-- 平台共享媒体资源与统一账务升级脚本，可重复执行。

CREATE TABLE IF NOT EXISTS platform_resource_pool (
    id              BIGINT PRIMARY KEY COMMENT '主键 ID',
    total_bytes     BIGINT NOT NULL DEFAULT 0 COMMENT '累计采购资源（字节）',
    available_bytes BIGINT NOT NULL DEFAULT 0 COMMENT '可用共享资源（字节）',
    consumed_bytes  BIGINT NOT NULL DEFAULT 0 COMMENT '已消费共享资源（字节）',
    status          VARCHAR(16) NOT NULL DEFAULT 'active' COMMENT '资源池状态',
    version         BIGINT NOT NULL DEFAULT 0 COMMENT '乐观版本号',
    created_at      DATETIME COMMENT '创建时间',
    updated_at      DATETIME COMMENT '更新时间'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS platform_resource_purchase (
    id              BIGINT PRIMARY KEY COMMENT '主键 ID',
    batch_no        VARCHAR(64) NOT NULL COMMENT '采购批次号',
    provider        VARCHAR(32) NOT NULL COMMENT '资源供应商',
    total_bytes     BIGINT NOT NULL COMMENT '采购资源量（字节）',
    unit_cost       DECIMAL(12,6) COMMENT '单位成本（元/字节）',
    total_cost      DECIMAL(14,2) COMMENT '采购总成本（元）',
    expires_at      DATETIME COMMENT '资源到期时间',
    status          VARCHAR(16) NOT NULL DEFAULT 'active' COMMENT '批次状态',
    remark          VARCHAR(256) COMMENT '备注',
    created_by      BIGINT NOT NULL COMMENT '操作人 ID',
    created_at      DATETIME COMMENT '创建时间',
    updated_at      DATETIME COMMENT '更新时间',
    UNIQUE KEY uk_resource_purchase_batch (batch_no)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS traffic_package (
    id              BIGINT PRIMARY KEY COMMENT '主键 ID',
    code            VARCHAR(64) NOT NULL COMMENT '套餐编码',
    name            VARCHAR(128) NOT NULL COMMENT '套餐名称',
    amount_bytes    BIGINT NOT NULL COMMENT '套餐额度（字节）',
    price           DECIMAL(10,2) NOT NULL COMMENT '销售价格（元）',
    validity_days   INT COMMENT '有效期（天）',
    status          VARCHAR(16) NOT NULL DEFAULT 'active' COMMENT '套餐状态',
    sort            INT NOT NULL DEFAULT 0 COMMENT '显示排序',
    created_at      DATETIME COMMENT '创建时间',
    updated_at      DATETIME COMMENT '更新时间',
    UNIQUE KEY uk_traffic_package_code (code)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS traffic_ledger (
    id              BIGINT PRIMARY KEY COMMENT '主键 ID',
    account_type    VARCHAR(16) NOT NULL COMMENT '账户类型', -- user / platform
    account_id      BIGINT NOT NULL COMMENT '账户 ID',
    direction       VARCHAR(8) NOT NULL COMMENT '借贷方向', -- credit / debit
    amount_bytes    BIGINT NOT NULL COMMENT '变动金额（字节）',
    balance_before  BIGINT NOT NULL COMMENT '变动前余额（字节）',
    balance_after   BIGINT NOT NULL COMMENT '变动后余额（字节）',
    source_type     VARCHAR(32) NOT NULL COMMENT '业务来源类型',
    source_id       VARCHAR(128) COMMENT '业务来源 ID',
    idempotency_key VARCHAR(128) NOT NULL COMMENT '全局幂等键',
    operator_id     BIGINT COMMENT '操作人 ID',
    remark          VARCHAR(256) COMMENT '备注',
    created_at      DATETIME COMMENT '创建时间',
    UNIQUE KEY uk_traffic_ledger_idempotency (idempotency_key),
    KEY idx_traffic_ledger_account (account_type, account_id, created_at),
    KEY idx_traffic_ledger_source (source_type, source_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS live_billing_segment (
    id              BIGINT PRIMARY KEY COMMENT '主键 ID',
    session_id      VARCHAR(128) NOT NULL COMMENT '直播会话 ID',
    user_id         BIGINT NOT NULL COMMENT '扣费用户 ID',
    period_start    DATETIME NOT NULL COMMENT '计费开始时间',
    period_end      DATETIME NOT NULL COMMENT '计费结束时间',
    bytes           BIGINT NOT NULL COMMENT '计费流量（字节）',
    status          VARCHAR(16) NOT NULL DEFAULT 'pending' COMMENT '结算状态',
    idempotency_key VARCHAR(160) NOT NULL COMMENT '结算幂等键',
    created_at      DATETIME COMMENT '创建时间',
    settled_at      DATETIME COMMENT '结算时间',
    UNIQUE KEY uk_live_billing_segment_period (session_id, period_start, period_end),
    UNIQUE KEY uk_live_billing_segment_idempotency (idempotency_key),
    KEY idx_live_billing_segment_session (session_id, period_start)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 已部署数据库的新增字段；字段存在时跳过，避免重复执行失败。
DELIMITER $$
DROP PROCEDURE IF EXISTS upgrade_platform_traffic_billing $$
CREATE PROCEDURE upgrade_platform_traffic_billing()
BEGIN
    DECLARE item_count INT DEFAULT 0;

    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'traffic_order' AND column_name = 'package_id';
    IF item_count = 0 THEN ALTER TABLE traffic_order ADD COLUMN package_id BIGINT NULL COMMENT '套餐 ID' AFTER user_id; END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'traffic_order' AND column_name = 'package_code';
    IF item_count = 0 THEN ALTER TABLE traffic_order ADD COLUMN package_code VARCHAR(64) NULL COMMENT '套餐编码快照' AFTER package_id; END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'traffic_order' AND column_name = 'amount_bytes';
    IF item_count = 0 THEN ALTER TABLE traffic_order ADD COLUMN amount_bytes BIGINT NOT NULL DEFAULT 0 COMMENT '流量额度（字节）' AFTER amount_gb; END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'traffic_order' AND column_name = 'credit_status';
    IF item_count = 0 THEN ALTER TABLE traffic_order ADD COLUMN credit_status VARCHAR(16) NOT NULL DEFAULT 'pending' COMMENT '充值入账状态' AFTER pay_status; END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'traffic_order' AND column_name = 'credit_ledger_id';
    IF item_count = 0 THEN ALTER TABLE traffic_order ADD COLUMN credit_ledger_id BIGINT NULL COMMENT '充值流水 ID' AFTER credit_status; END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'traffic_order' AND column_name = 'payment_idempotency_key';
    IF item_count = 0 THEN ALTER TABLE traffic_order ADD COLUMN payment_idempotency_key VARCHAR(128) NULL COMMENT '支付幂等键' AFTER credit_ledger_id; END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'traffic_order' AND column_name = 'paid_by';
    IF item_count = 0 THEN ALTER TABLE traffic_order ADD COLUMN paid_by BIGINT NULL COMMENT '确认支付的操作人 ID' AFTER payment_idempotency_key; END IF;

    SELECT COUNT(*) INTO item_count FROM information_schema.statistics WHERE table_schema = DATABASE() AND table_name = 'traffic_order' AND index_name = 'uk_traffic_order_payment_idem';
    IF item_count = 0 THEN CREATE UNIQUE INDEX uk_traffic_order_payment_idem ON traffic_order (payment_idempotency_key); END IF;

    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'download_log' AND column_name = 'idempotency_key';
    IF item_count = 0 THEN
        ALTER TABLE download_log ADD COLUMN idempotency_key VARCHAR(128) NULL COMMENT '下载计费幂等键';
        UPDATE download_log SET idempotency_key = CONCAT('legacy:', id) WHERE idempotency_key IS NULL;
        ALTER TABLE download_log MODIFY COLUMN idempotency_key VARCHAR(128) NOT NULL COMMENT '下载计费幂等键';
    END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.statistics WHERE table_schema = DATABASE() AND table_name = 'download_log' AND index_name = 'uk_download_log_idempotency';
    IF item_count = 0 THEN CREATE UNIQUE INDEX uk_download_log_idempotency ON download_log (idempotency_key); END IF;

    SELECT COUNT(*) INTO item_count FROM information_schema.columns WHERE table_schema = DATABASE() AND table_name = 'traffic_usage_log' AND column_name = 'idempotency_key';
    IF item_count = 0 THEN
        ALTER TABLE traffic_usage_log ADD COLUMN idempotency_key VARCHAR(160) NULL COMMENT '消费幂等键' AFTER balance_after;
        UPDATE traffic_usage_log SET idempotency_key = CONCAT('legacy:', id) WHERE idempotency_key IS NULL;
        ALTER TABLE traffic_usage_log MODIFY COLUMN idempotency_key VARCHAR(160) NOT NULL COMMENT '消费幂等键';
    END IF;
    SELECT COUNT(*) INTO item_count FROM information_schema.statistics WHERE table_schema = DATABASE() AND table_name = 'traffic_usage_log' AND index_name = 'uk_traffic_usage_idempotency';
    IF item_count = 0 THEN CREATE UNIQUE INDEX uk_traffic_usage_idempotency ON traffic_usage_log (idempotency_key); END IF;
END $$
CALL upgrade_platform_traffic_billing() $$
DROP PROCEDURE upgrade_platform_traffic_billing $$
DELIMITER ;