// p4rse, Copyright 2026, Will Hawkins
//
// This file is part of p4rse.
//
// This file is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

open class ProgramExecution: CustomStringConvertible {
  public var scopes: ValueScopes = ValueScopes()
  var error: Error?
  var debug: DebugLevel = DebugLevel.Error

  public init() {}

  open var description: String {
    return "Runtime:\nScopes: \(scopes)"
  }

  public func hasError() -> Bool {
    return self.error != nil
  }

  public func getError() -> Error? {
    return self.error
  }

  public func setError(error: Error) -> ProgramExecution {
    let npe = self
    npe.error = error
    return npe
  }

  public func getDebugLevel() -> DebugLevel {
    return self.debug
  }

  public func setDebugLevel(_ dl: DebugLevel) -> ProgramExecution {
    let pe = self
    pe.debug = dl
    return pe
  }

  open func isDone() -> Bool {
    return false
  }

  open func setDone() -> ProgramExecution {
    // For a bare ProgramExecution, setDone is a noop.
    return self
  }

  public func enter_scope() -> ProgramExecution {
    let new_pe = self
    new_pe.scopes = self.scopes.enter()

    return new_pe
  }

  public func exit_scope() -> ProgramExecution {
    let new_pe = self
    new_pe.scopes = self.scopes.exit()

    return new_pe
  }

  public func declare(identifier: Identifier, withValue value: P4Value) -> ProgramExecution {
    let new_pe = self
    let new_scopes = self.scopes.declare(identifier: identifier, withValue: value)

    new_pe.scopes = new_scopes
    return new_pe
  }
}

public typealias ValueScope = Scope<P4Value>
public typealias ValueScopes = Scopes<P4Value>