-- SeCu Database Schema
-- Version: 1.0.0
-- Date: 2026-02-20

-- Enable UUID extension
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

-- ============================================
-- ORGANIZATIONS (Multi-Tenancy)
-- ============================================
CREATE TABLE organizations (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name VARCHAR(255) NOT NULL,
    slug VARCHAR(100) UNIQUE NOT NULL,
    settings JSONB DEFAULT '{}',
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX idx_organizations_slug ON organizations(slug);

-- ============================================
-- USERS
-- ============================================
CREATE TYPE user_role AS ENUM ('chef', 'disponent', 'mitarbeiter');

CREATE TABLE users (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    org_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
    email VARCHAR(255) NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    role user_role NOT NULL DEFAULT 'mitarbeiter',
    first_name VARCHAR(100) NOT NULL,
    last_name VARCHAR(100) NOT NULL,
    phone VARCHAR(50),
    avatar_url VARCHAR(500),
    created_by UUID REFERENCES users(id) ON DELETE SET NULL,
    managed_by UUID REFERENCES users(id) ON DELETE SET NULL,
    active BOOLEAN DEFAULT true,
    last_login TIMESTAMP WITH TIME ZONE,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    UNIQUE(org_id, email)
);

CREATE INDEX idx_users_org ON users(org_id);
CREATE INDEX idx_users_role ON users(org_id, role);
CREATE INDEX idx_users_managed_by ON users(managed_by);

-- ============================================
-- ORDERS (Aufträge)
-- ============================================
CREATE TYPE order_status AS ENUM ('draft', 'published', 'in_progress', 'completed', 'cancelled');

CREATE TABLE orders (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    org_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
    number SERIAL,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    location VARCHAR(255),
    address TEXT,
    client_name VARCHAR(255),
    client_contact VARCHAR(255),
    status order_status DEFAULT 'draft',
    start_time TIMESTAMP WITH TIME ZONE,
    end_time TIMESTAMP WITH TIME ZONE,
    required_staff INTEGER DEFAULT 1,
    special_instructions TEXT,
    created_by UUID NOT NULL REFERENCES users(id) ON DELETE RESTRICT,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX idx_orders_org ON orders(org_id);
CREATE INDEX idx_orders_status ON orders(org_id, status);
CREATE INDEX idx_orders_dates ON orders(org_id, start_time, end_time);

-- ============================================
-- ORDER ASSIGNMENTS (Zuweisungen)
-- ============================================
CREATE TYPE assignment_status AS ENUM ('pending', 'confirmed', 'declined', 'completed');

CREATE TABLE order_assignments (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    order_id UUID NOT NULL REFERENCES orders(id) ON DELETE CASCADE,
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    status assignment_status DEFAULT 'pending',
    note TEXT,
    confirmed_at TIMESTAMP WITH TIME ZONE,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    UNIQUE(order_id, user_id)
);

CREATE INDEX idx_assignments_order ON order_assignments(order_id);
CREATE INDEX idx_assignments_user ON order_assignments(user_id);

-- ============================================
-- AVAILABILITY (Verfügbarkeit)
-- ============================================
CREATE TABLE availability (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    date DATE NOT NULL,
    available BOOLEAN NOT NULL DEFAULT true,
    time_from TIME,
    time_to TIME,
    note TEXT,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    UNIQUE(user_id, date)
);

CREATE INDEX idx_availability_user_date ON availability(user_id, date);

-- ============================================
-- TIMESHEETS (Stundenzettel)
-- ============================================
CREATE TYPE timesheet_status AS ENUM ('pending', 'approved', 'rejected');

CREATE TABLE timesheets (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    order_id UUID REFERENCES orders(id) ON DELETE SET NULL,
    work_date DATE NOT NULL,
    start_time TIME,
    end_time TIME,
    hours_worked DECIMAL(5,2),
    photo_url VARCHAR(500),
    status timesheet_status DEFAULT 'pending',
    approved_by UUID REFERENCES users(id) ON DELETE SET NULL,
    rejection_reason TEXT,
    approved_at TIMESTAMP WITH TIME ZONE,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX idx_timesheets_user ON timesheets(user_id);
CREATE INDEX idx_timesheets_order ON timesheets(order_id);
CREATE INDEX idx_timesheets_status ON timesheets(status);
CREATE INDEX idx_timesheets_date ON timesheets(work_date);

-- ============================================
-- MODULES (Modularer Aufbau)
-- ============================================
CREATE TABLE modules (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name VARCHAR(100) UNIQUE NOT NULL,
    display_name VARCHAR(255) NOT NULL,
    description TEXT,
    is_core BOOLEAN DEFAULT false,
    default_config JSONB DEFAULT '{}',
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE TABLE organization_modules (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    org_id UUID NOT NULL REFERENCES organizations(id) ON DELETE CASCADE,
    module_id UUID NOT NULL REFERENCES modules(id) ON DELETE CASCADE,
    enabled BOOLEAN DEFAULT true,
    config JSONB DEFAULT '{}',
    enabled_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    
    UNIQUE(org_id, module_id)
);

CREATE INDEX idx_org_modules ON organization_modules(org_id);

-- ============================================
-- AUDIT LOGS
-- ============================================
CREATE TABLE audit_logs (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    org_id UUID REFERENCES organizations(id) ON DELETE CASCADE,
    user_id UUID REFERENCES users(id) ON DELETE SET NULL,
    action VARCHAR(100) NOT NULL,
    entity_type VARCHAR(100),
    entity_id UUID,
    old_values JSONB,
    new_values JSONB,
    ip_address INET,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX idx_audit_org ON audit_logs(org_id);
CREATE INDEX idx_audit_user ON audit_logs(user_id);
CREATE INDEX idx_audit_entity ON audit_logs(entity_type, entity_id);
CREATE INDEX idx_audit_date ON audit_logs(created_at);

-- ============================================
-- REFRESH TOKENS
-- ============================================
CREATE TABLE refresh_tokens (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    token_hash VARCHAR(255) UNIQUE NOT NULL,
    expires_at TIMESTAMP WITH TIME ZONE NOT NULL,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

CREATE INDEX idx_refresh_tokens_user ON refresh_tokens(user_id);
CREATE INDEX idx_refresh_tokens_expires ON refresh_tokens(expires_at);

-- ============================================
-- UPDATED_AT TRIGGER
-- ============================================
CREATE OR REPLACE FUNCTION update_updated_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

CREATE TRIGGER update_organizations_updated_at BEFORE UPDATE ON organizations
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

CREATE TRIGGER update_users_updated_at BEFORE UPDATE ON users
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

CREATE TRIGGER update_orders_updated_at BEFORE UPDATE ON orders
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

CREATE TRIGGER update_availability_updated_at BEFORE UPDATE ON availability
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

CREATE TRIGGER update_timesheets_updated_at BEFORE UPDATE ON timesheets
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();

CREATE TRIGGER update_org_modules_updated_at BEFORE UPDATE ON organization_modules
    FOR EACH ROW EXECUTE FUNCTION update_updated_at();