I agree with the idea that it is not easy to make a real trade with the villagers but at least the trade-o-mat could simulate the trades. As far as I know, IC2 has no direct interaction with the villagers.
Posts by Alpha_Seven
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Just let the Trade-O-Mat check the trade of the Villager and then use it!
This. The only question is if it is possible to do that with the current Forge versions.
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Basically the idea is making the Trade-o-Mats capable of trading with the villagers. The villagers see the Trade-o-Mat, when they are inside a certain radius (5 blocks maybe) they compare their offers with the Trade-o-Mat, and if the offers match, they make one transaction. After that, the Trade-o-Mat will not make new transactions for a short amount of time (to prevent emerald farming and discourage players of using this system as the exclusive trading mechanic, I think).
But I know the idea is not as easy as it sounds. First of all, it is needed to know how do the trading mechanics work in the code, and then, how the Trade-o-Mats could interact with the villagers, know the offers they have and make transactions when the offers match.
The offers match only if the following conditions are met:
1. The item selled/bought is the same between the villager and the Trade-o-Mat (a bit obvious)
2. The Trade-o-Mat must agree with the Villager in the price. If a Villager buys, by example, 20 wheat for one emerald, the trading only can be made if the Trade-o-Mat sells 20+ wheat for 1 emerald.That's it. Hope you like.