from __future__ import annotations

import json
from datetime import datetime, timezone
from pathlib import Path
from typing import Any

from .deployment_overlay import normalize_deployment_overlay
from .financial import (
    FINANCIAL_API_VERSION,
    FINANCIAL_SCHEMA_VERSION,
    financial_graph_errors,
    materialize_financial_graph_export,
)
from .loader import load_yaml, repo_root

DEFAULT_BASELINE_PATH = repo_root() / "fabric" / "financial" / "railiance-netkingdom.yaml"


def load_financial_baseline(path: Path | None = None) -> dict[str, Any]:
    baseline_path = path or DEFAULT_BASELINE_PATH
    data = load_yaml(baseline_path)
    if not isinstance(data, dict):
        raise ValueError(f"financial baseline must be a mapping: {baseline_path}")
    if data.get("kind") != "FinancialFabricBaseline":
        raise ValueError(f"financial baseline kind must be FinancialFabricBaseline: {baseline_path}")
    spec = data.get("spec")
    if not isinstance(spec, dict):
        raise ValueError(f"financial baseline spec must be a mapping: {baseline_path}")
    return spec


def financial_export_from_legacy(
    legacy_graph: dict[str, Any],
    baseline: dict[str, Any] | None = None,
) -> dict[str, Any]:
    baseline = json.loads(json.dumps(baseline or load_financial_baseline()))
    defaults = baseline.get("defaults") if isinstance(baseline.get("defaults"), dict) else {}
    containment_default = defaults.get("containment") if isinstance(defaults.get("containment"), dict) else {}
    ownership_default = defaults.get("ownership") if isinstance(defaults.get("ownership"), dict) else {}
    accounting_default = defaults.get("accounting") if isinstance(defaults.get("accounting"), dict) else {}

    graph = {
        "apiVersion": FINANCIAL_API_VERSION,
        "kind": "FabricGraphExport",
        "schema_version": FINANCIAL_SCHEMA_VERSION,
        "source": {
            **_object(legacy_graph.get("source")),
            "producer": "railiance-fabric",
            "generation_reason": "baseline_projection",
        },
        "compatibility": {
            "legacy_v1alpha1_supported": True,
            "breaking_reset": False,
            "projected_from_apiVersion": legacy_graph.get("apiVersion"),
        },
        "netkingdom": baseline.get("netkingdom", {}),
        "actors": baseline.get("actors", []),
        "fabrics": baseline.get("fabrics", []),
        "nodes": [
            _financial_node_from_legacy(node, containment_default, ownership_default, accounting_default)
            for node in legacy_graph.get("nodes", [])
            if isinstance(node, dict)
        ],
        "edges": [
            _financial_edge_from_legacy(edge)
            for edge in legacy_graph.get("edges", [])
            if isinstance(edge, dict)
        ],
        "unresolved": [],
    }
    graph["generated_at"] = legacy_graph.get("generated_at") or _utc_now()
    materialized = materialize_financial_graph_export(graph)
    errors = financial_graph_errors(materialized)
    if errors:
        raise ValueError(f"invalid financial baseline projection: {errors[0]}")
    return materialized


def _financial_node_from_legacy(
    node: dict[str, Any],
    containment_default: dict[str, Any],
    ownership_default: dict[str, Any],
    accounting_default: dict[str, Any],
) -> dict[str, Any]:
    result: dict[str, Any] = {
        "id": node.get("id", ""),
        "kind": _node_kind(node),
        "name": node.get("name") or node.get("id", ""),
        "repo": node.get("repo", ""),
        "domain": node.get("domain", ""),
        "lifecycle": node.get("lifecycle", ""),
        "containment": json.loads(json.dumps(containment_default)),
        "ownership": json.loads(json.dumps(ownership_default)),
        "evidence_state": node.get("evidence_state", "declared"),
        "attributes": _object(node.get("attributes")),
    }
    accounting = _object(result["attributes"].get("accounting")) or accounting_default
    if _has_value(accounting):
        result["accounting"] = json.loads(json.dumps(accounting))
    overlay = normalize_deployment_overlay(
        node.get("deployment_overlay") if isinstance(node.get("deployment_overlay"), dict) else {},
        result["attributes"],
        result["containment"],
    )
    if _has_value(overlay):
        result["deployment_overlay"] = overlay
    for key in ("canon_category", "canon_anchor", "mapping_fit"):
        if node.get(key):
            result[key] = node[key]
    return result


def _financial_edge_from_legacy(edge: dict[str, Any]) -> dict[str, Any]:
    result = {
        "from": edge.get("from", ""),
        "to": edge.get("to", ""),
        "type": edge.get("type", ""),
        "attributes": _object(edge.get("attributes")),
    }
    for key in ("canonical_type", "canon_anchor", "mapping_fit", "display_only", "evidence_state"):
        if key in edge:
            result[key] = edge[key]
    overlay = normalize_deployment_overlay(
        edge.get("deployment_overlay") if isinstance(edge.get("deployment_overlay"), dict) else {},
        result["attributes"],
    )
    if _has_value(overlay):
        result["deployment_overlay"] = overlay
    return result


def _node_kind(node: dict[str, Any]) -> str:
    kind = str(node.get("kind") or "")
    if kind == "ServiceDeclaration":
        return "Service"
    if kind == "InterfaceDeclaration":
        return "UtilityInterface"
    return kind or "DiscoveredEntity"


def _object(value: Any) -> dict[str, Any]:
    return value if isinstance(value, dict) else {}


def _has_value(value: Any) -> bool:
    if isinstance(value, dict):
        return any(_has_value(item) for item in value.values())
    if isinstance(value, list):
        return any(_has_value(item) for item in value)
    return value not in (None, "")


def _utc_now() -> str:
    return datetime.now(timezone.utc).replace(microsecond=0).isoformat().replace("+00:00", "Z")