from django.contrib import admin
from django.utils.translation import gettext_lazy as _
from unfold.admin import ModelAdmin, TabularInline, StackedInline
from unfold.decorators import display, action

from apps.profiles.models import (
    Region,
    Institution,
    InstitutionMember,
    InstitutionTimeline,
    InstitutionMedia,
    InstitutionFollower,
)
from utils.admin import project_admin_site


@admin.register(Region, site=project_admin_site)
class RegionAdmin(ModelAdmin):
    list_display = (
        'name',
        'code',
        'slug',
        'is_active',
        'institutions_count',
        'created_at',
    )
    list_display_links = ('name', 'code', 'slug')
    list_filter = ('is_active', 'created_at')
    search_fields = ('name', 'code', 'description')
    prepopulated_fields = {'slug': ('name',)}
    readonly_fields = ('created_at', 'updated_at', 'institutions_count')

    fieldsets = (
        (_('Region Details'), {
            'fields': ('name', 'slug', 'code', 'is_active', 'description')
        }),
        (_('Timestamps & Statistics'), {
            'fields': ('institutions_count', 'created_at', 'updated_at')
        }),
    )

    @display(description=_('Institutions Count'))
    def institutions_count(self, obj):
        return obj.institutions.count()

    def get_queryset(self, request):
        qs = super().get_queryset(request)
        if request.user.is_superuser or getattr(request.user, 'is_super_admin', False):
            return qs
        if getattr(request.user, 'is_regional_admin', False) and hasattr(request.user, 'managed_regions'):
            return qs.filter(id__in=request.user.managed_regions.all())
        return qs


class InstitutionMemberInline(TabularInline):
    model = InstitutionMember
    extra = 0
    fields = ('user', 'role', 'title', 'joined_at')
    readonly_fields = ('joined_at',)


class InstitutionTimelineInline(StackedInline):
    model = InstitutionTimeline
    extra = 0
    fields = ('year', 'title', 'description', 'order')


class InstitutionMediaInline(TabularInline):
    model = InstitutionMedia
    extra = 0
    fields = ('file', 'media_type', 'title', 'uploaded_at')
    readonly_fields = ('uploaded_at',)


@admin.register(Institution, site=project_admin_site)
class InstitutionAdmin(ModelAdmin):
    list_display = (
        'name',
        'type_badge',
        'region_display',
        'city',
        'country',
        'verification_badge',
        'follower_count',
        'is_featured',
        'is_active',
        'created_at',
    )
    list_display_links = ('name', 'type_badge', 'city', 'country')
    list_filter = ('region', 'type', 'verification_status', 'is_featured', 'is_active', 'country')
    search_fields = ('name', 'region__name', 'city', 'country', 'description', 'email', 'phone')
    prepopulated_fields = {'slug': ('name',)}
    readonly_fields = ('follower_count', 'created_at', 'updated_at')
    inlines = [InstitutionMemberInline, InstitutionTimelineInline, InstitutionMediaInline]
    actions = ['approve_institutions', 'reject_institutions', 'toggle_featured']

    def get_queryset(self, request):
        qs = super().get_queryset(request)
        if request.user.is_superuser or getattr(request.user, 'is_super_admin', False):
            return qs
        if getattr(request.user, 'is_regional_admin', False) and hasattr(request.user, 'managed_regions'):
            return qs.filter(region__in=request.user.managed_regions.all())
        return qs

    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == "region":
            if not (request.user.is_superuser or getattr(request.user, 'is_super_admin', False)) and getattr(request.user, 'is_regional_admin', False) and hasattr(request.user, 'managed_regions'):
                kwargs["queryset"] = request.user.managed_regions.all()
        return super().formfield_for_foreignkey(db_field, request, **kwargs)

    def has_change_permission(self, request, obj=None):
        if not super().has_change_permission(request, obj):
            return False
        if obj is not None and not (request.user.is_superuser or getattr(request.user, 'is_super_admin', False)) and getattr(request.user, 'is_regional_admin', False):
            if hasattr(request.user, 'can_manage_region'):
                return request.user.can_manage_region(obj.region)
        return True

    def has_delete_permission(self, request, obj=None):
        if not super().has_delete_permission(request, obj):
            return False
        if obj is not None and not (request.user.is_superuser or getattr(request.user, 'is_super_admin', False)) and getattr(request.user, 'is_regional_admin', False):
            if hasattr(request.user, 'can_manage_region'):
                return request.user.can_manage_region(obj.region)
        return True

    fieldsets = (
        (_('Identity & Classification'), {
            'fields': ('name', 'slug', 'type', 'is_featured', 'is_active', 'created_by')
        }),
        (_('Location & Geo-Coordinates'), {
            'fields': ('region', 'country', 'city', 'address', 'latitude', 'longitude')
        }),
        (_('Contact & Official Channels'), {
            'fields': ('email', 'phone', 'website', 'established_year')
        }),
        (_('Media & Branding'), {
            'fields': ('avatar', 'cover_image')
        }),
        (_('Structured JSON Metadata'), {
            'fields': ('description', 'social_media', 'working_hours', 'tags')
        }),
        (_('Verification & Statistics'), {
            'fields': ('verification_status', 'follower_count', 'created_at', 'updated_at')
        }),
    )

    @display(description=_('Region'))
    def region_display(self, obj):
        return obj.region.name if obj.region else "-"

    @display(description=_('Type'))
    def type_badge(self, obj):
        return obj.get_type_display()

    @display(description=_('Verification'), label={
        Institution.VerificationStatus.APPROVED: "success",
        Institution.VerificationStatus.PENDING: "warning",
        Institution.VerificationStatus.REJECTED: "danger",
    })
    def verification_badge(self, obj):
        return obj.get_verification_status_display()

    @action(description=_('Approve and verify selected institutions'))
    def approve_institutions(self, request, queryset):
        count = queryset.update(verification_status=Institution.VerificationStatus.APPROVED)
        self.message_user(request, _(f"{count} institution(s) approved and verified."))

    @action(description=_('Reject selected institutions'))
    def reject_institutions(self, request, queryset):
        count = queryset.update(verification_status=Institution.VerificationStatus.REJECTED)
        self.message_user(request, _(f"{count} institution(s) marked as rejected."))

    @action(description=_('Toggle featured status for selected institutions'))
    def toggle_featured(self, request, queryset):
        for item in queryset:
            item.is_featured = not item.is_featured
            item.save(update_fields=['is_featured'])
        self.message_user(request, _("Featured status updated for selected institutions."))


@admin.register(InstitutionMember, site=project_admin_site)
class InstitutionMemberAdmin(ModelAdmin):
    list_display = ('user', 'institution', 'role_badge', 'title', 'joined_at')
    list_display_links = ('user', 'institution', 'title')
    list_filter = ('role', 'joined_at')
    search_fields = ('user__email', 'user__fullname', 'institution__name', 'title')
    readonly_fields = ('joined_at',)

    @display(description=_('Role'), label={
        InstitutionMember.MemberRole.ADMIN: "danger",
        InstitutionMember.MemberRole.EDITOR: "warning",
        InstitutionMember.MemberRole.VIEWER: "info",
    })
    def role_badge(self, obj):
        return obj.get_role_display()


@admin.register(InstitutionTimeline, site=project_admin_site)
class InstitutionTimelineAdmin(ModelAdmin):
    list_display = ('institution', 'year', 'title', 'order', 'created_at')
    list_display_links = ('institution', 'title', 'year')
    search_fields = ('institution__name', 'title', 'description', 'year')
    list_filter = ('created_at',)


@admin.register(InstitutionMedia, site=project_admin_site)
class InstitutionMediaAdmin(ModelAdmin):
    list_display = ('institution', 'title', 'media_type', 'uploaded_at')
    list_display_links = ('institution', 'title')
    list_filter = ('media_type', 'uploaded_at')
    search_fields = ('institution__name', 'title', 'caption')


@admin.register(InstitutionFollower, site=project_admin_site)
class InstitutionFollowerAdmin(ModelAdmin):
    list_display = ('user', 'institution', 'created_at')
    list_display_links = ('user', 'institution')
    search_fields = ('user__email', 'user__fullname', 'institution__name')
    readonly_fields = ('created_at',)