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use crate::indexer::TemplateManager;
use crate::latest_block_manager::LatestBlockManager;
use crate::process_logs::ExecutionMode;
use alloy::providers::Provider;
use alloy::providers::RootProvider;
use alloy::rpc::types::eth::Block;
use alloy::rpc::types::eth::BlockNumberOrTag;
use alloy::transports::http::{Client, Http};
use async_trait::async_trait;
use std::sync::Arc;

pub struct BlockContext {
    pub provider: RootProvider<Http<Client>>,
    pub templates: TemplateManager,
    pub block: Block,
}

pub type BlockHandlerInstance = Arc<Box<(dyn BlockHandler + Send + Sync)>>;

#[async_trait]
pub trait BlockHandler {
    async fn handle(&self, params: BlockContext);
    fn get_source(&self) -> String;
}

pub struct BlockConfig {
    pub start_block: u64,
    pub handler: BlockHandlerInstance,
    pub provider: RootProvider<Http<Client>>,
    pub templates: TemplateManager,
    pub step: u64,
    pub execution_mode: ExecutionMode,
}

pub async fn process_logs_block(
    BlockConfig {
        start_block,
        handler,
        provider,
        templates,
        step,
        execution_mode,
    }: BlockConfig,
) {
    let mut current_block = start_block;
    let mut latest_block_manager = LatestBlockManager::new(1000, provider.clone());

    loop {
        let latest_block = latest_block_manager.get().await;

        if current_block >= latest_block {
            tokio::time::sleep(tokio::time::Duration::from_secs(5)).await;
            continue;
        }

        let block = provider
            .get_block_by_number(BlockNumberOrTag::Number(current_block), false)
            .await
            .unwrap()
            .unwrap();

        match execution_mode {
            ExecutionMode::Parallel => {
                let handler = handler.clone();
                let provider = provider.clone();
                let templates = templates.clone();

                tokio::spawn(async move {
                    handler
                        .handle(BlockContext {
                            provider,
                            templates,
                            block,
                        })
                        .await;
                });
            }
            ExecutionMode::Serial => {
                let templates = templates.clone();
                let provider = provider.clone();
                let templates = templates.clone();

                handler
                    .handle(BlockContext {
                        provider,
                        templates,
                        block,
                    })
                    .await;
            }
        }

        current_block = current_block + step;
    }
}