"""Filtering, search and sorting specifications — Phase 11.8."""
from dataclasses import dataclass
from uuid import UUID

from sqlalchemy import asc, desc, or_

from app.models.bundles import (
    ExperienceBundleDefinition,
    ExperienceFeatureToggle,
    ExperienceLicenseBinding,
    ExperienceTenantBundle,
)

BUNDLE_DEFINITION_SORT = frozenset({"created_at", "updated_at", "code", "name", "status", "bundle_key"})
TENANT_BUNDLE_SORT = frozenset({"created_at", "updated_at", "status", "bundle_key", "expires_at"})
LICENSE_BINDING_SORT = frozenset({"created_at", "updated_at", "status", "starts_at", "ends_at"})
FEATURE_TOGGLE_SORT = frozenset({"created_at", "updated_at", "feature_key", "status", "enabled"})


@dataclass(frozen=True, slots=True)
class BundleListSpec:
    workspace_id: UUID | None = None
    site_id: UUID | None = None
    status: str | None = None
    bundle_key: str | None = None
    q: str | None = None
    sort_by: str = "created_at"
    sort_dir: str = "desc"
    model = None
    sort_fields = frozenset()

    def filter_clauses(self):
        m = self.model
        clauses = []
        for field in ("workspace_id", "site_id", "status", "bundle_key"):
            value = getattr(self, field)
            if value is not None and hasattr(m, field):
                clauses.append(getattr(m, field) == value)
        if self.q:
            term = f"%{self.q.strip()}%"
            searchable = [
                getattr(m, name).ilike(term)
                for name in ("code", "name", "description", "feature_key", "core_entitlement_ref")
                if hasattr(m, name)
            ]
            if searchable:
                clauses.append(or_(*searchable))
        return clauses

    def apply(self, stmt):
        clauses = self.filter_clauses()
        if clauses:
            stmt = stmt.where(*clauses)
        key = self.sort_by if self.sort_by in self.sort_fields else "created_at"
        column = getattr(self.model, key)
        return stmt.order_by(asc(column) if self.sort_dir.lower() == "asc" else desc(column))


@dataclass(frozen=True, slots=True)
class BundleDefinitionListSpec(BundleListSpec):
    model = ExperienceBundleDefinition
    sort_fields = BUNDLE_DEFINITION_SORT


@dataclass(frozen=True, slots=True)
class TenantBundleListSpec(BundleListSpec):
    model = ExperienceTenantBundle
    sort_fields = TENANT_BUNDLE_SORT


@dataclass(frozen=True, slots=True)
class LicenseBindingListSpec(BundleListSpec):
    model = ExperienceLicenseBinding
    sort_fields = LICENSE_BINDING_SORT


@dataclass(frozen=True, slots=True)
class FeatureToggleListSpec(BundleListSpec):
    model = ExperienceFeatureToggle
    sort_fields = FEATURE_TOGGLE_SORT