import { View, Text, TouchableOpacity, StyleSheet, ActivityIndicator } from "react-native";

import { Ionicons } from "@expo/vector-icons";

import { Colors, Typography, Spacing, BorderRadius, Shadows } from "@/constants/theme";

import { useMedicineToday, useCreateCareAction, medicineTodayKeys } from "@/hooks";

import { useQueryClient } from "@tanstack/react-query";

import { TodayMedicineEntry } from "@/lib/api";

function sortedTimes(scheduledAt: string[]): string[] {

  return [...scheduledAt].sort((a, b) => {

    const [ah, am] = a.split(":").map(Number);

    const [bh, bm] = b.split(":").map(Number);

    return ah * 60 + am - (bh * 60 + bm);

  });

}

function confirmedIndexes(entry: TodayMedicineEntry): Set<number> {

  const confirmed = new Set<number>();

  const n = Math.min(entry.logs.length, entry.regimen.scheduledAt.length);

  for (let i = 0; i < n; i++) confirmed.add(i);

  return confirmed;

}

export function TodayMedicines() {

  const { data, isLoading } = useMedicineToday();

  const createCareAction = useCreateCareAction();

  const queryClient = useQueryClient();

  if (isLoading) {

    return (

      <View style={styles.center}>

        <ActivityIndicator color={Colors.light.tint} />

      </View>

    );

  }

  const entries = data?.regimens ?? [];

  if (entries.length === 0) {

    return (

      <View style={styles.empty}>

        <Text style={styles.emptyText}>Nenhum medicamento agendado para hoje</Text>

      </View>

    );

  }

  const handleConfirm = async (regimenId: number) => {

    await createCareAction.mutateAsync({

      type: "MEDICINE",

      moment: new Date(),

      regimenId,

    });

    queryClient.invalidateQueries({ queryKey: medicineTodayKeys.list() });

  };

  return (

    <View style={styles.container}>

      {entries.map((entry) => {

        const times = entry.regimen.scheduledAt.length > 0

          ? sortedTimes(entry.regimen.scheduledAt)

          : ["hoje"];

        const confirmed = confirmedIndexes(entry);

        return (

          <View key={entry.regimen.id} style={styles.card}>

            <View style={styles.cardHeader}>

              <View style={styles.iconWrap}>

                <Ionicons name="bandage-outline" size={18} color={Colors.light.tint} />

              </View>

              <View style={styles.cardInfo}>

                <Text style={styles.name}>{entry.regimen.name}</Text>

                <Text style={styles.dosage}>{entry.regimen.dosage}</Text>

              </View>

            </View>

            {times.map((time, idx) => {

              const isDone = time === "hoje" ? entry.logs.length > 0 : confirmed.has(idx);

              return (

                <TouchableOpacity

                  key={time}

                  style={[styles.timeRow, isDone && styles.timeRowConfirmed]}

                  onPress={isDone ? undefined : () => handleConfirm(entry.regimen.id)}

                  activeOpacity={isDone ? 1 : 0.7}

                  disabled={isDone || createCareAction.isPending}

                >

                  <Text style={[styles.timeText, isDone && styles.timeTextConfirmed]}>

                    {time === "hoje" ? "Hoje" : time}

                  </Text>

                  {isDone ? (

                    <Ionicons name="checkmark-circle" size={20} color="#34C759" />

                  ) : (

                    <View style={styles.pendingCircle} />

                  )}

                </TouchableOpacity>

              );

            })}

          </View>

        );

      })}

    </View>

  );

}

const styles = StyleSheet.create({

  container: { gap: Spacing.cardGap },

  center: { padding: Spacing.cardGap, alignItems: "center" },

  empty: { padding: Spacing.cardGap },

  emptyText: { ...Typography.bodyMd, color: Colors.light.textSecondary },

  card: {

    backgroundColor: "#fff",

    borderRadius: BorderRadius.lg,

    padding: Spacing.cardGap,

    gap: 10,

    ...Shadows.sm,

  },

  cardHeader: { flexDirection: "row", alignItems: "center", gap: 10 },

  iconWrap: {

    width: 32,

    height: 32,

    borderRadius: BorderRadius.md,

    backgroundColor: Colors.light.tint + "1A",

    alignItems: "center",

    justifyContent: "center",

  },

  cardInfo: { flex: 1 },

  name: { ...Typography.bodyMd, fontWeight: "600" },

  dosage: { ...Typography.labelSm, color: Colors.light.textSecondary },

  timeRow: {

    flexDirection: "row",

    alignItems: "center",

    justifyContent: "space-between",

    paddingVertical: 8,

    paddingHorizontal: 12,

    borderRadius: BorderRadius.md,

    backgroundColor: Colors.light.background,

  },

  timeRowConfirmed: { backgroundColor: "#F0FFF4", opacity: 0.8 },

  timeText: { ...Typography.bodyMd, fontWeight: "500" },

  timeTextConfirmed: { color: Colors.light.textSecondary },

  pendingCircle: {

    width: 20,

    height: 20,

    borderRadius: 10,

    borderWidth: 2,

    borderColor: Colors.light.divider,

  },

});