Add fish selling, buyer profiles, and player wallet

economy/buyers/main_fishing_shop.tres

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+[gd_resource type="Resource" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://economy/fish_buyer_profile.gd" id="1_profile"]
+
+[resource]
+script = ExtResource("1_profile")
+id = &"main_fishing_shop"
+display_name = "Main Fishing Shop"
+animal_name_singular = "shopkeeper"
+animal_name_plural = "shopkeepers"
+payout_multiplier = 1.0

economy/buyers/pelicans.tres

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+[gd_resource type="Resource" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://economy/fish_buyer_profile.gd" id="1_profile"]
+
+[resource]
+script = ExtResource("1_profile")
+id = &"pelicans"
+display_name = "Pelicans"
+animal_name_singular = "pelican"
+animal_name_plural = "pelicans"
+payout_multiplier = 0.7
+sale_message_template = "You sold your {fish} to the pelicans for ${payout}."

economy/buyers/trading_post.tres

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+[gd_resource type="Resource" load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://economy/fish_buyer_profile.gd" id="1_profile"]
+
+[resource]
+script = ExtResource("1_profile")
+id = &"trading_post"
+display_name = "Trading Post"
+animal_name_singular = "otter"
+animal_name_plural = "otters"
+payout_multiplier = 0.85

economy/fish_buyer_profile.gd

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+class_name FishBuyerProfile
+extends Resource
+
+@export var id: StringName
+@export var display_name: String
+@export var animal_name_singular: String
+@export var animal_name_plural: String
+@export_range(0.0, 10.0, 0.01) var payout_multiplier: float = 1.0
+@export_multiline var sale_message_template: String
+
+
+func is_valid() -> bool:
+	return (
+		not id.is_empty()
+		and not display_name.is_empty()
+		and payout_multiplier >= 0.0
+		and is_finite(payout_multiplier)
+	)
+
+
+func get_offer(base_value: int) -> int:
+	if not is_valid() or base_value < 0:
+		return -1
+	var offer: int = roundi(float(base_value) * payout_multiplier)
+	return maxi(offer, 0)
+
+
+func get_sale_message(
+	fish_name: String,
+	payout: int,
+) -> String:
+	if not sale_message_template.is_empty():
+		return sale_message_template.format(
+			{
+				"fish": fish_name,
+				"payout": payout,
+			}
+		)
+	var buyer_name: String = animal_name_plural
+	if buyer_name.is_empty():
+		buyer_name = display_name
+	return "You sold your %s to the %s for $%d." % [
+		fish_name,
+		buyer_name,
+		payout,
+	]

economy/fish_buyer_profile.gd.uid

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+uid://cq1b2avld4qay

economy/fish_sale_result.gd

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+class_name FishSaleResult
+extends RefCounted
+
+enum Status {
+	SUCCESS,
+	NOT_FOUND,
+	FAVORITED,
+	INVALID_VALUE,
+	INVALID_BUYER,
+	INVALID_OFFER,
+	TRANSACTION_FAILED,
+}
+
+var success: bool = false
+var status: Status = Status.TRANSACTION_FAILED
+var catch_id: StringName
+var fish_name: String = ""
+var buyer_id: StringName
+var buyer_display_name: String = ""
+var buyer_animal_name: String = ""
+var base_value: int = 0
+var payout: int = 0
+var sale_message: String = ""
+
+
+func is_success() -> bool:
+	return success and status == Status.SUCCESS
+
+
+func get_message() -> String:
+	match status:
+		Status.SUCCESS:
+			return sale_message
+		Status.NOT_FOUND:
+			return "Fish no longer exists."
+		Status.FAVORITED:
+			return "Favorited fish cannot be sold."
+		Status.INVALID_VALUE:
+			return "Invalid sale value."
+		Status.INVALID_BUYER:
+			return "Buyer is unavailable."
+		Status.INVALID_OFFER:
+			return "Invalid buyer offer."
+		_:
+			return "Transaction failed."

economy/fish_sale_result.gd.uid

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+uid://c02hcw8fkn5i8

economy/fish_sale_service.gd

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+class_name FishSaleService
+extends Node
+
+const FishCatchType = preload("res://fish/fish_catch.gd")
+const FishBuyerProfileType = preload("res://economy/fish_buyer_profile.gd")
+const FishInventoryType = preload("res://inventory/fish_inventory.gd")
+const FishSaleResultType = preload("res://economy/fish_sale_result.gd")
+const PlayerWalletType = preload("res://economy/player_wallet.gd")
+
+signal sale_completed(result: FishSaleResultType)
+
+var _inventory: FishInventoryType
+var _wallet: PlayerWalletType
+
+
+func setup(
+	inventory: FishInventoryType,
+	wallet: PlayerWalletType,
+) -> void:
+	_inventory = inventory
+	_wallet = wallet
+
+
+func can_sell(
+	catch_id: StringName,
+	buyer: FishBuyerProfileType,
+) -> bool:
+	return _validate_sale(catch_id, buyer).is_success()
+
+
+func sell(
+	catch_id: StringName,
+	buyer: FishBuyerProfileType,
+) -> FishSaleResultType:
+	var result: FishSaleResultType = _validate_sale(catch_id, buyer)
+	if not result.is_success():
+		return result
+
+	var removed_catch: FishCatchType = _inventory.remove_catch_by_id(catch_id)
+	if removed_catch == null:
+		result.success = false
+		result.status = FishSaleResultType.Status.NOT_FOUND
+		return result
+	if not _wallet.credit(result.payout):
+		_inventory.add_catch(removed_catch)
+		result.success = false
+		result.status = FishSaleResultType.Status.TRANSACTION_FAILED
+		return result
+	sale_completed.emit(result)
+	return result
+
+
+func _validate_sale(
+	catch_id: StringName,
+	buyer: FishBuyerProfileType,
+) -> FishSaleResultType:
+	var result := FishSaleResultType.new()
+	result.catch_id = catch_id
+	if (
+		catch_id.is_empty()
+		or _inventory == null
+		or _wallet == null
+	):
+		result.status = FishSaleResultType.Status.NOT_FOUND
+		return result
+	if buyer == null or not buyer.is_valid():
+		result.status = FishSaleResultType.Status.INVALID_BUYER
+		return result
+	var fish_catch: FishCatchType = _inventory.get_catch_by_id(catch_id)
+	if fish_catch == null:
+		result.status = FishSaleResultType.Status.NOT_FOUND
+		return result
+	result.fish_name = fish_catch.fish.display_name
+	result.buyer_id = buyer.id
+	result.buyer_display_name = buyer.display_name
+	result.buyer_animal_name = (
+		buyer.animal_name_plural
+		if not buyer.animal_name_plural.is_empty()
+		else buyer.display_name
+	)
+	result.base_value = fish_catch.sale_value
+	result.payout = buyer.get_offer(result.base_value)
+	if fish_catch.is_favorited:
+		result.status = FishSaleResultType.Status.FAVORITED
+	elif fish_catch.sale_value < 0:
+		result.status = FishSaleResultType.Status.INVALID_VALUE
+	elif result.payout < 0:
+		result.status = FishSaleResultType.Status.INVALID_OFFER
+	elif not _wallet.can_credit(result.payout):
+		result.status = FishSaleResultType.Status.TRANSACTION_FAILED
+	else:
+		result.status = FishSaleResultType.Status.SUCCESS
+		result.success = true
+		result.sale_message = buyer.get_sale_message(
+			result.fish_name,
+			result.payout
+		)
+	return result

economy/fish_sale_service.gd.uid

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+uid://cg3ec2ypo26xh

economy/player_wallet.gd

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+class_name PlayerWallet
+extends Node
+
+signal balance_changed(new_balance: int, delta: int)
+
+@export var current_balance: int = 0
+
+
+func _ready() -> void:
+	current_balance = maxi(current_balance, 0)
+
+
+func get_balance() -> int:
+	return current_balance
+
+
+func can_afford(amount: int) -> bool:
+	return amount >= 0 and current_balance >= amount
+
+
+func can_credit(amount: int) -> bool:
+	return (
+		amount >= 0
+		and current_balance <= 9223372036854775807 - amount
+	)
+
+
+func credit(amount: int) -> bool:
+	if not can_credit(amount):
+		return false
+	if amount == 0:
+		return true
+	current_balance += amount
+	balance_changed.emit(current_balance, amount)
+	return true
+
+
+func debit(amount: int) -> bool:
+	if not can_afford(amount):
+		return false
+	if amount == 0:
+		return true
+	current_balance -= amount
+	balance_changed.emit(current_balance, -amount)
+	return true

economy/player_wallet.gd.uid

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+uid://dp1uf8h8eevs