from django.contrib import admin
from django.utils.translation import gettext_lazy as _
from .models import DocumentTemplate, ClinicalNote, NoteAddendum, NoteAuditLog


@admin.register(DocumentTemplate)
class DocumentTemplateAdmin(admin.ModelAdmin):
    list_display = ['name', 'category', 'is_active', 'created_by', 'created_at']
    list_filter = ['category', 'is_active', 'created_at']
    search_fields = ['name', 'description', 'content']
    readonly_fields = ['created_at', 'updated_at', 'created_by']
    
    fieldsets = (
        (_('Template Information'), {
            'fields': ('name', 'category', 'description', 'is_active')
        }),
        (_('Content'), {
            'fields': ('content',)
        }),
        (_('Metadata'), {
            'fields': ('created_by', 'created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    def save_model(self, request, obj, form, change):
        if not change:  # If creating new object
            obj.created_by = request.user
        super().save_model(request, obj, form, change)


class NoteAddendumInline(admin.TabularInline):
    model = NoteAddendum
    extra = 0
    readonly_fields = ['author', 'created_at']
    fields = ['reason', 'content', 'author', 'created_at']
    
    def has_delete_permission(self, request, obj=None):
        return False


class NoteAuditLogInline(admin.TabularInline):
    model = NoteAuditLog
    extra = 0
    readonly_fields = ['action', 'user', 'timestamp', 'ip_address', 'changes']
    fields = ['action', 'user', 'timestamp', 'ip_address']
    
    def has_add_permission(self, request, obj=None):
        return False
    
    def has_delete_permission(self, request, obj=None):
        return False


@admin.register(ClinicalNote)
class ClinicalNoteAdmin(admin.ModelAdmin):
    list_display = ['title', 'patient', 'status', 'author', 'created_at', 'finalized_at']
    list_filter = ['status', 'created_at', 'finalized_at']
    search_fields = ['title', 'content', 'patient__first_name', 'patient__last_name', 'patient__patient_id']
    readonly_fields = ['author', 'created_at', 'updated_at', 'finalized_at', 'finalized_by', 'version']
    inlines = [NoteAddendumInline, NoteAuditLogInline]
    
    fieldsets = (
        (_('Note Information'), {
            'fields': ('patient', 'template', 'title', 'status')
        }),
        (_('Content'), {
            'fields': ('content',)
        }),
        (_('Metadata'), {
            'fields': ('author', 'created_at', 'updated_at', 'version'),
            'classes': ('collapse',)
        }),
        (_('Finalization'), {
            'fields': ('finalized_at', 'finalized_by'),
            'classes': ('collapse',)
        }),
        (_('Versioning'), {
            'fields': ('parent_note',),
            'classes': ('collapse',)
        }),
    )
    
    def save_model(self, request, obj, form, change):
        if not change:  # If creating new object
            obj.author = request.user
        super().save_model(request, obj, form, change)


@admin.register(NoteAddendum)
class NoteAddendumAdmin(admin.ModelAdmin):
    list_display = ['note', 'reason', 'author', 'created_at']
    list_filter = ['created_at']
    search_fields = ['note__title', 'reason', 'content']
    readonly_fields = ['author', 'created_at']
    
    fieldsets = (
        (_('Addendum Information'), {
            'fields': ('note', 'reason')
        }),
        (_('Content'), {
            'fields': ('content',)
        }),
        (_('Metadata'), {
            'fields': ('author', 'created_at'),
            'classes': ('collapse',)
        }),
    )
    
    def save_model(self, request, obj, form, change):
        if not change:  # If creating new object
            obj.author = request.user
        super().save_model(request, obj, form, change)


@admin.register(NoteAuditLog)
class NoteAuditLogAdmin(admin.ModelAdmin):
    list_display = ['note', 'action', 'user', 'timestamp', 'ip_address']
    list_filter = ['action', 'timestamp']
    search_fields = ['note__title', 'user__username']
    readonly_fields = ['note', 'action', 'user', 'timestamp', 'ip_address', 'changes']
    
    def has_add_permission(self, request):
        return False
    
    def has_delete_permission(self, request, obj=None):
        return False