pub(all) enum ContactPattern {
  SingleStage
  Crosscurrent(Int)
  Countercurrent(Int)
} derive(Eq, ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct ScreeningWeights {
  extraction : Double
  handling : Double
  sustainability : Double
} derive(Eq, ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct SensitivityPoint {
  parameter : String
  base_value : Double
  lower_value : Double
  upper_value : Double
  base_recovery : Double
  lower_recovery : Double
  upper_recovery : Double
  normalized_sensitivity : Double
} derive(Eq, ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct SolventDesign {
  pattern : ContactPattern
  solvent_flow : Double
  solvent_to_feed_ratio : Double
  achieved_raffinate : Double
  achieved_recovery : Double
  iterations : Int
  target_raffinate : Double
  target_residual : Double
} derive(Eq, ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct SolventOption {
  name : String
  distribution_coefficient : Double
  selectivity : Double
  density_difference : Double
  viscosity : Double
  volatility : Double
  cost_index : Double
  safety_index : Double
} derive(Eq, ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct SolventScore {
  option : SolventOption
  extraction_score : Double
  handling_score : Double
  sustainability_score : Double
  total_score : Double
  rank : Int
  recommendation : String
} derive(Eq, ToJson, 
@moonbitlang/core/debug.Debug
Debug)

fn compare_contact_patterns(carrier_flow~ : Double, feed_concentration~ : Double, distribution~ : Double, target_raffinate~ : Double, maximum_stages? : Int) -> Array[SolventDesign] raise 
@zhaoyuanjuns/moonbit_extractor/domain.ExtractionError
ExtractionError

fn normalized_score(value : Double, reference : Double) -> Double

fn phase_split_gate(option : SolventOption, minimum_density_difference : Double) -> Bool

fn safety_gate(option : SolventOption, minimum_safety : Double) -> Bool

fn score_solvent(option : SolventOption, weights : ScreeningWeights) -> SolventScore raise 
@zhaoyuanjuns/moonbit_extractor/domain.ExtractionError
ExtractionError

fn score_solvents(options : ArrayView[SolventOption], weights : ScreeningWeights) -> Array[SolventScore] raise 
@zhaoyuanjuns/moonbit_extractor/domain.ExtractionError
ExtractionError

fn screening_weights_equal() -> ScreeningWeights

fn sensitivity_to_weight(options : ArrayView[SolventOption], extraction_weight : Double, handling_weight : Double, sustainability_weight : Double) -> Array[Double] raise 
@zhaoyuanjuns/moonbit_extractor/domain.ExtractionError
ExtractionError

fn single_stage_sensitivity(carrier_flow~ : Double, feed_concentration~ : Double, solvent_flow~ : Double, distribution~ : Double, relative_step? : Double) -> Array[SensitivityPoint] raise 
@zhaoyuanjuns/moonbit_extractor/domain.ExtractionError
ExtractionError

fn solvent_extraction_score(option : SolventOption) -> Double

fn solvent_for_countercurrent(carrier_flow~ : Double, feed_concentration~ : Double, distribution~ : Double, target_raffinate~ : Double, stage_count~ : Int, solvent_inlet_concentration? : Double, tolerance? : Double) -> SolventDesign raise 
@zhaoyuanjuns/moonbit_extractor/domain.ExtractionError
ExtractionError

fn solvent_for_crosscurrent(carrier_flow~ : Double, feed_concentration~ : Double, distribution~ : Double, target_raffinate~ : Double, stage_count~ : Int, tolerance? : Double) -> SolventDesign raise 
@zhaoyuanjuns/moonbit_extractor/domain.ExtractionError
ExtractionError

fn solvent_for_single_stage(carrier_flow~ : Double, feed_concentration~ : Double, distribution~ : Double, target_raffinate~ : Double) -> SolventDesign raise 
@zhaoyuanjuns/moonbit_extractor/domain.ExtractionError
ExtractionError

fn solvent_handling_score(option : SolventOption) -> Double

fn solvent_is_usable(option : SolventOption, minimum_safety : Double, minimum_density_difference : Double) -> Bool

fn solvent_score_gap(scores : ArrayView[SolventScore]) -> Double

fn solvent_screening_csv(scores : ArrayView[SolventScore]) -> String

fn solvent_screening_markdown(scores : ArrayView[SolventScore]) -> String

fn solvent_sustainability_score(option : SolventOption) -> Double

fn top_solvent(scores : ArrayView[SolventScore]) -> SolventScore?

fn usable_solvents(options : ArrayView[SolventOption], minimum_safety : Double, minimum_density_difference : Double) -> Array[SolventOption]