125 lines
3.8 KiB
Go
125 lines
3.8 KiB
Go
package main
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import (
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"context"
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"fmt"
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"google.golang.org/genai"
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)
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type chatTurn struct {
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Role string `json:"role"` // "user" or "model"
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Text string `json:"text"`
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}
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const (
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modelGemma = "gemma-4-26b-a4b-it"
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modelGemini = "gemini-flash-latest"
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searchFuncName = "search_youtube"
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)
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func selectModel(unlockCode, unlockSecret string) string {
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if unlockSecret != "" && unlockCode == unlockSecret {
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return modelGemini
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}
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return modelGemma
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}
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var personaTones = map[string]string{
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"energetic": "テンション高めで元気いっぱい、リアクションが大きい性格。",
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"downer": "気だるげでローテンション、淡々としているが憎めない性格。",
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"goofy": "ひょうきんでボケ気味、ちょっとふざけたことを言う性格。",
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"neutral": "落ち着いていて素直な性格。",
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}
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func buildSystemInstruction(videoTitle, videoDescription, persona string) *genai.Content {
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tone, ok := personaTones[persona]
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if !ok {
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tone = personaTones["neutral"]
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}
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prompt := fmt.Sprintf(
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"あなたはユーザーと一緒に動画を見ている友達です。タメ口で短く、実況や相槌のように反応してください。\n"+
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"性格: %s\n"+
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"今見ている動画:\nタイトル: %s\n概要: %s\n"+
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"ユーザーが「次の動画」「こういうの見たい」「〇〇のやつ見せて」のように次に見る動画を探してほしそうな時は"+
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"%s関数でYouTubeを検索し、見つかったものから軽くおすすめして。",
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tone, videoTitle, videoDescription, searchFuncName,
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)
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return genai.NewContentFromText(prompt, genai.RoleUser)
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}
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func searchTool() *genai.Tool {
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return &genai.Tool{
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FunctionDeclarations: []*genai.FunctionDeclaration{
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{
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Name: searchFuncName,
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Description: "ユーザーが次に見たい動画・関連動画・代替の動画を探すためにYouTubeを検索する。",
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Parameters: &genai.Schema{
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Type: genai.TypeObject,
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Properties: map[string]*genai.Schema{
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"query": {Type: genai.TypeString, Description: "YouTube検索キーワード"},
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},
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Required: []string{"query"},
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},
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},
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},
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}
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}
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type chatOutcome struct {
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Reply string
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Videos []searchResult
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Model string
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}
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func chatReply(ctx context.Context, client *genai.Client, model, ytAPIKey, videoTitle, videoDescription, persona string, history []chatTurn, message string) (*chatOutcome, error) {
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contents := make([]*genai.Content, 0, len(history)+1)
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for _, h := range history {
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contents = append(contents, genai.NewContentFromText(h.Text, genai.Role(h.Role)))
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}
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contents = append(contents, genai.NewContentFromText(message, genai.RoleUser))
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config := &genai.GenerateContentConfig{
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SystemInstruction: buildSystemInstruction(videoTitle, videoDescription, persona),
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Tools: []*genai.Tool{searchTool()},
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}
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resp, err := client.Models.GenerateContent(ctx, model, contents, config)
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if err != nil {
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return nil, err
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}
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calls := resp.FunctionCalls()
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if len(calls) == 0 {
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return &chatOutcome{Reply: resp.Text(), Model: model}, nil
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}
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call := calls[0]
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query, _ := call.Args["query"].(string)
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results, err := searchVideos(query, ytAPIKey)
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if err != nil {
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results = nil
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}
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items := make([]map[string]any, len(results))
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for i, r := range results {
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items[i] = map[string]any{
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"videoId": r.VideoID,
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"title": r.Title,
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"channelTitle": r.ChannelTitle,
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}
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}
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if len(resp.Candidates) > 0 {
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contents = append(contents, resp.Candidates[0].Content)
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}
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contents = append(contents, genai.NewContentFromFunctionResponse(call.Name, map[string]any{"results": items}, genai.RoleUser))
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resp2, err := client.Models.GenerateContent(ctx, model, contents, config)
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if err != nil {
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return nil, err
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}
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return &chatOutcome{Reply: resp2.Text(), Videos: results, Model: model}, nil
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}
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