#!/usr/bin/env python3
"""Run `sarif-extract-scans` over a directory hierarchy of the form

    organization/project-sarif.json
    org2/proj2.sarif
    ...

mirroring the github org/project structure.  The list of sarif files to ingest is
in the file given by the sarif-files argument, a list of paths of the form

    <organization>/<project-sarif>

sarif-extract-scans-runner creates these files:

- successful_runs -- optional, one file.  Track saved file status and only re-run
  failed attempts

- org*/project*.scanspec -- one scanspec file per org/project listed in
  sarif-files.  Required by `sarif-extract-scans`

- org*/project*.scanlog -- failures from 'sarif-extract-scans' are logged here

It also creates the directories

- org*/project*.scantables -- one directory per org/project, each holding the
  tables produced by `sarif-extract-scans`:
    ├── codeflows.csv
    ├── projects.csv
    ├── results.csv
    └── scans.csv

As example:
    cd ../data/treeio
    sarif-extract-scans-runner -i1 -s successful-runs - <<EOF
2021-12-09/results.sarif
2022-02-25/results.sarif
EOF

writes out
    DATE   2022-08-08T14:32:41.962219
    OK     2021-12-09/results.sarif
    DATE   2022-08-08T14:32:42.970712
    OK     2022-02-25/results.sarif

and produces the files
    2021-12-09/
    ├── results.sarif.scanspec
    ├── results.sarif.scantables
        ├── codeflows.csv
        ├── projects.csv
        ├── results.csv
        └── scans.csv

    2022-02-25/
    ├── results.sarif.scanspec
    ├── results.sarif.scantables
        ├── codeflows.csv
        ├── projects.csv
        ├── results.csv
        └── scans.csv

on the first run; repeating
      sarif-extract-scans-runner -i1 -s successful-runs - <<EOF
2021-12-09/results.sarif
2022-02-25/results.sarif
EOF

will produce no output but run much faster.

Typical use for larger sarif file collections:
    cd /path/to/scans/root
    create sarif-files.txt
    nohup sarif-extract-scans-runner -s ses-successful-runs sarif-files.txt &

"""
import argparse
import subprocess
import json
import os
import sys
import pickle
from datetime import datetime
from sarif_cli import hash
#
# Handle arguments
#
parser = argparse.ArgumentParser(description='Run sarif-extract-scans over a directory hierarchy')

parser.add_argument('sarif_files', metavar='sarif-files', type=str, help='File containing list of sarif files, use - for stdin')

parser.add_argument('-f','--input-signature', metavar='input-signature', type=str, default="CLI", 
                    help='Signature of the sarif, as in, where it was generated it may affect the signature.\n'
                    'Options: LGTM, CLI.\n'
                    'If current represented signatures are not sufficient, view signature_single.py for how to support further signatures.'
                    '  Default: "%(default)s"')

parser.add_argument('-o','--outdir', metavar='output-dir', type=str, default="", help='Output directory')

parser.add_argument('-m', '--max-files', metavar='number', type=int, default=100000,
                    help='Maximum number of files to process.'
                    '  Default: %(default)d')

parser.add_argument('-i', '--update-interval', metavar='N', type=int, default=10,
                    help='Update status and save state after processing N files.'
                    '  Default: %(default)d')

parser.add_argument('-s', '--successful-runs', metavar='filename', type=str,
                    default="",
                    help='Incremental running support: Track successful runs and only (re)run '
                    'new/failed entries from sarif-files.'
                    '  Default: "%(default)s"')

parser.add_argument('-t', '--with-timestamps', action='store_true',
                    help='Read names of files containing timestamp information '
                    'following the name of the sarif source file.'
                    'E.g., '
                    'sarif-extract-scans-runner --with-timestamps - << EOF '
                    'foo.sarif,timestamps.json '
                    'EOF '
                    'Note: spaces are NOT stripped, so foo.sarif,timestamps.json '
                    'and foo.sarif, timestamps.json are different.'
                    )

parser.add_argument('--doc', dest='fulldoc', default=False,
                    action='store_true', 
                    help='Print full documentation for this script')

# Avoid argparse error when only --doc is given
if len(sys.argv) == 2 and sys.argv[1] == '--doc':
    print(__doc__)
    sys.exit(0)

args = parser.parse_args()

# 
# Create outermost output directory (like <outer_dir>/*/*.scantables)
# 
outer_dir = args.outdir
if outer_dir != "":
    outer_dir+="/"
    try: 
        os.mkdir(outer_dir, mode=0o755)
    except FileExistsError: 
        pass

if args.input_signature not in ["LGTM","CLI"]:
    print("Unsupported sarif signature requested.")
    print("Use one of [LGTM, CLI].")
    sys.exit(0)

#
# Collect sarif file information
# 
with open(args.sarif_files, 'r') if args.sarif_files != '-' else sys.stdin as fp:
    paths = fp.readlines()

# Use saved status, only re-run failed attempts
use_successful_runs = args.successful_runs != ""
if use_successful_runs:
    if  os.path.exists(args.successful_runs):
        with open(args.successful_runs, "rb") as infile:
            successful_runs = pickle.load(infile)
    else:
        successful_runs = set()

count = -1
for path_timestamp in paths:
    if args.with_timestamps:
        path, t1 = path_timestamp.split(',')
        timestamp_fname = t1.strip()
    else:
        path = path_timestamp

    count += 1
    if count > args.max_files: break
    # 
    # Paths and components
    # 
    path = path.rstrip()
    # 
    # Scan specification
    # 
    # scan id as hash of sarif file contents
    with open(path, 'rb') as f:
        data = f.read()
        scan_id = hash.hash_unique(data)

    if args.with_timestamps:
        scan_spec = {
            "scan_id": scan_id,                        # pd.Int64Dtype()
            "sarif_file_name": path,                   # pd.StringDtype()
            "timestamp_file_name": timestamp_fname
        }
    else:
        scan_spec = {
            "scan_id": scan_id,                        # pd.Int64Dtype()
            "sarif_file_name": path,                   # pd.StringDtype()
        }
    # 
    # If using outermost output directory, create project directory:
    # (like <outer_dir>/<repositoryUri>/*.scantables)
    # 
    try: os.mkdir(outer_dir+ path, mode=0o755)
    except FileExistsError: pass

    scan_spec_file = os.path.join(outer_dir+ path + ".scanspec")
    with open(scan_spec_file, 'w') as fp:
        json.dump(scan_spec, fp)

    # 
    # Table output directory
    # 
    output_dir = os.path.join(outer_dir+ path + ".scantables")
    try: os.mkdir(output_dir, mode=0o755)
    except FileExistsError: pass
    #
    # Run sarif-extract-scans
    # 
    if use_successful_runs:
        if path in successful_runs:
            # Don't rerun
            continue

    # Some timing information
    if count % args.update_interval == 0:
        print("{:6} {}".format("DATE", datetime.now().isoformat()))
    
    # Save occasionally
    if count % args.update_interval == 0:
        if use_successful_runs:
            with open(args.successful_runs, 'wb') as outfile:
                pickle.dump(successful_runs, outfile)

    scan_log_file = os.path.join(outer_dir+ path + ".scanlog")
    csv_outfile = os.path.join(outer_dir+ path)
    if args.with_timestamps:
        timestamp_options = ['--with-timestamps']
    else:
        timestamp_options = []
    # XX:
    runstats = subprocess.run(['sarif-extract-scans', scan_spec_file,
                               output_dir, csv_outfile, "-f",
                               args.input_signature],
                              capture_output=True, text=True)

    if runstats.returncode == 0:
        print("{:6} {}".format("OK", path))
        if use_successful_runs:
            successful_runs.add(path)
    else:
        print("{:6} {} {}".format("FAIL", path, scan_log_file))
        # log error
        with open(scan_log_file, 'w') as fp:
            fp.write(runstats.stderr)

        # show command for manual re-run
        cmd = [
            "sarif-extract-scans",
            scan_spec_file,
            output_dir,
            csv_outfile,
            "-f", args.input_signature,
        ]
        print("{:6} {}".format("", "Command was:"))
        print("{:6} {}".format("", " ".join(cmd)))


        # report only tail of stderr
        print("{:6} {}".format("", "Error tail:"))
        if runstats.stderr:
            for line in runstats.stderr.splitlines()[-6:]:
                print("{:6} {}".format("", line))


if use_successful_runs:
    with open(args.successful_runs, 'wb') as outfile:
        pickle.dump(successful_runs, outfile)