grindlemire/go-tui code browser

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package formatter

import (
	"go/format"
	"strings"

	"github.com/grindlemire/go-tui/internal/tuigen"
)

// printForLoop outputs a for loop.
func (p *printer) printForLoop(f *tuigen.ForLoop) {
	// Leading comments
	p.printLeadingComments(f.LeadingComments)

	p.writeIndent()
	p.write("for ")

	// Loop variables
	if f.Index != "" {
		p.write(f.Index)
		p.write(", ")
	}
	p.write(f.Value)
	p.write(" := range ")
	p.write(f.Iterable)
	p.write(" {")
	p.printTrailingComment(f.TrailingComments)
	p.newline()

	// Body
	p.depth++
	p.printOrphanComments(f.OrphanComments)
	p.printBody(f.Body)
	p.depth--

	p.writeIndent()
	p.write("}")
	p.newline()
}

// printIfStmt outputs an if statement.
func (p *printer) printIfStmt(stmt *tuigen.IfStmt) {
	// Leading comments
	p.printLeadingComments(stmt.LeadingComments)

	p.writeIndent()
	p.write("if ")
	p.write(stmt.Condition)
	p.write(" {")
	p.printTrailingComment(stmt.TrailingComments)
	p.newline()

	// Then branch
	p.depth++
	p.printOrphanComments(stmt.OrphanComments)
	p.printBody(stmt.Then)
	p.depth--

	// Else branch
	if len(stmt.Else) > 0 {
		p.writeIndent()
		p.write("} else ")

		// Check for else-if chain
		if len(stmt.Else) == 1 {
			if elseIf, ok := stmt.Else[0].(*tuigen.IfStmt); ok {
				// Print else-if without extra indent
				p.write("if ")
				p.write(elseIf.Condition)
				p.write(" {")
				p.printTrailingComment(elseIf.TrailingComments)
				p.newline()

				p.depth++
				p.printOrphanComments(elseIf.OrphanComments)
				p.printBody(elseIf.Then)
				p.depth--

				if len(elseIf.Else) > 0 {
					p.printElseBranch(elseIf.Else)
				} else {
					p.writeIndent()
					p.write("}")
					p.newline()
				}
				return
			}
		}

		// Regular else
		p.write("{")
		p.newline()
		p.depth++
		p.printBody(stmt.Else)
		p.depth--
		p.writeIndent()
		p.write("}")
		p.newline()
	} else {
		p.writeIndent()
		p.write("}")
		p.newline()
	}
}

// printElseBranch handles recursive else-if chains.
func (p *printer) printElseBranch(nodes []tuigen.Node) {
	p.writeIndent()
	p.write("} else ")

	if len(nodes) == 1 {
		if elseIf, ok := nodes[0].(*tuigen.IfStmt); ok {
			p.write("if ")
			p.write(elseIf.Condition)
			p.write(" {")
			p.printTrailingComment(elseIf.TrailingComments)
			p.newline()

			p.depth++
			p.printOrphanComments(elseIf.OrphanComments)
			p.printBody(elseIf.Then)
			p.depth--

			if len(elseIf.Else) > 0 {
				p.printElseBranch(elseIf.Else)
			} else {
				p.writeIndent()
				p.write("}")
				p.newline()
			}
			return
		}
	}

	p.write("{")
	p.newline()
	p.depth++
	p.printBody(nodes)
	p.depth--
	p.writeIndent()
	p.write("}")
	p.newline()
}

// printLetBinding outputs a let binding using := syntax.
func (p *printer) printLetBinding(let *tuigen.LetBinding) {
	// Leading comments
	p.printLeadingComments(let.LeadingComments)

	p.writeIndent()

	// Always emit :=
	p.write(let.Name)
	p.write(" := ")

	if let.Call != nil {
		p.write("@")
		p.write(let.Call.Name)
		p.write("(")
		p.write(formatInlineBlockComments(let.Call.Args))
		p.write(")")
		p.newline()
		return
	}

	if let.Expr != "" && let.Element == nil {
		p.write("@")
		p.write(let.Expr)
		p.newline()
		return
	}

	// Element RHS - print inline or multi-line
	savedDepth := p.depth
	p.depth = 0

	p.buf.WriteString("<")
	p.buf.WriteString(let.Element.Tag)

	// Emit ref={expr} if present (extracted from attributes during parsing)
	if let.Element.RefExpr != nil {
		p.buf.WriteString(" ref={")
		p.buf.WriteString(let.Element.RefExpr.Code)
		p.buf.WriteString("}")
	}

	for _, attr := range let.Element.Attributes {
		p.buf.WriteString(" ")
		p.printAttribute(attr)
	}

	if let.Element.SelfClose {
		p.buf.WriteString(" />")
		p.newline()
		p.depth = savedDepth
		return
	}

	p.buf.WriteString(">")

	// Check if children should be rendered inline (preserving user's source layout)
	if let.Element.InlineChildren && p.canStructurallyInline(let.Element.Children) {
		p.printChildrenInline(let.Element.Children)
		p.buf.WriteString("</")
		p.buf.WriteString(let.Element.Tag)
		p.buf.WriteString(">")
		p.newline()
		p.depth = savedDepth
		return
	}

	// Multi-line children
	p.newline()
	p.depth = savedDepth + 1
	p.printBody(let.Element.Children)
	p.depth = savedDepth
	p.writeIndent()
	p.buf.WriteString("</")
	p.buf.WriteString(let.Element.Tag)
	p.buf.WriteString(">")
	p.newline()
}

// printComponentCall outputs a component call.
func (p *printer) printComponentCall(call *tuigen.ComponentCall) {
	// Leading comments
	p.printLeadingComments(call.LeadingComments)

	p.writeIndent()
	p.write("@")
	p.write(call.Name)
	p.write("(")

	if call.MultiLineArgs {
		args := splitTopLevelArgs(call.Args)
		p.newline()
		p.depth++
		for i, arg := range args {
			p.writeIndent()
			p.write(arg)
			p.write(",")
			if i < len(args)-1 {
				p.newline()
			}
		}
		p.depth--
		p.newline()
		p.writeIndent()
	} else {
		p.write(formatInlineBlockComments(call.Args))
	}

	p.write(")")

	if len(call.Children) > 0 {
		p.write(" {")
		p.printTrailingComment(call.TrailingComments)
		p.newline()

		p.depth++
		p.printBody(call.Children)
		p.depth--

		p.writeIndent()
		p.write("}")
	} else {
		p.printTrailingComment(call.TrailingComments)
	}
	p.newline()
}

// splitTopLevelArgs splits a Go argument string by top-level commas,
// respecting nested parentheses, brackets, braces, and string literals.
func splitTopLevelArgs(args string) []string {
	var result []string
	depth := 0
	inString := false
	inRune := false
	inBacktick := false
	start := 0

	for i := 0; i < len(args); i++ {
		ch := args[i]
		switch {
		case inBacktick:
			if ch == '`' {
				inBacktick = false
			}
		case inString:
			switch ch {
			case '\\':
				i++ // skip escaped char
			case '"':
				inString = false
			}
		case inRune:
			switch ch {
			case '\\':
				i++
			case '\'':
				inRune = false
			}
		default:
			switch ch {
			case '"':
				inString = true
			case '\'':
				inRune = true
			case '`':
				inBacktick = true
			case '(', '[', '{':
				depth++
			case ')', ']', '}':
				depth--
			case ',':
				if depth == 0 {
					arg := strings.TrimSpace(args[start:i])
					if arg != "" {
						result = append(result, arg)
					}
					start = i + 1
				}
			}
		}
	}

	// Last argument (may have trailing comma already trimmed by parser)
	last := strings.TrimSpace(args[start:])
	if last != "" {
		result = append(result, last)
	}

	return result
}

// formatGoCode runs gofmt on a top-level Go declaration or function.
func formatGoCode(code string) string {
	wrapped := "package p\n\n" + code + "\n"
	formatted, err := format.Source([]byte(wrapped))
	if err != nil {
		return code
	}
	result := string(formatted)
	result = strings.TrimPrefix(result, "package p\n\n")
	result = strings.TrimSuffix(result, "\n")
	return result
}

// printGoFunc outputs a top-level Go function.
func (p *printer) printGoFunc(fn *tuigen.GoFunc) {
	p.printLeadingComments(fn.LeadingComments)
	p.write(formatGoCode(fn.Code))
	p.printTrailingComment(fn.TrailingComments)
	p.newline()
}

// printGoDecl outputs a top-level Go declaration (type, const, var).
func (p *printer) printGoDecl(decl *tuigen.GoDecl) {
	p.printLeadingComments(decl.LeadingComments)
	p.write(formatGoCode(decl.Code))
	p.printTrailingComment(decl.TrailingComments)
	p.newline()
}