-- ============================================
-- 修复车辆ID映射关系
-- 解决QAUP-Management和CollisionAvoidanceSystem之间的车辆标识符不一致问题
-- 创建时间: 2025-01-15
-- ============================================

-- ============================================
-- 方案一：优化表结构（推荐）
-- 在vehicle_locations表中添加license_plate字段，保持vehicle_id作为车牌号
-- ============================================

-- 1. 为vehicle_locations表添加license_plate字段（明确语义）
ALTER TABLE vehicle_locations ADD COLUMN IF NOT EXISTS license_plate VARCHAR(50);

-- 2. 将现有的vehicle_id数据复制到license_plate字段
UPDATE vehicle_locations SET license_plate = vehicle_id WHERE license_plate IS NULL;

-- 3. 添加索引优化查询性能
CREATE INDEX IF NOT EXISTS idx_vehicle_locations_license_plate ON vehicle_locations(license_plate);

-- 4. 为vehicle_locations表添加数字车辆ID字段（可选，用于外键关联）
ALTER TABLE vehicle_locations ADD COLUMN IF NOT EXISTS sys_vehicle_id BIGINT;

-- 5. 添加外键约束（可选，确保数据完整性）
-- 注意：只有在sys_vehicle_info表中存在对应车牌号的记录时，此约束才会生效
-- ALTER TABLE vehicle_locations 
-- ADD CONSTRAINT fk_vehicle_locations_sys_vehicle_id 
-- FOREIGN KEY (sys_vehicle_id) REFERENCES sys_vehicle_info(vehicle_id);

-- 6. 同样处理vehicle_trajectories表
ALTER TABLE vehicle_trajectories ADD COLUMN IF NOT EXISTS license_plate VARCHAR(50);
UPDATE vehicle_trajectories SET license_plate = vehicle_id WHERE license_plate IS NULL;
CREATE INDEX IF NOT EXISTS idx_vehicle_trajectories_license_plate ON vehicle_trajectories(license_plate);
ALTER TABLE vehicle_trajectories ADD COLUMN IF NOT EXISTS sys_vehicle_id BIGINT;

-- 7. 处理vehicle_commands表
ALTER TABLE vehicle_commands ADD COLUMN IF NOT EXISTS license_plate VARCHAR(50);
UPDATE vehicle_commands SET license_plate = vehicle_id WHERE license_plate IS NULL;
CREATE INDEX IF NOT EXISTS idx_vehicle_commands_license_plate ON vehicle_commands(license_plate);
ALTER TABLE vehicle_commands ADD COLUMN IF NOT EXISTS sys_vehicle_id BIGINT;

-- 8. 处理rule_violation_events表
ALTER TABLE rule_violation_events ADD COLUMN IF NOT EXISTS license_plate VARCHAR(50);
UPDATE rule_violation_events SET license_plate = subject_id WHERE license_plate IS NULL AND subject_type = 'VEHICLE';
CREATE INDEX IF NOT EXISTS idx_rule_violations_license_plate ON rule_violation_events(license_plate);
ALTER TABLE rule_violation_events ADD COLUMN IF NOT EXISTS sys_vehicle_id BIGINT;

-- ============================================
-- 更新业务视图 - 使用正确的关联字段
-- ============================================

-- 删除旧的视图
DROP VIEW IF EXISTS vehicle_complete_info;
DROP VIEW IF EXISTS vehicle_status_summary;

-- 重新创建车辆完整信息视图（修正关联逻辑）
CREATE OR REPLACE VIEW vehicle_complete_info AS
SELECT 
    vi.vehicle_id as sys_vehicle_id,
    vi.license_plate_number,
    vi.vin_number,
    vi.type_id,
    vt.type_name,
    vi.brand,
    vi.owning_unit,
    vi.contact_person,
    vi.phone_number,
    vi.image_url,
    vl.location,
    vl.altitude,
    vl.heading,
    vl.speed,
    vl.timestamp as last_location_time,
    vl.data_quality,
    vi.create_time,
    vi.update_time
FROM sys_vehicle_info vi
LEFT JOIN sys_vehicle_type vt ON vi.type_id = vt.type_id
LEFT JOIN LATERAL (
    SELECT * FROM vehicle_locations 
    WHERE license_plate = vi.license_plate_number 
    ORDER BY timestamp DESC 
    LIMIT 1
) vl ON true;

-- 重新创建车辆实时状态统计视图
CREATE OR REPLACE VIEW vehicle_status_summary AS
SELECT 
    vehicle_type,
    COUNT(*) as total_vehicles,
    COUNT(CASE WHEN timestamp > NOW() - INTERVAL '5 minutes' THEN 1 END) as active_vehicles,
    COUNT(CASE WHEN timestamp <= NOW() - INTERVAL '5 minutes' THEN 1 END) as inactive_vehicles,
    AVG(speed) as avg_speed,
    MAX(speed) as max_speed
FROM vehicle_locations vl
WHERE timestamp > NOW() - INTERVAL '24 hours'
GROUP BY vehicle_type;

-- ============================================
-- 创建车牌号关联的便捷视图
-- ============================================

-- 车辆基础信息与最新位置关联视图（通过车牌号）
CREATE OR REPLACE VIEW vehicle_info_with_location AS
SELECT 
    vi.vehicle_id as sys_vehicle_id,
    vi.license_plate_number as vehicle_plate,
    vi.brand,
    vi.owning_unit,
    vt.type_name as vehicle_type_name,
    vl.vehicle_type as location_vehicle_type,
    vl.location,
    ST_X(vl.location) as longitude,
    ST_Y(vl.location) as latitude,
    vl.altitude,
    vl.heading,
    vl.speed,
    vl.timestamp as last_update_time,
    CASE 
        WHEN vl.timestamp > NOW() - INTERVAL '5 minutes' THEN 'ACTIVE'
        WHEN vl.timestamp > NOW() - INTERVAL '30 minutes' THEN 'INACTIVE'
        ELSE 'OFFLINE'
    END as status
FROM sys_vehicle_info vi
LEFT JOIN sys_vehicle_type vt ON vi.type_id = vt.type_id
LEFT JOIN LATERAL (
    SELECT * FROM vehicle_locations 
    WHERE license_plate = vi.license_plate_number 
    ORDER BY timestamp DESC 
    LIMIT 1
) vl ON true;

-- 车辆轨迹查询视图（按车牌号）
CREATE OR REPLACE VIEW vehicle_trajectory_view AS
SELECT 
    vi.vehicle_id as sys_vehicle_id,
    vi.license_plate_number as vehicle_plate,
    vi.brand,
    vt.trajectory_date,
    vt.trajectory_line,
    vt.total_distance,
    vt.max_speed,
    vt.avg_speed,
    vt.duration_seconds,
    vt.start_time,
    vt.end_time
FROM sys_vehicle_info vi
INNER JOIN vehicle_trajectories vt ON vt.license_plate = vi.license_plate_number
LEFT JOIN sys_vehicle_type vtype ON vi.type_id = vtype.type_id;

-- ============================================
-- 创建数据同步函数
-- ============================================

-- 函数：根据车牌号更新sys_vehicle_id
CREATE OR REPLACE FUNCTION update_sys_vehicle_id()
RETURNS void AS $$
BEGIN
    -- 更新vehicle_locations表
    UPDATE vehicle_locations vl
    SET sys_vehicle_id = vi.vehicle_id
    FROM sys_vehicle_info vi
    WHERE vl.license_plate = vi.license_plate_number
    AND vl.sys_vehicle_id IS NULL;
    
    -- 更新vehicle_trajectories表
    UPDATE vehicle_trajectories vt
    SET sys_vehicle_id = vi.vehicle_id
    FROM sys_vehicle_info vi
    WHERE vt.license_plate = vi.license_plate_number
    AND vt.sys_vehicle_id IS NULL;
    
    -- 更新vehicle_commands表
    UPDATE vehicle_commands vc
    SET sys_vehicle_id = vi.vehicle_id
    FROM sys_vehicle_info vi
    WHERE vc.license_plate = vi.license_plate_number
    AND vc.sys_vehicle_id IS NULL;
    
    -- 更新rule_violation_events表
    UPDATE rule_violation_events rve
    SET sys_vehicle_id = vi.vehicle_id
    FROM sys_vehicle_info vi
    WHERE rve.license_plate = vi.license_plate_number
    AND rve.sys_vehicle_id IS NULL
    AND rve.subject_type = 'VEHICLE';
    
    RAISE NOTICE '车辆ID同步完成';
END;
$$ LANGUAGE plpgsql;

-- 执行一次数据同步
SELECT update_sys_vehicle_id();

-- ============================================
-- 添加注释说明
-- ============================================

COMMENT ON COLUMN vehicle_locations.license_plate IS '车牌号，对应sys_vehicle_info.license_plate_number';
COMMENT ON COLUMN vehicle_locations.sys_vehicle_id IS '系统车辆ID，对应sys_vehicle_info.vehicle_id';
COMMENT ON COLUMN vehicle_trajectories.license_plate IS '车牌号，对应sys_vehicle_info.license_plate_number';
COMMENT ON COLUMN vehicle_trajectories.sys_vehicle_id IS '系统车辆ID，对应sys_vehicle_info.vehicle_id';
COMMENT ON COLUMN vehicle_commands.license_plate IS '车牌号，对应sys_vehicle_info.license_plate_number';
COMMENT ON COLUMN vehicle_commands.sys_vehicle_id IS '系统车辆ID，对应sys_vehicle_info.vehicle_id';

COMMENT ON VIEW vehicle_complete_info IS '车辆完整信息视图，包含基础信息和最新位置，通过车牌号关联';
COMMENT ON VIEW vehicle_info_with_location IS '车辆信息与位置关联视图，提供完整的车辆状态';
COMMENT ON VIEW vehicle_trajectory_view IS '车辆轨迹视图，通过车牌号关联基础信息和轨迹数据';

-- ============================================
-- 验证脚本
-- ============================================

-- 检查表结构更新
SELECT column_name, data_type, is_nullable 
FROM information_schema.columns 
WHERE table_name IN ('vehicle_locations', 'vehicle_trajectories', 'vehicle_commands', 'rule_violation_events')
AND column_name IN ('license_plate', 'sys_vehicle_id')
ORDER BY table_name, column_name;

-- 检查视图创建
SELECT viewname, viewowner 
FROM pg_views 
WHERE viewname IN ('vehicle_complete_info', 'vehicle_status_summary', 'vehicle_info_with_location', 'vehicle_trajectory_view')
ORDER BY viewname;

-- 检查数据同步结果（示例查询）
SELECT 
    'vehicle_locations' as table_name,
    COUNT(*) as total_records,
    COUNT(license_plate) as has_license_plate,
    COUNT(sys_vehicle_id) as has_sys_vehicle_id
FROM vehicle_locations
UNION ALL
SELECT 
    'vehicle_trajectories' as table_name,
    COUNT(*) as total_records,
    COUNT(license_plate) as has_license_plate,
    COUNT(sys_vehicle_id) as has_sys_vehicle_id
FROM vehicle_trajectories;

-- ============================================
-- 完成提示
-- ============================================

DO $$
BEGIN
    RAISE NOTICE '==============================================';
    RAISE NOTICE '车辆ID映射关系修复完成！';
    RAISE NOTICE '主要改进：';
    RAISE NOTICE '1. 添加了license_plate字段明确语义';
    RAISE NOTICE '2. 添加了sys_vehicle_id字段支持数字ID关联';
    RAISE NOTICE '3. 更新了所有相关视图使用正确的关联逻辑';
    RAISE NOTICE '4. 创建了数据同步函数';
    RAISE NOTICE '建议：在应用代码中使用license_plate字段进行车辆关联';
    RAISE NOTICE '==============================================';
END $$;