const DefaultLimit = 50

type ChangeInfo = Stats

type CloseDoneInfo struct {
	Error error
}

type CloseStartInfo struct {
	// Context make available context in trace stack.Callerback function.
	// Pointer to context provide replacement of context in trace stack.Callerback function.
	// Warning: concurrent access to pointer on client side must be excluded.
	// Safe replacement of context are provided only inside stack.Callerback function
	Context *context.Context
	Call    stack.Caller
}

type GetDoneInfo struct {
	Error error
}

type GetStartInfo struct {
	// Context make available context in trace stack.Callerback function.
	// Pointer to context provide replacement of context in trace stack.Callerback function.
	// Warning: concurrent access to pointer on client side must be excluded.
	// Safe replacement of context are provided only inside stack.Callerback function
	Context *context.Context
	Call    stack.Caller
}

type Item[T any] interface {
	*T
	IsAlive() bool
	Close(ctx context.Context) error
}

type NewDoneInfo struct {
	Limit int
}

type NewStartInfo struct {
	// Context make available context in trace stack.Callerback function.
	// Pointer to context provide replacement of context in trace stack.Callerback function.
	// Warning: concurrent access to pointer on client side must be excluded.
	// Safe replacement of context are provided only inside stack.Callerback function
	Context *context.Context
	Call    stack.Caller
}

type Pool[PT Item[T], T any] struct {
	// contains filtered or unexported fields
}

type PutDoneInfo struct {
	Error error
}

type PutStartInfo struct {
	// Context make available context in trace stack.Callerback function.
	// Pointer to context provide replacement of context in trace stack.Callerback function.
	// Warning: concurrent access to pointer on client side must be excluded.
	// Safe replacement of context are provided only inside stack.Callerback function
	Context *context.Context
	Call    stack.Caller
}

type Stats struct {
	Limit int
	Index int
	Idle  int
	InUse int
}

type Trace struct {
	OnNew    func(*NewStartInfo) func(*NewDoneInfo)
	OnClose  func(*CloseStartInfo) func(*CloseDoneInfo)
	OnTry    func(*TryStartInfo) func(*TryDoneInfo)
	OnWith   func(*WithStartInfo) func(*WithDoneInfo)
	OnPut    func(*PutStartInfo) func(*PutDoneInfo)
	OnGet    func(*GetStartInfo) func(*GetDoneInfo)
	OnChange func(ChangeInfo)
}

type TryDoneInfo struct {
	Error error
}

type TryStartInfo struct {
	// Context make available context in trace stack.Callerback function.
	// Pointer to context provide replacement of context in trace stack.Callerback function.
	// Warning: concurrent access to pointer on client side must be excluded.
	// Safe replacement of context are provided only inside stack.Callerback function
	Context *context.Context
	Call    stack.Caller
}

type WithDoneInfo struct {
	Error error

	Attempts int
}

type WithStartInfo struct {
	// Context make available context in trace stack.Callerback function.
	// Pointer to context provide replacement of context in trace stack.Callerback function.
	// Warning: concurrent access to pointer on client side must be excluded.
	// Safe replacement of context are provided only inside stack.Callerback function
	Context *context.Context
	Call    stack.Caller
}