initial commit

backend/app/services/instruction_service.py

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+"""FluentGerman.ai — Instruction assembly service."""
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models import Instruction, InstructionType
+
+
+async def get_system_prompt(db: AsyncSession, user_id: int) -> str:
+    """Assemble the full system prompt from global + personal + homework instructions."""
+
+    # Global instructions (no user_id)
+    result = await db.execute(
+        select(Instruction).where(
+            Instruction.user_id.is_(None),
+            Instruction.type == InstructionType.GLOBAL,
+        )
+    )
+    global_instructions = result.scalars().all()
+
+    # Personal + homework for this user
+    result = await db.execute(
+        select(Instruction).where(Instruction.user_id == user_id)
+    )
+    user_instructions = result.scalars().all()
+
+    parts: list[str] = []
+
+    if global_instructions:
+        parts.append("=== TEACHING METHOD ===")
+        for inst in global_instructions:
+            parts.append(f"[{inst.title}]\n{inst.content}")
+
+    personal = [i for i in user_instructions if i.type == InstructionType.PERSONAL]
+    if personal:
+        parts.append("\n=== PERSONAL INSTRUCTIONS ===")
+        for inst in personal:
+            parts.append(f"[{inst.title}]\n{inst.content}")
+
+    homework = [i for i in user_instructions if i.type == InstructionType.HOMEWORK]
+    if homework:
+        parts.append("\n=== CURRENT HOMEWORK ===")
+        for inst in homework:
+            parts.append(f"[{inst.title}]\n{inst.content}")
+
+    if not parts:
+        return (
+            "You are a helpful German language tutor. Help the student learn German "
+            "through conversation, corrections, and explanations."
+        )
+
+    return "\n\n".join(parts)