--liquibase formatted sql
--changeset agentneo:fn_GetAsset runOnChange:true stripComments:false endDelimiter:/
--comment: Create or replace xyz."fn_GetAsset"

------------------------------------------------------------------------------------
-- Created by:  AgentNeo
-- Created on:  09/07/2026
-- Description: Get a single asset by project and asset id (excludes soft-deleted).
--              Includes a scalar "SystemId" resolved from the asset's AssetType via
--              xyz."AssetTypeSystemTypeMapping" (NULL when no mapping exists). The
--              AssetType->SystemType relationship may be many, so the lookup picks a
--              single deterministic mapping (earliest created) to avoid fan-out.
------------------------------------------------------------------------------------

DROP FUNCTION IF EXISTS xyz."fn_GetAsset";

CREATE OR REPLACE FUNCTION xyz."fn_GetAsset" (
    _projectId UUID,
    _assetId   UUID
)
RETURNS TABLE (
    "AssetId"        UUID,
    "ProjectId"      UUID,
    "AssetTypeId"    UUID,
    "ParentAssetId"  UUID,
    "Name"           TEXT,
    "CreatedBy"      TEXT,
    "InsertedOn"     TIMESTAMP WITH TIME ZONE,
    "LastModifiedOn" TIMESTAMP WITH TIME ZONE,
    "LastModifiedBy" TEXT,
    "IsDeleted"      BOOLEAN,
    "DeletedOn"      TIMESTAMP WITH TIME ZONE,
    "DeletedBy"      TEXT,
    "SystemId"       UUID
)
AS $$
DECLARE
    -- project id map
    _projectShardId INT;
BEGIN
    -- get shard id from uuid
    SELECT xyz."fn_GetProjectShardId"(_projectId) INTO _projectShardId;

    RETURN QUERY
    SELECT
        a."AssetId",
        _projectId,
        a."AssetTypeId",
        a."ParentAssetId",
        a."Name",
        a."CreatedBy",
        a."InsertedOn",
        a."LastModifiedOn",
        a."LastModifiedBy",
        a."IsDeleted",
        a."DeletedOn",
        a."DeletedBy",
        sys."SystemTypeId" AS "SystemId"
    FROM xyz."Asset" a
    LEFT JOIN LATERAL (
        SELECT m."SystemTypeId"
        FROM xyz."AssetTypeSystemTypeMapping" m
        WHERE m."ProjectShardId" = a."ProjectShardId"
          AND m."AssetTypeId"    = a."AssetTypeId"
        ORDER BY m."Id" ASC
        LIMIT 1
    ) sys ON TRUE
    WHERE a."ProjectShardId" = _projectShardId
      AND a."AssetId"        = _assetId
      AND a."IsDeleted"      = FALSE;
END;
$$
LANGUAGE plpgsql;
/