import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:url_launcher/url_launcher.dart';

class TransactionsPage extends StatefulWidget {
  TransactionsPage({Key? key, required this.uuid, required this.wallet})
      : super(key: key);

  final String uuid;
  String wallet;

  @override
  _TransactionsPageState createState() => _TransactionsPageState();
}

class _TransactionsPageState extends State<TransactionsPage> {
  @override
  void initState() {
    super.initState();
    fetchTransactions();
  }

  List<Transaction> transactions = [];

  Future<void> fetchTransactions() async {
    // Fetch domains from api
    final response = await http.get(Uri.parse(
        'https://api.firewallet.au/wallet/transactions?uuid=${widget.uuid}&name=${widget.wallet}'));
    if (response.statusCode == 200) {
      final data = jsonDecode(response.body);
      if (data is Map && data.containsKey('error')) {
        print('Error: ${data['error']}');
        return;
      }
      // Return if empty
      if (data.isEmpty) {
        setState(() {
          transactions = [
            Transaction(
                confirmations: 0,
                date: 'No transactions found',
                hash: 'No transactions found',
                inputs: [],
                outputs: [])
          ];
        });

        return;
      }

      final txData = data as List;
      setState(() {
        transactions = txData
            .map(
              (tx) => Transaction(
                confirmations: tx['confirmations'],
                date: tx['date'],
                hash: tx['hash'],
                inputs: (tx['inputs'] as List<dynamic>).map<TXInput>((input) {
                  return TXInput(
                      address: input['address'],
                      value: input['value'],
                      path: input['path'] == null
                          ? Path()
                          : Path(
                              account: input['path']['account'],
                              change: input['path']['change'],
                              derivation: input['path']['derivation'],
                              name: input['path']['name'],
                            ));
                }).toList(),
                outputs:
                    (tx['outputs'] as List<dynamic>).map<TXOutput>((output) {
                  return TXOutput(
                    address: output['address'],
                    value: output['value'],
                    covenant: Covenant(
                        action: output['covenant']['action'],
                        type: output['covenant']['type'],
                        items: List<String>.from(output['covenant']['items'])),
                    path: output['path'] == null
                        ? Path()
                        : Path(
                            account: output['path']['account'],
                            change: output['path']['change'],
                            derivation: output['path']['derivation'],
                            name: output['path']['name'],
                          ),
                  );
                }).toList(),
              ),
            )
            .toList();
      });
      print(transactions[0].hash);
      print(transactions[0].value().toStringAsFixed(2));
    } else {
      // Handle error
      print('Failed to load wallet names');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('${widget.wallet} - Transactions'),
        // Add refresh button to the app bar
        actions: <Widget>[
          IconButton(
            icon: Icon(Icons.refresh),
            onPressed: fetchTransactions,
          ),
        ],
      ),
      // Get wallet list from api and display here
      body: Center(
        child: LayoutBuilder(
          builder: (BuildContext context, BoxConstraints constraints) {
            return ListView(
              children: <Widget>[
                ...transactions.map((tx) {
                  return Card(
                    child: ListTile(
                        title: Text(tx.toString()),
                        subtitle: Text(tx.hash),
                        trailing: Text('${tx.value().toStringAsFixed(2)} HNS'),
                        onTap: // Open tx in browser
                            () => openTX(tx.hash)),
                  );
                }),
              ],
            );
          },
        ),
      ),
    );
  }

  Future<void> openTX(String hash) async {
    // Open the transaction in the browser
    final Uri url = Uri.parse('https://hns.cymon.de/tx/$hash');
    if (!await launchUrl(url)) {
      throw Exception('Could not launch $url');
    }
  }
}

class Transaction {
  final int confirmations;
  final String date;
  final String hash;
  final List<TXInput> inputs;
  final List<TXOutput> outputs;
  double totalValue = 0;
  bool valueCalculated = false;

  Transaction(
      {required this.confirmations,
      required this.date,
      required this.hash,
      required this.inputs,
      required this.outputs});

  // Calculate the total value of the transaction
  double value() {
    if (valueCalculated) {
      return totalValue / 1000000;
    }
    totalValue = inputs.fold(0, (prev, input) => prev + input.getValue());
    totalValue += outputs.fold(0, (prev, output) => prev + output.getValue());
    valueCalculated = true;
    return totalValue / 1000000;
  }

  @override
  String toString() {
    if (inputs.isEmpty) {
      return 'No Transactions Found';
    }

    int opens = 0;
    int bids = 0;
    int reveals = 0;
    int redeems = 0;
    int registers = 0;
    int updates = 0;
    int transfers = 0;
    int finalizes = 0;
    int renews = 0;
    int revokes = 0;
    int other = 0;

    outputs.forEach((output) {
      if (output.covenant.action == 'OPEN') {
        opens++;
      } else if (output.covenant.action == 'BID') {
        bids++;
      } else if (output.covenant.action == 'REVEAL') {
        reveals++;
      } else if (output.covenant.action == 'REDEEM') {
        redeems++;
      } else if (output.covenant.action == 'REGISTER') {
        registers++;
      } else if (output.covenant.action == 'UPDATE') {
        updates++;
      } else if (output.covenant.action == 'TRANSFER') {
        transfers++;
      } else if (output.covenant.action == 'FINALIZE') {
        finalizes++;
      } else if (output.covenant.action == 'RENEW') {
        renews++;
      } else if (output.covenant.action == 'REVOKE') {
        revokes++;
      } else if (output.covenant.action == 'NONE') {
        other++;
      } else {
        other++;
        print('Unknown action: ${output.covenant.action}');
      }
    });

    String outputString = '';
    if (opens > 0) {
      outputString += 'Opens: $opens, ';
    }
    if (bids > 0) {
      outputString += 'Bids: $bids, ';
    }
    if (reveals > 0) {
      outputString += 'Reveals: $reveals, ';
    }
    if (redeems > 0) {
      outputString += 'Redeems: $redeems, ';
    }
    if (registers > 0) {
      outputString += 'Registers: $registers, ';
    }
    if (updates > 0) {
      outputString += 'Updates: $updates, ';
    }

    if (transfers > 0) {
      outputString += 'Transfers: $transfers, ';
    }

    if (finalizes > 0) {
      outputString += 'Finalizes: $finalizes, ';
    }

    if (renews > 0) {
      outputString += 'Renews: $renews, ';
    }
    if (revokes > 0) {
      outputString += 'Revokes: $revokes, ';
    }

    // Remove trailing comma
    if (outputString.isNotEmpty) {
      outputString = outputString.substring(0, outputString.length - 2);
    }

    if (outputString.isEmpty) {
      // Check if sent or received
      if (value() > 0) {
        outputString = 'Received HNS';
      } else {
        outputString = 'Sent HNS';
      }
    }

    return outputString;
  }
}

class TXInput {
  final String address;
  final int value;
  final Path path;

  TXInput({required this.address, required this.value, required this.path});

  int getValue() {
    if (path.userPath()) {
      return value * -1;
    }
    return value;
  }
}

class TXOutput {
  final String address;
  final int value;
  final Covenant covenant;
  final Path path;

  TXOutput(
      {required this.address,
      required this.value,
      required this.covenant,
      required this.path});

  int getValue() {
    if (path.userPath()) {
      if (covenant.action == 'BID') {
        return 0;
      }

      return value;
    }
    return 0;
  }
}

class Covenant {
  final String action;
  final int type;
  final List<String> items;

  Covenant({required this.action, required this.type, required this.items});
}

class Path {
  int? account;
  bool? change;
  String? derivation;
  String? name;

  Path({this.account, this.change, this.derivation, this.name});

  @override
  String toString() {
    if (name == null) {
      return 'No Path Found';
    }
    if (derivation == null) {
      return 'Path(name: $name)';
    }

    return 'Path(account: $account, change: $change, derivation: $derivation, name: $name)';
  }

  bool userPath() {
    return derivation != null;
  }
}