// Copyright 2016 - 2023 The excelize Authors. All rights reserved. Use of
// this source code is governed by a BSD-style license that can be found in
// the LICENSE file.
//
// Package excelize providing a set of functions that allow you to write to and
// read from XLAM / XLSM / XLSX / XLTM / XLTX files. Supports reading and
// writing spreadsheet documents generated by Microsoft Excel™ 2007 and later.
// Supports complex components by high compatibility, and provided streaming
// API for generating or reading data from a worksheet with huge amounts of
// data. This library needs Go version 1.16 or later.

package excelize

import (
	"bytes"
	"encoding/xml"
	"fmt"
	"io"
	"path/filepath"
	"strconv"
	"strings"
)

// GetComments retrieves all comments in a worksheet by given worksheet name.
func (f *File) GetComments(sheet string) ([]Comment, error) {
	var comments []Comment
	sheetXMLPath, ok := f.getSheetXMLPath(sheet)
	if !ok {
		return comments, newNoExistSheetError(sheet)
	}
	commentsXML := f.getSheetComments(filepath.Base(sheetXMLPath))
	if !strings.HasPrefix(commentsXML, "/") {
		commentsXML = "xl" + strings.TrimPrefix(commentsXML, "..")
	}
	commentsXML = strings.TrimPrefix(commentsXML, "/")
	cmts, err := f.commentsReader(commentsXML)
	if err != nil {
		return comments, err
	}
	if cmts != nil {
		for _, cmt := range cmts.CommentList.Comment {
			comment := Comment{}
			if cmt.AuthorID < len(cmts.Authors.Author) {
				comment.Author = cmts.Authors.Author[cmt.AuthorID]
			}
			comment.Cell = cmt.Ref
			comment.AuthorID = cmt.AuthorID
			if cmt.Text.T != nil {
				comment.Text += *cmt.Text.T
			}
			for _, text := range cmt.Text.R {
				if text.T != nil {
					run := RichTextRun{Text: text.T.Val}
					if text.RPr != nil {
						run.Font = newFont(text.RPr)
					}
					comment.Runs = append(comment.Runs, run)
				}
			}
			comments = append(comments, comment)
		}
	}
	return comments, nil
}

// getSheetComments provides the method to get the target comment reference by
// given worksheet file path.
func (f *File) getSheetComments(sheetFile string) string {
	rels, _ := f.relsReader("xl/worksheets/_rels/" + sheetFile + ".rels")
	if sheetRels := rels; sheetRels != nil {
		sheetRels.Lock()
		defer sheetRels.Unlock()
		for _, v := range sheetRels.Relationships {
			if v.Type == SourceRelationshipComments {
				return v.Target
			}
		}
	}
	return ""
}

// AddComment provides the method to add comment in a sheet by given worksheet
// index, cell and format set (such as author and text). Note that the max
// author length is 255 and the max text length is 32512. For example, add a
// comment in Sheet1!$A$30:
//
//	err := f.AddComment("Sheet1", excelize.Comment{
//	    Cell:   "A12",
//	    Author: "Excelize",
//	    Runs: []excelize.RichTextRun{
//	        {Text: "Excelize: ", Font: &excelize.Font{Bold: true}},
//	        {Text: "This is a comment."},
//	    },
//	})
func (f *File) AddComment(sheet string, comment Comment) error {
	// Read sheet data.
	ws, err := f.workSheetReader(sheet)
	if err != nil {
		return err
	}
	commentID := f.countComments() + 1
	drawingVML := "xl/drawings/vmlDrawing" + strconv.Itoa(commentID) + ".vml"
	sheetRelationshipsComments := "../comments" + strconv.Itoa(commentID) + ".xml"
	sheetRelationshipsDrawingVML := "../drawings/vmlDrawing" + strconv.Itoa(commentID) + ".vml"
	if ws.LegacyDrawing != nil {
		// The worksheet already has a comments relationships, use the relationships drawing ../drawings/vmlDrawing%d.vml.
		sheetRelationshipsDrawingVML = f.getSheetRelationshipsTargetByID(sheet, ws.LegacyDrawing.RID)
		commentID, _ = strconv.Atoi(strings.TrimSuffix(strings.TrimPrefix(sheetRelationshipsDrawingVML, "../drawings/vmlDrawing"), ".vml"))
		drawingVML = strings.ReplaceAll(sheetRelationshipsDrawingVML, "..", "xl")
	} else {
		// Add first comment for given sheet.
		sheetXMLPath, _ := f.getSheetXMLPath(sheet)
		sheetRels := "xl/worksheets/_rels/" + strings.TrimPrefix(sheetXMLPath, "xl/worksheets/") + ".rels"
		rID := f.addRels(sheetRels, SourceRelationshipDrawingVML, sheetRelationshipsDrawingVML, "")
		f.addRels(sheetRels, SourceRelationshipComments, sheetRelationshipsComments, "")
		f.addSheetNameSpace(sheet, SourceRelationship)
		f.addSheetLegacyDrawing(sheet, rID)
	}
	commentsXML := "xl/comments" + strconv.Itoa(commentID) + ".xml"
	var rows, cols int
	for _, runs := range comment.Runs {
		for _, subStr := range strings.Split(runs.Text, "\n") {
			rows++
			if chars := len(subStr); chars > cols {
				cols = chars
			}
		}
	}
	if len(comment.Runs) == 0 {
		rows, cols = 1, len(comment.Text)
	}
	if err = f.addDrawingVML(commentID, drawingVML, comment.Cell, rows+1, cols); err != nil {
		return err
	}
	if err = f.addComment(commentsXML, comment); err != nil {
		return err
	}
	return f.addContentTypePart(commentID, "comments")
}

// DeleteComment provides the method to delete comment in a sheet by given
// worksheet name. For example, delete the comment in Sheet1!$A$30:
//
//	err := f.DeleteComment("Sheet1", "A30")
func (f *File) DeleteComment(sheet, cell string) error {
	if err := checkSheetName(sheet); err != nil {
		return err
	}
	sheetXMLPath, ok := f.getSheetXMLPath(sheet)
	if !ok {
		return newNoExistSheetError(sheet)
	}
	commentsXML := f.getSheetComments(filepath.Base(sheetXMLPath))
	if !strings.HasPrefix(commentsXML, "/") {
		commentsXML = "xl" + strings.TrimPrefix(commentsXML, "..")
	}
	commentsXML = strings.TrimPrefix(commentsXML, "/")
	cmts, err := f.commentsReader(commentsXML)
	if err != nil {
		return err
	}
	if cmts != nil {
		for i := 0; i < len(cmts.CommentList.Comment); i++ {
			cmt := cmts.CommentList.Comment[i]
			if cmt.Ref != cell {
				continue
			}
			if len(cmts.CommentList.Comment) > 1 {
				cmts.CommentList.Comment = append(
					cmts.CommentList.Comment[:i],
					cmts.CommentList.Comment[i+1:]...,
				)
				i--
				continue
			}
			cmts.CommentList.Comment = nil
		}
		f.Comments[commentsXML] = cmts
	}
	return err
}

// addDrawingVML provides a function to create comment as
// xl/drawings/vmlDrawing%d.vml by given commit ID and cell.
func (f *File) addDrawingVML(commentID int, drawingVML, cell string, lineCount, colCount int) error {
	col, row, err := CellNameToCoordinates(cell)
	if err != nil {
		return err
	}
	yAxis := col - 1
	xAxis := row - 1
	vml := f.VMLDrawing[drawingVML]
	if vml == nil {
		vml = &vmlDrawing{
			XMLNSv:  "urn:schemas-microsoft-com:vml",
			XMLNSo:  "urn:schemas-microsoft-com:office:office",
			XMLNSx:  "urn:schemas-microsoft-com:office:excel",
			XMLNSmv: "http://macVmlSchemaUri",
			Shapelayout: &xlsxShapelayout{
				Ext: "edit",
				IDmap: &xlsxIDmap{
					Ext:  "edit",
					Data: commentID,
				},
			},
			Shapetype: &xlsxShapetype{
				ID:        "_x0000_t202",
				Coordsize: "21600,21600",
				Spt:       202,
				Path:      "m0,0l0,21600,21600,21600,21600,0xe",
				Stroke: &xlsxStroke{
					Joinstyle: "miter",
				},
				VPath: &vPath{
					Gradientshapeok: "t",
					Connecttype:     "rect",
				},
			},
		}
		// load exist comment shapes from xl/drawings/vmlDrawing%d.vml
		d, err := f.decodeVMLDrawingReader(drawingVML)
		if err != nil {
			return err
		}
		if d != nil {
			for _, v := range d.Shape {
				s := xlsxShape{
					ID:          "_x0000_s1025",
					Type:        "#_x0000_t202",
					Style:       "position:absolute;73.5pt;width:108pt;height:59.25pt;z-index:1;visibility:hidden",
					Fillcolor:   "#FBF6D6",
					Strokecolor: "#EDEAA1",
					Val:         v.Val,
				}
				vml.Shape = append(vml.Shape, s)
			}
		}
	}
	sp := encodeShape{
		Fill: &vFill{
			Color2: "#FBFE82",
			Angle:  -180,
			Type:   "gradient",
			Fill: &oFill{
				Ext:  "view",
				Type: "gradientUnscaled",
			},
		},
		Shadow: &vShadow{
			On:       "t",
			Color:    "black",
			Obscured: "t",
		},
		Path: &vPath{
			Connecttype: "none",
		},
		Textbox: &vTextbox{
			Style: "mso-direction-alt:auto",
			Div: &xlsxDiv{
				Style: "text-align:left",
			},
		},
		ClientData: &xClientData{
			ObjectType: "Note",
			Anchor: fmt.Sprintf(
				"%d, 23, %d, 0, %d, %d, %d, 5",
				1+yAxis, 1+xAxis, 2+yAxis+lineCount, colCount+yAxis, 2+xAxis+lineCount),
			AutoFill: "True",
			Row:      xAxis,
			Column:   yAxis,
		},
	}
	s, _ := xml.Marshal(sp)
	shape := xlsxShape{
		ID:          "_x0000_s1025",
		Type:        "#_x0000_t202",
		Style:       "position:absolute;73.5pt;width:108pt;height:59.25pt;z-index:1;visibility:hidden",
		Fillcolor:   "#FBF6D6",
		Strokecolor: "#EDEAA1",
		Val:         string(s[13 : len(s)-14]),
	}
	vml.Shape = append(vml.Shape, shape)
	f.VMLDrawing[drawingVML] = vml
	return err
}

// addComment provides a function to create chart as xl/comments%d.xml by
// given cell and format sets.
func (f *File) addComment(commentsXML string, comment Comment) error {
	if comment.Author == "" {
		comment.Author = "Author"
	}
	if len(comment.Author) > MaxFieldLength {
		comment.Author = comment.Author[:MaxFieldLength]
	}
	cmts, err := f.commentsReader(commentsXML)
	if err != nil {
		return err
	}
	var authorID int
	if cmts == nil {
		cmts = &xlsxComments{Authors: xlsxAuthor{Author: []string{comment.Author}}}
	}
	if inStrSlice(cmts.Authors.Author, comment.Author, true) == -1 {
		cmts.Authors.Author = append(cmts.Authors.Author, comment.Author)
		authorID = len(cmts.Authors.Author) - 1
	}
	defaultFont, err := f.GetDefaultFont()
	if err != nil {
		return err
	}
	chars, cmt := 0, xlsxComment{
		Ref:      comment.Cell,
		AuthorID: authorID,
		Text:     xlsxText{R: []xlsxR{}},
	}
	if comment.Text != "" {
		if len(comment.Text) > TotalCellChars {
			comment.Text = comment.Text[:TotalCellChars]
		}
		cmt.Text.T = stringPtr(comment.Text)
		chars += len(comment.Text)
	}
	for _, run := range comment.Runs {
		if chars == TotalCellChars {
			break
		}
		if chars+len(run.Text) > TotalCellChars {
			run.Text = run.Text[:TotalCellChars-chars]
		}
		chars += len(run.Text)
		r := xlsxR{
			RPr: &xlsxRPr{
				Sz: &attrValFloat{Val: float64Ptr(9)},
				Color: &xlsxColor{
					Indexed: 81,
				},
				RFont:  &attrValString{Val: stringPtr(defaultFont)},
				Family: &attrValInt{Val: intPtr(2)},
			},
			T: &xlsxT{Val: run.Text, Space: xml.Attr{
				Name:  xml.Name{Space: NameSpaceXML, Local: "space"},
				Value: "preserve",
			}},
		}
		if run.Font != nil {
			r.RPr = newRpr(run.Font)
		}
		cmt.Text.R = append(cmt.Text.R, r)
	}
	cmts.CommentList.Comment = append(cmts.CommentList.Comment, cmt)
	f.Comments[commentsXML] = cmts
	return err
}

// countComments provides a function to get comments files count storage in
// the folder xl.
func (f *File) countComments() int {
	c1, c2 := 0, 0
	f.Pkg.Range(func(k, v interface{}) bool {
		if strings.Contains(k.(string), "xl/comments") {
			c1++
		}
		return true
	})
	for rel := range f.Comments {
		if strings.Contains(rel, "xl/comments") {
			c2++
		}
	}
	if c1 < c2 {
		return c2
	}
	return c1
}

// decodeVMLDrawingReader provides a function to get the pointer to the
// structure after deserialization of xl/drawings/vmlDrawing%d.xml.
func (f *File) decodeVMLDrawingReader(path string) (*decodeVmlDrawing, error) {
	if f.DecodeVMLDrawing[path] == nil {
		c, ok := f.Pkg.Load(path)
		if ok && c != nil {
			f.DecodeVMLDrawing[path] = new(decodeVmlDrawing)
			if err := f.xmlNewDecoder(bytes.NewReader(namespaceStrictToTransitional(c.([]byte)))).
				Decode(f.DecodeVMLDrawing[path]); err != nil && err != io.EOF {
				return nil, err
			}
		}
	}
	return f.DecodeVMLDrawing[path], nil
}

// vmlDrawingWriter provides a function to save xl/drawings/vmlDrawing%d.xml
// after serialize structure.
func (f *File) vmlDrawingWriter() {
	for path, vml := range f.VMLDrawing {
		if vml != nil {
			v, _ := xml.Marshal(vml)
			f.Pkg.Store(path, v)
		}
	}
}

// commentsReader provides a function to get the pointer to the structure
// after deserialization of xl/comments%d.xml.
func (f *File) commentsReader(path string) (*xlsxComments, error) {
	if f.Comments[path] == nil {
		content, ok := f.Pkg.Load(path)
		if ok && content != nil {
			f.Comments[path] = new(xlsxComments)
			if err := f.xmlNewDecoder(bytes.NewReader(namespaceStrictToTransitional(content.([]byte)))).
				Decode(f.Comments[path]); err != nil && err != io.EOF {
				return nil, err
			}
		}
	}
	return f.Comments[path], nil
}

// commentsWriter provides a function to save xl/comments%d.xml after
// serialize structure.
func (f *File) commentsWriter() {
	for path, c := range f.Comments {
		if c != nil {
			v, _ := xml.Marshal(c)
			f.saveFileList(path, v)
		}
	}
}