import subprocess
import json
import os
import time
import session_logger
from typing import Optional, Callable, Any

class GeminiCliAdapter:
 """
    Adapter for the Gemini CLI that parses streaming JSON output.
    """
 def __init__(self, binary_path: str = "gemini"):
  self.binary_path = binary_path
  self.session_id: Optional[str] = None
  self.last_usage: Optional[dict] = None
  self.last_latency: float = 0.0

 def send(self, message: str, safety_settings: list | None = None, system_instruction: str | None = None, 
          model: str | None = None, stream_callback: Optional[Callable[[str], None]] = None) -> dict[str, Any]:
  """
        Sends a message to the Gemini CLI and processes the streaming JSON output.
        Uses non-blocking line-by-line reading to allow stream_callback.
        """
  start_time = time.time()
  command_parts = [self.binary_path]
  if model:
   command_parts.extend(['-m', f'"{model}"'])
  command_parts.extend(['--prompt', '""'])
  if self.session_id:
   command_parts.extend(['--resume', self.session_id])
  command_parts.extend(['--output-format', 'stream-json'])
  command = " ".join(command_parts)

  prompt_text = message
  if system_instruction:
   prompt_text = f"{system_instruction}\n\n{message}"

  accumulated_text = ""
  tool_calls = []
  stdout_content = []
  stderr_content = []
  
  env = os.environ.copy()
  env["GEMINI_CLI_HOOK_CONTEXT"] = "manual_slop"
  
  process = subprocess.Popen(
   command,
   stdin=subprocess.PIPE,
   stdout=subprocess.PIPE,
   stderr=subprocess.PIPE,
   text=True,
   shell=True,
   env=env,
   bufsize=1 # Line buffered
  )

  # Use a thread or just communicate if we don't need real-time for stdin.
  # But we must read stdout line by line to avoid blocking the main thread 
  # if this were called from the main thread (though it's usually in a background thread).
  # The issue is that process.communicate blocks until the process exits.
  # We want to process JSON lines as they arrive.
  
  import threading
  def write_stdin():
   try:
    process.stdin.write(prompt_text)
    process.stdin.close()
   except: pass
  
  stdin_thread = threading.Thread(target=write_stdin, daemon=True)
  stdin_thread.start()

  # Read stdout line by line
  while True:
   line = process.stdout.readline()
   if not line and process.poll() is not None:
    break
   if not line:
    continue
   
   line = line.strip()
   stdout_content.append(line)
   try:
    data = json.loads(line)
    msg_type = data.get("type")
    if msg_type == "init":
     if "session_id" in data:
      self.session_id = data.get("session_id")
    elif msg_type == "message" or msg_type == "chunk":
     role = data.get("role", "")
     if role in ["assistant", "model"] or not role:
      content = data.get("content", data.get("text"))
      if content:
       accumulated_text += content
       if stream_callback:
        stream_callback(content)
    elif msg_type == "result":
     self.last_usage = data.get("stats") or data.get("usage")
     if "session_id" in data:
      self.session_id = data.get("session_id")
    elif msg_type == "tool_use":
     tc = {
      "name": data.get("tool_name", data.get("name")),
      "args": data.get("parameters", data.get("args", {})),
      "id": data.get("tool_id", data.get("id"))
     }
     if tc["name"]:
      tool_calls.append(tc)
   except json.JSONDecodeError:
    continue

  # Read remaining stderr
  stderr_final = process.stderr.read()
  
  process.wait()
  
  current_latency = time.time() - start_time
  session_logger.open_session()
  session_logger.log_cli_call(
   command=command,
   stdin_content=prompt_text,
   stdout_content="\n".join(stdout_content),
   stderr_content=stderr_final,
   latency=current_latency
  )
  self.last_latency = current_latency

  return {
   "text": accumulated_text,
   "tool_calls": tool_calls,
   "stderr": stderr_final
  }

 def count_tokens(self, contents: list[str]) -> int:
  """
        Provides a character-based token estimation for the Gemini CLI.
        Uses 4 chars/token as a conservative average.
        """
  total_chars = len("\n".join(contents))
  return total_chars // 4