error ? error.message : 'Failed to fetch department details');
    }
});

export const updateDepartment = createAsyncThunk(
    'departments/updateDepartment',
    async ({ id, ...departmentData }: { id: number } & Partial<Department>, { rejectWithValue }) => {
        try {
            const response = await api.put(`/department/update/${id}`, departmentData);
            // handleToastError(response);
            return response.data;
        } catch (error: any) {
            handleToastError(error?.response);

            return rejectWithValue(error);
        }
    },
);

export const deleteDepartment = createAsyncThunk('departments/deleteDepartment', async (id: number, { rejectWithValue }) => {
    try {
        const response = await api.delete(`/department/delete/${id}`);

        if (response?.data?.success === false) {
            return rejectWithValue(response.data.message || 'Failed to delete department');
        }

        toast.success(messages.toasts.success.department_deleted);
        return id;
    } catch (error: any) {
        const message = error?.response?.data?.message || error.message || 'Failed to delete department';
        return rejectWithValue(message);
    }
});

// Create the slice
const departmentsSlice = createSlice({
    name: 'departments',
    initialState,
    reducers: {
        setSelectedDepartment: (state, action: PayloadAction<Department | null>) => {
            state.selectedDepartment = action.payload;
        },
        updateFilters: (state, action: PayloadAction<Partial<DepartmentsState['filters']>>) => {
            state.filters = { ...state.filters, ...action.payload };
        },
        resetFilters: (state) => {
            state.filters = initialState.filters;
        },
        // Modify setAuthToken to work with the new token management
        setAuthToken: (state, action: PayloadAction<string | null>) => {
            state.token = action.payload;

            // Only interact with localStorage on the client side
            if (typeof window !== 'undefined') {
                if (action.payload) {
                    localStorage.setItem('token', action.payload);
                } else {
                    localStorage.removeItem('token');
                }
            }
        },
    },
    extraReducers: (builder) => {
        builder
            .addCase(fetchDepartments.pending, (state) => {
                state.status = 'loading';
            })
            .addCase(fetchDepartments.fulfilled, (state, action) => {
                state.status = 'succeeded';
                state.items = action?.payload;
                // state.totalCount = action?.payload.totalCount;
            })
            .addCase(fetchDepartments.rejected, (state, action) => {
                state.status = 'failed';
                state.error = action.payload as string;
            })
            .addCase(createDepartment.pending, (state) => {
                state.loading = true;
                state.error = null;
            })
            .addCase(createDepartment.fulfilled, (state, action) => {
                state.loading = false;
            })
            .addCase(createDepartment.rejected, (state, action) => {
                state.loading = false;
                state.error = action.payload as string;
            })
            .addCase(updateDepartment.fulfilled, (state, action) => {
                // // Safely update a single department
                // const index = state.items.findIndex(dept => dept.id === action.payload.id);
                // if (index !== -1) {
                //   state.items[index] = action.payload;
                // }
            })
            .addCase(getDepartmentById.pending, (state) => {
                state.status = 'loading';
            })
            .addCase(getDepartmentById.fulfilled, (state, action) => {
                state.status = 'succeeded';
                state.selectedDepartment = action.payload;
            })
            .addCase(getDepartmentById.rejected, (state, action) => {
                state.status = 'failed';
                state.error = action.payload as string;
                state.selectedDepartment = null;
            })
            .addCase(deleteDepartment.pending, (state) => {
                state.status = 'loading';
            })
            .addCase(deleteDepartment.fulfilled, (state, action) => {
                state.status = 'succeeded';

                // Safely handle different data structures
                if (state.items?.data?.data) {
                    state.items.data.data = state.items.data.data.filter((dept) => dept.id !== action.payload);

                    // Optionally, update the total count
                    if (state.items.data.count > 0) {
                        state.items.data.count -= 1;
                    }
                } else if (Array.isArray(state.items)) {
                    // Fallback if items is a direct array
                    state.items = state.items.filter((dept) => dept.id !== action.payload);
                }
            })
            .addCase(deleteDepartment.rejected, (state, action) => {
                state.status = 'failed';
                state.error = action.payload as string;
            })
            .addCase(getDepartmentDropdown.pending, (state) => {
                state.status = 'loading';
                state.error = null;
            })
            .addCase(getDepartmentDropdown.fulfilled, (state, action) => {
                state.status = 'succeeded';
                state.dropdownItems = action.payload;
            })
            .addCase(getDepartmentDropdown.rejected, (state, action) => {
                state.status = 'failed';
                state.error = action.payload as string;
            });
    },
});

// Export actions
export const { setSelectedDepartment, updateFilters, resetFilters, setAuthToken } = departmentsSlice.actions;

export default departmentsSlice.reducer;