import graphviz import json from tempfile import NamedTemporaryFile import os from graph_generator_utils import add_nodes_and_edges def generate_wbs_diagram(json_input: str, output_format: str) -> str: """ Generates a Work Breakdown Structure (WBS) Diagram from JSON input. Args: json_input (str): A JSON string describing the WBS structure. It must follow the Expected JSON Format Example below. output_format (str): The output format for the generated diagram. Supported formats: "png" or "svg" Expected JSON Format Example: { "project_title": "AI Model Development Project", "phases": [ { "id": "phase_prep", "label": "Preparation", "tasks": [ { "id": "task_1_1_vision", "label": "Identify Vision", "subtasks": [ { "id": "subtask_1_1_1_design_staff", "label": "Design & Staffing", "sub_subtasks": [ { "id": "ss_task_1_1_1_1_env_setup", "label": "Environment Setup", "sub_sub_subtasks": [ { "id": "sss_task_1_1_1_1_1_lib_install", "label": "Install Libraries", "final_level_tasks": [ {"id": "ft_1_1_1_1_1_1_data_access", "label": "Grant Data Access"} ] } ] } ] } ] } ] }, { "id": "phase_plan", "label": "Planning", "tasks": [ { "id": "task_2_1_cost_analysis", "label": "Cost Analysis", "subtasks": [ { "id": "subtask_2_1_1_benefit_analysis", "label": "Benefit Analysis", "sub_subtasks": [ { "id": "ss_task_2_1_1_1_risk_assess", "label": "AI Risk Assessment", "sub_sub_subtasks": [ { "id": "sss_task_2_1_1_1_1_model_selection", "label": "Model Selection", "final_level_tasks": [ {"id": "ft_2_1_1_1_1_1_data_strategy", "label": "Data Strategy"} ] } ] } ] } ] } ] }, { "id": "phase_dev", "label": "Development", "tasks": [ { "id": "task_3_1_change_mgmt", "label": "Data Preprocessing", "subtasks": [ { "id": "subtask_3_1_1_implementation", "label": "Feature Engineering", "sub_subtasks": [ { "id": "ss_task_3_1_1_1_beta_testing", "label": "Model Training", "sub_sub_subtasks": [ { "id": "sss_task_3_1_1_1_1_other_task", "label": "Model Evaluation", "final_level_tasks": [ {"id": "ft_3_1_1_1_1_1_hyperparam_tune", "label": "Hyperparameter Tuning"} ] } ] } ] } ] } ] } ] } Returns: str: The filepath to the generated image file. """ try: if not json_input.strip(): return "Error: Empty input" data = json.loads(json_input) if 'project_title' not in data or 'phases' not in data: raise ValueError("Missing required fields: project_title or phases") dot = graphviz.Digraph( name='WBSDiagram', format='png', graph_attr={ 'rankdir': 'TB', 'splines': 'ortho', 'bgcolor': 'white', 'pad': '0.5', 'ranksep': '0.6', 'nodesep': '0.5' } ) base_color = '#BEBEBE' dot.node( 'project_root', data['project_title'], shape='box', style='filled,rounded', fillcolor=base_color, fontcolor='black', fontsize='18' ) def get_gradient_color(depth, base_hex_color, lightening_factor=0.06): if not isinstance(base_hex_color, str) or not base_hex_color.startswith('#') or len(base_hex_color) != 7: base_hex_color = '#BEBEBE' base_r = int(base_hex_color[1:3], 16) base_g = int(base_hex_color[3:5], 16) base_b = int(base_hex_color[5:7], 16) current_r = base_r + int((255 - base_r) * depth * lightening_factor) current_g = base_g + int((255 - base_g) * depth * lightening_factor) current_b = base_b + int((255 - base_b) * depth * lightening_factor) return f'#{min(255, current_r):02x}{min(255, current_g):02x}{min(255, current_b):02x}' def get_font_color_for_background(depth, base_hex_color, lightening_factor=0.06): return 'black' def _add_wbs_nodes_recursive(parent_id, current_level_tasks, current_depth): for task_data in current_level_tasks: task_id = task_data.get('id') task_label = task_data.get('label') if not all([task_id, task_label]): raise ValueError(f"Invalid task data at depth {current_depth}: {task_data}") node_fill_color = get_gradient_color(current_depth, base_color) node_font_color = get_font_color_for_background(current_depth, base_color) font_size = max(9, 14 - (current_depth * 2)) dot.node( task_id, task_label, shape='box', style='filled,rounded', fillcolor=node_fill_color, fontcolor=node_font_color, fontsize=str(font_size) ) dot.edge(parent_id, task_id, color='#4a4a4a', arrowhead='none') next_level_keys = ['tasks', 'subtasks', 'sub_subtasks', 'sub_sub_subtasks', 'final_level_tasks'] for key_idx, key in enumerate(next_level_keys): if key in task_data and isinstance(task_data[key], list): _add_wbs_nodes_recursive(task_id, task_data[key], current_depth + 1) break phase_depth = 1 for phase in data['phases']: phase_id = phase.get('id') phase_label = phase.get('label') if not all([phase_id, phase_label]): raise ValueError(f"Invalid phase data: {phase}") phase_fill_color = get_gradient_color(phase_depth, base_color) phase_font_color = get_font_color_for_background(phase_depth, base_color) font_size_phase = max(9, 14 - (phase_depth * 2)) dot.node( phase_id, phase_label, shape='box', style='filled,rounded', fillcolor=phase_fill_color, fontcolor=phase_font_color, fontsize=str(font_size_phase) ) dot.edge('project_root', phase_id, color='#4a4a4a', arrowhead='none') if 'tasks' in phase and isinstance(phase['tasks'], list): _add_wbs_nodes_recursive(phase_id, phase['tasks'], phase_depth + 1) 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)}"