"""
直接使用用户输入的 prompt 调用本地 Z-Image-Turbo 出图。

复用 config.yaml 中的 image / lora / output 等推理配置；
不对 prompt 做 LLM 改写，不自动拼接 LoRA 触发词（触发词请自行写进 prompt）。
"""

from __future__ import annotations

import argparse
import sys
import time
from datetime import datetime
from pathlib import Path

from poetry_to_image import (
    create_generator,
    load_config,
    load_pipeline,
    resolve_image_size,
)


def _read_prompt_from_file(path: Path) -> str:
    """按 UTF-8 原样读取文件，不做 strip 或换行规范化以外的解码。"""
    return path.read_bytes().decode("utf-8")


def _collect_prompts(args: argparse.Namespace) -> list[str]:
    prompts: list[str] = []
    if args.prompts:
        prompts.extend(args.prompts)
    for fp in args.prompt_files or []:
        p = Path(fp)
        if not p.is_file():
            print(f"错误: 文件不存在: {p}", file=sys.stderr)
            sys.exit(1)
        prompts.append(_read_prompt_from_file(p))
    if not prompts and not sys.stdin.isatty():
        prompts.append(sys.stdin.buffer.read().decode("utf-8"))
    if not prompts and sys.stdin.isatty():
        print("请输入 prompt（空行结束）：")
        lines: list[str] = []
        while True:
            try:
                line = input()
            except EOFError:
                break
            if line == "":
                break
            lines.append(line)
        text = "\n".join(lines)
        if text:
            prompts.append(text)
    return prompts


def _generate(
    pipe,
    prompt: str,
    *,
    cfg: dict,
    index: int,
    output_dir: Path,
    filename_prefix: str,
) -> list[Path]:
    """对单条 prompt 出图；prompt 字符串原样传入 pipeline。"""
    img_cfg = cfg["image"]
    out_cfg = cfg["output"]
    device = cfg.get("_resolved_device", "cpu")

    width, height = resolve_image_size(img_cfg)
    steps = img_cfg.get("num_inference_steps", 9)
    guidance = img_cfg.get("guidance_scale", 0.0)
    seed = img_cfg.get("seed", -1)
    images_per_prompt = max(1, min(10, img_cfg.get("images_per_prompt", 1)))

    saved: list[Path] = []
    for j in range(images_per_prompt):
        variant_offset = index * 100 + j
        if seed >= 0:
            actual_seed = seed + variant_offset
        else:
            actual_seed = int(time.time() * 1000) % (2**32) + variant_offset
        generator = create_generator(device, actual_seed)
        seed_suffix = chr(ord("a") + j) if images_per_prompt > 1 else ""

        if images_per_prompt > 1:
            print(f"  --- 第 {j + 1}/{images_per_prompt} 张 (seed={actual_seed}) ---")

        start = time.time()
        result = pipe(
            prompt=prompt,
            height=height,
            width=width,
            num_inference_steps=steps,
            guidance_scale=guidance,
            generator=generator,
        )
        image = result.images[0]
        elapsed = time.time() - start
        print(f"  生成完成，耗时 {elapsed:.1f}s")

        img_path = output_dir / f"{filename_prefix}_{index:02d}{seed_suffix}.png"
        image.save(img_path)
        saved.append(img_path)
        print(f"  已保存: {img_path}")

        if out_cfg.get("save_prompts", True):
            txt_path = output_dir / f"{filename_prefix}_{index:02d}{seed_suffix}_prompt.txt"
            txt_path.write_bytes(prompt.encode("utf-8"))

    return saved


def main() -> None:
    parser = argparse.ArgumentParser(
        description="Z-Image-Turbo 直出图：使用用户给定 prompt，不做文本侧处理"
    )
    parser.add_argument(
        "-c", "--config",
        default="config.yaml",
        help="配置文件路径（默认: config.yaml）",
    )
    parser.add_argument(
        "-p", "--prompt",
        action="append",
        dest="prompts",
        metavar="TEXT",
        help="prompt 文本；可多次指定以连续生成多张不同 prompt",
    )
    parser.add_argument(
        "-f", "--file",
        action="append",
        dest="prompt_files",
        metavar="PATH",
        help="从 UTF-8 文件读取整段 prompt；可多次指定",
    )
    parser.add_argument(
        "-o", "--output",
        default=None,
        help="输出目录（默认: output 下按日期时间分子目录，与 poetry_to_image 一致）",
    )
    parser.add_argument(
        "--flat-output",
        action="store_true",
        help="将输出直接写入配置中的 output.dir，不再追加 日期/时间 子目录",
    )
    args = parser.parse_args()

    cfg = load_config(args.config)
    if args.output:
        cfg["output"]["dir"] = args.output
    elif not args.flat_output:
        base = Path(cfg["output"].get("dir", "./output"))
        now = datetime.now()
        cfg["output"]["dir"] = str(base / now.strftime("%Y-%m-%d") / now.strftime("%H-%M-%S"))

    prompts = _collect_prompts(args)
    if not prompts:
        print("未提供任何 prompt。", file=sys.stderr)
        sys.exit(1)

    for k, p in enumerate(prompts, 1):
        if not p:
            print(f"警告: 第 {k} 条 prompt 为空，已跳过。", file=sys.stderr)

    prompts = [p for p in prompts if p]
    if not prompts:
        sys.exit(1)

    out_dir = Path(cfg["output"].get("dir", "./output"))
    out_dir.mkdir(parents=True, exist_ok=True)
    prefix = cfg["output"].get("filename_prefix", "zimg")

    img_cfg = cfg["image"]
    width, height = resolve_image_size(img_cfg)
    preset = img_cfg.get("size_preset", "custom")
    print(f"\n输出目录: {out_dir.resolve()}")
    print(f"图片尺寸: {width}×{height}" + (f" (预设: {preset})" if preset != "custom" else ""))
    print(f"共 {len(prompts)} 条 prompt，将依次原样送模型推理。\n")

    pipe = load_pipeline(cfg)

    all_saved: list[Path] = []
    for i, prompt in enumerate(prompts, 1):
        preview = prompt if len(prompt) <= 160 else prompt[:160] + "..."
        print(f"[{i}/{len(prompts)}] Prompt:\n{preview}\n")
        all_saved.extend(
            _generate(
                pipe,
                prompt,
                cfg=cfg,
                index=i,
                output_dir=out_dir,
                filename_prefix=prefix,
            )
        )

    print(f"\n全部完成，共 {len(all_saved)} 个文件。")


if __name__ == "__main__":
    main()