using System.Collections.Concurrent;
using System.Diagnostics;
using System.Globalization;

namespace StellaOps.ElkSharp;

internal static partial class ElkEdgeRouterIterative
{
    private static ElkRoutedEdge[] ApplyPostProcessing(
        ElkRoutedEdge[] edges,
        ElkPositionedNode[] nodes,
        ElkLayoutOptions layoutOptions,
        bool preferHybridTerminalCleanup = false)
    {
        if (preferHybridTerminalCleanup)
        {
            return ApplyLeanHybridBaselinePostProcessing(edges, nodes, layoutOptions);
        }

        var result = ElkEdgePostProcessor.AvoidNodeCrossings(edges, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.EliminateDiagonalSegments(result, nodes);
        result = ElkEdgePostProcessorSimplify.SimplifyEdgePaths(result, nodes);
        result = ElkEdgePostProcessorSimplify.TightenOuterCorridors(result, nodes);
        if (HighwayProcessingEnabled)
        {
            result = ElkEdgeRouterHighway.BreakShortHighways(result, nodes);
        }

        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessorSimplify.SimplifyEdgePaths(result, nodes);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        var serviceNodes = nodes.Where(n => n.Kind is not "Start" and not "End").ToArray();
        var minLineClearance = serviceNodes.Length > 0
            ? Math.Min(serviceNodes.Average(n => n.Width), serviceNodes.Average(n => n.Height)) / 2d
            : 50d;
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadSourceDepartureJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.ElevateUnderNodeViolations(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadSourceDepartureJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = RestoreProtectedRepeatCollectorCorridors(result, edges, nodes);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadSourceDepartureJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadSourceDepartureJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadSourceDepartureJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadSourceDepartureJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ClampBelowGraphEdges(result, nodes);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.FinalizeDecisionTargetEntries(result, nodes);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.FinalizeGatewayBoundaryGeometry(result, nodes);
        result = ElkEdgePostProcessor.FinalizeDecisionTargetEntries(result, nodes);
        result = ElkEdgePostProcessor.SpreadRectTargetApproachFeederBands(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SeparateRepeatCollectorLocalLaneConflicts(result, nodes, minLineClearance);
        result = ClampBelowGraphEdges(result, nodes);
        result = ElkEdgePostProcessor.AvoidNodeCrossings(result, nodes, layoutOptions.Direction);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadSourceDepartureJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SpreadRectTargetApproachFeederBands(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.ElevateRepeatCollectorNodeClearanceViolations(result, nodes, minLineClearance);
        result = ElkRepeatCollectorCorridors.SeparateSharedLanes(result, nodes);
        result = ElkEdgePostProcessor.SeparateRepeatCollectorLocalLaneConflicts(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SeparateSharedLaneConflicts(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SeparateSharedLaneConflicts(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.PreferShortestBoundaryShortcuts(result, nodes);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        result = ElkEdgePostProcessor.SpreadSourceDepartureJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SeparateMixedNodeFaceLaneConflicts(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SpreadTargetApproachJoins(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.NormalizeBoundaryAngles(result, nodes);
        result = ElkEdgePostProcessor.NormalizeSourceExitAngles(result, nodes);
        // The final hard-rule closure must end on lane separation so later
        // boundary slot normalizers cannot collapse a repaired handoff strip
        // back onto the same effective rail.
        result = ElkEdgePostProcessor.SeparateMixedNodeFaceLaneConflicts(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SeparateSharedLaneConflicts(result, nodes, minLineClearance);
        result = ClampBelowGraphEdges(result, nodes);
        result = ElkEdgePostProcessor.SnapBoundarySlotAssignments(
            result,
            nodes,
            minLineClearance,
            enforceAllNodeEndpoints: true);
        result = ApplyPostSlotDetourClosure(result, nodes, minLineClearance);
        result = ElkEdgePostProcessor.SnapBoundarySlotAssignments(
            result,
            nodes,
            minLineClearance,
            enforceAllNodeEndpoints: true);

        var score = ElkEdgeRoutingScoring.ComputeScore(result, nodes);
        var remainingBrokenHighways = HighwayProcessingEnabled
            ? ElkEdgeRouterHighway.DetectRemainingBrokenHighways(result, nodes).Count
            : 0;
        var retryState = BuildRetryState(score, remainingBrokenHighways);
        if (retryState.RequiresBlockingRetry || retryState.RequiresLengthRetry)
        {
            var stabilized = preferHybridTerminalCleanup
                ? ApplyHybridTerminalRuleCleanupRound(
                    result,
                    nodes,
                    layoutOptions.Direction,
                    minLineClearance)
                : ApplyTerminalRuleCleanupRound(
                    result,
                    nodes,
                    layoutOptions.Direction,
                    minLineClearance);
            var stabilizedScore = ElkEdgeRoutingScoring.ComputeScore(stabilized, nodes);
            var stabilizedBrokenHighways = HighwayProcessingEnabled
                ? ElkEdgeRouterHighway.DetectRemainingBrokenHighways(stabilized, nodes).Count
                : 0;
            var stabilizedRetryState = BuildRetryState(stabilizedScore, stabilizedBrokenHighways);
            if (IsBetterBoundarySlotRepairCandidate(
                stabilizedScore,
                stabilizedRetryState,
                score,
                retryState))
            {
                result = stabilized;
            }
        }

        return result;
    }
}