CREATE TABLE IF NOT EXISTS inv_categories (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(150) NOT NULL,
    code VARCHAR(50) NULL,
    description TEXT NULL,
    color VARCHAR(20) NOT NULL DEFAULT '#6c757d',
    -- when 1, the equipment form requires a production line
    requires_line TINYINT(1) NOT NULL DEFAULT 0,
    sort_order INT UNSIGNED NOT NULL DEFAULT 999,
    is_active TINYINT(1) NOT NULL DEFAULT 1,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    UNIQUE KEY uniq_inv_categories_name (name),
    KEY idx_inv_categories_active (is_active, sort_order)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS inv_equipment_files (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    equipment_id INT NOT NULL,
    kind VARCHAR(10) NOT NULL DEFAULT 'file',
    original_name VARCHAR(500) NOT NULL,
    stored_name VARCHAR(500) NOT NULL,
    mime_type VARCHAR(100) NULL,
    size INT UNSIGNED NULL,
    uploaded_by INT UNSIGNED NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    KEY idx_inv_files_equipment (equipment_id, kind),
    CONSTRAINT fk_inv_files_equipment FOREIGN KEY (equipment_id)
        REFERENCES inv_equipment (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS maint_maintenances (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    equipment_id INT NOT NULL,
    -- letter code as used on the paper form (A, B, C, ...)
    code VARCHAR(10) NULL,
    title VARCHAR(500) NOT NULL,
    description TEXT NULL,
    intervention_type VARCHAR(20) NOT NULL DEFAULT 'scheduled',
    execution_type VARCHAR(20) NOT NULL DEFAULT 'internal',
    is_critical TINYINT(1) NOT NULL DEFAULT 0,
    -- frequency: NULL value + unit 'on_demand' means "no automatic due date"
    frequency_value SMALLINT UNSIGNED NULL,
    frequency_unit VARCHAR(20) NOT NULL DEFAULT 'month',
    -- free text for the irregular cases in the client's sheets
    -- ("prima dell'accensione / d'estate settimanale / dopo lo spegnimento")
    frequency_note VARCHAR(500) NULL,
    alert_days SMALLINT UNSIGNED NOT NULL DEFAULT 7,
    assignee_employee_id INT UNSIGNED NULL,
    supervisor_employee_id INT UNSIGNED NULL,
    supplier_id INT NULL,
    is_active TINYINT(1) NOT NULL DEFAULT 1,
    -- denormalised, recomputed on every intervention change
    last_done_date DATE NULL,
    next_due_date DATE NULL,
    notes TEXT NULL,
    created_by INT UNSIGNED NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    KEY idx_maint_equipment (equipment_id),
    KEY idx_maint_due (next_due_date),
    KEY idx_maint_type (intervention_type, is_active),
    CONSTRAINT fk_maint_equipment FOREIGN KEY (equipment_id)
        REFERENCES inv_equipment (id) ON DELETE CASCADE,
    CONSTRAINT fk_maint_assignee FOREIGN KEY (assignee_employee_id)
        REFERENCES employees (id) ON DELETE SET NULL,
    CONSTRAINT fk_maint_supervisor FOREIGN KEY (supervisor_employee_id)
        REFERENCES employees (id) ON DELETE SET NULL,
    CONSTRAINT fk_maint_supplier FOREIGN KEY (supplier_id)
        REFERENCES suppliers (idsupplier) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS maint_maintenance_files (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    maintenance_id INT UNSIGNED NOT NULL,
    original_name VARCHAR(500) NOT NULL,
    stored_name VARCHAR(500) NOT NULL,
    mime_type VARCHAR(100) NULL,
    size INT UNSIGNED NULL,
    uploaded_by INT UNSIGNED NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    KEY idx_mmf_maintenance (maintenance_id),
    CONSTRAINT fk_mmf_maintenance FOREIGN KEY (maintenance_id)
        REFERENCES maint_maintenances (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS maint_interventions (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    maintenance_id INT UNSIGNED NOT NULL,
    -- denormalised so the equipment history is a single-table scan
    equipment_id INT NOT NULL,
    performed_at DATE NOT NULL,
    status VARCHAR(20) NOT NULL DEFAULT 'completed',
    result VARCHAR(20) NULL,
    notes TEXT NULL,
    materials TEXT NULL,
    operator_employee_id INT UNSIGNED NULL,
    -- free text operator for external technicians not present in employees
    operator_name VARCHAR(191) NULL,
    signature_path VARCHAR(255) NULL,
    supplier_id INT NULL,
    created_by INT UNSIGNED NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    KEY idx_int_maintenance (maintenance_id, performed_at),
    KEY idx_int_equipment (equipment_id, performed_at),
    KEY idx_int_status (status),
    CONSTRAINT fk_int_maintenance FOREIGN KEY (maintenance_id)
        REFERENCES maint_maintenances (id) ON DELETE CASCADE,
    CONSTRAINT fk_int_equipment FOREIGN KEY (equipment_id)
        REFERENCES inv_equipment (id) ON DELETE CASCADE,
    CONSTRAINT fk_int_operator FOREIGN KEY (operator_employee_id)
        REFERENCES employees (id) ON DELETE SET NULL,
    CONSTRAINT fk_int_supplier FOREIGN KEY (supplier_id)
        REFERENCES suppliers (idsupplier) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS maint_intervention_files (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    intervention_id INT UNSIGNED NOT NULL,
    original_name VARCHAR(500) NOT NULL,
    stored_name VARCHAR(500) NOT NULL,
    mime_type VARCHAR(100) NULL,
    size INT UNSIGNED NULL,
    uploaded_by INT UNSIGNED NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    KEY idx_mif_intervention (intervention_id),
    CONSTRAINT fk_mif_intervention FOREIGN KEY (intervention_id)
        REFERENCES maint_interventions (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS maint_histories (
    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    equipment_id INT NULL,
    maintenance_id INT UNSIGNED NULL,
    intervention_id INT UNSIGNED NULL,
    user_id INT UNSIGNED NULL,
    action VARCHAR(50) NOT NULL,
    changes TEXT NULL,
    notes TEXT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    KEY idx_hist_equipment (equipment_id, created_at),
    KEY idx_hist_maintenance (maintenance_id, created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS maint_notifications (
    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    maintenance_id INT UNSIGNED NOT NULL,
    employee_id INT UNSIGNED NULL,
    email VARCHAR(191) NOT NULL,
    type VARCHAR(20) NOT NULL,
    sent_date DATE NOT NULL,
    sent_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY uniq_maint_notif (maintenance_id, email, type, sent_date),
    CONSTRAINT fk_notif_maintenance FOREIGN KEY (maintenance_id)
        REFERENCES maint_maintenances (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

INSERT IGNORE INTO ws_lookup_options (category, value, label, sort_order, is_default, is_active) VALUES
('maint_status', 'planned',      'Pianificato',   10, 0, 1),
('maint_status', 'in_progress',  'In corso',      20, 0, 1),
('maint_status', 'completed',    'Completato',    30, 1, 1),

('maint_result', 'compliant',    'Conforme',      10, 1, 1),
('maint_result', 'not_compliant','Non conforme',  20, 0, 1),
('maint_result', 'blocked',      'Bloccato',      30, 0, 1),
('maint_result', 'partial',      'Parziale',      40, 0, 1),

('equipment_status', 'active',          'Attivo',           10, 1, 1),
('equipment_status', 'out_of_service',  'Fuori servizio',   20, 0, 1),
('equipment_status', 'decommissioned',  'Dismesso',         30, 0, 1);