-- Migration: Create users table
-- Core user table for authentication and profile

CREATE TABLE IF NOT EXISTS users (
    id BIGSERIAL PRIMARY KEY,
    username VARCHAR(30) NOT NULL,
    slug VARCHAR(255),
    email VARCHAR(255) NOT NULL,
    password_hash VARCHAR(255),
    token_version INTEGER NOT NULL DEFAULT 0,
    first_name VARCHAR(100),
    last_name VARCHAR(100),
    avatar TEXT,
    bio TEXT,
    location VARCHAR(100),
    birthdate TIMESTAMP WITH TIME ZONE,
    gender VARCHAR(20),
    username_changed_at TIMESTAMP WITH TIME ZONE,
    role VARCHAR(50) NOT NULL DEFAULT 'user',
    is_active BOOLEAN DEFAULT TRUE,
    is_verified BOOLEAN DEFAULT FALSE,
    is_admin BOOLEAN DEFAULT FALSE,
    is_public BOOLEAN DEFAULT TRUE,
    last_login_at TIMESTAMP WITH TIME ZONE,
    created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
    deleted_at TIMESTAMP WITH TIME ZONE
);

-- Unique indexes with soft delete support
CREATE UNIQUE INDEX IF NOT EXISTS idx_users_email ON users(email) WHERE deleted_at IS NULL;
CREATE UNIQUE INDEX IF NOT EXISTS idx_users_username ON users(username) WHERE deleted_at IS NULL;
CREATE UNIQUE INDEX IF NOT EXISTS idx_users_slug ON users(slug) WHERE deleted_at IS NULL;

-- Performance indexes
CREATE INDEX IF NOT EXISTS idx_users_deleted_at ON users(deleted_at);
CREATE INDEX IF NOT EXISTS idx_users_created_at ON users(created_at DESC);
CREATE INDEX IF NOT EXISTS idx_users_is_active ON users(is_active) WHERE deleted_at IS NULL;

-- Comments
COMMENT ON TABLE users IS 'Core user accounts for authentication and profiles';
COMMENT ON COLUMN users.token_version IS 'Version number for JWT token invalidation';
COMMENT ON COLUMN users.slug IS 'URL-friendly unique identifier for user profile';