package booking

import (
	"context"
	"errors"
	"fmt"
	"log/slog"
	"path"
	"time"

	"gorm.io/gorm"

	"github.com/rjNemo/rentease/internal/config"
)

type Store interface {
	All() []*Line
	Search(value string) []*Line
	List(from, to time.Time) ([]*Line, error)
	CardTotal(from, to time.Time) (float64, error)
	Get(id int) (*Booking, error)
	Create(b *Booking) error
	Update(b *Booking) error
	Cancel(id int) error
	UpsertInvoiceDocument(doc *InvoiceDocument) error

	// Item methods
	CreateItem(i *Item) error
	PayItem(id int) (*Item, error)
	GetItem(id int) (*Item, error)
	UpdateItem(id int, item string, paymentMethod string, paymentStatus string, qty int, price float64) (*Item, error)
}

type PdfClient interface {
	BuildInvoice(invoice Invoice) (*GeneratedFile, error)
	BuildReport(report ReportData, period string, month, year int) (string, error)
}

type InvoiceStorage interface {
	StoreInvoice(ctx context.Context, objectKey string, file GeneratedFile, shareURLTTL time.Duration) (*StoredInvoiceFile, error)
}

type CalendarClient interface {
	Create(calendarID, name, description string, from, to time.Time) error
}

type parserClient interface {
	Parse(rawContent string) (*Booking, error)
}

type Service struct {
	store              Store
	parser             parserClient
	pdf                PdfClient
	storage            InvoiceStorage
	logger             *slog.Logger
	invoiceShareURLTTL time.Duration
}

func NewService(
	logger *slog.Logger,
	store Store,
	parser parserClient,
	pdf PdfClient,
	storage InvoiceStorage,
	invoiceShareURLTTL time.Duration,
) (*Service, error) {
	svcLogger := logger
	if svcLogger == nil {
		svcLogger = slog.Default()
	}
	if invoiceShareURLTTL <= 0 {
		invoiceShareURLTTL = 7 * 24 * time.Hour
	}

	return &Service{
		logger:             svcLogger.With(slog.String("component", "booking_service")),
		store:              store,
		parser:             parser,
		pdf:                pdf,
		storage:            storage,
		invoiceShareURLTTL: invoiceShareURLTTL,
	}, nil
}

func (bs Service) All() []*Line {
	bs.logger.Info("fetching all bookings")
	return bs.store.All()
}

func (bs Service) Search(value string) []*Line {
	return bs.store.Search(value)
}

func (bs Service) Create(From time.Time, To time.Time, Name, PhoneNumber, Email, Platform string,
	CustomerNumber int, PlatformFees float64, externalID *string,
) *Booking {
	// TODO: return the error
	b := NewBooking(From, To, Name, PhoneNumber, Email, Platform, CustomerNumber, PlatformFees, externalID)
	err := bs.store.Create(b)
	if err != nil {
		bs.logger.Info("failed to create booking", slog.Any("err", err))
	}
	return b
}

func (bs Service) One(id int) (*Booking, error) {
	b, err := bs.store.Get(id)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, ErrBookingNotFound
		}
		return nil, err
	}
	return b, nil
}

// Update updates an existing booking with new data
func (bs Service) Update(id int, From time.Time, To time.Time, Name string, PhoneNumber string, Email string, Platform string,
	CustomerNumber int, PlatformFees float64, externalID *string,
) *Booking {
	b := NewBooking(From, To, Name, PhoneNumber, Email, Platform, CustomerNumber, PlatformFees, externalID).WithID(id)
	if err := bs.store.Update(b); err != nil {
		bs.logger.Info("failed to create booking", slog.Any("err", err))
	}
	return b
}

func (bs Service) Cancel(id int) {
	err := bs.store.Cancel(id)
	if err != nil {
		bs.logger.Info("failed to create booking", slog.Any("err", err))
	}
}

func (bs Service) CreateInvoice(ctx context.Context, b *Booking, hc *config.Host) (*InvoiceDocument, error) {
	if bs.storage == nil {
		return nil, ErrInvoiceStorageNotConfigured
	}

	file, err := bs.pdf.BuildInvoice(b.ToInvoice(hc))
	if err != nil {
		return nil, fmt.Errorf("build invoice pdf: %w", err)
	}

	objectKey := path.Join("invoices", fmt.Sprintf("%d", b.ID), file.Name)
	stored, err := bs.storage.StoreInvoice(ctx, objectKey, *file, bs.invoiceShareURLTTL)
	if err != nil {
		return nil, fmt.Errorf("store invoice pdf: %w", err)
	}

	doc := &InvoiceDocument{
		BookingID:         b.ID,
		ObjectKey:         stored.ObjectKey,
		FileName:          file.Name,
		ContentType:       file.ContentType,
		ShareURL:          stored.ShareURL,
		ShareURLExpiresAt: stored.ShareURLExpiresAt,
	}
	if err := bs.store.UpsertInvoiceDocument(doc); err != nil {
		return nil, fmt.Errorf("persist invoice document: %w", err)
	}

	return doc, nil
}