"""
Capability probes — the adversarial half of the conformance gate.

A probe answers one question about one (capability, adapter) pair: *is this
capability actually wired into this adapter?* It answers by inspecting the
backend's own source for the concrete artifact the capability requires — a
route registration, an exported renderer, a management command, a call into the
shared core. It never asks the adapter to self-report (a self-report is the
thing that drifts), and it never reads a parity table (that would be circular).

The single invariant: **a probe goes green only when the wiring exists.** You
cannot flip a cell by editing prose, a docstring, or a README — only by adding
the route / module / binding the probe looks for.

Two facts learned by building this and watching it lie, now load-bearing:

1. Comments are the false-positive engine. A doc-comment that says "the JS side
   re-wraps it into a Promise.reject" made an auth-enforcement probe pass on the
   word `reject`. So source is comment-stripped per language before matching,
   and patterns target code identifiers (`MizanError::Unauthorized`, a route
   macro, an exported function name), never prose-able words.

2. AFI-common logic lives in the shared core; the adapter rides it. FastAPI's
   JWT/MWT support *is* `mizan_core.auth.authenticate` — there is no `jwt`
   literal in the FastAPI adapter, because the adapter delegates. Axum's KDL IR
   lives in `cores/mizan-rust`, not the axum crate. So capabilities that are
   genuinely core-provided (`jwt`, `mwt`, `ir_export`) probe the BACKEND scope
   (adapter + its language core); capabilities the adapter must wire to its own
   transport (the header on the response, the route, the manifest command, the
   WebSocket handler) probe the ADAPTER scope only.

Depth. These are *source-surface* probes: they confirm the artifact is present,
not that it behaves correctly under load. Runtime-behavior depth (mount, drive,
assert the wire bytes) is owed per adapter and lands with each gap's closure —
the runtime probe is written alongside the wiring it verifies. Surface-presence
is the floor that makes de-scope impossible; runtime is the ceiling each closure
raises, and the gap between them is named here, not hidden.

`partial` (◑) is a real state: Axum declares `Transport::Websocket` in the IR
but routes no handler; mizan-ts decodes a JWT but mints none. It renders ◑ — and
the conformance suite still treats it as RED, because the suite asserts
`state == "pass"`. ◑ is visible honesty, never a shippable-green hiding place.
"""

from __future__ import annotations

import re
from dataclasses import dataclass
from functools import lru_cache
from pathlib import Path
from typing import Callable, Literal

from manifest import Adapter

REPO_ROOT = Path(__file__).resolve().parents[2]
BACKENDS = REPO_ROOT / "backends"
CORES = REPO_ROOT / "cores"

# Each adapter's own source root. Probes scoped "adapter" read only here.
ADAPTER_ROOTS: dict[str, Path] = {
    "django": BACKENDS / "mizan-django" / "src" / "mizan",
    "fastapi": BACKENDS / "mizan-fastapi" / "src" / "mizan_fastapi",
    "rust_axum": BACKENDS / "mizan-rust-axum" / "src",
    "tauri": BACKENDS / "mizan-tauri" / "src",
    "typescript": BACKENDS / "mizan-ts" / "src",
}

# The shared core each language's adapters ride. Probes scoped "backend" read
# the adapter root PLUS these — that is where core-provided AFI-common logic
# (token minting, KDL IR) actually lives.
CORE_ROOTS: dict[str, list[Path]] = {
    "python": [CORES / "mizan-python" / "src" / "mizan_core"],
    "rust": [CORES / "mizan-rust" / "src", CORES / "mizan-rust-macros" / "src"],
    "typescript": [],  # mizan-ts is self-contained; no shared core
}

_SOURCE_EXTS = {".py", ".rs", ".ts", ".tsx"}
_SKIP_DIRS = {"node_modules", "target", "__pycache__", "dist", ".venv"}


State = Literal["pass", "partial", "fail"]


@dataclass(frozen=True)
class ProbeResult:
    state: State
    detail: str


# ─── Source collection + comment stripping ────────────────────────────────────


def _strip_comments(text: str, language: str) -> str:
    """Remove comments so prose can't satisfy a code-artifact pattern.

    Imperfect by design (a `#` inside a string may be clipped); the patterns are
    code identifiers that live outside strings, and the cost of a rare false
    strip is far below the cost of a comment-driven false `pass`.
    """
    if language in ("rust", "typescript"):
        text = re.sub(r"/\*.*?\*/", "", text, flags=re.DOTALL)   # block /* */ (incl. /** */)
        text = re.sub(r"(?<!:)//[^\n]*", "", text)               # line // (keep URL `://`)
    elif language == "python":
        text = re.sub(r'""".*?"""', "", text, flags=re.DOTALL)   # triple-quoted
        text = re.sub(r"'''.*?'''", "", text, flags=re.DOTALL)
        text = re.sub(r"#[^\n]*", "", text)                      # line #
    return text


def _read_roots(roots: tuple[Path, ...], language: str) -> str:
    chunks: list[str] = []
    for root in roots:
        if not root.exists():
            continue
        for path in sorted(root.rglob("*")):
            if not (path.is_file() and path.suffix in _SOURCE_EXTS):
                continue
            if any(part in _SKIP_DIRS for part in path.parts):
                continue
            chunks.append(_strip_comments(path.read_text(encoding="utf-8", errors="replace"), language))
    return "\n".join(chunks)


@lru_cache(maxsize=None)
def _adapter_text(adapter_id: str, language: str) -> str:
    return _read_roots((ADAPTER_ROOTS[adapter_id],), language)


@lru_cache(maxsize=None)
def _backend_text(adapter_id: str, language: str) -> str:
    roots = (ADAPTER_ROOTS[adapter_id], *CORE_ROOTS.get(language, []))
    return _read_roots(tuple(roots), language)


def _adapter(a: Adapter) -> str:
    return _adapter_text(a.id, a.language)


def _backend(a: Adapter) -> str:
    return _backend_text(a.id, a.language)


def _has_path(adapter_id: str, *relparts: str) -> bool:
    return ADAPTER_ROOTS[adapter_id].joinpath(*relparts).exists()


def _hit(text: str, pattern: str) -> bool:
    return re.search(pattern, text) is not None


def _wired(found: bool, what: str) -> ProbeResult:
    return ProbeResult("pass", f"wired: {what}") if found else ProbeResult("fail", f"missing: {what}")


# ─── Per-capability detection ─────────────────────────────────────────────────
#
# Patterns are grounded in artifacts read directly from each adapter:
#   django   urls.py `path("call/", ...)`, channels/ ssr/ shapes/ forms/ dirs
#   fastapi  router.py `@router.post("/call/")`, header insert, /session/
#   axum     handlers.rs `function_call`, `compute_invalidation`, no header/cache
#   tauri    lib.rs `mizan_invoke`, Envelope::Call/Fetch, no auth/cache/ws
#   ts       dispatch.ts `handleMutationCall`, checkAuth, token.ts decode-only


def _probe_rpc_call(a: Adapter) -> ProbeResult:
    pat = {
        "python": r'path\("call/|/call/|function_call',
        "rust": r"function_call|mizan_invoke|Envelope::Call",
        "typescript": r"handleMutationCall",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "RPC call dispatch")


def _probe_context_bundle(a: Adapter) -> ProbeResult:
    pat = {
        "python": r"context_fetch|/ctx/|ctx/<",
        "rust": r"context_fetch|handle_fetch|Envelope::Fetch",
        "typescript": r"handleContextFetch",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "named-context bundle fetch")


def _probe_invalidate_body(a: Adapter) -> ProbeResult:
    pat = {
        "python": r'"invalidate"|invalidate=|\binvalidate\b',
        "rust": r"invalidate|InvalidationTarget",
        "typescript": r"\.invalidate\b|invalidate:",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "`invalidate` key in response body")


def _probe_invalidate_header(a: Adapter) -> ProbeResult:
    return _wired(_hit(_adapter(a), r"X-Mizan-Invalidate"), "`X-Mizan-Invalidate` header emission")


def _probe_invalidate_autoscope(a: Adapter) -> ProbeResult:
    # The adapter wires auto-scoping by routing through the shared resolver.
    pat = {
        "python": r"resolve_invalidation|dispatch_call|dispatch_context",
        "rust": r"compute_invalidation",
        "typescript": r"resolveInvalidation",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "three-tier invalidation auto-scoping (shared resolver)")


def _probe_registration(a: Adapter) -> ProbeResult:
    pat = {
        "python": r"\bregister\b|get_function|registry",
        "rust": r"FUNCTIONS|lookup_function|linkme",
        "typescript": r"getFunction|\bregister\b|registry",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "function discovery / registration")


def _probe_ir_export(a: Adapter) -> ProbeResult:
    # Core-provided: python build_ir/export cmd (adapter), rust kdl.rs/ir.rs (core).
    if a.language == "python":
        return _wired(_hit(_adapter(a), r"build_ir|export_mizan_ir"), "KDL IR export")
    if a.language == "rust":
        return _wired(_hit(_backend(a), r"to_kdl|emit_kdl|fn build_ir|kdl::"), "KDL IR export (rust core)")
    # TypeScript: emits the edge manifest (JSON), but no codegen KDL IR (note 8).
    if _hit(_adapter(a), r"to_kdl|emitKdl|buildIr|\bkdl\b"):
        return ProbeResult("pass", "wired: KDL IR emitter")
    return ProbeResult("fail", "missing: KDL IR emitter (manifest.ts emits edge JSON, not codegen IR)")


def _probe_upload(a: Adapter) -> ProbeResult:
    pat = {
        "python": r"bind_uploads|UploadedFile|multipart",
        "rust": r"Multipart|multipart|bind_uploads",
        "typescript": r"FormData|multipart",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "multipart / Upload-type dispatch binding")


def _probe_auth_enforcement(a: Adapter) -> ProbeResult:
    if a.language == "python":
        return _wired(_hit(_adapter(a), r"enforce_auth|authenticate\(|authguard"), "auth= enforcement")
    if a.language == "typescript":
        return _wired(_hit(_adapter(a), r"checkAuth|authDenial|AuthDenial"), "auth= enforcement")
    # Rust adapters (axum, tauri): dispatch must reject on auth=.
    if _hit(_adapter(a), r"Unauthorized|Forbidden|enforce_auth"):
        return ProbeResult("pass", "wired: auth enforcement in dispatch")
    if _hit(_backend(a), r"\bauth\b|is_private|\bprivate\b"):
        return ProbeResult("partial", "auth/private carried in FunctionSpec; dispatch does not reject")
    return ProbeResult("fail", "missing: auth= enforcement")


def _probe_origin_cache(a: Adapter) -> ProbeResult:
    pat = {
        "python": r"CacheOrchestrator|derive_cache_key|cfg\.cache|cache_get|cache_put",
        "rust": r"derive_cache_key|CacheBackend|origin_cache",
        "typescript": r"cacheGet|cachePut|deriveCacheKey",
    }[a.language]
    return _wired(_hit(_backend(a), pat), "origin-side HMAC cache")


def _probe_edge_manifest(a: Adapter) -> ProbeResult:
    pat = {
        "python": r"export_edge_manifest|generate_edge_manifest|edge_manifest",
        "rust": r"edge_manifest|generate_manifest",
        "typescript": r"generateManifest|EdgeManifest",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "edge manifest export")


def _probe_psr(a: Adapter) -> ProbeResult:
    return _wired(_hit(_adapter(a), r"render_strategy|renderStrategy"), "PSR render_strategy")


def _probe_session_init(a: Adapter) -> ProbeResult:
    pat = {
        "python": r"session/|session_init",
        "rust": r"session_init|/session/",
        "typescript": r"sessionInit|/session/",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "session / CSRF init endpoint")


def _probe_websocket(a: Adapter) -> ProbeResult:
    if a.id == "django":
        return _wired(_has_path(a.id, "channels"), "Django Channels consumer")
    if a.id == "fastapi":
        return _wired(_hit(_adapter(a), r"WebSocket|@router\.websocket|websocket_route"), "FastAPI WebSocket route")
    if a.id == "rust_axum":
        if _hit(_adapter(a), r"WebSocketUpgrade|on_upgrade|ws_handler"):
            return ProbeResult("pass", "wired: Axum WebSocket handler")
        if _hit(_backend(a), r"Websocket|WebSocket"):
            return ProbeResult("partial", "Transport::Websocket declared in IR; no Axum handler routed")
        return ProbeResult("fail", "missing: WebSocket transport")
    if a.id == "tauri":
        return _wired(_hit(_adapter(a), r"subscription|Subscribe|emit_to|Channel<"), "IPC subscription channel")
    return _wired(_hit(_adapter(a), r"WebSocket|websocket"), "WebSocket transport")


def _probe_ssr_bridge(a: Adapter) -> ProbeResult:
    if a.id == "django":
        return _wired(_has_path(a.id, "ssr", "bridge.py"), "Bun SSR subprocess bridge")
    return _wired(_hit(_adapter(a), r"SSRBridge|renderToString|ssr_bridge"), "SSR bridge (subprocess renderer)")


def _probe_jwt(a: Adapter) -> ProbeResult:
    # Core-provided for Python (mizan_core.auth); TS has decode-only helpers.
    if a.language == "python":
        return _wired(_hit(_backend(a), r"\bjwt\b|JWT|def authenticate"), "JWT auth (rides mizan_core.auth)")
    if a.id == "typescript":
        if _hit(_adapter(a), r"signJwt|mintJwt|createJwt|encodeJwt"):
            return ProbeResult("pass", "wired: JWT mint + verify")
        if _hit(_adapter(a), r"decodeJwt|decodeJwtBearer"):
            return ProbeResult("partial", "decode-only helper; mints no tokens")
        return ProbeResult("fail", "missing: JWT auth")
    return _wired(_hit(_backend(a), r"\bjwt\b|JWT"), "JWT auth (access / refresh)")


def _probe_mwt(a: Adapter) -> ProbeResult:
    if a.language == "python":
        return _wired(_hit(_backend(a), r"\bmwt\b|MWT|X-Mizan-Token"), "MWT (edge identity token)")
    if a.id == "typescript":
        if _hit(_adapter(a), r"signMwt|mintMwt|createMwt"):
            return ProbeResult("pass", "wired: MWT mint")
        if _hit(_adapter(a), r"decodeMwt|identityFromMwt"):
            return ProbeResult("partial", "decode-only helper; mints no tokens")
        return ProbeResult("fail", "missing: MWT")
    return _wired(_hit(_backend(a), r"\bmwt\b|MWT"), "MWT (edge identity token)")


def _probe_shapes(a: Adapter) -> ProbeResult:
    if a.id == "django":
        return _wired(_has_path(a.id, "shapes"), "django-readers Shapes binding")
    pat = {
        "python": r"django_readers|QuerysetProjection|shapes\.",
        "rust": r"shapes::|QueryProjection",
        "typescript": r"QueryProjection|shapesBinding",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "typed query-projection binding")


def _probe_forms(a: Adapter) -> ProbeResult:
    if a.id == "django":
        return _wired(_has_path(a.id, "forms"), "Django Forms binding (schema / validate / submit)")
    if a.language == "rust":
        if _hit(_adapter(a), r"form_submit|form_validate|FormRole::Submit"):
            return ProbeResult("pass", "wired: form validate/submit endpoint")
        if _hit(_backend(a), r"is_form|form_role|FormRole"):
            return ProbeResult("partial", "is_form/form_role carried; no validate/submit endpoint")
        return ProbeResult("fail", "missing: forms")
    pat = {
        "python": r"FormSchema|form_role|forms\.",
        "typescript": r"FormSchema|formRole|formSubmit",
    }[a.language]
    return _wired(_hit(_adapter(a), pat), "forms (schema / validate / submit)")


PROBES: dict[str, Callable[[Adapter], ProbeResult]] = {
    "rpc_call": _probe_rpc_call,
    "context_bundle": _probe_context_bundle,
    "invalidate_body": _probe_invalidate_body,
    "invalidate_header": _probe_invalidate_header,
    "invalidate_autoscope": _probe_invalidate_autoscope,
    "registration": _probe_registration,
    "ir_export": _probe_ir_export,
    "upload": _probe_upload,
    "auth_enforcement": _probe_auth_enforcement,
    "origin_cache": _probe_origin_cache,
    "edge_manifest": _probe_edge_manifest,
    "psr": _probe_psr,
    "session_init": _probe_session_init,
    "websocket": _probe_websocket,
    "ssr_bridge": _probe_ssr_bridge,
    "jwt": _probe_jwt,
    "mwt": _probe_mwt,
    "shapes": _probe_shapes,
    "forms": _probe_forms,
}


def run_probe(capability_id: str, adapter: Adapter) -> ProbeResult:
    """Run the probe for one (capability, adapter) pair."""
    probe = PROBES.get(capability_id)
    if probe is None:
        raise KeyError(
            f"No probe registered for capability '{capability_id}'. Every capability "
            f"in manifest.CAPABILITIES owes a probe — add one to PROBES."
        )
    return probe(adapter)