-- =============================================================================
-- 洗车记录系统 - Migration 0001: 基础表 (MySQL 8.x)
-- =============================================================================

-- -----------------------------------------------------------------------------
-- 1. chemicals - 药剂字典（Grocy 缓存层）
-- -----------------------------------------------------------------------------
CREATE TABLE IF NOT EXISTS chemicals (
    grocy_product_id  VARCHAR(255)  NOT NULL,
    name              VARCHAR(255)  NOT NULL,
    category          VARCHAR(255)  DEFAULT NULL,
    unit              VARCHAR(50)   NOT NULL DEFAULT 'ml',
    standard_dose     DOUBLE        DEFAULT NULL,
    notes             TEXT          DEFAULT NULL,
    is_active         TINYINT(1)   NOT NULL DEFAULT 1,
    fetched_at        DATETIME      DEFAULT NULL,
    created_at        DATETIME      NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at        DATETIME      NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (grocy_product_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE INDEX idx_chemicals_category ON chemicals(category);
CREATE INDEX idx_chemicals_active   ON chemicals(is_active);
CREATE INDEX idx_chemicals_fetched  ON chemicals(fetched_at);

-- -----------------------------------------------------------------------------
-- 2. weather_snapshots - 天气快照
-- -----------------------------------------------------------------------------
CREATE TABLE IF NOT EXISTS weather_snapshots (
    id              INT AUTO_INCREMENT PRIMARY KEY,
    snapshot_date   VARCHAR(10)     NOT NULL,
    city            VARCHAR(100)    NOT NULL,
    provider        VARCHAR(50)     NOT NULL,
    temp_c          DOUBLE          DEFAULT NULL,
    humidity        INT             DEFAULT NULL,
    weather_desc    VARCHAR(255)    DEFAULT NULL,
    weather_code    VARCHAR(20)     DEFAULT NULL,
    wind_kph        DOUBLE          DEFAULT NULL,
    precip_mm       DOUBLE          DEFAULT NULL,
    raw_json        TEXT            DEFAULT NULL,
    fetched_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE UNIQUE INDEX uk_weather_city_date ON weather_snapshots(city, snapshot_date);
CREATE INDEX idx_weather_date ON weather_snapshots(snapshot_date);

-- -----------------------------------------------------------------------------
-- 3. wash_records - 洗车记录
-- -----------------------------------------------------------------------------
CREATE TABLE IF NOT EXISTS wash_records (
    id                  INT AUTO_INCREMENT PRIMARY KEY,
    wash_date           VARCHAR(10)     NOT NULL,
    wash_type           VARCHAR(20)     NOT NULL,
    weather_snapshot_id INT             DEFAULT NULL,
    location            VARCHAR(255)    DEFAULT NULL,
    cost                DOUBLE          NOT NULL DEFAULT 0,
    duration_min        INT             DEFAULT NULL,
    notes               TEXT            DEFAULT NULL,
    created_at          DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at          DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    CONSTRAINT chk_wash_type CHECK (wash_type IN ('quick','full','detail','other')),
    CONSTRAINT fk_wash_weather FOREIGN KEY (weather_snapshot_id) REFERENCES weather_snapshots(id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE INDEX idx_wash_records_date ON wash_records(wash_date);
CREATE INDEX idx_wash_records_type ON wash_records(wash_type);
CREATE INDEX idx_wash_records_weather ON wash_records(weather_snapshot_id);

-- -----------------------------------------------------------------------------
-- 4. chemical_usage - 药剂消耗
-- -----------------------------------------------------------------------------
CREATE TABLE IF NOT EXISTS chemical_usage (
    id              INT AUTO_INCREMENT PRIMARY KEY,
    usage_date      VARCHAR(10)     NOT NULL,
    chemical_id     VARCHAR(255)    NOT NULL,
    amount          DOUBLE          NOT NULL,
    wash_record_id  INT             DEFAULT NULL,
    notes           TEXT            DEFAULT NULL,
    sync_status     VARCHAR(20)     NOT NULL DEFAULT 'pending',
    sync_at         DATETIME        DEFAULT NULL,
    created_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    CONSTRAINT chk_sync_status CHECK (sync_status IN ('pending','synced','failed')),
    CONSTRAINT fk_usage_chemical FOREIGN KEY (chemical_id) REFERENCES chemicals(grocy_product_id) ON DELETE RESTRICT,
    CONSTRAINT fk_usage_wash FOREIGN KEY (wash_record_id) REFERENCES wash_records(id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE INDEX idx_usage_date     ON chemical_usage(usage_date);
CREATE INDEX idx_usage_chemical ON chemical_usage(chemical_id);
CREATE INDEX idx_usage_wash     ON chemical_usage(wash_record_id);
CREATE INDEX idx_usage_sync     ON chemical_usage(sync_status);

-- -----------------------------------------------------------------------------
-- 5. settings - 运行时配置 KV
-- -----------------------------------------------------------------------------
CREATE TABLE IF NOT EXISTS settings (
    `key`       VARCHAR(100)    NOT NULL PRIMARY KEY,
    value       TEXT            DEFAULT NULL,
    is_secret   TINYINT(1)     NOT NULL DEFAULT 0,
    description TEXT            DEFAULT NULL,
    updated_at  DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

INSERT IGNORE INTO settings (`key`, value, is_secret, description) VALUES
    ('app_city',               NULL, 0, '所在城市（用于天气查询）'),
    ('app_timezone',           'Asia/Shanghai', 0, '时区'),
    ('grocy_url',              NULL, 0, 'Grocy 实例 URL'),
    ('grocy_api_token',        NULL, 1, 'Grocy REST API token'),
    ('backup_keep_count',      '10', 0, '本地备份保留份数'),
    ('backup_dir',             'storage/backups', 0, '备份输出目录');

-- -----------------------------------------------------------------------------
-- 6. views
-- -----------------------------------------------------------------------------
DROP VIEW IF EXISTS v_wash_monthly_count;
CREATE VIEW v_wash_monthly_count AS
SELECT
    SUBSTRING(wash_date, 1, 7) AS month,
    COUNT(*)                    AS wash_count,
    SUM(COALESCE(cost, 0))     AS total_cost
FROM wash_records
GROUP BY SUBSTRING(wash_date, 1, 7)
ORDER BY month DESC;

DROP VIEW IF EXISTS v_chemical_monthly_usage;
CREATE VIEW v_chemical_monthly_usage AS
SELECT
    SUBSTRING(cu.usage_date, 1, 7) AS month,
    c.grocy_product_id               AS grocy_product_id,
    c.name                          AS chemical_name,
    c.unit                          AS unit,
    SUM(cu.amount)                  AS total_amount,
    COUNT(*)                        AS usage_count
FROM chemical_usage cu
JOIN chemicals c ON c.grocy_product_id = cu.chemical_id
GROUP BY SUBSTRING(cu.usage_date, 1, 7), c.grocy_product_id
ORDER BY month DESC, total_amount DESC;

DROP VIEW IF EXISTS v_last_wash;
CREATE VIEW v_last_wash AS
SELECT
    id              AS wash_id,
    wash_date,
    wash_type,
    DATEDIFF(NOW(), STR_TO_DATE(wash_date, '%Y-%m-%d')) AS days_since
FROM wash_records
ORDER BY wash_date DESC, id DESC
LIMIT 1;