"""SQLAlchemy models for OPS Resource Portal."""
from datetime import datetime, timezone

from extensions import db


def utcnow():
    return datetime.now(timezone.utc)


# ---------------------------------------------------------------------------
# Association table: resource <-> option (faceted tagging)
# ---------------------------------------------------------------------------
resource_options = db.Table(
    "resource_options",
    db.Column("resource_id", db.Integer, db.ForeignKey("resources.id", ondelete="CASCADE"), primary_key=True),
    db.Column("option_id", db.Integer, db.ForeignKey("options.id", ondelete="CASCADE"), primary_key=True),
)


class User(db.Model):
    __tablename__ = "users"
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    password = db.Column(db.String(128), nullable=False)  # bcrypt hash
    created_at = db.Column(db.DateTime, default=utcnow)

    def set_password(self, raw):
        import bcrypt
        self.password = bcrypt.hashpw(raw.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")

    def check_password(self, raw):
        import bcrypt
        try:
            return bcrypt.checkpw(raw.encode("utf-8"), self.password.encode("utf-8"))
        except Exception:
            return False


class SiteSetting(db.Model):
    """Key-value site configuration editable from the admin panel."""
    __tablename__ = "site_settings"
    key = db.Column(db.String(64), primary_key=True)
    value = db.Column(db.Text, default="")
    updated_at = db.Column(db.DateTime, default=utcnow, onupdate=utcnow)


class Category(db.Model):
    """Left-nav menu entry, e.g. 基础设备 / pypi源."""
    __tablename__ = "categories"
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(80), nullable=False)
    icon = db.Column(db.String(16), default="📁")          # emoji icon
    description = db.Column(db.String(255), default="")
    sort_order = db.Column(db.Integer, default=0)
    is_active = db.Column(db.Boolean, default=True)
    created_at = db.Column(db.DateTime, default=utcnow)

    rows = db.relationship("OptionRow", backref="category", lazy=True,
                           cascade="all, delete-orphan", order_by="OptionRow.sort_order")
    resources = db.relationship("Resource", backref="category", lazy=True,
                                cascade="all, delete-orphan")

    def to_dict(self, with_rows=True):
        d = {
            "id": self.id, "name": self.name, "icon": self.icon,
            "description": self.description, "sort_order": self.sort_order,
            "is_active": self.is_active,
            "resource_count": len(self.resources),
        }
        if with_rows:
            d["rows"] = [r.to_dict() for r in self.rows]
        return d


class OptionRow(db.Model):
    """A selection row inside a category, e.g. 运行环境 / 操作系统."""
    __tablename__ = "option_rows"
    id = db.Column(db.Integer, primary_key=True)
    category_id = db.Column(db.Integer, db.ForeignKey("categories.id", ondelete="CASCADE"), nullable=False)
    title = db.Column(db.String(80), nullable=False)       # e.g. 运行环境
    sort_order = db.Column(db.Integer, default=0)

    options = db.relationship("Option", backref="row", lazy=True,
                              cascade="all, delete-orphan", order_by="Option.sort_order")

    def to_dict(self):
        return {
            "id": self.id, "title": self.title, "sort_order": self.sort_order,
            "options": [o.to_dict() for o in self.options],
        }


class Option(db.Model):
    """A selectable tile inside a row, e.g. 物理机 / ubuntu."""
    __tablename__ = "options"
    id = db.Column(db.Integer, primary_key=True)
    row_id = db.Column(db.Integer, db.ForeignKey("option_rows.id", ondelete="CASCADE"), nullable=False)
    label = db.Column(db.String(80), nullable=False)
    icon = db.Column(db.String(16), default="")
    sort_order = db.Column(db.Integer, default=0)

    def to_dict(self):
        return {"id": self.id, "label": self.label, "icon": self.icon, "sort_order": self.sort_order}


class Resource(db.Model):
    """A published internal resource: command / link / text / file."""
    __tablename__ = "resources"
    id = db.Column(db.Integer, primary_key=True)
    category_id = db.Column(db.Integer, db.ForeignKey("categories.id", ondelete="CASCADE"), nullable=False)
    title = db.Column(db.String(160), nullable=False)
    type = db.Column(db.String(16), nullable=False, default="command")  # command|link|text|file
    content = db.Column(db.Text, default="")      # command text / rich text / note
    url = db.Column(db.String(500), default="")   # link target / file URL
    description = db.Column(db.String(255), default="")
    sort_order = db.Column(db.Integer, default=0)
    is_active = db.Column(db.Boolean, default=True)
    created_at = db.Column(db.DateTime, default=utcnow)
    updated_at = db.Column(db.DateTime, default=utcnow, onupdate=utcnow)

    options = db.relationship("Option", secondary=resource_options, lazy="subquery",
                              backref=db.backref("resources", lazy=True))

    def to_dict(self):
        return {
            "id": self.id, "category_id": self.category_id, "title": self.title,
            "type": self.type, "content": self.content, "url": self.url,
            "description": self.description, "sort_order": self.sort_order,
            "is_active": self.is_active,
            "option_ids": sorted(o.id for o in self.options),
            "created_at": self.created_at.strftime("%Y-%m-%d %H:%M") if self.created_at else "",
            "updated_at": self.updated_at.strftime("%Y-%m-%d %H:%M") if self.updated_at else "",
        }


class SideLink(db.Model):
    """Right-panel 其他链接 entry."""
    __tablename__ = "side_links"
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(160), nullable=False)
    url = db.Column(db.String(500), nullable=False)
    group_name = db.Column(db.String(80), default="其他链接")
    sort_order = db.Column(db.Integer, default=0)
    is_active = db.Column(db.Boolean, default=True)
    created_at = db.Column(db.DateTime, default=utcnow)

    def to_dict(self):
        return {
            "id": self.id, "title": self.title, "url": self.url,
            "group_name": self.group_name, "sort_order": self.sort_order,
            "is_active": self.is_active,
        }