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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_concept_map(json_input: str, base_color: str) -> str:
"""
Generates a concept map from JSON input.
Args:
json_input (str): A JSON string describing the concept map 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": "Artificial Intelligence (AI)",
"nodes": [
{
"id": "ml_fundamental",
"label": "Machine Learning",
"relationship": "is essential for",
"subnodes": [
{
"id": "dl_branch",
"label": "Deep Learning",
"relationship": "for example",
"subnodes": [
{"id": "cnn_example", "label": "CNNs", "relationship": "for example"},
{"id": "rnn_example", "label": "RNNs", "relationship": "for example"}
]
}
]
},
{
"id": "ai_types",
"label": "Types",
"relationship": "formed by",
"subnodes": [
{
"id": "agi_type",
"label": "AGI",
"relationship": "this is",
"subnodes": [
{"id": "strong_ai", "label": "Strong AI", "relationship": "provoked by"}
]
}
]
}
]
}
"""
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='ConceptMap',
format='png',
graph_attr={
'rankdir': 'TB', # Top-to-Bottom layout (vertical hierarchy)
'splines': 'ortho', # Straight lines
'bgcolor': 'white', # White background
'pad': '0.5' # Padding around the graph
}
)
# Ensure base_color is valid, fallback if not
if not isinstance(base_color, str) or not base_color.startswith('#') or len(base_color) != 7:
base_color = '#19191a' # Fallback to default dark if invalid
# 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
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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