-- Add missing columns to users table
ALTER TABLE users
    ADD COLUMN IF NOT EXISTS full_name VARCHAR(255),
    ADD COLUMN IF NOT EXISTS phone VARCHAR(20) UNIQUE,
    ADD COLUMN IF NOT EXISTS email_verified BOOLEAN NOT NULL DEFAULT false,
    ADD COLUMN IF NOT EXISTS phone_verified BOOLEAN NOT NULL DEFAULT false,
    ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ;

-- user_roles: many-to-many, a user can hold multiple external roles
CREATE TABLE IF NOT EXISTS user_roles (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role_id UUID NOT NULL REFERENCES roles(id) ON DELETE CASCADE,
    status VARCHAR(50) NOT NULL DEFAULT 'PENDING', -- PENDING, APPROVED, REJECTED, SUSPENDED
    approved_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(user_id, role_id)
);

-- role_permissions
CREATE TABLE IF NOT EXISTS role_permissions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    role_id UUID NOT NULL REFERENCES roles(id) ON DELETE CASCADE,
    permission_key VARCHAR(100) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    UNIQUE(role_id, permission_key)
);

-- departments for internal staff
CREATE TABLE IF NOT EXISTS departments (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(100) NOT NULL UNIQUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- designations for internal staff
CREATE TABLE IF NOT EXISTS designations (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(100) NOT NULL UNIQUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- employees (internal staff records)
CREATE TABLE IF NOT EXISTS employees (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE UNIQUE,
    role_id UUID NOT NULL REFERENCES roles(id),
    department_id UUID REFERENCES departments(id),
    designation_id UUID REFERENCES designations(id),
    employee_code VARCHAR(50),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- onboarding_submissions: tracks verification submissions
CREATE TABLE IF NOT EXISTS onboarding_submissions (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role_id UUID NOT NULL REFERENCES roles(id),
    config_id UUID REFERENCES onboarding_configs(id),
    data_json JSONB,
    status VARCHAR(50) NOT NULL DEFAULT 'DRAFT',
    submitted_at TIMESTAMPTZ,
    reviewed_at TIMESTAMPTZ,
    reviewed_by UUID REFERENCES users(id),
    rejection_reason TEXT,
    document_request TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- submission_documents: uploaded files for onboarding
CREATE TABLE IF NOT EXISTS submission_documents (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    submission_id UUID NOT NULL REFERENCES onboarding_submissions(id) ON DELETE CASCADE,
    document_type VARCHAR(100) NOT NULL,
    file_url VARCHAR(500) NOT NULL,
    file_name VARCHAR(255),
    uploaded_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_user_roles_user_id ON user_roles(user_id);
CREATE INDEX IF NOT EXISTS idx_user_roles_status ON user_roles(status);
CREATE INDEX IF NOT EXISTS idx_onboarding_submissions_user_id ON onboarding_submissions(user_id);
CREATE INDEX IF NOT EXISTS idx_onboarding_submissions_status ON onboarding_submissions(status);