from django.db import models
from django.contrib import admin
from django.db.models import fields


class Unit(models.Model):

    class Meta:
        ordering = ('name',)

    name = fields.CharField(max_length=100)
    abbreviation = fields.CharField(max_length=10, blank=True, null=True)

    def __unicode__(self):
        return "{0} ({1})".format(self.name, self.abbreviation)


class Recipe(models.Model):

    class Meta:
        ordering = ('title',)

    title = fields.CharField(max_length=100)
    slug = fields.SlugField(max_length=150)
    description = fields.TextField(blank=True, null=True)
    servings = fields.IntegerField(blank=True, null=True)
    instructions = fields.TextField()
    oven_temp = fields.IntegerField(blank=True, null=True)
    cook_time = fields.IntegerField(blank=True, null=True, help_text="In minutes")
    prep_time = fields.IntegerField(blank=True, null=True, help_text="In minutes")

    def __unicode__(self):
        return self.title


class Ingredient(models.Model):

    class Meta:
        ordering = ('name',)

    name = fields.CharField(max_length=100, unique=True)

    def __unicode__(self):
        return self.name


class RecipeIngredient(models.Model):

    ingredient = models.ForeignKey(Ingredient)
    units = models.ForeignKey(Unit)
    quantity = fields.FloatField()
    recipe = models.ForeignKey(Recipe)

    def __unicode__(self):
        return "{0} in {1}".format(self.ingredient.name, self.recipe.title)


class UnitAdmin(admin.ModelAdmin):

    list_display = ('name', 'abbreviation')
    ordering = ('name',)


class IngredientInline(admin.TabularInline):

    model = RecipeIngredient
    extra = 12


class RecipeAdmin(admin.ModelAdmin):

    list_display = ('title',)
    inlines = (IngredientInline,)
    search_fields = ('title',)
    prepopulated_fields = { "slug": ("title",) }


class IngredientAdmin(admin.ModelAdmin):

    list_display = ('name',)
    search_fields = ('name',)


try:
    admin.site.register(Unit, UnitAdmin)
    admin.site.register(Ingredient, IngredientAdmin)
    admin.site.register(Recipe, RecipeAdmin)
except admin.sites.AlreadyRegistered:
    pass