"""Phase 5.11 — Compliance, Audit & Governance domain models."""
from __future__ import annotations

import uuid
from datetime import date, datetime

from sqlalchemy import Boolean, Date, DateTime, Index, Integer, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base
from app.models.base import TenantMixin, TimestampMixin, UUIDPrimaryKeyMixin
from app.models.types import ApprovalStatus, GUID, PolicyViolationSeverity, RiskLevel


class AuditRecord(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "audit_records"

    actor_user_id: Mapped[str] = mapped_column(String(100), nullable=False)
    action: Mapped[str] = mapped_column(String(100), nullable=False)
    resource_type: Mapped[str] = mapped_column(String(50), nullable=False)
    resource_id: Mapped[str] = mapped_column(String(100), nullable=False)
    source_module: Mapped[str | None] = mapped_column(String(50), nullable=True)
    before_value: Mapped[str | None] = mapped_column(Text, nullable=True)
    after_value: Mapped[str | None] = mapped_column(Text, nullable=True)
    reason: Mapped[str | None] = mapped_column(Text, nullable=True)
    correlation_id: Mapped[str | None] = mapped_column(String(100), nullable=True)
    request_id: Mapped[str | None] = mapped_column(String(100), nullable=True)
    ip_address: Mapped[str | None] = mapped_column(String(45), nullable=True)
    user_agent: Mapped[str | None] = mapped_column(String(500), nullable=True)
    session_id: Mapped[str | None] = mapped_column(String(100), nullable=True)
    is_immutable: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    __table_args__ = (
        Index("ix_audit_records_tenant_created", "tenant_id", "created_at"),
        Index("ix_audit_records_resource", "tenant_id", "resource_type", "resource_id"),
    )


class AuditHistory(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "audit_history"

    audit_record_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    event_type: Mapped[str] = mapped_column(String(50), nullable=False)
    event_data: Mapped[str | None] = mapped_column(Text, nullable=True)


class CompliancePolicy(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "compliance_policies"

    code: Mapped[str] = mapped_column(String(50), nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    policy_type: Mapped[str] = mapped_column(String(50), nullable=False)
    country_code: Mapped[str | None] = mapped_column(String(3), nullable=True)
    rules_config: Mapped[str] = mapped_column(Text, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    effective_from: Mapped[date | None] = mapped_column(Date, nullable=True)
    effective_to: Mapped[date | None] = mapped_column(Date, nullable=True)

    __table_args__ = (UniqueConstraint("tenant_id", "code", name="uq_compliance_policy_tenant_code"),)


class GovernanceRule(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "governance_rules"

    code: Mapped[str] = mapped_column(String(50), nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    rule_type: Mapped[str] = mapped_column(String(50), nullable=False)
    condition_config: Mapped[str] = mapped_column(Text, nullable=False)
    action_config: Mapped[str | None] = mapped_column(Text, nullable=True)
    priority: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    __table_args__ = (UniqueConstraint("tenant_id", "code", name="uq_governance_rule_tenant_code"),)


class ApprovalWorkflow(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "approval_workflows"

    name: Mapped[str] = mapped_column(String(255), nullable=False)
    resource_type: Mapped[str] = mapped_column(String(50), nullable=False)
    min_amount: Mapped[str | None] = mapped_column(String(50), nullable=True)
    max_amount: Mapped[str | None] = mapped_column(String(50), nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    __table_args__ = (UniqueConstraint("tenant_id", "name", name="uq_approval_workflow_tenant_name"),)


class ApprovalStep(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "approval_steps"

    workflow_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    step_number: Mapped[int] = mapped_column(Integer, nullable=False)
    approver_role: Mapped[str] = mapped_column(String(50), nullable=False)
    is_required: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)


class ApprovalRequest(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "approval_requests"

    workflow_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    resource_type: Mapped[str] = mapped_column(String(50), nullable=False)
    resource_id: Mapped[str] = mapped_column(String(100), nullable=False)
    requested_by: Mapped[str] = mapped_column(String(100), nullable=False)
    current_step: Mapped[int] = mapped_column(Integer, default=1, nullable=False)
    status: Mapped[ApprovalStatus] = mapped_column(default=ApprovalStatus.PENDING, nullable=False)
    approved_by: Mapped[str | None] = mapped_column(String(100), nullable=True)
    approved_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    rejection_reason: Mapped[str | None] = mapped_column(Text, nullable=True)

    __table_args__ = (
        Index("ix_approval_requests_resource", "tenant_id", "resource_type", "resource_id"),
    )


class Delegation(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "delegations"

    delegator_user_id: Mapped[str] = mapped_column(String(100), nullable=False)
    delegate_user_id: Mapped[str] = mapped_column(String(100), nullable=False)
    permission_scope: Mapped[str] = mapped_column(String(255), nullable=False)
    start_date: Mapped[date] = mapped_column(Date, nullable=False)
    end_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)


class RiskRecord(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "risk_records"

    code: Mapped[str] = mapped_column(String(50), nullable=False)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    risk_category: Mapped[str] = mapped_column(String(50), nullable=False)
    risk_level: Mapped[RiskLevel] = mapped_column(nullable=False)
    risk_score: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    mitigation_plan: Mapped[str | None] = mapped_column(Text, nullable=True)
    is_resolved: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)

    __table_args__ = (UniqueConstraint("tenant_id", "code", name="uq_risk_record_tenant_code"),)


class PolicyViolation(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "policy_violations"

    policy_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    resource_type: Mapped[str] = mapped_column(String(50), nullable=False)
    resource_id: Mapped[str] = mapped_column(String(100), nullable=False)
    severity: Mapped[PolicyViolationSeverity] = mapped_column(nullable=False)
    description: Mapped[str] = mapped_column(Text, nullable=False)
    detected_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    is_resolved: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)


class Evidence(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "evidence"

    resource_type: Mapped[str] = mapped_column(String(50), nullable=False)
    resource_id: Mapped[str] = mapped_column(String(100), nullable=False)
    file_name: Mapped[str] = mapped_column(String(255), nullable=False)
    file_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
    mime_type: Mapped[str | None] = mapped_column(String(100), nullable=True)
    uploaded_by: Mapped[str] = mapped_column(String(100), nullable=False)
    version: Mapped[int] = mapped_column(Integer, default=1, nullable=False)


class RetentionPolicy(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "retention_policies"

    name: Mapped[str] = mapped_column(String(255), nullable=False)
    resource_type: Mapped[str] = mapped_column(String(50), nullable=False)
    retention_days: Mapped[int] = mapped_column(Integer, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    __table_args__ = (UniqueConstraint("tenant_id", "name", name="uq_retention_policy_tenant_name"),)


class ControlDefinition(Base, UUIDPrimaryKeyMixin, TenantMixin, TimestampMixin):
    __tablename__ = "control_definitions"

    code: Mapped[str] = mapped_column(String(50), nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    control_type: Mapped[str] = mapped_column(String(50), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    validation_config: Mapped[str | None] = mapped_column(Text, nullable=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    __table_args__ = (UniqueConstraint("tenant_id", "code", name="uq_control_def_tenant_code"),)