package customer

import (
	"github.com/google/uuid"
)

// CustomerStatus represents customer account status
type CustomerStatus string

const (
	CustomerStatusActive    CustomerStatus = "active"
	CustomerStatusInactive  CustomerStatus = "inactive"
	CustomerStatusSuspended CustomerStatus = "suspended"
	CustomerStatusPending   CustomerStatus = "pending"
)

// CustomerType represents the type of customer
type CustomerType string

const (
	CustomerTypeIndividual CustomerType = "individual"
	CustomerTypeCompany    CustomerType = "company"
	CustomerTypeGovernment CustomerType = "government"
)

// Customer represents a customer in the tender management system
type Customer struct {
	ID        uuid.UUID      `bson:"_id"`
	Type      CustomerType   `bson:"type"`
	Status    CustomerStatus `bson:"status"`
	CompanyID *uuid.UUID     `bson:"company_id,omitempty"`

	// Individual customer fields
	FirstName *string `bson:"first_name,omitempty"`
	LastName  *string `bson:"last_name,omitempty"`
	FullName  *string `bson:"full_name,omitempty"`
	Username  string  `bson:"username"` // Username for authentication
	Email     string  `bson:"email"`
	Password  string  `bson:"password"` // Hashed password for authentication
	Phone     *string `bson:"phone,omitempty"`
	Mobile    *string `bson:"mobile,omitempty"`

	// Company customer fields
	CompanyName        *string `bson:"company_name,omitempty"`
	RegistrationNumber *string `bson:"registration_number,omitempty"`
	TaxID              *string `bson:"tax_id,omitempty"`
	Industry           *string `bson:"industry,omitempty"`

	// Address information
	Address *Address `bson:"address,omitempty"`

	// Business information
	BusinessType  *string  `bson:"business_type,omitempty"`
	EmployeeCount *int     `bson:"employee_count,omitempty"`
	AnnualRevenue *float64 `bson:"annual_revenue,omitempty"`
	FoundedYear   *int     `bson:"founded_year,omitempty"`

	// Contact person (for company customers)
	ContactPerson *ContactPerson `bson:"contact_person,omitempty"`

	// Verification and compliance
	IsVerified      bool    `bson:"is_verified"`
	IsCompliant     bool    `bson:"is_compliant"`
	ComplianceNotes *string `bson:"compliance_notes,omitempty"`

	// Preferences and settings
	Language string `bson:"language"` // Default: "en"
	Currency string `bson:"currency"` // Default: "USD"
	Timezone string `bson:"timezone"` // Default: "UTC"

	// Audit fields
	CreatedAt int64      `bson:"created_at"` // Unix timestamp
	UpdatedAt int64      `bson:"updated_at"` // Unix timestamp
	CreatedBy *uuid.UUID `bson:"created_by,omitempty"`
	UpdatedBy *uuid.UUID `bson:"updated_by,omitempty"`
}

// Address represents a customer's address
type Address struct {
	Street      string `bson:"street"`
	City        string `bson:"city"`
	State       string `bson:"state"`
	PostalCode  string `bson:"postal_code"`
	Country     string `bson:"country"`
	AddressType string `bson:"address_type"` // billing, shipping, etc.
	IsDefault   bool   `bson:"is_default"`
}

// ContactPerson represents a contact person for company customers
type ContactPerson struct {
	FirstName string  `bson:"first_name"`
	LastName  string  `bson:"last_name"`
	FullName  string  `bson:"full_name"`
	Position  string  `bson:"position"`
	Email     string  `bson:"email"`
	Phone     string  `bson:"phone"`
	Mobile    *string `bson:"mobile,omitempty"`
	IsPrimary bool    `bson:"is_primary"`
}

// CustomerResponse represents the customer data sent in API responses
type CustomerResponse struct {
	ID                 string         `json:"id"`
	Type               string         `json:"type"`
	Status             string         `json:"status"`
	CompanyID          *string        `json:"company_id,omitempty"`
	FirstName          *string        `json:"first_name,omitempty"`
	LastName           *string        `json:"last_name,omitempty"`
	FullName           *string        `json:"full_name,omitempty"`
	Email              string         `json:"email"`
	Phone              *string        `json:"phone,omitempty"`
	Mobile             *string        `json:"mobile,omitempty"`
	CompanyName        *string        `json:"company_name,omitempty"`
	RegistrationNumber *string        `json:"registration_number,omitempty"`
	TaxID              *string        `json:"tax_id,omitempty"`
	Industry           *string        `json:"industry,omitempty"`
	Address            *Address       `json:"address,omitempty"`
	BusinessType       *string        `json:"business_type,omitempty"`
	EmployeeCount      *int           `json:"employee_count,omitempty"`
	AnnualRevenue      *float64       `json:"annual_revenue,omitempty"`
	FoundedYear        *int           `json:"founded_year,omitempty"`
	ContactPerson      *ContactPerson `json:"contact_person,omitempty"`
	IsVerified         bool           `json:"is_verified"`
	IsCompliant        bool           `json:"is_compliant"`
	ComplianceNotes    *string        `json:"compliance_notes,omitempty"`
	Language           string         `json:"language"`
	Username           string         `json:"username"`
	Currency           string         `json:"currency"`
	Timezone           string         `json:"timezone"`
	CreatedAt          int64          `json:"created_at"`
	UpdatedAt          int64          `json:"updated_at"`
	CreatedBy          *string        `json:"created_by,omitempty"`
	UpdatedBy          *string        `json:"updated_by,omitempty"`
}

// ToResponse converts Customer to CustomerResponse
func (c *Customer) ToResponse() *CustomerResponse {
	companyID := ""
	if c.CompanyID != nil {
		companyID = c.CompanyID.String()
	}

	createdBy := ""
	if c.CreatedBy != nil {
		createdBy = c.CreatedBy.String()
	}

	updatedBy := ""
	if c.UpdatedBy != nil {
		updatedBy = c.UpdatedBy.String()
	}

	return &CustomerResponse{
		ID:                 c.ID.String(),
		Type:               string(c.Type),
		Status:             string(c.Status),
		CompanyID:          &companyID,
		FirstName:          c.FirstName,
		LastName:           c.LastName,
		FullName:           c.FullName,
		Username:           c.Username,
		Email:              c.Email,
		Phone:              c.Phone,
		Mobile:             c.Mobile,
		CompanyName:        c.CompanyName,
		RegistrationNumber: c.RegistrationNumber,
		TaxID:              c.TaxID,
		Industry:           c.Industry,
		Address:            c.Address,
		BusinessType:       c.BusinessType,
		EmployeeCount:      c.EmployeeCount,
		AnnualRevenue:      c.AnnualRevenue,
		FoundedYear:        c.FoundedYear,
		ContactPerson:      c.ContactPerson,
		IsVerified:         c.IsVerified,
		IsCompliant:        c.IsCompliant,
		ComplianceNotes:    c.ComplianceNotes,
		Language:           c.Language,
		Currency:           c.Currency,
		Timezone:           c.Timezone,
		CreatedAt:          c.CreatedAt,
		UpdatedAt:          c.UpdatedAt,
		CreatedBy:          &createdBy,
		UpdatedBy:          &updatedBy,
	}
}