import { HomeHeader } from "@/components/home-header";
import { LeagueModal } from "@/components/league-modal";
import { MatchCard } from "@/components/match-card";
import { SelectionModal } from "@/components/selection-modal";
import { CalendarModal } from "@/components/simple-calendar";
import { ThemedText } from "@/components/themed-text";
import { ThemedView } from "@/components/themed-view";
import { IconSymbol } from "@/components/ui/icon-symbol";
import { Colors } from "@/constants/theme";
import { useAppState } from "@/context/AppStateContext";
import { useTheme } from "@/context/ThemeContext";
import { fetchLeagues, fetchSports, fetchTodayMatches } from "@/lib/api";
import { League, Match, Sport } from "@/types/api";
import React, { useEffect, useMemo, useState } from "react";
import { useTranslation } from "react-i18next";
import {
  ActivityIndicator,
  FlatList,
  StyleSheet,
  TouchableOpacity,
  View,
} from "react-native";

export default function HomeScreen() {
  const { theme } = useTheme();
  const { t } = useTranslation();
  const isDark = theme === "dark";
  const iconColor = isDark ? Colors.dark.icon : Colors.light.icon;
  const filterBg = isDark ? "#2C2C2E" : "#F2F2F7";

  const { state, updateSportId, updateDate, updateLeagueKey, updateTimezone } =
    useAppState();

  const [sports, setSports] = useState<Sport[]>([]);
  const [leagues, setLeagues] = useState<League[]>([]);
  const [matches, setMatches] = useState<Match[]>([]);
  const [loading, setLoading] = useState(true);
  const [loadingLeagues, setLoadingLeagues] = useState(false);
  const [now, setNow] = useState(() => new Date());

  const deviceTimeZone = useMemo(() => {
    try {
      console.log(
        "deviceTimeZone",
        Intl.DateTimeFormat().resolvedOptions().timeZone
      );
      return Intl.DateTimeFormat().resolvedOptions().timeZone || "UTC";
    } catch {
      return "UTC";
    }
  }, []);

  // 初始化时同步设备时区到 Context
  useEffect(() => {
    updateTimezone(deviceTimeZone);
  }, [deviceTimeZone]);

  // Selection States - 从 Context 读取
  const selectedSportId = state.selectedSportId;
  const selectedDate = state.selectedDate;
  const selectedLeagueKey = state.selectedLeagueKey;
  const [filterMode, setFilterMode] = useState<"time" | "league">("time"); // 时间或联赛模式

  // Modal Visibilities
  const [showSportModal, setShowSportModal] = useState(false);
  const [showCalendarModal, setShowCalendarModal] = useState(false);
  const [showLeagueModal, setShowLeagueModal] = useState(false);

  // Load Sports and Leagues
  useEffect(() => {
    loadSports();
    loadLeagues();
  }, []);

  // 当前时间：每秒刷新（用于展示“现在时间/时区”）
  useEffect(() => {
    const id = setInterval(() => setNow(new Date()), 1000);
    return () => clearInterval(id);
  }, []);

  // Load Matches when sport or date changes
  useEffect(() => {
    if (selectedSportId !== null) {
      loadMatches(selectedSportId);
    }
  }, [selectedSportId, selectedDate]);

  const timezoneLabel = useMemo(() => {
    // 仅展示 UTC 偏移（不展示时区名）
    const offsetMin = -now.getTimezoneOffset();
    const sign = offsetMin >= 0 ? "+" : "-";
    const abs = Math.abs(offsetMin);
    const hh = String(Math.floor(abs / 60)).padStart(2, "0");
    const mm = String(abs % 60).padStart(2, "0");
    return `UTC${sign}${hh}`;
  }, [now]);

  const nowTimeText = useMemo(() => {
    const hh = String(now.getHours()).padStart(2, "0");
    const mm = String(now.getMinutes()).padStart(2, "0");
    const ss = String(now.getSeconds()).padStart(2, "0");
    return `${hh}:${mm}`;
  }, [now]);

  // Load Leagues when sport changes
  useEffect(() => {
    if (selectedSportId !== null) {
      loadLeagues();
    }
  }, [selectedSportId]);

  const loadSports = async () => {
    try {
      const apiList = await fetchSports();
      // 创建8个运动的完整列表
      const defaultSports: Sport[] = [
        {
          id: 1,
          name: "football",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 2,
          name: "basketball",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 3,
          name: "tennis",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 4,
          name: "cricket",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 5,
          name: "baseball",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 6,
          name: "badminton",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 7,
          name: "snooker",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 8,
          name: "volleyball",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
      ];

      // 合并API返回的运动和默认列表
      const sportsMap = new Map<number, Sport>();
      apiList.forEach((sport) => {
        sportsMap.set(sport.id, sport);
      });

      // 补充默认运动到8个
      defaultSports.forEach((sport) => {
        if (!sportsMap.has(sport.id)) {
          sportsMap.set(sport.id, sport);
        }
      });

      const allSports = Array.from(sportsMap.values())
        .sort((a, b) => a.id - b.id)
        .slice(0, 8);

      setSports(allSports);
    } catch (e) {
      console.error(e);
      // API失败时使用默认8个运动
      const defaultSports: Sport[] = [
        {
          id: 1,
          name: "football",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 2,
          name: "basketball",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 3,
          name: "tennis",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 4,
          name: "cricket",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 5,
          name: "baseball",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 6,
          name: "badminton",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 7,
          name: "snooker",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
        {
          id: 8,
          name: "volleyball",
          description: "",
          icon: "",
          isActive: true,
          updatedAt: "",
          createdAt: "",
        },
      ];
      setSports(defaultSports);
    }
  };

  // 加载联赛
  const loadLeagues = async () => {
    try {
      if (selectedSportId !== null) {
        setLoadingLeagues(true);
        const list = await fetchLeagues(selectedSportId, "");
        setLeagues(list);
      }
    } catch (e) {
      console.error(e);
    } finally {
      setLoadingLeagues(false);
    }
  };

  const loadMatches = async (sportId: number) => {
    setLoading(true);
    try {
      const list = await fetchTodayMatches(
        sportId,
        selectedDate,
        deviceTimeZone
      );
      setMatches(list);
    } catch (e) {
      console.error(e);
    } finally {
      setLoading(false);
    }
  };

  const currentSport = sports.find((s) => s.id === selectedSportId);

  // 获取当前运动的国际化名称
  const getSportName = (sport: Sport | undefined): string => {
    if (!sport) return t("home.select_sport");
    const sportKeyMap: { [key: number]: string } = {
      1: "football",
      2: "basketball",
      3: "tennis",
      4: "cricket",
      5: "baseball",
      6: "badminton",
      7: "snooker",
      8: "volleyball",
    };
    const sportKey = sportKeyMap[sport.id] || sport.name.toLowerCase();
    return t(`sports.${sportKey}`, { defaultValue: sport.name });
  };

  const handleLeagueSelect = (leagueKey: string) => {
    updateLeagueKey(leagueKey);
    console.log("Selected league:", leagueKey);
  };

  // 缓存运动选项，避免每次渲染都重新计算
  const sportOptions = useMemo(() => {
    return sports.map((s) => {
      const sportKeyMap: { [key: number]: string } = {
        1: "football",
        2: "basketball",
        3: "tennis",
        4: "cricket",
        5: "baseball",
        6: "badminton",
        7: "snooker",
        8: "volleyball",
      };
      const sportKey = sportKeyMap[s.id] || s.name.toLowerCase();
      return {
        id: s.id,
        label: s.name,
        value: s.id,
        icon: s.icon,
      };
    });
  }, [sports]);

  const renderHeader = () => (
    <View style={styles.filterContainer}>
      {/* Time/League Filter Toggle */}
      <TouchableOpacity
        style={[styles.filterBtn, { backgroundColor: filterBg }]}
        onPress={() => setFilterMode(filterMode === "time" ? "league" : "time")}
      >
        <IconSymbol
          name={filterMode === "time" ? "time-outline" : "trophy-outline"}
          size={18}
          color={iconColor}
        />
        <ThemedText style={styles.filterText}>
          {filterMode === "time" ? t("home.time") : t("home.league")}
        </ThemedText>
      </TouchableOpacity>

      {/* Sport Selector */}
      <TouchableOpacity
        style={[
          styles.filterBtn,
          styles.mainFilterBtn,
          { backgroundColor: filterBg },
        ]}
        onPress={() => setShowSportModal(true)}
      >
        <IconSymbol name="football-outline" size={18} color={iconColor} />
        <ThemedText style={styles.filterText}>
          {getSportName(currentSport)}
        </ThemedText>
      </TouchableOpacity>

      {/* Date/League Selector */}
      {filterMode === "time" ? (
        <TouchableOpacity
          style={[styles.filterBtn, { backgroundColor: filterBg }]}
          onPress={() => setShowCalendarModal(true)}
        >
          <ThemedText style={styles.dateDayText}>
            {selectedDate.getDate()}
          </ThemedText>
          <ThemedText style={styles.dateMonthText}>
            {timezoneLabel} {nowTimeText}
          </ThemedText>
        </TouchableOpacity>
      ) : (
        <TouchableOpacity
          style={[styles.filterBtn, { backgroundColor: filterBg }]}
          onPress={() => {
            // 立即显示弹窗
            setShowLeagueModal(true);
            // 如果联赛列表为空，立即设置loading状态并加载
            if (selectedSportId !== null) {
              if (leagues.length === 0) {
                setLoadingLeagues(true);
              }
              loadLeagues();
            }
          }}
        >
          <IconSymbol name="trophy-outline" size={18} color={iconColor} />
          <ThemedText style={styles.filterText} numberOfLines={1}>
            {selectedLeagueKey
              ? leagues.find((l) => l.key === selectedLeagueKey)?.name ||
                t("home.select_league")
              : t("home.select_league")}
          </ThemedText>
        </TouchableOpacity>
      )}
    </View>
  );

  return (
    <ThemedView style={styles.container}>
      <HomeHeader />

      {renderHeader()}

      {loading ? (
        <View style={styles.center}>
          <ActivityIndicator size="large" color={Colors[theme].tint} />
          <ThemedText style={{ marginTop: 10 }}>{t("home.loading")}</ThemedText>
        </View>
      ) : (
        <FlatList
          data={matches}
          keyExtractor={(item) => item.id}
          renderItem={({ item }) => <MatchCard match={item} />}
          contentContainerStyle={styles.listContent}
          ListEmptyComponent={
            <View style={styles.center}>
              <ThemedText>{t("home.no_matches")}</ThemedText>
            </View>
          }
        />
      )}

      {/* Modals - 条件渲染，只在可见时渲染 */}
      {showSportModal && (
        <SelectionModal
          visible={showSportModal}
          onClose={() => setShowSportModal(false)}
          title={t("home.select_sport")}
          options={sportOptions}
          selectedValue={selectedSportId}
          onSelect={updateSportId}
        />
      )}

      {showCalendarModal && (
        <CalendarModal
          visible={showCalendarModal}
          onClose={() => setShowCalendarModal(false)}
          selectedDate={selectedDate}
          onSelectDate={updateDate}
        />
      )}

      {showLeagueModal && (
        <LeagueModal
          visible={showLeagueModal}
          onClose={() => setShowLeagueModal(false)}
          leagues={leagues}
          selectedLeagueKey={selectedLeagueKey}
          loading={loadingLeagues}
          onSelect={handleLeagueSelect}
        />
      )}
    </ThemedView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  center: {
    flex: 1,
    justifyContent: "center",
    alignItems: "center",
    paddingTop: 50,
  },
  filterContainer: {
    flexDirection: "row",
    paddingHorizontal: 16,
    paddingVertical: 12,
    gap: 12,
  },
  filterBtn: {
    flex: 1,
    height: 44, // Increased from 36
    flexDirection: "column", // Stacked logic for Date, or Row for others
    justifyContent: "center",
    alignItems: "center",
    borderRadius: 8, // Rounded corners
    // iOS shadow
    shadowColor: "#000",
    shadowOffset: { width: 0, height: 1 },
    shadowOpacity: 0.1,
    shadowRadius: 2,
    // Android elevation
    elevation: 2,
  },
  mainFilterBtn: {
    flex: 2, // Wider for sport
    flexDirection: "row",
    gap: 8,
  },
  filterText: {
    fontSize: 14,
    fontWeight: "500",
  },
  dateDayText: {
    fontSize: 16,
    lineHeight: 16,
    fontWeight: "bold",
  },
  dateMonthText: {
    fontSize: 12,
    lineHeight: 12,
    opacity: 0.6,
  },
  listContent: {
    padding: 16,
    paddingTop: 8,
  },
});
