-- data_factory init schema (issue 0097).
-- Idempotente. Aplicado al arrancar via embed.FS (Go side / bridge a C++).
--
-- Tablas:
--   nodes        — extractors/transformers/databases/sinks declarados localmente
--   connections  — aristas (lineage) entre nodes
--   runs         — historico de ejecuciones (rows/kb/duration por run)
--   databases    — registro de DBs externas que sirven como sink/source
--
-- Datos NUNCA viajan entre PCs por sync (per-PC, igual que dag_engine.db).

CREATE TABLE IF NOT EXISTS nodes (
    id              TEXT PRIMARY KEY,
    kind            TEXT NOT NULL CHECK(kind IN ('extractor','transformer','database','sink','validator')),
    name            TEXT NOT NULL,
    function_id     TEXT NOT NULL DEFAULT '',   -- FK logico a registry.functions.id (sin enforcement)
    description     TEXT NOT NULL DEFAULT '',
    config_json     TEXT NOT NULL DEFAULT '{}',
    schedule_cron   TEXT NOT NULL DEFAULT '',   -- '' = manual, sino expresion cron (parseable con parse_cron_expr_go_core)
    enabled         INTEGER NOT NULL DEFAULT 1,
    tags_csv        TEXT NOT NULL DEFAULT '',
    created_at      TEXT NOT NULL,
    updated_at      TEXT NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_nodes_kind         ON nodes(kind);
CREATE INDEX IF NOT EXISTS idx_nodes_function_id  ON nodes(function_id);
CREATE INDEX IF NOT EXISTS idx_nodes_enabled      ON nodes(enabled);

CREATE TABLE IF NOT EXISTS connections (
    id              TEXT PRIMARY KEY,
    src_node        TEXT NOT NULL REFERENCES nodes(id) ON DELETE CASCADE,
    dst_node        TEXT NOT NULL REFERENCES nodes(id) ON DELETE CASCADE,
    payload_schema  TEXT NOT NULL DEFAULT '{}',  -- JSON schema del dato que viaja
    created_at      TEXT NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_connections_src ON connections(src_node);
CREATE INDEX IF NOT EXISTS idx_connections_dst ON connections(dst_node);
CREATE UNIQUE INDEX IF NOT EXISTS uniq_connection_edge ON connections(src_node, dst_node);

CREATE TABLE IF NOT EXISTS runs (
    id              TEXT PRIMARY KEY,
    node_id         TEXT NOT NULL REFERENCES nodes(id) ON DELETE CASCADE,
    started_at      TEXT NOT NULL,
    finished_at     TEXT,
    status          TEXT NOT NULL DEFAULT 'running' CHECK(status IN ('running','success','failed','cancelled')),
    rows_in         INTEGER NOT NULL DEFAULT 0,
    rows_out        INTEGER NOT NULL DEFAULT 0,
    kb_in           INTEGER NOT NULL DEFAULT 0,
    kb_out          INTEGER NOT NULL DEFAULT 0,
    duration_ms     INTEGER NOT NULL DEFAULT 0,
    trigger         TEXT NOT NULL DEFAULT 'manual' CHECK(trigger IN ('manual','cron','dag','api')),
    error           TEXT NOT NULL DEFAULT '',
    notes           TEXT NOT NULL DEFAULT ''
);

CREATE INDEX IF NOT EXISTS idx_runs_node     ON runs(node_id);
CREATE INDEX IF NOT EXISTS idx_runs_status   ON runs(status);
CREATE INDEX IF NOT EXISTS idx_runs_started  ON runs(started_at DESC);

CREATE TABLE IF NOT EXISTS databases (
    id              TEXT PRIMARY KEY,
    kind            TEXT NOT NULL CHECK(kind IN ('sqlite','postgres','bigquery','duckdb','mongo','parquet','csv','other')),
    label           TEXT NOT NULL,
    uri             TEXT NOT NULL DEFAULT '',         -- connection string redacted (no creds)
    description     TEXT NOT NULL DEFAULT '',
    tags_csv        TEXT NOT NULL DEFAULT '',
    last_seen_at    TEXT NOT NULL DEFAULT '',
    table_count     INTEGER NOT NULL DEFAULT 0,
    size_bytes      INTEGER NOT NULL DEFAULT 0,
    created_at      TEXT NOT NULL,
    updated_at      TEXT NOT NULL
);

CREATE INDEX IF NOT EXISTS idx_databases_kind ON databases(kind);