🎉 initial commit

src/main/aiService.ts

@@ -0,0 +1,101 @@
+import Anthropic from '@anthropic-ai/sdk'
+import type { AIPayload } from '../renderer/types/editor'
+
+let _client: Anthropic | null = null
+
+function getClient(): Anthropic {
+  if (!_client) {
+    const apiKey = process.env.ANTHROPIC_API_KEY
+if (!apiKey || apiKey === 'your-api-key-here') {
+      throw new Error(
+        'ANTHROPIC_API_KEY is not set. Add it to app/.env.local'
+      )
+    }
+    _client = new Anthropic({ apiKey })
+  }
+  return _client
+}
+
+function buildSystemPrompt(payload: AIPayload): string {
+  const chapterName =
+    payload.documentPath.split('/').pop()?.replace(/\.md$/, '') ?? 'Unknown chapter'
+
+  const chapterContext = `You are a literary editor assistant helping with a gothic/historical fiction novel set in the Basque Country. The current chapter is: "${chapterName}".
+
+Key characters: Esti, Marko, Garbi, Irati, Cardinal Nikolai, Amaya, Izotz, Sua, Señor Jiménez, the Genboa family.
+
+The chapter text is provided below. When identifying specific passages, quote the EXACT text from the document so it can be located and highlighted in the editor.
+
+--- CHAPTER ---
+${payload.documentContent}
+--- END CHAPTER ---`
+
+  const modeInstructions: Record<AIPayload['mode'], string> = {
+    chat: 'Answer questions about the chapter, characters, plot, or craft. Be specific and cite passages where relevant.',
+
+    passive_voice: `Identify ALL instances of passive voice in this chapter.
+
+For each instance, respond in this exact format:
+PASSIVE: "[exact quoted sentence]"
+WHY: [brief explanation]
+SUGGESTION: "[rewritten in active voice]"
+
+List every instance you find, then give a brief overall summary.`,
+
+    consistency: `Check this chapter carefully for consistency issues:
+- Character names spelled or used inconsistently
+- Timeline contradictions or impossibilities
+- Repeated words or phrases appearing too close together (within a page)
+- Setting details that seem contradictory
+- Character behaviour inconsistent with their established personality
+
+For each issue found:
+ISSUE: [type of issue]
+PASSAGE: "[exact quoted text]"
+PROBLEM: [explanation]
+SUGGESTION: [how to fix it]`,
+
+    style: `Analyze the writing style and provide specific improvement suggestions:
+- Pacing: identify slow passages or rushed moments
+- Sentence variety: flag runs of similar length or structure
+- Show don't tell: identify passages that tell emotion/state rather than showing it
+- Gothic atmosphere: passages where the atmospheric tone is inconsistent
+- Dialogue: any dialogue that feels stilted or unnatural
+
+For each suggestion:
+ISSUE: [type: Pacing / Sentence Variety / Show-Don't-Tell / Atmosphere / Dialogue]
+PASSAGE: "[exact quoted text]"
+PROBLEM: [specific explanation]
+SUGGESTION: [concrete rewrite or approach]`
+  }
+
+  return `${chapterContext}\n\n${modeInstructions[payload.mode]}`
+}
+
+export async function streamMessage(
+  payload: AIPayload,
+  onChunk: (chunk: string) => void
+): Promise<void> {
+  const client = getClient()
+
+  const messages = [
+    ...payload.conversationHistory.slice(-10),
+    { role: 'user' as const, content: payload.userMessage }
+  ]
+
+  const stream = client.messages.stream({
+    model: 'claude-sonnet-4-5',
+    max_tokens: 4096,
+    system: buildSystemPrompt(payload),
+    messages
+  })
+
+  for await (const chunk of stream) {
+    if (
+      chunk.type === 'content_block_delta' &&
+      chunk.delta.type === 'text_delta'
+    ) {
+      onChunk(chunk.delta.text)
+    }
+  }
+}