using FastReport.Utils;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Windows.Forms;

namespace FastReport
{
    /// <summary>
    /// Class that implements some object's properties such as location, size and visibility.
    /// </summary>
    public abstract partial class ComponentBase : Base
    {
        #region Fields

        private AnchorStyles anchor;
        private DockStyle dock;
        private int groupIndex;
        private float height;
        private float left;
        private string tag;
        private float top;
        private bool visible;
        private string visibleExpression;
        private bool printable;
        private string printableExpression;
        private float width;

        #endregion Fields

        #region Properties

        /// <summary>
        /// Gets the absolute bottom coordinate of the object.
        /// </summary>
        [Browsable(false)]
        public float AbsBottom
        {
            get { return AbsTop + Height; }
        }

        /// <summary>
        /// Gets the absolute bounding rectangle of the object.
        /// </summary>
        [Browsable(false)]
        public RectangleF AbsBounds
        {
            get { return new RectangleF(AbsLeft, AbsTop, Width, Height); }
        }

        /// <summary>
        /// Gets the absolute left coordinate of the object.
        /// </summary>
        [Browsable(false)]
        public virtual float AbsLeft
        {
            get { return (Parent is ComponentBase) ? Left + (Parent as ComponentBase).AbsLeft : Left; }
        }

        /// <summary>
        /// Gets the absolute right coordinate of the object.
        /// </summary>
        [Browsable(false)]
        public float AbsRight
        {
            get { return AbsLeft + Width; }
        }

        /// <summary>
        /// Gets the absolute top coordinate of the object.
        /// </summary>
        [Browsable(false)]
        public virtual float AbsTop
        {
            get { return (Parent is ComponentBase) ? Top + (Parent as ComponentBase).AbsTop : Top; }
        }

        /// <summary>
        /// Gets or sets the edges of the container to which a control is bound and determines how a control
        /// is resized with its parent.
        /// </summary>
        /// <remarks>
        /// <para>Use the Anchor property to define how a control is automatically resized as its parent control
        /// is resized. Anchoring a control to its parent control ensures that the anchored edges remain in the
        /// same position relative to the edges of the parent control when the parent control is resized.</para>
        /// <para>You can anchor a control to one or more edges of its container. For example, if you have a band
        /// with a <b>TextObject</b> whose <b>Anchor</b> property value is set to <b>Top, Bottom</b>, the <b>TextObject</b> is stretched to
        /// maintain the anchored distance to the top and bottom edges of the band as the height of the band
        /// is increased.</para>
        /// </remarks>
        [DefaultValue(AnchorStyles.Left | AnchorStyles.Top)]
        [Category("Layout")]
        public virtual AnchorStyles Anchor
        {
            get { return anchor; }
            set { anchor = value; }
        }

        /// <summary>
        /// Gets the bottom coordinate of the object in relation to its container.
        /// </summary>
        /// <remarks>
        /// To change the bottom coordinate, change the <see cref="Top"/> and/or <see cref="Height"/> properties.
        /// </remarks>
        [Browsable(false)]
        public float Bottom
        {
            get { return Top + Height; }
        }

        /// <summary>
        /// Gets or sets the bounding rectangle of the object.
        /// </summary>
        /// <remarks>
        /// Assigning a value to this property is equal to assigning values to the <see cref="Left"/>,
        /// <see cref="Top"/>, <see cref="Width"/>, <see cref="Height"/> properties.
        /// </remarks>
        [Browsable(false)]
        public RectangleF Bounds
        {
            get { return new RectangleF(Left, Top, Width, Height); }
            set
            {
                Left = value.Left;
                Top = value.Top;
                Width = value.Width;
                Height = value.Height;
            }
        }

        /// <summary>
        /// Gets or sets the size of client area of the object.
        /// </summary>
        /// <remarks>
        /// This property is used in the <see cref="FastReport.Dialog.DialogPage"/> class.
        /// </remarks>
        [Browsable(false)]
        public virtual SizeF ClientSize
        {
            get { return new SizeF(Width, Height); }
            set
            {
                Width = value.Width;
                Height = value.Height;
            }
        }

        /// <summary>
        /// Gets or sets which control borders are docked to its parent control and determines how a control
        /// is resized with its parent.
        /// </summary>
        /// <remarks>
        /// <para>Use the <b>Dock</b> property to define how a control is automatically resized as its parent control is
        /// resized. For example, setting Dock to <c>DockStyle.Left</c> causes the control to align itself with the
        /// left edges of its parent control and to resize as the parent control is resized.</para>
        /// <para>A control can be docked to one edge of its parent container or can be docked to all edges and
        /// fill the parent container.</para>
        /// </remarks>
        [DefaultValue(DockStyle.None)]
        [Category("Layout")]
        public virtual DockStyle Dock
        {
            get { return dock; }
            set
            {
                if (dock != value)
                {
                    dock = value;
                    if (Parent != null)
                        (Parent as IParent).UpdateLayout(0, 0);
                }
            }
        }

        /// <summary>
        /// Gets or sets a group index.
        /// </summary>
        /// <remarks>
        /// Group index is used to group objects in the designer (using "Group" button). When you select
        /// any object in a group, entire group becomes selected. To reset a group, set the <b>GroupIndex</b>
        /// to 0 (default value).
        /// </remarks>
        [Browsable(false)]
        public int GroupIndex
        {
            get { return groupIndex; }
            set { groupIndex = value; }
        }

        /// <summary>
        /// Gets or sets the height of the object.
        /// </summary>
        /// <remarks>
        /// This property value is measured in the screen pixels. Use <see cref="Units"/> class to
        /// convert a value to desired units.
        /// </remarks>
        /// <example>The following example demonstrates how to convert between pixels and units:<code>
        /// TextObject text1;
        /// // set Height to 10mm
        /// text1.Height = Units.Millimeters * 10;
        /// // convert a value to millimeters
        /// MessageBox.Show("Height = " + (text1.Height / Units.Millimeters).ToString() + "mm");
        /// </code></example>
        [Category("Layout")]
        public virtual float Height
        {
            get { return height; }
            set
            {
                value = (float)Math.Round(value, 2);
                if (FloatDiff(height, value))
                {
                    if (!IsDesigning || !HasRestriction(Restrictions.DontResize))
                    {
                        if (this is IParent)
                            (this as IParent).UpdateLayout(0, value - height);
                        height = value;
                        if (Dock != DockStyle.None && Parent != null)
                            (Parent as IParent).UpdateLayout(0, 0);
                    }
                }
            }
        }

        /// <summary>
        /// Gets or sets the left coordinate of the object in relation to its container.
        /// </summary>
        /// <remarks>
        ///   <para>
        ///         This property value is measured in the screen pixels. Use
        ///         <see cref="Units"/> class to convert a value to desired units.
        ///     </para>
        ///   <para>
        ///         To obtain absolute coordinate, use <see cref="AbsLeft"/> property.
        ///     </para>
        /// </remarks>
        /// <example>The following example demonstrates how to convert between pixels and units:<code>
        /// TextObject text1;
        /// // set Left to 10mm
        /// text1.Left = Units.Millimeters * 10;
        /// // convert a value to millimeters
        /// MessageBox.Show("Left = " + (text1.Left / Units.Millimeters).ToString() + "mm");
        /// </code></example>
        [Category("Layout")]
        public virtual float Left
        {
            get { return left; }
            set
            {
                value = (float)Math.Round(value, 2);
                if (!IsDesigning || !HasRestriction(Restrictions.DontMove))
                {
                    left = value;
                    if (Dock != DockStyle.None && Parent != null)
                        (Parent as IParent).UpdateLayout(0, 0);
                }
            }
        }

        /// <summary>
        /// Gets the right coordinate of the object in relation to its container.
        /// </summary>
        /// <remarks>
        /// To change the right coordinate, change the <see cref="Left"/> and/or <see cref="Width"/> properties.
        /// </remarks>
        [Browsable(false)]
        public float Right
        {
            get { return Left + Width; }
        }

        /// <summary>
        /// Gets or sets the Tag string for this component.
        /// </summary>
        [Category("Design")]
        public string Tag
        {
            get { return tag; }
            set { tag = value; }
        }

        /// <summary>
        /// Gets or sets the top coordinate of the object in relation to its container.
        /// </summary>
        /// <remarks>
        ///   <para>
        ///         This property value is measured in the screen pixels. Use
        ///         <see cref="Units"/> class to convert a value to desired units.
        ///     </para>
        ///   <para>
        ///         To obtain absolute coordinate, use <see cref="AbsTop"/> property.
        ///     </para>
        /// </remarks>
        /// <example>The following example demonstrates how to convert between pixels and units:<code>
        /// TextObject text1;
        /// // set Top to 10mm
        /// text1.Top = Units.Millimeters * 10;
        /// // convert a value to millimeters
        /// MessageBox.Show("Top = " + (text1.Top / Units.Millimeters).ToString() + "mm");
        /// </code></example>
        [Category("Layout")]
        public virtual float Top
        {
            get { return top; }
            set
            {
                value = (float)Math.Round(value, 2);
                if (!IsDesigning || !HasRestriction(Restrictions.DontMove))
                {
                    top = value;
                    if (Dock != DockStyle.None && Parent != null)
                        (Parent as IParent).UpdateLayout(0, 0);
                }
            }
        }

        /// <summary>
        /// Gets or sets a value indicating whether the object is displayed in the preview window.
        /// </summary>
        /// <remarks>
        /// Setting this property to <b>false</b> will hide the object in the preview window.
        /// </remarks>
        /// <example>The following report script will control the Text1 visibility depending on the value of the
        /// data column:<code>
        /// private void Data1_BeforePrint(object sender, EventArgs e)
        /// {
        ///   Text1.Visible = [Orders.Shipped] == true;
        /// }
        /// </code></example>
        [DefaultValue(true)]
        [Category("Behavior")]
        public virtual bool Visible
        {
            get { return visible; }
            set { visible = value; }
        }

        /// <summary>
        /// Gets or sets a string containing expression that determines should be object displayed in the preview window.
        /// </summary>
        [DefaultValue("")]
        [Category("Behavior")]
        [Editor("FastReport.TypeEditors.ExpressionEditor, FastReport", typeof(UITypeEditor))]
        public virtual string VisibleExpression
        {
            get { return visibleExpression; }
            set { visibleExpression = value; }
        }

        /// <summary>
        /// Gets or sets a value that determines if the object can be printed on the printer.
        /// </summary>
        /// <remarks>
        /// Object with Printable = <b>false</b> is still visible in the preview window, but not on the printout.
        /// If you want to hide an object in the preview, set the <see cref="ComponentBase.Visible"/> property to <b>false</b>.
        /// </remarks>
        [DefaultValue(true)]
        [Category("Behavior")]
        public bool Printable
        {
            get { return printable; }
            set { printable = value; }
        }

        /// <summary>
        /// Gets or sets a string containing expression that determines should be object printed on the printer.
        /// </summary>
        [DefaultValue("")]
        [Category("Behavior")]
        [Editor("FastReport.TypeEditors.ExpressionEditor, FastReport", typeof(UITypeEditor))]
        public string PrintableExpression
        {
            get { return printableExpression; }
            set { printableExpression = value; }
        }

        /// <summary>
        /// Gets or sets the width of the object.
        /// </summary>
        /// <remarks>
        /// This property value is measured in the screen pixels. Use <see cref="Units"/> class to
        /// convert a value to desired units.
        /// </remarks>
        /// <example>The following example demonstrates how to convert between pixels and units:<code>
        /// TextObject text1;
        /// // set Width to 10mm
        /// text1.Width = Units.Millimeters * 10;
        /// // convert a value to millimeters
        /// MessageBox.Show("Width = " + (text1.Width / Units.Millimeters).ToString() + "mm");
        /// </code></example>
        [Category("Layout")]
        public virtual float Width
        {
            get { return width; }
            set
            {
                value = (float)Math.Round(value, 2);
                if (FloatDiff(width, value))
                {
                    if (!IsDesigning || !HasRestriction(Restrictions.DontResize))
                    {
                        if (this is IParent)
                            (this as IParent).UpdateLayout(value - width, 0);
                        width = value;
                        if (Dock != DockStyle.None && Parent != null)
                            (Parent as IParent).UpdateLayout(0, 0);
                    }
                }
            }
        }

        #endregion Properties

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="ComponentBase"/> class with default settings.
        /// </summary>
        public ComponentBase()
        {
            anchor = AnchorStyles.Left | AnchorStyles.Top;
            visible = true;
            visibleExpression = "";
            printable = true;
            printableExpression = "";
            SetFlags(Flags.CanWriteBounds | Flags.HasGlobalName, true);
            tag = "";
        }

        #endregion Constructors

        #region Public Methods

        /// <inheritdoc/>
        public override void Assign(Base source)
        {
            base.Assign(source);

            ComponentBase src = source as ComponentBase;
            Left = src.Left;
            Top = src.Top;
            Width = src.Width;
            Height = src.Height;
            Dock = src.Dock;
            Anchor = src.Anchor;
            Visible = src.Visible;
            VisibleExpression = src.VisibleExpression;
            Printable = src.Printable;
            PrintableExpression = src.PrintableExpression;
            Tag = src.Tag;
        }

        /// <inheritdoc/>
        public override void Serialize(FRWriter writer)
        {
            ComponentBase c = writer.DiffObject as ComponentBase;
            base.Serialize(writer);

            if (Printable != c.Printable)
                writer.WriteBool("Printable", Printable);
            if (PrintableExpression != c.PrintableExpression)
                writer.WriteStr("PrintableExpression", PrintableExpression);
            if (HasFlag(Flags.CanWriteBounds))
            {
                if (FloatDiff(Left, c.Left))
                    writer.WriteFloat("Left", Left);
                if (FloatDiff(Top, c.Top))
                    writer.WriteFloat("Top", Top);
                if (FloatDiff(Width, c.Width))
                    writer.WriteFloat("Width", Width);
                if (FloatDiff(Height, c.Height))
                    writer.WriteFloat("Height", Height);
            }
            if (writer.SerializeTo != SerializeTo.Preview)
            {
                if (Dock != c.Dock)
                    writer.WriteValue("Dock", Dock);
                if (Anchor != c.Anchor)
                    writer.WriteValue("Anchor", Anchor);
                if (Visible != c.Visible)
                    writer.WriteBool("Visible", Visible);
                if (VisibleExpression != c.VisibleExpression)
                    writer.WriteStr("VisibleExpression", VisibleExpression);
                if (GroupIndex != c.GroupIndex)
                    writer.WriteInt("GroupIndex", GroupIndex);
            }
            if (Tag != c.Tag)
                writer.WriteStr("Tag", Tag);
        }

        #endregion Public Methods

        #region Report Engine

        /// <inheritdoc/>
        public override string[] GetExpressions()
        {
            List<string> expressions = new List<string>();

            string[] baseExpressions = base.GetExpressions();
            if (baseExpressions != null)
            {
                expressions.AddRange(baseExpressions);
            }

            if (!String.IsNullOrEmpty(VisibleExpression))
            {
                string expression = Code.CodeUtils.FixExpressionWithBrackets(VisibleExpression);
                if (expression.ToLower() == "true" || expression.ToLower() == "false")
                {
                    expression = expression.ToLower();
                }
                expressions.Add(expression);
            }

            if (!String.IsNullOrEmpty(PrintableExpression))
            {
                string expression = Code.CodeUtils.FixExpressionWithBrackets(PrintableExpression);
                if (expression.ToLower() == "true" || expression.ToLower() == "false")
                {
                    expression = expression.ToLower();
                }
                expressions.Add(expression);
            }

            return expressions.ToArray();
        }

        /// <summary>
        /// Caclulates visible expression value.
        /// </summary>
        /// <param name="expression">The expression to calculate.</param>
        /// <returns>The result of calculation.</returns>
        public bool CalcVisibleExpression(string expression)
        {
            bool result = true;

            object expressionObj = null;
            // Calculate expressions with TotalPages only on FinalPass.
            if (!expression.Contains("TotalPages") || (Report.DoublePass && Report.Engine.FinalPass))
            {
                expressionObj = Report.Calc(Code.CodeUtils.FixExpressionWithBrackets(expression));
            }
            if (expressionObj != null && expressionObj is bool)
            {
                if (!expression.Contains("TotalPages"))
                {
                    result = (bool)expressionObj;
                }
                else if (Report.Engine.FirstPass)
                {
                    result = true;
                }
                else
                {
                    result = (bool)expressionObj;
                }
            }

            return result;
        }

        #endregion Report Engine
    }
}