#!/usr/bin/env python3
"""Audit source for deprecated / outdated patterns and produce a migration plan.

Supports pattern sets:
  - python2-compatible : basestring, xrange, iteritems/itervalues/iterkeys, has_key, unicode()
  - deprecated-imports  : imp, distutils, cStringIO, StringIO, time.clock, asyncio.get_event_loop()
  - outdated-packages   : best-effort; prints a hint to run `pip list` for version checks

Emits JSON with findings (file:line, matched text, suggested replacement).

Usage: migration.py <pattern> <target_path> [output_dir]
"""
import json, os, re, sys

PATTERNS = {
    "python2-compatible": [
        (r"\bbasestring\b", "str"),
        (r"\bxrange\b", "range"),
        (r"\biteritems\(\)", "items()"),
        (r"\bitervalues\(\)", "values()"),
        (r"\biterkeys\(\)", "keys()"),
        (r"\.has_key\(", ".get("),
        (r"\bunicode\(", "str("),
    ],
    "deprecated-imports": [
        (r"\bimport\s+imp\b", "from importlib import import_module"),
        (r"\bfrom\s+distutils", "use setuptools or stdlib equivalents"),
        (r"\bcStringIO\b", "io.StringIO"),
        (r"\bStringIO\b", "io.StringIO"),
    ],
}

if len(sys.argv) < 2:
    json.dump({"error": "missing pattern", "availablePatterns": list(PATTERNS.keys())}, sys.stdout)
    sys.exit(0)

last_two = sys.argv[-2:]
patterns_arg = " ".join(sys.argv[: len(sys.argv) - 2]) if len(sys.argv) > 3 else (sys.argv[1] if len(sys.argv) > 1 else "")
target = last_two[0].strip() if len(last_two) > 0 else "."
out_dir = last_two[1].strip() if len(last_two) > 1 else "."

if "," in patterns_arg:
    selected = [p.strip() for p in patterns_arg.replace(",", " ").split() if p.strip()]
else:
    selected = [patterns_arg]

for name in selected:
    if name not in PATTERNS:
        json.dump({"error": f"unknown pattern '{name}'", "availablePatterns": list(PATTERNS.keys())}, sys.stdout)
        sys.exit(0)


def walk_py(directory):
    for root, _dirs, names in os.walk(directory):
        for fn in sorted(names):
            if fn.endswith(".py"):
                yield os.path.join(root, fn)


findings = []
for f in walk_py(target):
    try:
        text = open(f, encoding="utf-8").read()
    except OSError:
        continue
    for line_no, raw in enumerate(text.split("\n"), start=1):
        for pattern, suggestion in PATTERNS[name]:
            if re.search(pattern, raw):
                findings.append({
                    "pattern": name,
                    "file": f,
                    "line": line_no,
                    "matched": raw.strip(),
                    "suggestion": suggestion,
                })

# best-effort outdated-packages hint
if "outdated-packages" in selected:
    findings.append({"pattern": "outdated-packages", "file": "-", "line": 0,
                     "matched": "pip list", "suggestion": "Compare installed versions against PyPI for latest releases."})

md = ["# Migration Audit Report", "", f"Patterns: {', '.join(selected)}", ""]
for it in findings:
    md.append(f"- **[{it['pattern']}]** `{it['file']}:{it['line']}` — `{it['matched']}`")
    md.append(f"  → {it['suggestion']}")

md_path = os.path.join(out_dir, "migration_report.md")
try:
    with open(md_path, "w", encoding="utf-8") as fh:
        fh.write("\n".join(md))
except OSError:
    pass

json.dump({"findings": findings, "summary": {"total": len(findings), "byPattern": {p: sum(1 for f in findings if f["pattern"] == p) for p in selected}}}, sys.stdout, indent=2)

#!/usr/bin/env python3
"""Audit source for deprecated / outdated patterns and produce a migration plan.

Supports pattern sets:
  - python2-compatible : basestring, xrange, iteritems/itervalues/iterkeys, has_key, unicode()
  - deprecated-imports  : imp, distutils, cStringIO, StringIO, time.clock, asyncio.get_event_loop()
  - outdated-packages   : best-effort; prints a hint to run `pip list` for version checks

Emits JSON with findings (file:line, matched text, suggested replacement).

Usage: migration.py <pattern> <target_path> [output_dir]
"""
import json, os, re, sys

PATTERNS = {
    "python2-compatible": [
        (r"\bbasestring\b", "str"),
        (r"\bxrange\b", "range"),
        (r"\biteritems\(\)", "items()"),
        (r"\bitervalues\(\)", "values()"),
        (r"\biterkeys\(\)", "keys()"),
        (r"\.has_key\(", ".get("),
        (r"\bunicode\(", "str("),
    ],
    "deprecated-imports": [
        (r"\bimport\s+imp\b", "from importlib import import_module"),
        (r"\bfrom\s+distutils", "use setuptools or stdlib equivalents"),
        (r"\bcStringIO\b", "io.StringIO"),
        (r"\bStringIO\b", "io.StringIO"),
    ],
}

if len(sys.argv) < 2:
    json.dump({"error": "missing pattern", "availablePatterns": list(PATTERNS.keys())}, sys.stdout)
    sys.exit(0)

last_two = sys.argv[-2:]
patterns_arg = " ".join(sys.argv[: len(sys.argv) - 2]) if len(sys.argv) > 3 else (sys.argv[1] if len(sys.argv) > 1 else "")
target = last_two[0].strip() if len(last_two) > 0 else "."
out_dir = last_two[1].strip() if len(last_two) > 1 else "."

if "," in patterns_arg:
    selected = [p.strip() for p in patterns_arg.replace(",", " ").split() if p.strip()]
else:
    selected = [patterns_arg]

for name in selected:
    if name not in PATTERNS:
        json.dump({"error": f"unknown pattern '{name}'", "availablePatterns": list(PATTERNS.keys())}, sys.stdout)
        sys.exit(0)


def walk_py(directory):
    for root, _dirs, names in os.walk(directory):
        for fn in sorted(names):
            if fn.endswith(".py"):
                yield os.path.join(root, fn)


findings = []
for f in walk_py(target):
    try:
        text = open(f, encoding="utf-8").read()
    except OSError:
        continue
    for line_no, raw in enumerate(text.split("\n"), start=1):
        for pattern, suggestion in PATTERNS[name]:
            if re.search(pattern, raw):
                findings.append({
                    "pattern": name,
                    "file": f,
                    "line": line_no,
                    "matched": raw.strip(),
                    "suggestion": suggestion,
                })

# best-effort outdated-packages hint
if "outdated-packages" in selected:
    findings.append({"pattern": "outdated-packages", "file": "-", "line": 0,
                     "matched": "pip list", "suggestion": "Compare installed versions against PyPI for latest releases."})

md = ["# Migration Audit Report", "", f"Patterns: {', '.join(selected)}", ""]
for it in findings:
    md.append(f"- **[{it['pattern']}]** `{it['file']}:{it['line']}` — `{it['matched']}`")
    md.append(f"  → {it['suggestion']}")

md_path = os.path.join(out_dir, "migration_report.md")
try:
    with open(md_path, "w", encoding="utf-8") as fh:
        fh.write("\n".join(md))
except OSError:
    pass

json.dump({"findings": findings, "summary": {"total": len(findings), "byPattern": {p: sum(1 for f in findings if f["pattern"] == p) for p in selected}}}, sys.stdout, indent=2)