package lulu

import (
	"encoding/json"
	"fmt"
	"time"
)

const (
	MinProductionDelay = 60 * time.Minute
	MaxProductionDelay = 48 * time.Hour
)

type printReq[P Printable | Reprintable] struct {
	Contact             EmailAddress    `json:"contact_email"`
	ExternalId          string          `json:"external_id"`
	LineItems           []P             `json:"line_items"`
	ProductionDelayMins uint            `json:"production_delay"`
	ShipAddr            ShippingAddress `json:"shipping_address"`
	ShipOpt             ShippingLevel   `json:"shipping_level"`
}

// PrintableId uniquely identifies a book to be printed: a "printable". A
// printable consists of a cover and an interior file as well as a
// PodPkgId which specifies the manufacturing options.
type PrintableId string

// Printable is a book to be printed.
type Printable struct {
	// Arbitrary string to identify and connect a print job to your
	// systems. Set it to an order number, a purchase order or
	// whatever else works for your particular use case.
	ExternalId string `json:"external_id"`

	// Interior and cover files have to be specified with a URL from
	// which Lulu can download the files. Using encoded basic
	// authentication in the URL is ok. All files processed by Lulu
	// will be validated and normalized before sending them to
	// production. If problems with the file occur, the PrintJob will
	// be rejected or cancelled and an error message will be
	// displayed.
	CoverUrl    string `json:"cover"`
	InteriorUrl string `json:"interior"`

	// Manufacturing options.
	Mfg PkgId `json:"pod_package_id"`

	// The number of copies to print.
	Quantity uint `json:"quantity"`

	// The title of the book. Must not exceed 255 bytes.
	Title string `json:"title"`
}

// Reprintable is a printable whose PrintableId is known from an prior
// print job.
type Reprintable struct {
	// Arbitrary string to identify and connect a print job to your
	// systems. Set it to an order number, a purchase order or
	// whatever else works for your particular use case.
	ExternalId string `json:"external_id"`

	// Uniquely identifies the printable.
	PrintableId PrintableId `json:"printable_id"`

	// The number of copies to print.
	Quantity uint `json:"quantity"`

	// The title of the book. Must not exceed 255 bytes.
	Title string `json:"title"`
}

type getPrintJobsResp struct {
	Count   uint       `json:"count"`
	Next    string     `json:"next"`
	Prev    string     `json:"previous"`
	Results []PrintJob `json:"results"`
}

type PrintJob struct {
	// An email address for questions regarding the print
	// job—normally, you want to use the email address of a
	// developer or shop owner, not the end customer.
	Contact EmailAddress `json:"contact_email"`

	Cost PrintJobCost `json:"costs"`

	Created  time.Time `json:"date_created"`
	Modified time.Time `json:"date_modified"`

	EstimatedShippingDates EstimatedShippingDates `json:"estimated_shipping_dates"`

	// Arbitrary string to identify and connect a print job to your
	// systems. Set it to an order number, a purchase order or
	// whatever else works for your particular use case.
	ExternalId string `json:"external_id"`

	Id uint64 `json:"id"`

	LineItems []LineItem `json:"line_items"`

	OrderId string `json:"order_id"`

	// Delay before a newly created Print-Job is sent to production.
	// Minimum is 60 minutes, maximum is 2880 minutes (=48 hours). As
	// most cancellation requests occur right after an order has been
	// placed, it makes sense to wait for some time before sending an
	// order to production. Once production has started, orders
	// cannot be canceled anymore.
	ProductionDelay time.Duration

	// Target timestamp of when this job will move into production.
	ProductionDue time.Time `json:"production_due_time"`

	AddressValidation ShippingAddressValidation `json:"shipping_address"`

	// The shipping level that this Print-Job is shipped with.
	ShipOpt ShippingLevel `json:"shipping_level"`

	// ISO 3166-1 alpha-2 country code of the tax country determined for this job
	TaxCountry string `json:"tax_country"`

	Status PrintJobStatus `json:"status"`
}

func (pj *PrintJob) UnmarshalJSON(data []byte) error {
	type alias PrintJob // prevent infinite recursion
	if err := json.Unmarshal(data, (*alias)(pj)); err != nil {
		return err
	}
	var extra struct {
		ProductionDelay uint `json:"production_delay"`
	}
	if err := json.Unmarshal(data, &extra); err != nil {
		return fmt.Errorf("error unmarshaling %T.ProductionDelay: %w", *pj, err)
	}
	pj.ProductionDelay = time.Minute * time.Duration(extra.ProductionDelay)
	return nil
}

// LineItem represents a book that should be printed: a "printable" for short.
type LineItem struct {
	// Arbitrary string to identify and connect a print job to your
	// systems. Set it to an order number, a purchase order or
	// whatever else works for your particular use case.
	ExternalId string `json:"external_id"`

	Id uint64 `json:"id"`

	NPages uint `json:"page_count"`

	// Manufacturing options.
	Mfg PkgId `json:"pod_package_id"`

	// Id of the printable. It can be used instead of PrintableNormalization.
	PrintableId PrintableId `json:"printable_id"`

	// Normalization process of the cover and interior source files.
	PrintableNormalization PrintableNormalization `json:"printable_normalization"`

	// Quantity of printed books.
	Quantity uint `json:"quantity"`

	Status LineItemStatus `json:"status"`

	// Title of the line item. Should be on the cover.
	Title string `json:"title"`

	// Tracking id for this line item's shipment.
	TrackingId string `json:"tracking_id"`

	// A list of tracking urls for this line item's shipment.
	TrackingUrls []string `json:"tracking_urls"`

	// Name of the carrier handling the shipment.
	Carrier string `json:"carrier_name"`
}

type EstimatedShippingDates struct {
	ArrivalMax  Date `json:"arrival_max"`
	ArrivalMin  Date `json:"arrival_min"`
	DispatchMax Date `json:"dispatch_max"`
	DispatchMin Date `json:"dispatch_min"`
}

// PrintableNormalization represents the normalization processes of the
// interior and cover source files.
type PrintableNormalization struct {
	Cover    NormalizationJob `json:"cover"`
	Interior NormalizationJob `json:"interior"`
}

// NormalizationJob represents the normalization process of an interior
// or cover source file.
type NormalizationJob struct {
	JobId          uint           `json:"job_id"`
	NormalizedFile NormalizedFile `json:"normalized_file"`
	SrcMd5Sum      string         `json:"source_md5_sum"` // md5 hash of the source file.
	SrcUrl         string         `json:"source_url"`     // URL of the source file.
}

// NormalizedFile represents a file on the server that was created by
// normalizing a cover or interior source file.
type NormalizedFile struct {
	Id   uint64 `json:"file_id"`
	Name string `json:"filename"`
}

type LineItemStatus struct {
	Messages LineItemStatusMessages `json:"messages"`
	Status   ItemStatus             `json:"name"`
}

type LineItemStatusMessages struct {
	Delay                  time.Duration          // Expected delay due to the error, if present.
	Error                  string                 `json:"error"`
	Info                   string                 `json:"info"`
	PrintableNormalization PrintableNormalization `json:"printable_normalization"`
	Timestamp              time.Time              `json:"timestamp"` // Timestamp of the last status change.
	TrackingUrls           []string
	TrackingId             string `json:"tracking_id"`  // Tracking ID for this line item's shipment.
	Carrier                string `json:"carrier_name"` // Name of the carrier handling the shipment.
}

func (msgs *LineItemStatusMessages) UnmarshalJSON(data []byte) error {
	type alias LineItemStatusMessages // prevent infinite recursion
	if err := json.Unmarshal(data, (*alias)(msgs)); err != nil {
		return err
	}

	var extra struct {
		Delay        string          `json:"delay"`
		TrackingUrls json.RawMessage `json:"tracking_urls"`
	}
	if err := json.Unmarshal(data, &extra); err != nil {
		return err
	}

	var err error
	if len(extra.Delay) > 0 {
		msgs.Delay, err = time.ParseDuration(fmt.Sprintf("%sh", extra.Delay))
		if err != nil {
			return fmt.Errorf("error unmarshaling %T.Delay: %w", *msgs, err)
		}
	}

	if len(extra.TrackingUrls) > 0 {
		msgs.TrackingUrls, err = unmarshalSliceOrVal[string](extra.TrackingUrls)
		if err != nil {
			return fmt.Errorf("error unmarshaling %T.TrackingUrls: %w", *msgs, err)
		}
	}

	return nil
}

type PrintJobStatus struct {
	Changed time.Time   `json:"changed"` // time of the last status change
	Msg     string      `json:"message"`
	Status  OrderStatus `json:"name"`
}