import csv
import re
import mysql.connector
import requests
from datetime import datetime
from pkg.config import TABLE_NAME,DB_CONFIG,INPUT_FILE,OUTPUT_FILE

def download_file(file_path):
    url = 'https://www.xtracker.io/api/download'
    headers = {
        'Accept': '*/*', 'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6,zh-TW;q=0.5',
        'Cache-Control': 'no-cache', 'Connection': 'keep-alive', 'Content-Type': 'application/json',
        'Origin': 'https://www.xtracker.io', 'Pragma': 'no-cache', 'Referer': 'https://www.xtracker.io/',
        'Sec-Fetch-Dest': 'empty', 'Sec-Fetch-Mode': 'cors', 'Sec-Fetch-Site': 'same-origin',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.0',
        'sec-ch-ua': '"Not(A:Brand";v="99", "Microsoft Edge";v="133", "Chromium";v="133"', 'sec-ch-ua-mobile': '?0',
        'sec-ch-ua-platform': '"Windows"'
    }
    data = '{"handle":"elonmusk","platform":"X"}'
    try:
        response = requests.post(url, headers=headers, data=data)
        if response.status_code == 200:
            with open(file_path, 'wb') as f:
                f.write(response.content)
            return True, "File downloaded successfully"
        else:
            return False, f"Download failed with status code {response.status_code}: {response.text}"
    except Exception as e:
        return False, f"Error downloading file: {str(e)}"

def fix_line(lines, line_number, rank_id):
    full_line = ''.join(lines)
    match = re.search(r'^([^,]+),"(.+?)","([A-Z][a-z]{2} \d{1,2}, \d{1,2}:\d{2}:\d{2} (AM|PM) E[SD]T)"$', full_line,
                      re.DOTALL)
    if match:
        id_part = match.group(1)
        text_content = match.group(2)
        created_at = match.group(3)
        fixed_text = text_content.replace('"', '""')
        fixed_line = f'{rank_id},{id_part},"{fixed_text}","{created_at}"'
        return fixed_line
    else:
        print(f"Line {line_number} format error: {repr(full_line)}")
        return f'{rank_id},{full_line}'

def process_file(input_file, output_file):
    with open(input_file, 'r', encoding='utf-8') as f_in, open(output_file, 'w', encoding='utf-8') as f_out:
        f_out.write("rank_id,id,text,created_at\n")
        buffer = []
        line_number = 0
        rank_id = 1
        for line in f_in:
            line = line.rstrip('\n')
            if line.startswith('id,text,created_at'):
                continue
            line_number += 1
            buffer.append(line)
            if line.endswith('"') and re.search(r'"[A-Z][a-z]{2} \d{1,2}, \d{1,2}:\d{2}:\d{2} (AM|PM) E[SD]T"$', line):
                fixed_line = fix_line(buffer, line_number, rank_id)
                f_out.write(fixed_line + '\n')
                buffer = []
                rank_id += 1
        if buffer:
            fixed_line = fix_line(buffer, line_number, rank_id)
            f_out.write(fixed_line + '\n')
    return True, f"CSV 文件已修复并添加 rank_id，保存为 {output_file}"


def get_max_rank_id(cursor):
    try:
        cursor.execute(f"SELECT MAX(rank_id) FROM {TABLE_NAME}")
        result = cursor.fetchone()[0]
        return result if result is not None else 0, True, ""
    except mysql.connector.Error as e:
        return 0, False, f"Error getting max rank_id: {str(e)}"


def import_to_database(input_file: str) -> tuple[bool, str]:
    try:
        # Use context managers to ensure resources are closed properly
        with mysql.connector.connect(**DB_CONFIG) as conn, conn.cursor() as cursor:
            current_year = str(datetime.now().year)
            max_rank_id, success, error = get_max_rank_id(cursor)
            if not success:
                return False, error

            with open(input_file, 'r', encoding='utf-8') as f:
                reader = csv.reader(f)
                try:
                    next(reader)  # Skip header
                except StopIteration:
                    return False, "File is empty or has no valid header"

                total_rows, inserted = 0, 0
                for row in reader:
                    if len(row) != 4:
                        continue
                    try:
                        rank_id = int(row[0])
                        tweet_id = float(row[1])
                        text, created_at = row[2], row[3]
                    except (ValueError, IndexError) as e:
                        return False, f"Invalid data format in row: {str(e)}"

                    if rank_id <= max_rank_id:
                        continue

                    total_rows += 1
                    insert_query = f"""
                        INSERT INTO {TABLE_NAME} (rank_id, id, text, year, created_at, timestamp)
                        VALUES (%s, %s, %s, %s, %s, %s)
                    """
                    cursor.execute(insert_query, (rank_id, tweet_id, text, current_year, created_at, 0))
                    inserted += 1

                conn.commit()
                update_query = f"""
                    UPDATE {TABLE_NAME}
                    SET timestamp = UNIX_TIMESTAMP(
                        CONVERT_TZ(
                            STR_TO_DATE(
                                CONCAT(year, ' ', SUBSTRING_INDEX(created_at, ' ', 4)),
                                '%Y %b %d, %l:%i:%s %p'
                            ),
                            CASE
                                WHEN RIGHT(created_at, 3) = 'EDT' THEN 'America/New_York'
                                WHEN RIGHT(created_at, 3) = 'EST' THEN 'America/New_York'
                                ELSE 'UTC'
                            END,
                            'UTC'
                        )
                    ) + 8*60*60
                    WHERE rank_id > {max_rank_id}
                """
                cursor.execute(update_query)
                conn.commit()
            return True, f"Database import completed: {inserted} rows inserted"

    except mysql.connector.Error as e:
        return False, f"Database error: {str(e)}"
    except FileNotFoundError as e:
        return False, f"File not found: {str(e)}"
    except csv.Error as e:
        return False, f"CSV parsing error: {str(e)}"
    except Exception as e:
        return False, f"Unexpected error: {str(e)}"

def process_tweets():
    success, msg = download_file(INPUT_FILE)
    if not success:
        return False, msg
    success, msg = process_file(INPUT_FILE, OUTPUT_FILE)
    if not success:
        return False, msg
    success, msg = import_to_database(OUTPUT_FILE)
    return success, msg