pricing.go

// Package pricing does a static on-demand EC2 price lookup for the setup
// cost estimate. We deliberately skip the AWS Pricing API: it needs extra
// IAM permissions, and a hand-maintained table is plenty for a rough
// estimate.
package pricing

import "strings"

// perHourUSD maps an instance type to its on-demand Linux $/hr in us-east-1
// (April 2026 snapshot).
var perHourUSD = map[string]float64{
	// Intel compute-optimized
	"c5.large":    0.0850,
	"c5.xlarge":   0.1700,
	"c5.2xlarge":  0.3400,
	"c5.4xlarge":  0.6800,
	"c5.9xlarge":  1.5300,
	"c5.12xlarge": 2.0400,
	"c5.18xlarge": 3.0600,
	"c5.24xlarge": 4.0800,

	"c5n.large":    0.1080,
	"c5n.xlarge":   0.2160,
	"c5n.2xlarge":  0.4320,
	"c5n.4xlarge":  0.8640,
	"c5n.9xlarge":  1.9440,
	"c5n.18xlarge": 3.8880,

	"c6i.large":    0.0850,
	"c6i.xlarge":   0.1700,
	"c6i.2xlarge":  0.3400,
	"c6i.4xlarge":  0.6800,
	"c6i.8xlarge":  1.3600,
	"c6i.12xlarge": 2.0400,
	"c6i.16xlarge": 2.7200,
	"c6i.24xlarge": 4.0800,
	"c6i.32xlarge": 5.4400,

	"c7i.large":    0.0893,
	"c7i.xlarge":   0.1785,
	"c7i.2xlarge":  0.3570,
	"c7i.4xlarge":  0.7140,
	"c7i.8xlarge":  1.4280,
	"c7i.12xlarge": 2.1420,
	"c7i.16xlarge": 2.8560,
	"c7i.24xlarge": 4.2840,
	"c7i.48xlarge": 8.5680,

	// AMD compute-optimized
	"c5a.large":    0.0770,
	"c5a.xlarge":   0.1540,
	"c5a.2xlarge":  0.3080,
	"c5a.4xlarge":  0.6160,
	"c5a.8xlarge":  1.2320,
	"c5a.12xlarge": 1.8480,
	"c5a.16xlarge": 2.4640,
	"c5a.24xlarge": 3.6960,

	"c6a.large":    0.0765,
	"c6a.xlarge":   0.1530,
	"c6a.2xlarge":  0.3060,
	"c6a.4xlarge":  0.6120,
	"c6a.8xlarge":  1.2240,
	"c6a.12xlarge": 1.8360,
	"c6a.16xlarge": 2.4480,
	"c6a.24xlarge": 3.6720,
	"c6a.32xlarge": 4.8960,
	"c6a.48xlarge": 7.3440,

	// Graviton compute-optimized
	"c6g.large":    0.0680,
	"c6g.xlarge":   0.1360,
	"c6g.2xlarge":  0.2720,
	"c6g.4xlarge":  0.5440,
	"c6g.8xlarge":  1.0880,
	"c6g.12xlarge": 1.6320,
	"c6g.16xlarge": 2.1760,

	"c6gn.large":    0.0864,
	"c6gn.xlarge":   0.1728,
	"c6gn.2xlarge":  0.3456,
	"c6gn.4xlarge":  0.6912,
	"c6gn.8xlarge":  1.3824,
	"c6gn.12xlarge": 2.0736,
	"c6gn.16xlarge": 2.7648,

	"c7g.large":    0.0725,
	"c7g.xlarge":   0.1450,
	"c7g.2xlarge":  0.2900,
	"c7g.4xlarge":  0.5800,
	"c7g.8xlarge":  1.1600,
	"c7g.12xlarge": 1.7400,
	"c7g.16xlarge": 2.3200,

	"c7gn.large":    0.0998,
	"c7gn.xlarge":   0.1996,
	"c7gn.2xlarge":  0.3992,
	"c7gn.4xlarge":  0.7984,
	"c7gn.8xlarge":  1.5968,
	"c7gn.12xlarge": 2.3952,
	"c7gn.16xlarge": 3.1936,

	// First-gen Graviton
	"a1.medium":  0.0255,
	"a1.large":   0.0510,
	"a1.xlarge":  0.1020,
	"a1.2xlarge": 0.2040,
	"a1.4xlarge": 0.4080,
	"a1.metal":   0.4080,

	// General-purpose and burstable
	"m5.large":   0.0960,
	"m5.xlarge":  0.1920,
	"m5.2xlarge": 0.3840,
	"m5.4xlarge": 0.7680,

	"m6i.large":   0.0960,
	"m6i.xlarge":  0.1920,
	"m6i.2xlarge": 0.3840,
	"m6i.4xlarge": 0.7680,

	"m6g.large":   0.0770,
	"m6g.xlarge":  0.1540,
	"m6g.2xlarge": 0.3080,
	"m6g.4xlarge": 0.6160,

	"m7g.large":    0.0816,
	"m7g.xlarge":   0.1632,
	"m7g.2xlarge":  0.3264,
	"m7g.4xlarge":  0.6528,
	"m7g.8xlarge":  1.3056,
	"m7g.12xlarge": 1.9584,
	"m7g.16xlarge": 2.6112,

	"t3.medium":  0.0416,
	"t3.large":   0.0832,
	"t4g.medium": 0.0336,
	"t4g.large":  0.0672,
}

// PerHour returns the estimated on-demand USD/hour for an instance type,
// plus whether the type is known. Only us-east-1 prices are tracked; other
// regions get a rough multiplier.
func PerHour(instanceType, region string) (float64, bool) {
	p, ok := perHourUSD[strings.ToLower(instanceType)]
	if !ok {
		return 0, false
	}
	switch region {
	case "us-east-1", "us-east-2":
		return p, true
	case "us-west-1", "us-west-2":
		return p * 1.00, true
	case "eu-west-1", "eu-west-2", "eu-central-1":
		return p * 1.08, true
	case "ap-southeast-1", "ap-southeast-2", "ap-northeast-1":
		return p * 1.18, true
	default:
		return p, true
	}
}

// Known reports whether the instance type is in the price table.
func Known(instanceType string) bool {
	_, ok := perHourUSD[strings.ToLower(instanceType)]
	return ok
}