import { BORDER_RADIUS, COLORS, SPACING } from "@/constants/theme";
import { useAuth } from "@/contexts/AuthContext";
import { obterCorridas } from "@/services/db";
import { router, useFocusEffect } from "expo-router";
import React, { useCallback, useState } from "react";
import {
  FlatList,
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from "react-native";
import { SafeAreaView } from "react-native-safe-area-context";

type Corrida = {
  id: string;
  data: string;
  empresa: string;
  km: number;
  custoPorKm: number;
  total: number;
};

const HistoricoItem = ({ item, index }: { item: Corrida; index: number }) => (
  <View style={styles.item}>
    <View style={styles.itemHeader}>
      <Text style={styles.itemNumber}>#{index + 1}</Text>
      <Text style={styles.itemDate}>{item.data}</Text>
    </View>

    <View style={styles.itemEmpresa}>
      <Text style={styles.empresaLabel}>{item.empresa}</Text>
    </View>

    <View style={styles.itemDetails}>
      <View style={styles.detailBox}>
        <Text style={styles.detailLabel}>Distância</Text>
        <Text style={styles.detailValue}>{item.km} km</Text>
      </View>
      <View style={styles.detailBox}>
        <Text style={styles.detailLabel}>Valor/km</Text>
        <Text style={styles.detailValue}>R$ {item.custoPorKm.toFixed(2)}</Text>
      </View>
      <View style={[styles.detailBox, styles.detailBoxHighlight]}>
        <Text style={styles.detailLabel}>Total</Text>
        <Text style={[styles.detailValue, styles.detailValueHighlight]}>
          R$ {item.total.toFixed(2)}
        </Text>
      </View>
    </View>
  </View>
);

export default function HistoricoPage() {
  const { user } = useAuth();
  const [corridas, setCorridas] = useState<Corrida[]>([]);

  const loadCorridas = useCallback(async () => {
    if (!user?.id) return;
    try {
      const data = await obterCorridas(user.id);
      setCorridas(
        data.map((c) => ({
          id: c.id,
          data: c.data,
          empresa: c.empresa,
          km: c.km,
          custoPorKm: c.custo_por_km,
          total: c.total,
        })),
      );
    } catch (error) {
      console.error("Erro ao carregar histórico:", error);
    }
  }, [user?.id]);

  useFocusEffect(useCallback(() => { loadCorridas(); }, [loadCorridas]));

  const totalGanhos = corridas.reduce((acc, c) => acc + c.total, 0);
  const totalKm = corridas.reduce((acc, c) => acc + c.km, 0);

  return (
    <SafeAreaView style={styles.container}>
      <View style={styles.header}>
        <TouchableOpacity onPress={() => router.back()} style={styles.backButton} activeOpacity={0.7}>
          <Text style={styles.backIcon}>←</Text>
          <Text style={styles.backLabel}>Voltar</Text>
        </TouchableOpacity>
      </View>

      <View style={styles.titleSection}>
        <Text style={styles.title}>Histórico</Text>
        <Text style={styles.subtitle}>
          {corridas.length} corrida{corridas.length !== 1 ? "s" : ""} registrada{corridas.length !== 1 ? "s" : ""}
        </Text>
      </View>

      {corridas.length > 0 && (
        <View style={styles.summaryRow}>
          <View style={styles.summaryCard}>
            <Text style={styles.summaryValue}>{totalKm.toFixed(0)} km</Text>
            <Text style={styles.summaryLabel}>Total Rodado</Text>
          </View>
          <View style={[styles.summaryCard, styles.summaryCardAccent]}>
            <Text style={[styles.summaryValue, styles.summaryValueAccent]}>
              R$ {totalGanhos.toFixed(2)}
            </Text>
            <Text style={styles.summaryLabel}>Total Ganho</Text>
          </View>
        </View>
      )}

      {corridas.length === 0 ? (
        <ScrollView contentContainerStyle={styles.emptyContainer}>
          <View style={styles.emptyBox}>
            <Text style={styles.emptyEmoji}>🚗</Text>
            <Text style={styles.emptyTitle}>Nenhuma corrida ainda</Text>
            <Text style={styles.emptyText}>
              Registre sua primeira corrida para vê-la aqui.
            </Text>
          </View>
        </ScrollView>
      ) : (
        <FlatList
          data={corridas}
          keyExtractor={(item) => item.id}
          renderItem={({ item, index }) => (
            <HistoricoItem item={item} index={index} />
          )}
          contentContainerStyle={styles.listContent}
          showsVerticalScrollIndicator={false}
        />
      )}
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: COLORS.background,
  },
  header: {
    paddingHorizontal: SPACING.lg,
    paddingVertical: SPACING.md,
    borderBottomWidth: 1,
    borderBottomColor: COLORS.border,
  },
  backButton: {
    flexDirection: "row",
    alignItems: "center",
    gap: SPACING.xs,
    alignSelf: "flex-start",
  },
  backIcon: {
    fontSize: 18,
    color: COLORS.text,
  },
  backLabel: {
    fontSize: 15,
    color: COLORS.textSecondary,
    fontWeight: "500",
  },
  titleSection: {
    paddingHorizontal: SPACING.lg,
    paddingTop: SPACING.lg,
    paddingBottom: SPACING.md,
  },
  title: {
    fontSize: 28,
    fontWeight: "800",
    color: COLORS.text,
    marginBottom: 4,
  },
  subtitle: {
    fontSize: 13,
    color: COLORS.textTertiary,
  },
  summaryRow: {
    flexDirection: "row",
    gap: SPACING.sm,
    paddingHorizontal: SPACING.lg,
    paddingBottom: SPACING.lg,
  },
  summaryCard: {
    flex: 1,
    backgroundColor: COLORS.surface,
    borderRadius: BORDER_RADIUS.lg,
    padding: SPACING.md,
    borderWidth: 1,
    borderColor: COLORS.border,
  },
  summaryCardAccent: {
    borderColor: COLORS.success,
  },
  summaryValue: {
    fontSize: 18,
    fontWeight: "800",
    color: COLORS.text,
    marginBottom: 2,
  },
  summaryValueAccent: {
    color: COLORS.success,
  },
  summaryLabel: {
    fontSize: 11,
    color: COLORS.textTertiary,
    fontWeight: "600",
    textTransform: "uppercase",
    letterSpacing: 0.5,
  },
  listContent: {
    padding: SPACING.lg,
    paddingBottom: SPACING.xxl,
  },
  item: {
    backgroundColor: COLORS.surface,
    borderRadius: BORDER_RADIUS.lg,
    marginBottom: SPACING.md,
    overflow: "hidden",
    borderWidth: 1,
    borderColor: COLORS.border,
  },
  itemHeader: {
    flexDirection: "row",
    paddingHorizontal: SPACING.lg,
    paddingTop: SPACING.md,
    paddingBottom: SPACING.sm,
    justifyContent: "space-between",
    alignItems: "center",
    borderBottomWidth: 1,
    borderBottomColor: COLORS.border,
  },
  itemNumber: {
    fontSize: 12,
    fontWeight: "700",
    color: COLORS.textTertiary,
    letterSpacing: 0.5,
  },
  itemDate: {
    fontSize: 12,
    color: COLORS.textTertiary,
  },
  itemEmpresa: {
    paddingHorizontal: SPACING.lg,
    paddingVertical: SPACING.sm,
    backgroundColor: COLORS.surfaceLight,
  },
  empresaLabel: {
    fontSize: 14,
    fontWeight: "700",
    color: COLORS.text,
  },
  itemDetails: {
    flexDirection: "row",
    paddingHorizontal: SPACING.lg,
    paddingVertical: SPACING.md,
  },
  detailBox: {
    flex: 1,
  },
  detailBoxHighlight: {
    alignItems: "flex-end",
  },
  detailLabel: {
    fontSize: 10,
    color: COLORS.textTertiary,
    fontWeight: "600",
    textTransform: "uppercase",
    letterSpacing: 0.4,
    marginBottom: 3,
  },
  detailValue: {
    fontSize: 14,
    fontWeight: "700",
    color: COLORS.text,
  },
  detailValueHighlight: {
    color: COLORS.success,
    fontSize: 16,
  },
  emptyContainer: {
    flex: 1,
    justifyContent: "center",
    alignItems: "center",
    padding: SPACING.lg,
  },
  emptyBox: {
    alignItems: "center",
  },
  emptyEmoji: {
    fontSize: 48,
    marginBottom: SPACING.lg,
  },
  emptyTitle: {
    fontSize: 18,
    fontWeight: "700",
    color: COLORS.text,
    marginBottom: SPACING.sm,
  },
  emptyText: {
    fontSize: 14,
    color: COLORS.textTertiary,
    textAlign: "center",
    lineHeight: 20,
  },
});
