package input_parser

import (
	"bbash/environment"
	"os"
	"strings"
)

var commandsTab []string
var prevInput string
var tabIndex int
var skipCurrent bool

func AutoComplete(input string, env environment.Env) string {

	rawInput := input
	inputLength := len(input)

	if inputLength == 0 {
		return input
	}

	if prevInput == input {

		if skipCurrent {
			return input
		}

		tabIndex = tabIndex + 1

		if len(commandsTab) == 0 && tabIndex > 0 {
			return input
		}

		if tabIndex > len(commandsTab)-1 {
			tabIndex = 0
		}

		prevInput = commandsTab[tabIndex]
		return commandsTab[tabIndex]
	}

	prevInput = input
	tabIndex = 0

	var flagsDictionary []string

	baseCommands := []string{
		"cat",
		"cd",
		"cp",
		"echo",
		"exit",
		"fritiofcommand",
		"head",
		"help",
		"ls",
		"man",
		"mv",
		"pwd",
		"rm",
		"tail",
		"touch",
		"whereareyou",
	}

	var paths []string

	fs, err := os.ReadDir(env.Path)
	if err != nil {
		// fmt.Print(fmt.Sprintf("Error opening directory %s", env.Path))
	}
	for _, f := range fs {
		// if (f.Name()[0] == '.') && !(slices.Contains(in.Flags, "a")) {
		// 	continue
		// } // allows for hidden directories
		// fmt.Print(f.Name())
		// fmt.Println()
		paths = append(paths, f.Name())

	}

	skipCurrent = false
	acceptAll := false

	var autoCompleteCommands []string
	indexField0 := ""
	var currentIndexFields int
	var nextAutoCompleteCommands []string
	noMoreFlags := false

	for indexFields, currentField := range strings.Fields(input) {

		// print("noMoreFlags", noMoreFlags)

		currentIndexFields = indexFields

		if currentIndexFields == 0 {
			autoCompleteCommands = baseCommands
			indexField0 = currentField

			// println("len(strings.Fields(input))", len(strings.Fields(input)))
			// println("input[1:]k", input[len(input)-1:], "khej")
			if len(strings.Fields(input)) == 1 && input[len(input)-1:] == " " {
				currentIndexFields += 1
				// println("den hittade mellanslag :D")
				acceptAll = true

			}
		}

		if currentIndexFields > 0 {
			// autoCompleteCommands = baseFunctions
			// println("currentField 1 :D", currentField)

			switch indexField0 {
			case "fritiofcommand":
				skipCurrent = true
			case "pwd":
				skipCurrent = true
			case "echo":
				skipCurrent = true
			case "ls":
				autoCompleteCommands = paths
				flagsDictionary = []string{
					"-a", "-help",
				}
			case "cd":
				autoCompleteCommands = paths
			case "man":
				autoCompleteCommands = baseCommands
			case "cat":
				autoCompleteCommands = paths
			case "head":
				autoCompleteCommands = paths
				flagsDictionary = []string{
					"-n", "-help",
				}
			case "touch":
				autoCompleteCommands = paths
			case "rm":
				autoCompleteCommands = paths
			case "cp":
				autoCompleteCommands = paths
				nextAutoCompleteCommands = paths
			case "mv":
				autoCompleteCommands = paths
				nextAutoCompleteCommands = paths
			case "help":
				skipCurrent = true
			case "tail":
				autoCompleteCommands = paths
				flagsDictionary = []string{
					"-n", "-help",
				}
			case "whereareyou":
				skipCurrent = true
			default:
				skipCurrent = true

			}

			if skipCurrent {
				return rawInput
			}

			if currentIndexFields == 1 {
				// print("currentFieldhär om den har - :D", currentField)
				if strings.ContainsAny(currentField, "-") {
					noMoreFlags = true
				}
			}

			if len(strings.Fields(input)) == 2 && input[len(input)-1:] == " " {
				// currentIndexFields += 1
				// println("den hittade mellanslag 2 :D")
				acceptAll = true
				autoCompleteCommands = nil

				if noMoreFlags {
					skipCurrent = true
					return rawInput

				}

			}

		}

		if currentIndexFields > 2 {
			skipCurrent = true
			return rawInput
		}

		if currentIndexFields == 2 && noMoreFlags {
			skipCurrent = true
			return rawInput
		}

		if len(strings.Fields(input)) == 2 && input[len(input)-1:] == "-" {
			autoCompleteCommands = flagsDictionary

		}

		if currentIndexFields > 0 && len(autoCompleteCommands) == 0 || currentIndexFields > 0 && strings.ContainsAny(rawInput, "-") {
			// println("currentIdexFields är 2!!")

			// if len(flagsDictionary) == 0 {
			// 	skipCurrent = true
			// 	return rawInput
			// }

			// } else {
			// 	println("input", input, "test", input[len(input)-1:], "slut")
			// 	if input[len(input)-1:] == " " {
			// 		println("acceptAll")
			// 		acceptAll = true
			// 	}
			// }
			// println("currentField 2 :D", currentField)
			autoCompleteCommands = nextAutoCompleteCommands
			// println("nextAutoCompleteCommands", nextAutoCompleteCommands)
			// println("autoCompleteCommands", autoCompleteCommands)
			if len(nextAutoCompleteCommands) == 0 {
				// println("currentField 100 :D", currentField)
				// if strings.ContainsAny(rawInput, "-") {
				autoCompleteCommands = flagsDictionary
				// print("autoCompleteCommands", autoCompleteCommands)

				// if currentIndexFields == 1 {
				// 	noMoreFlags = true
				// }
				// } else {
				// if len(autoCompleteCommands) == 0 {
				// skipCurrent = true
				// return rawInput
				// }
				// break
			}

		}

		if currentIndexFields > 0 {
			input = currentField
		}

		// println("loop", indexFields)

		// if strings.ContainsAny(currentField, "-") {

		// }
	}

	// println("autoCompleteCOmmands", autoCompleteCommands)
	// println("autoCompleteCOmmands", autoCompleteCommands[0])

	if autoCompleteCommands == nil {
		skipCurrent = true
		return rawInput

	}

	var commandsWorking []string

	// println(commandsWorking)

	inputLength = len(input)

	aLength := 0

	foundAutoComplete := false

	for _, currentCommand := range autoCompleteCommands {
		// println("currentCommand")
		// println(currentCommand)

		if len(currentCommand) < inputLength && !acceptAll {
			continue
		}

		if !acceptAll {
			currentCommandWithoutEnd := currentCommand[:inputLength]
			if currentCommandWithoutEnd != input {
				continue
			}
		}

		foundAutoComplete = true

		aLength = len(currentCommand) - len(input)
		aLength = len(currentCommand) - aLength

		// println("aLength")
		// println(aLength)

		// println("currentCommand")
		// println(currentCommand)

		// println("rawInput")
		// println(rawInput)

		if acceptAll {
			commandsWorking = append(commandsWorking, rawInput+currentCommand)
		} else {
			commandsWorking = append(commandsWorking, rawInput+currentCommand[aLength:])
		}

	}

	if !foundAutoComplete {
		skipCurrent = true
		return rawInput
	}

	// println("commandsWorking")
	// println(commandsWorking[0])
	// println(commandsWorking[1])

	commandsTab = commandsWorking

	if len(commandsTab) == 0 {
		return input
	}

	removedStart := commandsTab[0]
	// removedStart := commandsTab[0][inputLength:]

	prevInput = removedStart
	return prevInput
}