import inspect
import logging
import os
import re
import subprocess
from typing import Dict, Any

from pyhttpd.certs import CertificateSpec
from pyhttpd.conf import HttpdConf
from pyhttpd.env import HttpdTestEnv, HttpdTestSetup

log = logging.getLogger(__name__)


class H2TestSetup(HttpdTestSetup):

    def __init__(self, env: 'HttpdTestEnv'):
        super().__init__(env=env)
        self.add_source_dir(os.path.dirname(inspect.getfile(H2TestSetup)))
        self.add_modules(["http2", "proxy_http2", "cgid", "autoindex", "ssl"])

    def make(self):
        super().make()
        self._add_h2test()
        self._setup_data_1k_1m()

    def _add_h2test(self):
        local_dir = os.path.dirname(inspect.getfile(H2TestSetup))
        p = subprocess.run([self.env.apxs, '-c', 'mod_h2test.c'],
                           capture_output=True,
                           cwd=os.path.join(local_dir, 'mod_h2test'))
        rv = p.returncode
        if rv != 0:
            log.error(f"compiling md_h2test failed: {p.stderr}")
            raise Exception(f"compiling md_h2test failed: {p.stderr}")

        modules_conf = os.path.join(self.env.server_dir, 'conf/modules.conf')
        with open(modules_conf, 'a') as fd:
            # load our test module which is not installed
            fd.write(f"LoadModule h2test_module   \"{local_dir}/mod_h2test/.libs/mod_h2test.so\"\n")

    def _setup_data_1k_1m(self):
        s90 = "01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678\n"
        with open(os.path.join(self.env.gen_dir, "data-1k"), 'w') as f:
            for i in range(10):
                f.write(f"{i:09d}-{s90}")
        with open(os.path.join(self.env.gen_dir, "data-10k"), 'w') as f:
            for i in range(100):
                f.write(f"{i:09d}-{s90}")
        with open(os.path.join(self.env.gen_dir, "data-100k"), 'w') as f:
            for i in range(1000):
                f.write(f"{i:09d}-{s90}")
        with open(os.path.join(self.env.gen_dir, "data-1m"), 'w') as f:
            for i in range(10000):
                f.write(f"{i:09d}-{s90}")


class H2TestEnv(HttpdTestEnv):

    @classmethod
    @property
    def is_unsupported(cls):
        mpm_module = f"mpm_{os.environ['MPM']}" if 'MPM' in os.environ else 'mpm_event'
        return mpm_module == 'mpm_prefork'

    def __init__(self, pytestconfig=None):
        super().__init__(pytestconfig=pytestconfig)
        self.add_httpd_conf([
            "H2MinWorkers 1",
            "H2MaxWorkers 64",
            "Protocols h2 http/1.1 h2c",
        ])
        self.add_httpd_log_modules(["http2", "proxy_http2", "h2test", "proxy", "proxy_http"])
        self.add_cert_specs([
            CertificateSpec(domains=[
                f"push.{self._http_tld}",
                f"hints.{self._http_tld}",
                f"ssl.{self._http_tld}",
                f"pad0.{self._http_tld}",
                f"pad1.{self._http_tld}",
                f"pad2.{self._http_tld}",
                f"pad3.{self._http_tld}",
                f"pad8.{self._http_tld}",
            ]),
            CertificateSpec(domains=[f"noh2.{self.http_tld}"], key_type='rsa2048'),
        ])

        self.httpd_error_log.set_ignored_lognos([
            'AH02032',
            'AH01276',
            'AH01630',
            'AH00135',
            'AH02261',  # Re-negotiation handshake failed (our test_101)
            'AH03490',  # scoreboard full, happens on limit tests
            'AH02429',  # invalid chars in response header names, see test_h2_200
            'AH02430',  # invalid chars in response header values, see test_h2_200
            'AH10373',  # SSL errors on uncompleted handshakes, see test_h2_105
        ])
        self.httpd_error_log.add_ignored_patterns([
            re.compile(r'.*malformed header from script \'hecho.py\': Bad header: x.*'),
            re.compile(r'.*:tls_post_process_client_hello:.*'),
            # OSSL 3 dropped the function name from the error description. Use the code instead:
            # 0A0000C1 = no shared cipher -- Too restrictive SSLCipherSuite or using DSA server certificate?
            re.compile(r'.*SSL Library Error: error:0A0000C1:.*'),
            re.compile(r'.*:tls_process_client_certificate:.*'),
            # OSSL 3 dropped the function name from the error description. Use the code instead:
            # 0A0000C7 = peer did not return a certificate -- No CAs known to server for verification?
            re.compile(r'.*SSL Library Error: error:0A0000C7:.*'),
            re.compile(r'.*have incompatible TLS configurations.'),
        ])

    def setup_httpd(self, setup: HttpdTestSetup = None):
        super().setup_httpd(setup=H2TestSetup(env=self))


class H2Conf(HttpdConf):

    def __init__(self, env: HttpdTestEnv, extras: Dict[str, Any] = None):
        super().__init__(env=env, extras=HttpdConf.merge_extras(extras, {
            f"cgi.{env.http_tld}": [
                "SSLOptions +StdEnvVars",
                "AddHandler cgi-script .py",
                "<Location \"/h2test/echo\">",
                "    SetHandler h2test-echo",
                "</Location>",
                "<Location \"/h2test/delay\">",
                "    SetHandler h2test-delay",
                "</Location>",
            ]
        }))

    def start_vhost(self, domains, port=None, doc_root="htdocs", with_ssl=None,
                    ssl_module=None, with_certificates=None):
        super().start_vhost(domains=domains, port=port, doc_root=doc_root,
                            with_ssl=with_ssl, ssl_module=ssl_module,
                            with_certificates=with_certificates)
        if f"noh2.{self.env.http_tld}" in domains:
            protos = ["http/1.1"]
        elif port == self.env.https_port or with_ssl is True:
            protos = ["h2", "http/1.1"]
        else:
            protos = ["h2c", "http/1.1"]
        if f"test2.{self.env.http_tld}" in domains:
            protos = reversed(protos)
        self.add(f"Protocols {' '.join(protos)}")
        return self

    def add_vhost_noh2(self):
        domains = [f"noh2.{self.env.http_tld}", f"noh2-alias.{self.env.http_tld}"]
        self.start_vhost(domains=domains, port=self.env.https_port, doc_root="htdocs/noh2")
        self.add(["Protocols http/1.1", "SSLOptions +StdEnvVars"])
        self.end_vhost()
        self.start_vhost(domains=domains, port=self.env.http_port, doc_root="htdocs/noh2")
        self.add(["Protocols http/1.1", "SSLOptions +StdEnvVars"])
        self.end_vhost()
        return self

    def add_vhost_test1(self, proxy_self=False, h2proxy_self=False):
        return super().add_vhost_test1(proxy_self=proxy_self, h2proxy_self=h2proxy_self)

    def add_vhost_test2(self):
        return super().add_vhost_test2()