import { useState, useEffect, use } from "react";

import {

  StyleSheet,

  Text,

  View,

  ScrollView,

  Pressable,

  ActivityIndicator,

} from "react-native";

import { useLocalSearchParams, router, Stack } from "expo-router";

import { format } from "date-fns";

import { ptBR } from "date-fns/locale";

import { Card, SubtleInfoCard } from "@/components/ui/Cards";

import { NoLinkMessage } from "@/components/misc/NoLinkMessage";

import { Badge } from "@/components/ui/Badge";

import { Button } from "@/components/ui/Button";

import { Col, Between, Row } from "@/components/ui/LayoutHelpers";

import { Section, SectionHeader } from "@/components/ui/Sections";

import { Theme, Colors, Spacing } from "@/constants/theme";

import { getMood } from "@/constants/moods";

import {

  getMoodComponent,

  intensityLabel,

  intensityToValue,

} from "@/constants/mood-components";

import { useMoodEntry, useDeleteMoodEntry } from "@/hooks";

import { getTimeBadge, formatMoment } from "@/lib/utils/time";

import { MoodComponentCard } from "@/components/ui/MoodComponentCard";

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

import { getTriggerCategory } from "@/constants/trigger-categories";

const impactColor = (n: number) => {

  if (n <= 1) return '#86efac';

  if (n <= 2) return '#22c55e';

  if (n <= 3) return '#f59e0b';

  if (n <= 4) return '#f97316';

  return '#ef4444';

};

export default function MoodDetailScreen() {

  const { id } = useLocalSearchParams<{ id: string }>();

  const { data: entry, isLoading, isError } = useMoodEntry(id);

  const deleteMoodEntry = useDeleteMoodEntry();

  const [minutesLeft, setMinutesLeft] = useState(0);

  const [canDelete, setCanDelete] = useState(false);

  useEffect(() => {

    const updateTimer = () => {

      const moment = new Date(entry?.moment);

      const createdAt = new Date(entry?.moment);

      const msSinceCreation = Date.now() - createdAt.getTime();

      const deletionWindowMs = 5 * 60 * 1000;

      const newCanDelete = msSinceCreation < deletionWindowMs;

      const newMinutesLeft = Math.max(

        0,

        Math.ceil((deletionWindowMs - msSinceCreation) / 60000),

      );

      setCanDelete(newCanDelete);

      setMinutesLeft(newMinutesLeft);

    };

    updateTimer(); // Set initial values

    const interval = setInterval(updateTimer, 1000);

    return () => clearInterval(interval);

  }, [entry?.moment]);

  if (isLoading) {

    return (

      <View style={styles.centered}>

        <ActivityIndicator size="large" color={Theme.colors.tint} />

      </View>

    );

  }

  if (isError || !entry) {

    return (

      <View style={styles.centered}>

        <Text style={styles.errorText}>Registro não encontrado.</Text>

        <Pressable onPress={() => router.back()} style={styles.backButton}>

          <Text style={styles.backButtonText}>Voltar</Text>

        </Pressable>

      </View>

    );

  }

  const moment = new Date(entry.moment);

  const moodDef = getMood(entry.selectedMood.toLowerCase());

  const badge = getTimeBadge(moment);

  const handleDelete = async () => {

    await deleteMoodEntry.mutateAsync(String(entry.id));

    router.back();

  };

  const deleteButtonMsg = () => {

    const msg = "Excluir Registro";

    const timeLeftStr = `(Disponível por ${minutesLeft < 1 ? "<1" : minutesLeft}:00)`;

    const suffix = canDelete ? timeLeftStr : "(Expirado)";

    return `${msg} ${suffix}`;

  };

  return (

    <>

      <Stack.Screen options={{ title: "Ver detalhes" }} />

      <ScrollView

        style={styles.container}

        contentContainerStyle={styles.content}

        showsVerticalScrollIndicator={false}

      >

        {/* Header card */}

        <Card style={styles.headerCard}>

          <Between>

            <Row gap={12} style={{ alignItems: "center" }}>

              <Text style={styles.moodIcon}>{moodDef?.icon ?? "😐"}</Text>

              <Col gap={2}>

                <Text style={styles.moodLabel}>

                  {moodDef?.label ?? entry.selectedMood}

                </Text>

                <Text style={styles.moodTime}>{formatMoment(moment)}</Text>

              </Col>

            </Row>

            {/* If this is the latest mood entry, show the active badge */}

            <Badge

              label="Registro Ativo"

              backgroundColor={Theme.colors.activeBackground}

              color={Theme.colors.tint}

            />

          </Between>

        </Card>

        {/* Core levels */}

        <Section>

          <SectionHeader title="Níveis emocionais" variant="subtle" />

          {[

            { id: "energy", label: "Energia", value: entry.energyLevel },

            { id: "stress", label: "Estresse", value: entry.stressLevel },

            { id: "anxiety", label: "Ansiedade", value: entry.anxietyLevel },

          ].map((item, index, arr) => (

            <Card key={item.id} style={{ padding: Spacing.cardGap }}>

              <View key={item.label}>

                <View style={styles.componentRow}>

                  <Text style={styles.componentLabel}>{item.label}</Text>

                  <Text style={styles.componentIntensityGreen}>

                    {item.value}/10

                  </Text>

                </View>

                <View style={styles.progressTrack}>

                  <View

                    style={[

                      styles.progressFill,

                      { width: `${(item.value / 10) * 100}%` },

                    ]}

                  />

                </View>

              </View>

            </Card>

          ))}

        </Section>

        <Section>

          <SectionHeader title="Além disso, sinto..." variant="subtle" />

          <Col gap={0}>

            {entry.moodComponents.map((comp, index) => {

              const def = getMoodComponent(comp.component.toLowerCase());

              const numericIntensity =

                comp.intensity === "LIGHT"

                  ? 2

                  : comp.intensity === "MODERATE"

                    ? 5

                    : 8;

              return (

                <MoodComponentCard

                  key={comp.id}

                  id={comp.component.toLowerCase()}

                  intensity={comp.intensity}

                />

              );

            })}

          </Col>

        </Section>

        {/* Linked triggers */}

        <Section>

          <SectionHeader title="Vínculo" variant="subtle" />

          {entry.triggerLinks && entry.triggerLinks.length > 0 ? (

            <Col gap={8}>

              {entry.triggerLinks.map((link) => {

                const cat = getTriggerCategory(link.trigger.category);

                return (

                  <Pressable

                    key={link.id}

                    onPress={() => router.push(`/triggers/${link.trigger.id}`)}

                    style={({ pressed }) => [pressed && { opacity: 0.7 }]}

                  >

                    <Card style={styles.linkCard}>

                      <Row style={{ alignItems: "center", gap: 12 }}>

                        <View style={[styles.linkIconCircle, { backgroundColor: cat.iconBackground }]}>

                          <MaterialIcons name={cat.icon} size={22} color={cat.color} />

                        </View>

                        <Col gap={3} style={{ flex: 1 }}>

                          <Row style={{ alignItems: "center", gap: 6 }}>

                            <Text style={styles.linkLabel}>{cat.label}</Text>

                            <Badge label="Gatilho" variant="orange" style={undefined} />

                          </Row>

                          <Text style={styles.linkTime}>

                            {formatMoment(new Date(link.trigger.moment))}

                          </Text>

                        </Col>

                        <Ionicons name="chevron-forward" size={16} color={Colors.light.disabled} />

                      </Row>

                      <View style={styles.impactBar}>

                        <View

                          style={[

                            styles.impactFill,

                            {

                              width: `${(link.perceivedImpact / 5) * 100}%` as any,

                              backgroundColor: impactColor(link.perceivedImpact),

                            },

                          ]}

                        />

                      </View>

                    </Card>

                  </Pressable>

                );

              })}

            </Col>

          ) : (

            <NoLinkMessage />

          )}

        </Section>

        {/* Annotation / notes */}

        {entry.annotation && (

          <Section>

            <SectionHeader title="Anotações" variant="subtle" />

            <Card style={{ padding: Spacing.cardGap }}>

              <Text style={styles.annotation}>

                "{entry.annotation?.trim()}"

              </Text>

            </Card>

          </Section>

        )}

        {/* Delete */}

        <View style={styles.section}>

          <Text style={styles.sectionLabel}>GESTÃO DO REGISTRO</Text>

          <Button

            variant="danger"

            isLoading={deleteMoodEntry.isPending}

            disabled={!canDelete || deleteMoodEntry.isPending}

            onPress={handleDelete}

            title={deleteButtonMsg()}

          />

          <SubtleInfoCard

            style={styles.deleteInfo}

            text={`

              A exclusão de registros é permitida apenas nos primeiros 5 minutos

              após o envio para garantir a integridade do histórico emocional.

              `}

          />

        </View>

      </ScrollView>

    </>

  );

}

const styles = StyleSheet.create({

  container: {

    flex: 1,

    backgroundColor: Theme.colors.background,

  },

  content: {

    padding: Spacing.containerPadding,

    gap: Spacing.sectionGap,

    paddingBottom: 48,

  },

  centered: {

    flex: 1,

    justifyContent: "center",

    alignItems: "center",

    gap: 12,

  },

  errorText: {

    fontSize: 15,

    color: Colors.light.textSecondary,

  },

  backButton: {

    paddingHorizontal: 20,

    paddingVertical: 10,

    backgroundColor: Theme.colors.tint,

    borderRadius: Theme.borderRadius.md,

  },

  backButtonText: {

    fontWeight: "700",

    color: Theme.colors.text,

  },

  // Header

  headerCard: {

    padding: 16,

  },

  moodIcon: {

    fontSize: 40,

  },

  moodLabel: {

    fontSize: 17,

    fontWeight: "700",

    color: Colors.light.text,

  },

  moodTime: {

    fontSize: 13,

    color: Colors.light.textSecondary,

  },

  // Sections

  section: {

    gap: 8,

  },

  sectionLabel: {

    fontSize: 11,

    fontWeight: "600",

    letterSpacing: 0.8,

    color: Colors.light.textSecondary,

    textTransform: "uppercase",

  },

  // Components

  componentRow: {

    flexDirection: "row",

    justifyContent: "space-between",

    alignItems: "center",

    paddingVertical: 10,

  },

  componentLabel: {

    fontSize: 15,

    fontWeight: "700",

    color: Colors.light.text,

  },

  componentIntensity: {

    fontSize: 13,

    color: Colors.light.textSecondary,

  },

  componentIntensityGreen: {

    fontSize: 13,

    fontWeight: "700",

    color: Theme.colors.tint,

  },

  progressTrack: {

    height: 6,

    backgroundColor: Theme.colors.light.divider,

    borderRadius: Theme.borderRadius.full,

    marginBottom: 4,

    overflow: "hidden",

  },

  progressFill: {

    height: "100%",

    backgroundColor: Theme.colors.light.tint,

    borderRadius: Theme.borderRadius.full,

  },

  // Annotation

  annotation: {

    fontSize: 14,

    lineHeight: 22,

    color: Colors.light.textSecondary,

    fontStyle: "italic",

    padding: 4,

  },

  // Linked trigger cards

  linkCard: {

    padding: Spacing.cardGap,

    overflow: "hidden",

    gap: 10,

  },

  linkIconCircle: {

    width: 44,

    height: 44,

    borderRadius: 22,

    alignItems: "center",

    justifyContent: "center",

  },

  linkTime: {

    fontSize: 12,

    color: Colors.light.textSecondary,

  },

  linkLabel: {

    fontSize: 15,

    fontWeight: "700",

    color: Colors.light.text,

  },

  impactBar: {

    height: 3,

    backgroundColor: Colors.light.divider,

    borderRadius: 99,

    overflow: "hidden",

  },

  impactFill: {

    height: "100%",

    borderRadius: 99,

  },

});