from __future__ import annotations

import json
from decimal import Decimal
from pathlib import Path
from typing import Any

from ._repo_root import ensure_repo_root_on_syspath
from .models import PricingModel, Product

ensure_repo_root_on_syspath()

from adaptive_pricing_core.provider_publication import (  # noqa: E402
    CatalogProduct,
    ProviderPublicationState,
    apply_publication,
    build_publication_bundle,
    plan_publication,
    provider_state_from_dict,
    provider_state_to_dict,
    rollback_publication,
)
from adaptive_pricing_core.stripe_provider import map_bundle_to_stripe  # noqa: E402


def _serialize(value: Any) -> Any:
    if isinstance(value, Decimal):
        return str(value)
    if hasattr(value, "__dataclass_fields__"):
        return {key: _serialize(getattr(value, key)) for key in value.__dataclass_fields__}
    if isinstance(value, tuple):
        return [_serialize(item) for item in value]
    if isinstance(value, list):
        return [_serialize(item) for item in value]
    if isinstance(value, dict):
        return {key: _serialize(item) for key, item in value.items()}
    return value


def default_stripe_state_path(data_dir: Path) -> Path:
    return data_dir / "provider_state" / "stripe-publication.json"


def load_stripe_publication_state(path: Path) -> ProviderPublicationState:
    if not path.exists():
        return ProviderPublicationState(provider="stripe")
    return provider_state_from_dict(json.loads(path.read_text(encoding="utf-8")))


def save_stripe_publication_state(path: Path, state: ProviderPublicationState) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(
        json.dumps(provider_state_to_dict(state), indent=2),
        encoding="utf-8",
    )


def _catalog_product(product: Product) -> CatalogProduct:
    return CatalogProduct(
        id=product.id,
        name=product.name,
        description=product.description,
        currency=product.currency,
        lifecycle_phase=product.lifecycle_phase,
        active_pricing_model_id=product.active_pricing_model_id,
        metadata={"product_channel": "membership"},
    )


def _target_model(
    models: list[PricingModel],
    product: Product,
    model_id: str | None = None,
) -> PricingModel:
    requested_id = model_id or product.active_pricing_model_id
    return next(item for item in models if item.id == requested_id)


def build_stripe_publication_preview(
    product: Product,
    models: list[PricingModel],
    data_dir: Path,
    *,
    model_id: str | None = None,
    state_path: Path | None = None,
) -> dict[str, Any]:
    model = _target_model(models, product, model_id)
    bundle = build_publication_bundle(_catalog_product(product), model)
    package = map_bundle_to_stripe(bundle)
    state = load_stripe_publication_state(state_path or default_stripe_state_path(data_dir))
    plan = plan_publication(package, state)

    return _serialize(
        {
            "provider": "stripe",
            "state_path": str(state_path or default_stripe_state_path(data_dir)),
            "model_id": model.id,
            "model_name": model.name,
            "current_state": {
                "active_revision_id": state.active_revision_id,
                "active_model_id": state.active_model_id,
                "artifact_count": len(state.artifacts),
                "revision_count": len(state.revisions),
            },
            "artifact_counts": {
                "exact": sum(item.mapping_status == "exact" for item in package.artifacts),
                "approximate": sum(item.mapping_status == "approximate" for item in package.artifacts),
                "unsupported": sum(item.mapping_status == "unsupported" for item in package.artifacts),
            },
            "plan": plan,
            "notes": package.notes,
        }
    )


def publish_to_stripe_shadow(
    product: Product,
    models: list[PricingModel],
    data_dir: Path,
    *,
    model_id: str | None = None,
    state_path: Path | None = None,
) -> dict[str, Any]:
    path = state_path or default_stripe_state_path(data_dir)
    model = _target_model(models, product, model_id)
    bundle = build_publication_bundle(_catalog_product(product), model)
    package = map_bundle_to_stripe(bundle)
    current_state = load_stripe_publication_state(path)
    result = apply_publication(package, current_state)
    save_stripe_publication_state(path, result.state)

    return _serialize(
        {
            "provider": "stripe",
            "state_path": str(path),
            "model_id": model.id,
            "model_name": model.name,
            "result": result,
        }
    )


def rollback_stripe_shadow(
    data_dir: Path,
    revision_id: str,
    *,
    state_path: Path | None = None,
) -> dict[str, Any]:
    path = state_path or default_stripe_state_path(data_dir)
    current_state = load_stripe_publication_state(path)
    result = rollback_publication(current_state, revision_id)
    save_stripe_publication_state(path, result.state)
    return _serialize(
        {
            "provider": "stripe",
            "state_path": str(path),
            "result": result,
        }
    )