/*
   Copyright (c) 2020 gingfrederik
   Copyright (c) 2021 Gonzalo Fernandez-Victorio
   Copyright (c) 2021 Basement Crowd Ltd (https://www.basementcrowd.com)
   Copyright (c) 2023 Fumiama Minamoto (源文雨)

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Affero General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Affero General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

package docx

import (
	"encoding/xml"
	"io"
	"strings"
)

// RunStyle contains styling for a run
type RunStyle struct {
	XMLName xml.Name `xml:"w:rStyle,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// Style contains styling for a paragraph
type Style struct {
	XMLName xml.Name `xml:"w:pStyle,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// Color contains the sound of music. :D
// I'm kidding. It contains the color
type Color struct {
	XMLName xml.Name `xml:"w:color,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// Size contains the font size
type Size struct {
	XMLName xml.Name `xml:"w:sz,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// SizeCs contains the cs font size
type SizeCs struct {
	XMLName xml.Name `xml:"w:szCs,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// Bold ...
type Bold struct {
	XMLName xml.Name `xml:"w:b,omitempty"`
}

// Italic ...
type Italic struct {
	XMLName xml.Name `xml:"w:i,omitempty"`
}

// Underline ...
type Underline struct {
	XMLName xml.Name `xml:"w:u,omitempty"`
	Val     string   `xml:"w:val,attr,omitempty"`
}

// Highlight ...
type Highlight struct {
	XMLName xml.Name `xml:"w:highlight,omitempty"`
	Val     string   `xml:"w:val,attr,omitempty"`
}

// Kern ...
type Kern struct {
	XMLName xml.Name `xml:"w:kern,omitempty"`
	Val     int64    `xml:"w:val,attr"`
}

// Justification contains the way of the horizonal alignment
//
//	w:jc 属性的取值可以是以下之一：
//		start：左对齐。
//		center：居中对齐。
//		end：右对齐。
//		both：两端对齐。
//		distribute：分散对齐。
type Justification struct {
	XMLName xml.Name `xml:"w:jc,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// TextAlignment ...
type TextAlignment struct {
	XMLName xml.Name `xml:"w:textAlignment,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// VertAlign ...
type VertAlign struct {
	XMLName xml.Name `xml:"w:vertAlign,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// Strike ...
type Strike struct {
	XMLName xml.Name `xml:"w:strike,omitempty"`
	Val     string   `xml:"w:val,attr"`
}

// Shade is an element that represents a shading pattern applied to a document element.
type Shade struct {
	XMLName       xml.Name `xml:"w:shd,omitempty"`
	Val           string   `xml:"w:val,attr,omitempty"`
	Color         string   `xml:"w:color,attr,omitempty"`
	Fill          string   `xml:"w:fill,attr,omitempty"`
	ThemeFill     string   `xml:"w:themeFill,attr,omitempty"`
	ThemeFillTint string   `xml:"w:themeFillTint,attr,omitempty"`
}

// UnmarshalXML ...
func (s *Shade) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	for _, attr := range start.Attr {
		switch attr.Name.Local {
		case "val":
			s.Val = attr.Value
		case "color":
			s.Color = attr.Value
		case "fill":
			s.Fill = attr.Value
		case "themeFill":
			s.ThemeFill = attr.Value
		case "themeFillTint":
			s.ThemeFillTint = attr.Value
		default:
			// ignore other attributes
		}
	}
	// Consume the end element
	_, err := d.Token()
	return err
}

// AdjustRightInd ...
type AdjustRightInd struct {
	XMLName xml.Name `xml:"w:adjustRightInd,omitempty"`
	Val     int      `xml:"w:val,attr"`
}

// SnapToGrid ...
type SnapToGrid struct {
	XMLName xml.Name `xml:"w:snapToGrid,omitempty"`
	Val     int      `xml:"w:val,attr"`
}

// Kinsoku ...
type Kinsoku struct {
	XMLName xml.Name `xml:"w:kinsoku,omitempty"`
	Val     int      `xml:"w:val,attr"`
}

// OverflowPunct ...
type OverflowPunct struct {
	XMLName xml.Name `xml:"w:overflowPunct,omitempty"`
	Val     int      `xml:"w:val,attr"`
}

// ShapeProperties is a container element that represents the visual properties of a shape.
type ShapeProperties struct {
	BWMode string `xml:"bwMode,attr"`

	Xfrm      AXfrm
	PrstGeom  APrstGeom
	SolidFill *ASolidFill
	BlipFill  *ABlipFill
	NoFill    *struct{} `xml:"a:noFill,omitempty"`
	Line      *ALine

	// EffectList struct{} `xml:"a:effectLst"`
	// ExtList    struct{} `xml:"a:extLst"`
}

// UnmarshalXML ...
func (w *ShapeProperties) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
	for _, attr := range start.Attr {
		switch attr.Name.Local {
		case "bwMode":
			w.BWMode = attr.Value
		default:
			// ignore other attributes
		}
	}
	for {
		t, err := d.Token()
		if err == io.EOF {
			break
		}
		if err != nil {
			return err
		}

		if tt, ok := t.(xml.StartElement); ok {
			switch tt.Name.Local {
			case "xfrm":
				err = d.DecodeElement(&w.Xfrm, &tt)
				if err != nil && !strings.HasPrefix(err.Error(), "expected") {
					return err
				}
			case "prstGeom":
				w.PrstGeom.Prst = getAtt(tt.Attr, "prst")
			case "solidFill":
				var value ASolidFill
				err = d.DecodeElement(&value, &tt)
				if err != nil && !strings.HasPrefix(err.Error(), "expected") {
					return err
				}
				w.SolidFill = &value
			case "blipFill":
				var value ABlipFill
				err = d.DecodeElement(&value, &tt)
				if err != nil && !strings.HasPrefix(err.Error(), "expected") {
					return err
				}
				w.BlipFill = &value
			case "noFill":
				w.NoFill = &struct{}{}
			case "ln":
				var ln ALine
				err = d.DecodeElement(&ln, &tt)
				if err != nil && !strings.HasPrefix(err.Error(), "expected") {
					return err
				}
				w.Line = &ln
			default:
				err = d.Skip() // skip unsupported tags
				if err != nil {
					return err
				}
				continue
			}
		}
	}
	return nil
}

// NonVisualProperties is an element that represents the non-visual properties of a content control.
type NonVisualProperties struct {
	ID   int    `xml:"id,attr"`
	Name string `xml:"name,attr"`
}

// UnmarshalXML ...
func (r *NonVisualProperties) UnmarshalXML(d *xml.Decoder, start xml.StartElement) (err error) {
	for _, attr := range start.Attr {
		switch attr.Name.Local {
		case "id":
			r.ID, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "name":
			r.Name = attr.Value
		default:
			// ignore other attributes
		}
	}
	// Consume the end element
	_, err = d.Token()
	return
}

// Spacing ...
type Spacing struct {
	XMLName xml.Name `xml:"w:spacing,omitempty"`

	Val int `xml:"w:val,attr,omitempty"`

	BeforeLines int    `xml:"w:beforeLines,attr,omitempty"`
	Before      int    `xml:"w:before,attr,omitempty"`
	Line        int    `xml:"w:line,attr,omitempty"`
	LineRule    string `xml:"w:lineRule,attr,omitempty"`
}

// UnmarshalXML ...
func (s *Spacing) UnmarshalXML(d *xml.Decoder, start xml.StartElement) (err error) {
	for _, attr := range start.Attr {
		switch attr.Name.Local {
		case "val":
			s.Val, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "beforeLines":
			s.BeforeLines, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "before":
			s.Before, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "line":
			s.Line, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "lineRule":
			s.LineRule = attr.Value
		default:
			// ignore other attributes
		}
	}
	// Consume the end element
	_, err = d.Token()
	return
}

// Ind ...
type Ind struct {
	XMLName xml.Name `xml:"w:ind,omitempty"`

	LeftChars      int `xml:"w:leftChars,attr,omitempty"`
	Left           int `xml:"w:left,attr,omitempty"`
	FirstLineChars int `xml:"w:firstLineChars,attr,omitempty"`
	FirstLine      int `xml:"w:firstLine,attr,omitempty"`
	HangingChars   int `xml:"w:hangingChars,attr,omitempty"`
	Hanging        int `xml:"w:hanging,attr,omitempty"`
}

// UnmarshalXML ...
func (i *Ind) UnmarshalXML(d *xml.Decoder, start xml.StartElement) (err error) {
	for _, attr := range start.Attr {
		switch attr.Name.Local {
		case "leftChars":
			if attr.Value == "" {
				continue
			}
			i.LeftChars, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "left":
			if attr.Value == "" {
				continue
			}
			i.Left, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "firstLineChars":
			if attr.Value == "" {
				continue
			}
			i.FirstLineChars, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "firstLine":
			if attr.Value == "" {
				continue
			}
			i.FirstLine, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "hangingChars":
			if attr.Value == "" {
				continue
			}
			i.HangingChars, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		case "hanging":
			if attr.Value == "" {
				continue
			}
			i.Hanging, err = GetInt(attr.Value)
			if err != nil {
				return
			}
		default:
			// ignore other attributes
		}
	}
	// Consume the end element
	_, err = d.Token()
	return
}