from django import forms
from django.contrib import admin
from django.contrib.contenttypes.models import ContentType
from django.db import models as db_models

from .models import (
    DocumentAccessLink,
    DocumentAttachment,
    DocumentFolder,
    DocumentFolderAccessLink,
    DocumentFolderAttachment,
    DocumentFolderShare,
    DocumentShare,
    DocumentTag,
    DocumentType,
    DocumentValidation,
    DocumentVersion,
    ManagedDocument,
)


@admin.register(DocumentFolder)
class DocumentFolderAdmin(admin.ModelAdmin):
    list_display = ("name", "application_label", "is_predefined", "created_by")
    list_filter = ("is_predefined", "application_label", "thematics")
    search_fields = ("name", "application_label")
    filter_horizontal = ("parent_folders", "thematics")


@admin.register(DocumentType)
class DocumentTypeAdmin(admin.ModelAdmin):
    list_display = ("code", "label")
    search_fields = ("code", "label")


class DocumentTagForm(forms.ModelForm):
    """Limit related_content_types choices to asset models + Project + Intervention."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        allowed = ContentType.objects.filter(
            db_models.Q(app_label='assets') |
            db_models.Q(app_label='projects', model='project') |
            db_models.Q(app_label='interventions', model='intervention')
        ).order_by('app_label', 'model')
        self.fields['related_content_types'].queryset = allowed

    class Meta:
        model = DocumentTag
        fields = '__all__'


@admin.register(DocumentTag)
class DocumentTagAdmin(admin.ModelAdmin):
    form = DocumentTagForm
    list_display = ("name", "slug", "order", "is_unique", "show_in_asset_detail", "display_thematics", "display_related_models")
    list_filter = ("is_unique", "show_in_asset_detail", "thematics")
    search_fields = ("name_fr", "slug")
    filter_horizontal = ("thematics", "related_content_types")
    fieldsets = (
        (None, {
            "fields": ("name_fr", "name_nl", "slug", "order", "is_unique", "show_in_asset_detail"),
        }),
        ("Filtrage", {
            "fields": ("thematics", "related_content_types"),
        }),
        ("Paramètres supplémentaires", {
            "fields": ("extra_params_schema",),
            "description": (
                "Définit les champs supplémentaires affichés dans la modale d'upload quand ce tag est sélectionné. "
                "Format JSON : liste d'objets avec les clés <code>key</code>, <code>label_fr</code>, "
                "<code>label_nl</code>, <code>type</code> (<code>text</code> / <code>number</code> / "
                "<code>textarea</code> / <code>select</code>), <code>required</code> (bool), "
                "<code>placeholder_fr</code>, <code>placeholder_nl</code>. "
                "Pour <code>select</code> : ajouter <code>options</code> (liste d'objets "
                "<code>{\"value\", \"label_fr\", \"label_nl\"}</code>)."
            ),
        }),
    )

    def display_thematics(self, obj):
        return ", ".join([t.name for t in obj.thematics.all()])
    display_thematics.short_description = "Thématiques"

    def display_related_models(self, obj):
        cts = obj.related_content_types.all()
        if not cts:
            return "— (tous)"
        return ", ".join([f"{ct.app_label}.{ct.model}" for ct in cts])
    display_related_models.short_description = "Modèles liés"


class DocumentVersionInline(admin.TabularInline):
    model = DocumentVersion
    fk_name = "document"
    extra = 0
    readonly_fields = ("version_number", "uploaded_by", "upload_date")


@admin.register(ManagedDocument)
class ManagedDocumentAdmin(admin.ModelAdmin):
    list_display = ("title", "created_by", "updated_at", "is_archived")
    list_filter = ("is_archived", "types", "tags")
    search_fields = ("title", "description")
    inlines = [DocumentVersionInline]


@admin.register(DocumentVersion)
class DocumentVersionAdmin(admin.ModelAdmin):
    list_display = ("document", "version_number", "uploaded_by", "upload_date", "status")
    list_filter = ("status",)
    search_fields = ("document__title", "comment")


@admin.register(DocumentValidation)
class DocumentValidationAdmin(admin.ModelAdmin):
    list_display = ("version", "role", "status", "validated_by", "validated_at")
    list_filter = ("status", "role")


@admin.register(DocumentShare)
class DocumentShareAdmin(admin.ModelAdmin):
    list_display = ("document", "user", "permission", "created_at")
    list_filter = ("permission",)


@admin.register(DocumentFolderShare)
class DocumentFolderShareAdmin(admin.ModelAdmin):
    list_display = ("folder", "user", "permission", "created_at")
    list_filter = ("permission",)


@admin.register(DocumentFolderAccessLink)
class DocumentFolderAccessLinkAdmin(admin.ModelAdmin):
    list_display = ("folder", "permission", "expires_at", "created_at")
    list_filter = ("permission",)
    search_fields = ("token",)
    

@admin.register(DocumentAccessLink)
class DocumentAccessLinkAdmin(admin.ModelAdmin):
    list_display = ("document", "permission", "expires_at", "created_at")
    list_filter = ("permission",)
    search_fields = ("token",)


@admin.register(DocumentAttachment)
class DocumentAttachmentAdmin(admin.ModelAdmin):
    list_display = ("document", "content_type", "object_id", "attached_at")
    list_filter = ("content_type",)
    search_fields = ("document__title",)


@admin.register(DocumentFolderAttachment)
class DocumentFolderAttachmentAdmin(admin.ModelAdmin):
    """Admin générique pour voir tous les liens dossier-objet."""
    list_display = ("folder", "content_type", "object_id", "get_object_display", "is_default", "attached_at")
    list_filter = ("is_default", "content_type", "folder")
    search_fields = ("folder__name",)
    autocomplete_fields = ['folder']
    readonly_fields = ('get_object_display',)

    def get_object_display(self, obj):
        """Affiche l'objet lié."""
        if obj.content_object:
            return str(obj.content_object)
        return f"ID {obj.object_id} (supprimé)"
    get_object_display.short_description = "Objet lié"