using OpenDBDiff.Abstractions.Schema;
using OpenDBDiff.Abstractions.Schema.Model;
using System;

namespace OpenDBDiff.SqlServer.Schema.Model
{
    /// <summary>
    /// Clase de constraints de Columnas (Default Constraint y Check Constraint)
    /// </summary>
    public class ColumnConstraint : SQLServerSchemaBase
    {
        public ColumnConstraint(Column parent)
            : base(parent, ObjectType.Constraint)
        {
        }

        /// <summary>
        /// Clona el objeto ColumnConstraint en una nueva instancia.
        /// </summary>
        public ColumnConstraint Clone(Column parent)
        {
            ColumnConstraint ccons = new ColumnConstraint(parent);
            ccons.Name = this.Name;
            ccons.Type = this.Type;
            ccons.Definition = this.Definition;
            ccons.Status = this.Status;
            ccons.Disabled = this.Disabled;
            ccons.Owner = this.Owner;
            return ccons;
        }

        /// <summary>
        /// Indica si la constraint esta deshabilitada.
        /// </summary>
        public Boolean Disabled { get; set; }

        /// <summary>
        /// Indica si la constraint va a ser usada en replicacion.
        /// </summary>
        public Boolean NotForReplication { get; set; }


        /// <summary>
        /// Gets or sets a value indicating whether [with no check].
        /// </summary>
        /// <value><c>true</c> if [with no check]; otherwise, <c>false</c>.</value>
        public Boolean WithNoCheck { get; set; }

        /// <summary>
        /// Valor de la constraint.
        /// </summary>
        public string Definition { get; set; }

        /// <summary>
        /// Indica el tipo de constraint (Default o Check constraint).
        /// </summary>
        public Constraint.ConstraintType Type { get; set; }

        /// <summary>
        /// Convierte el schema de la constraint en XML.
        /// </summary>
        public string ToXML()
        {
            string xml = "";
            if (this.Type == Constraint.ConstraintType.Default)
            {
                xml += "<COLUMNCONSTRAINT name=\"" + Name + "\" type=\"DF\" value=\"" + Definition + "\"/>\n";
            }
            if (this.Type == Constraint.ConstraintType.Check)
            {
                xml += "<COLUMNCONSTRAINT name=\"" + Name + "\" type=\"C\" value=\"" + Definition + "\" notForReplication=\"" + (NotForReplication ? "1" : "0") + "\"/>\n";
            }
            return xml;
        }

        /// <summary>
        /// Compara dos campos y devuelve true si son iguales, caso contrario, devuelve false.
        /// </summary>
        public static Boolean Compare(ColumnConstraint origin, ColumnConstraint destination)
        {
            if (destination == null) throw new ArgumentNullException("destination");
            if (origin == null) throw new ArgumentNullException("origin");
            if (origin.NotForReplication != destination.NotForReplication) return false;
            if (origin.Disabled != destination.Disabled) return false;
            if ((!origin.Definition.Equals(destination.Definition)) && (!origin.Definition.Equals("(" + destination.Definition + ")"))) return false;
            return true;
        }

        public override SQLScript Create()
        {
            ScriptAction action = ScriptAction.AddConstraint;
            if (!GetWasInsertInDiffList(action))
            {
                SetWasInsertInDiffList(action);
                return new SQLScript(this.ToSqlAdd(), 0, action);
            }
            else
                return null;

        }

        public override SQLScript Drop()
        {
            ScriptAction action = ScriptAction.DropConstraint;
            if (!GetWasInsertInDiffList(action))
            {
                SetWasInsertInDiffList(action);
                return new SQLScript(this.ToSqlDrop(), 0, action);
            }
            else
                return null;
        }

        public Boolean CanCreate
        {
            get
            {
                ObjectStatus tableStatus = this.Parent.Parent.Status;
                ObjectStatus columnStatus = this.Parent.Status;
                return ((columnStatus != ObjectStatus.Drop) && (((tableStatus == ObjectStatus.Alter) || (tableStatus == ObjectStatus.Original) || (tableStatus == ObjectStatus.RebuildDependencies)) && (this.Status == ObjectStatus.Original)));
            }
        }

        /// <summary>
        /// Devuelve el schema de la constraint en formato SQL.
        /// </summary>
        public override string ToSql()
        {
            string sql = "";
            if (this.Type == Constraint.ConstraintType.Default)
                sql = " CONSTRAINT [" + Name + "] DEFAULT " + Definition;
            return sql;
        }

        /// <summary>
        /// Toes the SQL add.
        /// </summary>
        /// <returns></returns>
        public override string ToSqlAdd()
        {
            if (this.Type == Constraint.ConstraintType.Default)
                return "ALTER TABLE " + ((Table)Parent.Parent).FullName + " ADD" + ToSql() + " FOR [" + Parent.Name + "]\r\nGO\r\n";
            if (this.Type == Constraint.ConstraintType.Check)
                return "ALTER TABLE " + ((Table)Parent.Parent).FullName + " ADD" + ToSql() + "\r\nGO\r\n";
            return "";
        }

        /// <summary>
        /// Toes the SQL drop.
        /// </summary>
        /// <returns></returns>
        public override string ToSqlDrop()
        {
            return "ALTER TABLE " + ((Table)Parent.Parent).FullName + " DROP CONSTRAINT [" + Name + "]\r\nGO\r\n";
        }

        public override SQLScriptList ToSqlDiff(System.Collections.Generic.ICollection<ISchemaBase> schemas)
        {
            SQLScriptList list = new SQLScriptList();
            if (this.HasState(ObjectStatus.Drop))
                list.Add(Drop());
            if (this.HasState(ObjectStatus.Create))
                list.Add(Create());

            if (this.Status == ObjectStatus.Alter)
            {
                list.Add(Drop());
                list.Add(Create());
            }
            return list;
        }
    }
}