# -*- coding: utf-8 -*-
"""将自动标注算子输出转换为 Label Studio 兼容格式。

支持的算子类型：
- LLMTextClassification   → choices
- LLMNamedEntityRecognition → labels (span)
- LLMRelationExtraction   → labels + relation
- ImageObjectDetectionBoundingBox → rectanglelabels
"""

from __future__ import annotations

import hashlib
import uuid
import xml.etree.ElementTree as ET
from typing import Any, Dict, List, Optional, Tuple

from loguru import logger

# ---------------------------------------------------------------------------
# 颜色调色板（Label Studio 背景色）
# ---------------------------------------------------------------------------

_LABEL_COLORS = [
    "#e53935",
    "#fb8c00",
    "#43a047",
    "#1e88e5",
    "#8e24aa",
    "#00897b",
    "#d81b60",
    "#3949ab",
    "#fdd835",
    "#6d4c41",
    "#546e7a",
    "#f4511e",
]


def _pick_color(index: int) -> str:
    return _LABEL_COLORS[index % len(_LABEL_COLORS)]


# ---------------------------------------------------------------------------
# 稳定 LS ID 生成（与 editor.py:118-136 一致）
# ---------------------------------------------------------------------------

def _stable_ls_id(seed: str) -> int:
    """生成稳定的 Label Studio 风格整数 ID（JS 安全整数范围内）。"""
    digest = hashlib.sha1(seed.encode("utf-8")).hexdigest()
    value = int(digest[:13], 16)
    return value if value > 0 else 1


def make_ls_task_id(project_id: str, file_id: str) -> int:
    return _stable_ls_id(f"task:{project_id}:{file_id}")


def make_ls_annotation_id(project_id: str, file_id: str) -> int:
    return _stable_ls_id(f"annotation:{project_id}:{file_id}")


# ---------------------------------------------------------------------------
# 确定性 region ID（关系抽取需要稳定引用）
# ---------------------------------------------------------------------------

_NAMESPACE_REGION = uuid.UUID("a1b2c3d4-e5f6-7890-abcd-ef1234567890")


def _make_region_id(
    project_id: str, file_id: str, text: str, entity_type: str, start: Any, end: Any
) -> str:
    seed = f"{project_id}:{file_id}:{text}:{entity_type}:{start}:{end}"
    return str(uuid.uuid5(_NAMESPACE_REGION, seed))


# ---------------------------------------------------------------------------
# 1. 文本分类
# ---------------------------------------------------------------------------

def convert_text_classification(
    annotation: Dict[str, Any], file_id: str, project_id: str
) -> Optional[Dict[str, Any]]:
    """将 LLMTextClassification 算子输出转换为 LS annotation。"""

    result_data = annotation.get("result")
    if not isinstance(result_data, dict):
        return None

    label = result_data.get("label")
    if not label:
        return None

    region_id = str(uuid.uuid4())
    ls_result = [
        {
            "id": region_id,
            "from_name": "sentiment",
            "to_name": "text",
            "type": "choices",
            "value": {"choices": [str(label)]},
        }
    ]

    return {
        "id": make_ls_annotation_id(project_id, file_id),
        "task": make_ls_task_id(project_id, file_id),
        "result": ls_result,
    }


# ---------------------------------------------------------------------------
# 2. 命名实体识别
# ---------------------------------------------------------------------------

def convert_ner(
    annotation: Dict[str, Any], file_id: str, project_id: str
) -> Optional[Dict[str, Any]]:
    """将 LLMNamedEntityRecognition 算子输出转换为 LS annotation。"""

    entities = annotation.get("entities")
    if not isinstance(entities, list) or not entities:
        return None

    ls_result: List[Dict[str, Any]] = []
    for ent in entities:
        if not isinstance(ent, dict):
            continue
        ent_text = ent.get("text", "")
        ent_type = ent.get("type", "")
        start = ent.get("start")
        end = ent.get("end")

        if not ent_text or start is None or end is None:
            continue

        region_id = _make_region_id(project_id, file_id, ent_text, ent_type, start, end)
        ls_result.append(
            {
                "id": region_id,
                "from_name": "label",
                "to_name": "text",
                "type": "labels",
                "value": {
                    "start": int(start),
                    "end": int(end),
                    "text": str(ent_text),
                    "labels": [str(ent_type)],
                },
            }
        )

    if not ls_result:
        return None

    return {
        "id": make_ls_annotation_id(project_id, file_id),
        "task": make_ls_task_id(project_id, file_id),
        "result": ls_result,
    }


# ---------------------------------------------------------------------------
# 3. 关系抽取
# ---------------------------------------------------------------------------

def _find_entity_region_id(
    entity_regions: List[Dict[str, Any]], text: str, entity_type: str
) -> Optional[str]:
    """在已生成的 entity regions 中查找匹配的 region ID。"""
    for region in entity_regions:
        value = region.get("value", {})
        if value.get("text") == text and entity_type in value.get("labels", []):
            return region["id"]
    return None


def convert_relation_extraction(
    annotation: Dict[str, Any], file_id: str, project_id: str
) -> Optional[Dict[str, Any]]:
    """将 LLMRelationExtraction 算子输出转换为 LS annotation。"""

    entities = annotation.get("entities", [])
    relations = annotation.get("relations", [])
    if not isinstance(entities, list):
        entities = []
    if not isinstance(relations, list):
        relations = []

    if not entities and not relations:
        return None

    # 构建实体 label regions（去重）
    entity_regions: List[Dict[str, Any]] = []
    seen_keys: set = set()

    for ent in entities:
        if not isinstance(ent, dict):
            continue
        ent_text = str(ent.get("text", "")).strip()
        ent_type = str(ent.get("type", "")).strip()
        start = ent.get("start")
        end = ent.get("end")

        if not ent_text or start is None or end is None:
            continue

        dedup_key = (ent_text, ent_type, int(start), int(end))
        if dedup_key in seen_keys:
            continue
        seen_keys.add(dedup_key)

        region_id = _make_region_id(project_id, file_id, ent_text, ent_type, start, end)
        entity_regions.append(
            {
                "id": region_id,
                "from_name": "label",
                "to_name": "text",
                "type": "labels",
                "value": {
                    "start": int(start),
                    "end": int(end),
                    "text": ent_text,
                    "labels": [ent_type],
                },
            }
        )

    # 构建关系
    relation_results: List[Dict[str, Any]] = []
    for rel in relations:
        if not isinstance(rel, dict):
            continue

        subject = rel.get("subject")
        obj = rel.get("object")
        relation_type = str(rel.get("relation", "")).strip()

        if not isinstance(subject, dict) or not isinstance(obj, dict) or not relation_type:
            continue

        subj_text = str(subject.get("text", "")).strip()
        subj_type = str(subject.get("type", "")).strip()
        obj_text = str(obj.get("text", "")).strip()
        obj_type = str(obj.get("type", "")).strip()

        from_id = _find_entity_region_id(entity_regions, subj_text, subj_type)
        to_id = _find_entity_region_id(entity_regions, obj_text, obj_type)

        if not from_id or not to_id:
            logger.debug(
                "Skipping relation '{}': could not find region for subject='{}' or object='{}'",
                relation_type,
                subj_text,
                obj_text,
            )
            continue

        relation_results.append(
            {
                "from_id": from_id,
                "to_id": to_id,
                "type": "relation",
                "direction": "right",
                "labels": [relation_type],
            }
        )

    ls_result = entity_regions + relation_results
    if not ls_result:
        return None

    return {
        "id": make_ls_annotation_id(project_id, file_id),
        "task": make_ls_task_id(project_id, file_id),
        "result": ls_result,
    }


# ---------------------------------------------------------------------------
# 4. 目标检测
# ---------------------------------------------------------------------------

def convert_object_detection(
    annotation: Dict[str, Any], file_id: str, project_id: str
) -> Optional[Dict[str, Any]]:
    """将 ImageObjectDetectionBoundingBox 算子输出转换为 LS annotation。"""

    detections = annotation.get("detections")
    if not isinstance(detections, list) or not detections:
        return None

    img_width = annotation.get("width", 0)
    img_height = annotation.get("height", 0)
    if not img_width or not img_height:
        return None

    ls_result: List[Dict[str, Any]] = []
    for det in detections:
        if not isinstance(det, dict):
            continue

        label = det.get("label", "unknown")
        bbox = det.get("bbox_xyxy")
        if not isinstance(bbox, (list, tuple)) or len(bbox) < 4:
            continue

        x1, y1, x2, y2 = float(bbox[0]), float(bbox[1]), float(bbox[2]), float(bbox[3])
        x_pct = x1 * 100.0 / img_width
        y_pct = y1 * 100.0 / img_height
        w_pct = (x2 - x1) * 100.0 / img_width
        h_pct = (y2 - y1) * 100.0 / img_height

        region_id = str(uuid.uuid4())
        ls_result.append(
            {
                "id": region_id,
                "from_name": "label",
                "to_name": "image",
                "type": "rectanglelabels",
                "original_width": int(img_width),
                "original_height": int(img_height),
                "image_rotation": 0,
                "value": {
                    "x": round(x_pct, 4),
                    "y": round(y_pct, 4),
                    "width": round(w_pct, 4),
                    "height": round(h_pct, 4),
                    "rotation": 0,
                    "rectanglelabels": [str(label)],
                },
            }
        )

    if not ls_result:
        return None

    return {
        "id": make_ls_annotation_id(project_id, file_id),
        "task": make_ls_task_id(project_id, file_id),
        "result": ls_result,
    }


# ---------------------------------------------------------------------------
# 分发器
# ---------------------------------------------------------------------------

TASK_TYPE_CONVERTERS = {
    "text_classification": convert_text_classification,
    "ner": convert_ner,
    "relation_extraction": convert_relation_extraction,
    "object_detection": convert_object_detection,
}


def convert_annotation(
    annotation: Dict[str, Any], file_id: str, project_id: str
) -> Optional[Dict[str, Any]]:
    """根据 task_type 分发到对应的转换函数。"""
    task_type = annotation.get("task_type")
    if task_type is None and "detections" in annotation:
        task_type = "object_detection"
    converter = TASK_TYPE_CONVERTERS.get(task_type)  # type: ignore[arg-type]
    if converter is None:
        logger.warning("No LS converter for task_type: {}", task_type)
        return None
    try:
        return converter(annotation, file_id, project_id)
    except Exception as exc:
        logger.error("Failed to convert annotation (task_type={}): {}", task_type, exc)
        return None


# ---------------------------------------------------------------------------
# label_config XML 生成
# ---------------------------------------------------------------------------

def _split_labels(raw: str) -> List[str]:
    """逗号分隔字符串 → 去空白列表。"""
    return [s.strip() for s in raw.split(",") if s.strip()]


def generate_label_config_xml(task_type: str, operator_params: Dict[str, Any]) -> str:
    """根据标注类型和算子参数生成 Label Studio label_config XML。"""

    if task_type == "text_classification":
        return _gen_text_classification_xml(operator_params)
    if task_type == "ner":
        return _gen_ner_xml(operator_params)
    if task_type == "relation_extraction":
        return _gen_relation_extraction_xml(operator_params)
    if task_type == "object_detection":
        return _gen_object_detection_xml(operator_params)

    # 未知类型：返回最小可用 XML
    return "<View><Header value=\"Unknown annotation type\"/></View>"


def _gen_text_classification_xml(params: Dict[str, Any]) -> str:
    categories = _split_labels(str(params.get("categories", "正面,负面,中性")))

    view = ET.Element("View")
    ET.SubElement(view, "Text", name="text", value="$text")
    choices = ET.SubElement(
        view,
        "Choices",
        name="sentiment",
        toName="text",
        choice="single",
        showInline="true",
    )
    for cat in categories:
        ET.SubElement(choices, "Choice", value=cat)

    return ET.tostring(view, encoding="unicode")


def _gen_ner_xml(params: Dict[str, Any]) -> str:
    entity_types = _split_labels(str(params.get("entityTypes", "PER,ORG,LOC,DATE")))

    view = ET.Element("View")
    labels = ET.SubElement(view, "Labels", name="label", toName="text")
    for i, et in enumerate(entity_types):
        ET.SubElement(labels, "Label", value=et, background=_pick_color(i))
    ET.SubElement(view, "Text", name="text", value="$text")

    return ET.tostring(view, encoding="unicode")


def _gen_relation_extraction_xml(params: Dict[str, Any]) -> str:
    entity_types = _split_labels(str(params.get("entityTypes", "PER,ORG,LOC")))
    relation_types = _split_labels(
        str(params.get("relationTypes", "属于,位于,创立,工作于"))
    )

    view = ET.Element("View")
    relations = ET.SubElement(view, "Relations")
    for rt in relation_types:
        ET.SubElement(relations, "Relation", value=rt)
    labels = ET.SubElement(view, "Labels", name="label", toName="text")
    for i, et in enumerate(entity_types):
        ET.SubElement(labels, "Label", value=et, background=_pick_color(i))
    ET.SubElement(view, "Text", name="text", value="$text")

    return ET.tostring(view, encoding="unicode")


def _gen_object_detection_xml(params: Dict[str, Any]) -> str:
    detected_labels: List[str] = params.get("_detected_labels", [])
    if not detected_labels:
        detected_labels = ["object"]

    view = ET.Element("View")
    ET.SubElement(view, "Image", name="image", value="$image")
    rect_labels = ET.SubElement(view, "RectangleLabels", name="label", toName="image")
    for i, lbl in enumerate(detected_labels):
        ET.SubElement(rect_labels, "Label", value=lbl, background=_pick_color(i))

    return ET.tostring(view, encoding="unicode")


# ---------------------------------------------------------------------------
# Pipeline 信息提取
# ---------------------------------------------------------------------------

OPERATOR_TASK_TYPE_MAP: Dict[str, str] = {
    "LLMTextClassification": "text_classification",
    "LLMNamedEntityRecognition": "ner",
    "LLMRelationExtraction": "relation_extraction",
    "ImageObjectDetectionBoundingBox": "object_detection",
}


def infer_task_type_from_pipeline(pipeline: List[Dict[str, Any]]) -> Optional[str]:
    """从 normalized pipeline 中推断标注类型（取第一个匹配的算子）。"""
    for step in pipeline:
        operator_id = str(step.get("operator_id", ""))
        task_type = OPERATOR_TASK_TYPE_MAP.get(operator_id)
        if task_type is not None:
            return task_type
    return None


def extract_operator_params(pipeline: List[Dict[str, Any]]) -> Dict[str, Any]:
    """从 normalized pipeline 中提取第一个标注算子的 overrides 参数。"""
    for step in pipeline:
        operator_id = str(step.get("operator_id", ""))
        if operator_id in OPERATOR_TASK_TYPE_MAP:
            return dict(step.get("overrides", {}))
    return {}