/*global web3*/
import React from 'react';
import ContractContext from './contract-context';
import PropTypes from 'prop-types';

class Function extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      onRequest: false,
      fields: {},
      methodFields: {
        from: '',
        to: '',
        value: 0,
        data: '',
        gasLimit: '7000000'
      },
      receipt: null
    };

    this.handleParameterChange = this.handleParameterChange.bind(this);
    this.handleMethodFieldChange = this.handleMethodFieldChange.bind(this);
    this.handleClick = this.handleClick.bind(this);
  }


  copyCommand(e) {
    e.preventDefault();

    let functionLabel = this._getFunctionLabel();
    let functionParams = this._getFunctionParamString();
    let methodParams = this._getMethodString();
    if (this.props.abi.type === "constructor") functionParams = `{arguments: [${functionParams}]}`;

    const command = `await ${functionLabel}(${functionParams})${this.props.abi.type !== 'fallback' ? '.' + this._getMethodType() : ''}${methodParams}`;

    var dummy = document.createElement("input");
    document.body.appendChild(dummy);
    dummy.setAttribute('value', command);
    dummy.select();
    document.execCommand("copy");
    document.body.removeChild(dummy);
  }


  async handleClick(e, instanceUpdateCallback) {
    e.preventDefault();

    this.setState({onRequest: true, receipt: null});

    this.props.resultHandler(false, null, null);

    let executionParams = {
      from: this.state.methodFields.from,
      gasLimit: this.state.methodFields.gasLimit
    };

    if (this.props.abi.payable) executionParams.value = this.state.methodFields.value;

    if (this.props.abi.type === 'fallback') {
      executionParams.data = this.state.methodFields.data;
      executionParams.to = this.props.contract.options.address;
    }

    let fields = this.state.fields;

    let functionLabel = this._getFunctionLabel();
    let functionParams = this._getFunctionParamString();
    let methodParams = this._getMethodString();
    if (this.props.abi.type === "constructor") functionParams = `{arguments: [${functionParams}]}`;

    console.log(`%cawait ${functionLabel}(${functionParams})${this.props.abi.type !== 'fallback' ? '.' + this._getMethodType() : ''}${methodParams}`, 'font-weight: bold');

    let _receipt;

    try {
      if (this.props.abi.type === 'constructor') {
        let contractInstance = await this.props.contract.deploy({arguments: Object.keys(fields).map(val => fields[val])}).send(executionParams);
        instanceUpdateCallback(contractInstance.options.address);
        this.setState({onRequest: false});
        console.log(contractInstance.options.address);
        this.props.resultHandler(false, 'New instance: ' + contractInstance.options.address);
      } else {

        if (this.props.abi.type === 'fallback') _receipt = await web3.eth.sendTransaction(executionParams);
        else _receipt = await this.props.contract
          .methods[this.props.abi.name + '(' + this.props.abi.inputs.map(input => input.type).join(',') + ')']
          .apply(null, Object.keys(fields).map(val => {
            let input = this.props.abi.inputs.filter(x => x.name === val)[0];
            return input.type.indexOf('bool') === -1 ? fields[val] : (fields[val].toLowerCase() === 'true');
          }))[this._getMethodType()](executionParams);

        if (this._getMethodType() === 'call') {
          this.props.resultHandler(false, _receipt, null);
        } else {
          this.props.resultHandler(false, null, _receipt);
        }

        this.setState({onRequest: false, receipt: _receipt});
        console.log(_receipt);
      }


    } catch (err) {
      console.error('%s: %s', err.name, err.message);
      this.setState({onRequest: false});
      this.props.resultHandler(true, err.name + ": " + err.message, _receipt);
    }
  }

  handleParameterChange(e) {
    let newState = this.state;
    newState.fields[e.target.getAttribute('data-name')] = e.target.value;
    this.setState(newState);
  }

  handleMethodFieldChange(e) {
    let newState = this.state;
    newState.methodFields[e.target.getAttribute('data-param')] = e.target.value;

    if (e.target.getAttribute('data-param') === 'from') {
      newState.selectedAccount = e.target.options[e.target.selectedIndex].text;
    }
    this.setState(newState);
  }

  _getFunctionLabel() {
    if (this.props.abi.type === 'function') if (!this.props.duplicated) return `${this.props.contractName}.methods.${this.props.abi.name}`;
    else {
      return `${this.props.contractName}.methods['${this.props.abi.name + '(' + (this.props.abi.inputs !== null ? this.props.abi.inputs.map(input => input.type).join(',') : '') + ')'}']`;
    }
    else if (this.props.abi.type === 'fallback') {
      return `web3.eth.sendTransaction`;
    }
    else return `${this.props.contractName}.deploy`;
  }

  _getMethodType() {
    return (this.props.abi.constant === true || this.props.abi.stateMutability === 'view' || this.props.abi.stateMutability === 'pure') ? 'call' : 'send';
  }

  _getMethodFields(accounts) {
    return <React.Fragment>
      from: <select data-param="from" disabled={accounts.length === 0} value={this.state.from}
                    onChange={this.handleMethodFieldChange}>
      <option>-</option>
      {
        accounts.map(function(item, i) {
          return <option key={i} value={item}>{`accounts[${i}]`}</option>;
        })
      }
    </select>
      {this.props.abi.payable &&
      <span>, value:
            <input type="text" data-param="value" value={this.state.methodFields.value} size="6"
                   onChange={this.handleMethodFieldChange}/>
        </span>
      }
      {this._getMethodType() === 'send' &&
      <span>, gasLimit:
          <input type="text" data-param="gasLimit" value={this.state.methodFields.gasLimit} size="6"
                 onChange={this.handleMethodFieldChange}/>
      </span>}
      {this._getMethodType() === 'send' && this.props.abi.type === 'fallback' &&
      <span>, data:
          <input type="text" data-param="data" value={this.state.methodFields.data} size="6"
                 onChange={this.handleMethodFieldChange}/>
      </span>}
    </React.Fragment>;
  }


  _getFunctionParamFields() {
    return <React.Fragment>
      {
        this.props.abi.inputs
          .map((input, i) => <input key={i} type="text" data-var-type={input.type} data-type="inputParam"
                                    data-name={input.name} placeholder={input.name}
                                    title={input.type + ' ' + input.name} size={input.name.length}
                                    value={this.state.fields[input.name] || ''} onChange={this.handleParameterChange}/>)
          .reduce((accu, elem) => {
            return accu === null ? [elem] : [...accu, ', ', elem];
          }, null)
      }
    </React.Fragment>;
  }

  _getFunctionParamString() {
    if (this.props.abi.type === 'fallback') return '';
    return this.props.abi.inputs
      .map((input, _i) => (input.type.indexOf('int') === -1 && input.type.indexOf('bool') === -1 ? '"' : '') + (this.state.fields[input.name] || (input.type.indexOf('int') === -1 ? '' : '0')) + (input.type.indexOf('int') === -1 ? '"' : ''))
      .join(', ');
  }

  _getMethodString(_elem) {
    let methodParams = "({";

    methodParams += `from: ` + (this.state.selectedAccount || '"0x00"');
    if (this._getMethodType() === 'send') {
      methodParams += ', gasLimit: ' + (this.state.methodFields.gasLimit || 0);
      if (this.props.abi.payable) {
        methodParams += ', value: ' + (this.state.methodFields.value || 0);
      }
      if (this.props.abi.type === 'fallback') {
        methodParams += ', data: "' + (this.state.methodFields.data || '"0x00"') + '", to: "' + (this.state.methodFields.to || '"0x00"') + '"';
      }
    }
    return methodParams + "})";
  }

  render() {

    let btnClass = "btn ml-auto ";
    let disabled = false;

    if (this.state.onRequest) {
      disabled = true;
    }

    if (this.props.definition.code === "") {
      btnClass += "btn-secondary";
      disabled = true;
    } else {
      btnClass += "btn-primary";
    }

    let requestResult;
    if (this.state.onRequest) {
      requestResult = <img src="../assets/images/loading.gif" className="loading" alt=""/>;
    } else {
      requestResult = this.props.definition.code === "" ? <React.Fragment>_</React.Fragment>: <React.Fragment>&#9166;</React.Fragment>;
    }

    return <ContractContext.Consumer>
      {(context) => (
        <React.Fragment>
          <div className="col-md-11">
            <code>
              await {this._getFunctionLabel()}
              {this.props.abi.type !== 'fallback' ? '(' : ''}
              {this.props.abi.type !== 'fallback' ? this._getFunctionParamFields() : ''}
              {this.props.abi.type !== 'fallback' ? ')' : ''}
              {this.props.abi.type !== 'fallback' ? '.' + this._getMethodType() : ''}
              ({this._getMethodFields(context.accounts)})
            </code>
          </div>
          <div className="col-md-1">
            <button className={btnClass}
                    title={this.props.definition.code === "" ? "Can't execute function" : "Execute function"}
                    onClick={event => this.handleClick(event, context.updateInstances)} disabled={disabled}>
              {requestResult}
            </button>
          </div>
        </React.Fragment>
      )}
    </ContractContext.Consumer>;
  }
}

Function.propTypes = {
  definition: PropTypes.object,
  abi: PropTypes.object,
  contract: PropTypes.object,
  resultHandler: PropTypes.func,
  duplicated: PropTypes.bool,
  contractName: PropTypes.string
};

export default Function;