import React, { useState, useMemo } from "react";
import {
  View,
  Pressable,
  Modal,
  ScrollView,
  ActivityIndicator,
  TextInput,
  Dimensions,
} from "react-native";
import { useSirouRouter } from "@sirou/react-native";
import { Text } from "@/components/ui/text";
import { Search, X, Plus, User, Building2, ChevronDown, Check } from "@/lib/icons";
import { api } from "@/lib/api";
import { useColorScheme } from "nativewind";

const { height: SCREEN_HEIGHT } = Dimensions.get("window");

interface CustomerData {
  id: string;
  name: string;
  email: string;
  phone: string;
}

interface CustomerPickerProps {
  selectedIds: string[];
  selectedCustomers: CustomerData[];
  onSelect: (ids: string[], customers: CustomerData[]) => void;
  placeholder?: string;
}

export function CustomerPicker({ selectedIds, selectedCustomers, onSelect, placeholder }: CustomerPickerProps) {
  const nav = useSirouRouter<any>();
  const { colorScheme } = useColorScheme();
  const isDark = colorScheme === "dark";

  const [show, setShow] = useState(false);
  const [customers, setCustomers] = useState<any[]>([]);
  const [loading, setLoading] = useState(false);
  const [search, setSearch] = useState("");

  const [tempIds, setTempIds] = useState<string[]>(selectedIds);
  const [tempCustomers, setTempCustomers] = useState<CustomerData[]>(selectedCustomers);

  const openPicker = async () => {
    setShow(true);
    setTempIds(selectedIds);
    setTempCustomers(selectedCustomers);
    setSearch("");
    setLoading(true);
    try {
      const res = await api.customers.getAll({ query: { page: 1, limit: 50 } });
      setCustomers(res?.data || []);
    } catch {
      setCustomers([]);
    } finally {
      setLoading(false);
    }
  };

  const toggleCustomer = (c: any) => {
    const id = String(c.id);
    const name = c.displayName || `${c.firstName || ""} ${c.lastName || ""}`.trim() || c.companyName || "";

    let newIds: string[];
    let newCustomers: CustomerData[];

    if (tempIds.includes(id)) {
      newIds = tempIds.filter((i) => i !== id);
      newCustomers = tempCustomers.filter((p) => p.id !== id);
    } else {
      newIds = [...tempIds, id];
      newCustomers = [
        ...tempCustomers,
        { id, name, email: c.email || "", phone: c.phone || "" },
      ];
    }

    setTempIds(newIds);
    setTempCustomers(newCustomers);
    onSelect(newIds, newCustomers);
  };

  const filtered = useMemo(() => {
    if (!search.trim()) return customers;
    const q = search.toLowerCase();
    return customers.filter(
      (c: any) =>
        (c.displayName || "")?.toLowerCase().includes(q) ||
        (c.firstName || "")?.toLowerCase().includes(q) ||
        (c.lastName || "")?.toLowerCase().includes(q) ||
        (c.email || "")?.toLowerCase().includes(q) ||
        (c.phone || "")?.toLowerCase().includes(q),
    );
  }, [customers, search]);

  const triggerLabel = selectedIds.length === 0
    ? (placeholder || "Select customers")
    : selectedIds.length === 1
      ? selectedCustomers[0]?.name || placeholder
      : `${selectedIds.length} customers selected`;

  return (
    <>
      <Pressable
        onPress={openPicker}
        className="h-11 px-3 border border-border rounded-[6px] flex-row items-center justify-between bg-card"
      >
        <Text
          className={`text-xs font-sans-medium flex-1 mr-2 ${
            selectedIds.length > 0 ? "text-foreground" : "text-muted-foreground"
          }`}
          numberOfLines={1}
        >
          {triggerLabel}
        </Text>
        <ChevronDown size={14} color="#94a3b8" strokeWidth={2.5} />
      </Pressable>

      <Modal
        visible={show}
        transparent
        animationType="slide"
        onRequestClose={() => setShow(false)}
      >
        <Pressable className="flex-1 bg-black/40" onPress={() => setShow(false)}>
          <View className="flex-1 justify-end">
            <Pressable
              className="bg-card rounded-t-[36px] overflow-hidden border-t-[3px] border-border/20"
              style={{ maxHeight: SCREEN_HEIGHT * 0.8 }}
              onPress={(e) => e.stopPropagation()}
            >
              <View className="px-6 pb-4 pt-4 flex-row justify-between items-center">
                <View className="w-10" />
                <Text className="text-foreground font-sans-bold text-[18px]">Customers</Text>
                <Pressable
                  onPress={() => setShow(false)}
                  className="h-8 w-8 bg-secondary/80 rounded-full items-center justify-center border border-border/10"
                >
                  <X size={14} color={isDark ? "#f1f5f9" : "#0f172a"} strokeWidth={2.5} />
                </Pressable>
              </View>

              <View className="px-5 pb-4">
                <View className="bg-background rounded-[6px] border border-border flex-row items-center px-3.5 py-2.5">
                  <Search size={15} color="#94a3b8" strokeWidth={2} />
                  <TextInput
                    className="flex-1 ml-2.5 text-foreground font-sans-medium text-sm"
                    placeholder="Search customers..."
                    placeholderTextColor="#94a3b8"
                    value={search}
                    onChangeText={setSearch}
                  />
                  {search.length > 0 && (
                    <Pressable onPress={() => setSearch("")}>
                      <X size={14} color="#94a3b8" strokeWidth={2.5} />
                    </Pressable>
                  )}
                </View>
              </View>

              <View className="px-5 pb-5">
                <Pressable
                  onPress={() => { setShow(false); nav.go("customers/create"); }}
                  className="bg-primary rounded-[6px] py-3.5 flex-row items-center justify-center gap-2"
                >
                  <Plus size={16} color="white" strokeWidth={2.5} />
                  <Text className="text-white font-sans-bold text-sm">Add New Customer</Text>
                </Pressable>
              </View>

              <ScrollView
                className="px-5"
                showsVerticalScrollIndicator={false}
                contentContainerStyle={{ paddingBottom: 40 }}
              >
                {loading ? (
                  <View className="py-8 items-center">
                    <ActivityIndicator color="#E46212" size="small" />
                  </View>
                ) : filtered.length === 0 ? (
                  <View className="py-8 items-center">
                    <Text className="text-muted-foreground text-sm font-sans-medium">
                      {search ? "No customers match your search" : "No customers found"}
                    </Text>
                  </View>
                ) : (
                  filtered.map((c: any) => {
                    const isCompany = c.type === "COMPANY";
                    const isSelected = tempIds.includes(String(c.id));
                    return (
                      <Pressable
                        key={c.id}
                        onPress={() => toggleCustomer(c)}
                        className="bg-card rounded-[6px] border border-border p-4 mb-3 flex-row items-center"
                      >
                        <View className="flex-row items-center gap-3 flex-1">
                          <View className={`h-9 w-9 rounded-full items-center justify-center ${isCompany ? "bg-blue-500/10" : "bg-primary/10"}`}>
                            {isCompany ? (
                              <Building2 color="#2563eb" size={16} strokeWidth={2} />
                            ) : (
                              <User color="#E46212" size={16} strokeWidth={2} />
                            )}
                          </View>
                          <View className="flex-1">
                            <Text className="text-foreground font-sans-bold text-sm">
                              {c.displayName || `${c.firstName || ""} ${c.lastName || ""}`.trim() || c.companyName || "—"}
                            </Text>
                            {c.email && (
                              <Text className="text-muted-foreground text-[11px] font-sans-medium mt-0.5">
                                {c.email}
                              </Text>
                            )}
                          </View>
                          <View className={`px-2 py-0.5 rounded-[3px] ${isCompany ? "bg-blue-500/10" : "bg-primary/10"}`}>
                            <Text className={`text-[8px] font-sans-bold uppercase tracking-widest ${isCompany ? "text-blue-600" : "text-primary"}`}>
                              {isCompany ? "Company" : "Individual"}
                            </Text>
                          </View>
                        </View>
                        <View
                          className={`h-5 w-5 rounded-full border-2 items-center justify-center ml-3 ${
                            isSelected ? "bg-primary border-primary" : "border-muted-foreground/40"
                          }`}
                        >
                          {isSelected && <Check size={12} color="white" strokeWidth={3} />}
                        </View>
                      </Pressable>
                    );
                  })
                )}
              </ScrollView>
            </Pressable>
          </View>
        </Pressable>
      </Modal>
    </>
  );
}