"""
AI Agent result capture release decision readback snapshot.

Loads the latest committed P2-139 release decision readback. This module only
reads committed evidence from P2-138 release decision hold; it never treats a
hold as a passed decision, grants release authorization, writes reviewer /
Gateway queues, sends Telegram messages, writes result capture, writes learning
records, updates PlayBook trust, reads secrets, writes production targets, or
performs destructive operations.
"""

from __future__ import annotations

import json
import re
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_release_decision_readback_*.json"
_SCHEMA_VERSION = "ai_agent_result_capture_release_decision_readback_v1"
_RUNTIME_AUTHORITY = "result_capture_release_decision_readback_only_no_live_write"


def load_latest_ai_agent_result_capture_release_decision_readback(
    evaluations_dir: Path | None = None,
) -> dict[str, Any]:
    """Load the newest committed release decision readback."""
    directory = evaluations_dir or _DEFAULT_EVALUATIONS_DIR
    candidates = sorted(directory.glob(_SNAPSHOT_PATTERN))
    if not candidates:
        raise FileNotFoundError(f"no AI Agent result capture release decision readback 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_readback_groups(payload, label)
    _require_blocked_transitions(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": "P2-139",
        "next_task_id": "P2-140",
        "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_release_decision_hold") or {}
    expected = {
        "schema_version": "ai_agent_result_capture_release_decision_hold_v1",
        "release_decision_hold_count": 5,
        "owner_decision_hold_count": 5,
        "verifier_decision_hold_count": 5,
        "rollback_decision_hold_count": 5,
        "maintenance_window_decision_hold_count": 5,
        "live_apply_decision_hold_count": 5,
        "blocked_decision_transition_count": 6,
        "operator_action_count": 5,
        "approval_required_total": 12,
        "blocked_total": 12,
    }
    expected.update(_zero_count_expectations())
    mismatches = _mismatches(prior, expected)
    if mismatches:
        raise ValueError(f"{label}: prior_release_decision_hold mismatch: {mismatches}")
    if not prior.get("readiness_note"):
        raise ValueError(f"{label}: prior_release_decision_hold.readiness_note is required")


def _require_truth(payload: dict[str, Any], label: str) -> None:
    truth = payload.get("release_decision_readback_truth") or {}
    required_true = {
        "p2_138_release_decision_hold_loaded",
        "release_decision_readback_ready",
        "owner_decision_still_required",
        "verifier_decision_still_required",
        "rollback_decision_still_required",
        "maintenance_window_decision_still_required",
        "live_apply_decision_still_required",
        "redaction_review_still_required",
        "release_decision_readback_only",
    }
    missing = sorted(field for field in required_true if truth.get(field) is not True)
    if missing:
        raise ValueError(f"{label}: release decision readback flags must remain true: {missing}")

    required_false = {
        "owner_release_authorized",
        "owner_release_approved",
        "owner_review_approved",
        "owner_decision_approved",
        "verifier_decision_approved",
        "maintenance_window_approved",
        "rollback_owner_confirmed",
        "post_release_verifier_ready",
        "final_release_candidate_approved",
        "final_release_candidate_passed",
        "release_decision_passed",
        "release_authorization_granted",
        "release_authorization_passed",
        "rollback_release_passed",
        "live_apply_release_passed",
        "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}: release decision readback live/send/write flags must remain false: {unsafe}")

    non_zero = sorted(field for field in _zero_count_expectations() if truth.get(field) != 0)
    if non_zero:
        raise ValueError(f"{label}: release decision readback live counters must remain zero: {non_zero}")
    if not truth.get("truth_note"):
        raise ValueError(f"{label}: release_decision_readback_truth.truth_note is required")


def _require_readback_groups(payload: dict[str, Any], label: str) -> None:
    groups = {
        "release_decision_readbacks": ("readback_id", "release_decision_readback", "release decision readbacks"),
        "owner_decision_readbacks": ("readback_id", "owner_decision_readback", "owner decision readbacks"),
        "verifier_decision_readbacks": ("readback_id", "verifier_decision_readback", "verifier decision readbacks"),
        "rollback_decision_readbacks": ("readback_id", "rollback_decision_readback", "rollback decision readbacks"),
        "maintenance_window_decision_readbacks": ("readback_id", "maintenance_window_decision_readback", "maintenance window decision readbacks"),
        "live_apply_decision_readbacks": ("readback_id", "live_apply_decision_readback", "live apply decision readbacks"),
    }
    for field, (id_field, mode, group_name) in groups.items():
        items = payload.get(field) or []
        _require_ids(items, id_field, _expected_ids(mode), label, group_name)
        for item in items:
            item_id = item.get(id_field)
            if item.get("readback_mode") != mode:
                raise ValueError(f"{label}: {group_name} {item_id} mode is invalid")
            if item.get("readback_status") not in {"readback_complete", "approval_required", "blocked_by_policy"}:
                raise ValueError(f"{label}: {group_name} {item_id} readback_status is invalid")
            if not item.get("readback_summary"):
                raise ValueError(f"{label}: {group_name} {item_id}.readback_summary is required")
            if item.get("release_decision_passed") is not False:
                raise ValueError(f"{label}: {group_name} {item_id} must keep release_decision_passed=false")
            if item.get("release_authorization_granted") is not False:
                raise ValueError(f"{label}: {group_name} {item_id} must keep release_authorization_granted=false")
            if item.get("runtime_write_allowed") is not False:
                raise ValueError(f"{label}: {group_name} {item_id} must keep runtime_write_allowed=false")
            if item.get("telegram_send_allowed") is not False:
                raise ValueError(f"{label}: {group_name} {item_id} must keep telegram_send_allowed=false")
            if "evidence_hash" in item and not _is_redacted_sha256(item.get("evidence_hash")):
                raise ValueError(f"{label}: {group_name} {item_id}.evidence_hash must be redacted sha256")


def _require_blocked_transitions(payload: dict[str, Any], label: str) -> None:
    items = payload.get("blocked_readback_transitions") or []
    _require_count(items, 6, label, "blocked readback transitions")
    for item in items:
        item_id = item.get("transition_id")
        if item.get("runtime_write_allowed") is not False:
            raise ValueError(f"{label}: blocked readback transition {item_id} must keep runtime_write_allowed=false")
        if item.get("status") not in {"blocked_by_policy", "approval_required"}:
            raise ValueError(f"{label}: blocked readback transition {item_id} status is invalid")
        if not item.get("reason"):
            raise ValueError(f"{label}: blocked readback transition {item_id}.reason is required")


def _require_actions(payload: dict[str, Any], label: str) -> None:
    items = payload.get("operator_actions") or []
    _require_count(items, 5, label, "operator actions")
    for item in items:
        item_id = item.get("action_id")
        if item.get("runtime_write_allowed") is not False:
            raise ValueError(f"{label}: operator action {item_id} must keep runtime_write_allowed=false")
        if item.get("status") not in {"ready_for_operator_review", "approval_required"}:
            raise ValueError(f"{label}: operator action {item_id} status is invalid")
        if not item.get("operator_instruction"):
            raise ValueError(f"{label}: operator action {item_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 {}
    expected = {
        "release_decision_readback_count": len(payload.get("release_decision_readbacks") or []),
        "owner_decision_readback_count": len(payload.get("owner_decision_readbacks") or []),
        "verifier_decision_readback_count": len(payload.get("verifier_decision_readbacks") or []),
        "rollback_decision_readback_count": len(payload.get("rollback_decision_readbacks") or []),
        "maintenance_window_decision_readback_count": len(payload.get("maintenance_window_decision_readbacks") or []),
        "live_apply_decision_readback_count": len(payload.get("live_apply_decision_readbacks") or []),
        "blocked_readback_transition_count": len(payload.get("blocked_readback_transitions") or []),
        "operator_action_count": len(payload.get("operator_actions") or []),
    }
    expected.update(_zero_count_expectations())
    mismatches = _mismatches(rollups, expected)
    if mismatches:
        raise ValueError(f"{label}: rollups mismatch: {mismatches}")


def _require_no_forbidden_display_terms(payload: Any, label: str) -> None:
    forbidden = {
        "work_window_transcript",
        "internal_collaboration_transcript",
        "raw_prompt",
        "private_reasoning",
        "chain_of_thought",
        "authorization_header",
        "secret_value",
    }
    found = sorted(term for term in forbidden if _contains_term(payload, term))
    if found:
        raise ValueError(f"{label}: forbidden display terms leaked: {found}")


def _contains_term(value: Any, term: str) -> bool:
    if isinstance(value, str):
        return term.lower() in value.lower()
    if isinstance(value, dict):
        return any(_contains_term(child, term) for child in value.values())
    if isinstance(value, list):
        return any(_contains_term(child, term) for child in value)
    return False


def _zero_count_expectations() -> dict[str, int]:
    return {
        "owner_release_authorized_count": 0,
        "owner_release_approved_count": 0,
        "owner_review_approved_count": 0,
        "owner_decision_approved_count": 0,
        "verifier_decision_approved_count": 0,
        "maintenance_window_approved_count": 0,
        "rollback_owner_confirmed_count": 0,
        "post_release_verifier_ready_count": 0,
        "final_release_candidate_approved_count": 0,
        "final_release_candidate_pass_count": 0,
        "release_decision_pass_count": 0,
        "release_authorization_granted_count": 0,
        "release_authorization_pass_count": 0,
        "rollback_release_pass_count": 0,
        "live_apply_release_pass_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,
    }


def _expected_ids(mode: str) -> set[str]:
    return {
        f"{mode}_result_capture",
        f"{mode}_learning",
        f"{mode}_playbook_trust",
        f"{mode}_reviewer_queue",
        f"{mode}_gateway_queue",
    }


def _require_ids(
    items: list[dict[str, Any]],
    field: str,
    expected_ids: set[str],
    label: str,
    group_name: str,
) -> None:
    actual_ids = {str(item.get(field)) for item in items}
    if actual_ids != expected_ids:
        raise ValueError(f"{label}: {group_name} ids mismatch: expected={sorted(expected_ids)} actual={sorted(actual_ids)}")


def _require_count(items: list[Any], expected: int, label: str, group_name: str) -> None:
    if len(items) != expected:
        raise ValueError(f"{label}: expected {expected} {group_name}, got {len(items)}")


def _is_redacted_sha256(value: Any) -> bool:
    return isinstance(value, str) and re.fullmatch(r"sha256:[0-9a-f]{64}", value) is not None


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