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

export interface OpenTab {
  id: string;
  label: string;
  screen: string;
  closable?: boolean;
  meta?: Record<string, unknown>;
}

interface TabsState {
  tabs: OpenTab[];
  activeTabId: string;
}

const initialState: TabsState = {
  tabs: [{ id: "home", label: "主页", screen: "home", closable: false }],
  activeTabId: "home",
};

const slice = createSlice({
  name: "tabs",
  initialState,
  reducers: {
    openTab(state, action: PayloadAction<OpenTab>) {
      const exists = state.tabs.find((t) => t.id === action.payload.id);
      if (!exists) state.tabs.push(action.payload);
      state.activeTabId = action.payload.id;
    },
    closeTab(state, action: PayloadAction<string>) {
      const id = action.payload;
      const idx = state.tabs.findIndex((t) => t.id === id);
      if (idx < 0) return;
      const tab = state.tabs[idx];
      if (tab.closable === false) return;
      state.tabs = state.tabs.filter((t) => t.id !== id);
      if (state.activeTabId === id) {
        const fallback = state.tabs[Math.max(0, idx - 1)] || state.tabs[0];
        state.activeTabId = fallback?.id ?? "home";
      }
    },
    setActiveTab(state, action: PayloadAction<string>) {
      state.activeTabId = action.payload;
    },
    resetTabs(state) {
      state.tabs = [{ id: "home", label: "主页", screen: "home", closable: false }];
      state.activeTabId = "home";
    },
  },
});

export const { openTab, closeTab, setActiveTab, resetTabs } = slice.actions;
export default slice.reducer;