package models

import (
	"time"
)

// Invoice represents a complete invoice with auto-fill capabilities
type Invoice struct {
	ID uint `json:"id" gorm:"primaryKey"`

	// Invoice identification
	InvoiceNumber  string `json:"invoice_number" gorm:"size:50;uniqueIndex;not null"`
	InvoiceType    string `json:"invoice_type" gorm:"size:20;default:'faktura'"` // "faktura", "zalohova_faktura", "proforma_faktura", "dobropis"
	VariableSymbol string `json:"variable_symbol" gorm:"size:20"`
	ConstantSymbol string `json:"constant_symbol" gorm:"size:20"`
	SpecificSymbol string `json:"specific_symbol" gorm:"size:20"`

	// Invoice dates
	IssueDate         time.Time `json:"issue_date" gorm:"not null"`
	DueDate           time.Time `json:"due_date" gorm:"not null"`
	TaxableSupplyDate time.Time `json:"taxable_supply_date"`

	// Supplier information (auto-filled from club settings)
	SupplierName    string `json:"supplier_name" gorm:"size:255;not null"`
	SupplierICO     string `json:"supplier_ico" gorm:"size:20"`
	SupplierDIC     string `json:"supplier_dic" gorm:"size:20"`
	SupplierAddress string `json:"supplier_address" gorm:"type:text"`
	SupplierCity    string `json:"supplier_city" gorm:"size:100"`
	SupplierZIP     string `json:"supplier_zip" gorm:"size:10"`
	SupplierCountry string `json:"supplier_country" gorm:"size:100;default:'Česká republika'"`

	// Supplier bank information (auto-filled)
	BankName    string `json:"bank_name" gorm:"size:255"`
	BankAccount string `json:"bank_account" gorm:"size:50"`
	BankIBAN    string `json:"bank_iban" gorm:"size:50"`
	BankSWIFT   string `json:"bank_swift" gorm:"size:20"`

	// Customer information (manual or auto-fill from database)
	CustomerID      *uint  `json:"customer_id" gorm:"index"`
	CustomerName    string `json:"customer_name" gorm:"size:255;not null"`
	CustomerICO     string `json:"customer_ico" gorm:"size:20"`
	CustomerDIC     string `json:"customer_dic" gorm:"size:20"`
	CustomerAddress string `json:"customer_address" gorm:"type:text"`
	CustomerCity    string `json:"customer_city" gorm:"size:100"`
	CustomerZIP     string `json:"customer_zip" gorm:"size:10"`
	CustomerCountry string `json:"customer_country" gorm:"size:100;default:'Česká republika'"`
	CustomerEmail   string `json:"customer_email" gorm:"size:255"`
	CustomerPhone   string `json:"customer_phone" gorm:"size:50"`

	// Financial summary
	TotalAmount           float64 `json:"total_amount" gorm:"type:decimal(15,2);not null"`
	TotalVAT              float64 `json:"total_vat" gorm:"type:decimal(15,2);not null"`
	TotalAmountVAT        float64 `json:"total_amount_vat" gorm:"type:decimal(15,2);not null"`
	TotalAmountWithoutVAT float64 `json:"total_amount_without_vat" gorm:"type:decimal(15,2);not null"`
	Currency              string  `json:"currency" gorm:"size:3;default:'CZK'"`

	// Invoice status and workflow
	Status        string     `json:"status" gorm:"size:20;default:'draft'"`          // "draft", "sent", "paid", "overdue", "cancelled"
	PaymentStatus string     `json:"payment_status" gorm:"size:20;default:'unpaid'"` // "unpaid", "partially_paid", "paid", "overdue"
	PaymentDate   *time.Time `json:"payment_date"`
	PaidAmount    float64    `json:"paid_amount" gorm:"type:decimal(15,2);default:0"`

	// Additional information
	Note         string `json:"note" gorm:"type:text"`
	PaymentNote  string `json:"payment_note" gorm:"type:text"`
	InternalNote string `json:"internal_note" gorm:"type:text"`

	// PDF and sending
	PDFPath        string     `json:"pdf_path" gorm:"size:500"`
	PDFGeneratedAt *time.Time `json:"pdf_generated_at"`
	SentAt         *time.Time `json:"sent_at"`
	SentTo         string     `json:"sent_to" gorm:"type:text"` // JSON array of emails

	// Metadata
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
	CreatedBy uint      `json:"created_by"`
	UpdatedBy uint      `json:"updated_by"`

	// Relations
	Items    []InvoiceItem    `json:"items,omitempty" gorm:"foreignKey:InvoiceID;constraint:OnDelete:CASCADE"`
	Payments []InvoicePayment `json:"payments,omitempty" gorm:"foreignKey:InvoiceID;constraint:OnDelete:CASCADE"`
	Customer *InvoiceCustomer `json:"customer,omitempty" gorm:"foreignKey:CustomerID"`
}

// InvoiceItem represents individual line items in an invoice
type InvoiceItem struct {
	ID        uint `json:"id" gorm:"primaryKey"`
	InvoiceID uint `json:"invoice_id" gorm:"not null;index"`

	// Item details
	Description string  `json:"description" gorm:"type:text;not null"`
	Quantity    float64 `json:"quantity" gorm:"type:decimal(12,3);not null"`
	Unit        string  `json:"unit" gorm:"size:20;default:'ks'"` // "ks", "hod", "m", "kg", etc.
	UnitPrice   float64 `json:"unit_price" gorm:"type:decimal(15,2);not null"`
	TotalPrice  float64 `json:"total_price" gorm:"type:decimal(15,2);not null"`

	// VAT information
	VATRate      float64 `json:"vat_rate" gorm:"type:decimal(5,2);not null"` // 0, 10, 21
	VATAmount    float64 `json:"vat_amount" gorm:"type:decimal(15,2);not null"`
	TotalWithVAT float64 `json:"total_with_vat" gorm:"type:decimal(15,2);not null"`

	// Additional fields
	Code string `json:"code" gorm:"size:100"` // Product code or service code
	Note string `json:"note" gorm:"type:text"`

	// Metadata
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`

	// Relations
	Invoice Invoice `json:"invoice,omitempty" gorm:"foreignKey:InvoiceID"`
}

// InvoicePayment represents payments received for invoices
type InvoicePayment struct {
	ID        uint `json:"id" gorm:"primaryKey"`
	InvoiceID uint `json:"invoice_id" gorm:"not null;index"`

	// Payment details
	Amount        float64   `json:"amount" gorm:"type:decimal(15,2);not null"`
	Currency      string    `json:"currency" gorm:"size:3;default:'CZK'"`
	PaymentDate   time.Time `json:"payment_date" gorm:"not null"`
	PaymentMethod string    `json:"payment_method" gorm:"size:50"` // "bank_transfer", "cash", "card", "other"

	// Bank transfer details
	VariableSymbol string `json:"variable_symbol" gorm:"size:20"`
	ConstantSymbol string `json:"constant_symbol" gorm:"size:20"`
	SpecificSymbol string `json:"specific_symbol" gorm:"size:20"`
	BankAccount    string `json:"bank_account" gorm:"size:50"`

	// Additional information
	Note            string `json:"note" gorm:"type:text"`
	ReferenceNumber string `json:"reference_number" gorm:"size:255"`

	// Metadata
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
	CreatedBy uint      `json:"created_by"`

	// Relations
	Invoice Invoice `json:"invoice,omitempty" gorm:"foreignKey:InvoiceID"`
}

// InvoiceCustomer represents customer database for auto-fill
type InvoiceCustomer struct {
	ID uint `json:"id" gorm:"primaryKey"`

	// Basic information
	Name string `json:"name" gorm:"size:255;not null"`
	ICO  string `json:"ico" gorm:"size:20;uniqueIndex"`
	DIC  string `json:"dic" gorm:"size:20"`

	// Address
	Address string `json:"address" gorm:"type:text"`
	City    string `json:"city" gorm:"size:100"`
	ZIP     string `json:"zip" gorm:"column:zip;size:10"`
	Country string `json:"country" gorm:"size:100;default:'Česká republika'"`

	// Contact information
	Email   string `json:"email" gorm:"size:255"`
	Phone   string `json:"phone" gorm:"size:50"`
	Website string `json:"website" gorm:"size:255"`

	// Business information
	BusinessType string `json:"business_type" gorm:"size:100"` // "individual", "company", "non_profit"
	VATPayer     bool   `json:"vat_payer" gorm:"default:true"`

	// Notes and metadata
	Notes  string `json:"notes" gorm:"type:text"`
	Active bool   `json:"active" gorm:"default:true"`

	// Metadata
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
	CreatedBy uint      `json:"created_by"`
	UpdatedBy uint      `json:"updated_by"`

	// Relations
	Invoices []Invoice `json:"invoices,omitempty" gorm:"foreignKey:CustomerID"`
}

// InvoiceTemplate represents invoice templates for different types
type InvoiceTemplate struct {
	ID uint `json:"id" gorm:"primaryKey"`

	// Template identification
	Name        string `json:"name" gorm:"size:255;not null"`
	Type        string `json:"type" gorm:"size:50;not null"` // "standard", "proforma", "credit_note"
	Description string `json:"description" gorm:"type:text"`

	// Template content (HTML with placeholders)
	HeaderHTML string `json:"header_html" gorm:"type:text"`
	BodyHTML   string `json:"body_html" gorm:"type:text"`
	FooterHTML string `json:"footer_html" gorm:"type:text"`

	// CSS styling
	CSS string `json:"css" gorm:"type:text"`

	// Default settings
	DefaultVATRate     float64 `json:"default_vat_rate" gorm:"type:decimal(5,2);default:21"`
	DefaultPaymentTerm int     `json:"default_payment_term" gorm:"default:14"` // days

	// Status
	Active  bool `json:"active" gorm:"default:true"`
	Default bool `json:"default" gorm:"default:false"`

	// Metadata
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
	CreatedBy uint      `json:"created_by"`
	UpdatedBy uint      `json:"updated_by"`
}

// InvoiceSettings represents global invoice settings
type InvoiceSettings struct {
	ID uint `json:"id" gorm:"primaryKey"`

	// Company information (auto-fill source)
	CompanyName    string `json:"company_name" gorm:"size:255;not null"`
	CompanyICO     string `json:"company_ico" gorm:"size:20;not null"`
	CompanyDIC     string `json:"company_dic" gorm:"size:20"`
	CompanyAddress string `json:"company_address" gorm:"type:text"`
	CompanyCity    string `json:"company_city" gorm:"size:100"`
	CompanyZIP     string `json:"company_zip" gorm:"size:10"`
	CompanyCountry string `json:"company_country" gorm:"size:100;default:'Česká republika'"`

	// Bank information
	BankName    string `json:"bank_name" gorm:"size:255"`
	BankAccount string `json:"bank_account" gorm:"size:50"`
	BankIBAN    string `json:"bank_iban" gorm:"size:50"`
	BankSWIFT   string `json:"bank_swift" gorm:"size:20"`

	// Invoice numbering
	InvoiceNumberFormat string `json:"invoice_number_format" gorm:"size:100;default:'F{year}{seq:6}'"` // Format with placeholders
	NextInvoiceNumber   int    `json:"next_invoice_number" gorm:"default:1"`
	CurrentYear         int    `json:"current_year"`

	// Default settings
	DefaultPaymentTerm int     `json:"default_payment_term" gorm:"default:14"` // days
	DefaultVATRate     float64 `json:"default_vat_rate" gorm:"type:decimal(5,2);default:21"`
	DefaultCurrency    string  `json:"default_currency" gorm:"size:3;default:'CZK'"`

	// Email settings
	EmailFrom    string `json:"email_from" gorm:"size:255"`
	EmailSubject string `json:"email_subject" gorm:"size:255;default:'Faktura č. {invoice_number}'"`
	EmailBody    string `json:"email_body" gorm:"type:text"`

	// PDF settings
	PDFLogoPath string `json:"pdf_logo_path" gorm:"size:500"`
	PDFFooter   string `json:"pdf_footer" gorm:"type:text"`

	// Legal information
	RegistrationNumber    string `json:"registration_number" gorm:"size:50"`
	TaxRegistrationNumber string `json:"tax_registration_number" gorm:"size:50"`

	// Metadata
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
	UpdatedBy uint      `json:"updated_by"`
}

// InvoiceSequence represents invoice number sequences
type InvoiceSequence struct {
	ID uint `json:"id" gorm:"primaryKey"`

	// Sequence identification
	Type string `json:"type" gorm:"size:50;not null"` // "faktura", "zalohova_faktura", "proforma_faktura", "dobropis"
	Year int    `json:"year" gorm:"not null"`

	// Sequence numbers
	CurrentNumber int    `json:"current_number" gorm:"default:1"`
	Prefix        string `json:"prefix" gorm:"size:20"`
	Suffix        string `json:"suffix" gorm:"size:20"`
	Padding       int    `json:"padding" gorm:"default:6"`

	// Metadata
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
}