"use client";
import React, { createContext, useContext, useState, useEffect } from "react";
import axios from 'axios';


const CurrencyContext = createContext();

export const SUPPORTED_CURRENCIES = {
  INR: { symbol: "₹", name: "Indian Rupee", country: "India" },
  MYR: { symbol: "RM", name: "Malaysian Ringgit", country: "Malaysia" },
  NPR: { symbol: "रू", name: "Nepalese Rupee", country: "Nepal" },
  ERN: { symbol: "Nfk", name: "Eritrean nakfa", country: "Eritrea" },
  XAF: { symbol: "Fr", name: "Central African CFA franc", country: "Cameroon" },
  EUR: { symbol: "€", name: "Euro", country: "Montenegro" },
  FJD: { symbol: "$", name: "Fijian dollar", country: "Fiji" },
  TND: { symbol: "د.ت", name: "Tunisian dinar", country: "Tunisia" },
  XOF: { symbol: "Fr", name: "West African CFA franc", country: "Senegal" },
  GBP: { symbol: "£", name: "British pound", country: "South Georgia" },
  BRL: { symbol: "R$", name: "Brazilian real", country: "Brazil" },
  CHF: { symbol: "Fr", name: "Swiss franc", country: "Liechtenstein" },
  MXN: { symbol: "$", name: "Mexican peso", country: "Mexico" },
  EGP: { symbol: "E£", name: "Egyptian pound", country: "Palestine" },
  DKK: { symbol: "kr.", name: "krone", country: "Greenland" },
  USD: { symbol: "$", name: "United States dollar", country: "United States Minor Outlying Islands" },
  TRY: { symbol: "₺", name: "Turkish lira", country: "Turkey" },
  HNL: { symbol: "L", name: "Honduran lempira", country: "Honduras" },
  RON: { symbol: "lei", name: "Romanian leu", country: "Romania" },
  NAD: { symbol: "$", name: "Namibian dollar", country: "Namibia" },
  RWF: { symbol: "Fr", name: "Rwandan franc", country: "Rwanda" },
  XCD: { symbol: "$", name: "Eastern Caribbean dollar", country: "Saint Vincent and the Grenadines" },
  BGN: { symbol: "лв", name: "Bulgarian lev", country: "Bulgaria" },
  COP: { symbol: "$", name: "Colombian peso", country: "Colombia" },
  SRD: { symbol: "$", name: "Surinamese dollar", country: "Suriname" },
  ZWL: { symbol: "$", name: "Zimbabwean dollar", country: "Zimbabwe" },
  VES: { symbol: "Bs.S.", name: "Venezuelan bolívar soberano", country: "Venezuela" },
  SZL: { symbol: "L", name: "Swazi lilangeni", country: "Eswatini" },
  PHP: { symbol: "₱", name: "Philippine peso", country: "Philippines" },
  TMT: { symbol: "m", name: "Turkmenistan manat", country: "Turkmenistan" },
  DZD: { symbol: "د.ج", name: "Algerian dinar", country: "Algeria" },
  JMD: { symbol: "$", name: "Jamaican dollar", country: "Jamaica" },
  AMD: { symbol: "֏", name: "Armenian dram", country: "Armenia" },
  SBD: { symbol: "$", name: "Solomon Islands dollar", country: "Solomon Islands" },
  CUC: { symbol: "$", name: "Cuban convertible peso", country: "Cuba" },
  LRD: { symbol: "$", name: "Liberian dollar", country: "Liberia" },
  SDG: { symbol: "ج.س", name: "Sudanese pound", country: "Sudan" },
  TZS: { symbol: "Sh", name: "Tanzanian shilling", country: "Tanzania" },
  BZD: { symbol: "$", name: "Belize dollar", country: "Belize" },
  BBD: { symbol: "$", name: "Barbadian dollar", country: "Barbados" },
  LBP: { symbol: "ل.ل", name: "Lebanese pound", country: "Lebanon" },
  MDL: { symbol: "L", name: "Moldovan leu", country: "Moldova" },
  TWD: { symbol: "$", name: "New Taiwan dollar", country: "Taiwan" },
  VND: { symbol: "₫", name: "Vietnamese đồng", country: "Vietnam" },
  XPF: { symbol: "₣", name: "CFP franc", country: "French Polynesia" },
  NZD: { symbol: "$", name: "New Zealand dollar", country: "Tokelau" },
  UGX: { symbol: "Sh", name: "Ugandan shilling", country: "Uganda" },
  ANG: { symbol: "ƒ", name: "Netherlands Antillean guilder", country: "Sint Maarten" },
  KZT: { symbol: "₸", name: "Kazakhstani tenge", country: "Kazakhstan" },
  SSP: { symbol: "£", name: "South Sudanese pound", country: "South Sudan" },
  TJS: { symbol: "ЅМ", name: "Tajikistani somoni", country: "Tajikistan" },
  CVE: { symbol: "Esc", name: "Cape Verdean escudo", country: "Cape Verde" },
  MVR: { symbol: ".ރ", name: "Maldivian rufiyaa", country: "Maldives" },
  YER: { symbol: "﷼", name: "Yemeni rial", country: "Yemen" },
  KPW: { symbol: "₩", name: "North Korean won", country: "North Korea" },
  GEL: { symbol: "₾", name: "lari", country: "Georgia" },
  UZS: { symbol: "so'm", name: "Uzbekistani soʻm", country: "Uzbekistan" },
  DOP: { symbol: "$", name: "Dominican peso", country: "Dominican Republic" },
  MZN: { symbol: "MT", name: "Mozambican metical", country: "Mozambique" },
  THB: { symbol: "฿", name: "Thai baht", country: "Thailand" },
  ILS: { symbol: "₪", name: "Israeli new shekel", country: "Israel" },
  FKP: { symbol: "£", name: "Falkland Islands pound", country: "Falkland Islands" },
  IDR: { symbol: "Rp", name: "Indonesian rupiah", country: "Indonesia" },
  PGK: { symbol: "K", name: "Papua New Guinean kina", country: "Papua New Guinea" },
  BHD: { symbol: ".د.ب", name: "Bahraini dinar", country: "Bahrain" },
  MOP: { symbol: "P", name: "Macanese pataca", country: "Macau" },
  SYP: { symbol: "£", name: "Syrian pound", country: "Syria" },
  PLN: { symbol: "zł", name: "Polish złoty", country: "Poland" },
  ZMW: { symbol: "ZK", name: "Zambian kwacha", country: "Zambia" },
  AUD: { symbol: "$", name: "Australian dollar", country: "Kiribati" },
  PEN: { symbol: "S/ ", name: "Peruvian sol", country: "Peru" },
  UYU: { symbol: "$", name: "Uruguayan peso", country: "Uruguay" },
  IRR: { symbol: "﷼", name: "Iranian rial", country: "Iran" },
  HUF: { symbol: "Ft", name: "Hungarian forint", country: "Hungary" },
  WST: { symbol: "T", name: "Samoan tālā", country: "Samoa" },
  NGN: { symbol: "₦", name: "Nigerian naira", country: "Nigeria" },
  IQD: { symbol: "ع.د", name: "Iraqi dinar", country: "Iraq" },
  KWD: { symbol: "د.ك", name: "Kuwaiti dinar", country: "Kuwait" },
  CZK: { symbol: "Kč", name: "Czech koruna", country: "Czechia" },
  MAD: { symbol: "د.م.", name: "Moroccan dirham", country: "Morocco" }
};

export const CurrencyProvider = ({ children }) => {
  const [selectedCurrency, setSelectedCurrency] = useState("INR");
  useEffect(() => {
    const fetchCurrencyForCountry = async () => {
      try {
        let userCountry = localStorage.getItem('userCountry') || "India";

        const response = await axios.get(`https://restcountries.com/v3.1/name/${userCountry}`);
        if (response.data && response.data.length > 0) {
          const countryData = response.data[0];
          
          if (countryData.currencies) {
            const currencyCode = Object.keys(countryData.currencies)[0];
            
            if (currencyCode) {
              setSelectedCurrency(currencyCode);
            }
          }
        }
      } catch (error) {
        console.error("Error fetching currency for country:", error);
        setSelectedCurrency("INR")
      }
    };

    fetchCurrencyForCountry();
  }, []);
  const [exchangeRates, setExchangeRates] = useState(null);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState(null);
  const [userCountry, setUserCountry] = useState(null);
  const [allCountries, setAllCountries] = useState([]);
  const [countryCurrencyMap, setCountryCurrencyMap] = useState({});

  // Fetch all countries and their currencies
  const fetchCountriesAndCurrencies = async () => {
    try {
      // First, get the list of countries
      const countriesResponse = await fetch('https://countriesnow.space/api/v0.1/countries/');
      const countriesData = await countriesResponse.json();
      
      if (!countriesData.error) {
        setAllCountries(countriesData.data);
        
        const currencyResponse = await fetch('https://restcountries.com/v3.1/all?fields=name,currencies');
        const currencyData = await currencyResponse.json();
        
        const currencyMap = {};
        const currencyDetails = {};
        
        currencyData.forEach(country => {
          const countryName = country.name.common;
          if (country.currencies) {
            const currencyCode = Object.keys(country.currencies)[0];
            if (currencyCode) {
              currencyMap[countryName] = currencyCode;
              
              if (!currencyDetails[currencyCode]) {
                const currencyInfo = country.currencies[currencyCode];
                currencyDetails[currencyCode] = {
                  symbol: currencyInfo.symbol || currencyCode,
                  name: currencyInfo.name || `${currencyCode} Currency`,
                  country: countryName
                };
              }
            }
          }
        });
        
        Object.keys(currencyDetails).forEach(code => {
          if (!SUPPORTED_CURRENCIES[code]) {
            SUPPORTED_CURRENCIES[code] = currencyDetails[code];
          }
        });
        
        setCountryCurrencyMap(currencyMap);
        
        // Check if we have a stored country and set the currency accordingly
        const storedCountry = localStorage.getItem('userCountry');
        if (storedCountry && currencyMap[storedCountry]) {
          const currencyCode = currencyMap[storedCountry];
          if (currencyCode) {
            setSelectedCurrency(currencyCode);
            localStorage.setItem('selectedCurrency', currencyCode);
          }
        }
      }
    } catch (error) {
      console.error("Error fetching countries and currencies:", error);
    }
  };

  const fetchExchangeRates = async () => {
    try {
      setIsLoading(true);
      setError(null);

      const cachedData = localStorage.getItem("exchangeRates");
      const cached = cachedData ? JSON.parse(cachedData) : null;
      if (cached && new Date().getTime() - cached.timestamp < 24 * 60 * 60 * 1000) {
        setExchangeRates(cached.rates);
        setIsLoading(false);
        return;
      }

      try {
        const response = await axios.get(`https://open.er-api.com/v6/latest/${selectedCurrency}`);
        const data = response.data;
      
        if (!data.rates) {
          throw new Error("API request failed - no rates returned");
        }


        const rates = {};
        rates["INR"] = 1; // Base currency

        Object.keys(SUPPORTED_CURRENCIES).forEach(currencyCode => {
          if (currencyCode !== "INR" && data.rates[currencyCode]) {
            rates[currencyCode] = data.rates[currencyCode];
          }
        });

        localStorage.setItem(
          "exchangeRates",
          JSON.stringify({ rates, timestamp: new Date().getTime() })
        );

        setExchangeRates(rates);
      } catch (error) {
        console.error("Error fetching exchange rates:", error);
      
        setError("Failed to load currency conversion rates. Please try again later.");
      
        if (cached) {
          console.log("Using older cached rates as fallback");
          setExchangeRates(cached.rates);
        } else {
          setExchangeRates(null);
        }
      }

      setIsLoading(false);
    } catch (error) {
      console.error("Error in exchange rate handling:", error);
      setError("Failed to load currency conversion rates");
      setIsLoading(false);
    }
  };
  
  const convertPrice = (price) => {
    if (!price || typeof price !== "number") return price;
    if (!exchangeRates || !exchangeRates[selectedCurrency]) return price;
    if (selectedCurrency === "INR") return price;

    try {
      const rate = exchangeRates[selectedCurrency];
      return rate ? Number((price * rate).toFixed(2)) : price;
    } catch (err) {
      console.error("Price conversion error:", err);
      return price;
    }
  };

  const formatPrice = (price) => {
    const convertedPrice = convertPrice(price);

    if (typeof convertedPrice !== "number")
      return `${SUPPORTED_CURRENCIES[selectedCurrency]?.symbol || "$"}0.00`;

    try {
      return new Intl.NumberFormat(getLocaleFromCurrency(selectedCurrency), {
        style: "currency",
        currency: selectedCurrency,
      }).format(convertedPrice);
    } catch (err) {
      return `${
        SUPPORTED_CURRENCIES[selectedCurrency]?.symbol || "$"
      }${convertedPrice.toFixed(2)}`;
    }
  };

  const getLocaleFromCurrency = (currency) => {
    const localeMap = {
      INR: "en-IN",
      USD: "en-US",
      GBP: "en-GB",
      EUR: "de-DE",
      JPY: "ja-JP",
      AUD: "en-AU",
      CAD: "en-CA",
      SGD: "en-SG",
      MYR: "ms-MY",
      NPR: "ne-NP",
      IDR: "id-ID",
      THB: "th-TH",
      PHP: "fil-PH",
      VND: "vi-VN",
      KRW: "ko-KR",
    };
    return localeMap[currency] || "en-US";
  };

  const setUserCurrencyFromCountry = (country) => {
    if (country && countryCurrencyMap[country]) {
      const currencyCode = countryCurrencyMap[country];
      if (currencyCode && SUPPORTED_CURRENCIES[currencyCode]) {
        setSelectedCurrency(currencyCode);
        localStorage.setItem('selectedCurrency', currencyCode);
      }
    }
  };

  useEffect(() => {
    const storedCountry = localStorage.getItem('userCountry');
    if (storedCountry) {
      setUserCountry(storedCountry);
    }
    
    fetchCountriesAndCurrencies();
    fetchExchangeRates();
    
    const savedCurrency = localStorage.getItem('selectedCurrency');
    if (savedCurrency && SUPPORTED_CURRENCIES[savedCurrency]) {
      setSelectedCurrency(savedCurrency);
    }
    
    const interval = setInterval(fetchExchangeRates, 24 * 60 * 60 * 1000);
    return () => clearInterval(interval);
  }, []);

  useEffect(() => {
    if (userCountry && countryCurrencyMap[userCountry]) {
      setUserCurrencyFromCountry(userCountry);
    }
  }, [userCountry, countryCurrencyMap]);

  const value = {
    selectedCurrency,
    setSelectedCurrency,
    convertPrice,
    formatPrice,
    isLoading,
    error,
    SUPPORTED_CURRENCIES,
    refreshRates: fetchExchangeRates,
    allCountries,
    setUserCountry,
    userCountry
  };

  return (
    <CurrencyContext.Provider value={value}>
      {children}
    </CurrencyContext.Provider>
  );
};

export const useCurrency = () => {
  const context = useContext(CurrencyContext);
  if (!context) {
    throw new Error('useCurrency must be used within a CurrencyProvider');
  }
  return context;
};