from django.contrib import admin
from .models import (
    UserProfile, Project, Worker, Team, WorkLog,
    PayrollRecord, Loan, PayrollAdjustment,
    ExpenseReceipt, ExpenseLineItem,
    WorkerCertificate, WorkerWarning,
)

@admin.register(UserProfile)
class UserProfileAdmin(admin.ModelAdmin):
    list_display = ('user',)
    search_fields = ('user__username', 'user__first_name', 'user__last_name')

@admin.register(Project)
class ProjectAdmin(admin.ModelAdmin):
    list_display = ('name', 'active')
    list_filter = ('active',)
    search_fields = ('name', 'description')
    filter_horizontal = ('supervisors',)

# === INLINE ADMINS FOR WORKER ===
# Let admins manage a worker's certifications and warnings directly
# from the Worker change page, without navigating to a separate screen.
class WorkerCertificateInline(admin.TabularInline):
    model = WorkerCertificate
    extra = 0  # no blank rows by default — admin clicks "Add another" to create
    readonly_fields = ('created_at',)
    fields = ('cert_type', 'document', 'issued_date', 'valid_until', 'notes', 'created_at')


class WorkerWarningInline(admin.TabularInline):
    model = WorkerWarning
    extra = 0
    readonly_fields = ('created_at',)
    fields = ('date', 'severity', 'reason', 'description', 'issued_by', 'document', 'created_at')


@admin.register(Worker)
class WorkerAdmin(admin.ModelAdmin):
    list_display = ('name', 'id_number', 'monthly_salary', 'active')
    list_filter = ('active', 'has_drivers_license')
    search_fields = ('name', 'id_number', 'phone_number')

    # Inline sections for certs + warnings appear below the main Worker form
    inlines = [WorkerCertificateInline, WorkerWarningInline]

    # === FIELDSETS ===
    # Organise the worker edit form into clear sections.
    # Banking & Tax fields (UIF, Bank, Acc No.) live inside Personal Info
    # per product requirement — help_text strings render as hints under
    # each field in admin (and as tooltips on the friendly edit page).
    fieldsets = (
        ('Personal Info', {
            'fields': ('name', 'id_number', 'phone_number', 'monthly_salary',
                       'tax_number', 'uif_number',
                       'bank_name', 'bank_account_number',
                       'employment_date', 'active', 'notes'),
        }),
        ('Sizing', {
            'fields': ('shoe_size', 'overall_top_size', 'pants_size', 'tshirt_size'),
        }),
        ('Documents & License', {
            'fields': ('photo', 'id_document',
                       'has_drivers_license', 'drivers_license', 'drivers_license_code'),
        }),
    )


# === STANDALONE ADMINS FOR CERTS + WARNINGS ===
# Separate pages for bulk operations across workers — "show me all
# certs expiring this month" or "show me all final warnings".
@admin.register(WorkerCertificate)
class WorkerCertificateAdmin(admin.ModelAdmin):
    list_display = ('worker', 'cert_type', 'issued_date', 'valid_until', 'is_expired')
    list_filter = ('cert_type',)
    search_fields = ('worker__name', 'worker__id_number')
    date_hierarchy = 'valid_until'


@admin.register(WorkerWarning)
class WorkerWarningAdmin(admin.ModelAdmin):
    list_display = ('worker', 'date', 'severity', 'reason', 'issued_by')
    list_filter = ('severity',)
    search_fields = ('worker__name', 'reason', 'description')
    date_hierarchy = 'date'

@admin.register(Team)
class TeamAdmin(admin.ModelAdmin):
    list_display = ('name', 'supervisor', 'pay_frequency', 'pay_start_date', 'active')
    list_editable = ('pay_frequency', 'pay_start_date')
    list_filter = ('active', 'supervisor', 'pay_frequency')
    search_fields = ('name',)
    filter_horizontal = ('workers',)

@admin.register(WorkLog)
class WorkLogAdmin(admin.ModelAdmin):
    list_display = ('date', 'project', 'supervisor', 'overtime_amount')
    list_filter = ('date', 'project', 'supervisor')
    search_fields = ('project__name', 'notes')
    filter_horizontal = ('workers', 'priced_workers')

@admin.register(PayrollRecord)
class PayrollRecordAdmin(admin.ModelAdmin):
    list_display = ('worker', 'date', 'amount_paid')
    list_filter = ('date', 'worker')
    search_fields = ('worker__name',)
    filter_horizontal = ('work_logs',)

@admin.register(Loan)
class LoanAdmin(admin.ModelAdmin):
    list_display = ('worker', 'principal_amount', 'remaining_balance', 'date', 'active')
    list_filter = ('active', 'date', 'worker')
    search_fields = ('worker__name', 'reason')

@admin.register(PayrollAdjustment)
class PayrollAdjustmentAdmin(admin.ModelAdmin):
    list_display = ('worker', 'type_display', 'amount', 'date')
    list_filter = ('type', 'date', 'worker')
    search_fields = ('worker__name', 'description')

    # === Type column uses the short user-facing label ===
    @admin.display(description='Type', ordering='type')
    def type_display(self, obj):
        """Show the short user-facing label (e.g. "Loan", "Advance")
        instead of the raw DB value ("New Loan", "Advance Payment").
        Sorting and filtering still work off the underlying `type`
        field — this only changes what's printed in the column."""
        return obj.get_type_display()

class ExpenseLineItemInline(admin.TabularInline):
    model = ExpenseLineItem
    extra = 1

@admin.register(ExpenseReceipt)
class ExpenseReceiptAdmin(admin.ModelAdmin):
    list_display = ('vendor_name', 'date', 'total_amount', 'user')
    list_filter = ('date', 'payment_method', 'vat_type')
    search_fields = ('vendor_name', 'description')
    inlines = [ExpenseLineItemInline]

@admin.register(ExpenseLineItem)
class ExpenseLineItemAdmin(admin.ModelAdmin):
    list_display = ('product_name', 'amount', 'receipt')
    search_fields = ('product_name', 'receipt__vendor_name')