use crate::core::db::schema;
use crate::core::db::PostgresDb;
use anyhow::Result;
use sqlx::PgPool;

pub struct TkgLogger {
    pool: PgPool,
    pub log_id: Option<i64>,
}

impl TkgLogger {
    pub fn new(pool: PgPool) -> Self {
        Self { pool, log_id: None }
    }

    pub async fn start_operation(pool: &PgPool, file_uuid: &str, operation: &str) -> Result<i64> {
        let table = schema::table_name("tkg_operation_log");
        let id = sqlx::query_scalar::<_, i64>(&format!(
            "INSERT INTO {table} (file_uuid, operation, status, started_at) \
             VALUES ($1, $2, 'pending', NOW()) RETURNING id"
        ))
        .bind(file_uuid)
        .bind(operation)
        .fetch_one(pool)
        .await?;
        tracing::info!("[TKG-Log] Started operation {} for {}", operation, file_uuid);
        Ok(id)
    }

    pub async fn update_progress(
        &self,
        node_type: &str,
        nodes_created: i32,
        edges_created: i32,
    ) -> Result<()> {
        if let Some(log_id) = self.log_id {
            let table = schema::table_name("tkg_operation_log");
            sqlx::query(&format!(
                "UPDATE {table} \
                 SET nodes_created = nodes_created + $1, \
                     edges_created = edges_created + $2, \
                     node_type = COALESCE(node_type, $3) \
                 WHERE id = $4"
            ))
            .bind(nodes_created)
            .bind(edges_created)
            .bind(node_type)
            .bind(log_id)
            .execute(&self.pool)
            .await?;
        }
        Ok(())
    }

    pub async fn complete_operation(&self, error: Option<&str>) -> Result<()> {
        if let Some(log_id) = self.log_id {
            let table = schema::table_name("tkg_operation_log");
            let status = if error.is_some() { "failed" } else { "completed" };
            sqlx::query(&format!(
                "UPDATE {table} \
                 SET status = $1, \
                     error_message = $2, \
                     completed_at = NOW() \
                 WHERE id = $3"
            ))
            .bind(status)
            .bind(error)
            .bind(log_id)
            .execute(&self.pool)
            .await?;
            tracing::info!("[TKG-Log] Operation {} completed with status: {}", log_id, status);
        }
        Ok(())
    }

    pub async fn get_operations(pool: &PgPool, file_uuid: &str) -> Result<Vec<crate::core::tkg::models::TkgOperationLog>> {
        let table = schema::table_name("tkg_operation_log");
        let rows = sqlx::query_as::<_, (i64, String, String, Option<String>, Option<String>, i32, i32, i32, i32, i32, i32, String, Option<String>, String, Option<String>, Option<serde_json::Value>)>(&format!(
            "SELECT id, file_uuid, operation, node_type, edge_type, \
                    nodes_created, nodes_updated, nodes_deleted, \
                    edges_created, edges_updated, edges_deleted, \
                    status, error_message, started_at::text, completed_at::text, properties \
             FROM {table} WHERE file_uuid = $1 ORDER BY started_at DESC"
        ))
        .bind(file_uuid)
        .fetch_all(pool)
        .await?;

        Ok(rows.into_iter().map(|r| crate::core::tkg::models::TkgOperationLog {
            id: r.0,
            file_uuid: r.1,
            operation: r.2,
            node_type: r.3,
            edge_type: r.4,
            nodes_created: r.5,
            nodes_updated: r.6,
            nodes_deleted: r.7,
            edges_created: r.8,
            edges_updated: r.9,
            edges_deleted: r.10,
            status: r.11,
            error_message: r.12,
            started_at: r.13,
            completed_at: r.14,
            properties: r.15,
        }).collect())
    }

    pub async fn delete_operations(pool: &PgPool, file_uuid: &str) -> Result<i64> {
        let table = schema::table_name("tkg_operation_log");
        let result = sqlx::query(&format!(
            "DELETE FROM {table} WHERE file_uuid = $1"
        ))
        .bind(file_uuid)
        .execute(pool)
        .await?;
        Ok(result.rows_affected() as i64)
    }
}