package models

import (
	"database/sql/driver"
	"encoding/json"
	"errors"
	"time"
)

type ConfigItem struct {
	LotName   string  `json:"lot_name"`
	Quantity  int     `json:"quantity"`
	UnitPrice float64 `json:"unit_price"`
}

type ConfigItems []ConfigItem

func (c ConfigItems) Value() (driver.Value, error) {
	return json.Marshal(c)
}

func (c *ConfigItems) Scan(value interface{}) error {
	if value == nil {
		*c = make(ConfigItems, 0)
		return nil
	}
	bytes, ok := value.([]byte)
	if !ok {
		return errors.New("type assertion to []byte failed")
	}
	return json.Unmarshal(bytes, c)
}

func (c ConfigItems) Total() float64 {
	var total float64
	for _, item := range c {
		total += item.UnitPrice * float64(item.Quantity)
	}
	return total
}

type Configuration struct {
	ID             uint        `gorm:"primaryKey;autoIncrement" json:"id"`
	UUID           string      `gorm:"size:36;uniqueIndex;not null" json:"uuid"`
	UserID         *uint       `json:"user_id,omitempty"` // Legacy field, no longer required for ownership
	OwnerUsername  string      `gorm:"size:100;not null;default:'';index" json:"owner_username"`
	AppVersion     string      `gorm:"size:64" json:"app_version,omitempty"`
	Name           string      `gorm:"size:200;not null" json:"name"`
	Items          ConfigItems `gorm:"type:json;not null" json:"items"`
	TotalPrice     *float64    `gorm:"type:decimal(12,2)" json:"total_price"`
	CustomPrice    *float64    `gorm:"type:decimal(12,2)" json:"custom_price"`
	Notes          string      `gorm:"type:text" json:"notes"`
	IsTemplate     bool        `gorm:"default:false" json:"is_template"`
	ServerCount    int         `gorm:"default:1" json:"server_count"`
	PriceUpdatedAt *time.Time  `gorm:"type:timestamp" json:"price_updated_at,omitempty"`
	CreatedAt      time.Time   `gorm:"autoCreateTime" json:"created_at"`

	User *User `gorm:"foreignKey:UserID" json:"user,omitempty"`
}

func (Configuration) TableName() string {
	return "qt_configurations"
}

type PriceOverride struct {
	ID         uint       `gorm:"primaryKey;autoIncrement" json:"id"`
	LotName    string     `gorm:"size:255;not null" json:"lot_name"`
	Price      float64    `gorm:"type:decimal(12,2);not null" json:"price"`
	ValidFrom  time.Time  `gorm:"type:date;not null" json:"valid_from"`
	ValidUntil *time.Time `gorm:"type:date" json:"valid_until"`
	Reason     string     `gorm:"type:text" json:"reason"`
	CreatedBy  uint       `gorm:"not null" json:"created_by"`

	Creator *User `gorm:"foreignKey:CreatedBy" json:"creator,omitempty"`
}

func (PriceOverride) TableName() string {
	return "qt_price_overrides"
}