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+# Asteria dApp Design
+
+## Introduction
+This document describes the technical design of the Asteria dApp - the script UTxOs involved, the operations that take place both during the game and in the setup phase, and the necessary validators and minting policies.
+
+There will be a single script UTxO for the `Pot`, several `PelletState` UTxOs and a `ShipState` UTxO for every user. The `Pot` UTxO locks the ada amount paid by each user when creating a ship, and it's position on the board is always assumed to be (0,0). Both `PelletState` and `ShipState` UTxOs have their positions specified in the datum. In order to identify valid game UTxOs, the admin will deposit a special token (the "admin token") in the `PelletState` and `Pot` UTxOs when creating them. This token is also used for parameterizing the pot and fuel validators, so we could have different "versions" of the game, each one with a different admin token.
+
+Each ship will be identified by a `ShipToken`, with a fixed policy id but a token name of their own. This is the token that is minted by the _Ship minting policy_, described in the validators section.
+
+
+## UTxOs specification
+
+### ShipState UTxO:
+
+>#### Address
+>* Parameterized on admin token, `Pot` validator address and `PelletState` validator address.
+>
+>#### Datum
+>* pos_x: **Int**
+>* pos_y: **Int**
+>* fuel: **Int**
+>* pilot_token: **(PolicyId, AssetName)**
+>* ship_token_policy: **PolicyId**
+>
+>#### Value
+>* minAda
+>* `ShipToken`
+
+### PelletState UTxO:
+
+>#### Address
+>* Parameterized on the admin token.
+>
+>#### Datum
+>* pos_x: **Int**
+>* pos_y: **Int**
+>* fuel: **Int**
+>* ship_token_policy: **PolicyId**
+>
+>#### Value
+>* minAda
+>* admin token
+
+### Pot UTxO:
+
+>#### Address
+>* Parameterized on the admin token.
+>
+>#### Datum
+>* ship_token_policy: **PolicyId**
+>
+>#### Value
+>* minAda
+>* reward amount.
+>* admin token
+>
+>Note: the reward amount is updated during the course of the game, whenever a new user joins or reaches the pot.
+
+
+## Transactions
+
+### Create Pot UTxO:
+This transaction creates the unique `Pot` UTxO locking min ada and an admin token. It stores in the datum the ship token policy id for being able to reference it in the validator.
+
+![createPot diagram](img/createPot.png)
+
+
+### Create a PelletState UTxO:
+Creates one `PelletState` UTxO locking min ada and an admin token, setting in the datum the `pos_x` and `pos_y` coordinates where the pellet will be located on the grid and the `fuel` value equal to some initial value.
+
+![createPellet diagram](img/createPellet.png)
+
+
+### Create a ShipState UTxO:
+Creates a `ShipState` UTxO locking min ada and a ship token (minted in this tx), specifying in the datum the initial `pos_x` and `pos_y` coordinates of the ship, and setting `fuel` to an initial amount. Also adds to the `Pot` UTxO value the inscription fee paid by the user.
+
+![createShip diagram](img/createShip.png)
+
+
+### Move a Ship:
+Updates the `pos_x`, `pos_y` and `fuel` datum fields of the `ShipState` UTxO by adding the `delta_x` and `delta_y` values specified in the redeemer, and subtracting the fuel amount needed for the displacement.
+
+![moveShip diagram](img/moveShip.png)
+
+
+### Gather Fuel:
+Updates the `fuel` datum field of both the `ShipState` and `PelletState` UTxOs, adding the `amount` (specified in the redeemer) from the first and subtracting it from the latter.
+
+![gatherFuel diagram](img/gatherFuel.png)
+
+
+### Collect Rewards:
+Subtracts from the `Pot` UTxO 50% of the ada value, and pays that amount to the owner of the ship that reached the pot, together with the min ada locked in the `ShipState` UTxO. The ship token is burnt.
+
+![collect diagram](img/collect.png)
+
+
+### Quit Game:
+Pays the min ada locked in the `ShipState` UTxO back to the ship owner and burns the ship token.
+
+![quit diagram](img/quit.png)
+
+
+## Validators & Minting Policies
+
+### Pot validator:
+* Params: admin token.
+
+#### *AddNewPlayer Redeemer*
+* `Pot` output value equals input value plus the inscription fee.
+* adminToken is in the input.
+* datum doesn't change.
+
+#### *Collect Redeemer (includes address of the player that reached the pot)*
+* ship token is present in some input.
+* `Pot` output value has at most 50% adas less than input value.
+
+### PelletState validator:
+* Params: admin token.
+
+#### *Gather Redeemer (includes gathering amount)*
+* ship token is present in some input.
+* the amount specified is not greater than the fuel available in the pellet.
+* the amount specified is subtracted from the output `PelletState` fuel datum field, and the other fields remain unchanged.
+
+### ShipState validator:
+* Params: admin token, `Pot` validator address and `PelletState` validator address.
+
+#### *MoveShip Redeemer (includes delta_x and delta_y displacements)*
+* ship token is present.
+* there is a single `ShipState` input.
+* there is a single `ShipState` output.
+* the `PilotToken` is present in an input.
+* the `ShipState` input has enough fuel to move the desired delta.
+* the `ShipState` output value doesn't change.
+* the pilot_token datum field is not changed.
+* the x and y output datum values are updated as the previous ones (input values) plus the corresponding deltas.
+* the output fuel datum field equals the input fuel minus the fuel required for the displacement.
+* the distance advanced doesn't exceed the `MAX_SHIP_MOVEMENT_PER_TX`.
+
+#### *Gather Redeemer (includes gathering amount)*
+* there is a single `ShipState` input.
+* there is a single `ShipState` output.
+* there is a `PelletState` input with the same x and y datum coordinates as the `ShipState` UTxO.
+* the amount specified plus the fuel before charging does not exceed the ship's fuel capacity.
+* the amount specified is added to the output `ShipState` fuel datum field, and the other fields remain unchanged.
+* the `ShipState` output value is the same as the input.
+
+#### *Collect Redeemer*
+* there is a single `ShipState` input.
+* pilot token is present.
+* `ShipState` position is (0,0).
+* `Pot` UTxO is input.
+* ship token is burnt.
+
+#### *Quit Redeemer*
+* there is a single `ShipState` input.
+* the `PilotToken` is present in an input.
+* no `ShipState` output.
+
+### Ship minting policy:
+* Params: `ShipState` validator address.
+
+#### MINT:
+* a single token is minted.
+* there is a single `ShipState` output.
+* the `ShipState` output datum has x and y coordinates such that distance from (0,0) is above the minimum distance.
+* the `ShipState` output datum has the `ship_token_policy` set as the policy id of the minted token.
+* the `ShipState` fuel datum field equals some initial value.
+* the minted token is paid to the `ShipState` validator address.
+
+#### BURN:
+* there is a `ShipState` input.
+* the `ShipState` input is at coordinates (0,0).
+* only one token is burnt.
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