package main

import (
	"fmt"
	"log"
	"strings"

	"github.com/jroimartin/gocui"
)

// BEGIN CONFIG SCREEN FUNCTIONS //
func DoConfig() {
	state.StatusMsg = "Galendar Configuration"
	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("", 'q', 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

		drawCalList(g, v)
		if _, err = g.SetCurrentView("default_calendars"); err != nil {
			return err
		}
	}
	if v, err := g.SetView("status_line", 0, height+1, width-1, height+3); err != nil {
		if err != gocui.ErrUnknownView {
			return err
		}
		drawStatusLine(g, v)
	}
	return nil
}

func updateConfigViews(g *gocui.Gui) error {
	for _, v := range g.Views() {
		v.Clear()
		switch v.Name() {
		case "default_calendars":
			if err := drawCalList(g, v); err != nil {
				return err
			}
		case "status_line":
			if err := drawStatusLine(g, v); err != nil {
				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()
	var removed bool
	calList := state.account.GetCalendarList()
	for i := range state.account.ActiveCalendars {
		if state.account.ActiveCalendars[i] == calList[cy].Id {
			// Remove calendar from defaults
			state.account.ActiveCalendars = append(state.account.ActiveCalendars[:i], state.account.ActiveCalendars[i+1:]...)
			state.StatusMsg = "Calendar '" + calList[cy].Summary + "' Removed from Defaults"
			removed = true
			break
		}
	}
	if !removed {
		// Add calendar to defaults
		state.StatusMsg = "Calendar '" + calList[cy].Summary + "' Added to Defaults"
		state.account.ActiveCalendars = append(state.account.ActiveCalendars, calList[cy].Id)
	}
	updateConfigViews(g)
	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()
		calList := state.account.GetCalendarList()
		if cy+1 > len(calList)-1 {
			return nil
		}
		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 drawStatusLine(g *gocui.Gui, v *gocui.View) error {
	fmt.Fprintln(v, state.StatusMsg)
	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.account.ActiveCalendars {
			if list[i].Id == state.account.ActiveCalendars[defIdx] {
				isDef = true
				break
			}
		}
		calSumTxt := "["
		if isDef {
			calSumTxt += "*"
		} else {
			calSumTxt += " "
		}
		calSumTxt += "] " + list[i].Summary + " " + list[i].BackgroundColor
		spc := strings.Repeat(" ", width-len(calSumTxt)-2)
		fmt.Fprintln(v, calSumTxt+spc)
	}
	return nil
}

// END CONFIG SCREEN FUNCTIONS //