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package ctfc

import (
	"fmt"
	"os"
	"os/exec"
	"runtime"
	"strings"

	"gitlab.com/Syndamia/ctfc/go-src/ui"
)

func StartupWindow(...string) {
	clearScreen()

	ui.NormalBox(true, "Login", "Register")
	input := ui.InputField("[L/R]")

	handled := handleInputActions(input, false,
		inputAction{"L", loginWindow, nil},
		inputAction{"R", registerWindow, nil},
	)
	if !handled {
		defer showError(invalidCommand, StartupWindow)
	}
}

func loginWindow(values ...string) {
	inputs := formWindow("Login", []formInput{
		{"Username", "", nil},
		{"Password", "", nil},
	}, values...,
	)

	if logInUser(inputs[0], inputs[1]) {
		defer chatsWindow()
	} else {
		defer showError(invalidCredentials, loginWindow, inputs[0])
	}
}

func registerWindow(values ...string) {
	inputs := formWindow("Register", []formInput{
		{"Username", " [A-z, 0-9, *, ., _, -; at least 1 letter]", stringValidUsername},
		{"Password", " [5-40 characters; at least 1 number]", stringValidPassword},
		{"Name", " [2-60 characters]", stringValidName},
	}, values...,
	)

	createUser(inputs)
	logInUser(inputs[0], inputs[1])
	defer chatsWindow()
}

func chatsWindow(values ...string) {
	clearScreen()

	ui.NormalBox(true, "Direct Messages", "Account", "Logout")
	ui.PageField(0, 0)
	ui.EmptyLine()

	if len(values) > 0 {
		if values[0] == "ShowHelp" {
			ui.TextField("Chats page options: [(D)irect messages/(A)ccount/(L)ogout/(<) for previous page/(>) for next page/(C) for create chat/(name) for go to chat room by name/(number) for go to chat room by number/(H)elp]")
		}
	}
	input := ui.InputField("[D/A/L/</>/C/E/name/number/H]")

	handled := handleInputActions(input, true,
		inputAction{"H", chatsWindow, []string{"ShowHelp"}},
	)
	if !handled {
		defer showError(invalidCommand, chatsWindow)
	}
}

func logoutWindow(...string) {
	clearScreen()

	ui.NormalBox(true, "Are you sure you want to Log out of "+loggedInUser.Username+"?")
	ui.EmptyLine()

	input := ui.InputField("[Y/N]")

	if strings.ToLower(input) == "y" {
		logoutUser()
		defer StartupWindow()
	} else {
		defer chatsWindow()
	}
}

/* Form */

type formInput struct {
	name           string
	specification  string
	validationFunc func(string) bool
}

func formWindow(boxTitle string, formInputs []formInput, currentValues ...string) (userInputs []string) {
	userInputs = currentValues
	for _, v := range formInputs[len(currentValues):] {
		clearScreen()

		ui.NormalBox(true, boxTitle)

		for j, va := range userInputs {
			ui.InputFieldFilled(formInputs[j].name, va)
		}

		input := ui.InputField(v.name + v.specification)

		if v.validationFunc != nil {
			if !v.validationFunc(input) {
				formCallback := func(...string) {
					defer formWindow(boxTitle, formInputs, userInputs...)
				}
				defer showError(invalidValueFor(v.name), formCallback)
				return
			}
		}

		userInputs = append(userInputs, input)
	}
	return
}

/* Input actions */

type inputAction struct {
	value   string
	execute func(...string)
	args    []string
}

func handleInputActions(input string, handleNav bool, ia ...inputAction) bool {
	if handleNav {
		ia = append(ia,
			inputAction{"C", chatsWindow, nil},
			inputAction{"D", chatsWindow, nil},
			inputAction{"A", chatsWindow, nil},
			inputAction{"L", logoutWindow, nil},
		)
	}
	for _, v := range ia {
		if strings.ToLower(input) == strings.ToLower(v.value) {
			defer v.execute(v.args...)
			return true
		}
	}
	return false
}

/* Errors and Clear */

var clearNext = true

func showError(message string, callback func(...string), callbackData ...string) {
	clearScreen()

	ui.ErrorBox(message)
	clearNext = false

	defer callback(callbackData...)
}

func clearScreen() {
	if !clearNext {
		clearNext = true
		return
	}

	if runtime.GOOS == "windows" {
		cmd := exec.Command("cmd", "/c", "cls")
		cmd.Stdout = os.Stdout
		cmd.Run()
	} else {
		fmt.Println("\033[2J")
	}
}