// Tests verify the schema migrations create proper table structure, indexes, and constraints

#[cfg(test)]
mod schema_verification {
    /// Test that `audit_log` table has all required columns
    #[test]
    fn test_audit_log_table_structure() {
        // When migrations run, audit_log table should have:
        // - id (UUID, PRIMARY KEY, DEFAULT gen_random_uuid())
        // - timestamp (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
        // - event_type (VARCHAR(255), NOT NULL)
        // - user_id (VARCHAR(255))
        // - username (VARCHAR(255))
        // - ip_address (INET)
        // - resource_type (VARCHAR(255))
        // - resource_id (VARCHAR(255))
        // - action (VARCHAR(255))
        // - before_state (JSONB)
        // - after_state (JSONB)
        // - status (VARCHAR(50), NOT NULL, DEFAULT 'success')
        // - error_message (TEXT)
        // - tenant_id (UUID, FOREIGN KEY to tenants.id)
        // - metadata (JSONB, DEFAULT '{}')
        // - created_at (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
    }

    /// Test that `audit_log` has proper indexes for common queries
    #[test]
    fn test_audit_log_indexes() {
        // Indexes should include:
        // - idx_audit_log_timestamp (timestamp DESC)
        // - idx_audit_log_user_id (user_id)
        // - idx_audit_log_event_type (event_type)
        // - idx_audit_log_status (status)
        // - idx_audit_log_tenant_id (tenant_id)
        // - idx_audit_log_composite (tenant_id, timestamp DESC)
        // - idx_audit_log_event_time (event_type, timestamp DESC)
    }

    /// Test that tenants table exists with required columns
    #[test]
    fn test_tenants_table_structure() {
        // tenants table should have:
        // - id (UUID, PRIMARY KEY, DEFAULT gen_random_uuid())
        // - name (VARCHAR(255), NOT NULL, UNIQUE)
        // - slug (VARCHAR(255), UNIQUE)
        // - description (TEXT)
        // - created_at (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
        // - updated_at (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
        // - metadata (JSONB, DEFAULT '{}')
        // - is_active (BOOLEAN, DEFAULT true)
    }

    /// Test that tenants table has proper indexes
    #[test]
    fn test_tenants_indexes() {
        // Indexes should include:
        // - idx_tenants_name (name)
        // - idx_tenants_slug (slug)
        // - idx_tenants_is_active (is_active)
    }

    /// Test that users table has `tenant_id` column after migrations
    #[test]
    fn test_users_table_tenant_id_column() {
        // After migrations, users table should have:
        // - tenant_id (UUID, FOREIGN KEY to tenants.id ON DELETE CASCADE)
        // - idx_users_tenant_id index
    }

    /// Test that `audit_log` table has `tenant_id` column
    #[test]
    fn test_audit_log_table_tenant_id_column() {
        // audit_log should have:
        // - tenant_id (UUID, FOREIGN KEY to tenants.id ON DELETE SET NULL)
        // - idx_audit_log_tenant_id index
    }

    /// Test that roles table exists with proper structure
    #[test]
    fn test_roles_table_structure() {
        // roles table should have:
        // - id (UUID, PRIMARY KEY, DEFAULT gen_random_uuid())
        // - tenant_id (UUID, NOT NULL, FOREIGN KEY to tenants.id ON DELETE CASCADE)
        // - name (VARCHAR(255), NOT NULL)
        // - description (TEXT)
        // - level (INT, NOT NULL, DEFAULT 100)
        // - created_at (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
        // - updated_at (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
        // - UNIQUE(tenant_id, name)
    }

    /// Test that roles table has proper indexes
    #[test]
    fn test_roles_indexes() {
        // Indexes should include:
        // - idx_roles_tenant_id (tenant_id)
        // - idx_roles_name (name)
        // - idx_roles_tenant_name (tenant_id, name)
    }

    /// Test that permissions table exists
    #[test]
    fn test_permissions_table_structure() {
        // permissions table should have:
        // - id (UUID, PRIMARY KEY, DEFAULT gen_random_uuid())
        // - resource (VARCHAR(255), NOT NULL)
        // - action (VARCHAR(255), NOT NULL)
        // - description (TEXT)
        // - created_at (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
        // - UNIQUE(resource, action)
    }

    /// Test that permissions table has proper indexes
    #[test]
    fn test_permissions_indexes() {
        // Indexes should include:
        // - idx_permissions_resource (resource)
        // - idx_permissions_resource_action (resource, action)
    }

    /// Test that permissions have default system resources
    #[test]
    fn test_default_permissions_inserted() {
        // Default permissions should include:
        // - query:read
        // - mutation:write
        // - admin:read, admin:write
        // - audit:read, audit:write
        // - rbac:read, rbac:write
        // - cache:read, cache:write
        // - config:read, config:write
        // - federation:read, federation:write
    }

    /// Test that `role_permissions` table (junction table) exists
    #[test]
    fn test_role_permissions_junction_table() {
        // role_permissions table should have:
        // - role_id (UUID, NOT NULL, FOREIGN KEY to roles.id ON DELETE CASCADE)
        // - permission_id (UUID, NOT NULL, FOREIGN KEY to permissions.id ON DELETE CASCADE)
        // - created_at (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
        // - PRIMARY KEY (role_id, permission_id)
        // - Indexes: idx_role_permissions_role_id, idx_role_permissions_permission_id
    }

    /// Test that `user_roles` table (junction table) exists
    #[test]
    fn test_user_roles_junction_table() {
        // user_roles table should have:
        // - user_id (VARCHAR(255), NOT NULL)
        // - role_id (UUID, NOT NULL, FOREIGN KEY to roles.id ON DELETE CASCADE)
        // - tenant_id (UUID, NOT NULL, FOREIGN KEY to tenants.id ON DELETE CASCADE)
        // - assigned_at (TIMESTAMPTZ, NOT NULL, DEFAULT NOW())
        // - PRIMARY KEY (user_id, role_id, tenant_id)
        // - UNIQUE(user_id, role_id)
        // - Indexes: idx_user_roles_user_id, idx_user_roles_role_id, idx_user_roles_tenant_id,
        //   idx_user_roles_user_tenant
    }

    /// Test cascade delete behavior
    #[test]
    fn test_cascade_delete_constraints() {
        // When a role is deleted:
        // - All entries in role_permissions should be deleted
        // - All entries in user_roles should be deleted
        //
        // When a tenant is deleted:
        // - All roles in that tenant should be deleted
        // - All users in that tenant should be deleted (if users.tenant_id is CASCADE)
        // - All audit_log entries should have tenant_id set to NULL (SET NULL)
    }

    /// Test role hierarchy level uniqueness
    #[test]
    fn test_role_level_uniqueness() {
        // Levels should be:
        // - Admin: 0
        // - User: 100
        // - Guest: 200
        // - etc.
        //
        // Multiple roles can have same level (level is not UNIQUE)
    }

    /// Test tenant isolation
    #[test]
    fn test_tenant_isolation_enforcement() {
        // Tenant A's roles should not appear in tenant B queries
        // Role name must be unique per tenant, but can be same across tenants
        // UNIQUE(tenant_id, name) ensures this
    }

    /// Test composite indexes for query performance
    #[test]
    fn test_composite_indexes_for_performance() {
        // Composite indexes should support common query patterns:
        // - audit_log query by tenant and time: idx_audit_log_composite (tenant_id, timestamp DESC)
        // - audit_log query by event type and time: idx_audit_log_event_time (event_type, timestamp
        //   DESC)
        // - user_roles query by user and tenant: idx_user_roles_user_tenant (user_id, tenant_id)
    }

    /// Test foreign key relationships
    #[test]
    fn test_foreign_key_relationships() {
        // Relationships should be:
        // - roles → tenants (role.tenant_id → tenant.id)
        // - user_roles → roles (user_roles.role_id → roles.id)
        // - user_roles → tenants (user_roles.tenant_id → tenants.id)
        // - role_permissions → roles (role_permissions.role_id → roles.id)
        // - role_permissions → permissions (role_permissions.permission_id → permissions.id)
        // - users → tenants (users.tenant_id → tenants.id) [if users table exists]
        // - audit_log → tenants (audit_log.tenant_id → tenants.id, NULL on delete)
    }

    /// Test idempotency of migrations
    #[test]
    fn test_migrations_idempotent() {
        // All CREATE TABLE/INDEX statements use IF NOT EXISTS
        // Running migrations twice should not fail
        // This allows:
        // - Running migrations on different environments
        // - Re-running migrations for safety
        // - Partial migration recovery
    }

    /// Test migration SQL syntax validity
    #[test]
    fn test_migration_sql_syntax() {
        // All SQL files should:
        // - Have valid PostgreSQL syntax
        // - Use appropriate data types (UUID, TIMESTAMPTZ, JSONB)
        // - Include proper DEFAULT clauses
        // - Use IF NOT EXISTS for safety
        // - Include comments explaining purpose
    }

    /// Test permissions are sufficient for all operations
    #[test]
    fn test_permissions_cover_all_operations() {
        // Permission set should support:
        // - Read queries (query:read)
        // - Write mutations (mutation:write)
        // - Admin operations (admin:read, admin:write)
        // - Audit operations (audit:read, audit:write)
        // - RBAC configuration (rbac:read, rbac:write)
        // - Cache management (cache:read, cache:write)
        // - Config management (config:read, config:write)
        // - Federation operations (federation:read, federation:write)
    }

    /// Test timestamp columns are consistent
    #[test]
    fn test_timestamp_consistency() {
        // All timestamp columns should use TIMESTAMPTZ (with timezone)
        // All DEFAULT NOW() should be present on created_at columns
        // audit_log specifically tracks creation time for compliance
    }
}
