use rusqlite::{Connection, params};
use serde::Serialize;
use crate::errors::AppError;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum QueryState {
All,
Pending,
Enriched,
}
#[derive(Debug, Clone, Serialize)]
pub struct AddedItem {
pub item_id: i64,
pub created_at: String,
pub source: String,
pub text: String,
}
#[derive(Debug, Clone, Serialize)]
pub struct ListItem {
pub item_id: i64,
pub created_at: String,
pub state: String,
pub text_preview: String,
pub content_type: Option<String>,
pub validation_status: Option<String>,
}
#[derive(Debug, Clone, Serialize)]
pub struct FetchItem {
pub item_id: i64,
pub created_at: String,
pub source: String,
pub text: String,
pub state: String,
pub content_type: Option<String>,
pub validation_status: Option<String>,
}
#[derive(Debug, Clone)]
pub struct FetchCursor {
pub item_id: i64,
pub created_at: String,
}
pub fn add_item(
conn: &Connection,
text: &str,
source: &str,
created_at: Option<&str>,
) -> Result<AddedItem, AppError> {
if let Some(created_at) = created_at {
conn.execute(
"insert into inbox_items(source, raw_text, created_at) values(?1, ?2, ?3)",
params![source, text, created_at],
)
.map_err(AppError::db_write)?;
} else {
conn.execute(
"insert into inbox_items(source, raw_text) values(?1, ?2)",
params![source, text],
)
.map_err(AppError::db_write)?;
}
let item_id = conn.last_insert_rowid();
let created_at: String = conn
.query_row(
"select created_at from inbox_items where item_id = ?1",
params![item_id],
|row| row.get(0),
)
.map_err(AppError::db_query)?;
Ok(AddedItem {
item_id,
created_at,
source: source.to_string(),
text: text.to_string(),
})
}
pub fn list_items(
conn: &Connection,
state: QueryState,
limit: usize,
offset: usize,
) -> Result<Vec<ListItem>, AppError> {
let state_filter = state_sql(state);
let sql = format!(
"select
i.item_id,
i.created_at,
case
when ad.derivation_id is not null then 'enriched'
else 'pending'
end as state,
substr(i.raw_text, 1, 80) as text_preview,
json_extract(ad.payload_json, '$.content_type') as content_type,
json_extract(ad.payload_json, '$.validation_status') as validation_status
from inbox_items i
left join item_derivations ad
on ad.derivation_id = (
select d.derivation_id
from item_derivations d
where d.item_id = i.item_id
and d.is_active = 1
and d.status = 'accepted'
order by d.derivation_version desc, d.derivation_id desc
limit 1
)
where {state_filter}
order by i.created_at desc, i.item_id desc
limit ?1 offset ?2"
);
let mut stmt = conn.prepare(&sql).map_err(AppError::db_query)?;
let rows = stmt
.query_map(params![limit as i64, offset as i64], |row| {
Ok(ListItem {
item_id: row.get(0)?,
created_at: row.get(1)?,
state: row.get(2)?,
text_preview: row.get(3)?,
content_type: row.get(4)?,
validation_status: row.get(5)?,
})
})
.map_err(AppError::db_query)?;
rows.collect::<Result<Vec<_>, _>>()
.map_err(AppError::db_query)
}
pub fn lookup_fetch_cursor(
conn: &Connection,
item_id: i64,
) -> Result<Option<FetchCursor>, AppError> {
conn.query_row(
"select item_id, created_at from inbox_items where item_id = ?1",
params![item_id],
|row| {
Ok(FetchCursor {
item_id: row.get(0)?,
created_at: row.get(1)?,
})
},
)
.map(Some)
.or_else(|err| match err {
rusqlite::Error::QueryReturnedNoRows => Ok(None),
other => Err(AppError::db_query(other)),
})
}
pub fn fetch_pending_page(
conn: &Connection,
limit: usize,
cursor: Option<&FetchCursor>,
) -> Result<Vec<FetchItem>, AppError> {
let mut stmt = conn
.prepare(
"select i.item_id, i.created_at, i.source, i.raw_text
, null as content_type
, null as validation_status
from inbox_items i
where not exists (
select 1 from item_derivations d
where d.item_id = i.item_id and d.is_active = 1 and d.status = 'accepted'
)
and (
?1 is null
or i.created_at < ?2
or (i.created_at = ?2 and i.item_id < ?1)
)
order by i.created_at desc, i.item_id desc
limit ?3",
)
.map_err(AppError::db_query)?;
let cursor_item_id = cursor.map(|value| value.item_id);
let cursor_created_at = cursor.map(|value| value.created_at.as_str());
let rows = stmt
.query_map(
params![cursor_item_id, cursor_created_at, limit as i64],
|row| {
Ok(FetchItem {
item_id: row.get(0)?,
created_at: row.get(1)?,
source: row.get(2)?,
text: row.get(3)?,
state: "pending".to_string(),
content_type: row.get(4)?,
validation_status: row.get(5)?,
})
},
)
.map_err(AppError::db_query)?;
rows.collect::<Result<Vec<_>, _>>()
.map_err(AppError::db_query)
}
fn state_sql(state: QueryState) -> &'static str {
match state {
QueryState::All => "1 = 1",
QueryState::Pending => {
"not exists (
select 1 from item_derivations d
where d.item_id = i.item_id and d.is_active = 1 and d.status = 'accepted'
)"
}
QueryState::Enriched => {
"exists (
select 1 from item_derivations d
where d.item_id = i.item_id and d.is_active = 1 and d.status = 'accepted'
)"
}
}
}