-- =========================================================
-- Migration 147: Compliance Template Rules — profilbasierte Empfehlungs-Regeln
-- mit Versionierung, Approval-Workflow und Tenant-Overrides.
--
-- Ersetzt langfristig die hartcodierten Regeln in
-- admin-compliance/app/sdk/document-generator/templateRecommendations.ts.
-- =========================================================

-- compliance_template_rules: Regel-Hülle (eine Regel = eine document_type-Empfehlung)
CREATE TABLE IF NOT EXISTS compliance_template_rules (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    rule_key VARCHAR(150) NOT NULL UNIQUE,        -- z.B. "whistleblower_required_50plus"
    document_type VARCHAR(100) NOT NULL,          -- z.B. "whistleblower_policy"
    title VARCHAR(300) NOT NULL,                  -- kurzer Anzeigename
    current_version_id UUID,                      -- pointet auf published Version, null bis erste Freigabe
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW()
);

-- compliance_template_rule_versions: Versionen mit Lifecycle + Approval-Trail
CREATE TABLE IF NOT EXISTS compliance_template_rule_versions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    rule_id UUID NOT NULL REFERENCES compliance_template_rules(id) ON DELETE CASCADE,
    version_number INT NOT NULL,

    -- Lifecycle (analog compliance_legal_document_versions)
    status VARCHAR(20) NOT NULL DEFAULT 'draft',  -- draft|review|approved|published|archived|rejected
    is_live SMALLINT NOT NULL DEFAULT 0,          -- 1 = aktuell published Version dieser Regel

    -- Klassifikation der Empfehlung
    classification VARCHAR(20) NOT NULL,          -- required | recommended | optional

    -- Bedingung als strukturiertes JSONB
    -- Format: { "kind": "all"|"any", "clauses": [{ "field": "...", "op": "...", "value": ... }] }
    conditions JSONB NOT NULL DEFAULT '{"kind":"all","clauses":[]}'::jsonb,

    -- Editorial-Pflichtfelder
    source_citation TEXT NOT NULL DEFAULT '',     -- "§ 12 HinSchG", "EuGH C-311/18", "DSK Kurzpapier Nr. 18"
    rationale TEXT,                                -- Freitext-Begründung des Anwalts
    change_summary TEXT,                           -- Pflicht beim Einreichen (was wurde geändert)

    -- Approval-Trail (vereinfacht; volle Action-Liste in approvals-Tabelle)
    created_by VARCHAR(200),
    submitted_by VARCHAR(200),
    submitted_at TIMESTAMPTZ,
    approved_by VARCHAR(200),
    approved_at TIMESTAMPTZ,
    published_by VARCHAR(200),
    published_at TIMESTAMPTZ,
    rejected_by VARCHAR(200),
    rejected_at TIMESTAMPTZ,
    rejection_reason TEXT,

    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    UNIQUE (rule_id, version_number),
    CHECK (classification IN ('required', 'recommended', 'optional')),
    CHECK (status IN ('draft', 'review', 'approved', 'published', 'archived', 'rejected')),
    CHECK (is_live IN (0, 1))
);

-- Genau eine published/live Version pro Regel
CREATE UNIQUE INDEX IF NOT EXISTS idx_rule_versions_one_live
    ON compliance_template_rule_versions(rule_id) WHERE is_live = 1;

-- compliance_template_rule_approvals: Audit-Trail aller Lifecycle-Aktionen
CREATE TABLE IF NOT EXISTS compliance_template_rule_approvals (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    version_id UUID NOT NULL REFERENCES compliance_template_rule_versions(id) ON DELETE CASCADE,
    action VARCHAR(50) NOT NULL,                  -- submitted|approved|rejected|published|archived
    approver VARCHAR(200),
    comment TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- compliance_tenant_rule_overrides: Pro Kanzlei/Tenant Override einer globalen Regel
CREATE TABLE IF NOT EXISTS compliance_tenant_rule_overrides (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    tenant_id VARCHAR(100) NOT NULL,
    rule_id UUID NOT NULL REFERENCES compliance_template_rules(id) ON DELETE CASCADE,
    override_classification VARCHAR(20),          -- null = Regel komplett für Tenant deaktiviert
    reason TEXT NOT NULL,                          -- Pflicht: warum dieser Override
    created_by VARCHAR(200),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),

    CONSTRAINT chk_override_classification CHECK (
        override_classification IS NULL OR
        override_classification IN ('required', 'recommended', 'optional')
    )
);

-- Indizes
CREATE INDEX IF NOT EXISTS idx_template_rules_type
    ON compliance_template_rules(document_type);
CREATE INDEX IF NOT EXISTS idx_rule_versions_rule
    ON compliance_template_rule_versions(rule_id);
CREATE INDEX IF NOT EXISTS idx_rule_versions_status
    ON compliance_template_rule_versions(status);
CREATE INDEX IF NOT EXISTS idx_rule_approvals_version
    ON compliance_template_rule_approvals(version_id);
CREATE INDEX IF NOT EXISTS idx_tenant_overrides_tenant
    ON compliance_tenant_rule_overrides(tenant_id);
CREATE UNIQUE INDEX IF NOT EXISTS idx_tenant_overrides_unique
    ON compliance_tenant_rule_overrides(tenant_id, rule_id);