"""Site-dict builders.

Builds one site object per instance: coverage (12 channels), normalized_signals
(primary inputs), and raw_features that are (i) schema-valid against
observables/observables.yaml and (ii) numerically consistent with the signals.
Raw-feature record shapes reuse the field names of
scripts/generate_synthetic_observables.py:512-751.
"""

from __future__ import annotations

import hashlib
import json
from datetime import datetime, timedelta, timezone
from typing import Any, Optional

PEAK_RATE = 2.0e15
SECONDS_PER_DAY = 86400.0
BASE_START = datetime(2026, 4, 1, tzinfo=timezone.utc)
POLICY_THRESHOLD = 1.0e25

# Good coverage profile (spec section 2 preamble).
GOOD_COVERAGE = {
    "capacity": 0.96,
    "activity": 0.94,
    "achieved_ops": 0.94,
    "fabric": 0.92,
    "storage": 0.92,
    "serving": 0.90,
    "storage_operations": 0.90,
    "benchmark_hpc": 0.90,
    "attribution": 0.92,
    "scope_mapping": 0.94,
    "identity_shape": 0.92,
    "clock_alignment": 0.93,
}

COVERAGE_CHANNELS = list(GOOD_COVERAGE)

# Raw feature ids that carry each coverage channel's telemetry (used by M3 null
# representation: dropping a channel = dropping coverage key + signals + raws).
RAW_BY_CHANNEL = {
    "activity": [
        "accelerator_busy_or_utilization_fraction",
        "tensor_matrix_mxu_neuron_or_engine_active_fraction",
    ],
    "achieved_ops": ["generic_achieved_operation_rate"],
    "fabric": ["fabric_port_device_sample_counters", "scaleout_port_tx_rx_bytes_packets"],
    "storage": ["storage_write_operation_bytes", "object_storage_operation_counts"],
    "serving": ["load_balancer_gateway_flow_activity", "north_south_external_egress"],
    "capacity": [],
    "scope_mapping": [],
    "clock_alignment": [],
}

SIGNALS_BY_CHANNEL = {
    "activity": ["activity_score"],
    "achieved_ops": ["achieved_operations"],
    "fabric": ["collective_cadence_score", "activity_fabric_overlap_fraction", "participant_count"],
    "storage": [
        "checkpoint_periodicity_score",
        "checkpoint_burst_count",
        "checkpoint_activity_adjacency_fraction",
    ],
    "serving": [
        "serving_counterevidence_score",
        "serving_activity_overlap_fraction",
        "non_serving_score",
    ],
    "capacity": [],
    "scope_mapping": [],
    "clock_alignment": [],
}


def iso(moment: datetime) -> str:
    return moment.strftime("%Y-%m-%dT%H:%M:%SZ")


def window_for(duration_seconds: float, start: datetime = BASE_START) -> dict:
    end = start + timedelta(seconds=int(round(duration_seconds)))
    return {"start": iso(start), "end": iso(end)}


def window_seconds(window: dict) -> float:
    start = datetime.strptime(window["start"], "%Y-%m-%dT%H:%M:%SZ")
    end = datetime.strptime(window["end"], "%Y-%m-%dT%H:%M:%SZ")
    return (end - start).total_seconds()


def coverage_profile(edits: Optional[dict] = None, omit: tuple = ()) -> dict:
    cov = dict(GOOD_COVERAGE)
    if edits:
        cov.update(edits)
    for key in omit:
        cov.pop(key, None)
    return cov


def param_hash(params: dict) -> str:
    return hashlib.sha1(json.dumps(params, sort_keys=True, default=str).encode("utf-8")).hexdigest()[:8]


def capacity_bound(count: int, duration_seconds: float, peak: float = PEAK_RATE) -> float:
    return count * peak * duration_seconds


def build_raw_features(
    audit_window: dict,
    *,
    count: int,
    peak: float,
    signals: dict,
    allocation: bool,
    storage_op_type: str,
    omit_raw: set,
) -> dict:
    """Raw features schema-valid against observables.yaml and numerically
    consistent with normalized_signals (the self-check asserts this)."""
    start = datetime.strptime(audit_window["start"], "%Y-%m-%dT%H:%M:%SZ").replace(tzinfo=timezone.utc)
    end = datetime.strptime(audit_window["end"], "%Y-%m-%dT%H:%M:%SZ").replace(tzinfo=timezone.utc)
    duration_seconds = (end - start).total_seconds()
    mid = start + (end - start) / 2

    activity = float(signals.get("activity_score", 0.0))
    achieved = float(signals.get("achieved_operations", 0.0))
    fabric = float(signals.get("collective_cadence_score", 0.0))
    participants = int(signals.get("participant_count", 0))
    checkpoint = float(signals.get("checkpoint_periodicity_score", 0.0))
    bursts = int(signals.get("checkpoint_burst_count", 0))
    serving = float(signals.get("serving_counterevidence_score", 0.0))
    storage_overlap = float(signals.get("storage_operation_overlap_fraction", 0.0))
    bytes_explained = float(signals.get("bytes_explained_fraction", 0.0))
    regularity = float(signals.get("benchmark_regularity_score", 0.0))

    raw: dict = {
        "accelerator_count_by_family_sku": [
            {
                "valid_from": audit_window["start"],
                "valid_to": audit_window["end"],
                "accelerator_family": "SYN",
                "accelerator_sku": "SYN-ACCEL",
                "memory_class": "synthetic_high_bandwidth",
                "form_factor": "synthetic_module",
                "count": count,
            }
        ],
        "advertised_peak_rate_by_precision": [
            {
                "valid_from": audit_window["start"],
                "valid_to": audit_window["end"],
                "precision_or_mode": "synthetic_tensor_ops",
                "peak_rate": peak,
            }
        ],
        "scaleout_fabric_domain_graph": [
            {
                "valid_from": audit_window["start"],
                "valid_to": audit_window["end"],
                "scaleout_fabric_type": "synthetic_low_latency_fabric",
                "node_count": max(1, count // 8),
                "link_count": max(1, count * 4),
                "link_bandwidth_gbps": 800,
                "switch_count": max(1, count // 64),
            }
        ],
        "electrical_service_status_intervals": [
            {
                "start_time": audit_window["start"],
                "end_time": audit_window["end"],
                "service_status": "energized",
                "service_capacity_mw": round(count * 0.0009, 4),
                "service_capacity_mva": round(count * 0.001, 4),
                "service_voltage_kv": 34.5,
                "service_class": "synthetic_datacenter_service",
            }
        ],
    }
    if allocation and count > 0:
        allocated = max(1, min(count, participants or int(count * max(activity, 0.1))))
        raw["allocated_accelerator_count_by_sku"] = [
            {
                "start_time": audit_window["start"],
                "end_time": audit_window["end"],
                "accelerator_sku": "SYN-ACCEL",
                "accelerator_profile": "full",
                "partition_scope": "accelerator_pool",
                "count": allocated,
            }
        ]
        raw["compute_running_intervals"] = [
            {
                "start_time": audit_window["start"],
                "end_time": audit_window["end"],
                "compute_resource_state": "running",
                "accelerator_count": allocated,
                "accelerator_shape_or_sku": "SYN-ACCEL",
            }
        ]
    if activity > 0:
        # Both records equal the activity_score signal exactly: the code derives
        # activity as max(raw busy, raw tensor, signal), so any raw value above
        # the signal would silently shift the decision surface.
        raw["accelerator_busy_or_utilization_fraction"] = [
            {"sample_time": iso(mid), "value": activity}
        ]
        raw["tensor_matrix_mxu_neuron_or_engine_active_fraction"] = [
            {"sample_time": iso(mid), "value": activity, "engine_scope": "all_accelerators"}
        ]
    if achieved > 0:
        raw["generic_achieved_operation_rate"] = [
            {
                "sample_time": iso(mid),
                "operation_rate": achieved / max(duration_seconds, 1.0),
                "operation_unit": "synthetic_normalized_operations",
                "counter_scope": "accelerator_pool",
            }
        ]
    if fabric > 0 or regularity > 0 or participants > 0:
        raw["fabric_port_device_sample_counters"] = [
            {"sample_time": iso(mid), "counter_name": "collective_cadence_score",
             "counter_value": fabric, "counter_unit": "score_0_to_1",
             "monitored_scope_category": "accelerator_pool"},
            {"sample_time": iso(mid), "counter_name": "participant_count",
             "counter_value": participants, "counter_unit": "accelerators",
             "monitored_scope_category": "accelerator_pool"},
            {"sample_time": iso(mid), "counter_name": "regularity_score",
             "counter_value": regularity, "counter_unit": "score_0_to_1",
             "monitored_scope_category": "accelerator_pool"},
        ]
        if fabric > 0:
            raw["scaleout_port_tx_rx_bytes_packets"] = [
                {
                    "sample_time": iso(mid),
                    "tx_bytes": int(fabric * 10 ** 16),
                    "rx_bytes": int(fabric * 10 ** 16),
                    "tx_packets": int(fabric * 10 ** 9),
                    "rx_packets": int(fabric * 10 ** 9),
                }
            ]
    if checkpoint > 0 and bursts > 0:
        # Exactly `bursts` records: len(storage_write_operation_bytes) is the
        # raw fallback for checkpoint_burst_count.
        raw["storage_write_operation_bytes"] = []
        raw["object_storage_operation_counts"] = []
        for idx in range(bursts):
            burst_start = start + timedelta(seconds=(idx + 1) * duration_seconds / (bursts + 2))
            burst_end = burst_start + timedelta(minutes=45)
            raw["storage_write_operation_bytes"].append(
                {
                    "start_time": iso(burst_start),
                    "end_time": iso(burst_end),
                    "write_operation_count": int(1000 + checkpoint * 10000),
                    "write_bytes": int(checkpoint * 10 ** 15),
                }
            )
            raw["object_storage_operation_counts"].append(
                {
                    "start_time": iso(burst_start),
                    "end_time": iso(burst_end),
                    "operation_type": "synthetic_checkpoint_state_write",
                    "operation_count": int(1000 + checkpoint * 10000),
                    "object_count": int(128 + checkpoint * 4096),
                    "bytes": int(checkpoint * 10 ** 15),
                    "object_count_type": "distinct_objects",
                }
            )
    if serving > 0:
        raw["load_balancer_gateway_flow_activity"] = [
            {
                "start_time": audit_window["start"],
                "end_time": audit_window["end"],
                "connection_count": int(serving * 10_000_000),
                "bytes": int(serving * 10 ** 15),
            }
        ]
        raw["north_south_external_egress"] = [
            {
                "start_time": audit_window["start"],
                "end_time": audit_window["end"],
                "bytes": int(serving * 10 ** 15),
                "flow_count": int(serving * 1_000_000),
                "direction": "egress",
            }
        ]
    if storage_overlap > 0 or bytes_explained > 0:
        raw["storage_operation_intervals"] = [
            {
                "start_time": audit_window["start"],
                "end_time": audit_window["end"],
                "operation_type": storage_op_type,
                "bytes_moved": int(max(bytes_explained, 0.01) * 10 ** 16),
            }
        ]
    if signals.get("physical_timeline_conflict"):
        raw["electrical_service_status_intervals"] = [
            {
                "start_time": audit_window["start"],
                "end_time": audit_window["end"],
                "service_status": "not_energized",
                "service_capacity_mw": 0,
                "service_capacity_mva": 0,
                "service_voltage_kv": 34.5,
                "service_class": "synthetic_datacenter_service",
            }
        ]
        raw["asset_receiving_installation_events"] = [
            {
                "event_time": iso(end + timedelta(days=2)),
                "event_type": "installed",
                "asset_category": "accelerator",
                "asset_quantity": count,
            }
        ]
    if signals.get("health_throttle_conflict"):
        raw["accelerator_health_error_state"] = [
            {
                "sample_time": iso(mid),
                "ecc_error_count": 0,
                "retired_page_count": 0,
                "xid_or_equivalent_error_count": 12,
                "reset_count": 4,
                "link_error_count": 50,
                "throttle_event_count": 200,
                "degraded_state": True,
            }
        ]
        raw["accelerator_throttle_state"] = [{"sample_time": iso(mid), "state": "throttled"}]
    if signals.get("topology_route_conflict"):
        raw["topology_change_events"] = [
            {
                "event_time": iso(mid),
                "topology_change_type": "route_change",
                "affected_asset_category": "fabric_port",
                "affected_link_or_port_count": max(1, count // 4),
            }
        ]
        raw["network_gateway_nat_route_state"] = [
            {
                "event_time": iso(mid),
                "network_control_type": "route",
                "state_event_type": "updated",
                "state": "visibility_updated",
            }
        ]
    if signals.get("power_activity_conflict"):
        raw["rack_pdu_it_power"] = [
            {
                "sample_time": iso(mid),
                "power_watts": count * 900,
                "energy_joules": count * 900 * duration_seconds,
            }
        ]
    for feature_id in omit_raw:
        raw.pop(feature_id, None)
    return raw


def build_site(
    *,
    site_id: str,
    scenario_key: str,
    scenario_name: str,
    duration_seconds: float,
    count: int,
    coverage: dict,
    signals: dict,
    peak: float = PEAK_RATE,
    allocation: bool = True,
    storage_op_type: str = "backup",
    omit_raw_channels: tuple = (),
    expected_route_set: Optional[list] = None,
) -> dict:
    audit_window = window_for(duration_seconds)
    omit_raw: set = set()
    for channel in omit_raw_channels:
        omit_raw.update(RAW_BY_CHANNEL.get(channel, []))
    raw_features = build_raw_features(
        audit_window,
        count=count,
        peak=peak,
        signals=signals,
        allocation=allocation,
        storage_op_type=storage_op_type,
        omit_raw=omit_raw,
    )
    site = {
        "site_id": site_id,
        "scenario_key": scenario_key,
        "scenario_name": scenario_name,
        "scope": f"{site_id}/accelerator_pool",
        "audit_window": audit_window,
        "operator_context": {
            "operator_type": "synthetic_monitored_operator",
            "telemetry_stack": "inventory_scheduler_activity_fabric_storage_power_network",
            "trust_tier": "synthetic_operator_signed",
        },
        "coverage": coverage,
        "normalized_signals": signals,
        "raw_features": raw_features,
    }
    if expected_route_set is not None:
        site["expected"] = {"final_route_set": list(expected_route_set)}
    return site