app.py

# app.py
import streamlit as st
import streamlit.components.v1 as components
import os
import json
import pandas as pd
import uuid
import math # For floor function
# from PIL import Image, ImageDraw # No longer needed for minimap
from streamlit_js_eval import streamlit_js_eval # For JS communication

# --- Constants ---
SAVE_DIR = "saved_worlds"
PLOT_WIDTH = 50.0 # Width of each plot in 3D space
PLOT_DEPTH = 50.0 # Depth of each plot (can be same as width)
CSV_COLUMNS = ['obj_id', 'type', 'pos_x', 'pos_y', 'pos_z', 'rot_x', 'rot_y', 'rot_z', 'rot_order']

# --- Ensure Save Directory Exists ---
os.makedirs(SAVE_DIR, exist_ok=True)

# --- Helper Functions ---

@st.cache_data(ttl=3600) # Cache plot list
def load_plot_metadata():
    """Scans save dir for plot_X*_Z*.csv, sorts, calculates metadata."""
    plots = []
    plot_files = []
    try:
        plot_files = [f for f in os.listdir(SAVE_DIR) if f.endswith(".csv") and f.startswith("plot_X")]
    except FileNotFoundError:
        st.error(f"Save directory '{SAVE_DIR}' not found.")
        return []
    except Exception as e:
        st.error(f"Error listing save directory '{SAVE_DIR}': {e}")
        return []

    # Parse filenames to get grid coordinates
    parsed_plots = []
    for filename in plot_files:
        try:
            parts = filename[:-4].split('_') # Remove .csv
            grid_x = int(parts[1][1:]) # Extract number after X
            grid_z = int(parts[2][1:]) # Extract number after Z
            # Extract name if present (parts after Z coordinate)
            plot_name = " ".join(parts[3:]) if len(parts) > 3 else f"Plot ({grid_x},{grid_z})"

            parsed_plots.append({
                'id': filename[:-4], # Use filename base as unique ID
                'filename': filename,
                'grid_x': grid_x,
                'grid_z': grid_z,
                'name': plot_name,
                'x_offset': grid_x * PLOT_WIDTH,
                'z_offset': grid_z * PLOT_DEPTH # Use PLOT_DEPTH for Z offset
            })
        except (IndexError, ValueError):
            st.warning(f"Could not parse grid coordinates from filename: {filename}. Skipping.")
            continue

    # Sort primarily by X, then by Z
    parsed_plots.sort(key=lambda p: (p['grid_x'], p['grid_z']))

    return parsed_plots

def load_plot_objects(filename, x_offset, z_offset):
    """Loads objects from a CSV, applying the plot's world offsets."""
    file_path = os.path.join(SAVE_DIR, filename)
    objects = []
    try:
        df = pd.read_csv(file_path)
        # Check required columns
        if not all(col in df.columns for col in ['type', 'pos_x', 'pos_y', 'pos_z']):
             st.warning(f"CSV '{filename}' missing essential columns. Skipping.")
             return []
        # Add defaults for optional columns
        df['obj_id'] = df.get('obj_id', pd.Series([str(uuid.uuid4()) for _ in range(len(df))]))
        for col, default in [('rot_x', 0.0), ('rot_y', 0.0), ('rot_z', 0.0), ('rot_order', 'XYZ')]:
             if col not in df.columns: df[col] = default

        for _, row in df.iterrows():
            obj_data = row.to_dict()
            # Apply world offset
            obj_data['pos_x'] += x_offset
            obj_data['pos_z'] += z_offset # Apply Z offset too
            objects.append(obj_data)
        return objects
    except FileNotFoundError:
        st.error(f"File not found during object load: {filename}")
        return []
    except pd.errors.EmptyDataError:
         return [] # Empty file is valid
    except Exception as e:
        st.error(f"Error loading objects from {filename}: {e}")
        return []

def save_plot_data(filename, objects_data_list, plot_x_offset, plot_z_offset):
    """Saves object data list to a CSV, making positions relative to plot origin."""
    file_path = os.path.join(SAVE_DIR, filename)
    relative_objects = []
    if not isinstance(objects_data_list, list):
        st.error("Invalid data format received for saving (expected a list).")
        return False

    for obj in objects_data_list:
        pos = obj.get('position', {})
        rot = obj.get('rotation', {})
        obj_type = obj.get('type', 'Unknown')
        obj_id = obj.get('obj_id', str(uuid.uuid4()))

        if not all(k in pos for k in ['x', 'y', 'z']) or obj_type == 'Unknown':
            print(f"Skipping malformed object during save prep: {obj}")
            continue

        relative_obj = {
            'obj_id': obj_id, 'type': obj_type,
            'pos_x': pos.get('x', 0.0) - plot_x_offset, # Make relative X
            'pos_y': pos.get('y', 0.0),
            'pos_z': pos.get('z', 0.0) - plot_z_offset, # Make relative Z
            'rot_x': rot.get('_x', 0.0), 'rot_y': rot.get('_y', 0.0), 'rot_z': rot.get('_z', 0.0),
            'rot_order': rot.get('_order', 'XYZ')
        }
        relative_objects.append(relative_obj)

    try:
        df = pd.DataFrame(relative_objects, columns=CSV_COLUMNS)
        df.to_csv(file_path, index=False)
        st.success(f"Saved {len(relative_objects)} objects to {filename}")
        return True
    except Exception as e:
        st.error(f"Failed to save plot data to {filename}: {e}")
        return False

# --- Page Config ---
st.set_page_config( page_title="Infinite World Builder", layout="wide")

# --- Initialize Session State ---
if 'selected_object' not in st.session_state: st.session_state.selected_object = 'None'
if 'new_plot_name' not in st.session_state: st.session_state.new_plot_name = "" # No longer used for filename
if 'js_save_data_result' not in st.session_state: st.session_state.js_save_data_result = None

# --- Load Plot Metadata ---
# This is now the source of truth for saved plots
plots_metadata = load_plot_metadata()

# --- Load ALL Objects for Rendering ---
all_initial_objects = []
for plot in plots_metadata:
    all_initial_objects.extend(load_plot_objects(plot['filename'], plot['x_offset'], plot['z_offset']))

# --- Sidebar ---
with st.sidebar:
    st.title("🏗️ World Controls")

    st.header("Navigation (Plots)")
    st.caption("Click to teleport player to a plot.")
    max_cols = 2 # Adjust columns for potentially more buttons
    cols = st.columns(max_cols)
    col_idx = 0
    # Sort buttons by grid coords for logical layout
    sorted_plots_for_nav = sorted(plots_metadata, key=lambda p: (p['grid_x'], p['grid_z']))
    for plot in sorted_plots_for_nav:
        button_label = f"➡️ {plot.get('name', plot['id'])} ({plot['grid_x']},{plot['grid_z']})"
        if cols[col_idx].button(button_label, key=f"nav_{plot['id']}"):
            target_x = plot['x_offset']
            target_z = plot['z_offset'] # Use Z offset too
            try:
                # Tell JS where to teleport (center of plot approx)
                js_code = f"teleportPlayer({target_x + PLOT_WIDTH/2}, {target_z + PLOT_DEPTH/2});"
                streamlit_js_eval(js_code=js_code, key=f"teleport_{plot['id']}")
            except Exception as e:
                 st.error(f"Failed to send teleport command: {e}")
        col_idx = (col_idx + 1) % max_cols

    st.markdown("---")

    # --- Object Placement ---
    st.header("Place Objects")
    object_types = ["None", "Simple House", "Tree", "Rock", "Fence Post"]
    current_object_index = object_types.index(st.session_state.selected_object) if st.session_state.selected_object in object_types else 0
    selected_object_type_widget = st.selectbox(
        "Select Object:", options=object_types, index=current_object_index, key="selected_object_widget"
    )
    if selected_object_type_widget != st.session_state.selected_object:
         st.session_state.selected_object = selected_object_type_widget
         # Rerun will happen, JS reloads state via sessionStorage, Python injects new selection

    st.markdown("---")

    # --- Saving ---
    st.header("Save Work")
    st.caption("Saves newly placed objects to the plot the player is currently in. If it's a new area, a new plot file is created.")
    if st.button("💾 Save Current Work", key="save_button"):
        # Trigger JS to get data AND player position
        js_get_data_code = "getSaveDataAndPosition();" # JS function needs update
        streamlit_js_eval(js_code=js_get_data_code, key="js_save_processor")
        st.rerun() # Rerun to process result


# --- Process Save Data ---
save_data_from_js = st.session_state.get("js_save_processor", None)

if save_data_from_js is not None:
    st.info("Received save data from client...")
    save_processed_successfully = False
    try:
        # Expecting { playerPosition: {x,y,z}, objectsToSave: [...] }
        payload = json.loads(save_data_from_js) if isinstance(save_data_from_js, str) else save_data_from_js

        if isinstance(payload, dict) and 'playerPosition' in payload and 'objectsToSave' in payload:
            player_pos = payload['playerPosition']
            objects_to_save = payload['objectsToSave']

            if isinstance(objects_to_save, list): # Allow saving empty list (clears new objects)
                # Determine target plot based on player position
                target_grid_x = math.floor(player_pos.get('x', 0.0) / PLOT_WIDTH)
                target_grid_z = math.floor(player_pos.get('z', 0.0) / PLOT_DEPTH) # Use Z pos too

                target_filename = f"plot_X{target_grid_x}_Z{target_grid_z}.csv"
                target_plot_x_offset = target_grid_x * PLOT_WIDTH
                target_plot_z_offset = target_grid_z * PLOT_DEPTH

                st.write(f"Attempting to save plot: {target_filename} (Player at: x={player_pos.get('x', 0):.1f}, z={player_pos.get('z', 0):.1f})")

                # Check if this plot already exists in metadata (for logging/future logic)
                is_new_plot_file = not os.path.exists(os.path.join(SAVE_DIR, target_filename))

                save_ok = save_plot_data(target_filename, objects_to_save, target_plot_x_offset, target_plot_z_offset)

                if save_ok:
                    load_plot_metadata.clear() # Clear cache to force reload metadata
                    try: # Tell JS to clear its unsaved state
                         streamlit_js_eval(js_code="resetNewlyPlacedObjects();", key="reset_js_state")
                    except Exception as js_e:
                         st.warning(f"Could not reset JS state after save: {js_e}")

                    if is_new_plot_file:
                        st.success(f"New plot created and saved: {target_filename}")
                    else:
                        st.success(f"Updated existing plot: {target_filename}")
                    save_processed_successfully = True
                else:
                    st.error(f"Failed to save plot data to file: {target_filename}")
            else:
                st.error("Invalid 'objectsToSave' format received (expected list).")
        else:
            st.error("Invalid save payload structure received from client.")
            print("Received payload:", payload) # Log for debugging

    except json.JSONDecodeError:
        st.error("Failed to decode save data from client.")
        print("Received raw data:", save_data_from_js)
    except Exception as e:
        st.error(f"Error processing save: {e}")
        st.exception(e)

    # Clear the trigger data from session state
    st.session_state.js_save_processor = None
    # Rerun after processing to reflect changes
    if save_processed_successfully:
        st.rerun()


# --- Main Area ---
st.header("Infinite Shared 3D World")
st.caption("Move to empty areas to expand the world. Use sidebar 'Save' to save work to current plot.")

# --- Load and Prepare HTML ---
html_file_path = 'index.html'
html_content_with_state = None

try:
    with open(html_file_path, 'r', encoding='utf-8') as f:
        html_template = f.read()

    # --- Inject Python state into JavaScript ---
    js_injection_script = f"""
<script>
    window.ALL_INITIAL_OBJECTS = {json.dumps(all_initial_objects)};
    window.PLOTS_METADATA = {json.dumps(plots_metadata)}; // Send plot info to JS
    window.SELECTED_OBJECT_TYPE = {json.dumps(st.session_state.selected_object)};
    window.PLOT_WIDTH = {json.dumps(PLOT_WIDTH)};
    window.PLOT_DEPTH = {json.dumps(PLOT_DEPTH)};
    console.log("Streamlit State Injected:", {{
        selectedObject: window.SELECTED_OBJECT_TYPE,
        initialObjectsCount: window.ALL_INITIAL_OBJECTS ? window.ALL_INITIAL_OBJECTS.length : 0,
        plotCount: window.PLOTS_METADATA ? window.PLOTS_METADATA.length : 0,
        plotWidth: window.PLOT_WIDTH,
        plotDepth: window.PLOT_DEPTH
    }});
</script>
"""
    html_content_with_state = html_template.replace('</head>', js_injection_script + '\n</head>', 1)

    # --- Embed HTML Component ---
    components.html(
        html_content_with_state,
        height=750,
        scrolling=False
    )

except FileNotFoundError:
    st.error(f"CRITICAL ERROR: Could not find the file '{html_file_path}'.")
    st.warning(f"Make sure `{html_file_path}` is in the same directory as `app.py` and `{SAVE_DIR}` exists.")
except Exception as e:
    st.error(f"An critical error occurred during HTML preparation or component rendering: {e}")
    st.exception(e)