from sqlalchemy.orm import DeclarativeMeta

from app.modules.business import models
from app.modules.business.constants import BusinessDomain


DOMAIN_MODELS: dict[BusinessDomain, type[DeclarativeMeta]] = {
    BusinessDomain.PROJECTS: models.Project,
    BusinessDomain.TASKS: models.WorkTask,
    BusinessDomain.PROCUREMENTS: models.Procurement,
    BusinessDomain.EXPENSES: models.Expense,
    BusinessDomain.FUND_ACCOUNTS: models.FundAccount,
    BusinessDomain.POLICIES: models.Policy,
    BusinessDomain.STANDARDS: models.Standard,
    BusinessDomain.PERFORMANCE_METRICS: models.PerformanceMetric,
    BusinessDomain.SUPPLIERS: models.Supplier,
    BusinessDomain.ATTENDANCE_RECORDS: models.AttendanceRecord,
    BusinessDomain.WORK_REPORTS: models.WorkReport,
    BusinessDomain.RISK_EVENTS: models.RiskEvent,
    BusinessDomain.LEGACY_SYNC_RUNS: models.LegacySyncRun,
}

DOMAIN_WRITABLE_FIELDS: dict[BusinessDomain, frozenset[str]] = {
    BusinessDomain.PROJECTS: frozenset(
        {
            "code",
            "name",
            "owner",
            "status",
            "priority",
            "progress_percent",
            "risk_level",
            "budget_amount",
            "actual_amount",
            "start_date",
            "due_date",
            "description",
        }
    ),
    BusinessDomain.TASKS: frozenset(
        {
            "code",
            "title",
            "project_code",
            "owner",
            "status",
            "priority",
            "due_date",
            "completed_at",
            "blocker",
            "description",
        }
    ),
    BusinessDomain.PROCUREMENTS: frozenset(
        {
            "code",
            "name",
            "applicant",
            "project_code",
            "supplier_name",
            "budget_subject",
            "expected_amount",
            "actual_amount",
            "approval_status",
            "delivery_status",
            "payment_status",
            "comparison_summary",
        }
    ),
    BusinessDomain.EXPENSES: frozenset(
        {
            "code",
            "expense_type",
            "amount",
            "applicant",
            "department",
            "project_code",
            "budget_subject",
            "payment_account",
            "invoice_status",
            "approval_status",
            "payment_status",
        }
    ),
    BusinessDomain.FUND_ACCOUNTS: frozenset(
        {
            "code",
            "name",
            "account_type",
            "current_balance",
            "expected_receivable",
            "expected_payable",
            "safety_line",
            "risk_level",
            "note",
        }
    ),
    BusinessDomain.POLICIES: frozenset(
        {
            "code",
            "title",
            "policy_type",
            "owner_department",
            "version",
            "status",
            "effective_date",
            "feishu_doc_url",
            "summary",
        }
    ),
    BusinessDomain.STANDARDS: frozenset(
        {
            "code",
            "title",
            "standard_type",
            "applies_to",
            "status",
            "check_items",
            "remediation",
            "policy_code",
        }
    ),
    BusinessDomain.PERFORMANCE_METRICS: frozenset(
        {
            "code",
            "name",
            "applies_to_role",
            "formula",
            "weight",
            "data_source",
            "auto_score",
            "confirmed_score",
            "status",
        }
    ),
    BusinessDomain.SUPPLIERS: frozenset(
        {
            "code",
            "name",
            "category",
            "contact",
            "quality_score",
            "delivery_score",
            "price_score",
            "risk_level",
            "blacklist_status",
        }
    ),
    BusinessDomain.ATTENDANCE_RECORDS: frozenset(
        {
            "code",
            "employee_name",
            "employee_id",
            "department",
            "project_code",
            "work_date",
            "check_in_at",
            "check_out_at",
            "status",
            "location",
            "note",
        }
    ),
    BusinessDomain.WORK_REPORTS: frozenset(
        {
            "code",
            "report_type",
            "title",
            "reporter",
            "department",
            "project_code",
            "period_start",
            "period_end",
            "content",
            "metrics",
            "risk_summary",
            "status",
        }
    ),
    BusinessDomain.RISK_EVENTS: frozenset(
        {
            "code",
            "title",
            "risk_type",
            "risk_level",
            "status",
            "source_domain",
            "source_record_id",
            "project_code",
            "owner",
            "due_date",
            "assigned_to",
            "closed_reason",
            "review_summary",
            "description",
            "mitigation",
            "evidence",
        }
    ),
    BusinessDomain.LEGACY_SYNC_RUNS: frozenset(
        {
            "code",
            "domain",
            "source_table",
            "status",
            "created_count",
            "updated_count",
            "skipped_count",
            "error_message",
            "note",
        }
    ),
}

HIGH_RISK_DOMAINS = frozenset(DOMAIN_MODELS)
LOW_RISK_DOMAINS = frozenset(set(DOMAIN_MODELS) - HIGH_RISK_DOMAINS)


def normalize_domain(domain: str | BusinessDomain) -> BusinessDomain:
    try:
        return BusinessDomain(domain)
    except ValueError as exc:
        supported = ", ".join(sorted(item.value for item in DOMAIN_MODELS))
        raise KeyError(f"Unsupported domain '{domain}'. Supported: {supported}") from exc


def supported_domain_values() -> list[str]:
    return sorted(item.value for item in DOMAIN_MODELS)


def is_high_risk_domain(domain: str | BusinessDomain) -> bool:
    return normalize_domain(domain) in HIGH_RISK_DOMAINS


def get_domain_model(domain: str | BusinessDomain) -> type[DeclarativeMeta]:
    return DOMAIN_MODELS[normalize_domain(domain)]


def get_writable_fields(domain: str | BusinessDomain) -> frozenset[str]:
    return DOMAIN_WRITABLE_FIELDS[normalize_domain(domain)]