grindlemire/go-tui code browser

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486

// Package provider contains LSP feature implementations organized by capability.
package provider

import (
	"fmt"
	"strings"

	"github.com/grindlemire/go-tui/internal/lsp/gopls"
	"github.com/grindlemire/go-tui/internal/lsp/log"
	"github.com/grindlemire/go-tui/internal/lsp/schema"
	"github.com/grindlemire/go-tui/internal/tuigen"
)

// hoverProvider implements HoverProvider.
type hoverProvider struct {
	index        ComponentIndex
	goplsProxy   GoplsProxyAccessor
	virtualFiles VirtualFileAccessor
}

// NewHoverProvider creates a new hover provider.
func NewHoverProvider(index ComponentIndex, proxy GoplsProxyAccessor, vf VirtualFileAccessor) HoverProvider {
	return &hoverProvider{
		index:        index,
		goplsProxy:   proxy,
		virtualFiles: vf,
	}
}

func (h *hoverProvider) Hover(ctx *CursorContext) (*Hover, error) {
	log.Server("Hover provider: NodeKind=%s, Word=%q, InGoExpr=%v, InClassAttr=%v",
		ctx.NodeKind, ctx.Word, ctx.InGoExpr, ctx.InClassAttr)

	// For Go expressions, try gopls first
	if ctx.InGoExpr {
		hover, err := h.getGoplsHover(ctx)
		if err != nil {
			log.Server("gopls hover error: %v", err)
		} else if hover != nil {
			return hover, nil
		}
	}

	// Dispatch based on node kind
	switch ctx.NodeKind {
	case NodeKindComponent:
		// Try gopls for types in component parameter signatures
		hover, err := h.getGoplsHover(ctx)
		if err == nil && hover != nil {
			return hover, nil
		}
		return h.hoverComponent(ctx)
	case NodeKindElement:
		return h.hoverElement(ctx)
	case NodeKindAttribute:
		return h.hoverAttribute(ctx)
	case NodeKindEventHandler:
		return h.hoverEventHandler(ctx)
	case NodeKindParameter:
		return h.hoverParameter(ctx)
	case NodeKindKeyword:
		return h.hoverKeyword(ctx)
	case NodeKindForLoop:
		return h.hoverKeyword(ctx)
	case NodeKindIfStmt:
		return h.hoverKeyword(ctx)
	case NodeKindLetBinding:
		return h.hoverKeyword(ctx)
	case NodeKindFunction:
		// Try gopls for types in function signatures (e.g., *tui.State[int])
		hover, err := h.getGoplsHover(ctx)
		if err == nil && hover != nil {
			return hover, nil
		}
		return h.hoverFunction(ctx)
	case NodeKindComponentCall:
		return h.hoverComponentCall(ctx)
	case NodeKindRefAttr:
		return h.hoverRefAttr(ctx)
	case NodeKindStateDecl:
		return h.hoverStateDecl(ctx)
	case NodeKindStateAccess:
		return h.hoverStateAccess(ctx)
	case NodeKindTailwindClass:
		return h.hoverTailwindClass(ctx)
	case NodeKindGoExpr:
		// Already tried gopls above; fall through to word-based checks
	}

	// Word-based fallbacks
	word := ctx.Word
	if word == "" {
		return nil, nil
	}

	// Check if word is a keyword
	if hover := h.hoverForKeyword(word); hover != nil {
		return hover, nil
	}

	// Check if word is a component call (@Name or Name)
	componentName := strings.TrimPrefix(word, "@")
	if info, ok := h.index.Lookup(componentName); ok {
		return hoverForComponentInfo(info), nil
	}

	// Check if word is a function
	if funcInfo, ok := h.index.LookupFunc(word); ok {
		return hoverForFuncInfo(funcInfo), nil
	}

	// Check if word is a parameter in the current component
	if ctx.Scope.Component != nil {
		if paramInfo, ok := h.index.LookupParam(ctx.Scope.Component.Name, word); ok {
			return hoverForParamInfo(paramInfo), nil
		}
	}

	// Check if word is an element tag
	if elem := schema.GetElement(word); elem != nil {
		return hoverForElement(elem), nil
	}

	// Check for tailwind class (when InClassAttr but no AST resolution)
	if ctx.InClassAttr {
		return h.hoverForTailwindWord(ctx)
	}

	// Check for attribute (when AST didn't resolve but we're in an element)
	if ctx.InElement && ctx.AttrTag != "" {
		if attr := schema.GetAttribute(ctx.AttrTag, word); attr != nil {
			return hoverForAttributeDef(ctx.AttrTag, attr), nil
		}
	}

	return nil, nil
}

// --- Node-kind-specific hover functions ---

func (h *hoverProvider) hoverComponent(ctx *CursorContext) (*Hover, error) {
	comp, ok := ctx.Node.(*tuigen.Component)
	if !ok || comp == nil {
		return nil, nil
	}

	if info, ok := h.index.Lookup(comp.Name); ok {
		return hoverForComponentInfo(info), nil
	}

	// Fallback: build from AST directly
	var params []string
	for _, p := range comp.Params {
		params = append(params, fmt.Sprintf("%s %s", p.Name, p.Type))
	}
	sig := fmt.Sprintf("func %s(%s) *element.Element", comp.Name, strings.Join(params, ", "))
	md := fmt.Sprintf("```go\n%s\n```\n\n**TUI Component**", sig)
	return markdownHover(md), nil
}

func (h *hoverProvider) hoverElement(ctx *CursorContext) (*Hover, error) {
	elem, ok := ctx.Node.(*tuigen.Element)
	if !ok || elem == nil {
		return nil, nil
	}

	def := schema.GetElement(elem.Tag)
	if def == nil {
		return nil, nil
	}
	return hoverForElement(def), nil
}

func (h *hoverProvider) hoverAttribute(ctx *CursorContext) (*Hover, error) {
	if ctx.AttrTag == "" || ctx.AttrName == "" {
		return nil, nil
	}

	attr := schema.GetAttribute(ctx.AttrTag, ctx.AttrName)
	if attr != nil {
		return hoverForAttributeDef(ctx.AttrTag, attr), nil
	}

	// Fallback for unknown attributes
	return markdownHover(fmt.Sprintf("**%s** attribute on `<%s>`", ctx.AttrName, ctx.AttrTag)), nil
}

func (h *hoverProvider) hoverEventHandler(ctx *CursorContext) (*Hover, error) {
	handler := schema.GetEventHandler(ctx.AttrName)
	if handler != nil {
		md := fmt.Sprintf("**Event Handler** `%s`\n\nType: `%s`\n\n%s",
			handler.Name, handler.Signature, handler.Description)
		return markdownHover(md), nil
	}
	return nil, nil
}

func (h *hoverProvider) hoverParameter(ctx *CursorContext) (*Hover, error) {
	param, ok := ctx.Node.(*tuigen.Param)
	if !ok || param == nil {
		return nil, nil
	}

	compName := ""
	if ctx.Scope.Component != nil {
		compName = ctx.Scope.Component.Name
	}

	md := fmt.Sprintf("```go\n%s %s\n```\n\n**Parameter** of component `%s`",
		param.Name, param.Type, compName)
	return markdownHover(md), nil
}

func (h *hoverProvider) hoverKeyword(ctx *CursorContext) (*Hover, error) {
	return h.hoverForKeyword(ctx.Word), nil
}

func (h *hoverProvider) hoverFunction(ctx *CursorContext) (*Hover, error) {
	fn, ok := ctx.Node.(*tuigen.GoFunc)
	if !ok || fn == nil {
		return nil, nil
	}

	word := ctx.Word
	if funcInfo, ok := h.index.LookupFunc(word); ok {
		return hoverForFuncInfo(funcInfo), nil
	}
	return nil, nil
}

func (h *hoverProvider) hoverComponentCall(ctx *CursorContext) (*Hover, error) {
	call, ok := ctx.Node.(*tuigen.ComponentCall)
	if !ok || call == nil {
		return nil, nil
	}

	if info, ok := h.index.Lookup(call.Name); ok {
		return hoverForComponentInfo(info), nil
	}
	return nil, nil
}

func (h *hoverProvider) hoverRefAttr(ctx *CursorContext) (*Hover, error) {
	elem, ok := ctx.Node.(*tuigen.Element)
	if !ok || elem == nil || elem.RefExpr == nil {
		return nil, nil
	}

	refName := elem.RefExpr.Code
	// Capitalize first letter for export name
	exportName := refName
	if len(refName) > 0 {
		exportName = strings.ToUpper(refName[:1]) + refName[1:]
	}

	refType := "`*tui.Element`"
	refContext := "Simple (direct access)"
	accessPattern := fmt.Sprintf("`view.%s`", exportName)

	// Check scope for richer context
	for _, ref := range ctx.Scope.Refs {
		if ref.Name == refName {
			if ref.InLoop {
				if ref.KeyExpr != "" {
					refType = "`map[KeyType]*tui.Element`"
					refContext = "Keyed (map access)"
					accessPattern = fmt.Sprintf("`view.%s[key]`", exportName)
				} else {
					refType = "`[]*tui.Element`"
					refContext = "Loop (slice access)"
					accessPattern = fmt.Sprintf("`view.%s[i]`", exportName)
				}
			}
			if ref.InConditional {
				refContext += " (nullable)"
			}
			break
		}
	}

	md := fmt.Sprintf("**Element Ref** `%s`\n\nType: %s\n\nContext: %s\n\nAccess via view struct: %s",
		refName, refType, refContext, accessPattern)
	return markdownHover(md), nil
}

func (h *hoverProvider) hoverStateDecl(ctx *CursorContext) (*Hover, error) {
	// Try to find the state variable info from scope, matching by name
	for _, sv := range ctx.Scope.StateVars {
		if sv.Name == ctx.Word {
			md := fmt.Sprintf("**State Variable** `%s`\n\nType: `*tui.State[%s]`\n\nInitial: `%s`\n\nMethods: Get(), Set(), Update(), Bind(), Batch()",
				sv.Name, sv.Type, sv.InitExpr)
			return markdownHover(md), nil
		}
	}

	md := "**State Declaration** (`tui.NewState`)\n\nCreates a reactive state variable."
	return markdownHover(md), nil
}

func (h *hoverProvider) hoverStateAccess(ctx *CursorContext) (*Hover, error) {
	word := ctx.Word
	if strings.HasSuffix(word, "Get") || word == "Get" {
		return markdownHover("**State.Get()** — Returns the current value of the state variable."), nil
	}
	if strings.HasSuffix(word, "Set") || word == "Set" {
		return markdownHover("**State.Set(value)** — Sets a new value for the state variable."), nil
	}
	if strings.HasSuffix(word, "Update") || word == "Update" {
		return markdownHover("**State.Update(fn)** — Updates the state using a function that receives the current value."), nil
	}
	if strings.HasSuffix(word, "Bind") || word == "Bind" {
		return markdownHover("**State.Bind(fn)** — Registers a callback that is called when the state changes."), nil
	}
	if strings.HasSuffix(word, "Batch") || word == "Batch" {
		return markdownHover("**State.Batch(fn)** — Batches multiple state updates into a single re-render."), nil
	}
	return markdownHover("**State Access** — Reactive state method call."), nil
}

func (h *hoverProvider) hoverTailwindClass(ctx *CursorContext) (*Hover, error) {
	return h.hoverForTailwindWord(ctx)
}

// hoverForTailwindWord extracts the class name at the cursor and returns hover docs.
func (h *hoverProvider) hoverForTailwindWord(ctx *CursorContext) (*Hover, error) {
	offset := ctx.Offset
	content := ctx.Document.Content

	// Search backwards for class="
	searchStart := max(offset-maxClassAttrSearchDistance, 0)

	segment := content[searchStart:offset]
	classIdx := strings.LastIndex(segment, `class="`)
	if classIdx == -1 {
		return nil, nil
	}

	// Check we haven't passed the closing quote
	afterClass := segment[classIdx+7:]
	if strings.Contains(afterClass, `"`) {
		return nil, nil
	}

	// Find the class name at cursor
	classStart := searchStart + classIdx + 7
	classContent := content[classStart:offset]

	lastSpace := strings.LastIndex(classContent, " ")
	var className string
	if lastSpace == -1 {
		className = classContent
	} else {
		className = classContent[lastSpace+1:]
	}

	// Extend forward for full class name
	endOffset := offset
	for endOffset < len(content) && content[endOffset] != ' ' && content[endOffset] != '"' {
		endOffset++
	}
	if endOffset > offset {
		className += content[offset:endOffset]
	}

	className = strings.TrimSpace(className)
	if className == "" {
		return nil, nil
	}

	doc := schema.GetClassDoc(className)
	if doc == "" {
		return nil, nil
	}

	return markdownHover(fmt.Sprintf("**`%s`**\n\n%s", className, doc)), nil
}

// hoverForKeyword returns hover for a keyword word.
func (h *hoverProvider) hoverForKeyword(word string) *Hover {
	kw := schema.GetKeyword(word)
	if kw == nil {
		return nil
	}
	return markdownHover(kw.Documentation)
}

// --- Hover formatting helpers ---

func hoverForComponentInfo(info *ComponentInfo) *Hover {
	var params []string
	for _, p := range info.Params {
		params = append(params, fmt.Sprintf("%s %s", p.Name, p.Type))
	}
	sig := fmt.Sprintf("func %s(%s) *element.Element", info.Name, strings.Join(params, ", "))
	md := fmt.Sprintf("```go\n%s\n```\n\n**TUI Component**", sig)
	return markdownHover(md)
}

func hoverForFuncInfo(info *FuncInfo) *Hover {
	md := fmt.Sprintf("```go\n%s\n```\n\n**Helper Function**", info.Signature)
	return markdownHover(md)
}

func hoverForParamInfo(info *ParamInfo) *Hover {
	md := fmt.Sprintf("```go\n%s %s\n```\n\n**Parameter** of component `%s`",
		info.Name, info.Type, info.ComponentName)
	return markdownHover(md)
}

func hoverForElement(def *schema.ElementDef) *Hover {
	var lines []string
	lines = append(lines, fmt.Sprintf("## `<%s>`", def.Tag))
	lines = append(lines, "")
	lines = append(lines, def.Description)
	lines = append(lines, "")
	lines = append(lines, "**Available attributes:**")
	for _, attr := range def.Attributes {
		lines = append(lines, fmt.Sprintf("- `%s` (%s): %s", attr.Name, attr.Type, attr.Description))
	}
	return markdownHover(strings.Join(lines, "\n"))
}

func hoverForAttributeDef(tag string, attr *schema.AttributeDef) *Hover {
	md := fmt.Sprintf("**%s** (`%s`) on `<%s>`\n\n%s", attr.Name, attr.Type, tag, attr.Description)
	return markdownHover(md)
}

func markdownHover(content string) *Hover {
	return &Hover{
		Contents: MarkupContent{
			Kind:  "markdown",
			Value: content,
		},
	}
}

// --- gopls hover delegation ---

func (h *hoverProvider) getGoplsHover(ctx *CursorContext) (*Hover, error) {
	proxy := h.goplsProxy.GetProxy()
	if proxy == nil {
		return nil, nil
	}

	cached := h.virtualFiles.GetVirtualFile(ctx.Document.URI)
	if cached == nil || cached.SourceMap == nil {
		return nil, nil
	}

	goLine, goCol, found := cached.SourceMap.TuiToGo(ctx.Position.Line, ctx.Position.Character)
	if !found {
		return nil, nil
	}

	goplsHover, err := proxy.Hover(cached.GoURI, gopls.Position{
		Line:      goLine,
		Character: goCol,
	})
	if err != nil {
		return nil, err
	}

	if goplsHover == nil {
		return nil, nil
	}

	hover := &Hover{
		Contents: MarkupContent{
			Kind:  goplsHover.Contents.Kind,
			Value: goplsHover.Contents.Value,
		},
	}

	if goplsHover.Range != nil {
		tuiStartLine, tuiStartCol, startFound := cached.SourceMap.GoToTui(goplsHover.Range.Start.Line, goplsHover.Range.Start.Character)
		tuiEndLine, tuiEndCol, endFound := cached.SourceMap.GoToTui(goplsHover.Range.End.Line, goplsHover.Range.End.Character)
		if startFound && endFound {
			hover.Range = &Range{
				Start: Position{Line: tuiStartLine, Character: tuiStartCol},
				End:   Position{Line: tuiEndLine, Character: tuiEndCol},
			}
		}
	}

	return hover, nil
}