// 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 spreadsheet

import (
	"errors"
	"strconv"

	"baliance.com/gooxml"
	sml "baliance.com/gooxml/schema/schemas.openxmlformats.org/spreadsheetml"
	"baliance.com/gooxml/spreadsheet/styles"
)

// Cell is a single cell within a sheet.
type Cell struct {
	w *Workbook
	x *sml.CT_Cell
}

// X returns the inner wrapped XML type.
func (c Cell) X() *sml.CT_Cell {
	return c.x
}

// SetInlineString adds a string inline instead of in the shared strings table.
func (c Cell) SetInlineString(s string) {
	c.x.Is = sml.NewCT_Rst()
	c.x.Is.T = gooxml.String(s)
	c.x.TAttr = sml.ST_CellTypeInlineStr
}

// SetFormulaRaw sets the cell type to formula, and the raw formula to the given string
func (c Cell) SetFormulaRaw(s string) {
	c.x.TAttr = sml.ST_CellTypeStr
	c.x.F = sml.NewCT_CellFormula()
	c.x.F.Content = s
	c.x.V = nil
}

// SetString sets the cell type to string, and the value to the given string,
// returning an ID from the shared strings table. To reuse a string, call
// SetStringByID with the ID returned.
func (c Cell) SetString(s string) int {
	id := c.w.SharedStrings.AddString(s)
	c.x.V = gooxml.String(strconv.Itoa(id))
	c.x.TAttr = sml.ST_CellTypeS
	return id
}

// SetStringByID sets the cell type to string, and the value a string in the
// shared strings table.
func (c Cell) SetStringByID(id int) {
	c.x.V = gooxml.String(strconv.Itoa(id))
	c.x.TAttr = sml.ST_CellTypeS
}

// SetNumber sets the cell type to number, and the value to the given number
func (c Cell) SetNumber(v float64) {
	c.x.V = gooxml.String(strconv.FormatFloat(v, 'g', -1, 64))
	// cell type number
	c.x.TAttr = sml.ST_CellTypeN
}

// SetBool sets the cell type to boolean and the value to the given boolean value.
func (c Cell) SetBool(v bool) {
	c.x.V = gooxml.String(strconv.Itoa(boolToInt(v)))
	c.x.TAttr = sml.ST_CellTypeB
}

// SetStyle applies a style to the cell.  This style is referenced in the generated XML
// via CellStyle.Index().
func (c Cell) SetStyle(cs styles.CellStyle) {
	c.x.SAttr = gooxml.Uint32(cs.Index())
}

func (c Cell) GetValue() (string, error) {
	switch c.x.TAttr {
	case sml.ST_CellTypeB:
		if c.x.V == nil {
			return "", nil
		}
		return *c.x.V, nil
	case sml.ST_CellTypeInlineStr:
		if c.x.Is == nil || c.x.Is.T == nil {
			return "", nil
		}
		return *c.x.Is.T, nil
	case sml.ST_CellTypeS:
		if c.x.V == nil {
			return "", nil
		}
		id, err := strconv.Atoi(*c.x.V)
		if err != nil {
			return "", err
		}
		return c.w.SharedStrings.GetString(id)
	case sml.ST_CellTypeE:
	case sml.ST_CellTypeN:
	case sml.ST_CellTypeStr:
	}
	return "", errors.New("unsupported cell type")
}
func boolToInt(v bool) int {
	if v {
		return 1
	}
	return 0
}