from __future__ import annotations

import argparse
import importlib.util
import json
import os
import subprocess
import sys
from collections.abc import Mapping
from dataclasses import dataclass
from pathlib import Path
from types import MappingProxyType, ModuleType
from typing import Final

GROUPS: Final = MappingProxyType(
    {
        "management": ("management", "authorization", "configuration"),
        "accounting": ("pricing", "spend", "caching"),
        "database": ("database",),
        "providers": ("providers", "routing", "streaming", "messages_endpoint", "translation"),
        "extensions": ("observability", "compatibility"),
        "mcp": ("mcp",),
        "sdk": ("sdk",),
        "cost": ("cost_calculation",),
        "security": ("security",),
    }
)
GITHUB_FILES: Final = frozenset(
    {
        "tests/integration/database/test_roi_observed.py",
        "tests/integration/database/image/test_component_image_serves_offline.py",
        "tests/integration/database/image/test_image_admin_mcp.py",
        "tests/integration/database/image/test_image_bedrock_realtime_extra.py",
        "tests/integration/database/image/test_offline_image_migration.py",
        "tests/integration/database/image/test_ui_image_serves_offline.py",
        "tests/integration/mcp/test_interactions.py",
        "tests/integration/sdk/test_redis_cluster_iam_auth.py",
    }
)


PEER_GROUPS: Final = frozenset({"management", "mcp"})
COST_MAP_GROUPS: Final = frozenset({"cost"})


@dataclass(frozen=True, slots=True)
class Selection:
    nodes: tuple[str, ...]
    foreign: tuple[str, ...]


def file_of(node: str) -> str:
    return node.split("::", 1)[0]


def select(requested: tuple[str, ...], group_files: tuple[str, ...]) -> Selection:
    members: Final = frozenset(group_files)
    return Selection(
        nodes=requested or group_files,
        foreign=tuple(sorted({node for node in requested if file_of(node) not in members})),
    )


def uncollected(nodes: tuple[str, ...], collected: frozenset[str]) -> tuple[str, ...]:
    collected_files: Final = frozenset(file_of(node) for node in collected)
    return tuple(node for node in nodes if file_of(node) not in collected_files)


def worker_settings(group: str, workers: int) -> Mapping[str, str]:
    if workers < 2:
        return MappingProxyType({})
    return MappingProxyType(
        {
            "INTEGRATION_WORKER_ISOLATION": "1",
            "INTEGRATION_WORKER_PEER": "1" if group in PEER_GROUPS else "",
            "INTEGRATION_WORKER_COST_MAP": "1" if group in COST_MAP_GROUPS else "",
        }
    )


def _budget() -> ModuleType:
    specification: Final = importlib.util.spec_from_file_location(
        "integration_budget", Path(__file__).with_name("_support") / "budget.py"
    )
    assert specification is not None and specification.loader is not None
    module: Final = importlib.util.module_from_spec(specification)
    specification.loader.exec_module(module)
    return module


def main() -> int:
    parser: Final = argparse.ArgumentParser()
    parser.add_argument("group", choices=tuple(GROUPS))
    parser.add_argument("--results", type=Path, default=Path("test-results/integration"))
    parser.add_argument("--seed", type=int, default=int(os.environ.get("INTEGRATION_SEED", "4106601")))
    parser.add_argument("--order-seed", type=int, default=int(os.environ.get("INTEGRATION_ORDER_SEED", "0")))
    parser.add_argument("--workers", type=int, default=int(os.environ.get("INTEGRATION_WORKERS", "1")))
    parser.add_argument("--shards", type=int, default=int(os.environ.get("INTEGRATION_CASE_SHARDS", "1")))
    parser.add_argument("--shard-index", type=int, default=int(os.environ.get("INTEGRATION_CASE_SHARD_INDEX", "0")))
    parser.add_argument("--shard-files", type=Path)
    parser.add_argument("--list", action="store_true", help="print selected candidate files and exit")
    parser.add_argument("files", nargs="*", help="run only these files, or pytest node ids inside them, of the group")
    options: Final = parser.parse_intermixed_args()
    root: Final = Path(__file__).resolve().parents[2]
    group_files: Final = tuple(
        str(path.relative_to(root))
        for folder in GROUPS[options.group]
        for path in sorted((root / "tests/integration" / folder).rglob("test_*.py"))
        if str(path.relative_to(root)) not in GITHUB_FILES
    )
    selection: Final = select(tuple(options.files), group_files)
    if selection.foreign:
        parser.error(f"Not in the {options.group} group: {', '.join(selection.foreign)}")
    if not selection.nodes:
        parser.error(f"No integration test files selected for {options.group}")
    if options.list:
        sys.stdout.write("\n".join(sorted({file_of(node) for node in selection.nodes})) + "\n")
        return 0
    output: Final = options.results.resolve()
    output.mkdir(parents=True, exist_ok=True)
    environment: Final = {
        **os.environ,
        "PYTHONPATH": os.pathsep.join((str(root), str(root / "tests"), str(root / "tests/e2e"))),
        "INTEGRATION_RESULTS_DIR": str(output),
        "LITELLM_LOCAL_MODEL_COST_MAP": "True",
        "LITELLM_MODE": "PRODUCTION",
        "PYTHON_DOTENV_DISABLED": "1",
        **worker_settings(options.group, options.workers),
    }
    budget: Final = _budget()
    proxy_root: Final = Path(os.environ.get("INTEGRATION_PROXY_ROOT") or root)
    imported: Final = float(
        os.environ.get(budget.IMPORT_SECONDS_VARIABLE) or budget.measure_import_seconds(proxy_root, environment)
    )
    (output / "boot-calibration.json").write_text(budget.calibration(imported) + "\n")
    result: Final = subprocess.call(
        [
            sys.executable,
            "-m",
            "pytest",
            *selection.nodes,
            "-vv",
            "-rs",
            "--strict-markers",
            "-p",
            "no:pytest-retry",
            "-p",
            "no:rerunfailures",
            f"--timeout={int(budget.case_timeout_for(imported))}",
            "--durations=15",
            "--tb=short",
            f"--hypothesis-seed={options.seed}",
            f"--integration-order-seed={options.order_seed}",
            f"--integration-shard-count={options.shards}",
            f"--integration-shard-index={options.shard_index}",
            *(("--integration-shard-files", str(options.shard_files)) if options.shard_files is not None else ()),
            f"--junitxml={output / 'junit.xml'}",
            "-o",
            "junit_family=xunit1",
            *(("-n", str(options.workers)) if options.workers > 1 else ()),
            *(("--dist=loadgroup",) if options.workers > 1 else ()),
        ],
        cwd=root,
        env={**environment, budget.IMPORT_SECONDS_VARIABLE: str(imported)},
    )
    if result != 0:
        return result
    evidence: Final = json.loads((output / "execution.json").read_text())
    empty: Final = uncollected(selection.nodes, frozenset(evidence["inventory"]))
    if empty:
        sys.stderr.write(f"Selected integration files collected zero tests: {', '.join(empty)}\n")
        return 1
    if not evidence["complete"]:
        sys.stderr.write("Integration run did not complete: a collected node neither passed nor skipped\n")
        return 1
    return 0


if __name__ == "__main__":
    raise SystemExit(main())