from django.contrib import admin
from .models import (
    Team, Notification, NotificationAttachment, NotificationRecipient,
    TeamNotificationTarget, TeamNotificationRead,
    Discussion, Message, MessageAttachment,
    NotificationRule,
)


class NotificationRecipientInline(admin.TabularInline):
    model = NotificationRecipient
    extra = 0
    readonly_fields = ['read_at', 'archived_at']


class TeamNotificationTargetInline(admin.TabularInline):
    model = TeamNotificationTarget
    extra = 0


class NotificationAttachmentInline(admin.TabularInline):
    model = NotificationAttachment
    extra = 0
    readonly_fields = ['uploaded_at', 'name']


@admin.register(Team)
class TeamAdmin(admin.ModelAdmin):
    list_display = ['name', 'member_count', 'created_by', 'created_at']
    search_fields = ['name', 'description']
    filter_horizontal = ['members']

    def member_count(self, obj):
        return obj.members.count()
    member_count.short_description = 'Membres'


@admin.register(Notification)
class NotificationAdmin(admin.ModelAdmin):
    list_display = [
        'title', 'notification_type', 'sender',
        'created_at', 'expires_at', 'is_system', 'source_app',
    ]
    list_filter = ['notification_type', 'is_system', 'source_app', 'created_at']
    search_fields = ['title', 'content']
    readonly_fields = ['created_at']
    inlines = [NotificationAttachmentInline, NotificationRecipientInline, TeamNotificationTargetInline]
    date_hierarchy = 'created_at'


@admin.register(NotificationAttachment)
class NotificationAttachmentAdmin(admin.ModelAdmin):
    list_display = ['name', 'notification', 'uploaded_by', 'uploaded_at', 'is_image']
    search_fields = ['name', 'notification__title']
    readonly_fields = ['uploaded_at', 'is_image']


@admin.register(NotificationRecipient)
class NotificationRecipientAdmin(admin.ModelAdmin):
    list_display = ['notification', 'user', 'read_at', 'archived_at']
    list_filter = ['read_at', 'archived_at']
    search_fields = ['user__username', 'notification__title']
    readonly_fields = ['read_at', 'archived_at']


@admin.register(TeamNotificationTarget)
class TeamNotificationTargetAdmin(admin.ModelAdmin):
    list_display = ['notification', 'team']
    search_fields = ['team__name', 'notification__title']


@admin.register(TeamNotificationRead)
class TeamNotificationReadAdmin(admin.ModelAdmin):
    list_display = ['team_notification', 'user', 'read_at']
    search_fields = ['user__username']
    readonly_fields = ['read_at']


# ─────────────────────────────────────────────────────────────────────────────
# Règles de notification
# ─────────────────────────────────────────────────────────────────────────────

@admin.register(NotificationRule)
class NotificationRuleAdmin(admin.ModelAdmin):
    list_display = [
        'name', 'is_active', 'trigger_event', 'trigger_cancellation_type',
        'notification_type', 'team_list', 'updated_at',
    ]
    list_filter = ['is_active', 'trigger_event', 'trigger_cancellation_type', 'notification_type']
    search_fields = ['name', 'title_template', 'content_template']
    filter_horizontal = ['recipient_teams', 'recipient_users']
    readonly_fields = ['created_at', 'updated_at']
    fieldsets = [
        (None, {
            'fields': ['name', 'is_active'],
        }),
        ('Déclencheur', {
            'fields': ['trigger_event', 'trigger_cancellation_type'],
            'description': (
                'Sélectionnez l\'événement qui déclenche cette règle. '
                'Utilisez le filtre « Type d\'annulation » pour ne cibler qu\'un cas précis.'
            ),
        }),
        ('Contenu de la notification', {
            'fields': ['notification_type', 'single_claim', 'title_template', 'content_template'],
            'description': (
                'Variables disponibles dans les modèles : '
                '{intervention_code}, {intervention_title}, '
                '{cancellation_type_label}, {cancellation_reason}'
            ),
        }),
        ('Destinataires', {
            'fields': ['recipient_teams', 'recipient_users'],
        }),
        ('Informations système', {
            'fields': ['created_at', 'updated_at'],
            'classes': ['collapse'],
        }),
    ]

    def team_list(self, obj):
        teams = obj.recipient_teams.select_related('company').values_list('name', 'company__name')
        return ', '.join(f"{n} ({c})" for n, c in teams) or '—'
    team_list.short_description = 'Équipes'


# ─────────────────────────────────────────────────────────────────────────────
# Discussion / Messaging
# ─────────────────────────────────────────────────────────────────────────────

class MessageInline(admin.TabularInline):
    model = Message
    extra = 0
    readonly_fields = ['created_at', 'author']
    fields = ['author', 'content', 'created_at', 'is_deleted']


@admin.register(Discussion)
class DiscussionAdmin(admin.ModelAdmin):
    list_display = ['title', 'created_by', 'created_at', 'updated_at', 'is_closed', 'object_label', 'message_count']
    list_filter = ['is_closed', 'created_at']
    search_fields = ['title', 'object_label', 'created_by__username']
    readonly_fields = ['created_at', 'updated_at', 'content_type', 'object_id', 'object_url', 'object_label']
    filter_horizontal = ['participants']
    inlines = [MessageInline]

    def message_count(self, obj):
        return obj.messages.filter(is_deleted=False).count()
    message_count.short_description = 'Messages'


class MessageAttachmentInline(admin.TabularInline):
    model = MessageAttachment
    extra = 0
    readonly_fields = ['uploaded_at', 'name', 'is_image']


@admin.register(Message)
class MessageAdmin(admin.ModelAdmin):
    list_display = ['author', 'discussion', 'created_at', 'is_deleted']
    list_filter = ['is_deleted', 'created_at']
    search_fields = ['author__username', 'content', 'discussion__title']
    readonly_fields = ['created_at']
    inlines = [MessageAttachmentInline]