from __future__ import annotations

from datetime import UTC, datetime
from decimal import Decimal
from typing import Any
from uuid import uuid4

from sqlalchemy import (
    JSON,
    Boolean,
    DateTime,
    ForeignKey,
    Index,
    Integer,
    Numeric,
    String,
    Text,
    UniqueConstraint,
)
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.core.database import Base


def new_id() -> str:
    return str(uuid4())


def now_utc() -> datetime:
    return datetime.now(UTC)


class TimestampMixin:
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=now_utc,
        nullable=False,
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=now_utc,
        onupdate=now_utc,
        nullable=False,
    )


class Tenant(Base, TimestampMixin):
    __tablename__ = "crm_tenants"

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    slug: Mapped[str] = mapped_column(String(80), unique=True, nullable=False)
    name: Mapped[str] = mapped_column(String(160), nullable=False)
    mode: Mapped[str] = mapped_column(String(24), default="standalone", nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    settings: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)


class User(Base, TimestampMixin):
    __tablename__ = "crm_users"
    __table_args__ = (
        UniqueConstraint("tenant_id", "email", name="uq_crm_users_tenant_email"),
        Index("ix_crm_users_tenant_role", "tenant_id", "role"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    email: Mapped[str] = mapped_column(String(255), nullable=False)
    full_name: Mapped[str] = mapped_column(String(160), nullable=False)
    password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
    role: Mapped[str] = mapped_column(String(24), default="member", nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    last_login_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))

    tenant: Mapped[Tenant] = relationship()


class Organization(Base, TimestampMixin):
    __tablename__ = "crm_organizations"
    __table_args__ = (
        Index("ix_crm_organizations_tenant_name", "tenant_id", "name"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    legal_name: Mapped[str | None] = mapped_column(String(240))
    website: Mapped[str | None] = mapped_column(String(500))
    primary_email: Mapped[str | None] = mapped_column(String(255))
    phone: Mapped[str | None] = mapped_column(String(80))
    industry: Mapped[str | None] = mapped_column(String(120))
    address: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    attributes: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    owner_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_users.id", ondelete="SET NULL"),
    )

    owner: Mapped[User | None] = relationship()
    contacts: Mapped[list[Contact]] = relationship(back_populates="organization")


class Contact(Base, TimestampMixin):
    __tablename__ = "crm_contacts"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "primary_email",
            name="uq_crm_contacts_tenant_primary_email",
        ),
        Index("ix_crm_contacts_tenant_name", "tenant_id", "last_name", "first_name"),
        Index("ix_crm_contacts_tenant_score", "tenant_id", "score"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    first_name: Mapped[str] = mapped_column(String(100), nullable=False)
    last_name: Mapped[str] = mapped_column(String(100), default="", nullable=False)
    job_title: Mapped[str | None] = mapped_column(String(160))
    primary_email: Mapped[str | None] = mapped_column(String(255))
    emails: Mapped[list[dict[str, Any]]] = mapped_column(JSON, default=list, nullable=False)
    phones: Mapped[list[dict[str, Any]]] = mapped_column(JSON, default=list, nullable=False)
    lifecycle_stage: Mapped[str] = mapped_column(String(40), default="lead", nullable=False)
    lead_source: Mapped[str | None] = mapped_column(String(120))
    score: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    organization_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_organizations.id", ondelete="SET NULL"),
        index=True,
    )
    owner_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_users.id", ondelete="SET NULL"),
    )
    attributes: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)

    organization: Mapped[Organization | None] = relationship(back_populates="contacts")
    owner: Mapped[User | None] = relationship()

    @property
    def name(self) -> str:
        return f"{self.first_name} {self.last_name}".strip()


class Pipeline(Base, TimestampMixin):
    __tablename__ = "crm_pipelines"
    __table_args__ = (
        UniqueConstraint("tenant_id", "name", name="uq_crm_pipelines_tenant_name"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    name: Mapped[str] = mapped_column(String(140), nullable=False)
    is_default: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    stages: Mapped[list[Stage]] = relationship(
        back_populates="pipeline",
        cascade="all, delete-orphan",
        order_by="Stage.position",
    )


class Stage(Base, TimestampMixin):
    __tablename__ = "crm_stages"
    __table_args__ = (
        UniqueConstraint(
            "pipeline_id",
            "name",
            name="uq_crm_stages_pipeline_name",
        ),
        Index("ix_crm_stages_pipeline_position", "pipeline_id", "position"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    pipeline_id: Mapped[str] = mapped_column(
        ForeignKey("crm_pipelines.id", ondelete="CASCADE"),
        nullable=False,
    )
    name: Mapped[str] = mapped_column(String(140), nullable=False)
    position: Mapped[int] = mapped_column(Integer, nullable=False)
    probability: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    color: Mapped[str] = mapped_column(String(16), default="#64748b", nullable=False)

    pipeline: Mapped[Pipeline] = relationship(back_populates="stages")


class LeadSource(Base, TimestampMixin):
    __tablename__ = "crm_lead_sources"
    __table_args__ = (
        UniqueConstraint("tenant_id", "name", name="uq_crm_lead_sources_tenant_name"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    name: Mapped[str] = mapped_column(String(120), nullable=False)


class LeadType(Base, TimestampMixin):
    __tablename__ = "crm_lead_types"
    __table_args__ = (
        UniqueConstraint("tenant_id", "name", name="uq_crm_lead_types_tenant_name"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    name: Mapped[str] = mapped_column(String(120), nullable=False)


class Lead(Base, TimestampMixin):
    __tablename__ = "crm_leads"
    __table_args__ = (
        Index("ix_crm_leads_tenant_stage", "tenant_id", "stage_id", "position"),
        Index("ix_crm_leads_tenant_status", "tenant_id", "status"),
        Index("ix_crm_leads_tenant_owner", "tenant_id", "owner_id"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    title: Mapped[str] = mapped_column(String(240), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    value: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0, nullable=False)
    currency: Mapped[str] = mapped_column(String(3), default="USD", nullable=False)
    status: Mapped[str] = mapped_column(String(24), default="open", nullable=False)
    score: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    position: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    lost_reason: Mapped[str | None] = mapped_column(Text)
    expected_close_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    closed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    contact_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_contacts.id", ondelete="SET NULL"),
        index=True,
    )
    organization_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_organizations.id", ondelete="SET NULL"),
        index=True,
    )
    owner_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_users.id", ondelete="SET NULL"),
    )
    pipeline_id: Mapped[str] = mapped_column(
        ForeignKey("crm_pipelines.id", ondelete="RESTRICT"),
        nullable=False,
    )
    stage_id: Mapped[str] = mapped_column(
        ForeignKey("crm_stages.id", ondelete="RESTRICT"),
        nullable=False,
    )
    source_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_lead_sources.id", ondelete="SET NULL"),
    )
    type_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_lead_types.id", ondelete="SET NULL"),
    )
    attributes: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)

    contact: Mapped[Contact | None] = relationship()
    organization: Mapped[Organization | None] = relationship()
    owner: Mapped[User | None] = relationship()
    pipeline: Mapped[Pipeline] = relationship()
    stage: Mapped[Stage] = relationship()
    source: Mapped[LeadSource | None] = relationship()
    lead_type: Mapped[LeadType | None] = relationship()


class Activity(Base, TimestampMixin):
    __tablename__ = "crm_activities"
    __table_args__ = (
        Index("ix_crm_activities_tenant_due", "tenant_id", "is_done", "due_at"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    activity_type: Mapped[str] = mapped_column(String(32), nullable=False)
    title: Mapped[str] = mapped_column(String(240), nullable=False)
    details: Mapped[str | None] = mapped_column(Text)
    starts_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    ends_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    due_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    is_done: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    completed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    owner_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_users.id", ondelete="SET NULL"),
    )
    contact_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_contacts.id", ondelete="CASCADE"),
        index=True,
    )
    organization_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_organizations.id", ondelete="CASCADE"),
        index=True,
    )
    lead_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_leads.id", ondelete="CASCADE"),
        index=True,
    )
    additional: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)

    owner: Mapped[User | None] = relationship()
    contact: Mapped[Contact | None] = relationship()
    organization: Mapped[Organization | None] = relationship()
    lead: Mapped[Lead | None] = relationship()


class Product(Base, TimestampMixin):
    __tablename__ = "crm_products"
    __table_args__ = (
        UniqueConstraint("tenant_id", "sku", name="uq_crm_products_tenant_sku"),
        Index("ix_crm_products_tenant_name", "tenant_id", "name"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    sku: Mapped[str] = mapped_column(String(100), nullable=False)
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    quantity: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    price: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0, nullable=False)
    currency: Mapped[str] = mapped_column(String(3), default="USD", nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)


class Quote(Base, TimestampMixin):
    __tablename__ = "crm_quotes"
    __table_args__ = (
        UniqueConstraint("tenant_id", "number", name="uq_crm_quotes_tenant_number"),
        Index("ix_crm_quotes_tenant_status", "tenant_id", "status"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    number: Mapped[str] = mapped_column(String(80), nullable=False)
    subject: Mapped[str] = mapped_column(String(240), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    status: Mapped[str] = mapped_column(String(32), default="draft", nullable=False)
    currency: Mapped[str] = mapped_column(String(3), default="USD", nullable=False)
    billing_address: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    shipping_address: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    discount_amount: Mapped[Decimal] = mapped_column(
        Numeric(14, 2),
        default=0,
        nullable=False,
    )
    tax_amount: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0, nullable=False)
    adjustment_amount: Mapped[Decimal] = mapped_column(
        Numeric(14, 2),
        default=0,
        nullable=False,
    )
    subtotal: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0, nullable=False)
    grand_total: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0, nullable=False)
    expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    contact_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_contacts.id", ondelete="SET NULL"),
    )
    organization_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_organizations.id", ondelete="SET NULL"),
    )
    lead_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_leads.id", ondelete="SET NULL"),
    )
    owner_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_users.id", ondelete="SET NULL"),
    )

    items: Mapped[list[QuoteItem]] = relationship(
        back_populates="quote",
        cascade="all, delete-orphan",
    )


class QuoteItem(Base, TimestampMixin):
    __tablename__ = "crm_quote_items"

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    quote_id: Mapped[str] = mapped_column(
        ForeignKey("crm_quotes.id", ondelete="CASCADE"),
        nullable=False,
    )
    product_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_products.id", ondelete="SET NULL"),
    )
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    quantity: Mapped[Decimal] = mapped_column(Numeric(12, 2), default=1, nullable=False)
    unit_price: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0, nullable=False)
    tax_rate: Mapped[Decimal] = mapped_column(Numeric(6, 3), default=0, nullable=False)
    line_total: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0, nullable=False)

    quote: Mapped[Quote] = relationship(back_populates="items")


class AuditEvent(Base):
    __tablename__ = "crm_audit_events"
    __table_args__ = (
        Index("ix_crm_audit_tenant_entity", "tenant_id", "entity_type", "entity_id"),
        Index("ix_crm_audit_tenant_created", "tenant_id", "created_at"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
    )
    actor_id: Mapped[str | None] = mapped_column(
        ForeignKey("crm_users.id", ondelete="SET NULL"),
    )
    action: Mapped[str] = mapped_column(String(100), nullable=False)
    entity_type: Mapped[str] = mapped_column(String(80), nullable=False)
    entity_id: Mapped[str] = mapped_column(String(80), nullable=False)
    payload: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=now_utc,
        nullable=False,
    )


class IntegrationEvent(Base):
    __tablename__ = "crm_integration_events"
    __table_args__ = (
        Index("ix_crm_integration_events_delivery", "status", "available_at"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
    )
    topic: Mapped[str] = mapped_column(String(140), nullable=False)
    payload: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    status: Mapped[str] = mapped_column(String(24), default="pending", nullable=False)
    attempts: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    available_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=now_utc,
        nullable=False,
    )
    delivered_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=now_utc,
        nullable=False,
    )


class IntegrationCredential(Base, TimestampMixin):
    __tablename__ = "crm_integration_credentials"
    __table_args__ = (
        UniqueConstraint("tenant_id", "name", name="uq_crm_integration_key_name"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    name: Mapped[str] = mapped_column(String(120), nullable=False)
    key_prefix: Mapped[str] = mapped_column(String(20), nullable=False)
    key_hash: Mapped[str] = mapped_column(String(64), nullable=False, unique=True)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    last_used_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))


class ExternalLink(Base, TimestampMixin):
    __tablename__ = "crm_external_links"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "provider",
            "entity_type",
            "external_id",
            name="uq_crm_external_links_provider_entity",
        ),
        Index("ix_crm_external_links_local", "tenant_id", "entity_type", "entity_id"),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
    )
    provider: Mapped[str] = mapped_column(String(80), nullable=False)
    entity_type: Mapped[str] = mapped_column(String(80), nullable=False)
    entity_id: Mapped[str] = mapped_column(String(36), nullable=False)
    external_id: Mapped[str] = mapped_column(String(255), nullable=False)
    metadata_json: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)


class IdempotencyRecord(Base):
    __tablename__ = "crm_idempotency_records"
    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "scope",
            "idempotency_key",
            name="uq_crm_idempotency_scope_key",
        ),
    )

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_id)
    tenant_id: Mapped[str] = mapped_column(
        ForeignKey("crm_tenants.id", ondelete="CASCADE"),
        nullable=False,
    )
    scope: Mapped[str] = mapped_column(String(100), nullable=False)
    idempotency_key: Mapped[str] = mapped_column(String(255), nullable=False)
    response_code: Mapped[int] = mapped_column(Integer, nullable=False)
    response_body: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=now_utc,
        nullable=False,
    )