from django.contrib import admin
from simple_history.admin import SimpleHistoryAdmin
from django.utils.html import format_html
from django.utils.safestring import mark_safe
from .models import Process, ProcessStep, ProcessInstance, StepInstance, StepDependency, StepRejection, StepRevision

@admin.register(Process)
class ProcessAdmin(SimpleHistoryAdmin):
    list_display = ['name', 'is_active', 'created_by', 'created', 'steps_count']
    list_filter = ['is_active', 'created']
    search_fields = ['name', 'description', 'created_by__username']
    prepopulated_fields = {'slug': ('name',)}
    readonly_fields = ['deleted_at', 'created', 'updated']
    
    def steps_count(self, obj):
        return obj.steps.count()
    steps_count.short_description = "تعداد مراحل"

@admin.register(ProcessStep)
class ProcessStepAdmin(SimpleHistoryAdmin):
    list_display = ['name', 'process', 'order', 'is_required', 'dependencies_display', 'blocks_previous', 'can_go_back']
    list_filter = ['process', 'is_required', 'blocks_previous', 'can_go_back']
    search_fields = ['name', 'process__name', 'description']
    prepopulated_fields = {'slug': ('name',)}
    readonly_fields = ['deleted_at']
    ordering = ['process', 'order']

    def dependencies_display(self, obj):
        dependencies = obj.get_dependencies()
        if dependencies:
            dependency_names = ProcessStep.objects.filter(id__in=dependencies).values_list('name', flat=True)
            return ", ".join(dependency_names)
        return "بدون وابستگی"
    dependencies_display.short_description = "وابسته به"

@admin.register(StepDependency)
class StepDependencyAdmin(admin.ModelAdmin):
    list_display = ['dependent_step', 'dependency_step', 'process_display', 'created_at']
    list_filter = ['dependent_step__process', 'created_at']
    search_fields = ['dependent_step__name', 'dependency_step__name']
    ordering = ['dependent_step__process', 'dependent_step__order']

    def process_display(self, obj):
        return obj.dependent_step.process.name
    process_display.short_description = "فرآیند"

@admin.register(ProcessInstance)
class ProcessInstanceAdmin(SimpleHistoryAdmin):
    list_display = ['name', 'process', 'requester', 'current_step', 'status', 'started_at', 'progress_display']
    list_filter = ['process', 'status', 'started_at']
    search_fields = ['name', 'process__name', 'requester__username', 'requester__first_name']
    readonly_fields = ['deleted_at', 'started_at', 'completed_at']
    ordering = ['-started_at']

    def progress_display(self, obj):
        total_steps = obj.process.steps.count()
        completed_steps = obj.step_instances.filter(status='completed').count()
        percentage = (completed_steps / total_steps * 100) if total_steps > 0 else 0
        percentage_int = int(percentage)
        return format_html(
            '<div class="progress" style="width: 100px;"><div class="progress-bar" style="width: {}%">{}/{} ({}%)</div></div>',
            percentage_int, completed_steps, total_steps, percentage_int
        )
    progress_display.short_description = "پیشرفت"

@admin.register(StepInstance)
class StepInstanceAdmin(SimpleHistoryAdmin):
    list_display = ['process_instance', 'step', 'assigned_to', 'status_display', 'rejection_count', 'started_at', 'completed_at']
    list_filter = ['status', 'step__process', 'started_at']
    search_fields = ['process_instance__name', 'step__name', 'assigned_to__username']
    readonly_fields = ['started_at', 'completed_at']
    ordering = ['process_instance', 'step__order']

    def status_display(self, obj):
        return mark_safe(obj.get_status_display_with_color())
    status_display.short_description = "وضعیت"

    def rejection_count(self, obj):
        count = obj.get_rejection_count()
        if count > 0:
            return format_html('<span class="badge bg-danger">{}</span>', count)
        return format_html('<span class="badge bg-success">0</span>')
    rejection_count.short_description = "تعداد رد شدن‌ها"

@admin.register(StepRejection)
class StepRejectionAdmin(SimpleHistoryAdmin):
    list_display = ['step_instance', 'rejected_by', 'reason_short', 'created_at']
    list_filter = ['rejected_by', 'created_at', 'step_instance__step__process']
    search_fields = ['step_instance__step__name', 'rejected_by__username', 'reason']
    readonly_fields = ['created_at']
    ordering = ['-created_at']

    def reason_short(self, obj):
        return obj.reason[:50] + "..." if len(obj.reason) > 50 else obj.reason
    reason_short.short_description = "دلیل رد شدن"

@admin.register(StepRevision)
class StepRevisionAdmin(SimpleHistoryAdmin):
    list_display = ['step_instance', 'rejection', 'revised_by', 'changes_short', 'created_at']
    list_filter = ['revised_by', 'created_at', 'step_instance__step__process']
    search_fields = ['step_instance__step__name', 'revised_by__username', 'changes_description']
    readonly_fields = ['created_at']
    ordering = ['-created_at']

    def changes_short(self, obj):
        return obj.changes_description[:50] + "..." if len(obj.changes_description) > 50 else obj.changes_description
    changes_short.short_description = "تغییرات"