# models.py
# All SQLAlchemy database models

from extensions import db
from datetime import datetime


class User(db.Model):
    __tablename__ = "users"

    id             = db.Column(db.Integer, primary_key=True)
    name           = db.Column(db.String(100), nullable=False)
    email          = db.Column(db.String(255), nullable=False, unique=True)
    password       = db.Column(db.String(255), nullable=False)
    student_id     = db.Column(db.String(50),  nullable=False, unique=True)
    bio            = db.Column(db.Text,         default=None)
    department     = db.Column(db.String(100),  default=None)
    profile_image  = db.Column(db.String(255),  default=None)
    cover_image    = db.Column(db.String(255),  default=None)
    is_admin       = db.Column(db.Boolean,       default=False)
    location_city  = db.Column(db.String(100),  default=None)
    location_country = db.Column(db.String(100), default=None)
    location_lat   = db.Column(db.Numeric(10,8), default=None)
    location_lng   = db.Column(db.Numeric(11,8), default=None)
    feeling        = db.Column(db.String(50),   default=None)
    feeling_emoji  = db.Column(db.String(10),   default=None)
    created_at     = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at     = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    def to_dict(self):
        return {
            "id":               self.id,
            "name":             self.name,
            "email":            self.email,
            "student_id":       self.student_id,
            "bio":              self.bio,
            "department":       self.department,
            "profile_image":    self.profile_image,
            "cover_image":      self.cover_image,
            "is_admin":         self.is_admin,
            "feeling":          self.feeling,
            "feeling_emoji":    self.feeling_emoji,
            "location_city":    self.location_city,
            "location_country": self.location_country,
        }


class Post(db.Model):
    __tablename__ = "posts"

    id            = db.Column(db.Integer, primary_key=True)
    user_id       = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    content       = db.Column(db.Text,    nullable=False)
    image         = db.Column(db.String(255), default=None)
    feeling       = db.Column(db.String(50),  default=None)
    feeling_emoji = db.Column(db.String(10),  default=None)
    location_city = db.Column(db.String(100), default=None)
    location_lat  = db.Column(db.Numeric(10,8), default=None)
    location_lng  = db.Column(db.Numeric(11,8), default=None)
    sentiment     = db.Column(db.String(20),  default=None)   # POSITIVE | NEGATIVE | NEUTRAL
    sentiment_score = db.Column(db.Float,     default=None)
    created_at    = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at    = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    def to_dict(self, like_count=0, comment_count=0, user_liked=False, author=None):
        return {
            "id":              self.id,
            "user_id":         self.user_id,
            "author":          author,
            "content":         self.content,
            "image":           self.image,
            "feeling":         self.feeling,
            "feeling_emoji":   self.feeling_emoji,
            "sentiment":       self.sentiment,
            "sentiment_score": self.sentiment_score,
            "likes":           like_count,
            "comments":        comment_count,
            "user_liked":      user_liked,
            "created_at":      self.created_at.isoformat(),
        }


class Comment(db.Model):
    __tablename__ = "comments"

    id         = db.Column(db.Integer, primary_key=True)
    post_id    = db.Column(db.Integer, db.ForeignKey("posts.id",    ondelete="CASCADE"), nullable=False)
    user_id    = db.Column(db.Integer, db.ForeignKey("users.id",    ondelete="CASCADE"), nullable=False)
    parent_id  = db.Column(db.Integer, db.ForeignKey("comments.id", ondelete="CASCADE"), default=None)
    content    = db.Column(db.Text, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)


class Like(db.Model):
    __tablename__ = "likes"

    id         = db.Column(db.Integer, primary_key=True)
    post_id    = db.Column(db.Integer, db.ForeignKey("posts.id",  ondelete="CASCADE"), nullable=False)
    user_id    = db.Column(db.Integer, db.ForeignKey("users.id",  ondelete="CASCADE"), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    __table_args__ = (db.UniqueConstraint("post_id", "user_id"),)


class FriendRequest(db.Model):
    __tablename__ = "friend_requests"

    id          = db.Column(db.Integer, primary_key=True)
    sender_id   = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    receiver_id = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    status      = db.Column(db.String(20), default="pending")   # pending | accepted | rejected
    created_at  = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at  = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    __table_args__ = (db.UniqueConstraint("sender_id", "receiver_id"),)


class Friend(db.Model):
    __tablename__ = "friends"

    id         = db.Column(db.Integer, primary_key=True)
    user_id    = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    friend_id  = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    __table_args__ = (db.UniqueConstraint("user_id", "friend_id"),)


class Announcement(db.Model):
    __tablename__ = "announcements"

    id         = db.Column(db.Integer, primary_key=True)
    admin_id   = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    title      = db.Column(db.String(255), nullable=False)
    content    = db.Column(db.Text, nullable=False)
    priority   = db.Column(db.String(20), default="normal")   # low | normal | high
    created_at = db.Column(db.DateTime, default=datetime.utcnow)


class Message(db.Model):
    __tablename__ = "messages"

    id          = db.Column(db.Integer, primary_key=True)
    sender_id   = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    receiver_id = db.Column(db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
    message     = db.Column(db.Text, nullable=False)
    is_read     = db.Column(db.Boolean, default=False)
    created_at  = db.Column(db.DateTime, default=datetime.utcnow)