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, Typography, Colors, Spacing } from "@/constants/theme";

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

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

import {

  useTrigger,

  useDeleteTrigger,

} from "@/hooks/useTrigger.queries";

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

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

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 TriggerDetailsScreen() {

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

  const { data: trigger, isLoading, isError } = useTrigger(id);

  const deleteTrigger = useDeleteTrigger();

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

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

  useEffect(() => {

    const updateTimer = () => {

      const createdAt = new Date(trigger?.createdAt);

      if (!createdAt) return;

      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);

    };

    if (isLoading) return;

    updateTimer(); // Set initial values

    const interval = setInterval(updateTimer, 1000);

    return () => clearInterval(interval);

  }, [trigger, isLoading]);

  if (isLoading) {

    return (

      <View style={styles.centered}>

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

      </View>

    );

  }

  if (isError || !trigger) {

    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 meta = getTriggerCategory(trigger.category);

  const handleDelete = async () => {

    await deleteTrigger.mutateAsync(String(trigger.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}>

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

            <View style={[styles.iconWrap, { backgroundColor: meta.iconBackground }]}>

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

            </View>

            <Col gap={2}>

              <Text style={styles.triggerLabel}>

                {meta.label}

              </Text>

              <Text style={styles.triggerMoment}>

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

              </Text>

            </Col>

          </Row>

        </Card>

        {/* Linked moods */}

        <Section>

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

          {trigger.moodLinks && trigger.moodLinks.length > 0 ? (

            <Col gap={8}>

              {trigger.moodLinks.map((link) => {

                const moodDef = getMood(link.mood.selectedMood.toLowerCase());

                return (

                  <Pressable

                    key={link.id}

                    onPress={() => router.push(`/entry/${link.mood.id}`)}

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

                  >

                    <Card style={styles.linkCard}>

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

                        <View style={styles.linkIconCircle}>

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

                        </View>

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

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

                            <Text style={styles.linkLabel}>

                              {moodDef?.label ?? link.mood.selectedMood}

                            </Text>

                            <Badge

                              label="Humor"

                              variant="yellow"

                              style={undefined}

                            />

                          </Row>

                          <Text style={styles.linkTime}>

                            {formatMoment(new Date(link.mood.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}%`,

                              backgroundColor: impactColor(link.perceivedImpact),

                            },

                          ]}

                        />

                      </View>

                    </Card>

                  </Pressable>

                );

              })}

            </Col>

          ) : (

            <NoLinkMessage />

          )}

        </Section>

        {/* Annotation / notes */}

        {trigger.comment && (

          <Section>

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

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

              <Text style={styles.annotation}>

                "{trigger.comment?.trim()}"

              </Text>

            </Card>

          </Section>

        )}

        {/* Delete */}

        <View style={styles.section}>

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

          <Button

            variant="outline"

            isLoading={false}

            disabled={!canDelete}

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

            title="Editar Registro"

          />

          <Button

            variant="danger"

            isLoading={deleteTrigger.isPending}

            disabled={!canDelete || deleteTrigger.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,

  },

  iconWrap: {

    width: 40,

    height: 40,

    borderRadius: 20,

    alignItems: 'center',

    justifyContent: 'center',

    marginTop: 1

  },

  headerCardContent: {

    flexDirection: "row",

    alignItems: "center",

    gap: 8,

  },

  triggerLabel: {

    ...Typography.headlineLg,

    color: Colors.light.text,

  },

  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,

  },

  triggerMoment: {

    fontSize: 13,

    color: Colors.light.textSecondary,

  },

  // Sections

  section: {

    gap: 8,

  },

  sectionLabel: {

    fontSize: 11,

    fontWeight: "600",

    letterSpacing: 0.8,

    color: Colors.light.textSecondary,

    textTransform: "uppercase",

  },

  // Annotation

  annotation: {

    fontSize: 14,

    lineHeight: 22,

    color: Colors.light.textSecondary,

    fontStyle: "italic",

    padding: 4,

  },

  // Linked mood cards

  linkCard: {

    padding: Spacing.cardGap,

    overflow: "hidden",

    gap: 10,

  },

  linkIconCircle: {

    width: 44,

    height: 44,

    alignItems: "center",

    justifyContent: "center",

  },

  linkMoodEmoji: {

    fontSize: 28,

  },

  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,

  },

});