feat: sync AI compose and ChatBot features

internal/app/ai/local.go

@@ -0,0 +1,85 @@
+package ai
+
+import (
+	"context"
+	"strings"
+
+	"telesrv/internal/domain"
+)
+
+// LocalProvider 是默认开发 provider：不出网、不记录内容，做确定性轻量整理。
+type LocalProvider struct{}
+
+func (LocalProvider) Name() string { return "local" }
+
+func (LocalProvider) Compose(_ context.Context, req ProviderRequest) (domain.AIComposeText, error) {
+	if req.Purpose == ProviderPurposeTextGeneration {
+		return domain.AIComposeText{}, domain.ErrAIComposeProviderUnavailable
+	}
+	text := localTransform(req.Request.Text.Text, req.Request, req.Tone)
+	return domain.AIComposeText{Text: text}, nil
+}
+
+func localTransform(text string, req domain.AIComposeRequest, tone domain.AIComposeTone) string {
+	text = strings.TrimSpace(collapseWhitespace(text))
+	if text == "" {
+		return text
+	}
+	if req.TranslateToLang != "" {
+		return text
+	}
+	switch tone.Slug {
+	case "formal":
+		return ensureSentencePunctuation(text)
+	case "friendly":
+		return ensureSentencePunctuation(text)
+	case "concise":
+		return trimVerboseLead(text)
+	default:
+		return ensureSentencePunctuation(text)
+	}
+}
+
+func collapseWhitespace(s string) string {
+	lines := strings.Split(s, "\n")
+	for i := range lines {
+		lines[i] = strings.Join(strings.Fields(lines[i]), " ")
+	}
+	out := make([]string, 0, len(lines))
+	for _, line := range lines {
+		if line != "" {
+			out = append(out, line)
+		}
+	}
+	return strings.Join(out, "\n")
+}
+
+func ensureSentencePunctuation(s string) string {
+	if s == "" {
+		return s
+	}
+	var last rune
+	for _, r := range s {
+		last = r
+	}
+	switch last {
+	case '.', '!', '?', ':', ';', '。', '！', '？':
+		return s
+	default:
+		return s + "."
+	}
+}
+
+func trimVerboseLead(s string) string {
+	prefixes := []string{
+		"I just wanted to ",
+		"I wanted to ",
+		"Just wanted to ",
+	}
+	for _, p := range prefixes {
+		if strings.HasPrefix(s, p) {
+			return ensureSentencePunctuation(strings.TrimPrefix(s, p))
+		}
+	}
+	return ensureSentencePunctuation(s)
+}