from django.db import models
from django.contrib import admin
from django.db.models.functions import Now, ExtractWeek, ExtractYear
from django.utils.translation import gettext_lazy as _

# Create your models here.

class CourseTypes(models.TextChoices):
    PPL = "PPL", _("PPL")
    ATPL = "ATPL", _("ATPL")

class Course(models.Model):
    id = models.AutoField(
        primary_key=True
    )

    ctype = models.CharField(
        null=False,
        choices=CourseTypes
    )

    cnumber = models.PositiveSmallIntegerField(
        null=False,
        default=ExtractYear(Now())
    )

    year = models.PositiveSmallIntegerField(
        editable=False,
        db_default=ExtractYear(Now())
    )

    def __str__(self):
        return f"{self.ctype}-{self.cnumber}"

class Student(models.Model):
    id = models.AutoField(
        primary_key=True
    )

    email = models.EmailField(
        null=False,
        db_index=True
    )

    name = models.CharField(
        null=False,
        max_length=32
    )

    surname = models.CharField(
        null=False,
        max_length=32
    )

    course = models.ForeignKey(
        Course,
        on_delete=models.DO_NOTHING,
        null=True
    )

    active = models.BooleanField(
        null=False,
        default=True
    )

    def __str__(self):
        return f"{self.surname} {self.name[0]}. => {self.course}"

class WeekPreference(models.Model):
    id = models.BigAutoField(
        primary_key=True
    )

    week = models.PositiveSmallIntegerField(
        null=False,
        db_index=True,
        default=ExtractWeek(Now()) + 1,
        auto_created=True,
        verbose_name="Week Number"
    )

    student = models.ForeignKey(
        Student,
        null=False,
        db_index=True,
        on_delete=models.DO_NOTHING,
        verbose_name="Student Selection"
    )

    def __str__(self):
        return f"Week {self.week} - {self.student.surname} {self.student.name[0]}."

class MissionType(models.TextChoices):
    OTHER = "OTHER", _("OTHER")
    PPL = "PPL", _("PPL")
    IR = "IR", _("IR")
    CPL = "CPL", _("CPL")
    FI = "FI", _("FI")
    PC = "PC", _("PC")
    CHK = "CHK", _("CHK_6M")

class MissionProfile(models.Model):
    id = models.AutoField(
        primary_key=True
    )

    mtype = models.CharField(
        null=False,
        default=MissionType.PPL,
        choices=MissionType,
        verbose_name="Mission Type"
    )

    mnum = models.PositiveSmallIntegerField(
        null=True,
        default=0,
        verbose_name="Mission Number"
    )

    duration = models.DurationField(
        null=False,
        default=1
    )

    notes = models.TextField(
        max_length=140,
        null=True,
        blank=True
    )

    def __str__(self):
        return f"{self.mtype} {self.mnum}"

class MissionProfileAdmin(admin.ModelAdmin):
    list_display = ("mtype", "mnum")

class AircraftTypes(models.TextChoices):
    C152 = "C152", _("Cessna 152")
    P208 = "P208", _("Tecnam P2008")
    PA28 = "PA28", _("Piper PA28R")
    C182 = "C182", _("Cessna 182Q")
    P210 = "P210", _("Tecnam P2010")

class HourBuilding(models.Model):
    id = models.BigAutoField(
        primary_key=True
    )

    weekpref = models.ForeignKey(
        WeekPreference,
        null=False,
        on_delete=models.CASCADE
    )

    aircraft = models.CharField(
        null=False,
        choices=AircraftTypes
    )

    monday = models.BooleanField(
        default=True,
        null=False
    )

    tuesday = models.BooleanField(
        default=True,
        null=False
    )

    wednesday = models.BooleanField(
        default=True,
        null=False
    )

    thursday = models.BooleanField(
        default=True,
        null=False
    )

    friday = models.BooleanField(
        default=True,
        null=False
    )

    saturday = models.BooleanField(
        default=True,
        null=False
    )

    sunday = models.BooleanField(
        default=True,
        null=False
    )

    notes = models.TextField(
        max_length=140,
        null=True,
        blank=True
    )

class HourBuildingLeg(models.Model):
    id = models.BigAutoField(
        primary_key=True
    )

    hb = models.ForeignKey(
        HourBuilding,
        on_delete=models.CASCADE
    )

    departure = models.CharField(
        null=False,
        blank=False,
        default="LILV",
        max_length=4
    )

    destination = models.CharField(
        null=False,
        blank=False,
        default="LILV",
        max_length=4
    )

    time = models.DurationField(
        null=False,
        default=1
    )

    stop = models.BooleanField(
        default=False
    )

    def __str__(self):
        if self.stop:
            return "Refuelling Stop"
        else:
            return f"Flight Leg: {self.departure} -> {self.destination}"

class Training(models.Model):
    id = models.BigAutoField(
        primary_key=True
    )

    weekpref = models.ForeignKey(
        WeekPreference,
        null=False,
        on_delete=models.CASCADE
    )

    mission = models.ForeignKey(
        MissionProfile,
        null=True,
        on_delete=models.CASCADE
    )

    monday = models.BooleanField(
        default=True,
        null=False
    )

    tuesday = models.BooleanField(
        default=True,
        null=False
    )

    wednesday = models.BooleanField(
        default=True,
        null=False
    )

    thursday = models.BooleanField(
        default=True,
        null=False
    )

    friday = models.BooleanField(
        default=True,
        null=False
    )

    saturday = models.BooleanField(
        default=True,
        null=False
    )

    sunday = models.BooleanField(
        default=True,
        null=False
    )

    notes = models.TextField(
        max_length=140,
        null=True,
        blank=True
    )

    def __str__(self):
        return f"{self.mission}"