package models

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

type AlertType string

const (
	AlertHighDemandStalePrice AlertType = "high_demand_stale_price"
	AlertPriceSpike           AlertType = "price_spike"
	AlertPriceDrop            AlertType = "price_drop"
	AlertNoRecentQuotes       AlertType = "no_recent_quotes"
	AlertTrendingNoPrice      AlertType = "trending_no_price"
)

type AlertSeverity string

const (
	SeverityLow      AlertSeverity = "low"
	SeverityMedium   AlertSeverity = "medium"
	SeverityHigh     AlertSeverity = "high"
	SeverityCritical AlertSeverity = "critical"
)

type AlertStatus string

const (
	AlertStatusNew          AlertStatus = "new"
	AlertStatusAcknowledged AlertStatus = "acknowledged"
	AlertStatusResolved     AlertStatus = "resolved"
	AlertStatusIgnored      AlertStatus = "ignored"
)

type AlertDetails map[string]interface{}

func (d AlertDetails) Value() (driver.Value, error) {
	return json.Marshal(d)
}

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

type PricingAlert struct {
	ID        uint          `gorm:"primaryKey;autoIncrement" json:"id"`
	LotName   string        `gorm:"size:255;not null" json:"lot_name"`
	AlertType AlertType     `gorm:"type:enum('high_demand_stale_price','price_spike','price_drop','no_recent_quotes','trending_no_price');not null" json:"alert_type"`
	Severity  AlertSeverity `gorm:"type:enum('low','medium','high','critical');default:'medium'" json:"severity"`
	Message   string        `gorm:"type:text;not null" json:"message"`
	Details   AlertDetails  `gorm:"type:json" json:"details"`
	Status    AlertStatus   `gorm:"type:enum('new','acknowledged','resolved','ignored');default:'new'" json:"status"`
	CreatedAt time.Time     `gorm:"autoCreateTime" json:"created_at"`
}

func (PricingAlert) TableName() string {
	return "qt_pricing_alerts"
}

type TrendDirection string

const (
	TrendUp     TrendDirection = "up"
	TrendStable TrendDirection = "stable"
	TrendDown   TrendDirection = "down"
)

type ComponentUsageStats struct {
	LotName        string         `gorm:"column:lot_name;primaryKey;size:255" json:"lot_name"`
	QuotesTotal    int            `gorm:"default:0" json:"quotes_total"`
	QuotesLast30d  int            `gorm:"default:0" json:"quotes_last_30d"`
	QuotesLast7d   int            `gorm:"default:0" json:"quotes_last_7d"`
	TotalQuantity  int            `gorm:"default:0" json:"total_quantity"`
	TotalRevenue   float64        `gorm:"type:decimal(14,2);default:0" json:"total_revenue"`
	TrendDirection TrendDirection `gorm:"type:enum('up','stable','down');default:'stable'" json:"trend_direction"`
	TrendPercent   float64        `gorm:"type:decimal(5,2);default:0" json:"trend_percent"`
	LastUsedAt     *time.Time     `json:"last_used_at"`
}

func (ComponentUsageStats) TableName() string {
	return "qt_component_usage_stats"
}