package spread

// CutRate is the only number in Spread's business model: we keep this
// fraction of the savings we find, and nothing else. If savings are zero,
// our cut is zero.
const CutRate = 0.20

// LineItem is one row of an uploaded bill of materials, after parsing.
// UnitPrice is what the customer pays today (their "market" price).
type LineItem struct {
	Line         int     `json:"line"`
	PartNumber   string  `json:"part_number"`
	Description  string  `json:"description"`
	Manufacturer string  `json:"manufacturer,omitempty"`
	Quantity     float64 `json:"quantity"`
	UnitPrice    float64 `json:"unit_price"`
}

// AnalyzedLine is a LineItem re-quoted against the supplier catalog.
type AnalyzedLine struct {
	LineItem
	SpreadPrice float64 `json:"spread_price"`
	UnitSaving  float64 `json:"unit_saving"`
	LineMarket  float64 `json:"line_market"`
	LineSpread  float64 `json:"line_spread"`
	LineSaving  float64 `json:"line_saving"`
	// Matched is true when the part was found by exact part number in the
	// catalog; false when the price was estimated from the category model.
	Matched bool `json:"matched"`
}

// Totals is the summary block shown under the table.
type Totals struct {
	Lines      int     `json:"lines"`
	Market     float64 `json:"market"`
	Spread     float64 `json:"spread"`
	Savings    float64 `json:"savings"`
	OurCut     float64 `json:"our_cut"`
	NetSavings float64 `json:"net_savings"`
	CutRate    float64 `json:"cut_rate"`
}

// Report is the full analysis returned to the client.
type Report struct {
	BOMRef string         `json:"bom_ref"`
	Lines  []AnalyzedLine `json:"lines"`
	Totals Totals         `json:"totals"`
}