import os
import sys

FILE_URI = "file://"

def locate_product_directory (jdt_ls_path):
    return os.path.join(jdt_ls_path, "org.eclipse.jdt.ls.product/target/repository")

def locate_launcher_jar (jdt_ls_path):
    jdt_ls_product_directory = locate_product_directory(jdt_ls_path)
    plugins_directory = os.path.join(jdt_ls_product_directory, "plugins")
    return os.path.join(plugins_directory, [jar for jar in os.listdir(plugins_directory) if jar.startswith("org.eclipse.equinox.launcher_")][0])

def locate_launcher_configuration (jdt_ls_path):
    return os.path.join(locate_product_directory(jdt_ls_path), "config_linux")

# TODO
def locate_lombok ():
    return "/home/malacoda/.m2/repository/org/projectlombok/lombok/1.18.16/lombok-1.18.16.jar"

class Java(LspServer):
    def __init__ (self, arguments):
        self.path = arguments[0]
        super().__init__([
            "java",
            f"-javaagent:{locate_lombok}",
            "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=1044",
            "-Declipse.application=org.eclipse.jdt.ls.core.id1",
            "-Dosgi.bundles.defaultStartLevel=4",
            "-Declipse.product=org.eclipse.jdt.ls.core.product",
            "-noverify",
            "-Xmx1G",
            "-jar", locate_launcher_jar(self.path),
            "-configuration", locate_launcher_configuration(self.path),
            "-data", os.path.join(self.path, "data"),
            "--add-modules=ALL-SYSTEM",
            "--add-opens", "java.base/java.util=ALL-UNNAMED",
            "--add-opens", "java.base/java.lang=ALL-UNNAMED"
        ] + arguments[1:])

    @command("java.apply.workspaceEdit")
    def workspaceEdit (self, arguments):
        print(f"we {arguments}")
        for argument in arguments:
            for file_name, changes in argument['changes'].items():
                file_name = file_name[len(FILE_URI):]
                file_contents = ""
                
                if os.path.exists(file_name):
                    with open(file_name) as in_file:
                        file_contents = in_file.read()
                
                for change in changes:
                    file_contents = perform_change(file_contents, change)
                    
                with open(file_name, "w") as out_file:
                    out_file.write(file_contents)
                    
def get_character_offset (file_contents, line, character):
    line_pos = 0
    while line > 0:
        line_pos = file_contents.index("\n", line_pos + 1)
        line = line - 1
    return line_pos + character
    
def perform_change (file_text, change):
    change_start = get_character_offset(file_text, change['range']['start']['character'], change['range']['start']['character'])
    change_end = get_character_offset(file_text, change['range']['end']['line'], change['range']['end']['character'])
    return file_text[:change_start] + change['newText'] + file_text[change_end:]