var RemixDebug = require('remix-debug-debugtest');
var CmdLine = RemixDebug.CmdLine;
var DebuggerManager = require('./debugger_manager.js');

class TransactionDebugger {
  constructor(embark, _options) {
    const self = this;
    this.embark = embark;

    this.debugger_manager = new DebuggerManager("http://localhost:8545");
    embark.events.on('contracts:compile:solc', this.debugger_manager.setInputJson.bind(this.debugger_manager));
    embark.events.on('contracts:compiled:solc', this.debugger_manager.setOutputJson.bind(this.debugger_manager));

    this.tx_tracker = {};
    this.last_tx = "";

    this.isDebugging = false;
    this.listenToEvents();
    this.listenToCommands();
    this.listentoAPI();
  }

  listenToEvents() {
    const self = this;
    this.embark.events.on('blockchain:tx', (tx) => {
      this.embark.events.request("contracts:contract", tx.name, (contract) => {
        self.tx_tracker[tx.transactionHash] = {tx: tx, contract: contract};
        self.last_tx = tx.transactionHash;
        if (tx.status !== '0x0') return;

        self.embark.logger.info("Transaction failed");

        self.debugger_manager.getLastLine(tx.transactionHash, contract.filename, (lines, line, known_vars) => {
          lines.forEach((line) => {
            self.embark.logger.error(line);
          });

					self.find_vars_in_line(tx.transactionHash, line, known_vars, (found_vars) => {
						if (!found_vars) return;
						self.embark.logger.info("vars:");
						found_vars.forEach((variable) => {
							self.embark.logger.info(`${variable.name}: ${variable.value}`);
						});
					});
        });
      });
    });
  }

	find_vars_in_line(txHash, line, known_vars, cb) {
		let found_vars = [];
		this.getGlobals(txHash, (err, globals) => {
			if (err) return cb([]);
			for (let variable in globals) {
        let value = globals[variable];
				if (line.indexOf(variable) >= 0) {
          found_vars.push({name: variable, value: value});
				}
			}

			for (let variable in known_vars.locals) {
        let value = known_vars.locals[variable];
        let variable_name = variable.split(' ')[0];
				if (line.indexOf(variable_name) >= 0) {
          found_vars.push({name: variable, value: value});
				}
			}

			for (let variable in known_vars.contract) {
        let value = known_vars.contract[variable];
        let variable_name = variable.split(' ')[0];
				if (line.indexOf(variable_name) >= 0) {
          found_vars.push({name: variable, value: value});
				}
			}

      cb(found_vars);
    });
  }

  listentoAPI() {
    this.debuggerData = {};
    this.apiDebugger = false;

    this.embark.registerAPICall('post', '/embark-api/debugger/start', (req, res) => {
      let txHash = req.body.params.txHash;

      this.embark.events.request("contracts:contract:byTxHash", txHash, (err, contract) => {
        if (err) {
          this.embark.logger.error(err);
          return res.send({error: err});
        }

        let filename = contract.filename;

        this.apiDebugger = this.debugger_manager.createDebuggerSession(txHash, filename, () => {
					this.getGlobals(txHash, (err, globals) => {
						if (err) return res.send({ok: false});
						this.debuggerData.globals = globals;
						res.send({ok :true});
					});
        });
      });
    });

    this.embark.registerAPICall('post', '/embark-api/debugger/JumpBack', (req, res) => {
      this.apiDebugger.stepJumpNextBreakpoint();
      res.send({ok :true});
    });
    this.embark.registerAPICall('post', '/embark-api/debugger/JumpForward', (req, res) => {
      this.apiDebugger.stepJumpPreviousBreakpoint();
      res.send({ok :true});
    });
    this.embark.registerAPICall('post', '/embark-api/debugger/StepOverForward', (req, res) => {
      this.apiDebugger.stepOverForward(true);
      res.send({ok :true});
    });
    this.embark.registerAPICall('post', '/embark-api/debugger/StepOverBackward', (req, res) => {
      this.apiDebugger.stepOverBack(true);
      res.send({ok :true});
    });
    this.embark.registerAPICall('post', '/embark-api/debugger/StepIntoForward', (req, res) => {
      this.apiDebugger.stepIntoForward(true);
      res.send({ok :true});
    });
    this.embark.registerAPICall('post', '/embark-api/debugger/StepIntoBackward', (req, res) => {
      this.apiDebugger.stepIntoBack(true);
      res.send({ok :true});
    });
    this.embark.registerAPICall('post', '/embark-api/debugger/breakpoint', (req, res) => {
      console.dir("new breakpoint");
      res.send({ok :true});
    });

    this.embark.registerAPICall('ws', '/embark-api/debugger', (ws, _req) => {
      if (!this.apiDebugger) return;

      this.apiDebugger.events.on("source", (lineColumnPos, rawLocation) => {
        this.debuggerData.sources = {lineColumnPos, rawLocation};
        ws.send(JSON.stringify(this.debuggerData), () => {});
      });

			this.apiDebugger.events.on("locals", (data) => {
				this.debuggerData.locals = this.simplifyDebuggerVars(data);
				ws.send(JSON.stringify(this.debuggerData), () => {});
			});

      this.apiDebugger.events.on("globals", (data) => {
        this.debuggerData.contract = this.simplifyDebuggerVars(data);
        ws.send(JSON.stringify(this.debuggerData), () => {});
      });
    });
  }

  simplifyDebuggerVars(data) {
    let new_data = {};

    for (let key in data) {
      let field = data[key];
      new_data[`${key} (${field.type})`] = field.value;
    }

    return new_data;
  }

  listenToCommands() {
    const self = this;
    this.cmdDebugger = false;
		this.currentCmdTxHash = "";

    this.embark.registerConsoleCommand((cmd, _options) => {
      let cmdName = cmd.split(" ")[0];
      let txHash = cmd.split(" ")[1];
      return {
        match: () => cmdName === 'debug',
        process: (cb) => {
          if (txHash) {
            this.embark.events.request("contracts:contract:byTxHash", txHash, (err, contract) => {
              if (err) {
                this.embark.logger.error(err);
                return;
              }
              let filename = contract.filename;
							self.currentCmdTxHash = txHash;
              self.cmdDebugger = self.debugger_manager.createDebuggerSession(txHash, filename, () => {
                self.cmdDebugger.getSource().forEach((line) => {
                  console.dir(line);
                });
              });
            });
            return;
          }
					self.currentCmdTxHash = self.last_tx;
          let filename = self.tx_tracker[self.last_tx].contract.filename;
          self.cmdDebugger = self.debugger_manager.createDebuggerSession(self.last_tx, filename, () => {
            self.cmdDebugger.getSource().forEach((line) => {
              console.dir(line);
            });
          });
        }
      };
    });

    this.embark.registerConsoleCommand((cmd, _options) => {
      return {
        match: () => (cmd === 'next' || cmd === 'n'),
        process: (cb) => {
          if (!self.cmdDebugger.currentStep()) {
            console.dir("end of execution reached");
            return self.cmdDebugger.unload();
          }
          self.cmdDebugger.stepOverForward(true);
          self.cmdDebugger.getSource().forEach((line) => {
            console.dir(line);
          });
        }
      };
    });

    this.embark.registerConsoleCommand((cmd, _options) => {
      return {
        match: () => (cmd === 'previous' || cmd === 'p'),
        process: (cb) => {
          if (!self.cmdDebugger.currentStep()) {
            console.dir("end of execution reached");
            return self.cmdDebugger.unload();
          }
          self.cmdDebugger.stepOverBack(true);
          self.cmdDebugger.getSource().forEach((line) => {
            console.dir(line);
          });
        }
      };
    });

    this.embark.registerConsoleCommand((cmd, _options) => {
      return {
        match: () => (cmd === 'var local' || cmd === 'v l' || cmd === 'vl'),
        process: (cb) => {
          self.cmdDebugger.displayLocals();
        }
      };
    });

    this.embark.registerConsoleCommand((cmd, _options) => {
      return {
        match: () => (cmd === 'var global' || cmd === 'v g' || cmd === 'vg'),
        process: (cb) => {
          self.cmdDebugger.displayGlobals();
        }
      };
    });

    this.embark.registerConsoleCommand((cmd, _options) => {
      return {
        match: () => (cmd === 'var all' || cmd === 'v a' || cmd === 'va'),
        process: (cb) => {

					self.getGlobals((err, globals) => {
						if (err) return self.embark.logger.error(err);
	          console.dir(globals);
					});
        }
      };
    });
  }

	getGlobals(txHash, cb) {
		let globals = {};
		this.embark.events.request("blockchain:getTransaction", txHash, (err, tx) => {
			if (err) return cb(err);

			this.embark.events.request("blockchain:block:byHash", tx.blockHash, (err, block) => {
				if (err) return cb(err);

				globals["block.blockHash"] = tx.blockHash;
				globals["block.number"] = tx.blockNumber;
				globals["block.coinbase"] = block.miner;
				globals["block.difficulty"] = block.difficulty;
				globals["block.gaslimit"] = block.gasLimit;
				globals["block.timestamp"] = block.timestamp;
				globals["msg.sender"] = tx.from;
				globals["msg.gas"] = tx.gas;
				globals["msg.gasPrice"] = tx.gasPrice;
				globals["msg.value"] = tx.value;
				globals["now"] = block.timestamp;

				cb(null, globals);
			});
		});
	}

}

module.exports = TransactionDebugger;