"""
Application tracking models - Kanban board for job applications.
"""
import uuid
from datetime import datetime
from enum import Enum

from sqlalchemy import DateTime, ForeignKey, Integer, String, Text, func
from sqlalchemy.dialects.postgresql import JSONB, UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.core.database import Base


class ApplicationStatus(str, Enum):
    WISHLIST = "wishlist"
    APPLYING = "applying"
    APPLIED = "applied"
    SCREENING = "screening"
    INTERVIEWING = "interviewing"
    OFFER = "offer"
    ACCEPTED = "accepted"
    REJECTED = "rejected"
    WITHDRAWN = "withdrawn"
    GHOSTED = "ghosted"


class InterviewType(str, Enum):
    PHONE_SCREEN = "phone_screen"
    TECHNICAL = "technical"
    BEHAVIORAL = "behavioral"
    SYSTEM_DESIGN = "system_design"
    ONSITE = "onsite"
    HIRING_MANAGER = "hiring_manager"
    TAKE_HOME = "take_home"
    FINAL = "final"
    OTHER = "other"


class Application(Base):
    __tablename__ = "applications"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    job_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("jobs.id", ondelete="SET NULL"), nullable=True, index=True)
    custom_job_title: Mapped[str | None] = mapped_column(String(512), nullable=True)
    custom_company_name: Mapped[str | None] = mapped_column(String(256), nullable=True)
    custom_job_url: Mapped[str | None] = mapped_column(String(2048), nullable=True)
    status: Mapped[str] = mapped_column(String(30), default=ApplicationStatus.WISHLIST, nullable=False, index=True)
    priority: Mapped[int] = mapped_column(Integer, default=0)
    applied_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    response_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    resume_version_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), nullable=True)
    cover_letter: Mapped[str | None] = mapped_column(Text, nullable=True)
    referral_contact: Mapped[str | None] = mapped_column(String(256), nullable=True)
    referral_notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    offered_salary: Mapped[int | None] = mapped_column(Integer, nullable=True)
    offered_equity: Mapped[str | None] = mapped_column(String(100), nullable=True)
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    tags: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    extra_data: Mapped[dict | None] = mapped_column("metadata", JSONB, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

    user: Mapped["User"] = relationship(back_populates="applications")
    job: Mapped["Job"] = relationship(back_populates="applications")
    events: Mapped[list["ApplicationEvent"]] = relationship(back_populates="application", cascade="all, delete-orphan")
    interviews: Mapped[list["Interview"]] = relationship(back_populates="application", cascade="all, delete-orphan")
    contacts: Mapped[list["Contact"]] = relationship(back_populates="application")


class ApplicationEvent(Base):
    """Timeline events for an application."""
    __tablename__ = "application_events"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    application_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("applications.id", ondelete="CASCADE"), nullable=False, index=True)
    event_type: Mapped[str] = mapped_column(String(50), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    old_value: Mapped[str | None] = mapped_column(String(100), nullable=True)
    new_value: Mapped[str | None] = mapped_column(String(100), nullable=True)
    extra_data: Mapped[dict | None] = mapped_column("metadata", JSONB, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    application: Mapped["Application"] = relationship(back_populates="events")


class Interview(Base):
    __tablename__ = "interviews"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    application_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("applications.id", ondelete="CASCADE"), nullable=False, index=True)
    interview_type: Mapped[str] = mapped_column(String(30), nullable=False)
    scheduled_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    duration_minutes: Mapped[int | None] = mapped_column(Integer, nullable=True)
    location: Mapped[str | None] = mapped_column(String(512), nullable=True)
    interviewer_names: Mapped[list | None] = mapped_column(JSONB, nullable=True)
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    prep_notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    outcome: Mapped[str | None] = mapped_column(String(30), nullable=True)
    feedback: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    application: Mapped["Application"] = relationship(back_populates="interviews")


class Contact(Base):
    """Contacts associated with applications (recruiters, hiring managers)."""
    __tablename__ = "contacts"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    application_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), ForeignKey("applications.id", ondelete="SET NULL"), nullable=True, index=True)
    user_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    name: Mapped[str] = mapped_column(String(256), nullable=False)
    role: Mapped[str | None] = mapped_column(String(100), nullable=True)
    company: Mapped[str | None] = mapped_column(String(256), nullable=True)
    email: Mapped[str | None] = mapped_column(String(320), nullable=True)
    phone: Mapped[str | None] = mapped_column(String(30), nullable=True)
    linkedin_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    application: Mapped["Application"] = relationship(back_populates="contacts")