package main

import (
	"fmt"
	"log"
	"strings"
	"time"

	"github.com/jroimartin/gocui"
)

// BEGIN CONFIG SCREEN FUNCTIONS //
func DoConfig() {
	g, err := gocui.NewGui(gocui.Output256)
	if err != nil {
		log.Panicln(err)
	}
	defer g.Close()
	g.Cursor = true
	g.SetManagerFunc(configLayout)

	// Set up some keybindings
	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
		log.Panicln(err)
	}
	if err := g.SetKeybinding("default_calendars", gocui.KeyArrowUp, gocui.ModNone, cursorUp); err != nil {
		log.Panicln(err)
	}
	if err := g.SetKeybinding("default_calendars", 'k', gocui.ModNone, cursorUp); err != nil {
		log.Panicln(err)
	}
	if err := g.SetKeybinding("default_calendars", gocui.KeyArrowDown, gocui.ModNone, cursorDown); err != nil {
		log.Panicln(err)
	}
	if err := g.SetKeybinding("default_calendars", 'j', gocui.ModNone, cursorDown); err != nil {
		log.Panicln(err)
	}
	if err := g.SetKeybinding("default_calendars", gocui.KeySpace, gocui.ModNone, toggleCalendar); err != nil {
		log.Panicln(err)
	}
	if err := g.SetKeybinding("default_calendars", gocui.KeyEnter, gocui.ModNone, toggleCalendar); err != nil {
		log.Panicln(err)
	}

	// Kick off the main loop
	if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
		log.Panicln(err)
	}
}

func configLayout(g *gocui.Gui) error {
	list := state.account.GetCalendarList()
	height := len(list) + 4
	width, _ := g.Size()
	if v, err := g.SetView("default_calendars", 0, 0, width-1, height); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}

		v.Highlight = true
		v.SelBgColor = gocui.ColorGreen
		v.SelFgColor = gocui.ColorBlack

		v.Clear()
		drawCalList(g, v)
		_, err := g.SetCurrentView("default_calendars")
		return err
	}
	return nil
}

func quit(g *gocui.Gui, v *gocui.View) error {
	return gocui.ErrQuit
}

func toggleCalendar(g *gocui.Gui, v *gocui.View) error {
	_, cy := v.Cursor()
	calList := state.account.GetCalendarList()
	if v != nil {
		for i := range state.defaultCalendars {
			state.StatusMsg = time.Now().Format(time.RFC3339)
			if state.defaultCalendars[i] == calList[cy].Id {
				// Remove calendar from defaults
				state.defaultCalendars = append(state.defaultCalendars[:i], state.defaultCalendars[i+1:]...)
			}
		}
	}
	// Add calendar to defaults
	state.defaultCalendars = append(state.defaultCalendars, calList[cy].Id)
	return nil
}

func cursorUp(g *gocui.Gui, v *gocui.View) error {
	if v != nil {
		ox, oy := v.Origin()
		cx, cy := v.Cursor()
		if err := v.SetCursor(cx, cy-1); err != nil && oy > 0 {
			if err := v.SetOrigin(ox, oy-1); err != nil {
				return err
			}
		}
	}
	return nil
}

func cursorDown(g *gocui.Gui, v *gocui.View) error {
	if v != nil {
		cx, cy := v.Cursor()
		if err := v.SetCursor(cx, cy+1); err != nil {
			ox, oy := v.Origin()
			if err := v.SetOrigin(ox, oy+1); err != nil {
				return err
			}
		}
	}
	return nil
}

func drawCalList(g *gocui.Gui, v *gocui.View) error {
	width, _ := g.Size()
	list := state.account.GetCalendarList()
	for i := range list {
		isDef := false
		for defIdx := range state.defaultCalendars {
			if list[i].Id == state.defaultCalendars[defIdx] {
				isDef = true
				break
			}
		}
		calSumTxt := "["
		if isDef {
			calSumTxt += "*"
		} else {
			calSumTxt += " "
		}
		calSumTxt += "] " + list[i].Summary
		spc := strings.Repeat(" ", width-len(calSumTxt)-2)
		fmt.Fprintln(v, calSumTxt+spc)
	}
	fmt.Fprintln(v, "Status: "+time.Now().Format(time.RFC3339))
	return nil
}

// END CONFIG SCREEN FUNCTIONS //