package models

import (
	"strings"
	"time"

	"gorm.io/gorm"
)

type ProductInventoryStatus string

const (
	ProductInventoryStatusInStock     ProductInventoryStatus = "in_stock"
	ProductInventoryStatusSold        ProductInventoryStatus = "sold"
	ProductInventoryStatusMaintenance ProductInventoryStatus = "maintenance"
	ProductInventoryStatusRetired     ProductInventoryStatus = "retired"
)

type ProductInventory struct {
	ID              uint                   `gorm:"primaryKey" json:"id"`
	ProductCode     string                 `gorm:"size:64;not null;index" json:"productCode"`
	ProjectTypeCode string                 `gorm:"size:64;index" json:"projectTypeCode"`
	SuiteCode       string                 `gorm:"size:128;index" json:"suiteCode"`
	SerialNumber    *string                `gorm:"size:128;uniqueIndex" json:"serialNumber"`
	AssetName       string                 `gorm:"size:255" json:"assetName"`
	Status          ProductInventoryStatus `gorm:"size:32;not null;default:'in_stock';index" json:"status"`
	RegionID        *uint32                `gorm:"index" json:"regionId"`
	StorageLocation string                 `gorm:"size:255" json:"storageLocation"`
	SoldTargetType  string                 `gorm:"size:64;index" json:"soldTargetType"`
	SoldTargetName  string                 `gorm:"size:255" json:"soldTargetName"`
	SoldTo          string                 `gorm:"size:255" json:"soldTo"`
	SoldAt          *time.Time             `json:"soldAt"`
	ParameterValues string                 `gorm:"type:text" json:"parameterValues"`
	SourceType      string                 `gorm:"size:64;index" json:"sourceType"`
	SourceRef       string                 `gorm:"size:128;index" json:"sourceRef"`
	Notes           string                 `gorm:"size:1024" json:"notes"`
	CreatedAt       int64                  `gorm:"not null" json:"created_at"`
	UpdatedAt       int64                  `gorm:"not null" json:"updated_at"`
}

func (ProductInventory) TableName() string {
	return "product_inventories"
}

func (p *ProductInventory) BeforeCreate(tx *gorm.DB) (err error) {
	now := time.Now().UnixMilli()
	p.ProductCode = normalizeProductCodeValue(p.ProductCode)
	p.ProjectTypeCode = strings.TrimSpace(strings.ToLower(p.ProjectTypeCode))
	p.SuiteCode = strings.TrimSpace(p.SuiteCode)
	p.SerialNumber = normalizeOptionalProductString(p.SerialNumber)
	p.AssetName = strings.TrimSpace(p.AssetName)
	p.StorageLocation = strings.TrimSpace(p.StorageLocation)
	p.SoldTargetType = strings.TrimSpace(strings.ToLower(p.SoldTargetType))
	p.SoldTargetName = strings.TrimSpace(p.SoldTargetName)
	p.SoldTo = strings.TrimSpace(p.SoldTo)
	p.ParameterValues = normalizeJSONTextValue(p.ParameterValues)
	p.SourceType = strings.TrimSpace(strings.ToLower(p.SourceType))
	p.SourceRef = strings.TrimSpace(p.SourceRef)
	p.Notes = strings.TrimSpace(p.Notes)
	p.Status = normalizeProductInventoryStatus(p.Status)
	p.CreatedAt = now
	p.UpdatedAt = now
	return nil
}

func (p *ProductInventory) BeforeUpdate(tx *gorm.DB) (err error) {
	p.ProductCode = normalizeProductCodeValue(p.ProductCode)
	p.ProjectTypeCode = strings.TrimSpace(strings.ToLower(p.ProjectTypeCode))
	p.SuiteCode = strings.TrimSpace(p.SuiteCode)
	p.SerialNumber = normalizeOptionalProductString(p.SerialNumber)
	p.AssetName = strings.TrimSpace(p.AssetName)
	p.StorageLocation = strings.TrimSpace(p.StorageLocation)
	p.SoldTargetType = strings.TrimSpace(strings.ToLower(p.SoldTargetType))
	p.SoldTargetName = strings.TrimSpace(p.SoldTargetName)
	p.SoldTo = strings.TrimSpace(p.SoldTo)
	p.ParameterValues = normalizeJSONTextValue(p.ParameterValues)
	p.SourceType = strings.TrimSpace(strings.ToLower(p.SourceType))
	p.SourceRef = strings.TrimSpace(p.SourceRef)
	p.Notes = strings.TrimSpace(p.Notes)
	p.Status = normalizeProductInventoryStatus(p.Status)
	p.UpdatedAt = time.Now().UnixMilli()
	return nil
}

func normalizeOptionalProductString(value *string) *string {
	if value == nil {
		return nil
	}
	trimmed := strings.TrimSpace(*value)
	if trimmed == "" {
		return nil
	}
	return &trimmed
}

func normalizeProductInventoryStatus(status ProductInventoryStatus) ProductInventoryStatus {
	switch ProductInventoryStatus(strings.TrimSpace(strings.ToLower(string(status)))) {
	case ProductInventoryStatusSold:
		return ProductInventoryStatusSold
	case ProductInventoryStatusMaintenance:
		return ProductInventoryStatusMaintenance
	case ProductInventoryStatusRetired:
		return ProductInventoryStatusRetired
	default:
		return ProductInventoryStatusInStock
	}
}