import os
import sys
import json
import socket
import struct
import sqlite3
import unittest
import urllib.request
import warnings
from datetime import datetime, timezone, timedelta

warnings.filterwarnings("ignore")

# Ensure parent directory and src directory are in path to import Server
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "src")))

import Server
import pgpy


class TestServerComponent(unittest.TestCase):
    def setUp(self):
        self.test_db = "test_server_state.db"
        self.test_config = "test_server_config.json"
        if os.path.exists(self.test_db):
            os.remove(self.test_db)
        if os.path.exists(self.test_config):
            os.remove(self.test_config)

    def tearDown(self):
        if os.path.exists(self.test_db):
            try:
                os.remove(self.test_db)
            except Exception:
                pass
        if os.path.exists(self.test_config):
            try:
                os.remove(self.test_config)
            except Exception:
                pass

    def test_first_run_config_and_keypair_generation(self):
        config = Server.load_or_init_config(self.test_config)
        self.assertTrue(os.path.exists(self.test_config))
        self.assertIn("server_fingerprint", config)
        self.assertIn("public_key", config)
        self.assertIn("private_key", config)
        self.assertIn("auth_token", config)
        self.assertNotIn("site_name", config)

        # Verify keypair
        priv_key, _ = pgpy.PGPKey.from_blob(config["private_key"])
        pub_key, _ = pgpy.PGPKey.from_blob(config["public_key"])
        self.assertEqual(str(pub_key.fingerprint), config["server_fingerprint"])

    def test_create_client_config(self):
        Server.load_or_init_config(self.test_config)
        client_out = "test_client_out.json"
        try:
            client_conf = Server.create_client_config(
                server_host="10.0.0.1",
                server_port=9443,
                output_path=client_out,
                config_path=self.test_config
            )
            self.assertTrue(os.path.exists(client_out))
            self.assertEqual(client_conf["server_host"], "10.0.0.1")
            self.assertEqual(client_conf["server_port"], 9443)
            # Verify no machine name or site_name is included
            self.assertNotIn("server_name", client_conf)
            self.assertNotIn("name", client_conf)
            self.assertNotIn("site_name", client_conf)
        finally:
            if os.path.exists(client_out):
                os.remove(client_out)

    def test_4_run_rule_and_12h_window(self):
        Server.init_db(self.test_db)
        log_entry = {
            "server": "app-worker-01.corp.local",
            "signature": "PostgresConnWarning",
            "severity": "WARNING",
            "message": "Connection to database pool near capacity: 85%",
            "os_type": "linux"
        }
        payload = {
            "server": "app-worker-01.corp.local",
            "logs": [log_entry]
        }

        # Runs 1 to 3: WARNING should remain TRANSIENT
        for run_idx in range(1, 4):
            res = Server.process_ingested_logs(payload, self.test_db, window_hours=12, min_runs=4)
            self.assertEqual(res["status"], "success")
            self.assertEqual(res["promoted_verified"], 0)

        conn = sqlite3.connect(self.test_db)
        c = conn.cursor()
        c.execute("SELECT run_count, status FROM active_issues WHERE signature = ?", ("PostgresConnWarning",))
        row = c.fetchone()
        conn.close()
        self.assertEqual(row[0], 3)
        self.assertEqual(row[1], "TRANSIENT")

        # Run 4: promotes WARNING to VERIFIED!
        res4 = Server.process_ingested_logs(payload, self.test_db, window_hours=12, min_runs=4)
        self.assertEqual(res4["promoted_verified"], 1)

        conn = sqlite3.connect(self.test_db)
        c = conn.cursor()
        c.execute("SELECT run_count, status FROM active_issues WHERE signature = ?", ("PostgresConnWarning",))
        row = c.fetchone()
        conn.close()
        self.assertEqual(row[0], 4)
        self.assertEqual(row[1], "VERIFIED")

    def test_error_immediate_pass(self):
        Server.init_db(self.test_db)
        log_entry = {
            "server": "app-worker-01.corp.local",
            "signature": "KernelPanicCritical",
            "severity": "ERROR",
            "message": "Kernel panic - not syncing: Fatal hardware error",
            "os_type": "linux"
        }
        payload = {
            "server": "app-worker-01.corp.local",
            "logs": [log_entry]
        }

        # Run 1: ERROR must immediately promote to VERIFIED
        res = Server.process_ingested_logs(payload, self.test_db, window_hours=12, min_runs=4)
        self.assertEqual(res["status"], "success")
        self.assertEqual(res["promoted_verified"], 1)

        conn = sqlite3.connect(self.test_db)
        c = conn.cursor()
        c.execute("SELECT run_count, status, severity FROM active_issues WHERE signature = ?", ("KernelPanicCritical",))
        row = c.fetchone()
        conn.close()
        self.assertIsNotNone(row)
        self.assertEqual(row[0], 1)
        self.assertEqual(row[1], "VERIFIED")
        self.assertEqual(row[2], "ERROR")

    def test_server_severity_filtering(self):
        Server.init_db(self.test_db)
        payload = {
            "server": "app-worker-01.corp.local",
            "logs": [
                {"server": "app-worker-01", "signature": "SigInfo", "severity": "INFO", "message": "Info msg", "os_type": "linux"},
                {"server": "app-worker-01", "signature": "SigWarn", "severity": "WARNING", "message": "Warn msg", "os_type": "linux"},
                {"server": "app-worker-01", "signature": "SigErr", "severity": "ERROR", "message": "Err msg", "os_type": "linux"},
                {"server": "app-worker-01", "signature": "SigDebug", "severity": "DEBUG", "message": "Debug msg", "os_type": "linux"},
                {"server": "app-worker-01", "signature": "SigTrace", "severity": "TRACE", "message": "Trace msg", "os_type": "linux"}
            ]
        }
        res = Server.process_ingested_logs(payload, self.test_db, window_hours=12, min_runs=4)
        self.assertEqual(res["status"], "success")

        conn = sqlite3.connect(self.test_db)
        c = conn.cursor()
        c.execute("SELECT signature, status FROM active_issues ORDER BY signature")
        rows = dict(c.fetchall())
        conn.close()

        self.assertIn("SigInfo", rows)
        self.assertIn("SigWarn", rows)
        self.assertIn("SigErr", rows)
        self.assertNotIn("SigDebug", rows)
        self.assertNotIn("SigTrace", rows)

        # SigErr is immediately VERIFIED; SigWarn and SigInfo are TRANSIENT on run 1
        self.assertEqual(rows["SigErr"], "VERIFIED")
        self.assertEqual(rows["SigWarn"], "TRANSIENT")
        self.assertEqual(rows["SigInfo"], "TRANSIENT")

    def test_license_schema_and_pki_generation(self):
        secret = "test-secret-12345"
        Server.init_db(self.test_db, enrollment_secret=secret, max_seats=5)

        conn = sqlite3.connect(self.test_db)
        c = conn.cursor()
        c.execute("SELECT max_seats, enrollment_secret FROM license_config WHERE id = 1")
        row = c.fetchone()
        conn.close()

        self.assertIsNotNone(row)
        self.assertEqual(row[0], 5)
        self.assertEqual(row[1], secret)

        # Test Dynamic PKI
        test_cert_dir = "test_certs_pki"
        try:
            ca_cert, ca_key, ca_pem, ca_key_pem = Server.enrollment.generate_ca_if_needed(cert_dir=test_cert_dir)
            self.assertIn("BEGIN CERTIFICATE", ca_pem)
            self.assertIn("BEGIN RSA PRIVATE KEY", ca_key_pem)

            srv_cert, srv_key, srv_pem, srv_key_pem = Server.enrollment.generate_server_cert_if_needed(
                ca_cert, ca_key, hostnames=["127.0.0.1", "localhost"], cert_dir=test_cert_dir
            )
            self.assertIn("BEGIN CERTIFICATE", srv_pem)

            client_cert_pem, client_key_pem = Server.enrollment.issue_client_cert("node-test-1", ca_cert, ca_key)
            self.assertIn("BEGIN CERTIFICATE", client_cert_pem)
            self.assertIn("BEGIN RSA PRIVATE KEY", client_key_pem)

            fp = Server.enrollment.calculate_cert_fingerprint(client_cert_pem)
            self.assertEqual(len(fp), 64)
        finally:
            import shutil
            if os.path.exists(test_cert_dir):
                shutil.rmtree(test_cert_dir, ignore_errors=True)

    def test_enrollment_endpoint_and_seat_quota(self):
        from fastapi import HTTPException
        secret = "super-secret-enrollment"
        max_seats = 2
        Server.init_db(self.test_db, enrollment_secret=secret, max_seats=max_seats)

        test_cert_dir = "test_certs_enroll"
        try:
            ca_cert, ca_key, ca_pem, _ = Server.enrollment.generate_ca_if_needed(cert_dir=test_cert_dir)
            Server.SERVER_STATE["config"] = {"db_path": self.test_db}
            Server.SERVER_STATE["ca_cert"] = ca_cert
            Server.SERVER_STATE["ca_key"] = ca_key
            Server.SERVER_STATE["ca_cert_pem"] = ca_pem

            # 1. Invalid secret should raise 403
            bad_req = Server.ClientEnrollRequest(
                client_id="client-1",
                hostname="host-1",
                os="linux",
                enrollment_secret="wrong-secret"
            )
            with self.assertRaises(HTTPException) as cm:
                Server.enroll_client(bad_req)
            self.assertEqual(cm.exception.status_code, 403)

            # 2. Valid enrollment for client 1
            req1 = Server.ClientEnrollRequest(
                client_id="client-1",
                hostname="host-1",
                os="linux",
                enrollment_secret=secret
            )
            resp1 = Server.enroll_client(req1)
            self.assertIn("client_cert", resp1)
            self.assertIn("client_key", resp1)
            self.assertEqual(resp1["ca_cert"], ca_pem)

            # 3. Valid enrollment for client 2
            req2 = Server.ClientEnrollRequest(
                client_id="client-2",
                hostname="host-2",
                os="windows",
                enrollment_secret=secret
            )
            resp2 = Server.enroll_client(req2)
            self.assertIn("client_cert", resp2)

            # 4. Seat quota exhausted: client 3 should raise 403
            req3 = Server.ClientEnrollRequest(
                client_id="client-3",
                hostname="host-3",
                os="linux",
                enrollment_secret=secret
            )
            with self.assertRaises(HTTPException) as cm:
                Server.enroll_client(req3)
            self.assertEqual(cm.exception.status_code, 403)
            self.assertIn("License seat limit reached", cm.exception.detail)

            # 5. Re-enrollment for existing client 1 should succeed
            resp1_re = Server.enroll_client(req1)
            self.assertIn("client_cert", resp1_re)

            # 6. Revoked client should be rejected
            conn = sqlite3.connect(self.test_db)
            conn.execute("UPDATE clients SET status = 'revoked' WHERE client_id = 'client-1'")
            conn.commit()
            conn.close()

            with self.assertRaises(HTTPException) as cm:
                Server.enroll_client(req1)
            self.assertEqual(cm.exception.status_code, 403)
            self.assertIn("revoked", cm.exception.detail)
        finally:
            import shutil
            if os.path.exists(test_cert_dir):
                shutil.rmtree(test_cert_dir, ignore_errors=True)


if __name__ == "__main__":
    unittest.main()