"""P1-8: 备份恢复必须升级到服务级验证。

历史:
- ``backup_verify.sh`` 之前只复制文件,然后验证 SQLite 文件能打开。
- 2026-06-14 严格复审判定这只是“文件级验证”,不构成“系统可恢复”。
- 修复后:
  1. ``backup_verify.sh`` 优先调用 venv python
  2. ``backup_restore_smoke.py`` 真的把 admin/orders DB 喂回 FastAPI TestClient
  3. 真实执行 /api/public/orders 等关键端点,确认恢复后系统可用
- 本测试锁定该行为,使未来回归(例如换成 ``python3``)立刻失败。
"""

from __future__ import annotations

import os
import shutil
import sqlite3
import subprocess
from pathlib import Path


REPO_ROOT = Path(__file__).resolve().parents[1]
SCRIPTS_DIR = REPO_ROOT / "scripts"


def _prepare_backup_dir(staging: Path) -> None:
    staging.mkdir(parents=True, exist_ok=True)
    db_dir = staging / "db"
    files_dir = staging / "files"
    config_dir = staging / "config"
    secrets_dir = staging / "secrets"
    db_dir.mkdir(parents=True, exist_ok=True)
    files_dir.mkdir(parents=True, exist_ok=True)
    config_dir.mkdir(parents=True, exist_ok=True)
    secrets_dir.mkdir(parents=True, exist_ok=True)

    src_orders = REPO_ROOT / "data" / "orders.db"
    src_share = REPO_ROOT / "data" / "share" / "short_links.db"
    src_admin = REPO_ROOT / "data" / "orders" / "admin.db"
    if src_orders.exists():
        shutil.copy(src_orders, db_dir / "orders.db")
    if src_share.exists():
        shutil.copy(src_share, db_dir / "short_links.db")
    if src_admin.exists():
        shutil.copy(src_admin, db_dir / "admin.db")

    (config_dir / ".env").write_text(
        "\n".join(
            [
                "GAOKAO_ENV=dev",
                "GAOKAO_PAYMENT_PROVIDER=mock",
                "GAOKAO_PAYMENT_BASE_URL=http://testserver",
                "GAOKAO_ADMIN_USER=admin",
            ]
        )
        + "\n",
        encoding="utf-8",
    )
    (secrets_dir / "jwt_secret").write_text(
        "backup-restore-jwt-secret-0123456789abcdef", encoding="utf-8"
    )
    (secrets_dir / "orders_fernet_key").write_text(
        "backup-restore-fernet-secret", encoding="utf-8"
    )
    (secrets_dir / "admin_pass").write_text(
        "backup-restore-pass-123", encoding="utf-8"
    )

    src_reports = REPO_ROOT / "data" / "share" / "reports"
    if src_reports.exists():
        shutil.copytree(src_reports, files_dir / "reports")

    examples_dir = files_dir / "examples"
    examples_dir.mkdir(parents=True, exist_ok=True)
    sample_html = REPO_ROOT / "data" / "examples" / "gaokao_report_李明_20260611_122443.html"
    sample_pdf = REPO_ROOT / "data" / "examples" / "gaokao_report_李明_20260611_122443.pdf"
    if sample_html.exists():
        shutil.copy(sample_html, examples_dir / sample_html.name)
    if sample_pdf.exists():
        shutil.copy(sample_pdf, examples_dir / sample_pdf.name)


def test_backup_verify_uses_venv_python_for_service_level_restore(tmp_path):
    staging = tmp_path / "backup"
    _prepare_backup_dir(staging)

    env = os.environ.copy()
    env.pop("GAOKAO_PYTHON_BIN", None)
    env.pop("PYTHON_BIN", None)

    proc = subprocess.run(
        ["bash", str(SCRIPTS_DIR / "backup_verify.sh"), "--from-backup", str(staging)],
        cwd=REPO_ROOT,
        env=env,
        text=True,
        capture_output=True,
        check=False,
    )

    assert proc.returncode == 0, (
        f"backup_verify.sh failed\nstdout:\n{proc.stdout}\nstderr:\n{proc.stderr}"
    )
    assert '"health_status": 200' in proc.stdout
    assert '"public_order_create": 201' in proc.stdout
    assert '"smoke_order_id"' in proc.stdout
    assert "ModuleNotFoundError" not in proc.stderr
    assert "ModuleNotFoundError" not in proc.stdout


def test_backup_verify_live_mode_uses_sqlite_backup_for_db_files(tmp_path):
    admin_db = tmp_path / "admin.db"
    verify_dir = tmp_path / "verify"
    live_conn = sqlite3.connect(admin_db)
    try:
        journal_mode = live_conn.execute("PRAGMA journal_mode=WAL").fetchone()
        assert journal_mode is not None
        assert str(journal_mode[0]).lower() == "wal"
        live_conn.execute("PRAGMA wal_autocheckpoint = 0")
        live_conn.execute(
            "CREATE TABLE restore_checks (id INTEGER PRIMARY KEY, value TEXT NOT NULL)"
        )
        live_conn.execute(
            "INSERT INTO restore_checks(value) VALUES (?)", ("present",)
        )
        live_conn.commit()

        proc = subprocess.run(
            ["bash", str(SCRIPTS_DIR / "backup_verify.sh"), str(verify_dir), "--skip-smoke"],
            cwd=REPO_ROOT,
            env={
                **os.environ,
                "GAOKAO_DB_PATH": str(admin_db),
            },
            text=True,
            capture_output=True,
            check=False,
        )
    finally:
        live_conn.close()

    assert proc.returncode == 0, proc.stderr
    staged_admin_db = verify_dir / "db" / "admin.db"
    conn = sqlite3.connect(staged_admin_db)
    try:
        tables = {
            row[0]
            for row in conn.execute(
                "SELECT name FROM sqlite_master WHERE type='table'"
            ).fetchall()
        }
        assert "restore_checks" in tables
        row = conn.execute("SELECT COUNT(*) FROM restore_checks").fetchone()
        assert row == (1,)
    finally:
        conn.close()


def test_backup_restore_smoke_fails_fast_when_admin_db_missing(tmp_path):
    staging = tmp_path / "backup"
    _prepare_backup_dir(staging)
    admin_db = staging / "db" / "admin.db"
    if admin_db.exists():
        admin_db.unlink()

    proc = subprocess.run(
        [
            str(REPO_ROOT / ".venv" / "bin" / "python"),
            str(SCRIPTS_DIR / "backup_restore_smoke.py"),
            "--backup-dir",
            str(staging),
        ],
        cwd=REPO_ROOT,
        text=True,
        capture_output=True,
        check=False,
        timeout=10,
    )

    assert proc.returncode != 0
    assert "restore precondition failed" in proc.stderr
    assert "db/admin.db" in proc.stderr


def test_backup_restore_smoke_fails_fast_when_config_env_missing(tmp_path):
    staging = tmp_path / "backup"
    _prepare_backup_dir(staging)
    shutil.rmtree(staging / "config")

    proc = subprocess.run(
        [
            str(REPO_ROOT / ".venv" / "bin" / "python"),
            str(SCRIPTS_DIR / "backup_restore_smoke.py"),
            "--backup-dir",
            str(staging),
        ],
        cwd=REPO_ROOT,
        text=True,
        capture_output=True,
        check=False,
        timeout=10,
    )

    assert proc.returncode != 0
    assert "restore precondition failed" in proc.stderr
    assert "config/" in proc.stderr


def test_backup_restore_smoke_uses_real_testclient_contract_marker():
    script = (SCRIPTS_DIR / "backup_restore_smoke.py").read_text(encoding="utf-8")
    assert "TestClient" in script
    assert "create_app" in script
    assert "/api/public/orders" in script