-- Users table
CREATE TABLE IF NOT EXISTS users (
    id SERIAL PRIMARY KEY,
    username VARCHAR(100) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    role VARCHAR(20) NOT NULL DEFAULT 'user' CHECK (role IN ('admin', 'user')),
    mfa_secret VARCHAR(255),
    mfa_enabled BOOLEAN DEFAULT FALSE,
    must_change_password BOOLEAN DEFAULT TRUE,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Field definitions table (dynamic fields configured by admin)
CREATE TABLE IF NOT EXISTS field_definitions (
    id SERIAL PRIMARY KEY,
    field_key VARCHAR(100) UNIQUE NOT NULL,   -- internal key e.g. "first_name"
    label VARCHAR(200) NOT NULL,              -- display label e.g. "First Name"
    field_type VARCHAR(20) NOT NULL DEFAULT 'text' CHECK (field_type IN ('text', 'number', 'phone', 'email')),
    required BOOLEAN DEFAULT FALSE,
    sort_order INTEGER DEFAULT 0,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Contracts table with JSONB data (fully dynamic)
CREATE TABLE IF NOT EXISTS mobile_contracts (
    id SERIAL PRIMARY KEY,
    data JSONB NOT NULL DEFAULT '{}',
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Audit log table
CREATE TABLE IF NOT EXISTS audit_log (
    id SERIAL PRIMARY KEY,
    user_id INTEGER REFERENCES users(id),
    action VARCHAR(100) NOT NULL,
    details TEXT,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW()
);

-- Seed default fields
INSERT INTO field_definitions (field_key, label, field_type, required, sort_order) VALUES
    ('first_name',              'First Name',              'text',   TRUE,  1),
    ('last_name',               'Last Name',               'text',   TRUE,  2),
    ('phone_number',            'Phone Number',            'phone',  FALSE, 3),
    ('mobile_contract_number',  'Mobile Contract Number',  'text',   FALSE, 4),
    ('monthly_fixed_cost',      'Monthly Fixed Cost',      'number', FALSE, 5),
    ('monthly_available_data',  'Monthly Available Data',  'number', FALSE, 6)
ON CONFLICT (field_key) DO NOTHING;