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import graphviz
import json
from tempfile import NamedTemporaryFile
import os
def generate_entity_relationship_diagram(json_input: str, output_format: str) -> str:
try:
if not json_input.strip():
return "Error: Empty input"
data = json.loads(json_input)
if 'entities' not in data:
raise ValueError("Missing required field: entities")
dot = graphviz.Graph(
name='ERDiagram',
format='png',
graph_attr={
'rankdir': 'TB',
'splines': 'ortho',
'bgcolor': 'white',
'pad': '0.5',
'nodesep': '2.0',
'ranksep': '2.5'
}
)
base_color = '#19191a'
lightening_factor = 0.15
entities = data.get('entities', [])
relationships = data.get('relationships', [])
for i, entity in enumerate(entities):
entity_name = entity.get('name')
entity_type = entity.get('type', 'strong')
attributes = entity.get('attributes', [])
if not entity_name:
raise ValueError(f"Invalid entity: {entity}")
current_depth = i % 6
if not isinstance(base_color, str) or not base_color.startswith('#') or len(base_color) != 7:
base_color_safe = '#19191a'
else:
base_color_safe = base_color
base_r = int(base_color_safe[1:3], 16)
base_g = int(base_color_safe[3:5], 16)
base_b = int(base_color_safe[5:7], 16)
current_r = base_r + int((255 - base_r) * current_depth * lightening_factor)
current_g = base_g + int((255 - base_g) * current_depth * lightening_factor)
current_b = base_b + int((255 - base_b) * current_depth * lightening_factor)
current_r = min(255, current_r)
current_g = min(255, current_g)
current_b = min(255, current_b)
node_color = f'#{current_r:02x}{current_g:02x}{current_b:02x}'
font_color = 'white' if current_depth * lightening_factor < 0.6 else 'black'
entity_label = f"{entity_name}\\n"
if attributes:
primary_keys = []
foreign_keys = []
regular_attrs = []
for attr in attributes:
attr_name = attr.get('name', '')
attr_type = attr.get('type', 'key')
is_multivalued = attr.get('multivalued', False)
is_derived = attr.get('derived', False)
is_composite = attr.get('composite', False)
if attr_type == 'primary_key':
if is_multivalued:
primary_keys.append(f"{{{{ {attr_name} }}}}")
else:
primary_keys.append(f"[PK] {attr_name}")
elif attr_type == 'foreign_key':
foreign_keys.append(f"[FK] {attr_name}")
else:
attr_display = attr_name
if is_derived:
attr_display = f"/ {attr_display} /"
if is_multivalued:
attr_display = f"{{ {attr_display} }}"
if is_composite:
attr_display = f"( {attr_display} )"
regular_attrs.append(attr_display)
if primary_keys:
entity_label += "\\n".join(primary_keys) + "\\n"
if foreign_keys:
entity_label += "\\n".join(foreign_keys) + "\\n"
if regular_attrs:
entity_label += "\\n".join(regular_attrs)
if entity_type == 'weak':
shape = 'doubleoctagon'
style = 'filled'
else:
shape = 'box'
style = 'filled,rounded'
dot.node(
entity_name,
entity_label,
shape=shape,
style=style,
fillcolor=node_color,
fontcolor=font_color,
fontsize='10',
fontname='Helvetica'
)
for relationship in relationships:
rel_name = relationship.get('name')
rel_type = relationship.get('type', 'regular')
entities_involved = relationship.get('entities', [])
cardinalities = relationship.get('cardinalities', {})
if not rel_name or len(entities_involved) < 2:
raise ValueError(f"Invalid relationship: {relationship}")
rel_node_color = '#e6f3ff'
if rel_type == 'identifying':
rel_shape = 'diamond'
rel_style = 'filled,bold'
rel_color = '#4a90e2'
elif rel_type == 'weak':
rel_shape = 'diamond'
rel_style = 'filled,dashed'
rel_color = '#a0a0a0'
else:
rel_shape = 'diamond'
rel_style = 'filled'
rel_color = '#4a90e2'
dot.node(
rel_name,
rel_name,
shape=rel_shape,
style=rel_style,
fillcolor=rel_color,
fontcolor='white',
fontsize='10',
fontname='Helvetica'
)
for entity in entities_involved:
cardinality = cardinalities.get(entity, '1')
edge_label = cardinality
if cardinality in ['1:1', '1:N', 'M:N', '1', 'N', 'M']:
pass
else:
edge_label = cardinality
dot.edge(
entity,
rel_name,
label=edge_label,
color='#4a4a4a',
fontsize='9',
fontcolor='#4a4a4a'
)
with NamedTemporaryFile(delete=False, suffix=f'.{output_format}') as tmp:
dot.render(tmp.name, format=output_format, cleanup=True)
return f"{tmp.name}.{output_format}"
except json.JSONDecodeError:
return "Error: Invalid JSON format"
except Exception as e:
return f"Error: {str(e)}" |