import { IconSymbol } from "@/components/ui/icon-symbol";
import React, { useEffect, useState } from "react";
import {
  KeyboardAvoidingView,
  Modal,
  Platform,
  ScrollView,
  Text,
  TextInput,
  TouchableOpacity,
  View,
} from "react-native";
import styles from "./style/TripCostDetailModal.styles";

// ---------------------------
// 🧩 Interface
// ---------------------------
interface TripCostDetailModalProps {
  visible: boolean;
  onClose: () => void;
  data: Model.TripCost[];
}

// ---------------------------
// 💰 Component Modal
// ---------------------------
const TripCostDetailModal: React.FC<TripCostDetailModalProps> = ({
  visible,
  onClose,
  data,
}) => {
  const [isEditing, setIsEditing] = useState(false);
  const [editableData, setEditableData] = useState<Model.TripCost[]>(data);

  // Cập nhật editableData khi props data thay đổi (API fetch xong)
  useEffect(() => {
    setEditableData(data);
  }, [data]);

  const tongCong = editableData.reduce((sum, item) => sum + item.total_cost, 0);

  const handleEdit = () => {
    setIsEditing(!isEditing);
  };

  const handleSave = () => {
    setIsEditing(false);
    // TODO: Save data to backend
    console.log("Saved data:", editableData);
  };

  const handleCancel = () => {
    setIsEditing(false);
    setEditableData(data); // Reset to original data
  };

  const updateItem = (
    index: number,
    field: keyof Model.TripCost,
    value: string
  ) => {
    setEditableData((prev) =>
      prev.map((item, idx) => {
        if (idx === index) {
          const updated = { ...item, [field]: value };
          // Recalculate total_cost
          if (field === "amount" || field === "cost_per_unit") {
            const amount =
              Number(field === "amount" ? value : item.amount) || 0;
            const costPerUnit =
              Number(field === "cost_per_unit" ? value : item.cost_per_unit) ||
              0;
            updated.total_cost = amount * costPerUnit;
          }
          return updated;
        }
        return item;
      })
    );
  };

  return (
    <Modal
      visible={visible}
      animationType="slide"
      presentationStyle="pageSheet"
      onRequestClose={onClose}
    >
      <KeyboardAvoidingView
        style={{ flex: 1 }}
        behavior={Platform.OS === "ios" ? "padding" : "height"}
        keyboardVerticalOffset={60}
      >
        <View style={styles.container}>
          {/* Header */}
          <View style={styles.header}>
            <Text style={styles.title}>Chi tiết chi phí chuyến đi</Text>
            <View style={styles.headerButtons}>
              {isEditing ? (
                <>
                  <TouchableOpacity
                    onPress={handleCancel}
                    style={styles.cancelButton}
                  >
                    <Text style={styles.cancelButtonText}>Hủy</Text>
                  </TouchableOpacity>
                  <TouchableOpacity
                    onPress={handleSave}
                    style={styles.saveButton}
                  >
                    <Text style={styles.saveButtonText}>Lưu</Text>
                  </TouchableOpacity>
                </>
              ) : (
                <TouchableOpacity
                  onPress={handleEdit}
                  style={styles.editButton}
                >
                  <View style={styles.editIconButton}>
                    <IconSymbol
                      name="pencil"
                      size={28}
                      color="#fff"
                      weight="heavy"
                    />
                  </View>
                </TouchableOpacity>
              )}
              <TouchableOpacity onPress={onClose} style={styles.closeButton}>
                <View style={styles.closeIconButton}>
                  <IconSymbol name="xmark" size={28} color="#fff" />
                </View>
              </TouchableOpacity>
            </View>
          </View>

          {/* Content */}
          <ScrollView style={styles.content}>
            {editableData.map((item, index) => (
              <View key={index} style={styles.itemCard}>
                {/* Loại */}
                <View style={styles.fieldGroup}>
                  <Text style={styles.label}>Loại chi phí</Text>
                  <TextInput
                    style={[styles.input, !isEditing && styles.inputDisabled]}
                    value={item.type}
                    onChangeText={(value) => updateItem(index, "type", value)}
                    editable={isEditing}
                    placeholder="Nhập loại chi phí"
                  />
                </View>

                {/* Số lượng & Đơn vị */}
                <View style={styles.rowGroup}>
                  <View
                    style={[styles.fieldGroup, { flex: 1, marginRight: 8 }]}
                  >
                    <Text style={styles.label}>Số lượng</Text>
                    <TextInput
                      style={[styles.input, !isEditing && styles.inputDisabled]}
                      value={String(item.amount ?? "")}
                      onChangeText={(value) =>
                        updateItem(index, "amount", value)
                      }
                      editable={isEditing}
                      keyboardType="numeric"
                      placeholder="0"
                    />
                  </View>
                  <View style={[styles.fieldGroup, { flex: 1, marginLeft: 8 }]}>
                    <Text style={styles.label}>Đơn vị</Text>
                    <TextInput
                      style={[styles.input, !isEditing && styles.inputDisabled]}
                      value={item.unit}
                      onChangeText={(value) => updateItem(index, "unit", value)}
                      editable={isEditing}
                      placeholder="kg, lít..."
                    />
                  </View>
                </View>

                {/* Chi phí/đơn vị */}
                <View style={styles.fieldGroup}>
                  <Text style={styles.label}>Chi phí/đơn vị (VNĐ)</Text>
                  <TextInput
                    style={[styles.input, !isEditing && styles.inputDisabled]}
                    value={String(item.cost_per_unit ?? "")}
                    onChangeText={(value) =>
                      updateItem(index, "cost_per_unit", value)
                    }
                    editable={isEditing}
                    keyboardType="numeric"
                    placeholder="0"
                  />
                </View>

                {/* Tổng chi phí */}
                <View style={styles.fieldGroup}>
                  <Text style={styles.label}>Tổng chi phí</Text>
                  <View style={styles.totalContainer}>
                    <Text style={styles.totalText}>
                      {item.total_cost.toLocaleString()} VNĐ
                    </Text>
                  </View>
                </View>
              </View>
            ))}

            {/* Footer Total */}
            <View style={styles.footerTotal}>
              <Text style={styles.footerLabel}>Tổng cộng</Text>
              <Text style={styles.footerAmount}>
                {tongCong.toLocaleString()} VNĐ
              </Text>
            </View>
          </ScrollView>
        </View>
      </KeyboardAvoidingView>
    </Modal>
  );
};

export default TripCostDetailModal;