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

from apps.cms.models.post import (
    PostCategory,
    PostTag,
    Post,
    PostRevision,
    PostComment,
    PostLike,
    MediaAsset,
)
from utils.admin import project_admin_site


class PostRevisionInline(TabularInline):
    model = PostRevision
    extra = 0
    fields = ('id', 'author', 'title', 'status', 'reviewed_by', 'reviewed_at', 'created_at')
    readonly_fields = ('id', 'author', 'title', 'status', 'reviewed_by', 'reviewed_at', 'created_at')
    show_change_link = True


class PostCommentInline(TabularInline):
    model = PostComment
    extra = 0
    fields = ('author_name', 'author_email', 'user', 'content', 'status', 'created_at')
    readonly_fields = ('created_at',)


@admin.register(Post, site=project_admin_site)
class PostAdmin(ModelAdmin):
    list_display = (
        'title',
        'post_type_badge',
        'language',
        'category',
        'status_badge',
        'author_type',
        'author',
        'institution',
        'views_count',
        'likes_count',
        'is_featured',
        'publish_date',
    )
    list_display_links = ('title', 'post_type_badge', 'category', 'author')
    list_filter = ('post_type', 'author_type', 'language', 'status', 'is_featured', 'category', 'institution')
    search_fields = ('title', 'excerpt', 'content', 'author__email', 'author__fullname', 'institution__name')
    prepopulated_fields = {'slug': ('title',)}
    readonly_fields = ('reading_time_minutes', 'views_count', 'likes_count', 'reviewed_at', 'created_at', 'updated_at')
    inlines = [PostRevisionInline, PostCommentInline]
    actions = ['publish_posts', 'mark_pending_review', 'archive_posts', 'toggle_featured']

    fieldsets = (
        (_('Article Content'), {
            'fields': ('title', 'slug', 'post_type', 'category', 'language', 'status', 'is_featured')
        }),
        (_('Editorial & Moderation'), {
            'fields': ('rejection_reason', 'reviewed_by', 'reviewed_at')
        }),
        (_('Author & Affiliation'), {
            'fields': ('author_type', 'author', 'institution', 'author_role_label', 'author_custom_avatar')
        }),
        (_('Media & Excerpt'), {
            'fields': ('featured_image', 'excerpt', 'content', 'tags')
        }),
        (_('Metrics & Scheduling'), {
            'fields': ('reading_time_minutes', 'views_count', 'likes_count', 'publish_date', 'created_at', 'updated_at')
        }),
    )

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

    @display(description=_('Status'), label={
        Post.Status.PUBLISHED: "success",
        Post.Status.PENDING_REVIEW: "warning",
        Post.Status.DRAFT: "info",
        Post.Status.REJECTED: "danger",
        Post.Status.ARCHIVED: "secondary",
    })
    def status_badge(self, obj):
        return obj.get_status_display()

    @action(description=_('Publish selected posts'))
    def publish_posts(self, request, queryset):
        count = queryset.update(status=Post.Status.PUBLISHED)
        self.message_user(request, _(f"{count} post(s) published successfully."))

    @action(description=_('Mark selected posts as Pending Review'))
    def mark_pending_review(self, request, queryset):
        count = queryset.update(status=Post.Status.PENDING_REVIEW)
        self.message_user(request, _(f"{count} post(s) marked as pending review."))

    @action(description=_('Archive selected posts'))
    def archive_posts(self, request, queryset):
        count = queryset.update(status=Post.Status.ARCHIVED)
        self.message_user(request, _(f"{count} post(s) archived."))

    @action(description=_('Toggle featured status for selected posts'))
    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."))


@admin.register(PostCategory, site=project_admin_site)
class PostCategoryAdmin(ModelAdmin):
    list_display = ('name', 'slug', 'language', 'created_at')
    list_display_links = ('name', 'slug')
    list_filter = ('language',)
    search_fields = ('name', 'description')
    prepopulated_fields = {'slug': ('name',)}


@admin.register(PostTag, site=project_admin_site)
class PostTagAdmin(ModelAdmin):
    list_display = ('name', 'slug')
    list_display_links = ('name', 'slug')
    search_fields = ('name',)
    prepopulated_fields = {'slug': ('name',)}


@admin.register(PostComment, site=project_admin_site)
class PostCommentAdmin(ModelAdmin):
    list_display = ('author_display', 'post', 'status_badge', 'created_at')
    list_display_links = ('author_display', 'post')
    list_filter = ('status', 'created_at')
    search_fields = ('author_name', 'author_email', 'content', 'post__title')
    actions = ['approve_comments', 'mark_as_spam']

    @display(description=_('Author'))
    def author_display(self, obj):
        return obj.author_name or (obj.user.fullname if obj.user else "Anonymous")

    @display(description=_('Status'), label={
        PostComment.Status.APPROVED: "success",
        PostComment.Status.PENDING: "warning",
        PostComment.Status.SPAM: "danger",
    })
    def status_badge(self, obj):
        return obj.get_status_display()

    @action(description=_('Approve selected comments'))
    def approve_comments(self, request, queryset):
        count = queryset.update(status=PostComment.Status.APPROVED)
        self.message_user(request, _(f"{count} comment(s) approved."))

    @action(description=_('Mark selected comments as spam'))
    def mark_as_spam(self, request, queryset):
        count = queryset.update(status=PostComment.Status.SPAM)
        self.message_user(request, _(f"{count} comment(s) marked as spam."))


@admin.register(PostLike, site=project_admin_site)
class PostLikeAdmin(ModelAdmin):
    list_display = ('user', 'post', 'created_at')
    list_display_links = ('user', 'post')
    search_fields = ('user__email', 'user__fullname', 'post__title')
    readonly_fields = ('created_at',)


@admin.register(MediaAsset, site=project_admin_site)
class MediaAssetAdmin(ModelAdmin):
    list_display = ('title', 'media_type', 'file_size', 'uploaded_by', 'created_at')
    list_display_links = ('title', 'uploaded_by')
    list_filter = ('media_type', 'created_at')
    search_fields = ('title', 'uploaded_by__email')
    readonly_fields = ('created_at',)


@admin.register(PostRevision, site=project_admin_site)
class PostRevisionAdmin(ModelAdmin):
    list_display = ('id', 'post', 'author', 'status_badge', 'created_at', 'reviewed_by', 'reviewed_at')
    list_display_links = ('id', 'post')
    list_filter = ('status', 'created_at')
    search_fields = ('title', 'content', 'author__email', 'post__title')
    readonly_fields = ('created_at', 'updated_at', 'reviewed_at')
    actions = ['approve_revisions']

    @display(description=_('Status'), label={
        PostRevision.Status.APPROVED: "success",
        PostRevision.Status.PENDING: "warning",
        PostRevision.Status.REJECTED: "danger",
    })
    def status_badge(self, obj):
        return obj.get_status_display()

    @action(description=_('Approve and merge selected revisions'))
    def approve_revisions(self, request, queryset):
        count = 0
        for rev in queryset.filter(status=PostRevision.Status.PENDING):
            rev.apply_to_post(editor=request.user)
            count += 1
        self.message_user(request, _(f"{count} revision(s) approved and merged into live posts."))