using SharepointToolbox.Web.Core.Models;

namespace SharepointToolbox.Web.Core.Helpers;

public static class PermissionLevelMapping
{
    public record MappingResult(string Label, RiskLevel RiskLevel);

    private static readonly Dictionary<string, MappingResult> Mappings = new(StringComparer.OrdinalIgnoreCase)
    {
        ["Full Control"]                  = new("Full control (can manage everything)", RiskLevel.High),
        ["Site Collection Administrator"] = new("Site collection admin (full control)", RiskLevel.High),
        ["Contribute"]                    = new("Can edit files and list items", RiskLevel.Medium),
        ["Edit"]                          = new("Can edit files, lists, and pages", RiskLevel.Medium),
        ["Design"]                        = new("Can edit pages and use design tools", RiskLevel.Medium),
        ["Approve"]                       = new("Can approve content and list items", RiskLevel.Medium),
        ["Manage Hierarchy"]              = new("Can create sites and manage pages", RiskLevel.Medium),
        ["Read"]                          = new("Can view files and pages", RiskLevel.Low),
        ["Restricted Read"]               = new("Can view pages only (no download)", RiskLevel.Low),
        ["View Only"]                     = new("Can view files in browser only", RiskLevel.ReadOnly),
        ["Restricted View"]               = new("Restricted view access", RiskLevel.ReadOnly),
    };

    public static MappingResult GetMapping(string roleName)
    {
        if (string.IsNullOrWhiteSpace(roleName)) return new(roleName, RiskLevel.Low);
        return Mappings.TryGetValue(roleName.Trim(), out var result) ? result : new(roleName.Trim(), RiskLevel.Medium);
    }

    public static IReadOnlyList<MappingResult> GetMappings(string permissionLevels)
    {
        if (string.IsNullOrWhiteSpace(permissionLevels)) return Array.Empty<MappingResult>();
        return permissionLevels.Split(';', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
            .Select(GetMapping).ToList();
    }

    public static RiskLevel GetHighestRisk(string permissionLevels)
    {
        var mappings = GetMappings(permissionLevels);
        if (mappings.Count == 0) return RiskLevel.Low;
        return mappings.Min(m => m.RiskLevel);
    }

    public static string GetSimplifiedLabels(string permissionLevels)
        => string.Join("; ", GetMappings(permissionLevels).Select(m => m.Label));
}