One of the things I like a lot about most civ games is the diplomacy they have when talking to other country/nation.
So, diplomacy on those games works, why not here, tho the detail will have to get fine tuned.
Declare war
The war can follow the details CJ already made. A pros and cons of rivalry will start between them for the war duration. A country under vassalage to another country can start a war against their Overlord, during that time, any country that Guarantee Independence for your country will help with the war.
http://www.piratesglory.com/forums/viewtopic.php?f=4&t=3607
Offer a trade agreement
Allows the negotiation of a one-time deal. Gold, Info, pacts, cheaper resources(Wood, Iron, Cotton) for deal nation for 30 days. A 3 days vote on both nation will begin. If one disagrees, the deal is off. Cooldown of 7 days.
Form Defensive Pact
If either country is attacked, the other will be drawn into the war as defender. A 5 days vote on both nation will begin. If one disagrees, pact are not made. Cooldown of 8 days.
Form Non-Aggression Pact
Empires will not be able to declare war upon another for as long as the pact holds. A 5 days vote on both nation will begin. If one disagrees, pact are not made. Cooldown of 8 days.
Guarantee Independence
Unilateral version of Defense Pact. The proposing country will come to the target country's defense, if a country is a target of a vassalisation war. Instant
Close Borders
Borders are open by default unless closed explicitly. This is the option to do so. If any fleet of the other nation goes into your port, they gain +16 Hostility to your nation and +2% Damage to all the ships on the fleet. A 4 days vote on your nation will begin. After 2 days, the target nation will be warned of this.Limit of Close Borders is 5. No cooldown.
Declare Rivalry
Instantly gives +3000 hostility to the other country's players when this begin and if you join the country. Includes Closing the border towards Rival. Gains 50% more fame for each battle between the players of each country. Cannot be lifted for 30 days after declaration. Limit of Rivalries is 3. Instantly -2750 hostility to the other country's players if you leave the nation or rivalry is lifted. Instant, 50% fame bonus only applies after 3 days.
No cooldown.
Demand Vassalisation
Turns the country into a Vassal. 25% of their daily incomes goes to the Overlord. Can be forced via Warfare. Vassals are drawn into all Wars of their Overlord. If the target country disagrees, a war between them will start. A 8 days vote on the target nation will start. Cooldown of 10 days.
Offer Vassalisation
Allows a Empire to propose becoming a Vassal. A 8 days vote will start. Cooldown of 8 days.
Demand Tribute
Target country will pay 50% of its daily income to source country for 3 days. Source country will not be able to attack target, but is also not required to defend it for 30 days. A 5 day vote on the country will start. Cooldown of 10 days.
Offer Tribute
Proposes that the player country becomes a Tributary of the Target country. A 5 days vote on the target nation will start. Cooldown of 10 days.
Form Federation
Forms a new Federation with the Target country. Can't attack each other, similar to that of guildmates to guildmates, can't cast on each other. A 3 Days vote between each other will start. If one disagrees, the federation is not formed. A Defensive Pact is formed between them. Max of 4 country in a Federation.
Creates a new Federation that can be edited at the bottom of the court page. Only kings/queens of the countries can edit the name and the description of the Federation.
Ask to join Federation
Requests to join an already existing Federation. Max of 4 country in a Federation. Cooldown of 8 days.
To be able to do diplomacy, both nation must at least have 2 owned ports. Except for,
Guarantee Independence
Demand Vassalisation
Offer Vassalisation
Demand Tribute
Offer Tribute
Which needs both country to at least have one owned port.
If a country suddenly have no more ports but the deals are still active, they have a 15 days delay before the deals are destroyed automatically.
In Tribute, all the nation treasury will go to the source country in 15 days.