#!/usr/bin/python3
# SPDX-License-Identifier: GPL-2.0+

import argparse
import collections
import contextlib
import datetime
import lzma
import os.path
import sqlite3
import subprocess
import time

from common import decompress_stream, yield_lines, yield_chunks

def scan_log_status(filelike):
    it = yield_chunks(filelike)
    it = decompress_stream(it, lzma.LZMADecompressor())
    it = yield_lines(it)
    last_lines = collections.deque(it, 25)
    status = [l.split(b':', 1)[1].strip()
              for l in last_lines if l.startswith(b"Status:")]
    if status:
        return status[0].decode("ascii")
    return "unknown"


def do_build(source, version, architecture, server):
    now = datetime.datetime.utcnow().replace(microsecond=0)
    logtarget = "%s_%s_%s_%s.log.xz" % (source, version, architecture,
                                        now.strftime("%Y%m%d%H%M%S"))
    cmdline = ["ssh", server, "sh", "/dev/stdin", architecture,
               "%s_%s" % (source, version)]
    with open(os.path.join("logs", logtarget), "w+b") as output:
        with open("build.sh", "rb") as instructions:
            code = subprocess.call(cmdline, stdin=instructions, stdout=output)
        output.seek(0)
        status = scan_log_status(output)
        print("status %s code %d" % (status, code))
    return (now, code == 0, logtarget, status == "given-back")

def main():
    argp = argparse.ArgumentParser()
    argp.add_argument("server", help="machine to build on")
    args = argp.parse_args()
    db = sqlite3.connect("db", detect_types=sqlite3.PARSE_DECLTYPES)
    with contextlib.closing(db.cursor()) as cur:
        cur.execute("""
            SELECT d.source, d.version, d.architecture, r.rowid
                FROM depstate AS d
                    JOIN buildrequests AS r
                        ON d.architecture = ifnull(r.architecture, d.architecture)
                            AND d.source = r.source
                    JOIN depcheck
                        ON d.architecture = depcheck.architecture
                WHERE d.satisfiable = 1 AND depcheck.giveback = 0
                ORDER BY r.priority DESC, r.requesttime ASC LIMIT 1;""")
        row = cur.fetchone()
        if not row:
            cur.execute("""
                SELECT source, version, depstate.architecture, NULL
                    FROM depstate JOIN depcheck
                        ON depstate.architecture = depcheck.architecture
                    WHERE satisfiable = 1 AND giveback = 0
                    ORDER BY random() LIMIT 1;""")
            row = cur.fetchone()
    if not row:
        print("no package satisfiable")
        time.sleep(60)
        return
    source, version, architecture, requestid = row
    print("building %s_%s for %s%s" %
          (source, version, architecture,
           "" if requestid is None else " (request %d)" % requestid))
    timestamp, success, filename, giveback = \
        do_build(source, version, architecture, args.server)
    with contextlib.closing(db.cursor()) as cur:
        cur.execute("INSERT INTO builds (source, version, architecture, success, starttime, filename) VALUES (?, ?, ?, ?, ?, ?);",
                    (source, version, architecture, success, timestamp,
                     filename))
        if requestid is not None:
            cur.execute("DELETE FROM buildrequests WHERE rowid = ?;",
                        (requestid,))
        if giveback:
            cur.execute("UPDATE depcheck SET giveback = 1 WHERE architecture = ?;",
                        (architecture,))
    db.commit()

if __name__ == "__main__":
    main()