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import sys
import os
import json
from PySide6.QtCore import QObject, Slot

# Ensure project source root is in path
PROJECT_SRC = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", ".."))
if PROJECT_SRC not in sys.path:
    sys.path.insert(0, PROJECT_SRC)

from frontend.threads.llm_thread import LLMThread
from frontend.threads.simulation_thread import SimulationThread
from llm_panda.conversation import ConversationManager
from llm_panda.plan_verifier import PlanVerifier

class UIController(QObject):
    """

    Main controller coordinates widgets and background threads (LLM Planning & PyBullet Simulation).

    """
    def __init__(self, main_window):
        super().__init__()
        self.main_window = main_window
        
        # References to widgets
        self.viewport_widget = None
        self.chat_widget = None
        self.log_widget = None
        self.status_widget = None
        self.score_modal = None
        
        # Threads
        self.sim_thread = None
        self.llm_thread = None
        self.last_scene_state = None
        self.conversation_manager = ConversationManager()

    def start(self):
        """Initializes and starts the simulation background thread."""
        self.viewport_widget = self.main_window.viewport_widget
        self.chat_widget = self.main_window.chat_widget
        self.log_widget = self.main_window.log_widget
        self.status_widget = self.main_window.status_widget
        self.score_modal = self.main_window.score_modal

        # Bind Viewport events to simulation camera actions
        self.viewport_widget.camera_rotated.connect(self.handle_camera_rotate)
        self.viewport_widget.camera_panned.connect(self.handle_camera_pan)
        self.viewport_widget.camera_zoomed.connect(self.handle_camera_zoom)
        self.viewport_widget.viewport_clicked.connect(self.handle_viewport_clicked)

        # Bind Chat events
        self.chat_widget.command_submitted.connect(self.handle_command_submit)
        self.chat_widget.preset_clicked.connect(self.handle_preset_click)
        self.chat_widget.reset_clicked.connect(self.handle_reset_click)
        self.chat_widget.gui_toggled.connect(self.handle_gui_toggle)

        # Create and run simulation thread
        self.sim_thread = SimulationThread()
        
        # Connect simulation thread signals
        self.sim_thread.frame_ready.connect(self.viewport_widget.update_frame)
        self.sim_thread.log_message.connect(self.log_widget.append_log)
        self.sim_thread.fps_updated.connect(self.status_widget.update_fps)
        self.sim_thread.step_completed.connect(self.handle_step_completed)
        self.sim_thread.finished.connect(self.handle_execution_finished)
        self.sim_thread.init_completed.connect(self.handle_sim_init_completed)
        
        self.sim_thread.start()

    def handle_sim_init_completed(self):
        self.status_widget.update_connection_badge(True)

    def handle_camera_rotate(self, dx, dy):
        if self.sim_thread:
            self.sim_thread.queue_command("camera_rotate", (dx, dy))

    def handle_camera_pan(self, dx, dy):
        if self.sim_thread:
            self.sim_thread.queue_command("camera_pan", (dx, dy))

    def handle_camera_zoom(self, delta):
        if self.sim_thread:
            self.sim_thread.queue_command("camera_zoom", delta)

    def handle_viewport_clicked(self, x, y):
        if self.sim_thread:
            w = self.viewport_widget.width()
            h = self.viewport_widget.height()
            self.sim_thread.queue_command("viewport_click", (x, y, w, h))

    def handle_preset_click(self, prompt_text):
        self.chat_widget.set_prompt_text(prompt_text)

    def handle_reset_click(self):
        if self.sim_thread:
            self.conversation_manager.clear()
            self.log_widget.clear_logs()
            self.chat_widget.clear_plan()
            self.status_widget.reset_steps()
            self.sim_thread.queue_command("reset")

    def handle_gui_toggle(self, checked):
        if self.sim_thread:
            self.sim_thread.queue_command("gui_toggle", checked)

    def handle_command_submit(self, prompt, use_mock):
        if not prompt:
            return
        
        self.log_widget.clear_logs()
        self.chat_widget.clear_plan()
        self.status_widget.reset_steps()
        
        self.log_widget.append_log(f"Gửi yêu cầu: \"{prompt}\"", "info")
        self.chat_widget.lock_inputs()
        
        # Capture current scene state thread-safely
        scene_state = {}
        with self.sim_thread.pybullet_lock:
            # Define reachability check for scene state
            def reachability_fn(oid):
                cls = self.sim_thread.sim.scene.get_class(oid)
                try:
                    grasp_pos, grasp_ori = self.sim_thread.sim.grasp_planner.compute_grasp_pose(oid, cls)
                    return self.sim_thread.sim.controller.is_reachable(grasp_pos, grasp_ori)
                except Exception:
                    return False

            carried_name = self.sim_thread.sim.scene.get_name(self.sim_thread.sim._carried) if self.sim_thread.sim._carried is not None else None
            scene_state = self.sim_thread.sim.scene.get_scene_state(reachability_fn=reachability_fn, carried_object=carried_name)
            
        self.last_scene_state = scene_state
        
        # Start LLM Planning Thread
        self.status_widget.set_step_active("llm")
        self.llm_thread = LLMThread(
            prompt,
            scene_state,
            use_mock,
            conversation_manager=self.conversation_manager,
        )
        self.llm_thread.plan_ready.connect(self.handle_plan_ready)
        self.llm_thread.log_message.connect(self.log_widget.append_log)
        self.llm_thread.failed.connect(self.handle_llm_failed)
        self.llm_thread.start()

    def handle_llm_failed(self, error_msg):
        self.status_widget.set_step_error("llm")
        self.chat_widget.unlock_inputs()

    def handle_plan_ready(self, plan_steps):
        self.status_widget.set_step_completed("llm")
        
        if not plan_steps:
            self.log_widget.append_log("⚠️ [1] Kế hoạch rỗng.", "warn")
            self.status_widget.set_step_active("score")
            # Calculate score immediately for empty plan
            self.sim_thread.queue_command("execute_plan", [])
            return

        first_step = plan_steps[0]
        if first_step.get("skill") in ("clarify", "reject"):
            message = first_step.get("args", {}).get(
                "message",
                "Yêu cầu cần được làm rõ.",
            )
            self.chat_widget.add_message(message, is_user=False)
            self.log_widget.append_log(f"Robot: {message}", "info")
            self.chat_widget.clear_plan()
            self.chat_widget.unlock_inputs()
            return

        self.chat_widget.display_plan(plan_steps)
            
        # Step 2: Validation
        self.status_widget.set_step_active("val")
        self.log_widget.append_log("⏳ [2/5] Đang kiểm tra kế hoạch (Validator)...", "info")
        
        try:
            warnings = PlanVerifier.check(plan_steps, self.last_scene_state)
            if not warnings:
                self.log_widget.append_log("✅ [2] Kế hoạch hợp lệ.", "success")
                self.status_widget.set_step_completed("val")
            else:
                self.log_widget.append_log(f"⚠️ [2] Validator phát hiện {len(warnings)} cảnh báo.", "warn")
                for w in warnings:
                    self.log_widget.append_log(f"   - {w}", "warn")
                self.status_widget.set_step_active("val")  # Set to warning/active state (orange dot visually)
        except Exception as e:
            self.log_widget.append_log(f"❌ [2] Lỗi kiểm tra kế hoạch: {e}", "error")
            self.status_widget.set_step_error("val")
            self.chat_widget.unlock_inputs()
            return
            
        # Step 3: Execution
        self.status_widget.set_step_active("exec")
        self.sim_thread.queue_command("execute_plan", plan_steps)

    def handle_step_completed(self, step_idx):
        self.chat_widget.mark_step_completed(step_idx)

    def handle_execution_finished(self, success, score_md, score_val):
        if success:
            self.status_widget.set_step_completed("exec")
        else:
            self.status_widget.set_step_error("exec")
            
        self.status_widget.set_step_completed("score")
        
        # Show rearrangement report modal
        self.score_modal.show_score(score_md)
        
        # Re-enable inputs
        self.chat_widget.unlock_inputs()

    def shutdown(self):
        """Safely stops background threads."""
        if self.llm_thread and self.llm_thread.isRunning():
            self.llm_thread.terminate()
            self.llm_thread.wait()
        if self.sim_thread:
            self.sim_thread.shutdown()