# models.py
# -*- coding: utf-8 -*-
from datetime import datetime, date, time
from sqlalchemy import (
    Column, Integer, String, Text, Date, Time, DateTime, Float, ForeignKey, Index
)
from sqlalchemy.orm import declarative_base, relationship

Base = declarative_base()


class Course(Base):
    __tablename__ = "courses"

    id = Column(Integer, primary_key=True, autoincrement=True)
    title = Column(String(255), nullable=False, index=True)
    description = Column(Text, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    lessons = relationship("Lesson", back_populates="course", cascade="all, delete-orphan")
    materials = relationship("Material", back_populates="course", cascade="all, delete-orphan")
    schedule_items = relationship("Schedule", back_populates="course", cascade="all, delete-orphan")
    enrollments = relationship("Enrollment", back_populates="course", cascade="all, delete-orphan")
    grades = relationship("Grade", back_populates="course", cascade="all, delete-orphan")
    certificates = relationship("Certificate", back_populates="course", cascade="all, delete-orphan")
    makeups = relationship("MakeupRequest", back_populates="course", cascade="all, delete-orphan")


class Lesson(Base):
    __tablename__ = "lessons"

    id = Column(Integer, primary_key=True, autoincrement=True)
    course_id = Column(Integer, ForeignKey("courses.id", ondelete="CASCADE"), nullable=False, index=True)
    title = Column(String(255), nullable=False)
    description = Column(Text, nullable=True)
    video_path = Column(Text, nullable=True)  # pode ser URL (YouTube) ou caminho local
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    course = relationship("Course", back_populates="lessons")


class Material(Base):
    __tablename__ = "materials"

    id = Column(Integer, primary_key=True, autoincrement=True)
    course_id = Column(Integer, ForeignKey("courses.id", ondelete="CASCADE"), nullable=False, index=True)
    title = Column(String(255), nullable=False)
    description = Column(Text, nullable=True)
    pdf_path = Column(Text, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    course = relationship("Course", back_populates="materials")


class Schedule(Base):
    __tablename__ = "schedule"

    id = Column(Integer, primary_key=True, autoincrement=True)
    course_id = Column(Integer, ForeignKey("courses.id", ondelete="CASCADE"), nullable=False, index=True)

    class_date = Column(Date, nullable=True)
    start_time = Column(Time, nullable=True)
    end_time = Column(Time, nullable=True)

    # Campo 'topic' guarda JSON/texto com metadados (topic/module_id/assigned_emails/…)
    topic = Column(Text, nullable=True)

    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    course = relationship("Course", back_populates="schedule_items")

# Acelera buscas por data/hora por curso
Index("ix_schedule_course_date", Schedule.course_id, Schedule.class_date, Schedule.start_time)


class Enrollment(Base):
    __tablename__ = "enrollments"

    id = Column(Integer, primary_key=True, autoincrement=True)
    course_id = Column(Integer, ForeignKey("courses.id", ondelete="CASCADE"), nullable=False, index=True)
    student_name = Column(String(255), nullable=True)
    student_email = Column(String(255), nullable=False, index=True)  # armazenar em minúsculas
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    course = relationship("Course", back_populates="enrollments")

# Evita duplicidade de matrícula do mesmo email no mesmo curso (lógica no app faz dedupe também)
Index("ix_enrollment_course_email", Enrollment.course_id, Enrollment.student_email)


class Grade(Base):
    __tablename__ = "grades"

    id = Column(Integer, primary_key=True, autoincrement=True)
    course_id = Column(Integer, ForeignKey("courses.id", ondelete="CASCADE"), nullable=False, index=True)
    student_name = Column(String(255), nullable=True)
    student_email = Column(String(255), nullable=False, index=True)
    grade = Column(Float, nullable=True)
    note = Column(Text, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    course = relationship("Course", back_populates="grades")


class MakeupRequest(Base):
    __tablename__ = "makeup_requests"

    id = Column(Integer, primary_key=True, autoincrement=True)
    course_id = Column(Integer, ForeignKey("courses.id", ondelete="CASCADE"), nullable=False, index=True)
    student_name = Column(String(255), nullable=False)
    student_email = Column(String(255), nullable=False, index=True)
    requested_date = Column(Date, nullable=True)
    note = Column(Text, nullable=True)
    status = Column(String(32), default="pending", nullable=False)  # pending/approved/denied
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    course = relationship("Course", back_populates="makeups")


class Certificate(Base):
    __tablename__ = "certificates"

    id = Column(Integer, primary_key=True, autoincrement=True)
    course_id = Column(Integer, ForeignKey("courses.id", ondelete="CASCADE"), nullable=False, index=True)
    student_name = Column(String(255), nullable=False)
    student_email = Column(String(255), nullable=False, index=True)
    pdf_path = Column(Text, nullable=True)
    issued_at = Column(DateTime, nullable=True, index=True)

    course = relationship("Course", back_populates="certificates")