package models

import (
	"time"
)

// Budget represents a budget category with limits and tracking
type Budget struct {
	ID          uint   `json:"id" gorm:"primaryKey"`
	Name        string `json:"name" gorm:"not null;size:255"`
	Description string `json:"description" gorm:"type:text"`
	Category    string `json:"category" gorm:"size:100;index"` // např. "Týmové provoz", "Stadion", "Marketing", "Cestování"

	// Budget limits and tracking
	YearlyLimit  float64 `json:"yearly_limit" gorm:"type:decimal(12,2)"`
	MonthlyLimit float64 `json:"monthly_limit" gorm:"type:decimal(12,2)"`
	CurrentSpend float64 `json:"current_spend" gorm:"type:decimal(12,2);default:0"`

	// Budget period
	FiscalYear int       `json:"fiscal_year" gorm:"index"`
	StartDate  time.Time `json:"start_date"`
	EndDate    time.Time `json:"end_date"`

	// Status and management
	Active         bool    `json:"active" gorm:"default:true"`
	AlertThreshold float64 `json:"alert_threshold" gorm:"type:decimal(5,2);default:80"` // % pro varování

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

	// Relations
	Expenses []Expense `json:"expenses,omitempty" gorm:"foreignKey:BudgetID"`
}

// Sponsorship represents sponsorship contracts and tracking
type Sponsorship struct {
	ID            uint   `json:"id" gorm:"primaryKey"`
	SponsorName   string `json:"sponsor_name" gorm:"not null;size:255"`
	SponsorLogo   string `json:"sponsor_logo" gorm:"size:500"`
	ContactPerson string `json:"contact_person" gorm:"size:255"`
	ContactEmail  string `json:"contact_email" gorm:"size:255"`
	ContactPhone  string `json:"contact_phone" gorm:"size:50"`

	// Contract details
	ContractNumber string `json:"contract_number" gorm:"size:100;uniqueIndex"`
	ContractType   string `json:"contract_type" gorm:"size:100"` // "Hlavní", "Technický", "Mediální", "Akce"

	// Financial terms
	TotalValue      float64 `json:"total_value" gorm:"type:decimal(12,2)"`
	PaymentSchedule string  `json:"payment_schedule" gorm:"size:100"` // "Měsíčně", "Čtvrtletně", "Ročně", "Jednorázově"
	Currency        string  `json:"currency" gorm:"size:3;default:'CZK'"`

	// Contract period
	StartDate     time.Time `json:"start_date"`
	EndDate       time.Time `json:"end_date"`
	AutoRenewal   bool      `json:"auto_renewal" gorm:"default:false"`
	RenewalNotice int       `json:"renewal_notice" gorm:"default:90"` // dní předem

	// Benefits and obligations
	Benefits    string `json:"benefits" gorm:"type:text"` // JSON s detaily benefitů
	Obligations string `json:"obligations" gorm:"type:text"`

	// Status tracking
	Status          string    `json:"status" gorm:"size:50;default:'active'"` // "active", "expired", "terminated", "pending"
	LastPaymentDate time.Time `json:"last_payment_date"`
	NextPaymentDate time.Time `json:"next_payment_date"`

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

	// Relations
	Payments  []SponsorshipPayment  `json:"payments,omitempty" gorm:"foreignKey:SponsorshipID"`
	Documents []SponsorshipDocument `json:"documents,omitempty" gorm:"foreignKey:SponsorshipID"`
}

// SponsorshipPayment tracks individual payments from sponsors
type SponsorshipPayment struct {
	ID            uint `json:"id" gorm:"primaryKey"`
	SponsorshipID uint `json:"sponsorship_id" gorm:"not null;index"`

	// Payment details
	Amount        float64   `json:"amount" gorm:"type:decimal(12,2)"`
	Currency      string    `json:"currency" gorm:"size:3;default:'CZK'"`
	PaymentDate   time.Time `json:"payment_date"`
	PaymentMethod string    `json:"payment_method" gorm:"size:100"` // "Bankovní převod", "Hotovost", "Karta"

	// Reference and status
	ReferenceNumber string `json:"reference_number" gorm:"size:255"`
	Status          string `json:"status" gorm:"size:50;default:'received'"` // "expected", "received", "overdue", "cancelled"
	Notes           string `json:"notes" gorm:"type:text"`

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

	// Relations
	Sponsorship Sponsorship `json:"sponsorship,omitempty" gorm:"foreignKey:SponsorshipID"`
}

// SponsorshipDocument stores contract documents and related files
type SponsorshipDocument struct {
	ID            uint `json:"id" gorm:"primaryKey"`
	SponsorshipID uint `json:"sponsorship_id" gorm:"not null;index"`

	// Document details
	Name     string `json:"name" gorm:"not null;size:255"`
	Type     string `json:"type" gorm:"size:100"` // "Smlouva", "Faktura", "Dodatek", "Jiný"
	FileName string `json:"file_name" gorm:"size:500"`
	FilePath string `json:"file_path" gorm:"size:500"`
	FileSize int64  `json:"file_size"`
	MimeType string `json:"mime_type" gorm:"size:100"`

	// Document metadata
	Description string `json:"description" gorm:"type:text"`
	Version     string `json:"version" gorm:"size:20;default:'1.0'"`

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

	// Relations
	Sponsorship Sponsorship `json:"sponsorship,omitempty" gorm:"foreignKey:SponsorshipID"`
}

// Expense represents individual expenses with receipt tracking
type Expense struct {
	ID uint `json:"id" gorm:"primaryKey"`

	// Basic expense info
	Title       string `json:"title" gorm:"not null;size:255"`
	Description string `json:"description" gorm:"type:text"`
	Category    string `json:"category" gorm:"size:100;index"` // "Cestování", "Materiál", "Služby", "Strava", "Ubytování"
	Subcategory string `json:"subcategory" gorm:"size:100"`

	// Financial details
	Amount      float64 `json:"amount" gorm:"type:decimal(12,2)"`
	Currency    string  `json:"currency" gorm:"size:3;default:'CZK'"`
	VATRate     float64 `json:"vat_rate" gorm:"type:decimal(5,2);default:21"` // DPH sazba v %
	VATAmount   float64 `json:"vat_amount" gorm:"type:decimal(12,2)"`
	TotalAmount float64 `json:"total_amount" gorm:"type:decimal(12,2)"`

	// Expense details
	ExpenseDate   time.Time `json:"expense_date"`
	PaymentMethod string    `json:"payment_method" gorm:"size:100"` // "Hotovost", "Karta", "Faktura", "Proforma"

	// Receipt and documentation
	HasReceipt   bool   `json:"has_receipt" gorm:"default:false"`
	ReceiptData  string `json:"receipt_data" gorm:"type:text"` // OCR data z paragonu
	ReceiptImage string `json:"receipt_image" gorm:"size:500"` // cesta k obrázku paragonu

	// Approval workflow
	Status          string     `json:"status" gorm:"size:50;default:'pending'"` // "pending", "approved", "rejected", "reimbursed"
	ApprovedBy      uint       `json:"approved_by"`
	ApprovedAt      *time.Time `json:"approved_at"`
	RejectionReason string     `json:"rejection_reason" gorm:"type:text"`

	// Budget tracking
	BudgetID  *uint `json:"budget_id" gorm:"index"`
	TeamID    *uint `json:"team_id" gorm:"index"`    // přiřazení k týmu
	ProjectID *uint `json:"project_id" gorm:"index"` // přiřazení k projektu

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

	// Relations
	Budget    *Budget           `json:"budget,omitempty" gorm:"foreignKey:BudgetID"`
	Documents []ExpenseDocument `json:"documents,omitempty" gorm:"foreignKey:ExpenseID"`
}

// ExpenseDocument stores expense-related documents
type ExpenseDocument struct {
	ID        uint `json:"id" gorm:"primaryKey"`
	ExpenseID uint `json:"expense_id" gorm:"not null;index"`

	// Document details
	Name     string `json:"name" gorm:"not null;size:255"`
	Type     string `json:"type" gorm:"size:100"` // "Paragon", "Faktura", "Smlouva", "Jiný"
	FileName string `json:"file_name" gorm:"size:500"`
	FilePath string `json:"file_path" gorm:"size:500"`
	FileSize int64  `json:"file_size"`
	MimeType string `json:"mime_type" gorm:"size:100"`

	// OCR data for receipts
	OCRData     string  `json:"ocr_data" gorm:"type:text"`
	OCRAccuracy float64 `json:"ocr_accuracy" gorm:"type:decimal(5,2)"` // spolehlivost OCR v %

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

	// Relations
	Expense Expense `json:"expense,omitempty" gorm:"foreignKey:ExpenseID"`
}

// FinancialReport represents generated financial reports
type FinancialReport struct {
	ID uint `json:"id" gorm:"primaryKey"`

	// Report details
	Name   string `json:"name" gorm:"not null;size:255"`
	Type   string `json:"type" gorm:"size:100"`  // "monthly", "quarterly", "yearly", "custom"
	Period string `json:"period" gorm:"size:50"` // "2024-01", "Q1-2024", "2024", "custom"

	// Report data
	ReportData string `json:"report_data" gorm:"type:text"` // JSON s daty reportu
	Summary    string `json:"summary" gorm:"type:text"`

	// File generation
	FilePath    string    `json:"file_path" gorm:"size:500"`
	GeneratedAt time.Time `json:"generated_at"`

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

// FinancialSettings stores club-wide financial configuration
type FinancialSettings struct {
	ID uint `json:"id" gorm:"primaryKey"`

	// Budget settings
	DefaultCurrency string  `json:"default_currency" gorm:"size:3;default:'CZK'"`
	DefaultVATRate  float64 `json:"default_vat_rate" gorm:"type:decimal(5,2);default:21"`
	FiscalYearStart string  `json:"fiscal_year_start" gorm:"size:10;default:'01-01'"` // MM-DD format

	// Approval settings
	ExpenseApprovalRequired bool    `json:"expense_approval_required" gorm:"default:true"`
	MaxExpenseAutoApprove   float64 `json:"max_expense_auto_approve" gorm:"type:decimal(12,2);default:1000"`

	// Notification settings
	BudgetAlertEnabled      bool    `json:"budget_alert_enabled" gorm:"default:true"`
	BudgetAlertThreshold    float64 `json:"budget_alert_threshold" gorm:"type:decimal(5,2);default:80"`
	SponsorshipAlertEnabled bool    `json:"sponsorship_alert_enabled" gorm:"default:true"`

	// OCR settings
	OCRServiceEnabled bool   `json:"ocr_service_enabled" gorm:"default:true"`
	OCRProvider       string `json:"ocr_provider" gorm:"size:50;default:'tesseract'"` // "tesseract", "google", "azure"

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