using System;
using System.Collections.Generic;
using System.Xml.Serialization;

namespace XSDVisualiser.Models
{
    /// <summary>
    /// Root of the parsed XSD representation.
    /// </summary>
    [XmlRoot("SchemaModel")]
    public class SchemaModel
    {
        [XmlAttribute]
        public string? TargetNamespace { get; set; }

        [XmlArray("RootElements")]
        [XmlArrayItem("Element")]
        public List<SchemaNode> RootElements { get; set; } = new();
    }

    /// <summary>
    /// Represents an element or complex content node in the schema.
    /// </summary>
    public class SchemaNode
    {
        [XmlAttribute]
        public string? Name { get; set; }

        [XmlAttribute]
        public string? Namespace { get; set; }

        [XmlAttribute]
        public string? TypeName { get; set; }

        [XmlAttribute]
        public string? BuiltInType { get; set; }

        [XmlAttribute]
        public bool IsNillable { get; set; }

        [XmlElement]
        public Occurs Cardinality { get; set; } = new();

        [XmlElement]
        public ConstraintSet? Constraints { get; set; }

        [XmlArray("Attributes")]
        [XmlArrayItem("Attribute")]
        public List<AttributeInfo> Attributes { get; set; } = new();

        [XmlArray("Children")]
        [XmlArrayItem("Element")]
        public List<SchemaNode> Children { get; set; } = new();

        [XmlAttribute]
        public string? ContentModel { get; set; } // sequence | choice | all | simple
    }

    /// <summary>
    /// Min/Max occurrences.
    /// </summary>
    public class Occurs
    {
        [XmlAttribute]
        public decimal Min { get; set; } = 1;

        /// <summary>
        /// If MaxIsUnbounded is true, Max is ignored.
        /// </summary>
        [XmlAttribute]
        public decimal Max { get; set; } = 1;

        [XmlAttribute]
        public bool MaxIsUnbounded { get; set; }
    }

    /// <summary>
    /// Attribute definition extracted from XSD.
    /// </summary>
    public class AttributeInfo
    {
        [XmlAttribute]
        public string? Name { get; set; }

        [XmlAttribute]
        public string? Namespace { get; set; }

        [XmlAttribute]
        public string? Use { get; set; } // optional | required | prohibited

        [XmlAttribute]
        public string? TypeName { get; set; }

        [XmlAttribute]
        public string? BuiltInType { get; set; }

        [XmlElement]
        public ConstraintSet? Constraints { get; set; }
    }

    /// <summary>
    /// SimpleType constraints (facets).
    /// </summary>
    public class ConstraintSet
    {
        [XmlAttribute]
        public string? BaseTypeName { get; set; }

        [XmlArray("Enumerations")]
        [XmlArrayItem("Value")]
        public List<string> Enumerations { get; set; } = new();

        [XmlArray("Patterns")]
        [XmlArrayItem("Regex")]
        public List<string> Patterns { get; set; } = new();

        [XmlElement]
        public NumericBounds? Numeric { get; set; }

        [XmlElement]
        public LengthBounds? Length { get; set; }
    }

    public class NumericBounds
    {
        [XmlAttribute]
        public string? MinInclusive { get; set; }
        [XmlAttribute]
        public string? MaxInclusive { get; set; }
        [XmlAttribute]
        public string? MinExclusive { get; set; }
        [XmlAttribute]
        public string? MaxExclusive { get; set; }
    }

    public class LengthBounds
    {
        [XmlAttribute]
        public int Length { get; set; }
        [XmlIgnore]
        public bool LengthSpecified { get; set; }

        [XmlAttribute]
        public int MinLength { get; set; }
        [XmlIgnore]
        public bool MinLengthSpecified { get; set; }

        [XmlAttribute]
        public int MaxLength { get; set; }
        [XmlIgnore]
        public bool MaxLengthSpecified { get; set; }
    }
}