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 {
  Alert,
  ScrollView,
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from "react-native";
import { SafeAreaView } from "react-native-safe-area-context";

type Stats = {
  totalCorridas: number;
  totalKm: number;
  totalGanhos: number;
};

type Action = {
  icon: string;
  label: string;
  description: string;
  onPress: () => void;
  highlight?: boolean;
};

function greeting() {
  const h = new Date().getHours();
  if (h < 12) return "Bom dia";
  if (h < 18) return "Boa tarde";
  return "Boa noite";
}

export default function Home() {
  const { user, logout } = useAuth();
  const userName = user?.name ?? "Usuário";
  const firstName = userName.split(" ")[0];

  const [stats, setStats] = useState<Stats>({
    totalCorridas: 0,
    totalKm: 0,
    totalGanhos: 0,
  });

  const loadStats = useCallback(async () => {
    if (!user?.id) return;
    try {
      const corridas = await obterCorridas(user.id);
      setStats({
        totalCorridas: corridas.length,
        totalKm: corridas.reduce((acc, c) => acc + c.km, 0),
        totalGanhos: corridas.reduce((acc, c) => acc + c.total, 0),
      });
    } catch (error) {
      console.error("Erro ao carregar estatísticas:", error);
    }
  }, [user?.id]);

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

  const handleProfilePress = () => {
    Alert.alert(userName, user?.email ?? "", [
      {
        text: "Editar Perfil",
        onPress: () => Alert.alert("Em breve", "Funcionalidade em desenvolvimento."),
      },
      {
        text: "Sair",
        style: "destructive",
        onPress: () =>
          Alert.alert("Sair", "Tem certeza que deseja sair?", [
            { text: "Cancelar", style: "cancel" },
            {
              text: "Sair",
              style: "destructive",
              onPress: async () => {
                try {
                  await logout();
                } catch (e) {
                  console.error("Logout error:", e);
                }
              },
            },
          ]),
      },
      { text: "Cancelar", style: "cancel" },
    ]);
  };

  const today = new Date().toLocaleDateString("pt-BR", {
    weekday: "long",
    day: "numeric",
    month: "long",
  });

  const actions: Action[] = [
    {
      icon: "🚗",
      label: "Registrar Corrida",
      description: "Lançar nova corrida",
      onPress: () => router.push("/corrida"),
      highlight: true,
    },
    {
      icon: "📋",
      label: "Histórico",
      description: "Ver corridas anteriores",
      onPress: () => router.push("/corrida"),
    },
    {
      icon: "📊",
      label: "Relatório",
      description: "Análise de ganhos",
      onPress: () => Alert.alert("Em breve", "Funcionalidade em desenvolvimento."),
    },
    {
      icon: "⚙️",
      label: "Configurações",
      description: "Preferências do app",
      onPress: () => Alert.alert("Em breve", "Funcionalidade em desenvolvimento."),
    },
  ];

  return (
    <SafeAreaView style={styles.container}>
      {/* Header */}
      <View style={styles.header}>
        <View>
          <Text style={styles.headerLogo}>TopTran</Text>
          <Text style={styles.headerSub}>Sistema de Gestão</Text>
        </View>
        <TouchableOpacity style={styles.avatarButton} onPress={handleProfilePress} activeOpacity={0.8}>
          <View style={styles.avatar}>
            <Text style={styles.avatarText}>
              {firstName.charAt(0).toUpperCase()}
            </Text>
          </View>
          <View style={styles.avatarOnline} />
        </TouchableOpacity>
      </View>

      <ScrollView
        contentContainerStyle={styles.scrollContent}
        showsVerticalScrollIndicator={false}
      >
        {/* Greeting */}
        <View style={styles.greetingSection}>
          <Text style={styles.greetingText}>
            {greeting()}, {firstName}! 👋
          </Text>
          <Text style={styles.dateText}>{today}</Text>
        </View>

        {/* Stats */}
        <Text style={styles.sectionTitle}>Resumo Geral</Text>
        <View style={styles.statsRow}>
          <View style={styles.statCard}>
            <Text style={styles.statValue}>{stats.totalCorridas}</Text>
            <Text style={styles.statLabel}>Corridas</Text>
          </View>
          <View style={styles.statCard}>
            <Text style={styles.statValue}>
              {stats.totalKm.toFixed(0)}
            </Text>
            <Text style={styles.statLabel}>Km Rodados</Text>
          </View>
          <View style={[styles.statCard, styles.statCardAccent]}>
            <Text style={[styles.statValue, styles.statValueAccent]}>
              R${stats.totalGanhos.toFixed(0)}
            </Text>
            <Text style={[styles.statLabel, styles.statLabelAccent]}>
              Total Ganho
            </Text>
          </View>
        </View>

        {/* Actions Grid */}
        <Text style={styles.sectionTitle}>Acesso Rápido</Text>
        <View style={styles.actionsGrid}>
          {actions.map((action, index) => (
            <TouchableOpacity
              key={index}
              style={[
                styles.actionCard,
                action.highlight && styles.actionCardHighlight,
              ]}
              onPress={action.onPress}
              activeOpacity={0.75}
            >
              <Text style={styles.actionIcon}>{action.icon}</Text>
              <Text
                style={[
                  styles.actionLabel,
                  action.highlight && styles.actionLabelHighlight,
                ]}
              >
                {action.label}
              </Text>
              <Text style={styles.actionDescription}>{action.description}</Text>
            </TouchableOpacity>
          ))}
        </View>

        <Text style={styles.footer}>© 2025 TopTran</Text>
      </ScrollView>
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: COLORS.background,
  },

  // Header
  header: {
    flexDirection: "row",
    justifyContent: "space-between",
    alignItems: "center",
    paddingHorizontal: SPACING.lg,
    paddingVertical: SPACING.md,
    borderBottomWidth: 1,
    borderBottomColor: COLORS.border,
  },
  headerLogo: {
    fontSize: 22,
    fontWeight: "900",
    color: COLORS.text,
    letterSpacing: 1,
  },
  headerSub: {
    fontSize: 11,
    color: COLORS.textTertiary,
    letterSpacing: 0.5,
  },
  avatarButton: {
    position: "relative",
  },
  avatar: {
    width: 42,
    height: 42,
    borderRadius: BORDER_RADIUS.round,
    backgroundColor: COLORS.surfaceLight,
    borderWidth: 2,
    borderColor: COLORS.borderLight,
    justifyContent: "center",
    alignItems: "center",
  },
  avatarText: {
    color: COLORS.text,
    fontSize: 18,
    fontWeight: "700",
  },
  avatarOnline: {
    position: "absolute",
    bottom: 1,
    right: 1,
    width: 10,
    height: 10,
    borderRadius: 5,
    backgroundColor: COLORS.success,
    borderWidth: 2,
    borderColor: COLORS.background,
  },

  // Scroll
  scrollContent: {
    padding: SPACING.lg,
    paddingBottom: SPACING.xxl,
  },

  // Greeting
  greetingSection: {
    marginTop: SPACING.md,
    marginBottom: SPACING.xl,
  },
  greetingText: {
    fontSize: 26,
    fontWeight: "800",
    color: COLORS.text,
    marginBottom: 4,
  },
  dateText: {
    fontSize: 13,
    color: COLORS.textTertiary,
    textTransform: "capitalize",
  },

  // Section title
  sectionTitle: {
    fontSize: 12,
    fontWeight: "700",
    color: COLORS.textTertiary,
    textTransform: "uppercase",
    letterSpacing: 1.2,
    marginBottom: SPACING.md,
  },

  // Stats
  statsRow: {
    flexDirection: "row",
    gap: SPACING.sm,
    marginBottom: SPACING.xl,
  },
  statCard: {
    flex: 1,
    backgroundColor: COLORS.surface,
    borderRadius: BORDER_RADIUS.lg,
    padding: SPACING.md,
    borderWidth: 1,
    borderColor: COLORS.border,
  },
  statCardAccent: {
    backgroundColor: COLORS.surfaceLight,
    borderColor: COLORS.borderLight,
  },
  statValue: {
    fontSize: 20,
    fontWeight: "800",
    color: COLORS.text,
    marginBottom: 2,
  },
  statValueAccent: {
    color: COLORS.success,
  },
  statLabel: {
    fontSize: 10,
    color: COLORS.textTertiary,
    fontWeight: "600",
    textTransform: "uppercase",
    letterSpacing: 0.5,
  },
  statLabelAccent: {
    color: COLORS.textSecondary,
  },

  // Actions grid
  actionsGrid: {
    flexDirection: "row",
    flexWrap: "wrap",
    gap: SPACING.sm,
    marginBottom: SPACING.xl,
  },
  actionCard: {
    width: "48%",
    backgroundColor: COLORS.surface,
    borderRadius: BORDER_RADIUS.lg,
    padding: SPACING.lg,
    borderWidth: 1,
    borderColor: COLORS.border,
    minHeight: 110,
    justifyContent: "space-between",
  },
  actionCardHighlight: {
    backgroundColor: COLORS.surfaceLight,
    borderColor: COLORS.text,
  },
  actionIcon: {
    fontSize: 28,
    marginBottom: SPACING.sm,
  },
  actionLabel: {
    fontSize: 14,
    fontWeight: "700",
    color: COLORS.text,
    marginBottom: 2,
  },
  actionLabelHighlight: {
    color: COLORS.text,
  },
  actionDescription: {
    fontSize: 11,
    color: COLORS.textTertiary,
  },

  // Footer
  footer: {
    textAlign: "center",
    fontSize: 12,
    color: COLORS.textTertiary,
    marginTop: SPACING.sm,
  },
});
