"""Read Python syntax only; Rust owns selection, scheduling and execution.

Protocol is tab-separated UTF-8. Never import repository modules. Dynamic file
and subprocess dependencies must be declared in checks.tsv.
"""
import ast
from pathlib import Path
import sys


def scan(root, extra=()):
    files = sorted((root / 'scripts').glob('*.py'))
    modules = {p.stem: 'scripts/' + p.name for p in files}
    for p in extra:
        if p.startswith('scripts/') and p.endswith('.py'):
            modules[Path(p).stem] = p
    rows = set()
    for path in files:
        name = 'scripts/' + path.name
        rows.add(('node', name))
        tree = ast.parse(path.read_text(), filename=name)
        outputs = set()
        for node in ast.walk(tree):
            if isinstance(node, ast.Import):
                imports = [a.name.split('.')[0] for a in node.names]
            elif isinstance(node, ast.ImportFrom):
                imports = [(node.module or '').split('.')[0]]
            else:
                imports = []
            for module in imports:
                if module in modules:
                    rows.add(('edge', modules[module], name))
            if isinstance(node, ast.Call) and isinstance(node.func, ast.Name) and node.func.id in ('write_json', 'write_rows', 'write_gzip') and node.args:
                dest = node.args[0]
                if isinstance(dest, ast.Call) and isinstance(dest.func, ast.Name) and dest.func.id == 'Path' and dest.args and isinstance(dest.args[0], ast.Constant) and isinstance(dest.args[0].value, str):
                    outputs.add(dest.args[0].value)
                    rows.add(('output', name, dest.args[0].value))
                else:
                    rows.add(('dynamic', name))
            if isinstance(node, ast.Call) and ((isinstance(node.func, ast.Name) and node.func.id == '__import__') or (isinstance(node.func, ast.Attribute) and node.func.attr == 'import_module')):
                rows.add(('unsafe', name))
        for node in ast.walk(tree):
            if isinstance(node, ast.Constant) and isinstance(node.value, str):
                value = node.value
                if value.startswith(('docs/', 'assets/', '.cache/')) and '\n' not in value and '\t' not in value and value not in outputs:
                    # Direct file literals only. Prefixes/formatted paths belong in the registry.
                    if Path(value).suffix:
                        rows.add(('edge', value, name))
    return sorted(rows)


if __name__ == '__main__':
    for row in scan(Path.cwd(), sys.argv[1:]):
        print('\t'.join(row))