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import api from "@/api/apiClient";
import apiClient from "@/api/apiClient";
import { createAsyncThunk, createSlice, PayloadAction } from "@reduxjs/toolkit";

export interface Chat {
  id: string;
  title: string;
  createdAt: string;
  lastUpdatedAt: string;
  chat: [];
  context: [];
  prompt?: "";
}

interface ChatsState {
  chats: Chat[];
  activeChat: string | null;
  searchQuery: string;
  creatingChat: boolean;
  error: string;
  chatsLoading: boolean;
}

const initialState: ChatsState = {
  chats: [],
  activeChat: null,
  searchQuery: "",
  creatingChat: false,
  error: null,
  chatsLoading: false,
};

interface createChatResponseType {
  success: boolean;
  sessionId: string;
  message: string;
}
interface getChatResponseType {
  success: boolean;
  chats: [];
  message: string;
}

export const createChat = createAsyncThunk(
  "chat/create-chat",
  async (sessionId: string, { rejectWithValue }) => {
    try {
      const response: createChatResponseType = await api.post(
        "/chat/create-chat",
        {
          sessionId,
        }
      );
      if (!response.success) {
        rejectWithValue("Error creating new chat.");
      }
      return response?.sessionId;
    } catch (error: any) {
      return rejectWithValue(
        error.response?.data?.message || "creating chat failed"
      );
    }
  }
);

export const renameChat = createAsyncThunk(
  "chat/rename-chat",
  async (data: { sessionId: string; title: string }, { rejectWithValue }) => {
    try {
      const response: createChatResponseType = await api.post(
        "/chat/rename-chat",
        data
      );
      if (!response.success) {
        rejectWithValue("Error creating new chat.");
      }
      // @ts-expect-error any
      return response?.rename;
    } catch (error: any) {
      return rejectWithValue(
        error.response?.data?.message || "creating chat failed"
      );
    }
  }
);
export const getChats = createAsyncThunk(
  "chat/get-chats",
  async (_, { rejectWithValue }) => {
    try {
      const response: getChatResponseType = await api.post("/chat/get-chats", {
        sessionId: "adakjn",
      });
      if (!response.success) {
        rejectWithValue("Error getting chats.");
      }
      return response?.chats;
    } catch (error: any) {
      return rejectWithValue(
        error.response?.data?.message || "getting chats failed"
      );
    }
  }
);

export const chatsSlice = createSlice({
  name: "chats",
  initialState,
  reducers: {
    setActiveChat: (state, action: PayloadAction<string>) => {
      state.activeChat = action.payload;
    },
    deleteChat: (state, action: PayloadAction<string>) => {
      const deletedIndex = state.chats.findIndex(
        (chat) => chat.id === action.payload
      );
      state.chats = state.chats.filter((chat) => chat.id !== action.payload);

      if (state.activeChat === action.payload) {
        if (state.chats.length > 0) {
          const newIndex = Math.min(deletedIndex, state.chats.length - 1);
          state.activeChat = state.chats[newIndex].id;
        } else {
          state.activeChat = null;
        }
      }
    },
    setSearchQuery: (state, action: PayloadAction<string>) => {
      state.searchQuery = action.payload;
    },
    updateChatTimestamp: (state, action: PayloadAction<string>) => {
      const chat = state.chats.find((c) => c.id === action.payload);
      if (chat) {
        chat.lastUpdatedAt = new Date().toISOString();
      }
    },
  },
  extraReducers: (builder) => {
    builder
      .addCase(createChat.pending, (state) => {
        state.creatingChat = true;
        state.error = null;
      })
      .addCase(createChat.fulfilled, (state, action: PayloadAction<string>) => {
        const newChatId = action.payload;
        const newChat = {
          id: newChatId,
          title: "New Chat",
          createdAt: new Date().toISOString(),
          lastUpdatedAt: new Date().toISOString(),
        };
        state.chats.unshift(newChat);
        state.activeChat = newChatId;
      })
      .addCase(createChat.rejected, (state, action) => {
        state.creatingChat = false;
        state.error = action.payload as string;
      })
      .addCase(getChats.pending, (state) => {
        state.chatsLoading = true;
        state.error = null;
      })
      .addCase(getChats.fulfilled, (state, action: PayloadAction<any>) => {
        state.chats = action.payload;
      })
      .addCase(getChats.rejected, (state, action) => {
        state.chatsLoading = false;
        state.error = action.payload as string;
      })
      .addCase(renameChat.pending, (state) => {
        state.chatsLoading = true;
        state.error = null;
      })
      .addCase(renameChat.fulfilled, (state, action: PayloadAction<any>) => {
        const chat = state.chats.find((c) => c.id === action.payload.id);
        if (chat) {
          chat.title = action.payload.title;
          chat.lastUpdatedAt = new Date().toISOString();
        }
      })
      .addCase(renameChat.rejected, (state, action) => {
        state.chatsLoading = false;
        state.error = action.payload as string;
      });
  },
});

export const {
  setActiveChat,
  deleteChat,
  setSearchQuery,
  updateChatTimestamp,
} = chatsSlice.actions;

export default chatsSlice.reducer;