import React, { useCallback, useEffect, useMemo, useState } from 'react';
import {
  ActivityIndicator,
  Alert,
  StatusBar,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';
import { NavigationContainer } from '@react-navigation/native';
import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
import { Ionicons } from '@expo/vector-icons';
import { orderBoxApi } from './api';
import { theme } from './theme';
import { OrderBoxState } from './types';
import { CardsScreen, HistoryScreen } from './kits/motion_reminder';

const Tab = createBottomTabNavigator();

type ScreenMode = 'hub' | 'motion_reminder';

const HubScreen = ({
  onEnterMotionReminder,
  loading,
}: {
  onEnterMotionReminder: () => void;
  loading: boolean;
}) => (
  <View style={styles.hubContainer}>
    <StatusBar barStyle="light-content" backgroundColor={theme.colors.background} />
    <View style={styles.hubHeader}>
      <Text style={styles.hubTitle}>框子</Text>
      <Text style={styles.hubSubtitle}>kit 聚合壳。当前阶段先落地第一个工具：运动提醒宝。</Text>
    </View>

    <TouchableOpacity style={styles.kitCard} disabled={loading} onPress={onEnterMotionReminder}>
      <View style={styles.kitCardIcon}>
        <Ionicons name="barbell-outline" size={28} color={theme.colors.primary} />
      </View>
      <View style={styles.kitCardBody}>
        <Text style={styles.kitCardTitle}>运动提醒宝</Text>
        <Text style={styles.kitCardText}>流程卡片、自动切步、语音播报、大字倒计时、下一个动作常驻显示。</Text>
      </View>
      <Ionicons name="chevron-forward" size={24} color={theme.colors.textSecondary} />
    </TouchableOpacity>
  </View>
);

function MotionReminderKit({ onExit }: { onExit: () => void }) {
  const [serverState, setServerState] = useState<OrderBoxState | null>(null);
  const [loading, setLoading] = useState(true);

  const refreshData = useCallback(async () => {
    try {
      const nextState = await orderBoxApi.getState();
      setServerState(nextState);
    } catch (error) {
      const message = error instanceof Error ? error.message : '加载失败';
      Alert.alert('加载失败', message);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    void refreshData();
  }, [refreshData]);

  return (
    <NavigationContainer independent>
      <Tab.Navigator
        screenOptions={{
          headerStyle: { backgroundColor: theme.colors.background },
          headerTintColor: theme.colors.text,
          tabBarStyle: { backgroundColor: theme.colors.surface, borderTopColor: theme.colors.border },
          tabBarActiveTintColor: theme.colors.primary,
          tabBarInactiveTintColor: theme.colors.textSecondary,
        }}
      >
        <Tab.Screen
          name="Cards"
          children={() => <CardsScreen onExit={onExit} serverState={serverState} onRefresh={refreshData} />}
          options={{
            title: '运动提醒宝',
            tabBarLabel: '卡片',
            tabBarIcon: ({ color, size }) => <Ionicons name="albums-outline" size={size} color={color} />,
          }}
        />
        <Tab.Screen
          name="History"
          children={() => <HistoryScreen onRefresh={refreshData} />}
          options={{
            title: '执行历史',
            tabBarLabel: '历史',
            tabBarIcon: ({ color, size }) => <Ionicons name="time-outline" size={size} color={color} />,
          }}
        />
      </Tab.Navigator>
    </NavigationContainer>
  );
}

export default function App() {
  const [screenMode, setScreenMode] = useState<ScreenMode>('hub');
  const [loading, setLoading] = useState(true);

  const initialize = useCallback(async () => {
    try {
      await orderBoxApi.getMeta();
      const state = await orderBoxApi.getState();
      if (state.activeKit === 'motion_reminder') {
        setScreenMode('motion_reminder');
      }
    } catch (error) {
      const message = error instanceof Error ? error.message : '初始化失败';
      Alert.alert('初始化失败', message);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    void initialize();
  }, [initialize]);

  const enterMotionReminder = async () => {
    try {
      setLoading(true);
      await orderBoxApi.setActiveKit('motion_reminder');
      setScreenMode('motion_reminder');
    } catch (error) {
      const message = error instanceof Error ? error.message : '进入失败';
      Alert.alert('进入失败', message);
    } finally {
      setLoading(false);
    }
  };

  const content = useMemo(() => {
    if (screenMode === 'motion_reminder') {
      return <MotionReminderKit onExit={() => setScreenMode('hub')} />;
    }
    return <HubScreen loading={loading} onEnterMotionReminder={() => void enterMotionReminder()} />;
  }, [loading, screenMode]);

  return <View style={styles.appContainer}>{content}</View>;
}

const styles = StyleSheet.create({
  appContainer: {
    flex: 1,
    backgroundColor: theme.colors.background,
  },
  hubContainer: {
    flex: 1,
    backgroundColor: theme.colors.background,
    padding: theme.spacing.lg,
    paddingTop: 72,
  },
  hubHeader: {
    marginBottom: theme.spacing.xl,
  },
  hubTitle: {
    ...theme.typography.h1,
    color: theme.colors.text,
    marginBottom: theme.spacing.sm,
  },
  hubSubtitle: {
    ...theme.typography.body,
    color: theme.colors.textSecondary,
    lineHeight: 24,
  },
  kitCard: {
    flexDirection: 'row',
    alignItems: 'center',
    backgroundColor: theme.colors.surface,
    borderRadius: theme.borderRadius.xl,
    padding: theme.spacing.lg,
    borderWidth: 1,
    borderColor: theme.colors.border,
    gap: theme.spacing.md,
  },
  kitCardIcon: {
    width: 56,
    height: 56,
    borderRadius: 28,
    backgroundColor: theme.colors.primarySoft,
    justifyContent: 'center',
    alignItems: 'center',
  },
  kitCardBody: {
    flex: 1,
  },
  kitCardTitle: {
    ...theme.typography.h3,
    color: theme.colors.text,
    marginBottom: theme.spacing.xs,
  },
  kitCardText: {
    ...theme.typography.bodySmall,
    color: theme.colors.textSecondary,
    lineHeight: 20,
  },
});