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import graphviz
import json
from tempfile import NamedTemporaryFile
import os
from graph_generator_utils import add_nodes_and_edges
def generate_radial_diagram(json_input: str, base_color: str) -> str: # base_color is now correctly used
"""
Generates a radial (center-expanded) diagram from JSON input.
Args:
json_input (str): A JSON string describing the radial diagram structure.
It must follow the Expected JSON Format Example below.
base_color (str): The hexadecimal color string (e.g., '#19191a') for the base
color of the nodes, from which a gradient will be generated.
Returns:
str: The filepath to the generated PNG image file.
Expected JSON Format Example:
{
"central_node": "Making Coffee",
"nodes": [
{
"id": "coffee_components",
"label": "Coffee Components",
"relationship": "Involves",
"subnodes": [
{
"id": "equipment",
"label": "Equipment Needed",
"relationship": "Requires",
"subnodes": [
{"id": "coffee_maker", "label": "Coffee Maker", "relationship": "e.g."},
{"id": "mug", "label": "Mug", "relationship": "For"}
]
}
]
},
{
"id": "coffee_process_enjoyment",
"label": "Process & Enjoyment",
"relationship": "Leads to",
"subnodes": [
{
"id": "preparation_steps",
"label": "Preparation Steps",
"relationship": "Involves",
"subnodes": [
{"id": "grind_beans", "label": "Grind Beans", "relationship": "Step 1 (if whole)"},
{"id": "heat_water", "label": "Heat Water", "relationship": "Step 2"}
]
}
]
}
]
}
"""
try:
if not json_input.strip():
return "Error: Empty input"
data = json.loads(json_input)
if 'central_node' not in data or 'nodes' not in data:
raise ValueError("Missing required fields: central_node or nodes")
dot = graphviz.Digraph(
name='RadialDiagram',
format='png',
engine='neato', # Use 'neato' or 'fdp' for radial/force-directed layout
graph_attr={
'overlap': 'false', # Prevent node overlap
'splines': 'true', # Smooth splines for edges
'bgcolor': 'white', # White background
'pad': '0.5', # Padding around the graph
'layout': 'neato' # Explicitly set layout engine for consistency
},
node_attr={
'fixedsize': 'false' # Allow nodes to resize based on content
}
)
# This line was REMOVED to ensure the passed base_color is used: base_color = '#19191a'
# Central node styling (rounded box, dark color)
dot.node(
'central',
data['central_node'],
shape='box', # Rectangular shape
style='filled,rounded', # Filled and rounded corners
fillcolor=base_color, # Darkest color
fontcolor='white', # White text for dark background
fontsize='16' # Larger font for central node
)
# Add child nodes and edges recursively starting from depth 1
# The add_nodes_and_edges function will handle styling consistent with other graphs
add_nodes_and_edges(dot, 'central', data.get('nodes', []), current_depth=1, base_color=base_color)
# Save to temporary file
with NamedTemporaryFile(delete=False, suffix='.png') as tmp:
dot.render(tmp.name, format='png', cleanup=True)
return tmp.name + '.png'
except json.JSONDecodeError:
return "Error: Invalid JSON format"
except Exception as e:
return f"Error: {str(e)}"
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