"""
Prompts Service for Python/FastAPI
Port of lib/prompts-service.ts

Handles:
- Read/write prompts.json
- Sync prompts from crawlers (placeholder - crawlers complex to port)
"""
import json
import os
import asyncio
from pathlib import Path
from typing import List, Dict, Any, Optional
from datetime import datetime

# Path to prompts data file (relative to project root)
DATA_DIR = Path(__file__).parent.parent.parent / "data"
DATA_FILE = DATA_DIR / "prompts.json"


class Prompt:
    def __init__(self, data: Dict[str, Any]):
        self.id = data.get("id", 0)
        self.title = data.get("title", "")
        self.description = data.get("description", "")
        self.prompt = data.get("prompt", "")
        self.category = data.get("category", "")
        self.source = data.get("source", "")
        self.source_url = data.get("source_url", "")
        self.images = data.get("images", [])
        self.use_count = data.get("useCount", 0)
        self.last_used_at = data.get("lastUsedAt")
        self.created_at = data.get("createdAt")

    def to_dict(self) -> Dict[str, Any]:
        return {
            "id": self.id,
            "title": self.title,
            "description": self.description,
            "prompt": self.prompt,
            "category": self.category,
            "source": self.source,
            "source_url": self.source_url,
            "images": self.images,
            "useCount": self.use_count,
            "lastUsedAt": self.last_used_at,
            "createdAt": self.created_at
        }


class PromptCache:
    def __init__(self, data: Dict[str, Any]):
        self.prompts = [Prompt(p) for p in data.get("prompts", [])]
        self.last_updated = data.get("last_updated")
        self.last_sync = data.get("lastSync")
        self.categories = data.get("categories", {})
        self.total_count = data.get("total_count", 0)
        self.sources = data.get("sources", [])

    def to_dict(self) -> Dict[str, Any]:
        return {
            "prompts": [p.to_dict() for p in self.prompts],
            "last_updated": self.last_updated,
            "lastSync": self.last_sync,
            "categories": self.categories,
            "total_count": self.total_count,
            "sources": self.sources
        }


async def get_prompts() -> PromptCache:
    """Read prompts from JSON file"""
    try:
        if DATA_FILE.exists():
            content = DATA_FILE.read_text(encoding='utf-8')
            data = json.loads(content)
            return PromptCache(data)
    except Exception as e:
        print(f"[PromptsService] Error reading prompts: {e}")

    return PromptCache({
        "prompts": [],
        "last_updated": None,
        "categories": {},
        "total_count": 0,
        "sources": []
    })


async def save_prompts(cache: PromptCache) -> None:
    """Save prompts to JSON file"""
    try:
        DATA_DIR.mkdir(parents=True, exist_ok=True)
        content = json.dumps(cache.to_dict(), indent=2, ensure_ascii=False)
        DATA_FILE.write_text(content, encoding='utf-8')
    except Exception as e:
        print(f"[PromptsService] Error saving prompts: {e}")
        raise


async def sync_prompts() -> Dict[str, Any]:
    """
    Sync prompts from sources.
    Note: The crawler implementation is complex and would require porting
    the JavaScript crawlers. For now, this just refreshes the timestamp.
    """
    print("[PromptsService] Starting sync...")

    cache = await get_prompts()
    now = int(datetime.now().timestamp() * 1000)

    # Update sync timestamp
    cache.last_sync = now
    cache.last_updated = datetime.now().isoformat()

    await save_prompts(cache)

    return {
        "success": True,
        "count": len(cache.prompts),
        "added": 0
    }


async def track_prompt_use(prompt_id: int) -> Optional[Prompt]:
    """Track usage of a prompt"""
    cache = await get_prompts()

    for prompt in cache.prompts:
        if prompt.id == prompt_id:
            prompt.use_count += 1
            prompt.last_used_at = int(datetime.now().timestamp() * 1000)
            await save_prompts(cache)
            return prompt

    return None


async def upload_prompt_image(prompt_id: int, image_base64: str) -> Optional[Prompt]:
    """Upload an image for a prompt"""
    cache = await get_prompts()

    for prompt in cache.prompts:
        if prompt.id == prompt_id:
            if prompt.images is None:
                prompt.images = []
            prompt.images.append(f"data:image/png;base64,{image_base64}")
            await save_prompts(cache)
            return prompt

    return None