-- Generic, extensible "archive kind" (档案模式) framework.
-- Instead of a dedicated detail table per domain (food/electronics/drug/...),
-- each category belongs to an archive_kind, and a metadata table (kind_field)
-- describes the editable spec fields for that kind. Non-food spec values live
-- in the existing product.attributes JSONB. Adding a new domain later (drug,
-- machinery, ...) is just: seed kind_field rows + a category subtree.

ALTER TABLE category ADD COLUMN archive_kind VARCHAR(24) NOT NULL DEFAULT 'generic';

-- The existing seeded tree is the food domain.
UPDATE category SET archive_kind = 'food' WHERE path <@ 'food';

-- Field template per archive kind: drives the dynamic admin form and the
-- kind-aware completeness/qualified computation.
CREATE TABLE kind_field (
    kind        VARCHAR(24) NOT NULL,
    field_key   VARCHAR(64) NOT NULL,
    group_label TEXT NOT NULL DEFAULT '',
    label_zh    TEXT NOT NULL,
    field_type  VARCHAR(16) NOT NULL DEFAULT 'text',
    unit        TEXT,
    options     TEXT[] NOT NULL DEFAULT '{}',
    placeholder TEXT,
    sort_order  INT NOT NULL DEFAULT 0,
    qualified   BOOLEAN NOT NULL DEFAULT false,
    PRIMARY KEY (kind, field_key),
    CONSTRAINT kind_field_type_chk CHECK (field_type IN ('text','number','textarea','select','list'))
);

-- Seed the electronics (3C) field template.
INSERT INTO kind_field (kind, field_key, group_label, label_zh, field_type, unit, sort_order, qualified) VALUES
('electronics','model_number',   '基础规格','型号',        'text',   NULL,  10, true),
('electronics','ccc_cert',       '基础规格','3C认证号(CCC)','text',  NULL,  20, true),
('electronics','color',          '基础规格','颜色',        'text',   NULL,  30, false),
('electronics','release_year',   '基础规格','发布年份',    'number', NULL,  40, false),
('electronics','warranty_months','基础规格','保修期',      'number', '月',  50, false),
('electronics','dimensions',     '外形','尺寸(长x宽x高)',  'text',   'mm',  60, false),
('electronics','weight',         '外形','重量',            'number', 'g',   70, false),
('electronics','power',          '外形','电源/功率',       'text',   NULL,  80, false),
('electronics','os',             '关键参数','操作系统',    'text',   NULL,  90, false),
('electronics','cpu',            '关键参数','处理器',      'text',   NULL, 100, false),
('electronics','ram',            '关键参数','内存',        'text',   NULL, 110, false),
('electronics','storage',        '关键参数','存储',        'text',   NULL, 120, false),
('electronics','screen_size',    '关键参数','屏幕尺寸',    'text',   NULL, 130, true),
('electronics','battery',        '关键参数','电池容量',    'text',   NULL, 140, false),
('electronics','ports',          '关键参数','接口',        'text',   NULL, 150, false);

-- Seed the 3C category tree.
INSERT INTO category (name_zh, name_en, parent_id, path, level, archive_kind)
VALUES ('电子数码', 'Electronics', NULL, 'electronics', 0, 'electronics');

INSERT INTO category (name_zh, name_en, parent_id, path, level, archive_kind)
SELECT v.name_zh, v.name_en, c.id, v.path::ltree, 1, 'electronics'
FROM (VALUES
    ('手机',     'Smartphone',     'electronics.phone'),
    ('笔记本电脑', 'Laptop',        'electronics.laptop'),
    ('平板电脑',  'Tablet',         'electronics.tablet'),
    ('智能手表',  'Smartwatch',     'electronics.watch'),
    ('耳机',     'Headphone',      'electronics.headphone'),
    ('相机',     'Camera',         'electronics.camera'),
    ('电视',     'TV',             'electronics.tv'),
    ('家用电器',  'Home appliance', 'electronics.appliance')
) AS v(name_zh, name_en, path)
JOIN category c ON c.path = 'electronics';