const (
	DefaultMaxSize        = 50
	DefaultMinSize        = 0
	DefaultProducersCount = 1
)

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 {
	Error error

	// actual settings
	MinSize        int
	MaxSize        int
	ProducersCount 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

	// input settings
	MinSize        int
	MaxSize        int
	ProducersCount int
}

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

type ProduceDoneInfo struct{}

type ProduceStartInfo 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

	Concurrency int
}

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 SpawnDoneInfo struct {
	Error error
}

type SpawnStartInfo 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 Trace struct {
	OnNew     func(*NewStartInfo) func(*NewDoneInfo)
	OnClose   func(*CloseStartInfo) func(*CloseDoneInfo)
	OnProduce func(*ProduceStartInfo) func(*ProduceDoneInfo)
	OnTry     func(*TryStartInfo) func(*TryDoneInfo)
	OnWith    func(*WithStartInfo) func(*WithDoneInfo)
	OnPut     func(*PutStartInfo) func(*PutDoneInfo)
	OnGet     func(*GetStartInfo) func(*GetDoneInfo)
	OnSpawn   func(*SpawnStartInfo) func(*SpawnDoneInfo)
	OnWant    func(*WantStartInfo) func(*WantDoneInfo)
}

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 WantDoneInfo struct {
	Error error
}

type WantStartInfo 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
}