-- SurrealDB Schema for Logseq Blocks Support
-- This schema extends the KOGRAL system to support block-level storage and querying

-- Define namespace and database
-- USE NS kogral;
-- USE DB default;

-- ============================================================================
-- BLOCK TABLE
-- ============================================================================

DEFINE TABLE block SCHEMAFULL;

-- Fields
DEFINE FIELD node_id ON block TYPE record(node) ASSERT $value != NONE;
DEFINE FIELD block_id ON block TYPE string ASSERT $value != NONE;
DEFINE FIELD content ON block TYPE string;
DEFINE FIELD parent_id ON block TYPE option<string>;
DEFINE FIELD created ON block TYPE datetime;
DEFINE FIELD modified ON block TYPE datetime;

-- Properties (flexible object for block metadata)
DEFINE FIELD properties ON block TYPE object;
DEFINE FIELD properties.tags ON block TYPE array;
DEFINE FIELD properties.status ON block TYPE option<string>;
DEFINE FIELD properties.custom ON block TYPE option<object>;
DEFINE FIELD properties.block_refs ON block TYPE array;
DEFINE FIELD properties.page_refs ON block TYPE array;

-- ============================================================================
-- INDEXES
-- ============================================================================

-- Index on node_id for fast lookup of all blocks in a node
DEFINE INDEX block_node_idx ON block COLUMNS node_id;

-- Index on block_id for direct block lookup
DEFINE INDEX block_id_idx ON block COLUMNS block_id UNIQUE;

-- Index on tags for tag-based queries (find all #card blocks)
DEFINE INDEX block_tags_idx ON block COLUMNS properties.tags;

-- Index on status for TODO/DONE queries
DEFINE INDEX block_status_idx ON block COLUMNS properties.status;

-- Index on parent_id for hierarchical queries
DEFINE INDEX block_parent_idx ON block COLUMNS parent_id;

-- Full-text search index on content
DEFINE INDEX block_content_search ON block COLUMNS content SEARCH ANALYZER simple BM25;

-- ============================================================================
-- QUERIES (Examples)
-- ============================================================================

-- Find all blocks with a specific tag
-- SELECT * FROM block WHERE $tag IN properties.tags;

-- Find all TODO blocks
-- SELECT * FROM block WHERE properties.status = "TODO";

-- Find all blocks in a specific node
-- SELECT * FROM block WHERE node_id = $node_record_id;

-- Find blocks with custom property
-- SELECT * FROM block WHERE properties.custom[$key] = $value;

-- Full-text search in block content
-- SELECT * FROM block WHERE content @@ $search_term;

-- Get block hierarchy (parent and all children)
-- SELECT *,
--   (SELECT * FROM block WHERE parent_id = $parent.block_id) AS children
-- FROM block WHERE block_id = $parent_block_id;

-- ============================================================================
-- RELATIONSHIPS
-- ============================================================================

-- Block belongs to a Node
DEFINE FIELD node_id ON block TYPE record(node);

-- Example: Get all blocks for a node with their content
-- SELECT * FROM block WHERE node_id = $node_id ORDER BY created ASC;

-- Example: Count blocks by tag across all nodes
-- SELECT
--   array::flatten(properties.tags) AS tag,
--   count() AS count
-- FROM block
-- GROUP BY tag
-- ORDER BY count DESC;

-- Example: Get all flashcards (#card) across the knowledge base
-- SELECT
--   node_id.title AS node_title,
--   content,
--   properties
-- FROM block
-- WHERE "card" IN properties.tags;

-- ============================================================================
-- MIGRATION QUERIES
-- ============================================================================

-- Populate blocks table from existing nodes (run once)
-- This would be executed by the sync mechanism or migration script

-- Example migration pseudocode:
-- FOR node IN (SELECT * FROM node) {
--   LET parsed_blocks = parse_markdown(node.content);
--   FOR block IN parsed_blocks {
--     CREATE block CONTENT {
--       node_id: node.id,
--       block_id: block.id,
--       content: block.content,
--       parent_id: block.parent_id,
--       created: block.created,
--       modified: block.modified,
--       properties: {
--         tags: block.properties.tags,
--         status: block.properties.status,
--         custom: block.properties.custom,
--         block_refs: block.properties.block_refs,
--         page_refs: block.properties.page_refs
--       }
--     };
--   }
-- }

-- ============================================================================
-- CLEANUP QUERIES
-- ============================================================================

-- Delete all blocks for a specific node
-- DELETE block WHERE node_id = $node_record_id;

-- Delete orphaned blocks (node no longer exists)
-- DELETE block WHERE node_id NOT IN (SELECT id FROM node);