use qdrant_client::{
    Qdrant, 
    config::QdrantConfig,
    qdrant::{
        PointStruct, SearchPointsBuilder, UpsertPointsBuilder, CreateCollectionBuilder, Distance, VectorParamsBuilder,
    },
    Payload,
};
use serde::{Deserialize, Serialize};
use anyhow::Result;

#[derive(Debug, Serialize, Deserialize)]
pub struct StoryMetadata {
    pub story_id: String,
    pub title: String,
    pub tags: Vec<String>,
    pub category: String,
    pub last_updated: u64,
}

pub struct QdrantClientWrapper {
    client: Qdrant,
    collection_name: String,
}

impl QdrantClientWrapper {
    pub async fn new(url: &str, api_key: Option<String>, collection_name: String) -> Result<Self> {
        let mut config = QdrantConfig::from_url(url);
        if let Some(key) = api_key {
            config.api_key = Some(key);
        }
        
        let client = Qdrant::new(config)?;
        
        Ok(Self {
            client,
            collection_name,
        })
    }

    pub async fn search_similar(
        &self,
        vector: Vec<f32>,
        limit: u64,
        threshold: f32,
    ) -> Result<Vec<(StoryMetadata, f32)>> {
        let search_result = self.client.search_points(
            SearchPointsBuilder::new(self.collection_name.clone(), vector, limit)
                .score_threshold(threshold)
                .with_payload(true)
        ).await?;

        let mut results = Vec::new();
        for point in search_result.result {
            let metadata: StoryMetadata = serde_json::from_value(serde_json::to_value(point.payload)?)?;
            results.push((metadata, point.score));
        }

        Ok(results)
    }

    pub async fn upsert_story(
        &self,
        id: String,
        vector: Vec<f32>,
        metadata: StoryMetadata,
    ) -> Result<()> {
        let payload: Payload = serde_json::from_value(serde_json::to_value(metadata)?)?;
        
        let point = PointStruct::new(
            id,
            vector,
            payload,
        );

        self.client.upsert_points(
            UpsertPointsBuilder::new(self.collection_name.clone(), vec![point])
        ).await?;

        Ok(())
    }

    pub async fn collection_exists(&self) -> Result<bool> {
        match self.client.collection_info(self.collection_name.clone()).await {
            Ok(_) => Ok(true),
            Err(_) => Ok(false),
        }
    }

    pub async fn create_collection(&self, vector_size: u64) -> Result<()> {
        self.client.create_collection(
            CreateCollectionBuilder::new(self.collection_name.clone())
                .vectors_config(VectorParamsBuilder::new(vector_size, Distance::Cosine))
        ).await?;
        Ok(())
    }
}