package ctfc

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

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

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

	fmt.Println(ui.NormalBox(true, "Login", "Register"))
	fmt.Print(ui.InputField("[L/R]"))
	command := strings.ToLower(ui.GetInput())

	if command == "l" {
		defer loginWindow()
	} else if command == "r" {
		defer registerWindow()
	} else {
		defer showError(invalidCommand, StartupWindow)
	}
}

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

	fmt.Println(ui.NormalBox(true, "Login"))

	switch len(values) {
	case 0:
		fmt.Print(ui.InputField("Username"))
	case 1:
		fmt.Println(ui.InputFieldFilled("Username", values[0]))
		fmt.Print(ui.InputField("Password"))
	}

	val := ui.GetInput()

	if len(values) == 0 {
		defer loginWindow(val)
	} else if logInUser(values[0], val) {
		defer chatsWindow()
	} else {
		defer showError(invalidCredentials, loginWindow, values...)
	}
}

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

	fmt.Println(ui.NormalBox(true, "Register"))

	var validationF func(string) bool
	var fieldName, specification string

	switch len(values) {
	case 0:
		validationF, fieldName, specification = stringValidUsername, "Username", "[A-z, 0-9, *, ., _, -; at least 1 letter]"
	case 1:
		fmt.Println(ui.InputFieldFilled("Username", values[0]))
		validationF, fieldName, specification = stringValidPassword, "Password", "[5-40 characters; at least 1 number]"
	case 2:
		fmt.Println(ui.InputFieldFilled("Username", values[0]))
		fmt.Println(ui.InputFieldFilled("Password", values[1]))
		validationF, fieldName, specification = stringValidName, "Name", "[2-60 characters]"
	}

	fmt.Print(ui.InputField(fieldName + " " + specification))
	val := ui.GetInput()

	if validationF(val) {
		values = append(values, val)

		// When user has entered all required values
		if len(values) == 3 {
			createUser(values)
			logInUser(values[0], values[1])
			defer chatsWindow()
		} else { // When there are still values to be given
			defer registerWindow(values...)
		}
	} else {
		defer showError(invalidValueFor(fieldName), registerWindow, values...)
	}
}

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

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

	if len(values) > 0 {
		if values[len(values)-1] == "ShowHelp" {
			fmt.Println(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]"))
		}
	}
	fmt.Print(ui.InputField("[D/A/L/</>/C/E/name/number/H]"))

	val := ui.GetInput()

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

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", chatsWindow, nil},
		)
	}
	for _, v := range ia {
		if input == v.value {
			defer v.execute(v.args...)
			return true
		}
	}
	return false
}

var clearNext = true

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

	fmt.Println(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")
	}
}