1package modes
2
3import (
4 "fmt"
5 "strings"
6 "time"
7
8 "github.com/patriceckhart/zot/internal/core"
9 "github.com/patriceckhart/zot/internal/tui"
10)
11
12// sessionDialog is the inline picker shown when the user runs /sessions.
13type sessionDialog struct {
14 active bool
15 sessions []core.SessionSummary
16 cursor int
17 renaming bool
18 rename string
19
20 // MaxRows is the maximum number of session rows the dialog
21 // will render in a single frame. Set by the host right before
22 // Render based on the available chat space; if 0, the dialog
23 // falls back to rendering every row (original behaviour).
24 // When the list is longer than MaxRows the dialog scrolls so
25 // the cursor stays visible and tags the first/last visible
26 // entry with a muted "↑ N more" / "↓ N more" row so the user
27 // knows there's offscreen content.
28 MaxRows int
29
30 // viewTop is the index of the first session currently drawn.
31 // Adjusted to follow the cursor on up/down moves.
32 viewTop int
33}
34
35// sessionDialogAction is returned by HandleKey.
36type sessionDialogAction struct {
37 Select bool
38 Path string
39 Close bool
40 Renamed bool
41}
42
43func newSessionDialog() *sessionDialog { return &sessionDialog{} }
44
45// Open populates the dialog from root + cwd and shows it. Empty
46// sessions (zero messages) are filtered out so the currently-running
47// session, a freshly-opened one that hasn't received a prompt yet,
48// and any stale empties that haven't been pruned yet all stay out
49// of the picker. Resuming an empty session is a no-op anyway.
50func (d *sessionDialog) Open(root, cwd string) {
51 all := core.DescribeSessions(root, cwd)
52 filtered := make([]core.SessionSummary, 0, len(all))
53 for _, s := range all {
54 if s.MessageCount == 0 {
55 continue
56 }
57 filtered = append(filtered, s)
58 }
59 d.sessions = filtered
60 d.cursor = 0
61 d.viewTop = 0
62 d.active = true
63}
64
65// CursorPos returns the row/col for the terminal cursor when in
66// rename mode. Returns -1, -1 otherwise.
67func (d *sessionDialog) CursorPos() (row, col int) {
68 if !d.renaming {
69 return -1, -1
70 }
71 // Row: frameHeader(1) + rename hint(1) = row 2 (0-indexed)
72 // Col: 2 spaces indent + text length
73 return 2, 2 + len([]rune(d.rename))
74}
75
76// Close hides the dialog.
77func (d *sessionDialog) Close() { d.active = false }
78
79// Active reports whether the dialog is visible and consumes input.
80func (d *sessionDialog) Active() bool { return d != nil && d.active }
81
82// Render returns the dialog lines.
83func (d *sessionDialog) Render(th tui.Theme, width int) []string {
84 if !d.Active() {
85 return nil
86 }
87 var lines []string
88 lines = append(lines, frameHeader(th, "sessions", width))
89 if len(d.sessions) == 0 {
90 lines = append(lines, th.FG256(th.Muted, "no previous sessions for this directory"))
91 lines = append(lines, th.FG256(th.Muted, "press esc to close"))
92 lines = append(lines, frameRule(th, width))
93 return lines
94 }
95 if d.renaming {
96 lines = append(lines, th.FG256(th.Muted, "rename session (enter to save, esc to cancel):"))
97 lines = append(lines, " "+th.FG256(th.FG, d.rename))
98 lines = append(lines, frameRule(th, width))
99 return lines
100 }
101 lines = append(lines, th.FG256(th.Muted, "pick a session (↑/↓, pgup/pgdn, enter resume, r rename, esc cancel)"))
102
103 // Viewport: windowed slice of d.sessions around d.cursor so a
104 // list taller than the terminal still scrolls. Caller sets
105 // MaxRows to the number of rows available for session entries
106 // (i.e. excluding the header, hint, chrome). When it's zero or
107 // bigger than the list, we draw everything.
108 total := len(d.sessions)
109 window := d.MaxRows
110 if window <= 0 || window >= total {
111 window = total
112 }
113 d.viewTop = clampViewTop(d.viewTop, d.cursor, window, total)
114 viewBot := d.viewTop + window
115 if viewBot > total {
116 viewBot = total
117 }
118
119 // Top indicator: how many rows are above the viewport.
120 if d.viewTop > 0 {
121 hidden := d.viewTop
122 lines = append(lines, th.FG256(th.Muted, fmt.Sprintf(" ↑ %d more above", hidden)))
123 }
124 for i := d.viewTop; i < viewBot; i++ {
125 s := d.sessions[i]
126 plain := " " + formatSessionRowPlain(s, width-2)
127 if i == d.cursor {
128 lines = append(lines, th.PadHighlight(plain, width))
129 } else {
130 lines = append(lines, th.FG256(th.Muted, plain))
131 }
132 }
133 // Bottom indicator: how many rows are below the viewport.
134 if viewBot < total {
135 hidden := total - viewBot
136 lines = append(lines, th.FG256(th.Muted, fmt.Sprintf(" ↓ %d more below", hidden)))
137 }
138 lines = append(lines, frameRule(th, width))
139 return lines
140}
141
142// clampViewTop returns a viewTop that keeps cursor visible in a
143// window of the given size over a list of `total` rows. Leaves one
144// row of padding above/below where possible so moving the cursor
145// doesn't land right on the top/bottom edge — easier to see what
146// direction you're moving.
147func clampViewTop(viewTop, cursor, window, total int) int {
148 if window <= 0 || total <= 0 {
149 return 0
150 }
151 if window >= total {
152 return 0
153 }
154 pad := 2
155 if window < 6 {
156 pad = 0
157 }
158 if cursor < viewTop+pad {
159 viewTop = cursor - pad
160 }
161 if cursor >= viewTop+window-pad {
162 viewTop = cursor - window + pad + 1
163 }
164 if viewTop < 0 {
165 viewTop = 0
166 }
167 if viewTop+window > total {
168 viewTop = total - window
169 }
170 return viewTop
171}
172
173// formatSessionRowPlain returns the session row body without any ANSI
174// styling so the caller can wrap it in either a plain mute color or a
175// full-row selection highlight. The returned string is guaranteed to
176// fit within maxWidth visible characters so the terminal never soft-
177// wraps it into the next row.
178func formatSessionRowPlain(s core.SessionSummary, maxWidth int) string {
179 when := formatRelative(s.Started)
180 summary := strings.TrimSpace(s.Title)
181 if summary == "" {
182 summary = strings.TrimSpace(s.FirstUserText)
183 }
184 if summary == "" {
185 summary = "(empty)"
186 }
187 summary = strings.ReplaceAll(summary, "\n", " ")
188 left := fmt.Sprintf("%-14s %s/%s %d msgs $%.4f ",
189 when, s.Provider, s.Model, s.MessageCount, s.TotalCost)
190 room := maxWidth - len([]rune(left))
191 if room < 4 {
192 room = 4
193 }
194 runes := []rune(summary)
195 if len(runes) > room {
196 summary = string(runes[:room-3]) + "..."
197 }
198 row := left + summary
199 // Hard clamp: ensure the full row never exceeds maxWidth.
200 rowRunes := []rune(row)
201 if len(rowRunes) > maxWidth {
202 if maxWidth <= 3 {
203 row = strings.Repeat(".", maxWidth)
204 } else {
205 row = string(rowRunes[:maxWidth-3]) + "..."
206 }
207 }
208 return row
209}
210
211func formatRelative(t time.Time) string {
212 if t.IsZero() {
213 return "unknown"
214 }
215 d := time.Since(t)
216 switch {
217 case d < time.Minute:
218 return "just now"
219 case d < time.Hour:
220 return fmt.Sprintf("%d min ago", int(d.Minutes()))
221 case d < 24*time.Hour:
222 return fmt.Sprintf("%d h ago", int(d.Hours()))
223 case d < 7*24*time.Hour:
224 return fmt.Sprintf("%d d ago", int(d.Hours()/24))
225 default:
226 return t.Local().Format("2006-01-02")
227 }
228}
229
230// HandleKey advances the dialog and returns an action to apply, if any.
231func (d *sessionDialog) HandleKey(k tui.Key) sessionDialogAction {
232 // Rename mode: type the new name.
233 if d.renaming {
234 switch k.Kind {
235 case tui.KeyEnter:
236 title := strings.TrimSpace(d.rename)
237 if title != "" && d.cursor < len(d.sessions) {
238 path := d.sessions[d.cursor].Path
239 _ = core.RenameSession(path, title)
240 d.sessions[d.cursor].Title = title
241 }
242 d.renaming = false
243 d.rename = ""
244 return sessionDialogAction{Renamed: true}
245 case tui.KeyEsc:
246 d.renaming = false
247 d.rename = ""
248 return sessionDialogAction{}
249 case tui.KeyBackspace:
250 if len(d.rename) > 0 {
251 r := []rune(d.rename)
252 d.rename = string(r[:len(r)-1])
253 }
254 return sessionDialogAction{}
255 case tui.KeyPaste:
256 d.rename += k.Paste
257 return sessionDialogAction{}
258 case tui.KeyRune:
259 if k.Rune != 0 {
260 d.rename += string(k.Rune)
261 }
262 return sessionDialogAction{}
263 }
264 return sessionDialogAction{}
265 }
266
267 page := d.MaxRows
268 if page <= 0 {
269 page = 10
270 }
271 if page > 1 {
272 page--
273 }
274 switch k.Kind {
275 case tui.KeyUp:
276 if d.cursor > 0 {
277 d.cursor--
278 }
279 case tui.KeyDown:
280 if d.cursor < len(d.sessions)-1 {
281 d.cursor++
282 }
283 case tui.KeyPageUp:
284 d.cursor -= page
285 if d.cursor < 0 {
286 d.cursor = 0
287 }
288 case tui.KeyPageDown:
289 d.cursor += page
290 if d.cursor >= len(d.sessions) {
291 d.cursor = len(d.sessions) - 1
292 if d.cursor < 0 {
293 d.cursor = 0
294 }
295 }
296 case tui.KeyHome:
297 d.cursor = 0
298 case tui.KeyEnd:
299 if len(d.sessions) > 0 {
300 d.cursor = len(d.sessions) - 1
301 }
302 case tui.KeyEsc:
303 d.Close()
304 return sessionDialogAction{Close: true}
305 case tui.KeyEnter:
306 if len(d.sessions) == 0 {
307 d.Close()
308 return sessionDialogAction{Close: true}
309 }
310 s := d.sessions[d.cursor]
311 d.Close()
312 return sessionDialogAction{Select: true, Path: s.Path}
313 case tui.KeyRune:
314 if k.Rune == 'r' && len(d.sessions) > 0 {
315 s := d.sessions[d.cursor]
316 d.renaming = true
317 if s.Title != "" {
318 d.rename = s.Title
319 } else {
320 d.rename = ""
321 }
322 return sessionDialogAction{}
323 }
324 }
325 return sessionDialogAction{}
326}