-- ============================================
-- 数据模型统一重构修复脚本
-- 解决视图依赖问题，完成字段重命名
-- 创建时间：2025-01-15
-- ============================================

-- 开始事务
BEGIN;

-- 设置错误处理
\set ON_ERROR_STOP on

-- ============================================
-- 第一阶段：删除依赖的视图
-- ============================================

-- 删除所有依赖于vehicle_id字段的视图
DROP VIEW IF EXISTS vehicle_complete_info CASCADE;
DROP VIEW IF EXISTS vehicle_status_summary CASCADE;
DROP VIEW IF EXISTS vehicle_info_with_location CASCADE;
DROP VIEW IF EXISTS vehicle_trajectory_view CASCADE;

-- ============================================
-- 第二阶段：完成字段重命名和清理
-- ============================================

-- 1. 处理sys_vehicle_info表 - 重命名license_plate_number为license_plate
ALTER TABLE sys_vehicle_info RENAME COLUMN license_plate_number TO license_plate;

-- 2. 处理vehicle_locations表 - 删除旧字段，重命名新字段
ALTER TABLE vehicle_locations DROP COLUMN vehicle_id;
ALTER TABLE vehicle_locations RENAME COLUMN sys_vehicle_id TO vehicle_id;

-- 3. 处理vehicle_trajectories表 - 删除旧字段，重命名新字段
ALTER TABLE vehicle_trajectories DROP COLUMN vehicle_id;
ALTER TABLE vehicle_trajectories RENAME COLUMN sys_vehicle_id TO vehicle_id;

-- 4. 处理vehicle_commands表 - 删除旧字段，重命名新字段
ALTER TABLE vehicle_commands DROP COLUMN vehicle_id;
ALTER TABLE vehicle_commands RENAME COLUMN sys_vehicle_id TO vehicle_id;

-- 5. 处理rule_violation_events表 - 更新subject_id字段
-- 为subject_id字段添加新列，然后删除旧列
ALTER TABLE rule_violation_events ADD COLUMN IF NOT EXISTS subject_id_new VARCHAR(50);
-- 对于车辆类型的事件，使用sys_vehicle_id的值；对于其他类型，保持原值
UPDATE rule_violation_events SET subject_id_new = 
    CASE 
        WHEN subject_type = 'VEHICLE' AND sys_vehicle_id IS NOT NULL THEN sys_vehicle_id::VARCHAR
        ELSE subject_id
    END;
-- 删除旧列，重命名新列
ALTER TABLE rule_violation_events DROP COLUMN subject_id;
ALTER TABLE rule_violation_events RENAME COLUMN subject_id_new TO subject_id;

-- ============================================
-- 第三阶段：重建索引
-- ============================================

-- 重建vehicle_locations表的索引
CREATE INDEX IF NOT EXISTS idx_vehicle_locations_vehicle_id ON vehicle_locations(vehicle_id);
CREATE INDEX IF NOT EXISTS idx_vehicle_locations_license_plate ON vehicle_locations(license_plate);

-- 重建vehicle_trajectories表的索引
CREATE INDEX IF NOT EXISTS idx_vehicle_trajectories_vehicle_id ON vehicle_trajectories(vehicle_id);
CREATE INDEX IF NOT EXISTS idx_vehicle_trajectories_license_plate ON vehicle_trajectories(license_plate);

-- 重建vehicle_commands表的索引
CREATE INDEX IF NOT EXISTS idx_vehicle_commands_vehicle_id ON vehicle_commands(vehicle_id);
CREATE INDEX IF NOT EXISTS idx_vehicle_commands_license_plate ON vehicle_commands(license_plate);

-- 重建rule_violation_events表的索引
CREATE INDEX IF NOT EXISTS idx_rule_violations_license_plate ON rule_violation_events(license_plate) 
WHERE subject_type = 'VEHICLE';

-- ============================================
-- 第四阶段：重建业务视图
-- ============================================

-- 1. 重建vehicle_complete_info视图
CREATE OR REPLACE VIEW vehicle_complete_info AS
SELECT 
    vi.vehicle_id,
    vi.license_plate,
    vi.vin_number,
    vi.brand,
    vi.owning_unit,
    vi.contact_person,
    vi.phone_number,
    vl.location,
    vl.altitude,
    vl.heading,
    vl.speed,
    vl.timestamp as last_location_time,
    vl.data_quality,
    CASE 
        WHEN vl.timestamp > NOW() - INTERVAL '10 minutes' THEN 'ONLINE'
        WHEN vl.timestamp > NOW() - INTERVAL '1 hour' THEN 'RECENT'
        ELSE 'OFFLINE'
    END as connection_status
FROM sys_vehicle_info vi
LEFT JOIN LATERAL (
    SELECT * FROM vehicle_locations 
    WHERE vehicle_id = vi.vehicle_id 
    ORDER BY timestamp DESC 
    LIMIT 1
) vl ON true;

-- 2. 重建vehicle_status_summary视图
CREATE OR REPLACE VIEW vehicle_status_summary AS
SELECT 
    COUNT(*) as total_vehicles,
    COUNT(CASE WHEN connection_status = 'ONLINE' THEN 1 END) as online_vehicles,
    COUNT(CASE WHEN connection_status = 'RECENT' THEN 1 END) as recent_vehicles,
    COUNT(CASE WHEN connection_status = 'OFFLINE' THEN 1 END) as offline_vehicles,
    AVG(CASE WHEN speed IS NOT NULL THEN speed END) as avg_speed,
    MAX(last_location_time) as latest_update
FROM vehicle_complete_info;

-- 3. 重建vehicle_info_with_location视图
CREATE OR REPLACE VIEW vehicle_info_with_location AS
SELECT 
    vi.vehicle_id as sys_vehicle_id,
    vi.license_plate as vehicle_plate,
    vi.brand,
    vi.owning_unit,
    ST_X(vl.location) as longitude,
    ST_Y(vl.location) as latitude,
    vl.altitude,
    vl.heading,
    vl.speed,
    vl.timestamp as location_time,
    CASE 
        WHEN vl.timestamp > NOW() - INTERVAL '10 minutes' THEN 'ACTIVE'
        WHEN vl.timestamp > NOW() - INTERVAL '1 hour' THEN 'RECENT'
        ELSE 'INACTIVE'
    END as status
FROM sys_vehicle_info vi
LEFT JOIN LATERAL (
    SELECT * FROM vehicle_locations 
    WHERE vehicle_id = vi.vehicle_id 
    ORDER BY timestamp DESC 
    LIMIT 1
) vl ON true;

-- 4. 重建vehicle_trajectory_view视图
CREATE OR REPLACE VIEW vehicle_trajectory_view AS
SELECT 
    vi.license_plate as vehicle_plate,
    vi.brand,
    vt.trajectory_date,
    vt.point_count,
    vt.start_time,
    vt.end_time,
    vt.total_distance
FROM sys_vehicle_info vi
JOIN vehicle_trajectories vt ON vt.vehicle_id = vi.vehicle_id;

-- ============================================
-- 第五阶段：数据完整性最终验证
-- ============================================

-- 验证表结构
DO $$
BEGIN
    -- 验证sys_vehicle_info表
    IF NOT EXISTS (
        SELECT 1 FROM information_schema.columns 
        WHERE table_name = 'sys_vehicle_info' 
        AND column_name = 'license_plate'
    ) THEN
        RAISE EXCEPTION 'sys_vehicle_info表的license_plate字段不存在';
    END IF;
    
    -- 验证vehicle_locations表
    IF NOT EXISTS (
        SELECT 1 FROM information_schema.columns 
        WHERE table_name = 'vehicle_locations' 
        AND column_name = 'vehicle_id'
        AND data_type = 'bigint'
    ) THEN
        RAISE EXCEPTION 'vehicle_locations表的vehicle_id字段类型不正确';
    END IF;
    
    -- 验证视图存在
    IF NOT EXISTS (
        SELECT 1 FROM information_schema.views 
        WHERE table_name = 'vehicle_complete_info'
    ) THEN
        RAISE EXCEPTION 'vehicle_complete_info视图不存在';
    END IF;
    
    RAISE NOTICE '数据模型统一重构完成！所有表结构和视图已成功更新。';
END $$;

-- ============================================
-- 第六阶段：清理工作
-- ============================================

-- 删除临时表（如果存在）
DROP TABLE IF EXISTS vehicle_id_mapping;

-- 提交事务
COMMIT;

-- ============================================
-- 成功提示
-- ============================================
\echo '============================================='
\echo '数据模型统一重构成功完成！'
\echo '✅ 所有表的vehicle_id字段已统一为BIGINT类型'
\echo '✅ 所有表的车牌号字段已统一命名为license_plate'
\echo '✅ 所有业务视图已重新创建'
\echo '✅ 所有索引已重新构建'
\echo '============================================='