from janito.agent.tool_base import ToolBase
from janito.agent.tools_utils.action_type import ActionType
from janito.agent.tool_registry import register_tool
from janito.i18n import tr
import subprocess
import os
import tempfile
import threading


@register_tool(name="run_powershell_command")
class RunPowerShellCommandTool(ToolBase):
    """
    Execute a non-interactive command using the PowerShell shell and capture live output.
    This tool explicitly invokes 'powershell.exe' (on Windows) or 'pwsh' (on other platforms if available).
    All commands are automatically prepended with UTF-8 output encoding:
    $OutputEncoding = [Console]::OutputEncoding = [System.Text.Encoding]::UTF8;
    For file output, it is recommended to use -Encoding utf8 in your PowerShell commands (e.g., Out-File -Encoding utf8) to ensure correct file encoding.
    Args:
        command (str): The PowerShell command to execute. This string is passed directly to PowerShell using the --Command argument (not as a script file).
        timeout (int, optional): Timeout in seconds for the command. Defaults to 60.
        require_confirmation (bool, optional): If True, require user confirmation before running. Defaults to False.
        requires_user_input (bool, optional): If True, warns that the command may require user input and might hang. Defaults to False. Non-interactive commands are preferred for automation and reliability.
    Returns:
        str: Output and status message, or file paths/line counts if output is large.
    """

    def _confirm_and_warn(self, command, require_confirmation, requires_user_input):
        if requires_user_input:
            self.report_warning(
                tr(
                    "\u26a0\ufe0f  Warning: This command might be interactive, require user input, and might hang."
                )
            )
        if require_confirmation:
            confirmed = self.ask_user_confirmation(
                tr(
                    "About to run PowerShell command: {command}\nContinue?",
                    command=command,
                )
            )
            if not confirmed:
                self.report_warning(tr("\u26a0\ufe0f Execution cancelled by user."))
                return False
        return True

    def _launch_process(self, shell_exe, command_with_encoding):
        env = os.environ.copy()
        env["PYTHONIOENCODING"] = "utf-8"
        return subprocess.Popen(
            [
                shell_exe,
                "-NoProfile",
                "-ExecutionPolicy",
                "Bypass",
                "-Command",
                command_with_encoding,
            ],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True,
            bufsize=1,
            universal_newlines=True,
            encoding="utf-8",
            env=env,
        )

    def _stream_output(self, stream, file_obj, report_func, count_func, counter):
        for line in stream:
            file_obj.write(line)
            file_obj.flush()
            report_func(line)
            if count_func == "stdout":
                counter["stdout"] += 1
            else:
                counter["stderr"] += 1

    def _format_result(
        self, requires_user_input, return_code, stdout_file, stderr_file, max_lines=100
    ):
        warning_msg = ""
        if requires_user_input:
            warning_msg = tr(
                "\u26a0\ufe0f  Warning: This command might be interactive, require user input, and might hang.\n"
            )
        with open(stdout_file.name, "r", encoding="utf-8", errors="replace") as out_f:
            stdout_content = out_f.read()
        with open(stderr_file.name, "r", encoding="utf-8", errors="replace") as err_f:
            stderr_content = err_f.read()
        stdout_lines = stdout_content.count("\n")
        stderr_lines = stderr_content.count("\n")
        if stdout_lines <= max_lines and stderr_lines <= max_lines:
            result = warning_msg + tr(
                "Return code: {return_code}\n--- STDOUT ---\n{stdout_content}",
                return_code=return_code,
                stdout_content=stdout_content,
            )
            if stderr_content.strip():
                result += tr(
                    "\n--- STDERR ---\n{stderr_content}",
                    stderr_content=stderr_content,
                )
            return result
        else:
            result = warning_msg + tr(
                "stdout_file: {stdout_file} (lines: {stdout_lines})\n",
                stdout_file=stdout_file.name,
                stdout_lines=stdout_lines,
            )
            if stderr_lines > 0 and stderr_content.strip():
                result += tr(
                    "stderr_file: {stderr_file} (lines: {stderr_lines})\n",
                    stderr_file=stderr_file.name,
                    stderr_lines=stderr_lines,
                )
            result += tr(
                "returncode: {return_code}\nUse the get_lines tool to inspect the contents of these files when needed.",
                return_code=return_code,
            )
            return result

    def run(
        self,
        command: str,
        timeout: int = 60,
        require_confirmation: bool = False,
        requires_user_input: bool = False,
    ) -> str:
        if not command.strip():
            self.report_warning(tr("\u2139\ufe0f Empty command provided."))
            return tr("Warning: Empty command provided. Operation skipped.")
        encoding_prefix = "$OutputEncoding = [Console]::OutputEncoding = [System.Text.Encoding]::UTF8; "
        command_with_encoding = encoding_prefix + command
        self.report_info(
            ActionType.EXECUTE,
            tr(
                "\U0001f5a5\ufe0f Running PowerShell command: {command} ...\n",
                command=command,
            ),
        )
        if not self._confirm_and_warn(
            command, require_confirmation, requires_user_input
        ):
            return tr("\u274c Command execution cancelled by user.")
        from janito.agent.platform_discovery import PlatformDiscovery

        pd = PlatformDiscovery()
        shell_exe = "powershell.exe" if pd.is_windows() else "pwsh"
        try:
            with (
                tempfile.NamedTemporaryFile(
                    mode="w+",
                    prefix="run_powershell_stdout_",
                    delete=False,
                    encoding="utf-8",
                ) as stdout_file,
                tempfile.NamedTemporaryFile(
                    mode="w+",
                    prefix="run_powershell_stderr_",
                    delete=False,
                    encoding="utf-8",
                ) as stderr_file,
            ):
                process = self._launch_process(shell_exe, command_with_encoding)
                counter = {"stdout": 0, "stderr": 0}
                stdout_thread = threading.Thread(
                    target=self._stream_output,
                    args=(
                        process.stdout,
                        stdout_file,
                        self.report_stdout,
                        "stdout",
                        counter,
                    ),
                )
                stderr_thread = threading.Thread(
                    target=self._stream_output,
                    args=(
                        process.stderr,
                        stderr_file,
                        self.report_stderr,
                        "stderr",
                        counter,
                    ),
                )
                stdout_thread.start()
                stderr_thread.start()
                try:
                    return_code = process.wait(timeout=timeout)
                except subprocess.TimeoutExpired:
                    process.kill()
                    self.report_error(
                        tr(
                            " \u274c Timed out after {timeout} seconds.",
                            timeout=timeout,
                        )
                    )
                    return tr(
                        "Command timed out after {timeout} seconds.", timeout=timeout
                    )
                stdout_thread.join()
                stderr_thread.join()
                stdout_file.flush()
                stderr_file.flush()
                self.report_success(
                    tr(" \u2705 return code {return_code}", return_code=return_code)
                )
                return self._format_result(
                    requires_user_input, return_code, stdout_file, stderr_file
                )
        except Exception as e:
            self.report_error(tr(" \u274c Error: {error}", error=e))
            return tr("Error running command: {error}", error=e)
