// 手写 Rust 重新实现 payload 编码、业务计算、行解码和事务边界；仅复用同一队列和数据库设施。
use dever_runtime::{
    job::{self, Claim, Execution, Failure as JobFailure},
    wire::serde::{Deserialize, Serialize},
};

const SCHEMA: &str = JOB_SCHEMA;
const TARGET: &str = "bench.queue.job.publish";

#[derive(Serialize)]
#[serde(crate = "dever_runtime::wire::serde")]
struct RustPayload {
    name: String,
    amount: i64,
}

impl<'input> Deserialize<'input> for RustPayload {
    fn deserialize<Decoder: dever_runtime::wire::serde::Deserializer<'input>>(
        decoder: Decoder,
    ) -> Result<Self, Decoder::Error> {
        #[derive(Deserialize)]
        #[serde(crate = "dever_runtime::wire::serde", deny_unknown_fields)]
        struct Fields {
            name: String,
            amount: i64,
        }
        // 与 Dever record 一样只接受对象，不能用 serde 默认的数组兼容路径降低校验成本。
        let fields = dever_runtime::wire::object::<Fields, Decoder>(decoder)?;
        Ok(Self {
            name: fields.name,
            amount: fields.amount,
        })
    }
}

struct RustResult {
    _id: dever_runtime::database::Id<RESULT_MODEL>,
    _created_at: dever_runtime::time::calendar::DateTime,
    _name: String,
    amount: i64,
}

async fn rust_submit(
    name: &str,
    amount: i64,
    key: &str,
    scope: &Scope<'_>,
    database: &mut DbContext,
    execution: &Execution,
) -> Result<dever_runtime::value::id::Id, dever_runtime::database::Error> {
    let payload = dever_runtime::wire::json::Json::encode(&RustPayload {
        name: name.to_owned(),
        amount,
    })
    .map_err(|_| {
        dever_runtime::database::Error::new(
            dever_runtime::database::Kind::InvalidData,
            "invalid Job payload",
        )
    })?;
    let now = dever_runtime::database::now()?;
    let executor = database.on(JOB_BINDING, scope).await?;
    job::enqueue(
        executor,
        scope,
        job::Submission {
            target: TARGET,
            payload: Some(&payload),
            schema: SCHEMA,
            execution,
            key,
            policy: job::Policy {
                retries: 2,
                timeout_ms: 1000,
            },
            at: now,
        },
        now,
    )
    .await
}

async fn rust_apply(
    payload: RustPayload,
    scope: &Scope<'_>,
    database: &mut DbContext,
) -> Result<(), JobFailure> {
    let amount = payload
        .amount
        .checked_mul(3)
        .and_then(|value| value.checked_add(7))
        .ok_or(JobFailure::Handler)?;
    let parameters = vec![
        Parameter::Text(payload.name),
        Parameter::Integer(amount),
        Parameter::Integer(dever_runtime::database::now().map_err(|_| JobFailure::Handler)?),
    ];
    let executor = database
        .on(0, scope)
        .await
        .map_err(|_| JobFailure::Handler)?;
    let saved = executor.query(scope,
        "INSERT INTO \"bench_queue_model\" (\"name\",\"amount\",\"created_at\") VALUES (?1,?2,?3) RETURNING \"id\",\"created_at\",\"name\",\"amount\"",
        parameters, 1, |row| Ok(RustResult {
            _id: dever_runtime::database::Id(row.get(0)?),
            _created_at: dever_runtime::time::calendar::DateTime::from_millis(row.get::<_, i64>(1)?).map_err(|_| dever_runtime::database::Error::new(dever_runtime::database::Kind::InvalidData, "invalid stored DateTime"))?,
            _name: row.get(2)?, amount: row.get(3)?,
        })
    ).await.map_err(|_| JobFailure::Handler)?.pop().ok_or(JobFailure::Handler)?;
    if saved.amount < 0 {
        return Err(JobFailure::Handler);
    }
    Ok(())
}

async fn rust_execute(
    binding: usize,
    claim: Arc<Claim>,
    scope: Scope<'static>,
    registry: Arc<Registry>,
) -> Result<(), JobFailure> {
    let execution: Execution =
        dever_runtime::wire::decode(&claim.execution).map_err(|_| JobFailure::Blocked)?;
    if claim.target != TARGET || claim.schema != SCHEMA || !registry.same_pool(binding, JOB_BINDING)
    {
        return Err(JobFailure::Blocked);
    }
    if !matches!(execution, Execution::System { tenant: None }) || claim.execution_tenant != 0 {
        return Err(JobFailure::Blocked);
    }
    let payload: RustPayload =
        dever_runtime::wire::decode(&claim.payload).map_err(|_| JobFailure::Blocked)?;
    let mut database = DbContext::new(registry);
    let owner = database.enter();
    let outcome = async {
        rust_apply(payload, &scope, &mut database).await?;
        let executor = database
            .on(JOB_BINDING, &scope)
            .await
            .map_err(|_| JobFailure::Handler)?;
        job::complete(
            executor,
            &scope,
            &claim,
            dever_runtime::database::now().map_err(|_| JobFailure::Handler)?,
        )
        .await
        .map_err(|_| JobFailure::Handler)
    }
    .await;
    database
        .finish(&scope, owner, outcome.is_ok())
        .await
        .map_err(|_| JobFailure::Handler)?;
    outcome
}