import json
import os
from pathlib import Path

import datasets
from PIL import Image
import jsonlines

logger = datasets.logging.get_logger(__name__)

_CITATION = """\
@misc{chen2024paligemma,
  title={PaliGemma Multitask Dataset},
  author={Chen, Xingqiang},
  year={2024},
  publisher={Hugging Face}
}
"""

_DESCRIPTION = """\
This dataset contains images and annotations for defect detection and analysis,
designed for training and evaluating the PaliGemma multitask model.
The dataset includes both basic defect detection samples and a larger set of
874 annotated images from real-world structural inspections.
"""

_HOMEPAGE = "https://huggingface.co/datasets/xingqiang/paligemma-multitask-dataset"

class PaligemmaDataset(datasets.GeneratorBasedBuilder):
    """PaliGemma Multitask Dataset for defect detection and analysis."""

    VERSION = datasets.Version("1.1.0")

    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features({
                "image": datasets.Image(),
                "boxes": datasets.Sequence(datasets.Sequence(datasets.Value("float32"), length=4)),
                "labels": datasets.Sequence(datasets.ClassLabel(names=["void", "crack"])),
                "caption": datasets.Value("string"),
                "source": datasets.Value("string"),
            }),
            supervised_keys=None,
            homepage=_HOMEPAGE,
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        """Returns SplitGenerators."""
        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "split": "train",
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.VALIDATION,
                gen_kwargs={
                    "split": "val",
                },
            ),
            datasets.SplitGenerator(
                name=datasets.Split.TEST,
                gen_kwargs={
                    "split": "test",
                },
            ),
        ]

    def _generate_examples(self, split):
        """生成示例。"""
        # 优先加载统一格式的注释
        unified_path = os.path.join("annotations", f"{split}_unified.json")
        if os.path.exists(unified_path):
            logger.info(f"使用统一格式的注释文件: {unified_path}")
            with open(unified_path, encoding="utf-8") as f:
                annotations = json.load(f)
                for idx, ann in enumerate(annotations):
                    image_path = os.path.join("images", split, ann["image_filename"])
                    try:
                        yield f"unified_{idx}", {
                            "image": image_path,
                            "boxes": ann["boxes"],
                            "labels": ann["labels"],
                            "caption": ann["caption"],
                            "source": ann.get("source", "unified")
                        }
                    except Exception as e:
                        logger.warning(f"跳过无效图像 {image_path}: {e}")
                        continue
            return  # 如果使用了统一格式，不再处理其他格式
        
        # 如果没有统一格式，则回退到原始格式
        # 加载原始 JSON 注释
        json_path = os.path.join("annotations", f"{split}.json")
        if os.path.exists(json_path):
            with open(json_path, encoding="utf-8") as f:
                annotations = json.load(f)
                for idx, ann in enumerate(annotations):
                    image_path = os.path.join("images", split, ann["image_filename"])
                    try:
                        # 不要尝试在这里打开图像，只返回路径
                        yield f"orig_{idx}", {
                            "image": image_path,
                            "boxes": ann["boxes"],
                            "labels": ann["labels"],
                            "caption": ann["caption"],
                            "source": "original"
                        }
                    except Exception as e:
                        logger.warning(f"跳过无效图像 {image_path}: {e}")
                        continue

        # 加载 JSONL 注释
        jsonl_path = os.path.join("annotations", f"_annotations.{split}.jsonl")
        if os.path.exists(jsonl_path):
            with jsonlines.open(jsonl_path) as reader:
                for idx, ann in enumerate(reader):
                    # 确保使用正确的图像文件名
                    image_filename = ann.get("image", "")
                    image_path = os.path.join("images", split, image_filename)
                    
                    try:
                        # 不要尝试在这里打开图像，只返回路径
                        # 转换注释为我们的格式
                        if "annotations" in ann:
                            # 处理新格式
                            boxes = [[b["x"], b["y"], b["width"], b["height"]] for b in ann["annotations"]]
                            labels = [0 if b["class"] == "void" else 1 for b in ann["annotations"]]
                            caption = f"Image contains {len(boxes)} defects: " + \
                                    ", ".join([b["class"] for b in ann["annotations"]])
                        else:
                            # 处理旧格式 (prefix/suffix)
                            # 这里需要解析 suffix 中的位置信息
                            boxes = []
                            labels = []
                            if "suffix" in ann:
                                parts = ann["suffix"].split(";")
                                for part in parts:
                                    part = part.strip()
                                    if "<loc" in part:
                                        # 解析位置和标签
                                        loc_parts = part.split()
                                        if len(loc_parts) >= 2:
                                            # 提取坐标
                                            coords = []
                                            for loc in loc_parts[0].split("><"):
                                                if loc.startswith("<loc"):
                                                    coords.append(int(loc[4:-1]) / 1024)  # 归一化坐标
                                            
                                            if len(coords) == 4:
                                                boxes.append(coords)
                                                label = 0 if "void" in loc_parts[1] else 1
                                                labels.append(label)
                        
                            caption = ann.get("prefix", "")
                        
                        # 检查图像是否存在
                        image_exists = False
                        
                        # 检查images/datasets目录
                        if os.path.exists(f"images/datasets/{image_filename}"):
                            image_exists = True
                            
                        # 检查原始路径
                        if not image_exists:
                            for img_split in ["train", "val", "test"]:
                                if os.path.exists(f"images/{img_split}/{image_filename}"):
                                    image_exists = True
                                    break
                        
                        if not image_exists:
                            print(f"警告: 图像文件不存在: {image_filename}")
                            continue
                        
                        yield f"p1v1_{idx}", {
                            "image": image_path,
                            "boxes": boxes,
                            "labels": labels,
                            "caption": caption,
                            "source": "p1v1"
                        }
                    except Exception as e:
                        logger.warning(f"跳过无效注释 {image_path}: {e}")
                        continue

def convert_annotations_to_unified_format():
    """将所有注释转换为统一格式"""
    print("开始转换注释为统一格式...")
    
    # 确保annotations目录存在
    os.makedirs("annotations", exist_ok=True)

    # 增加对valid分割的处理（有些文件使用valid而不是val）
    for split in ["train", "val", "valid", "test"]:
        print(f"处理 {split} 分割...")
        unified_annotations = []
        
        # 处理 JSON 注释
        json_path = f"annotations/{split}.json"
        print(f"检查 JSON 文件: {json_path}")
        if os.path.exists(json_path):
            print(f"找到 JSON 文件: {json_path}")
            with open(json_path, encoding="utf-8") as f:
                try:
                    annotations = json.load(f)
                    print(f"从 {json_path} 加载了 {len(annotations)} 条注释")
                    for ann in annotations:
                        unified_annotations.append({
                            "image_filename": ann["image_filename"],
                            "boxes": ann["boxes"],
                            "labels": ann["labels"],
                            "caption": ann["caption"],
                            "source": "original"
                        })
                except json.JSONDecodeError:
                    print(f"错误: {json_path} 不是有效的 JSON 文件")
        else:
            print(f"未找到 JSON 文件: {json_path}")
        
        # 处理 JSONL 注释，包括目录p-1.v1i.paligemma下的文件
        jsonl_variants = [
            f"_annotations.{split}.jsonl", 
            f"_annotations.{split}1.jsonl",
            f"p-1.v1i.paligemma/_annotations.{split}.jsonl",
            f"p-1.v1i.paligemma/_annotations.{split}1.jsonl"
        ]
        
        for jsonl_variant in jsonl_variants:
            jsonl_path = f"annotations/{jsonl_variant}"
            print(f"检查 JSONL 文件: {jsonl_path}")
            if os.path.exists(jsonl_path):
                print(f"找到 JSONL 文件: {jsonl_path}")
                annotation_count = 0
                with open(jsonl_path, encoding="utf-8") as f:
                    for line_num, line in enumerate(f, 1):
                        try:
                            line = line.strip()
                            if not line:  # 跳过空行
                                print(f"跳过第 {line_num} 行: 空行")
                                continue
                                
                            ann = json.loads(line)
                            image_filename = ann.get("image", "")
                            
                            if not image_filename:
                                print(f"跳过第 {line_num} 行: 没有图像文件名")
                                continue
                                
                            # 检查图像是否存在
                            image_exists = False
                            
                            # 检查images/datasets目录
                            if os.path.exists(f"images/datasets/{image_filename}"):
                                image_exists = True
                                
                            # 检查原始路径
                            if not image_exists:
                                for img_split in ["train", "val", "test"]:
                                    if os.path.exists(f"images/{img_split}/{image_filename}"):
                                        image_exists = True
                                        break
                            
                            if not image_exists:
                                print(f"警告: 图像文件不存在: {image_filename}")
                                continue
                            
                            # 转换为统一格式
                            if "annotations" in ann:
                                # 处理新格式
                                boxes = [[b["x"], b["y"], b["width"], b["height"]] for b in ann["annotations"]]
                                labels = [0 if b["class"] == "void" else 1 for b in ann["annotations"]]
                                caption = f"Image contains {len(boxes)} defects: " + \
                                        ", ".join([b["class"] for b in ann["annotations"]])
                            else:
                                # 处理旧格式 (prefix/suffix)
                                boxes = []
                                labels = []
                                caption = ann.get("prefix", "")
                                
                                if "suffix" in ann:
                                    parts = ann["suffix"].split(";")
                                    for part in parts:
                                        part = part.strip()
                                        if "<loc" in part:
                                            # 解析位置和标签
                                            loc_parts = part.split()
                                            if len(loc_parts) >= 2:
                                                # 提取坐标
                                                coords = []
                                                for loc in loc_parts[0].split("><"):
                                                    if loc.startswith("<loc"):
                                                        try:
                                                            coords.append(int(loc[4:-1]) / 1024)  # 归一化坐标
                                                        except ValueError:
                                                            continue
                                                
                                                if len(coords) == 4:
                                                    boxes.append(coords)
                                                    label = 0 if "void" in loc_parts[1] else 1
                                                    labels.append(label)
                            
                            unified_annotations.append({
                                "image_filename": image_filename,
                                "boxes": boxes,
                                "labels": labels,
                                "caption": caption,
                                "source": "p1v1"
                            })
                            annotation_count += 1
                        except json.JSONDecodeError as e:
                            print(f"警告: {jsonl_path} 第 {line_num} 行不是有效的 JSON: {e}")
                            continue
                print(f"从 {jsonl_path} 加载了 {annotation_count} 条注释")
            else:
                print(f"未找到 JSONL 文件: {jsonl_path}")
        
        # 如果是valid分割，与val合并
        if split == "valid" and os.path.exists(f"annotations/val_unified.json"):
            try:
                with open(f"annotations/val_unified.json", "r", encoding="utf-8") as f:
                    val_annotations = json.load(f)
                unified_annotations.extend(val_annotations)
                print(f"将valid分割与val分割合并，共 {len(unified_annotations)} 条记录")
            except Exception as e:
                print(f"合并valid和val分割时出错: {e}")
                
        # 保存统一格式的注释
        if unified_annotations:
            # 对于valid分割，保存为val_unified.json
            save_split = "val" if split == "valid" else split
            print(f"为 {save_split} 创建统一格式注释，共 {len(unified_annotations)} 条记录")
            unified_path = f"annotations/{save_split}_unified.json"
            with open(unified_path, "w", encoding="utf-8") as f:
                json.dump(unified_annotations, f, ensure_ascii=False, indent=2)
            print(f"已保存统一格式注释到: {unified_path}")
        else:
            print(f"警告: {split} 没有有效的注释，跳过创建统一格式文件")