import { createSlice, createAsyncThunk } from "@reduxjs/toolkit";
import { ThunkSuccess, ThunkError, IUserResponse } from "../types";
import { IEditUserForm } from "../../features/UserRoles/User.interfaces";
import { RootState } from "../store";

interface UserState {
  status: "idle" | "loading" | "succeeded" | "failed";
  error: string | null;
  message: string;
  addedUser: IUserResponse | null;
  editedUser: IUserResponse | null;
}

const initialState: UserState = {
  status: "idle",
  error: null,
  message: "",
  addedUser: null,
  editedUser: null,
};

// ---------------- Add User ----------------
export const addUser = createAsyncThunk<
  ThunkSuccess<{ user: IUserResponse; success: boolean }>,
  IEditUserForm,
  { rejectValue: ThunkError; state: RootState }
>("user/addUser", async (userData, { rejectWithValue, getState }) => {
  try {
    const state = getState();
    const currentUserId = state.auth.user?.id;
    console.log("[DEBUG] [ADD-USER] [currentUserId]: ", currentUserId);
    const res = await fetch("/api/auth/register", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ ...userData, creator: currentUserId || "" }),
    });

    const data = await res.json();

    console.log("[DEBUG] [ADD-USER] [data]: ", data);

    if (!res.ok) {
      return rejectWithValue(data.message || "Failed to create user");
    }

    return {
      success: data.success,
      message: data.message || "User created successfully",
      user: data.user,
    } as ThunkSuccess<{ user: IUserResponse; success: boolean }>;
  } catch (err: unknown) {
    return rejectWithValue(
      (err as Error).message || "Network error during user creation"
    );
  }
});

// ---------------- Edit User ----------------
export const editUser = createAsyncThunk<
  ThunkSuccess<{ user: IUserResponse }>,
  { id: string; updates: Partial<IUserResponse> },
  { rejectValue: ThunkError }
>("user/editUser", async ({ id, updates }, { rejectWithValue }) => {
  try {
    const res = await fetch(`/api/dashboard/admin/users/${id}`, {
      method: "PATCH",
      headers: {
        "Content-Type": "application/json",
      },
      body: JSON.stringify(updates),
    });

    const data = await res.json();

    if (!res.ok) {
      return rejectWithValue(data.message || "Failed to update user");
    }

    return {
      message: data.message || "User updated successfully",
      user: data.user,
    };
  } catch (err: unknown) {
    return rejectWithValue(
      (err as Error).message || "Network error during user update"
    );
  }
});

// ---------------- Delete User ----------------
export const deleteUser = createAsyncThunk<
  ThunkSuccess<{ id: string }>,
  string,
  { rejectValue: ThunkError }
>("user/deleteUser", async (id, { rejectWithValue }) => {
  try {
    const res = await fetch(`/api/dashboard/admin/users/${id}`, {
      method: "DELETE",
      headers: {
        "Content-Type": "application/json",
      },
    });

    const data = await res.json();

    if (!res.ok) {
      return rejectWithValue(data.message || "Failed to delete user");
    }

    return {
      message: data.message || "User deleted successfully",
      id,
    };
  } catch (err: unknown) {
    return rejectWithValue(
      (err as Error).message || "Network error during user deletion"
    );
  }
});

// ---------------- Slice ----------------
const userSlice = createSlice({
  name: "user",
  initialState,
  reducers: {
    clearMessage: state => {
      state.message = "";
    },
    clearAddedUser: state => {
      state.addedUser = null;
    },
    clearEditedUser: state => {
      state.editedUser = null;
    },
    clearError: state => {
      state.error = null;
    },
  },
  extraReducers: builder => {
    builder
      // Add User
      .addCase(addUser.pending, state => {
        state.status = "loading";
        state.message = "Creating user...";
        state.addedUser = null;
        state.error = null;
      })
      .addCase(addUser.fulfilled, (state, action) => {
        state.status = "succeeded";
        state.message = action.payload.message;
        state.addedUser = action.payload.user;
        state.error = null;
      })
      .addCase(addUser.rejected, (state, action) => {
        state.status = "failed";
        state.error = action.payload as string;
        state.message = action.payload as string;
        state.addedUser = null;
      })
      // Edit User
      .addCase(editUser.pending, state => {
        state.status = "loading";
        state.message = "Updating user...";
        state.editedUser = null;
        state.error = null;
      })
      .addCase(editUser.fulfilled, (state, action) => {
        state.status = "succeeded";
        state.message = action.payload.message;
        state.editedUser = action.payload.user;
        state.error = null;
      })
      .addCase(editUser.rejected, (state, action) => {
        state.status = "failed";
        state.error = action.payload as string;
        state.message = action.payload as string;
        state.editedUser = null;
      })
      // Delete User
      .addCase(deleteUser.pending, state => {
        state.status = "loading";
        state.message = "Deleting user...";
        state.error = null;
      })
      .addCase(deleteUser.fulfilled, (state, action) => {
        state.status = "succeeded";
        state.message = action.payload.message;
        state.error = null;
      })
      .addCase(deleteUser.rejected, (state, action) => {
        state.status = "failed";
        state.error = action.payload as string;
        state.message = action.payload as string;
      });
  },
});

export const { clearMessage, clearAddedUser, clearEditedUser, clearError } =
  userSlice.actions;
export default userSlice.reducer;