package vchasno

import (
	"context"
	"time"

	"gitea.jeezft.xyz/jeezft/go-vchasno-kassa/api"
)

const (
	PayTypeCash = api.PayTypeCash
	PayTypeCard = api.PayTypeCard
)

const (
	TaskOpenShift = api.TaskOpenShift
	TaskSell      = api.TaskSell
	TaskZReport   = api.TaskZReport
)

type Client struct {
	api      *api.Client
	cashier  string
	source   string
	defaults *DefaultParams
}

type Config struct {
	Token    string
	Cashier  string
	Source   string
	Defaults *DefaultParams
}

type DefaultParams struct {
	ProductName    string
	Comment        string
	Taxgrp         string
	PayType        int
	DefaultTimeout time.Duration
}

func NewClient(config Config) *Client {
	if config.Cashier == "" {
		config.Cashier = "cashier"
	}
	if config.Source == "" {
		config.Source = "api"
	}

	defaults := config.Defaults
	if defaults == nil {
		defaults = &DefaultParams{
			Taxgrp:         "1",
			PayType:        PayTypeCard,
			DefaultTimeout: 30 * time.Second,
		}
	}

	if defaults.Taxgrp == "" {
		defaults.Taxgrp = "1"
	}
	if defaults.DefaultTimeout == 0 {
		defaults.DefaultTimeout = 30 * time.Second
	}

	return &Client{
		api:      api.NewClient(config.Token),
		cashier:  config.Cashier,
		source:   config.Source,
		defaults: defaults,
	}
}

func (c *Client) SetDefaults(defaults DefaultParams) {
	c.defaults = &defaults
}

func (c *Client) GetDefaults() DefaultParams {
	return *c.defaults
}

func (c *Client) OpenShift(ctx context.Context) (*api.SellResponse, error) {
	return c.api.OpenShift(ctx, c.cashier)
}

func (c *Client) CloseShift(ctx context.Context) (*api.ZReportResponse, error) {
	return c.api.CloseShift(ctx, c.cashier)
}

type SellParams struct {
	Name       string
	Cnt        int
	Price      float64
	Disc       float64
	Taxgrp     string
	Comment    string
	PayType    int
	CardParams *CardParams
	Userinfo   *api.Userinfo
}

type CardParams struct {
	Cardmask string
	BankID   string
	RrnCode  string
	AuthCode string
}

func (c *Client) NewSellParams() *SellParamsBuilder {
	return &SellParamsBuilder{
		client: c,
		params: SellParams{
			Name:    c.defaults.ProductName,
			Cnt:     1,
			Taxgrp:  c.defaults.Taxgrp,
			Comment: c.defaults.Comment,
			PayType: c.defaults.PayType,
		},
	}
}

type SellParamsBuilder struct {
	client *Client
	params SellParams
}

func (b *SellParamsBuilder) Name(name string) *SellParamsBuilder {
	b.params.Name = name
	return b
}

func (b *SellParamsBuilder) Cnt(cnt int) *SellParamsBuilder {
	b.params.Cnt = cnt
	return b
}

func (b *SellParamsBuilder) Price(price float64) *SellParamsBuilder {
	b.params.Price = price
	return b
}

func (b *SellParamsBuilder) Disc(disc float64) *SellParamsBuilder {
	b.params.Disc = disc
	return b
}

func (b *SellParamsBuilder) Taxgrp(taxgrp string) *SellParamsBuilder {
	b.params.Taxgrp = taxgrp
	return b
}

func (b *SellParamsBuilder) Comment(comment string) *SellParamsBuilder {
	b.params.Comment = comment
	return b
}

func (b *SellParamsBuilder) PayCash() *SellParamsBuilder {
	b.params.PayType = PayTypeCash
	b.params.CardParams = nil
	return b
}

func (b *SellParamsBuilder) PayCard(cardmask, bankID, rrnCode, authCode string) *SellParamsBuilder {
	b.params.PayType = PayTypeCard
	b.params.CardParams = &CardParams{
		Cardmask: cardmask,
		BankID:   bankID,
		RrnCode:  rrnCode,
		AuthCode: authCode,
	}
	return b
}

func (b *SellParamsBuilder) Userinfo(email, phone string) *SellParamsBuilder {
	b.params.Userinfo = &api.Userinfo{
		Email: email,
		Phone: phone,
	}
	return b
}

func (b *SellParamsBuilder) Build() SellParams {
	return b.params
}

func (b *SellParamsBuilder) Execute(ctx context.Context) (*api.SellResponse, error) {
	return b.client.Sell(ctx, b.params)
}

func (b *SellParamsBuilder) ExecuteWithTimeout(timeout time.Duration) (*api.SellResponse, error) {
	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()
	return b.client.Sell(ctx, b.params)
}

func (b *SellParamsBuilder) ExecuteDefault() (*api.SellResponse, error) {
	return b.ExecuteWithTimeout(b.client.defaults.DefaultTimeout)
}

func (c *Client) Sell(ctx context.Context, params SellParams) (*api.SellResponse, error) {
	if params.Taxgrp == "" {
		params.Taxgrp = c.defaults.Taxgrp
	}
	if params.Name == "" {
		params.Name = c.defaults.ProductName
	}
	if params.Comment == "" {
		params.Comment = c.defaults.Comment
	}
	if params.Cnt == 0 {
		params.Cnt = 1
	}

	row := api.NewReceiptRow(params.Name, params.Cnt, params.Price, params.Taxgrp)
	if params.Disc > 0 {
		row.Disc = params.Disc
	}
	if params.Comment != "" {
		row.Comment = params.Comment
	}

	var pay api.ReceiptPay
	sum := (params.Price - params.Disc) * float64(params.Cnt)

	if params.PayType == PayTypeCard && params.CardParams != nil {
		pay = api.NewReceiptPayCard(
			sum,
			params.CardParams.Cardmask,
			params.CardParams.BankID,
			params.CardParams.RrnCode,
			params.CardParams.AuthCode,
		)
	} else {
		pay = api.NewReceiptPayCash(sum, params.Comment)
	}

	return c.api.Sell(ctx, api.SellParams{
		Cashier:  c.cashier,
		Source:   c.source,
		Rows:     []api.ReceiptRow{row},
		Pays:     []api.ReceiptPay{pay},
		Userinfo: params.Userinfo,
	})
}

func (c *Client) SellWithTimeout(params SellParams, timeout time.Duration) (*api.SellResponse, error) {
	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()
	return c.Sell(ctx, params)
}

func (c *Client) QuickSell(ctx context.Context, price float64) (*api.SellResponse, error) {
	return c.Sell(ctx, SellParams{
		Price: price,
	})
}

func (c *Client) QuickSellNamed(ctx context.Context, name string, price float64) (*api.SellResponse, error) {
	return c.Sell(ctx, SellParams{
		Name:  name,
		Price: price,
	})
}