"""
Admin configuration for SLA & On-Call Management
"""
from django.contrib import admin
from django.utils.html import format_html
from django.utils import timezone
from datetime import timedelta

from .models import (
    BusinessHours,
    SLADefinition,
    EscalationPolicy,
    OnCallRotation,
    OnCallAssignment,
    SLAInstance,
    EscalationInstance,
    NotificationTemplate,
)


@admin.register(BusinessHours)
class BusinessHoursAdmin(admin.ModelAdmin):
    list_display = ['name', 'timezone', 'weekday_start', 'weekday_end', 'is_active', 'is_default']
    list_filter = ['is_active', 'is_default', 'timezone']
    search_fields = ['name', 'description']
    ordering = ['name']
    
    fieldsets = (
        ('Basic Information', {
            'fields': ('name', 'description', 'timezone')
        }),
        ('Business Hours', {
            'fields': ('weekday_start', 'weekday_end', 'weekend_start', 'weekend_end')
        }),
        ('Overrides', {
            'fields': ('day_overrides', 'holiday_calendar'),
            'classes': ('collapse',)
        }),
        ('Status', {
            'fields': ('is_active', 'is_default')
        }),
        ('Metadata', {
            'fields': ('created_by', 'created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['created_at', 'updated_at']


@admin.register(SLADefinition)
class SLADefinitionAdmin(admin.ModelAdmin):
    list_display = [
        'name', 'sla_type', 'target_duration_minutes', 
        'business_hours_only', 'is_active', 'is_default'
    ]
    list_filter = ['sla_type', 'business_hours_only', 'is_active', 'is_default']
    search_fields = ['name', 'description']
    ordering = ['name']
    
    fieldsets = (
        ('Basic Information', {
            'fields': ('name', 'description', 'sla_type')
        }),
        ('Targeting Criteria', {
            'fields': ('incident_categories', 'incident_severities', 'incident_priorities')
        }),
        ('SLA Configuration', {
            'fields': ('target_duration_minutes', 'business_hours_only', 'business_hours')
        }),
        ('Escalation', {
            'fields': ('escalation_enabled', 'escalation_threshold_percent')
        }),
        ('Status', {
            'fields': ('is_active', 'is_default')
        }),
        ('Metadata', {
            'fields': ('created_by', 'created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['created_at', 'updated_at']


@admin.register(EscalationPolicy)
class EscalationPolicyAdmin(admin.ModelAdmin):
    list_display = [
        'name', 'escalation_type', 'trigger_condition', 
        'trigger_delay_minutes', 'is_active'
    ]
    list_filter = ['escalation_type', 'trigger_condition', 'is_active']
    search_fields = ['name', 'description']
    ordering = ['name']
    
    fieldsets = (
        ('Basic Information', {
            'fields': ('name', 'description', 'escalation_type', 'trigger_condition')
        }),
        ('Targeting', {
            'fields': ('incident_severities', 'incident_categories')
        }),
        ('Configuration', {
            'fields': ('trigger_delay_minutes', 'escalation_steps')
        }),
        ('Notifications', {
            'fields': ('notification_channels', 'notification_templates'),
            'classes': ('collapse',)
        }),
        ('Status', {
            'fields': ('is_active', 'is_default')
        }),
        ('Metadata', {
            'fields': ('created_by', 'created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['created_at', 'updated_at']


@admin.register(OnCallRotation)
class OnCallRotationAdmin(admin.ModelAdmin):
    list_display = [
        'name', 'rotation_type', 'team_name', 'external_system', 'status'
    ]
    list_filter = ['rotation_type', 'external_system', 'status']
    search_fields = ['name', 'team_name', 'description']
    ordering = ['name']
    
    fieldsets = (
        ('Basic Information', {
            'fields': ('name', 'description', 'rotation_type', 'status')
        }),
        ('Team Configuration', {
            'fields': ('team_name', 'team_description')
        }),
        ('Schedule', {
            'fields': ('schedule_config', 'timezone')
        }),
        ('External Integration', {
            'fields': ('external_system', 'external_system_id', 'integration_config'),
            'classes': ('collapse',)
        }),
        ('Metadata', {
            'fields': ('created_by', 'created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['created_at', 'updated_at']


@admin.register(OnCallAssignment)
class OnCallAssignmentAdmin(admin.ModelAdmin):
    list_display = [
        'user', 'rotation', 'start_time', 'end_time', 'status', 'incidents_handled'
    ]
    list_filter = ['status', 'rotation', 'start_time']
    search_fields = ['user__username', 'user__email', 'rotation__name']
    ordering = ['-start_time']
    
    fieldsets = (
        ('Assignment Details', {
            'fields': ('rotation', 'user', 'start_time', 'end_time', 'status')
        }),
        ('Handoff Information', {
            'fields': ('handoff_notes', 'handed_off_from', 'handoff_time'),
            'classes': ('collapse',)
        }),
        ('Performance', {
            'fields': ('incidents_handled', 'response_time_avg')
        }),
        ('Metadata', {
            'fields': ('created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['created_at', 'updated_at']


@admin.register(SLAInstance)
class SLAInstanceAdmin(admin.ModelAdmin):
    list_display = [
        'incident', 'sla_definition', 'status', 'target_time', 
        'escalation_triggered', 'time_remaining_display'
    ]
    list_filter = ['status', 'escalation_triggered', 'sla_definition__sla_type']
    search_fields = ['incident__title', 'sla_definition__name']
    ordering = ['-created_at']
    
    fieldsets = (
        ('SLA Details', {
            'fields': ('sla_definition', 'incident', 'status', 'target_time')
        }),
        ('Timing', {
            'fields': ('started_at', 'met_at', 'breached_at')
        }),
        ('Escalation', {
            'fields': ('escalation_policy', 'escalation_triggered', 
                      'escalation_triggered_at', 'escalation_level')
        }),
        ('Performance', {
            'fields': ('response_time', 'resolution_time')
        }),
        ('Metadata', {
            'fields': ('created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['created_at', 'updated_at', 'started_at']
    
    def time_remaining_display(self, obj):
        """Display time remaining with color coding"""
        if obj.status == 'ACTIVE':
            remaining = obj.time_remaining
            if remaining > timedelta(hours=1):
                color = 'green'
            elif remaining > timedelta(minutes=15):
                color = 'orange'
            else:
                color = 'red'
            
            return format_html(
                '<span style="color: {};">{}</span>',
                color,
                str(remaining).split('.')[0] if remaining else 'Expired'
            )
        return '-'
    time_remaining_display.short_description = 'Time Remaining'


@admin.register(EscalationInstance)
class EscalationInstanceAdmin(admin.ModelAdmin):
    list_display = [
        'incident', 'escalation_policy', 'status', 'escalation_level', 
        'triggered_at', 'current_step'
    ]
    list_filter = ['status', 'escalation_level', 'escalation_policy__escalation_type']
    search_fields = ['incident__title', 'escalation_policy__name']
    ordering = ['-created_at']
    
    fieldsets = (
        ('Escalation Details', {
            'fields': ('escalation_policy', 'incident', 'sla_instance', 'status')
        }),
        ('Progress', {
            'fields': ('escalation_level', 'current_step')
        }),
        ('Timing', {
            'fields': ('triggered_at', 'acknowledged_at', 'resolved_at')
        }),
        ('Actions', {
            'fields': ('notifications_sent', 'actions_taken'),
            'classes': ('collapse',)
        }),
        ('Metadata', {
            'fields': ('created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['created_at', 'updated_at']


@admin.register(NotificationTemplate)
class NotificationTemplateAdmin(admin.ModelAdmin):
    list_display = [
        'name', 'template_type', 'channel_type', 'is_active', 'is_default'
    ]
    list_filter = ['template_type', 'channel_type', 'is_active', 'is_default']
    search_fields = ['name', 'subject_template']
    ordering = ['template_type', 'channel_type', 'name']
    
    fieldsets = (
        ('Basic Information', {
            'fields': ('name', 'template_type', 'channel_type')
        }),
        ('Template Content', {
            'fields': ('subject_template', 'body_template', 'variables')
        }),
        ('Status', {
            'fields': ('is_active', 'is_default')
        }),
        ('Metadata', {
            'fields': ('created_by', 'created_at', 'updated_at'),
            'classes': ('collapse',)
        }),
    )
    
    readonly_fields = ['created_at', 'updated_at']