package main

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"tildegit.org/sloum/tally/qline"
	"tildegit.org/sloum/tally/termios"
	"time"
)

const (
	Left          rune = 'h'
	Right         rune = 'l'
	Up            rune = 'k'
	Down          rune = 'j'
	Quit          rune = 'Q'
	Edit          rune = '\n'
	EditAlt       rune = ' '
	EditText      rune = '"'
	Del           rune = 'd'
	Com           rune = ':'
	ZoomIn        rune = '+'
	ZoomOut       rune = '-'
	Yank          rune = 'y'
	Paste         rune = 'p'
	PasteRelative rune = 'P'
	ToTop         rune = 'g'
	ToBottom      rune = 'G'
	RowStart      rune = '^'
	RowEnd        rune = '$'
	ModBold       rune = 'b'
	ModFaint      rune = 'f'
	ModItalic     rune = 'i'
	ModUnderline  rune = 'u'
	OpenLink      rune = 'O'
)

type workbook struct {
	name      string
	path      string
	sheets    []sheet
	sheet     int
	termRows  int
	termCols  int
}

func (w *workbook) PollForTermSize() {
	for {
		var cols, rows = termios.GetWindowSize()
		if rows != w.termRows || cols != w.termCols {
			w.termRows = rows
			w.termCols = cols
			fmt.Print("\033[2J")
			w.Draw()
		}

		time.Sleep(500 * time.Millisecond)
	}
}

func (w workbook) Draw() {
	fmt.Print("\033[0;0H")
	fmt.Printf("FILE: \033[1m%-*.*s\033[0m\n", w.termCols-6, w.termCols-6, w.path)
	fmt.Printf("EXPR: %-*.*s\n",
						 w.termCols-6, w.termCols-6,
						 w.sheets[w.sheet].CurrentValue(true))
	w.sheets[w.sheet].Draw(w.termCols,w.termRows)
}

func (w *workbook) Run() {
	defer termios.Restore()
	termios.SetCharMode()
	fmt.Print("\033[?25l\033[2J")

	go w.PollForTermSize()

	var input rune
	var chErr error
	for {
		w.Draw()
		input, chErr = Getch()
		if chErr != nil {
			continue
		}
		switch input {
		case Left, Right, Up, Down, ToTop, RowStart, ToBottom, RowEnd, qline.LeftArrow, qline.RightArrow, qline.DownArrow, qline.UpArrow, qline.Home, qline.End, qline.PageUp, qline.PageDown:
			w.sheets[w.sheet].moveSelection(input, w.termRows)
		case Quit:
			if modified {
				fmt.Print("There are unsaved changes. Quit anyway? [y/n]")
				answer, err := Getch()
				if err != nil || answer == 'n' || answer == 'N' {
					continue
				}
				fmt.Print("\n")
			}
			termios.Restore()
			fmt.Print("\033[?25h")
			os.Exit(0)
		case Edit, EditAlt, EditText:
			quote := false
			if input == EditText {
				quote = true
			}
			w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1].Edit(w.sheets[w.sheet].selection.row, w.sheets[w.sheet].selection.col, w.termCols, quote)
			w.sheets[w.sheet].Recalculate()
		case Del, qline.Delete, qline.BackSpace:
			w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1] = cell{}
			w.sheets[w.sheet].Recalculate()
		case Com:
			line := GetEditLine(":", "", w.termCols)
			runCommand(strings.Fields(line))
		case ZoomIn:
			w.sheets[w.sheet].ZoomIn()
			fmt.Print("\033[2J")
		case ZoomOut:
			w.sheets[w.sheet].ZoomOut()
			fmt.Print("\033[2J")
		case Yank:
			w.sheets[w.sheet].Yank()
		case Paste:
			w.sheets[w.sheet].Paste()
			w.sheets[w.sheet].Recalculate()
		case PasteRelative:
			w.sheets[w.sheet].PasteRelative()
			w.sheets[w.sheet].Recalculate()
		case ModBold:
			w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1].ToggleMod(Bold)
		case ModFaint:
			w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1].ToggleMod(Faint)
		case ModItalic:
			w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1].ToggleMod(Italic)
		case ModUnderline:
			w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1].ToggleMod(Underline)
		case OpenLink:
			url := w.sheets[w.sheet].cells[w.sheets[w.sheet].selection.row-1][w.sheets[w.sheet].selection.col-1].mask
			if IsURL(url) {
				OpenInBrowser(url)
			}
		}
	}
}

func makeWorkbook(path string) workbook {
	// TODO parse path and get file name
	// set name of strict to the filename
	// or untitled.qsh if no filename; set
	// path to the full path
	cols, rows := termios.GetWindowSize()
	sh := makeSheet("Sheet1")
	wb = workbook{filepath.Base(path), path, make([]sheet,1), 0, rows, cols}
	wb.sheets[0] = sh
	return wb
}

func (w workbook) header() string {
	return fmt.Sprintf("\033[1;7m %s \033[0m %s\n",w.name, w.sheets[w.sheet].name)
}