#!/usr/bin/env python3
"""
修复数据库中的版本链接错误和is_latest标记
"""
import psycopg
from datetime import datetime

try:
    conn = psycopg.connect(
        host='192.168.0.61',
        port=55432,
        dbname='njts_acct',
        user='njts_app',
        password='njts_app2025'
    )
    
    with conn.cursor() as cur:
        print("=" * 70)
        print("【数据库修复：版本链接和is_latest标记】")
        print("=" * 70)
        
        # 第一步：识别【修正後】記錄，並確保其 original_entry_id 指向真正的原始版本
        print("\n【步驟 1】修復 original_entry_id 鏈接...")
        
        # 查找所有【修正後】的記錄
        cur.execute("""
            SELECT journal_entry_id, description, original_entry_id
            FROM journal_entries
            WHERE description LIKE '%【修正後】%'
            AND is_deleted = false
            ORDER BY journal_entry_id
        """)
        
        corrupted_count = 0
        for row in cur.fetchall():
            je_id, desc, orig_id = row
            
            # 如果original_entry_id指向另一个【修正後】記錄，就往上追溯
            if orig_id:
                cur.execute("""
                    SELECT original_entry_id, description 
                    FROM journal_entries 
                    WHERE journal_entry_id = %s
                """, (orig_id,))
                parent_row = cur.fetchone()
                
                if parent_row:
                    parent_orig_id, parent_desc = parent_row
                    # 如果指向的記錄也是【修正後】，說明有鏈接錯誤
                    if '【修正後】' in parent_desc and parent_orig_id and parent_orig_id != orig_id:
                        print(f"\n修復 ID={je_id}: {desc[:30]}")
                        print(f"  舊的 original_entry_id: {orig_id} (也是【修正後】記錄)")
                        print(f"  新的 original_entry_id: {parent_orig_id}")
                        
                        cur.execute("""
                            UPDATE journal_entries 
                            SET original_entry_id = %s 
                            WHERE journal_entry_id = %s
                        """, (parent_orig_id, je_id))
                        corrupted_count += 1
        
        conn.commit()
        if corrupted_count > 0:
            print(f"\n✓ 已修復 {corrupted_count} 條記錄的 original_entry_id")
        else:
            print("✓ 沒有發現 original_entry_id 鏈接錯誤")
        
        # 第二步：重新設置 is_latest 標記
        print("\n【步驟 2】重新設置 is_latest 標記...")
        
        # 清空所有 is_latest 標記
        cur.execute("UPDATE journal_entries SET is_latest = false WHERE is_deleted = false")
        conn.commit()
        
        # 對每條版本鏈，只有最新版本的 is_latest = true
        cur.execute("""
            SELECT DISTINCT original_entry_id FROM journal_entries 
            WHERE original_entry_id IS NOT NULL AND is_deleted = false
            UNION
            SELECT DISTINCT journal_entry_id FROM journal_entries 
            WHERE original_entry_id IS NULL AND is_deleted = false
            AND journal_entry_id NOT IN (
                SELECT original_entry_id FROM journal_entries WHERE original_entry_id IS NOT NULL
            )
        """)
        
        chain_heads = [row[0] for row in cur.fetchall()]
        
        updated_count = 0
        for chain_head in chain_heads:
            # 找出這條鏈中最新的版本（根據 created_at 或 journal_entry_id）
            cur.execute("""
                SELECT journal_entry_id FROM journal_entries
                WHERE (journal_entry_id = %s OR original_entry_id = %s)
                AND is_deleted = false
                ORDER BY journal_entry_id DESC
                LIMIT 1
            """, (chain_head, chain_head))
            
            latest = cur.fetchone()
            if latest:
                latest_id = latest[0]
                cur.execute("""
                    UPDATE journal_entries 
                    SET is_latest = true 
                    WHERE journal_entry_id = %s
                """, (latest_id,))
                updated_count += 1
        
        conn.commit()
        print(f"✓ 已設置 {updated_count} 條最新版本的 is_latest = true")
        
        # 第三步：驗證
        print("\n【步驟 3】驗證修復結果...")
        print("-" * 70)
        
        # 檢查是否有多個 is_latest=true 在同一個鏈中
        cur.execute("""
            SELECT original_entry_id, COUNT(*) as cnt
            FROM journal_entries
            WHERE is_latest = true AND is_deleted = false AND original_entry_id IS NOT NULL
            GROUP BY original_entry_id
            HAVING COUNT(*) > 1
        """)
        
        duplicates = cur.fetchall()
        if duplicates:
            print("⚠️  警告：發現重複的 is_latest=true")
            for dup in duplicates:
                print(f"  original_entry_id={dup[0]}: {dup[1]} 條記錄")
        else:
            print("✓ 沒有發現重複的 is_latest=true")
        
        # 統計各狀態的記錄數
        cur.execute("""
            SELECT is_latest, COUNT(*) as cnt
            FROM journal_entries
            WHERE is_deleted = false
            GROUP BY is_latest
        """)
        
        stats = cur.fetchall()
        print("\n記錄統計：")
        for stat in stats:
            print(f"  is_latest={stat[0]}: {stat[1]} 條")
        
        # 驗證【test元】的鏈
        print("\n【test 元】鏈的驗證：")
        print("-" * 70)
        cur.execute("""
            SELECT journal_entry_id, description, is_latest, revision_count, original_entry_id
            FROM journal_entries
            WHERE (description LIKE '%test%' AND is_deleted = false)
            AND journal_entry_id >= 410
            ORDER BY journal_entry_id
        """)
        
        test_records = cur.fetchall()
        for rec in test_records:
            je_id, desc, is_latest, rev_cnt, orig_id = rec
            status = "✓" if is_latest else " "
            print(f"{status} ID={je_id:3d} rev={rev_cnt} orig_id={str(orig_id):>6s} {desc[:40]}")
        
        conn.close()
        print("\n" + "=" * 70)
        print("修復完成！")
        print("=" * 70)

except Exception as e:
    print(f'錯誤: {e}')
    import traceback
    traceback.print_exc()