# -*- coding: utf-8 -*-
from .__load__ import *
import sys
import asyncio
import textwrap
import subprocess
import pysrt
import json
from edge_tts import Communicate

MAX_CHARS = 300

def output_json(success, message, mp3_path=None, srt_path=None):
    print(json.dumps({
        "success": success,
        "message": message,
        "mp3": mp3_path,
        "srt": srt_path
    }))
    sys.exit(0 if success else 1)

# 参数校验
if len(sys.argv) < 4:
    output_json(False, "Usage: python tts_split_and_merge.py <text_file> <voice> <output_dir>")

TEXT_FILE = sys.argv[1]
VOICE = sys.argv[2]
OUTPUT_DIR = sys.argv[3]
FINAL_MP3 = os.path.join(OUTPUT_DIR, "1.mp3")
FINAL_SRT = os.path.join(OUTPUT_DIR, "1.srt")

os.makedirs(OUTPUT_DIR, exist_ok=True)

def split_text(text, max_len=MAX_CHARS):
    return textwrap.wrap(text, max_len, break_long_words=False, break_on_hyphens=False)

async def synthesize_segments(segments):
    for i, segment in enumerate(segments):
        mp3_path = os.path.join(OUTPUT_DIR, f"part_{i}.mp3")
        srt_path = os.path.join(OUTPUT_DIR, f"part_{i}.srt")
        communicate = Communicate(text=segment, voice=VOICE)
        await communicate.save(mp3_path, srt_path)

def merge_mp3_files():
    concat_list_path = os.path.join(OUTPUT_DIR, "concat_list.txt")
    with open(concat_list_path, "w", encoding="utf-8") as f:
        i = 0
        while True:
            mp3_file = os.path.join(OUTPUT_DIR, f"part_{i}.mp3")
            if not os.path.exists(mp3_file): break
            f.write(f"file '{os.path.abspath(mp3_file)}'\n")
            i += 1

    subprocess.run([
        "ffmpeg", "-f", "concat", "-safe", "0",
        "-i", concat_list_path, "-c", "copy", FINAL_MP3
    ], check=True)

def merge_srt_files():
    subtitles = pysrt.SubRipFile()
    current_offset = 0
    i = 0
    while True:
        srt_path = os.path.join(OUTPUT_DIR, f"part_{i}.srt")
        if not os.path.exists(srt_path): break
        part_subs = pysrt.open(srt_path)
        for sub in part_subs:
            sub.shift(seconds=current_offset)
        if part_subs:
            last_end = part_subs[-1].end.ordinal / 1000.0
            current_offset += last_end
        subtitles.extend(part_subs)
        i += 1
    subtitles.save(FINAL_SRT, encoding='utf-8')

async def main():
    try:
        with open(TEXT_FILE, "r", encoding="utf-8") as f:
            text = f.read()

        segments = split_text(text)
        await synthesize_segments(segments)
        merge_mp3_files()
        merge_srt_files()

        output_json(True, "Synthesis completed successfully", FINAL_MP3, FINAL_SRT)
    except Exception as e:
        output_json(False, f"Error: {str(e)}")

if __name__ == "__main__":
    asyncio.run(main())