"""
AI Agent result capture owner acceptance maintenance gate snapshot.

Loads the latest committed P2-127 owner acceptance / maintenance gate package.
This module validates committed evidence only; it never applies writers, executes
live applies, writes receipts, writes result captures, writes learning records,
updates PlayBook trust, writes reviewer / Gateway queues, sends Telegram
messages, reads canonical runtime targets, reads secrets, or performs
destructive operations.
"""

from __future__ import annotations

import json
from pathlib import Path
from typing import Any

from src.services.snapshot_paths import default_evaluations_dir

_DEFAULT_EVALUATIONS_DIR = default_evaluations_dir(Path(__file__))
_SNAPSHOT_PATTERN = "ai_agent_result_capture_owner_acceptance_maintenance_gate_*.json"
_SCHEMA_VERSION = "ai_agent_result_capture_owner_acceptance_maintenance_gate_v1"
_RUNTIME_AUTHORITY = "result_capture_owner_acceptance_maintenance_gate_only_no_live_write"


def load_latest_ai_agent_result_capture_owner_acceptance_maintenance_gate(
    evaluations_dir: Path | None = None,
) -> dict[str, Any]:
    """Load the newest committed owner acceptance / maintenance gate package."""
    directory = evaluations_dir or _DEFAULT_EVALUATIONS_DIR
    candidates = sorted(directory.glob(_SNAPSHOT_PATTERN))
    if not candidates:
        raise FileNotFoundError(f"no AI Agent result capture owner acceptance maintenance gate snapshots found in {directory}")

    latest = candidates[-1]
    with latest.open(encoding="utf-8") as handle:
        payload = json.load(handle)

    if not isinstance(payload, dict):
        raise ValueError(f"{latest}: expected JSON object")

    label = str(latest)
    _require_schema(payload, label)
    _require_prior(payload, label)
    _require_truth(payload, label)
    _require_acceptance_packets(payload, label)
    _require_maintenance_windows(payload, label)
    _require_rollback_owner_checks(payload, label)
    _require_post_apply_verifier_gates(payload, label)
    _require_blocked_live_writes(payload, label)
    _require_actions(payload, label)
    _require_display_redaction(payload, label)
    _require_no_forbidden_display_terms(payload, label)
    _require_rollup_consistency(payload, label)
    return payload


def _require_schema(payload: dict[str, Any], label: str) -> None:
    if payload.get("schema_version") != _SCHEMA_VERSION:
        raise ValueError(f"{label}: expected schema_version={_SCHEMA_VERSION}")
    status = payload.get("program_status") or {}
    expected = {
        "current_priority": "P2",
        "current_task_id": "P2-127",
        "next_task_id": "P2-128",
        "read_only_mode": True,
        "runtime_authority": _RUNTIME_AUTHORITY,
        "overall_completion_percent": 100,
    }
    mismatches = _mismatches(status, expected)
    if mismatches:
        raise ValueError(f"{label}: program_status mismatch: {mismatches}")
    if not status.get("status_note"):
        raise ValueError(f"{label}: program_status.status_note is required")


def _require_prior(payload: dict[str, Any], label: str) -> None:
    prior = payload.get("prior_owner_approved_execution_rehearsal") or {}
    expected = {
        "schema_version": "ai_agent_result_capture_owner_approved_execution_rehearsal_v1",
        "execution_rehearsal_count": 5,
        "no_write_apply_check_count": 5,
        "post_write_verifier_rehearsal_count": 5,
        "rollback_drill_count": 5,
        "blocked_live_apply_count": 6,
        "operator_action_count": 5,
        "approval_required_total": 8,
        "blocked_total": 9,
        "owner_approval_record_received_count": 0,
        "no_write_apply_execution_count": 0,
        "post_write_verifier_pass_count": 0,
        "rollback_drill_confirmed_count": 0,
        "writer_apply_count": 0,
        "execution_apply_count": 0,
        "receipt_write_count": 0,
        "result_capture_write_count": 0,
        "learning_write_count": 0,
        "playbook_trust_write_count": 0,
        "reviewer_queue_write_count": 0,
        "gateway_queue_write_count": 0,
        "telegram_send_count": 0,
        "bot_api_call_count": 0,
        "report_receipt_write_count": 0,
    }
    mismatches = _mismatches(prior, expected)
    if mismatches:
        raise ValueError(f"{label}: prior_owner_approved_execution_rehearsal mismatch: {mismatches}")
    if not prior.get("readiness_note"):
        raise ValueError(f"{label}: prior_owner_approved_execution_rehearsal.readiness_note is required")


def _require_truth(payload: dict[str, Any], label: str) -> None:
    truth = payload.get("owner_acceptance_truth") or {}
    required_true = {
        "p2_126_execution_rehearsal_loaded",
        "owner_acceptance_packet_ready",
        "maintenance_window_required",
        "rollback_owner_required",
        "post_apply_verifier_required",
        "redaction_review_required",
        "live_apply_gate_closed",
        "acceptance_gate_only",
    }
    missing = sorted(field for field in required_true if truth.get(field) is not True)
    if missing:
        raise ValueError(f"{label}: owner acceptance ready flags must remain true: {missing}")
    required_false = {
        "owner_acceptance_received",
        "maintenance_window_approved",
        "rollback_owner_confirmed",
        "post_apply_verifier_ready",
        "writer_apply_enabled",
        "execution_apply_enabled",
        "receipt_write_enabled",
        "reviewer_queue_write_enabled",
        "gateway_queue_write_enabled",
        "telegram_send_enabled",
        "bot_api_call_enabled",
        "report_receipt_write_enabled",
        "result_capture_write_enabled",
        "learning_write_enabled",
        "playbook_trust_write_enabled",
        "production_write_enabled",
        "secret_read_enabled",
        "destructive_operation_enabled",
    }
    unsafe = sorted(field for field in required_false if truth.get(field) is not False)
    if unsafe:
        raise ValueError(f"{label}: live execution/send/write flags must remain false: {unsafe}")
    zero_counts = {
        "owner_acceptance_received_count",
        "maintenance_window_approved_count",
        "rollback_owner_confirmed_count",
        "post_apply_verifier_ready_count",
        "writer_apply_count",
        "execution_apply_count",
        "receipt_write_count",
        "reviewer_queue_write_count",
        "gateway_queue_write_count",
        "telegram_send_count",
        "bot_api_call_count",
        "report_receipt_write_count",
        "result_capture_write_count",
        "learning_write_count",
        "playbook_trust_write_count",
        "production_write_count",
        "secret_read_count",
        "destructive_operation_count",
    }
    non_zero = sorted(field for field in zero_counts if truth.get(field) != 0)
    if non_zero:
        raise ValueError(f"{label}: owner acceptance live counters must remain zero: {non_zero}")
    if not truth.get("truth_note"):
        raise ValueError(f"{label}: owner_acceptance_truth.truth_note is required")


def _require_acceptance_packets(payload: dict[str, Any], label: str) -> None:
    items = payload.get("owner_acceptance_packets") or []
    required = {
        "acceptance_result_capture_writer",
        "acceptance_learning_writer",
        "acceptance_playbook_trust_writer",
        "acceptance_reviewer_queue_writer",
        "acceptance_gateway_queue_writer",
    }
    ids = {item.get("packet_id") for item in items}
    if ids != required:
        raise ValueError(f"{label}: owner acceptance packets must match {sorted(required)}")
    for item in items:
        item_id = item.get("packet_id")
        if item.get("packet_mode") != "owner_acceptance_required":
            raise ValueError(f"{label}: packet {item_id} must remain owner acceptance required")
        if item.get("owner_acceptance_required") is not True or item.get("owner_accepted") is not False:
            raise ValueError(f"{label}: packet {item_id} must not mark owner accepted")
        if item.get("status") not in {"ready_for_owner_review", "approval_required", "blocked_by_policy"}:
            raise ValueError(f"{label}: packet {item_id} status is invalid")
        if not item.get("required_evidence") or not _is_redacted_sha256(item.get("evidence_hash")):
            raise ValueError(f"{label}: packet {item_id} must include required evidence and redacted hash")


def _require_maintenance_windows(payload: dict[str, Any], label: str) -> None:
    items = payload.get("maintenance_windows") or []
    required = {
        "window_result_capture_writer",
        "window_learning_writer",
        "window_playbook_trust_writer",
        "window_reviewer_queue_writer",
        "window_gateway_queue_writer",
    }
    ids = {item.get("window_id") for item in items}
    if ids != required:
        raise ValueError(f"{label}: maintenance windows must match {sorted(required)}")
    for item in items:
        item_id = item.get("window_id")
        if item.get("window_mode") != "maintenance_window_draft":
            raise ValueError(f"{label}: window {item_id} must remain maintenance window draft")
        if item.get("maintenance_window_required") is not True or item.get("window_approved") is not False:
            raise ValueError(f"{label}: window {item_id} must not be approved")
        if item.get("status") not in {"ready_for_owner_review", "approval_required", "blocked_by_policy"}:
            raise ValueError(f"{label}: window {item_id} status is invalid")
        if not item.get("blackout_policy") or not item.get("validation_plan"):
            raise ValueError(f"{label}: window {item_id} blackout_policy and validation_plan are required")


def _require_rollback_owner_checks(payload: dict[str, Any], label: str) -> None:
    items = payload.get("rollback_owner_checks") or []
    required = {
        "rollback_owner_result_capture",
        "rollback_owner_learning",
        "rollback_owner_playbook_trust",
        "rollback_owner_reviewer_queue",
        "rollback_owner_gateway_queue",
    }
    ids = {item.get("check_id") for item in items}
    if ids != required:
        raise ValueError(f"{label}: rollback owner checks must match {sorted(required)}")
    for item in items:
        item_id = item.get("check_id")
        if item.get("rollback_owner_required") is not True or item.get("rollback_owner_confirmed") is not False:
            raise ValueError(f"{label}: rollback owner check {item_id} must remain unconfirmed")
        if item.get("status") not in {"ready_for_owner_review", "approval_required", "blocked_by_policy"}:
            raise ValueError(f"{label}: rollback owner check {item_id} status is invalid")
        if not item.get("rollback_scope") or not item.get("failure_if_missing"):
            raise ValueError(f"{label}: rollback owner check {item_id} scope and failure_if_missing are required")


def _require_post_apply_verifier_gates(payload: dict[str, Any], label: str) -> None:
    items = payload.get("post_apply_verifier_gates") or []
    required = {
        "verifier_gate_result_capture",
        "verifier_gate_learning",
        "verifier_gate_playbook_trust",
        "verifier_gate_reviewer_queue",
        "verifier_gate_gateway_queue",
    }
    ids = {item.get("gate_id") for item in items}
    if ids != required:
        raise ValueError(f"{label}: post-apply verifier gates must match {sorted(required)}")
    for item in items:
        item_id = item.get("gate_id")
        if item.get("gate_mode") != "post_apply_verifier_gate":
            raise ValueError(f"{label}: verifier gate {item_id} must remain post-apply verifier gate")
        if item.get("verifier_ready") is not False or item.get("live_read_enabled") is not False:
            raise ValueError(f"{label}: verifier gate {item_id} must not enable live read")
        if item.get("status") not in {"ready_for_owner_review", "approval_required", "blocked_by_policy"}:
            raise ValueError(f"{label}: verifier gate {item_id} status is invalid")
        if not item.get("expected_signal"):
            raise ValueError(f"{label}: verifier gate {item_id} expected_signal is required")


def _require_blocked_live_writes(payload: dict[str, Any], label: str) -> None:
    items = payload.get("blocked_live_writes") or []
    required = {
        "blocked_writer_apply",
        "blocked_execution_apply",
        "blocked_receipt_write",
        "blocked_result_capture_write",
        "blocked_gateway_queue_write",
        "blocked_telegram_send",
    }
    ids = {item.get("blocker_id") for item in items}
    if ids != required:
        raise ValueError(f"{label}: blocked live writes must match {sorted(required)}")
    for item in items:
        item_id = item.get("blocker_id")
        if item.get("status") not in {"approval_required", "blocked_by_policy"}:
            raise ValueError(f"{label}: blocker {item_id} status is invalid")
        if item.get("severity") not in {"high", "critical"}:
            raise ValueError(f"{label}: blocker {item_id} severity is invalid")
        if not item.get("blocked_action") or not item.get("blocked_until"):
            raise ValueError(f"{label}: blocker {item_id} must include blocked_action and blocked_until")
        if not _is_redacted_sha256(item.get("evidence_hash")):
            raise ValueError(f"{label}: blocker {item_id} must expose redacted evidence_hash")


def _require_actions(payload: dict[str, Any], label: str) -> None:
    actions = payload.get("operator_actions") or []
    required = {
        "review_owner_acceptance_packets",
        "confirm_maintenance_windows",
        "confirm_rollback_owners",
        "verify_post_apply_gates",
        "hold_live_apply_gate",
    }
    ids = {action.get("action_id") for action in actions}
    if ids != required:
        raise ValueError(f"{label}: operator actions must match {sorted(required)}")
    for action in actions:
        action_id = action.get("action_id")
        if action.get("runtime_write_allowed") is not False:
            raise ValueError(f"{label}: action {action_id} must not allow runtime write")
        if not action.get("operator_instruction"):
            raise ValueError(f"{label}: action {action_id} operator_instruction is required")


def _require_display_redaction(payload: dict[str, Any], label: str) -> None:
    contract = payload.get("display_redaction_contract") or {}
    expected = {
        "redaction_required": True,
        "raw_prompt_display_allowed": False,
        "private_reasoning_display_allowed": False,
        "secret_value_display_allowed": False,
        "raw_runtime_payload_display_allowed": False,
        "internal_collaboration_content_display_allowed": False,
    }
    mismatches = _mismatches(contract, expected)
    if mismatches:
        raise ValueError(f"{label}: display_redaction_contract mismatch: {mismatches}")
    if not contract.get("frontend_display_policy"):
        raise ValueError(f"{label}: display_redaction_contract.frontend_display_policy is required")


def _require_rollup_consistency(payload: dict[str, Any], label: str) -> None:
    rollups = payload.get("rollups") or {}
    packets = payload.get("owner_acceptance_packets") or []
    windows = payload.get("maintenance_windows") or []
    rollbacks = payload.get("rollback_owner_checks") or []
    verifiers = payload.get("post_apply_verifier_gates") or []
    blockers = payload.get("blocked_live_writes") or []
    actions = payload.get("operator_actions") or []
    expected = {
        "owner_acceptance_packet_count": len(packets),
        "maintenance_window_count": len(windows),
        "rollback_owner_check_count": len(rollbacks),
        "post_apply_verifier_gate_count": len(verifiers),
        "blocked_live_write_count": len(blockers),
        "operator_action_count": len(actions),
        "approval_required_packet_count": sum(1 for item in packets if item.get("status") == "approval_required"),
        "blocked_packet_count": sum(1 for item in packets if item.get("status") == "blocked_by_policy"),
        "approval_required_window_count": sum(1 for item in windows if item.get("status") == "approval_required"),
        "blocked_window_count": sum(1 for item in windows if item.get("status") == "blocked_by_policy"),
        "approval_required_rollback_count": sum(1 for item in rollbacks if item.get("status") == "approval_required"),
        "blocked_rollback_count": sum(1 for item in rollbacks if item.get("status") == "blocked_by_policy"),
        "approval_required_verifier_count": sum(1 for item in verifiers if item.get("status") == "approval_required"),
        "blocked_verifier_count": sum(1 for item in verifiers if item.get("status") == "blocked_by_policy"),
        "critical_blocker_count": sum(1 for item in blockers if item.get("severity") == "critical"),
        "owner_acceptance_received_count": 0,
        "maintenance_window_approved_count": 0,
        "rollback_owner_confirmed_count": 0,
        "post_apply_verifier_ready_count": 0,
        "writer_apply_count": 0,
        "execution_apply_count": 0,
        "receipt_write_count": 0,
        "reviewer_queue_write_count": 0,
        "gateway_queue_write_count": 0,
        "telegram_send_count": 0,
        "bot_api_call_count": 0,
        "report_receipt_write_count": 0,
        "result_capture_write_count": 0,
        "learning_write_count": 0,
        "playbook_trust_write_count": 0,
        "production_write_count": 0,
        "secret_read_count": 0,
        "destructive_operation_count": 0,
    }
    mismatches = _mismatches(rollups, expected)
    if mismatches:
        raise ValueError(f"{label}: rollup counts mismatch: {mismatches}")


def _require_no_forbidden_display_terms(payload: dict[str, Any], label: str) -> None:
    serialized = json.dumps(payload, ensure_ascii=False)
    forbidden = {
        "work_window_transcript",
        "session_id",
        "browser_context",
        "authorization_header",
        "raw Telegram payload",
        "private reasoning",
        "raw prompt",
        "chain-of-thought",
    }
    hits = sorted(term for term in forbidden if term in serialized)
    if hits:
        raise ValueError(f"{label}: forbidden display terms present: {hits}")


def _is_redacted_sha256(value: Any) -> bool:
    if not isinstance(value, str) or not value.startswith("sha256:"):
        return False
    digest = value.removeprefix("sha256:")
    return len(digest) == 64 and all(char in "0123456789abcdef" for char in digest)


def _mismatches(payload: dict[str, Any], expected: dict[str, Any]) -> dict[str, dict[str, Any]]:
    return {
        key: {"expected": value, "actual": payload.get(key)}
        for key, value in expected.items()
        if payload.get(key) != value
    }
