-- Doku-only (siehe README.md in diesem Verzeichnis) — die tatsächliche
-- Ausführung passiert idempotent über internal/storage/taxonomy.go
-- initTaxonomySchema(), aufgerufen aus (*Store).initSchema().
--
-- Strukturierte Entitäten (Tags/Dokumenttypen/Korrespondenten) statt der
-- bisherigen documents.doc_type/correspondent-Freitextfelder (die bleiben
-- unangetastet, Bestandsschutz), plus Barcode-Erkennung fuer automatische
-- Zuordnung beim Ingest (siehe internal/matching, internal/barcode).

CREATE TABLE IF NOT EXISTS tags (
    id              BIGSERIAL PRIMARY KEY,
    tenant_id       BIGINT NOT NULL,
    name            TEXT NOT NULL,
    color           TEXT,
    match_algorithm TEXT NOT NULL DEFAULT 'none' CHECK (match_algorithm IN ('none','any','all','exact','regex','fuzzy')),
    match_pattern   TEXT,
    case_sensitive  BOOLEAN NOT NULL DEFAULT false,
    barcode_value   TEXT,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
    UNIQUE(tenant_id, name)
);

CREATE TABLE IF NOT EXISTS document_types (
    id              BIGSERIAL PRIMARY KEY,
    tenant_id       BIGINT NOT NULL,
    name            TEXT NOT NULL,
    color           TEXT,
    match_algorithm TEXT NOT NULL DEFAULT 'none' CHECK (match_algorithm IN ('none','any','all','exact','regex','fuzzy')),
    match_pattern   TEXT,
    case_sensitive  BOOLEAN NOT NULL DEFAULT false,
    barcode_value   TEXT,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
    UNIQUE(tenant_id, name)
);

CREATE TABLE IF NOT EXISTS correspondents (
    id              BIGSERIAL PRIMARY KEY,
    tenant_id       BIGINT NOT NULL,
    name            TEXT NOT NULL,
    color           TEXT,
    match_algorithm TEXT NOT NULL DEFAULT 'none' CHECK (match_algorithm IN ('none','any','all','exact','regex','fuzzy')),
    match_pattern   TEXT,
    case_sensitive  BOOLEAN NOT NULL DEFAULT false,
    barcode_value   TEXT,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
    UNIQUE(tenant_id, name)
);

CREATE TABLE IF NOT EXISTS document_tags (
    document_id BIGINT NOT NULL REFERENCES documents(id) ON DELETE CASCADE,
    tag_id      BIGINT NOT NULL REFERENCES tags(id) ON DELETE CASCADE,
    PRIMARY KEY (document_id, tag_id)
);

CREATE INDEX IF NOT EXISTS idx_tags_tenant ON tags(tenant_id);
CREATE INDEX IF NOT EXISTS idx_document_types_tenant ON document_types(tenant_id);
CREATE INDEX IF NOT EXISTS idx_correspondents_tenant ON correspondents(tenant_id);
CREATE INDEX IF NOT EXISTS idx_document_tags_tag ON document_tags(tag_id);

CREATE UNIQUE INDEX IF NOT EXISTS idx_tags_tenant_barcode ON tags(tenant_id, barcode_value) WHERE barcode_value IS NOT NULL;
CREATE UNIQUE INDEX IF NOT EXISTS idx_document_types_tenant_barcode ON document_types(tenant_id, barcode_value) WHERE barcode_value IS NOT NULL;
CREATE UNIQUE INDEX IF NOT EXISTS idx_correspondents_tenant_barcode ON correspondents(tenant_id, barcode_value) WHERE barcode_value IS NOT NULL;

-- documents: neue Spalten, alte doc_type/correspondent-Textspalten bleiben
-- unveraendert (Bestandsschutz fuer vorhandene GoBD-Metadaten).
ALTER TABLE documents ADD COLUMN IF NOT EXISTS doc_type_id BIGINT REFERENCES document_types(id);
ALTER TABLE documents ADD COLUMN IF NOT EXISTS correspondent_id BIGINT REFERENCES correspondents(id);
ALTER TABLE documents ADD COLUMN IF NOT EXISTS barcode_values JSONB;