from django.contrib import admin, messages
from django.db import models
from django.forms import TextInput

from inline_actions.admin import (
    InlineActionsMixin, InlineActionsModelAdminMixin
)

from .actions import change_items, publish_items, remove_items
from .models import Album, Artist, Game, Song, Store
from profiles.exceptions import MakeRequestError
from profiles.models import RadioProfile


class RequestSongActionMixin(object):
    '''This allows a song to be requested directly from an admin page.'''
    def get_inline_actions(self, request, obj=None):
        actions = super().get_inline_actions(request=request, obj=obj)
        actions.append('request_song')
        return actions

    def request_song(self, request, obj, parent_obj=None):
        profile = RadioProfile.objects.get(user=request.user)

        # This is to get around the M2M 'through' table on Artists
        song = obj
        if not isinstance(song, Song):
            song = obj.song

        try:
            profile.make_request(song)
        except MakeRequestError as e:
            return messages.error(
                request, 
                'Unable to request the song: {}'.format(str(e))
            )
        return messages.success(request, 'Successfully queued song.')

    def get_request_song_label(self, obj):
        return 'Request Song'


class ArtistInline(admin.TabularInline):
    model = Song.artists.through
    verbose_name = 'artist'
    verbose_name_plural = 'artists'
    extra = 0


class StoreInline(admin.TabularInline):
    model = Song.stores.through
    verbose_name = 'data store'
    verbose_name_plural = 'data stores'
    extra = 0


class SongInline(RequestSongActionMixin,
                 InlineActionsMixin,
                 admin.TabularInline):
    model = Song
    readonly_fields = (
        'title',
        'game',
        'album',
        'artist_list',
        '_is_enabled',
        '_is_published',
        '_is_requestable'
    )
    fields = readonly_fields
    verbose_name = 'related song'
    verbose_name_plural = 'related songs'
    extra = 0

    def artist_list(self, obj):
        return ', '.join([a.full_name for a in obj.artists.all()])

class SongArtistInline(SongInline):
    model = Song.artists.through

    # This is VERY hacky and I hate it. I would love to find something
    # a little more DRY. There's this:
    # https://gist.github.com/cauethenorio/9db40c59cf406bf328fd
    # . . .but it seems to be aimed at ModelAdmins, not Inlines. Maybe a
    # refactor is in order when I understand the underlying functionality
    # down the road.

    def title(self, obj):
        return obj.song.title
    title.short_description = 'title'

    def game(self, obj):
        return obj.song.game
    game.short_description = 'game'

    def album(self, obj):
        return obj.song.album
    album.short_description = 'album'

    def artist_list(self, obj):
        return ', '.join([a.full_name for a in obj.song.artists.all()])

    def _is_enabled(self, obj):
        return obj.song.is_enabled
    _is_enabled.boolean = True

    def _is_published(self, obj):
        return obj.song.is_published
    _is_published.boolean = True

    def _is_requestable(self, obj):
        return obj.song.is_requestable
    _is_requestable.boolean = True


@admin.register(Album)
class AlbumAdmin(InlineActionsModelAdminMixin, admin.ModelAdmin):
    # Detail List display
    list_display = ('title', '_is_enabled', '_is_published')
    search_fields = ['title']
    actions = ['publish_albums']
    inlines = [SongInline]

    # Edit Form display
    readonly_fields = ('created_date', 'modified_date')
    fieldsets = (
        ('Album Disabling', {
            'classes': ('collapse',),
            'fields': ('disabled', 'disabled_date', 'disabled_reason')
        }),
        ('Main', {
            'fields': ('title', 'published_date')
        }),
        ('Stats', {
            'classes': ('collapse',),
            'fields': ('created_date', 'modified_date')
        })
    )

    def publish_albums(self, request, queryset):
        publish_items(request, queryset)
    publish_albums.short_description = "Publish selected albums"

    class Media:
        css = {
            'all': ('css/remove_inline_object_names.css', )
        }


@admin.register(Artist)
class ArtistAdmin(InlineActionsModelAdminMixin, admin.ModelAdmin):
    # Detail List display
    list_display = ('first_name',
                    'alias',
                    'last_name',
                    '_is_enabled',
                    '_is_published')
    search_fields = ['first_name', 'alias', 'last_name']
    actions = ['publish_artists']
    inlines = [SongArtistInline]

    # Edit Form display
    readonly_fields = ('created_date', 'modified_date')
    fieldsets = (
        ('Artist Disabling', {
            'classes': ('collapse',),
            'fields': ('disabled', 'disabled_date', 'disabled_reason')
        }),
        ('Main', {
            'fields': ('first_name', 'alias', 'last_name', 'published_date')
        }),
        ('Stats', {
            'classes': ('collapse',),
            'fields': ('created_date', 'modified_date')
        })
    )

    def publish_artists(self, request, queryset):
        publish_items(request, queryset)
    publish_artists.short_description = "Publish selected artists"

    class Media:
        css = {
            'all': ('css/remove_inline_object_names.css', )
        }


@admin.register(Game)
class GameAdmin(InlineActionsModelAdminMixin, admin.ModelAdmin):
    # Detail List display
    list_display = ('title', '_is_enabled', '_is_published')
    search_fields = ['title']
    actions = ['publish_games']
    inlines = [SongInline]

    # Edit Form display
    readonly_fields = ('created_date', 'modified_date')
    fieldsets = (
        ('Game Disabling', {
            'classes': ('collapse',),
            'fields': ('disabled', 'disabled_date', 'disabled_reason')
        }),
        ('Main', {
            'fields': ('title', 'published_date')
        }),
        ('Stats', {
            'classes': ('collapse',),
            'fields': ('created_date', 'modified_date')
        })
    )

    def publish_games(self, request, queryset):
        publish_items(request, queryset)
    publish_games.short_description = "Publish selected games"

    class Media:
        css = {
            'all': ('css/remove_inline_object_names.css', )
        }


@admin.register(Store)
class StoreAdmin(admin.ModelAdmin):
    # Detail List display
    list_display = ('iri',
                    'mime_type',
                    'file_size',
                    'length',
                    '_replaygain')
    search_fields = ['iri']

    # Edit Form display
    readonly_fields = ('created_date', 'modified_date')
    fieldsets = (
        ('Main', {
            'fields': ('iri',
                       'mime_type',
                       'file_size',
                       'length',
                       'track_gain',
                       'track_peak')
        }),
        ('Stats', {
            'classes': ('collapse',),
            'fields': ('created_date', 'modified_date')
        })
    )


@admin.register(Song)
class SongAdmin(RequestSongActionMixin,
                InlineActionsModelAdminMixin,
                admin.ModelAdmin):
    formfield_overrides = {
        models.TextField: {'widget': TextInput(attrs={'size': 160, })},
    }

    # Detail List display
    list_display = ('title',
                    'game',
                    'album',
                    'artist_list',
                    '_is_enabled',
                    '_is_published',
                    '_is_requestable')
    list_select_related = True
    search_fields = ['title']
    actions = ['publish_songs',
               'add_game', 'remove_game',
               'add_album', 'remove_album',
               'add_artists', 'remove_artists']

    # Edit Form display
    exclude = ('artists',)
    readonly_fields = ('last_played',
                       'num_played',
                       'created_date',
                       'modified_date',
                       'next_play')
    fieldsets = (
        ('Song Disabling', {
            'classes': ('collapse',),
            'fields': ('disabled', 'disabled_date', 'disabled_reason')
        }),
        ('Main', {
            'fields': ('song_type',
                       'title',
                       'published_date',
                       'active_store')
        }),
        ('Stats', {
            'classes': ('collapse',),
            'fields': ('created_date',
                       'modified_date',
                       'last_played',
                       'num_played',
                       'next_play')
        }),
        ('Album', {
            'fields': ('album',)
        }),
        ('Game', {
            'fields': ('game',)
        })
    )
    inlines = [ArtistInline, StoreInline]

    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == 'active_store':
            kwargs['queryset'] = Store.objects.filter(
                song__pk=request.resolver_match.kwargs['object_id']
            )
        return super().formfield_for_foreignkey(db_field, request, **kwargs)

    # Admin Actions

    def artist_list(self, obj):
        return ', '.join([a.full_name for a in obj.artists.all()])

    def add_album(self, request, queryset):
        return change_items(request, queryset, 'album', 'add_album')
    add_album.short_description = "Add album to selected items"

    def remove_album(self, request, queryset):
        return remove_items(request, queryset, 'album', 'remove_album')
    remove_album.short_description = "Remove album from selected items"

    def add_artists(self, request, queryset):
        return change_items(request, queryset, 'artists', 'add_artists',
                            m2m='artist')
    add_artists.short_description = "Add artists to selected items"

    def remove_artists(self, request, queryset):
        return change_items(request, queryset, 'artists', 'remove_artists',
                            m2m='artist', remove=True)
    remove_artists.short_description = "Remove artists from selected items"

    def add_game(self, request, queryset):
        return change_items(request, queryset, 'game', 'add_game')
    add_game.short_description = "Add game to selected items"

    def remove_game(self, request, queryset):
        return remove_items(request, queryset, 'game', 'remove_game')
    remove_game.short_description = "Remove game from selected items"

    def publish_songs(self, request, queryset):
        publish_items(request, queryset)
    publish_songs.short_description = "Publish selected songs"

    class Media:
        css = {
            'all': ('css/remove_inline_object_names.css', )
        }