1package provider
2
3import (
4 "encoding/json"
5 "os"
6)
7
8// UserModelsFile is the JSON format for user-defined models.
9// Place a models.json in $ZOT_HOME to add models that aren't in the
10// baked-in catalog or to override catalog entries.
11//
12// Example:
13//
14// {
15// "providers": {
16// "openai": {
17// "models": [
18// {
19// "id": "gpt-5.5",
20// "name": "GPT-5.5",
21// "reasoning": true,
22// "contextWindow": 400000,
23// "maxTokens": 128000,
24// "priceInput": 2.50,
25// "priceOutput": 15.00,
26// "priceCacheRead": 0.25
27// }
28// ]
29// }
30// }
31// }
32type UserModelsFile struct {
33 Providers map[string]UserProvider `json:"providers"`
34}
35
36// UserProvider groups models under a provider key.
37type UserProvider struct {
38 Models []UserModel `json:"models"`
39}
40
41// UserModel is a single model entry in the user's models.json.
42type UserModel struct {
43 ID string `json:"id"`
44 Name string `json:"name"`
45 Reasoning bool `json:"reasoning"`
46 ContextWindow int `json:"contextWindow"`
47 MaxTokens int `json:"maxTokens"`
48 PriceInput float64 `json:"priceInput"`
49 PriceOutput float64 `json:"priceOutput"`
50 PriceCacheRead float64 `json:"priceCacheRead"`
51 PriceCacheWrite float64 `json:"priceCacheWrite"`
52 BaseURL string `json:"baseUrl,omitempty"`
53 Input []string `json:"input"` // informational only
54 API string `json:"api"` // informational only
55}
56
57// LoadUserModels reads a models.json file and returns the models
58// converted to the internal Model type. Returns nil on any error
59// (missing file, bad JSON, etc.) so the caller can treat it as
60// optional without error handling.
61func LoadUserModels(path string) []Model {
62 data, err := os.ReadFile(path)
63 if err != nil {
64 return nil
65 }
66 var file UserModelsFile
67 if err := json.Unmarshal(data, &file); err != nil {
68 return nil
69 }
70
71 var out []Model
72 for providerName, prov := range file.Providers {
73 // Normalize provider name: strip suffixes like "-codex" so
74 // "openai-codex" maps to "openai".
75 normalized := providerName
76 switch providerName {
77 case "openai-codex", "openai-responses":
78 normalized = "openai"
79 case "anthropic-messages":
80 normalized = "anthropic"
81 }
82
83 for _, um := range prov.Models {
84 m := Model{
85 Provider: normalized,
86 ID: um.ID,
87 DisplayName: um.Name,
88 ContextWindow: um.ContextWindow,
89 MaxOutput: um.MaxTokens,
90 Reasoning: um.Reasoning,
91 PriceInput: um.PriceInput,
92 PriceOutput: um.PriceOutput,
93 PriceCacheRead: um.PriceCacheRead,
94 PriceCacheWrite: um.PriceCacheWrite,
95 BaseURL: um.BaseURL,
96 Source: "user",
97 }
98 if m.DisplayName == "" {
99 m.DisplayName = m.ID
100 }
101 out = append(out, m)
102 }
103 }
104 return out
105}
106
107// SetUserModels merges user-defined models into the active catalog.
108// User models take precedence over both the baked-in catalog and
109// live-discovered models.
110func SetUserModels(models []Model) {
111 if len(models) == 0 {
112 return
113 }
114 activeMu.Lock()
115 defer activeMu.Unlock()
116
117 // Build index of current active models.
118 byKey := func(p, id string) string { return p + "/" + id }
119 index := make(map[string]int, len(active))
120 for i, m := range active {
121 index[byKey(m.Provider, m.ID)] = i
122 }
123
124 for _, um := range models {
125 k := byKey(um.Provider, um.ID)
126 if idx, ok := index[k]; ok {
127 // Override existing entry but keep prices from user if
128 // they provided them, otherwise keep catalog prices.
129 existing := active[idx]
130 if um.PriceInput > 0 {
131 existing.PriceInput = um.PriceInput
132 }
133 if um.PriceOutput > 0 {
134 existing.PriceOutput = um.PriceOutput
135 }
136 if um.PriceCacheRead > 0 {
137 existing.PriceCacheRead = um.PriceCacheRead
138 }
139 if um.PriceCacheWrite > 0 {
140 existing.PriceCacheWrite = um.PriceCacheWrite
141 }
142 if um.DisplayName != "" {
143 existing.DisplayName = um.DisplayName
144 }
145 if um.ContextWindow > 0 {
146 existing.ContextWindow = um.ContextWindow
147 }
148 if um.MaxOutput > 0 {
149 existing.MaxOutput = um.MaxOutput
150 }
151 existing.Reasoning = um.Reasoning
152 if um.BaseURL != "" {
153 existing.BaseURL = um.BaseURL
154 }
155 existing.Source = "user"
156 existing.Speculative = false
157 active[idx] = existing
158 } else {
159 // New model not in catalog.
160 active = append(active, um)
161 }
162 }
163}