| 1 | package billing |
| 2 | |
| 3 | import ( |
| 4 | "strings" |
| 5 | "time" |
| 6 | ) |
| 7 | |
| 8 | // LegacyUsageRecord is the minimum shape needed to migrate old telemetry. |
| 9 | type LegacyUsageRecord struct { |
| 10 | SessionCost float64 |
| 11 | SessionCurrency string |
| 12 | // EndedAt is retained for historical ordering and identity valuation dates. |
| 13 | EndedAt time.Time |
| 14 | // Tokens optional for ledger completeness. |
| 15 | PromptTokens int |
| 16 | CompletionTokens int |
| 17 | ModelRef string |
| 18 | UsageSource string |
| 19 | } |
| 20 | |
| 21 | // MigrateLegacyUsage builds a CostQuote from pre-CostQuote telemetry. |
| 22 | // Records that cannot be valued are marked legacy_estimate; wiped mixed-currency |
| 23 | // zeros are not reconstructed from current price tables. |
| 24 | func MigrateLegacyUsage(rec LegacyUsageRecord) CostQuote { |
| 25 | cur := NormalizeCurrency(rec.SessionCurrency) |
| 26 | if cur == "" { |
| 27 | // Historic defaults often used ¥ symbol without code. |
| 28 | if strings.Contains(rec.SessionCurrency, "¥") || strings.Contains(rec.SessionCurrency, "￥") { |
| 29 | cur = "CNY" |
| 30 | } else if strings.Contains(rec.SessionCurrency, "$") { |
| 31 | cur = "USD" |
| 32 | } |
| 33 | } |
| 34 | // Wiped mixed-currency totals (legacy code zeroed them) and empty rows must |
| 35 | // not be reconstructed from current price tables. |
| 36 | if rec.SessionCost <= 0 || cur == "" { |
| 37 | reason := "legacy_unrecoverable" |
| 38 | if rec.SessionCost == 0 && strings.TrimSpace(rec.SessionCurrency) != "" { |
| 39 | // Explicit zero with a currency often means a prior mixed-currency wipe. |
| 40 | reason = "legacy_wiped_or_zero" |
| 41 | } else if rec.SessionCost < 0 { |
| 42 | reason = "legacy_invalid_amount" |
| 43 | } |
| 44 | return CostQuote{ |
| 45 | Original: MoneyOf(Zero, cur), |
| 46 | Estimated: true, |
| 47 | CostComplete: false, |
| 48 | DisplayComplete: false, |
| 49 | Complete: false, |
| 50 | DisplayStatus: DisplayStatusUnavailable, |
| 51 | LegacyEstimate: true, |
| 52 | IncompleteReason: reason, |
| 53 | ModelRef: rec.ModelRef, |
| 54 | UsageSource: rec.UsageSource, |
| 55 | } |
| 56 | } |
| 57 | amount := NewAmountFromFloat(rec.SessionCost) |
| 58 | q := CostQuote{ |
| 59 | Original: MoneyOf(amount, cur), |
| 60 | Valuations: map[string]Valuation{}, |
| 61 | Estimated: true, |
| 62 | CostComplete: true, |
| 63 | DisplayComplete: true, |
| 64 | Complete: true, |
| 65 | DisplayStatus: DisplayStatusMatched, |
| 66 | AggregateMode: AggregateModeSingleCurrency, |
| 67 | LegacyEstimate: true, |
| 68 | ModelRef: rec.ModelRef, |
| 69 | UsageSource: rec.UsageSource, |
| 70 | BillingMode: BillingModePAYG, |
| 71 | } |
| 72 | ended := rec.EndedAt |
| 73 | if ended.IsZero() { |
| 74 | ended = time.Now().UTC() |
| 75 | } |
| 76 | asOf := ended.UTC().Format("2006-01-02") |
| 77 | q.Valuations[cur] = Valuation{ |
| 78 | Money: q.Original, |
| 79 | Basis: BasisIdentity, |
| 80 | Source: "legacy_telemetry", |
| 81 | AsOf: asOf, |
| 82 | } |
| 83 | m := q.Original |
| 84 | q.Selected = &m |
| 85 | return q |
| 86 | } |
| 87 |