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package lsp

import (
	"net/url"
	"path/filepath"
	"strings"
)

// PathToURI turns a file path into the file:// URI the protocol names
// documents by.
//
// The path is made absolute first, since a language server has no idea what
// the editor's working directory is.
//
//	lsp.PathToURI("main.go") // file:///home/you/project/main.go
func PathToURI(path string) string {
	absolute, err := filepath.Abs(path)
	if err != nil {
		absolute = path
	}
	absolute = filepath.ToSlash(absolute)

	if !strings.HasPrefix(absolute, "/") {
		// A Windows path such as C:/x becomes /C:/x, which is what the URI
		// form of a drive letter looks like.
		absolute = "/" + absolute
	}

	uri := url.URL{Scheme: "file", Path: absolute}
	return uri.String()
}

// URIToPath turns a file:// URI back into a path. Anything that is not a file
// URI comes back unchanged, since there is nothing better to do with it.
func URIToPath(uri string) string {
	parsed, err := url.Parse(uri)
	if err != nil || parsed.Scheme != "file" {
		return uri
	}

	path := parsed.Path
	// Undo the leading slash added in front of a Windows drive letter.
	if len(path) > 2 && path[0] == '/' && path[2] == ':' {
		path = path[1:]
	}
	return filepath.FromSlash(path)
}