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

namespace StellaOps.ElkSharp;

internal static partial class ElkEdgeRouterIterative
{
    private static bool ShouldPreferFastTerminalOnlyHardRuleClosure(RoutingRetryState retryState)
    {
        return retryState.RemainingShortHighways == 0
            && retryState.RepeatCollectorCorridorViolations == 0
            && retryState.RepeatCollectorNodeClearanceViolations == 0
            && retryState.TargetApproachBacktrackingViolations == 0
            && retryState.ExcessiveDetourViolations == 0
            && retryState.BoundarySlotViolations == 0
            && retryState.BelowGraphViolations == 0
            && retryState.UnderNodeViolations == 0
            && retryState.LongDiagonalViolations == 0
            && retryState.SharedLaneViolations <= 2
            && (retryState.TargetApproachJoinViolations > 0
                || retryState.EntryAngleViolations > 0
                || retryState.GatewaySourceExitViolations > 0
                || retryState.SharedLaneViolations > 0);
    }

    private static ElkRoutedEdge[] BuildFastTerminalOnlyHardRuleCandidate(
        ElkRoutedEdge[] edges,
        ElkPositionedNode[] nodes,
        ElkLayoutDirection direction,
        double minLineClearance,
        IReadOnlyCollection<string> restrictedEdgeIds)
    {
        var candidate = edges;
        candidate = ChoosePreferredHardRuleLayout(
            candidate,
            ElkEdgePostProcessor.SeparateSharedLaneConflicts(
                candidate,
                nodes,
                minLineClearance,
                restrictedEdgeIds),
            nodes);
        candidate = ChoosePreferredHardRuleLayout(
            candidate,
            ElkEdgePostProcessor.SpreadSourceDepartureJoins(
                candidate,
                nodes,
                minLineClearance,
                restrictedEdgeIds),
            nodes);
        candidate = ChoosePreferredHardRuleLayout(
            candidate,
            ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(
                candidate,
                nodes,
                minLineClearance,
                restrictedEdgeIds),
            nodes);
        candidate = ChoosePreferredHardRuleLayout(
            candidate,
            ElkEdgePostProcessor.SpreadTargetApproachJoins(
                candidate,
                nodes,
                minLineClearance,
                restrictedEdgeIds,
                forceOutwardAxisSpacing: true),
            nodes);
        candidate = ChoosePreferredHardRuleLayout(
            candidate,
            ElkEdgePostProcessor.NormalizeBoundaryAngles(candidate, nodes),
            nodes);
        candidate = ChoosePreferredHardRuleLayout(
            candidate,
            ElkEdgePostProcessor.NormalizeSourceExitAngles(candidate, nodes),
            nodes);
        candidate = ChoosePreferredHardRuleLayout(
            candidate,
            ElkEdgePostProcessor.SeparateSharedLaneConflicts(
                candidate,
                nodes,
                minLineClearance,
                restrictedEdgeIds),
            nodes);
        return candidate;
    }

    private static bool ShouldPreferCompactFocusedTerminalClosure(
        RoutingRetryState retryState,
        int focusEdgeCount)
    {
        return focusEdgeCount <= 4
            && retryState.BoundarySlotViolations == 0
            && retryState.BelowGraphViolations == 0
            && retryState.UnderNodeViolations == 0
            && retryState.GatewaySourceExitViolations == 0
            && retryState.EntryAngleViolations == 0
            && retryState.TargetApproachBacktrackingViolations == 0
            && retryState.ExcessiveDetourViolations == 0
            && retryState.TargetApproachJoinViolations <= 1
            && retryState.SharedLaneViolations <= 1
            && (retryState.TargetApproachJoinViolations > 0
                || retryState.SharedLaneViolations > 0);
    }

    private static ElkRoutedEdge[] ApplyCompactFocusedTerminalClosure(
        ElkRoutedEdge[] edges,
        ElkPositionedNode[] nodes,
        ElkLayoutDirection direction,
        double minLineClearance,
        IReadOnlyCollection<string> focusedEdgeIds)
    {
        var candidate = edges;
        candidate = ApplyGuardedFocusedHardRulePass(
            candidate,
            nodes,
            current => ElkEdgePostProcessor.SeparateSharedLaneConflicts(current, nodes, minLineClearance, focusedEdgeIds));
        candidate = ApplyGuardedFocusedHardRulePass(
            candidate,
            nodes,
            current => ElkEdgePostProcessor.SpreadSourceDepartureJoins(current, nodes, minLineClearance, focusedEdgeIds));
        candidate = ApplyGuardedFocusedHardRulePass(
            candidate,
            nodes,
            current => ElkEdgePostProcessor.RepairBoundaryAnglesAndTargetApproaches(current, nodes, minLineClearance, focusedEdgeIds));
        candidate = ApplyGuardedFocusedHardRulePass(
            candidate,
            nodes,
            current => ElkEdgePostProcessor.SpreadTargetApproachJoins(
                current,
                nodes,
                minLineClearance,
                focusedEdgeIds,
                forceOutwardAxisSpacing: true));
        candidate = ApplyGuardedFocusedHardRulePass(
            candidate,
            nodes,
            current => ElkEdgePostProcessor.SeparateSharedLaneConflicts(current, nodes, minLineClearance, focusedEdgeIds));
        candidate = ApplyGuardedFocusedHardRulePass(
            candidate,
            nodes,
            current => ElkEdgePostProcessor.NormalizeBoundaryAngles(current, nodes));
        candidate = ApplyGuardedFocusedHardRulePass(
            candidate,
            nodes,
            current => ElkEdgePostProcessor.NormalizeSourceExitAngles(current, nodes));
        return candidate;
    }

}