-- SeCu Partnerships (Subunternehmer-System)
-- Version: 1.1.0

-- Partnerschaften zwischen Organisationen
CREATE TABLE IF NOT EXISTS org_partnerships (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    
    -- Hauptunternehmer (der Aufträge vergibt)
    contractor_org_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
    
    -- Subunternehmer (der Mitarbeiter stellt)
    subcontractor_org_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
    
    -- Status der Partnerschaft
    status VARCHAR(20) NOT NULL DEFAULT 'pending' 
        CHECK (status IN ('pending', 'active', 'paused', 'terminated')),
    
    -- Vertragsdetails
    contract_start DATE,
    contract_end DATE,
    notes TEXT,
    
    -- Wer hat eingeladen
    invited_by UUID REFERENCES users(id),
    accepted_by UUID REFERENCES users(id),
    accepted_at TIMESTAMP WITH TIME ZONE,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    -- Ein Subunternehmer kann nur einmal pro Hauptunternehmer existieren
    UNIQUE(contractor_org_id, subcontractor_org_id),
    
    -- Keine Selbst-Partnerschaft
    CHECK (contractor_org_id != subcontractor_org_id)
);

-- Stundensätze und Konditionen pro Partnerschaft
CREATE TABLE IF NOT EXISTS partnership_rates (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    partnership_id UUID NOT NULL REFERENCES org_partnerships(id) ON DELETE CASCADE,
    
    -- Art des Satzes
    rate_type VARCHAR(50) NOT NULL DEFAULT 'hourly',  -- hourly, daily, fixed, per_order
    
    -- Bezeichnung (z.B. "Normaldienst", "Nachtdienst", "Wochenende")
    name VARCHAR(100) NOT NULL,
    description TEXT,
    
    -- Betrag in Cent (für Genauigkeit)
    amount_cents INTEGER NOT NULL,
    currency VARCHAR(3) DEFAULT 'EUR',
    
    -- Gültigkeit
    valid_from DATE DEFAULT CURRENT_DATE,
    valid_until DATE,
    
    -- Standard-Satz?
    is_default BOOLEAN DEFAULT false,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Geteilte Aufträge (Hauptunternehmer -> Subunternehmer)
CREATE TABLE IF NOT EXISTS shared_orders (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    partnership_id UUID NOT NULL REFERENCES org_partnerships(id) ON DELETE CASCADE,
    
    -- Original-Auftrag beim Hauptunternehmer
    original_order_id UUID NOT NULL REFERENCES orders(id) ON DELETE CASCADE,
    
    -- Kopie/Referenz beim Subunternehmer (optional, wenn sie eigene Aufträge anlegen)
    sub_order_id UUID REFERENCES orders(id) ON DELETE SET NULL,
    
    -- Welcher Satz gilt für diesen Auftrag
    rate_id UUID REFERENCES partnership_rates(id),
    
    -- Anzahl benötigter Mitarbeiter vom Subunternehmer
    required_staff INTEGER DEFAULT 1,
    
    -- Status
    status VARCHAR(20) NOT NULL DEFAULT 'requested'
        CHECK (status IN ('requested', 'accepted', 'declined', 'completed', 'cancelled')),
    
    -- Notizen zwischen den Unternehmen
    contractor_notes TEXT,
    subcontractor_notes TEXT,
    
    responded_at TIMESTAMP WITH TIME ZONE,
    completed_at TIMESTAMP WITH TIME ZONE,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Stundenzettel von Subunternehmer-Mitarbeitern für geteilte Aufträge
CREATE TABLE IF NOT EXISTS partnership_timesheets (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    shared_order_id UUID NOT NULL REFERENCES shared_orders(id) ON DELETE CASCADE,
    
    -- Original-Stundenzettel beim Subunternehmer
    timesheet_id UUID NOT NULL REFERENCES timesheets(id) ON DELETE CASCADE,
    
    -- Welcher Satz wurde angewendet
    rate_id UUID REFERENCES partnership_rates(id),
    
    -- Berechneter Betrag
    calculated_amount_cents INTEGER,
    
    -- Status der Freigabe durch Hauptunternehmer
    approval_status VARCHAR(20) DEFAULT 'pending'
        CHECK (approval_status IN ('pending', 'approved', 'disputed', 'rejected')),
    
    approved_by UUID REFERENCES users(id),
    approved_at TIMESTAMP WITH TIME ZONE,
    dispute_reason TEXT,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Abrechnungen zwischen Partnern
CREATE TABLE IF NOT EXISTS partnership_invoices (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    partnership_id UUID NOT NULL REFERENCES org_partnerships(id) ON DELETE CASCADE,
    
    -- Rechnungsnummer
    invoice_number VARCHAR(50) NOT NULL,
    
    -- Abrechnungszeitraum
    period_start DATE NOT NULL,
    period_end DATE NOT NULL,
    
    -- Beträge
    subtotal_cents INTEGER NOT NULL DEFAULT 0,
    tax_percent DECIMAL(5,2) DEFAULT 19.00,
    tax_cents INTEGER NOT NULL DEFAULT 0,
    total_cents INTEGER NOT NULL DEFAULT 0,
    
    -- Status
    status VARCHAR(20) NOT NULL DEFAULT 'draft'
        CHECK (status IN ('draft', 'sent', 'paid', 'overdue', 'cancelled')),
    
    -- Daten
    issued_at TIMESTAMP WITH TIME ZONE,
    due_date DATE,
    paid_at TIMESTAMP WITH TIME ZONE,
    
    -- PDF-Link (wenn generiert)
    pdf_url TEXT,
    
    -- Notizen
    notes TEXT,
    
    created_by UUID REFERENCES users(id),
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Rechnungspositionen
CREATE TABLE IF NOT EXISTS partnership_invoice_items (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    invoice_id UUID NOT NULL REFERENCES partnership_invoices(id) ON DELETE CASCADE,
    
    -- Referenz zum Stundenzettel (optional)
    partnership_timesheet_id UUID REFERENCES partnership_timesheets(id),
    
    -- Beschreibung
    description TEXT NOT NULL,
    
    -- Mengen und Preise
    quantity DECIMAL(10,2) NOT NULL DEFAULT 1,
    unit VARCHAR(20) DEFAULT 'Stunden',
    unit_price_cents INTEGER NOT NULL,
    total_cents INTEGER NOT NULL,
    
    -- Datum der Leistung
    service_date DATE,
    
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Indexes
CREATE INDEX IF NOT EXISTS idx_partnerships_contractor ON org_partnerships(contractor_org_id);
CREATE INDEX IF NOT EXISTS idx_partnerships_subcontractor ON org_partnerships(subcontractor_org_id);
CREATE INDEX IF NOT EXISTS idx_partnerships_status ON org_partnerships(status);
CREATE INDEX IF NOT EXISTS idx_shared_orders_partnership ON shared_orders(partnership_id);
CREATE INDEX IF NOT EXISTS idx_shared_orders_original ON shared_orders(original_order_id);
CREATE INDEX IF NOT EXISTS idx_partnership_timesheets_shared ON partnership_timesheets(shared_order_id);
CREATE INDEX IF NOT EXISTS idx_partnership_invoices_partnership ON partnership_invoices(partnership_id);
CREATE INDEX IF NOT EXISTS idx_partnership_invoices_status ON partnership_invoices(status);

-- Partnership-Modul registrieren
INSERT INTO modules (name, display_name, description, is_core, default_config) VALUES
    ('partnerships', 'Subunternehmer', 'Zusammenarbeit mit Subunternehmen inkl. Abrechnung', false, 
     '{"auto_approve_timesheets": false, "default_payment_days": 30}')
ON CONFLICT (name) DO NOTHING;