import enum
from datetime import date, datetime

from sqlalchemy import Column, Date, Enum, ForeignKey, Integer, String, Table, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.sql import func

from app.database import Base
from app.models.habit import _by_value


class JournalMood(str, enum.Enum):
    PAIN = "pain"  # 아픔
    ACHIEVEMENT = "achievement"  # 성취
    ANGER = "anger"  # 분노
    EXCITED = "excited"  # 신남
    CALM = "calm"  # 평온
    HAPPY = "happy"  # 행복
    WORRY = "worry"  # 걱정
    TIRED = "tired"  # 피곤
    SAD = "sad"  # 슬픔


class JournalAttachmentType(str, enum.Enum):
    IMAGE = "image"
    VIDEO = "video"


journal_entry_tag = Table(
    "journal_entry_tag",
    Base.metadata,
    Column("entry_id", ForeignKey("journal_entry.id", ondelete="CASCADE"), primary_key=True),
    Column("tag_id", ForeignKey("journal_tag.id", ondelete="CASCADE"), primary_key=True),
)


class JournalCategory(Base):
    __tablename__ = "journal_category"
    __table_args__ = (UniqueConstraint("user_id", "name", name="uq_journal_category_user_name"),)

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("user.id", ondelete="CASCADE"), nullable=False)
    name: Mapped[str] = mapped_column(String(50), nullable=False)
    color: Mapped[str | None] = mapped_column(String(20), nullable=True)
    sort_order: Mapped[int | None] = mapped_column(Integer, nullable=True)
    # 이 카테고리로 새 기록을 쓸 때 내용칸에 미리 채워주는 틀(예: Story/Feelings/Decisions/... 회고 양식).
    # 사용자가 직접 타이핑을 시작하면 더 이상 덮어쓰지 않는다(프론트에서 처리).
    content_template: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(server_default=func.now(), nullable=False)

    entries: Mapped[list["JournalEntry"]] = relationship(
        back_populates="category", cascade="all, delete-orphan", passive_deletes=True
    )


class JournalEntry(Base):
    __tablename__ = "journal_entry"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("user.id", ondelete="CASCADE"), nullable=False)
    category_id: Mapped[int] = mapped_column(
        ForeignKey("journal_category.id", ondelete="CASCADE"), nullable=False
    )
    entry_date: Mapped[date] = mapped_column(Date, nullable=False)
    title: Mapped[str | None] = mapped_column(String(200), nullable=True)
    content: Mapped[str] = mapped_column(Text, nullable=False)
    created_at: Mapped[datetime] = mapped_column(server_default=func.now(), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        server_default=func.now(), onupdate=func.now(), nullable=False
    )

    category: Mapped["JournalCategory"] = relationship(back_populates="entries")
    tags: Mapped[list["JournalTag"]] = relationship(
        secondary=journal_entry_tag, back_populates="entries"
    )
    moods: Mapped[list["JournalEntryMood"]] = relationship(
        back_populates="entry", cascade="all, delete-orphan", passive_deletes=True
    )
    attachments: Mapped[list["JournalAttachment"]] = relationship(
        back_populates="entry", cascade="all, delete-orphan", passive_deletes=True
    )


class JournalEntryMood(Base):
    """엔트리 하나에 여러 감정을 태그처럼 붙일 수 있게 하는 연결 테이블. mood 자체가 고정 enum이라
    JournalTag처럼 별도 엔티티(이름 등)를 둘 필요가 없어 journal_entry_tag와 달리 값 자체를 PK로 쓴다."""

    __tablename__ = "journal_entry_mood"

    entry_id: Mapped[int] = mapped_column(ForeignKey("journal_entry.id", ondelete="CASCADE"), primary_key=True)
    mood: Mapped[JournalMood] = mapped_column(
        Enum(JournalMood, native_enum=False, length=20, values_callable=_by_value), primary_key=True
    )

    entry: Mapped["JournalEntry"] = relationship(back_populates="moods")


class JournalTag(Base):
    __tablename__ = "journal_tag"
    __table_args__ = (UniqueConstraint("user_id", "name", name="uq_journal_tag_user_name"),)

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("user.id", ondelete="CASCADE"), nullable=False)
    name: Mapped[str] = mapped_column(String(50), nullable=False)

    entries: Mapped[list["JournalEntry"]] = relationship(
        secondary=journal_entry_tag, back_populates="tags"
    )


class JournalAttachment(Base):
    __tablename__ = "journal_attachment"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    entry_id: Mapped[int] = mapped_column(ForeignKey("journal_entry.id", ondelete="CASCADE"), nullable=False)
    media_type: Mapped[JournalAttachmentType] = mapped_column(
        Enum(JournalAttachmentType, native_enum=False, length=10, values_callable=_by_value), nullable=False
    )
    file_path: Mapped[str] = mapped_column(String(500), nullable=False)
    thumbnail_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
    original_filename: Mapped[str] = mapped_column(String(255), nullable=False)
    file_size: Mapped[int] = mapped_column(Integer, nullable=False)
    created_at: Mapped[datetime] = mapped_column(server_default=func.now(), nullable=False)

    entry: Mapped["JournalEntry"] = relationship(back_populates="attachments")


class JournalPrompt(Base):
    """카테고리 무관 전역 질문 뱅크. 특정 카테고리 전용 프롬프트는 v1 범위 밖(향후 확장 여지)."""

    __tablename__ = "journal_prompt"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    question_text: Mapped[str] = mapped_column(String(300), nullable=False)