/* =======================================================================
   Email Template System — Schema passend zur api.php (2025-09-06)
   Charset: utf8mb4  |  Engine: InnoDB
   Hinweis:
   - Mandantenfähigkeit über customer_id (alle Haupttabellen + Items + Assets).
   - Contentspalten: Templates/Sections/Blocks = `html`, Snippets = `content`.
   - Referenzen: template_items (Section/Block) & section_items (Block).
   ======================================================================= */

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

/* Drop-Reihenfolge: erst Items, dann Master-Tabellen */
DROP TABLE IF EXISTS `emailtemplate_section_items`;
DROP TABLE IF EXISTS `emailtemplate_template_items`;
DROP TABLE IF EXISTS `emailtemplate_assets`;
DROP TABLE IF EXISTS `emailtemplate_snippets`;
DROP TABLE IF EXISTS `emailtemplate_blocks`;
DROP TABLE IF EXISTS `emailtemplate_sections`;
DROP TABLE IF EXISTS `emailtemplate_templates`;
/*DROP TABLE IF EXISTS `customers`;          -- optional (nur falls lokal hier gepflegt) */
/*DROP TABLE IF EXISTS `customer_users`;     -- optional */

SET FOREIGN_KEY_CHECKS = 1;

/* =========================
   Master-Tabellen
   ========================= */

/* 1) Templates (oberste Ebene) */
CREATE TABLE `emailtemplate_templates` (
  `id`             INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `customer_id`    INT UNSIGNED NOT NULL,
  `name`           VARCHAR(255) NOT NULL,
  `json_content`   MEDIUMTEXT NULL,                      -- NEU: Speichert GrapesJS JSON-Zustand (Komponenten + Stile)
  `html`           MEDIUMTEXT NULL,                      -- BLEIBT: Speichert finalen, exportierten HTML-Code
  `created_at`     TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at`     TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_tpl_customer` (`customer_id`),
  KEY `idx_tpl_updated` (`updated_at`),
  KEY `idx_tpl_name` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

/* 2) Sections (optional einem Template zugeordnet) */
CREATE TABLE `emailtemplate_sections` (
  `id`             INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `customer_id`    INT UNSIGNED NOT NULL,
  `template_id`    INT UNSIGNED NULL,
  `name`           VARCHAR(255) NOT NULL,
  `type`           VARCHAR(50)  NOT NULL DEFAULT 'html',
  `json_content`   MEDIUMTEXT NULL,                      -- NEU: Speichert GrapesJS JSON-Zustand (Komponenten + Stile)
  `z_index`        INT NOT NULL DEFAULT 0,
  `html`           MEDIUMTEXT NULL,                      -- BLEIBT: Speichert finalen, exportierten HTML-Code
  `created_at`     TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at`     TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_sec_customer` (`customer_id`),
  KEY `idx_sec_template` (`template_id`),
  KEY `idx_sec_sort` (`template_id`,`z_index`,`id`),
  CONSTRAINT `fk_sections_template`
    FOREIGN KEY (`template_id`) REFERENCES `emailtemplate_templates` (`id`)
    ON UPDATE CASCADE ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

/* 3) Blocks (optional einer Section zugeordnet) */
CREATE TABLE `emailtemplate_blocks` (
  `id`             INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `customer_id`    INT UNSIGNED NOT NULL,
  `section_id`     INT UNSIGNED NULL,
  `name`           VARCHAR(255) NOT NULL,
  `category`       VARCHAR(100) NOT NULL DEFAULT 'Default',
  `json_content`   MEDIUMTEXT NULL,                      -- NEU: Speichert GrapesJS JSON-Zustand (Komponenten + Stile)
  `html`           MEDIUMTEXT NULL,                      -- BLEIBT: Speichert finalen, exportierten HTML-Code
  `created_at`     TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at`     TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_blk_customer` (`customer_id`),
  KEY `idx_blk_section`  (`section_id`),
  KEY `idx_blk_name`     (`name`),
  CONSTRAINT `fk_blocks_section`
    FOREIGN KEY (`section_id`) REFERENCES `emailtemplate_sections` (`id`)
    ON UPDATE CASCADE ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

/* 4) Snippets (kleine Bausteine; BY VALUE) */
CREATE TABLE `emailtemplate_snippets` (
  `id`             INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `customer_id`    INT UNSIGNED NOT NULL,
  `name`           VARCHAR(255) NOT NULL,
  `category`       VARCHAR(100) NOT NULL DEFAULT '',
  `json_content`   MEDIUMTEXT NULL,                      -- NEU: Speichert GrapesJS JSON-Zustand
  `content`        MEDIUMTEXT NULL,                      -- BLEIBT: Speichert finalen, exportierten HTML-Code
  `block_id`       INT UNSIGNED NULL,
  `created_at`     TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at`     TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_snp_customer` (`customer_id`),
  KEY `idx_snp_name`     (`name`),
  KEY `idx_snp_block`    (`block_id`),
  CONSTRAINT `fk_snippets_block`
    FOREIGN KEY (`block_id`) REFERENCES `emailtemplate_blocks` (`id`)
    ON UPDATE CASCADE ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
/* 5) Assets (READ-only in api.php) */
CREATE TABLE `emailtemplate_assets` (
  `id`           INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `customer_id`  INT UNSIGNED NOT NULL,
  `name`         VARCHAR(255) NOT NULL,
  `type`         VARCHAR(50)  NOT NULL,
  `mime_type`    VARCHAR(100) NOT NULL,
  `size_bytes`   INT UNSIGNED NOT NULL DEFAULT 0,
  `public_url`   VARCHAR(1000) NULL,
  `created_at`   TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at`   TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_ast_customer` (`customer_id`),
  KEY `idx_ast_updated`  (`updated_at`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

/* =========================
   Referenz-Item-Tabellen
   ========================= */

/* 6) Items im Template (Sections ODER Blocks als Referenz) */
CREATE TABLE `emailtemplate_template_items` (
  `id`              INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `customer_id`     INT UNSIGNED NOT NULL,
  `template_id`     INT UNSIGNED NOT NULL,
  `sort`            INT NOT NULL DEFAULT 0,
  `ref_type`        ENUM('section','block') NOT NULL,
  `ref_id`          INT UNSIGNED NOT NULL,
  `overrides_json`  JSON NULL,
  `lock_to_version` INT NULL,
  `created_at`      TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at`      TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_titems_template_sort` (`template_id`,`sort`),
  KEY `idx_titems_customer` (`customer_id`),
  KEY `idx_titems_ref` (`ref_type`,`ref_id`),
  CONSTRAINT `fk_titems_template`
    FOREIGN KEY (`template_id`) REFERENCES `emailtemplate_templates` (`id`)
    ON UPDATE CASCADE ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

/* 7) Items in einer Section (NUR Blocks als Referenz) */
CREATE TABLE `emailtemplate_section_items` (
  `id`              INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `customer_id`     INT UNSIGNED NOT NULL,
  `section_id`      INT UNSIGNED NOT NULL,
  `sort`            INT NOT NULL DEFAULT 0,
  `ref_type`        ENUM('block') NOT NULL,
  `ref_id`          INT UNSIGNED NOT NULL,
  `overrides_json`  JSON NULL,
  `lock_to_version` INT NULL,
  `created_at`      TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at`      TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_sitems_section_sort` (`section_id`,`sort`),
  KEY `idx_sitems_customer` (`customer_id`),
  KEY `idx_sitems_ref` (`ref_type`,`ref_id`),
  CONSTRAINT `fk_sitems_section`
    FOREIGN KEY (`section_id`) REFERENCES `emailtemplate_sections` (`id`)
    ON UPDATE CASCADE ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

/* =========================
   Optionale Seed-Daten
   ========================= */
-- INSERT INTO `emailtemplate_templates` (`customer_id`,`name`,`html`) VALUES (1,'Newsletter-Template','');
-- INSERT INTO `emailtemplate_sections`  (`customer_id`,`name`,`type`,`z_index`,`html`,`template_id`) VALUES (1,'Hero','html',10,'<table role="presentation" width="100%"><tr><td>{{children}}</td></tr></table>', NULL);
-- INSERT INTO `emailtemplate_blocks`    (`customer_id`,`name`,`category`,`html`,`section_id`) VALUES (1,'CTA-Block','CTA','<table role="presentation"><tr><td>...</td></tr></table>', NULL);
-- INSERT INTO `emailtemplate_snippets`  (`customer_id`,`name`,`category`,`content`) VALUES (1,'Textabsatz','Text','<p style="margin:0 0 12px 0;">Lorem ipsum…</p>');

-- FK-Prüfung (falls temporär deaktiviert) wieder aktivieren
SET FOREIGN_KEY_CHECKS = 1;