Node.js combat logic

Building a textbased game where players can fight in an arena. I want someone to write the battle logic for the game, it need to take check how many players are in each team, 1v1, 2v2, 3v3 or 5v5. Or even a 2v2v2, or a free for all fight. When the battle type has been identified, a combat loop will take place. This includes check-in if a player hits or miss, if enemy parried the attack or not, if it was a hit it also needs to deal damage to the enemy. The different fighting styles can be dualwield(one-handed weapons in two hands), twohander or a one-hander + shield, but also need's a check if someone joins a battle with no weapons equipped or only a shield. The battle has to be stored in a battle log, to then be saved to a DB and also displayed for the user to see how the match whent. An example of a fight can be seen in attachment, and more information will be handed out when I find someone interested. Also an example site can be shown to see how it all should work.