// Copyright 2017 Baliance. All rights reserved.
//
// Use of this source code is governed by the terms of the Affero GNU General
// Public License version 3.0 as published by the Free Software Foundation and
// appearing in the file LICENSE included in the packaging of this file. A
// commercial license can be purchased by contacting sales@baliance.com.

package document

import (
	"baliance.com/gooxml/schema/soo/wml"
)

// Paragraph is a paragraph within a document.
type Paragraph struct {
	d *Document
	x *wml.CT_P
}

// X returns the inner wrapped XML type.
func (p Paragraph) X() *wml.CT_P {
	return p.x
}

func (p Paragraph) ensurePPr() {
	if p.x.PPr == nil {
		p.x.PPr = wml.NewCT_PPr()
	}
}

// Remove removes the paragraph from its parent element, effectively deleting it
// from a document.
func (p Paragraph) Remove() {
	p.d.removeParagraph(p.x)
}

// removeChildRun removes a child run from a paragraph.
func (p Paragraph) removeChildRun(rr *wml.CT_R) {
	for _, c := range p.x.EG_PContent {
		for i, rc := range c.EG_ContentRunContent {
			if rc.R == rr {
				copy(c.EG_ContentRunContent[i:], c.EG_ContentRunContent[i+1:])
				c.EG_ContentRunContent = c.EG_ContentRunContent[0 : len(c.EG_ContentRunContent)-1]
			}
			if rc.Sdt != nil && rc.Sdt.SdtContent != nil {
				for i, rc2 := range rc.Sdt.SdtContent.EG_ContentRunContent {
					if rc2.R == rr {
						copy(rc.Sdt.SdtContent.EG_ContentRunContent[i:], rc.Sdt.SdtContent.EG_ContentRunContent[i+1:])
						rc.Sdt.SdtContent.EG_ContentRunContent = rc.Sdt.SdtContent.EG_ContentRunContent[0 : len(rc.Sdt.SdtContent.EG_ContentRunContent)-1]
					}
				}
			}
		}
	}
}

// Properties returns the paragraph properties.
func (p Paragraph) Properties() ParagraphProperties {
	p.ensurePPr()
	return ParagraphProperties{p.d, p.x.PPr}
}

// Style returns the style for a paragraph, or an empty string if it is unset.
func (p Paragraph) Style() string {
	if p.x.PPr != nil && p.x.PPr.PStyle != nil {
		return p.x.PPr.PStyle.ValAttr
	}
	return ""
}

// SetStyle sets the style of a paragraph and is identical to setting it on the
// paragraph's Properties()
func (p Paragraph) SetStyle(s string) {
	p.ensurePPr()
	if s == "" {
		p.x.PPr.PStyle = nil
	} else {
		p.x.PPr.PStyle = wml.NewCT_String()
		p.x.PPr.PStyle.ValAttr = s
	}
}

// AddRun adds a run to a paragraph.
func (p Paragraph) AddRun() Run {
	pc := wml.NewEG_PContent()
	p.x.EG_PContent = append(p.x.EG_PContent, pc)

	rc := wml.NewEG_ContentRunContent()
	pc.EG_ContentRunContent = append(pc.EG_ContentRunContent, rc)
	r := wml.NewCT_R()
	rc.R = r
	return Run{p.d, p.x, r}
}

// Runs returns all of the runs in a paragraph.
func (p Paragraph) Runs() []Run {
	ret := []Run{}
	for _, c := range p.x.EG_PContent {
		for _, rc := range c.EG_ContentRunContent {
			if rc.R != nil {
				ret = append(ret, Run{p.d, p.x, rc.R})
			}
			if rc.Sdt != nil && rc.Sdt.SdtContent != nil {
				for _, rc2 := range rc.Sdt.SdtContent.EG_ContentRunContent {
					if rc2.R != nil {
						ret = append(ret, Run{p.d, p.x, rc2.R})
					}
				}
			}
		}
	}
	return ret
}

// InsertRunAfter inserts a run in the paragraph after the relative run.
func (p Paragraph) InsertRunAfter(relativeTo Run) Run {
	return p.insertRun(relativeTo, false)
}

// InsertRunBefore inserts a run in the paragraph before the relative run.
func (p Paragraph) InsertRunBefore(relativeTo Run) Run {
	return p.insertRun(relativeTo, true)
}

func (p Paragraph) insertRun(relativeTo Run, before bool) Run {
	for _, c := range p.x.EG_PContent {
		for i, rc := range c.EG_ContentRunContent {
			if rc.R == relativeTo.X() {
				r := wml.NewCT_R()
				c.EG_ContentRunContent = append(c.EG_ContentRunContent, nil)
				if before {
					copy(c.EG_ContentRunContent[i+1:], c.EG_ContentRunContent[i:])
					c.EG_ContentRunContent[i] = wml.NewEG_ContentRunContent()
					c.EG_ContentRunContent[i].R = r
				} else {
					copy(c.EG_ContentRunContent[i+2:], c.EG_ContentRunContent[i+1:])
					c.EG_ContentRunContent[i+1] = wml.NewEG_ContentRunContent()
					c.EG_ContentRunContent[i+1].R = r
				}
				return Run{p.d, p.X(), r}

			}
			if rc.Sdt != nil && rc.Sdt.SdtContent != nil {
				for _, rc2 := range rc.Sdt.SdtContent.EG_ContentRunContent {
					if rc2.R == relativeTo.X() {
						r := wml.NewCT_R()
						rc.Sdt.SdtContent.EG_ContentRunContent = append(rc.Sdt.SdtContent.EG_ContentRunContent, nil)
						if before {
							copy(rc.Sdt.SdtContent.EG_ContentRunContent[i+1:], rc.Sdt.SdtContent.EG_ContentRunContent[i:])
							rc.Sdt.SdtContent.EG_ContentRunContent[i] = wml.NewEG_ContentRunContent()
							rc.Sdt.SdtContent.EG_ContentRunContent[i].R = r
						} else {
							copy(rc.Sdt.SdtContent.EG_ContentRunContent[i+2:], rc.Sdt.SdtContent.EG_ContentRunContent[i+1:])
							rc.Sdt.SdtContent.EG_ContentRunContent[i+1] = wml.NewEG_ContentRunContent()
							rc.Sdt.SdtContent.EG_ContentRunContent[i+1].R = r
						}
						return Run{p.d, p.X(), r}
					}
				}
			}
		}
	}
	return p.AddRun()
}

func (p Paragraph) AddHyperLink() HyperLink {
	pc := wml.NewEG_PContent()
	p.x.EG_PContent = append(p.x.EG_PContent, pc)

	pc.Hyperlink = wml.NewCT_Hyperlink()
	return HyperLink{p.d, pc.Hyperlink}
}