let toposort = require('toposort');
let async = require('async');
const cloneDeep = require('clone-deep');

let utils = require('../utils/utils.js');

// TODO: create a contract object

class ContractsManager {
  constructor(options) {
    const self = this;
    this.contractFiles = options.contractFiles;
    this.contractsConfig = cloneDeep(options.contractsConfig || {});
    this.contracts = {};
    this.logger = options.logger;
    this.plugins = options.plugins;
    this.contractDependencies = {};
    this.gasLimit = options.gasLimit;
    this.deployOnlyOnConfig = false;
    this.events = options.events;
    this.compileError = false;

    self.events.setCommandHandler('contracts:list', (cb) => {
      cb(self.compileError, self.listContracts());
    });

    self.events.setCommandHandler('contracts:all', (cb) => {
      cb(self.compileError, self.contracts);
    });

    self.events.setCommandHandler('contracts:dependencies', (cb) => {
      cb(self.compileError, self.contractDependencies);
    });

    self.events.setCommandHandler("contracts:contract", (contractName, cb) => {
      cb(self.getContract(contractName));
    });

    self.events.setCommandHandler("contracts:build", (configOnly, cb) => {
      self.deployOnlyOnConfig = configOnly; // temporary, should refactor
      self.build((err) => {
        cb(err);
      });
    });

    self.events.setCommandHandler("contracts:reset:dependencies", (cb) => {
      for (let className in self.contracts) {
        self.contracts[className].dependencyCount = null;
      }
      self.contractDependencies = {};
      cb();
    });

    self.events.on("deploy:contract:error", (_contract) => {
      self.events.emit('contractsState', self.contractsState());
    });

    self.events.on("deploy:contract:deployed", (_contract) => {
      self.events.emit('contractsState', self.contractsState());
    });

    self.events.on("deploy:contract:undeployed", (_contract) => {
      self.events.emit('contractsState', self.contractsState());
    });

  }

  build(done) {
    let self = this;
    self.contracts = {};
    async.waterfall([
      function loadContractFiles(callback) {
        self.events.request("config:contractsFiles", (contractsFiles) => {
          self.contractsFiles = contractsFiles;
          callback();
        });
      },
      function loadContractConfigs(callback) {
        self.events.request("config:contractsConfig", (contractsConfig) => {
          self.contractsConfig = cloneDeep(contractsConfig);
          callback();
        });
      },
      function compileContracts(callback) {
        self.events.emit("status", __("Compiling..."));
        if (process.env.isTest && self.compiledContracts && Object.keys(self.compiledContracts).length) {
          // Only compile once for tests
          return callback();
        }
        self.events.request("compiler:contracts", self.contractFiles, function (err, compiledObject) {
          self.compiledContracts = compiledObject;
          callback(err);
        });
      },
      function prepareContractsFromConfig(callback) {
        self.events.emit("status", __("Building..."));
        let className, contract;
        for (className in self.contractsConfig.contracts) {
          contract = self.contractsConfig.contracts[className];

          contract.className = className;
          contract.args = contract.args || [];

          self.contracts[className] = contract;
        }
        callback();
      },
      function getGasPriceForNetwork(callback) {
        return callback(null, self.contractsConfig.gasPrice);
      },
      function prepareContractsFromCompilation(gasPrice, callback) {
        let className, compiledContract, contractConfig, contract;
        for (className in self.compiledContracts) {
          compiledContract = self.compiledContracts[className];
          contractConfig = self.contractsConfig.contracts[className];

          contract = self.contracts[className] || {className: className, args: []};

          contract.code = compiledContract.code;
          contract.runtimeBytecode = compiledContract.runtimeBytecode;
          contract.realRuntimeBytecode = (contract.realRuntimeBytecode || contract.runtimeBytecode);
          contract.swarmHash = compiledContract.swarmHash;
          contract.gasEstimates = compiledContract.gasEstimates;
          contract.functionHashes = compiledContract.functionHashes;
          contract.abiDefinition = compiledContract.abiDefinition;
          contract.filename = compiledContract.filename;

          contract.gas = (contractConfig && contractConfig.gas) || self.contractsConfig.gas || 'auto';

          contract.gasPrice = contract.gasPrice || gasPrice;
          contract.type = 'file';
          contract.className = className;

          self.contracts[className] = contract;
        }
        callback();
      },
      function setDeployIntention(callback) {
        let className, contract;
        for (className in self.contracts) {
          contract = self.contracts[className];
          contract.deploy = (contract.deploy === undefined) || contract.deploy;
          if (self.deployOnlyOnConfig && !self.contractsConfig.contracts[className]) {
            contract.deploy = false;
          }

          if (contract.code === "") {
            const message = __("assuming %s to be an interface", className);
            if (contract.silent) {
              self.logger.trace(message);
            } else {
              self.logger.info(message);
            }
            contract.deploy = false;
          }
        }
        callback();
      },
      /*eslint complexity: ["error", 11]*/
      function dealWithSpecialConfigs(callback) {
        let className, contract, parentContractName, parentContract;
        let dictionary = Object.keys(self.contracts);

        for (className in self.contracts) {
          contract = self.contracts[className];

          if (contract.instanceOf === undefined) {
            continue;
          }

          parentContractName = contract.instanceOf;
          parentContract = self.contracts[parentContractName];

          if (parentContract === className) {
            self.logger.error(__("%s : instanceOf is set to itself", className));
            continue;
          }

          if (parentContract === undefined) {
            self.logger.error(__("{{className}}: couldn't find instanceOf contract {{parentContractName}}", {className: className, parentContractName: parentContractName}));
            let suggestion = utils.proposeAlternative(parentContractName, dictionary, [className, parentContractName]);
            if (suggestion) {
              self.logger.warn(__('did you mean "%s"?', suggestion));
            }
            continue;
          }

          if (parentContract.args && parentContract.args.length > 0 && ((contract.args && contract.args.length === 0) || contract.args === undefined)) {
            contract.args = parentContract.args;
          }

          if (contract.code !== undefined) {
            self.logger.error(__("{{className}} has code associated to it but it's configured as an instanceOf {{parentContractName}}", {className: className, parentContractName: parentContractName}));
          }

          contract.code = parentContract.code;
          contract.runtimeBytecode = parentContract.runtimeBytecode;
          contract.gasEstimates = parentContract.gasEstimates;
          contract.functionHashes = parentContract.functionHashes;
          contract.abiDefinition = parentContract.abiDefinition;

          contract.gas = contract.gas || parentContract.gas;
          contract.gasPrice = contract.gasPrice || parentContract.gasPrice;
          contract.type = 'instance';

        }
        callback();
      },
      function removeContractsWithNoCode(callback) {
        let className, contract;
        let dictionary = Object.keys(self.contracts);
        for (className in self.contracts) {
          contract = self.contracts[className];

          if (contract.code === undefined) {
            self.logger.error(__("%s has no code associated", className));
            let suggestion = utils.proposeAlternative(className, dictionary, [className]);
            if (suggestion) {
              self.logger.warn(__('did you mean "%s"?', suggestion));
            }
            delete self.contracts[className];
          }
        }
        self.logger.trace(self.contracts);
        callback();
      },
      // TODO: needs refactoring, has gotten too complex
      /*eslint complexity: ["error", 16]*/
      /*eslint max-depth: ["error", 16]*/
      function determineDependencies(callback) {
        let className, contract;
        for (className in self.contracts) {
          contract = self.contracts[className];

          // look in code for dependencies
          let libMatches = (contract.code.match(/:(.*?)(?=_)/g) || []);
          for (let match of libMatches) {
              self.contractDependencies[className] = self.contractDependencies[className] || [];
              self.contractDependencies[className].push(match.substr(1));
          }

          // look in arguments for dependencies
          if (contract.args === []) continue;

          let ref;
          if (Array.isArray(contract.args)) {
            ref = contract.args;
          } else {
            let keys = Object.keys(contract.args);
            ref = keys.map((k) => contract.args[k]).filter((x) => !x);
          }

          for (let j = 0; j < ref.length; j++) {
            let arg = ref[j];
            if (arg[0] === "$") {
              self.contractDependencies[className] = self.contractDependencies[className] || [];
              self.contractDependencies[className].push(arg.substr(1));
              self.checkDependency(className, arg.substr(1));
            }
            if (Array.isArray(arg)) {
              for (let sub_arg of arg) {
                if (sub_arg[0] === "$") {
                  self.contractDependencies[className] = self.contractDependencies[className] || [];
                  self.contractDependencies[className].push(sub_arg.substr(1));
                  self.checkDependency(className, sub_arg.substr(1));
                }
              }
            }
          }

          // look in onDeploy for dependencies
          if (contract.onDeploy !== [] && contract.onDeploy !== undefined) {
            let regex = /\$\w+/g;
            contract.onDeploy.map((cmd) => {
              cmd.replace(regex, (match) => {
                self.contractDependencies[className] = self.contractDependencies[className] || [];
                self.contractDependencies[className].push(match.substr(1));
              });
            });
          }

          // Remove duplicates
          if (self.contractDependencies[className]) {
            const o = {};
            self.contractDependencies[className].forEach(function (e) {
              o[e] = true;
            });
            self.contractDependencies[className] = Object.keys(o);
          }
        }
        callback();
      },
      function setDependencyCount(callback) {
        let className;

        function getDependencyCount(contractName, cycleDetector) {
          if (!self.contracts[contractName]) {
            return 0;
          }
          if (self.contracts[contractName].dependencyCount || self.contracts[contractName].dependencyCount === 0) {
            // Already have that count
            return self.contracts[contractName].dependencyCount;
          }
          if (!self.contractDependencies[contractName] || !self.contractDependencies[contractName].length) {
            self.contracts[contractName].dependencyCount = 0;
            return 0;
          }
          let total = self.contractDependencies[contractName].length;
          self.contractDependencies[contractName].some(dependencyName => {
            if (cycleDetector.indexOf(dependencyName) > -1) {
              // We are in a cycle because of the dependency, set both to Infinity
              self.contracts[dependencyName].dependencyCount = Infinity;
              total = Infinity;
              return true;
            }
            cycleDetector.push(dependencyName);
            total += getDependencyCount(dependencyName, cycleDetector);
          });
          self.contracts[contractName].dependencyCount = total;
          return total;
        }

        let cycleDetector;
        for (className in self.contracts) {
          cycleDetector = [];
          getDependencyCount(className, cycleDetector);
        }
        callback();
      }
    ], function (err) {
      if (err) {
        self.compileError = true;
        self.events.emit("status", __("Compile/Build error"));
        self.logger.error(__("Error Compiling/Building contracts: ") + err);
      }else{
        self.compileError = false;
      }
      self.logger.trace("finished".underline);
      done(err, self);
    });
  }

  checkDependency(className, dependencyName) {
    if (!this.contractDependencies[className]) {
      return;
    }
    if (!this.contracts[dependencyName]) {
      this.logger.warn(__('{{className}} has a dependency on {{dependencyName}}', {className, dependencyName}) +
        __(', but it is not present in the contracts'));
      return;
    }
    if (!this.contracts[dependencyName].deploy) {
      this.logger.warn(__('{{className}} has a dependency on {{dependencyName}}', {className, dependencyName}) +
        __(', but it is not set to deploy. It could be an interface.'));
    }
  }

  getContract(className) {
    return this.contracts[className];
  }

  sortContracts(contractList) {
    let converted_dependencies = [], i;

    for (let contract in this.contractDependencies) {
      let dependencies = this.contractDependencies[contract];
      for (i = 0; i < dependencies.length; i++) {
        converted_dependencies.push([contract, dependencies[i]]);
      }
    }

    let orderedDependencies;

    try {
      orderedDependencies =  toposort(converted_dependencies.filter((x) => x[0] != x[1])).reverse();
    } catch(e) {
      this.logger.error((__("Error: ") + e.message).red);
      this.logger.error(__("there are two or more contracts that depend on each other in a cyclic manner").bold.red);
      this.logger.error(__("Embark couldn't determine which one to deploy first").red);
      throw new Error("CyclicDependencyError");
      //process.exit(0);
    }

    let newList = contractList.sort(function (a, b) {
      let order_a = orderedDependencies.indexOf(a.className);
      let order_b = orderedDependencies.indexOf(b.className);
      return order_a - order_b;
    });

    return newList;
  }

  // TODO: should be built contracts
  listContracts() {
    let contracts = [];
    for (let className in this.contracts) {
      let contract = this.contracts[className];
      contracts.push(contract);
    }
    return this.sortContracts(contracts);
  }

  contractsState() {
    let data = [];

    for (let className in this.contracts) {
      let contract = this.contracts[className];
      if (contract.silent) {
        continue;
      }

      let contractData;

      if (contract.deploy === false) {
        contractData = [
          className.green,
          __('Interface or set to not deploy').green,
          "\t\tn/a".green
        ];
      } else if (contract.error) {
        contractData = [
          className.green,
          (contract.error).split("\n")[0].replace(/Error: /g, '').substring(0, 32).red,
          '\t\tError'.red
        ];
      } else {
        contractData = [
          className.green,
          (contract.deployedAddress || '...').green,
          ((contract.deployedAddress !== undefined) ? ("\t\t" + __("Deployed")).green : ("\t\t" + __("Pending")).magenta)
        ];
      }

      data.push(contractData);
    }

    return data;
  }
}

module.exports = ContractsManager;