package common

import (
	"os"
	"strings"
)

func GetLine(path string, line int) (string, error) {
	path = path[len("file://"):]
	readBytes, err := os.ReadFile(path)

	if err != nil {
		return "", err
	}

	// Split file into lines
	lines := strings.Split(string(readBytes), "\n")

	return lines[line], nil
}

func Map[T any, O any](values []T, f func(T) O) []O {
	result := make([]O, len(values))

	for index, value := range values {
		result[index] = f(value)
	}

	return result
}

func SliceToSet[T comparable](values []T) map[T]struct{} {
	set := make(map[T]struct{})

	for _, value := range values {
		set[value] = struct{}{}
	}

	return set
}

func SliceToMap[T comparable, O any](values []T, defaultValue O) map[T]O {
	set := make(map[T]O)

	for _, value := range values {
		set[value] = defaultValue
	}

	return set
}

func FilterWhere[T any](values []T, f func(T) bool) []T {
	result := make([]T, 0)

	for _, value := range values {
		if f(value) {
			result = append(result, value)
		}
	}

	return result
}

func FilterMapWhere[T comparable, O any](values map[T]O, f func(T, O) bool) map[T]O {
	result := make(map[T]O)

	for key, value := range values {
		if f(key, value) {
			result[key] = value
		}
	}

	return result
}

func KeysOfMap[T comparable, O any](values map[T]O) []T {
	keys := make([]T, 0)

	for key := range values {
		keys = append(keys, key)
	}

	return keys
}

func DoesPathExist(path string) bool {
	_, err := os.Stat(path)

	return err == nil
}

func IsPathDirectory(path string) bool {
	info, err := os.Stat(path)

	return err == nil && info.IsDir()
}

func IsPathFile(path string) bool {
	info, err := os.Stat(path)

	return err == nil && !info.IsDir()
}

func OffsetLineAtLeft(offset uint32, line string, cursor uint32) (string, uint32) {
	if offset >= uint32(len(line)) {
		return line, cursor
	}

	return line[offset:], cursor - offset
}

func FindPreviousCharacter(line string, character string) (uint32, bool) {
	for index := len(line) - 1; index >= 0; index-- {
		if string(line[index]) == character {
			return uint32(index), true
		}
	}

	return 0, false
}