import os
import json
import gradio as gr
import huggingface_hub
import numpy as np
import onnxruntime as rt
import pandas as pd
from PIL import Image
from huggingface_hub import login

from translator import translate_texts

# ------------------------------------------------------------------
# 模型配置
# ------------------------------------------------------------------
MODEL_REPO = "SmilingWolf/wd-eva02-large-tagger-v3"
MODEL_FILENAME = "model.onnx"
LABEL_FILENAME = "selected_tags.csv"

HF_TOKEN = os.environ.get("HF_TOKEN", "")
if HF_TOKEN:
    login(token=HF_TOKEN)
else:
    print("⚠️ 未检测到 HF_TOKEN，私有模型可能下载失败")

# ------------------------------------------------------------------
# Tagger 类 (全局实例化)
# ------------------------------------------------------------------
class Tagger:
    def __init__(self):
        self.hf_token = HF_TOKEN
        self.tag_names = []
        self.categories = {}
        self.model = None
        self.input_size = 0
        self._load_model_and_labels()

    def _load_model_and_labels(self):
        try:
            label_path = huggingface_hub.hf_hub_download(
                MODEL_REPO, LABEL_FILENAME, token=self.hf_token, resume_download=True
            )
            model_path = huggingface_hub.hf_hub_download(
                MODEL_REPO, MODEL_FILENAME, token=self.hf_token, resume_download=True
            )

            tags_df = pd.read_csv(label_path)
            self.tag_names = tags_df["name"].tolist()
            self.categories = {
                "rating": np.where(tags_df["category"] == 9)[0],
                "general": np.where(tags_df["category"] == 0)[0],
                "character": np.where(tags_df["category"] == 4)[0],
            }
            self.model = rt.InferenceSession(model_path)
            self.input_size = self.model.get_inputs()[0].shape[1]
            print("✅ 模型和标签加载成功")
        except Exception as e:
            print(f"❌ 模型或标签加载失败: {e}")
            raise RuntimeError(f"模型初始化失败: {e}")


    # ------------------------- preprocess -------------------------
    def _preprocess(self, img: Image.Image) -> np.ndarray:
        if img is None:
            raise ValueError("输入图像不能为空")
        if img.mode != "RGB":
            img = img.convert("RGB")
        size = max(img.size)
        canvas = Image.new("RGB", (size, size), (255, 255, 255))
        canvas.paste(img, ((size - img.width) // 2, (size - img.height) // 2))
        if size != self.input_size:
            canvas = canvas.resize((self.input_size, self.input_size), Image.BICUBIC)
        return np.array(canvas)[:, :, ::-1].astype(np.float32)  # to BGR

    # --------------------------- predict --------------------------
    def predict(self, img: Image.Image, gen_th: float = 0.35, char_th: float = 0.85):
        if self.model is None:
            raise RuntimeError("模型未成功加载，无法进行预测。")
        inp_name = self.model.get_inputs()[0].name
        outputs = self.model.run(None, {inp_name: self._preprocess(img)[None, ...]})[0][0]

        res = {"ratings": {}, "general": {}, "characters": {}}
        tag_categories_for_translation = {"ratings": [], "general": [], "characters": []}

        for idx in self.categories["rating"]:
            tag_name = self.tag_names[idx].replace("_", " ")
            res["ratings"][tag_name] = float(outputs[idx])
            tag_categories_for_translation["ratings"].append(tag_name)

        for idx in self.categories["general"]:
            if outputs[idx] > gen_th:
                tag_name = self.tag_names[idx].replace("_", " ")
                res["general"][tag_name] = float(outputs[idx])
                tag_categories_for_translation["general"].append(tag_name)

        for idx in self.categories["character"]:
            if outputs[idx] > char_th:
                tag_name = self.tag_names[idx].replace("_", " ")
                res["characters"][tag_name] = float(outputs[idx])
                tag_categories_for_translation["characters"].append(tag_name)


        res["general"] = dict(sorted(res["general"].items(), key=lambda kv: kv[1], reverse=True))
        res["characters"] = dict(sorted(res["characters"].items(), key=lambda kv: kv[1], reverse=True))
        res["ratings"] = dict(sorted(res["ratings"].items(), key=lambda kv: kv[1], reverse=True))


        tag_categories_for_translation["general"] = list(res["general"].keys())
        tag_categories_for_translation["characters"] = list(res["characters"].keys())
        tag_categories_for_translation["ratings"] = list(res["ratings"].keys())

        return res, tag_categories_for_translation

# 全局 Tagger 实例
try:
    tagger_instance = Tagger()
except RuntimeError as e:
    print(f"应用启动时Tagger初始化失败: {e}")
    tagger_instance = None # 允许应用启动，但在处理时会失败

# ------------------------------------------------------------------
# Gradio UI
# ------------------------------------------------------------------
custom_css = """
.label-container {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 5px;
    background-color: #f9f9f9;
}
.tag-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 2px 0;
    padding: 2px 5px;
    border-radius: 3px;
    background-color: #fff;
    transition: background-color 0.2s;
}
.tag-item:hover {
    background-color: #f0f0f0;
}
.tag-en {
    font-weight: bold;
    color: #333;
    cursor: pointer; /* Indicates clickable */
}
.tag-zh {
    color: #666;
    margin-left: 10px;
}
.tag-score {
    color: #999;
    font-size: 0.9em;
}
.btn-analyze-container { /* Custom class for analyze button container */
    margin-top: 15px;
    margin-bottom: 15px;
}
"""

_js_functions = """
function copyToClipboard(text) {
    // --- 调试信息 ---
    console.log('copyToClipboard function was called.');
    console.log('Received text:', text);
    // console.trace(); // 如果需要更详细的调用栈信息，可以取消这行注释

    // --- 保护性检查 ---
    // 如果 text 未定义或为 null，则不执行后续操作，并打印警告
    if (typeof text === 'undefined' || text === null) {
        console.warn('copyToClipboard was called with undefined or null text. Aborting this specific copy operation.');
        // 在这种情况下，我们不应该尝试复制，也不应该显示“已复制”的提示
        return;
    }

    navigator.clipboard.writeText(text).then(() => {
        // console.log('Tag copied to clipboard: ' + text); // 成功复制的日志（可选）
        const feedback = document.createElement('div');
        
        // 确保 text 是字符串类型，再进行 substring 操作
        let displayText = String(text); // 将 text 转换为字符串以防万一
        displayText = displayText.substring(0, 30) + (displayText.length > 30 ? '...' : '');
        
        feedback.textContent = '已复制: ' + displayText;
        feedback.style.position = 'fixed';
        feedback.style.bottom = '20px';
        feedback.style.left = '50%';
        feedback.style.transform = 'translateX(-50%)';
        feedback.style.backgroundColor = '#4CAF50';
        feedback.style.color = 'white';
        feedback.style.padding = '10px 20px';
        feedback.style.borderRadius = '5px';
        feedback.style.zIndex = '10000';
        feedback.style.transition = 'opacity 0.5s ease-out';
        document.body.appendChild(feedback);
        setTimeout(() => {
            feedback.style.opacity = '0';
            setTimeout(() => {
                if (document.body.contains(feedback)) { // 确保元素还在DOM中
                    document.body.removeChild(feedback);
                }
            }, 500);
        }, 1500);
    }).catch(err => {
        console.error('Failed to copy tag. Error:', err, 'Attempted to copy text:', text);
        // 可以考虑也给用户一个错误提示，但原版 alert 可能体验不佳
        // alert('复制失败: ' + err); 
        const errorFeedback = document.createElement('div');
        errorFeedback.textContent = '复制操作失败!'; // 更友好的错误提示
        errorFeedback.style.position = 'fixed';
        errorFeedback.style.bottom = '20px';
        errorFeedback.style.left = '50%';
        errorFeedback.style.transform = 'translateX(-50%)';
        errorFeedback.style.backgroundColor = '#D32F2F'; // 红色背景表示错误
        errorFeedback.style.color = 'white';
        errorFeedback.style.padding = '10px 20px';
        errorFeedback.style.borderRadius = '5px';
        errorFeedback.style.zIndex = '10000';
        errorFeedback.style.transition = 'opacity 0.5s ease-out';
        document.body.appendChild(errorFeedback);
        setTimeout(() => {
            errorFeedback.style.opacity = '0';
            setTimeout(() => {
                if (document.body.contains(errorFeedback)) {
                    document.body.removeChild(errorFeedback);
                }
            }, 500);
        }, 2500);
    });
}
"""

with gr.Blocks(theme=gr.themes.Soft(), title="AI 图像标签分析器", css=custom_css, js=_js_functions) as demo:
    gr.Markdown("# 🖼️ AI 图像标签分析器")
    gr.Markdown("上传图片自动识别标签，支持中英文显示和一键复制。[NovelAI在线绘画](https://nai.idlecloud.cc/)")

    state_res = gr.State({})
    state_translations_dict = gr.State({})
    state_tag_categories_for_translation = gr.State({})


    with gr.Row():
        with gr.Column(scale=1):
            img_in = gr.Image(type="pil", label="上传图片", height=300)
            
            btn = gr.Button("🚀 开始分析", variant="primary", elem_classes=["btn-analyze-container"])
            
            with gr.Accordion("⚙️ 高级设置", open=False):
                gen_slider = gr.Slider(0, 1, value=0.35, step=0.01, label="通用标签阈值", info="越高 → 标签更少更准")
                char_slider = gr.Slider(0, 1, value=0.85, step=0.01, label="角色标签阈值", info="推荐保持较高阈值")
                show_tag_scores = gr.Checkbox(True, label="在列表中显示标签置信度")
            
            with gr.Accordion("📊 标签汇总设置", open=True):
                gr.Markdown("选择要包含在下方汇总文本框中的标签类别：")
                with gr.Row():
                    sum_general = gr.Checkbox(True, label="通用标签", min_width=50)
                    sum_char = gr.Checkbox(True, label="角色标签", min_width=50)
                    sum_rating = gr.Checkbox(False, label="评分标签", min_width=50)
                sum_sep = gr.Dropdown(["逗号", "换行", "空格"], value="逗号", label="标签之间的分隔符")
                sum_show_zh = gr.Checkbox(False, label="在汇总中显示中文翻译")

            processing_info = gr.Markdown("", visible=False)

        with gr.Column(scale=2):
            with gr.Tabs():
                with gr.TabItem("🏷️ 通用标签"):
                    out_general = gr.HTML(label="General Tags")
                with gr.TabItem("👤 角色标签"):
                    gr.Markdown("<p style='color:gray; font-size:small;'>提示：角色标签推测基于截至2024年2月的数据。</p>")
                    out_char = gr.HTML(label="Character Tags")
                with gr.TabItem("⭐ 评分标签"):
                    out_rating = gr.HTML(label="Rating Tags")
            
            gr.Markdown("### 标签汇总结果")
            out_summary = gr.Textbox(
                label="标签汇总",
                placeholder="分析完成后，此处将显示汇总的英文标签...",
                lines=5,
                show_copy_button=True
            )

    # ----------------- 辅助函数 -----------------
    def format_tags_html(tags_dict, translations_list, category_name, show_scores=True, show_translation_in_list=True):
        if not tags_dict:
            return "<p>暂无标签</p>"
        
        html = '<div class="label-container">'
        
        if not isinstance(translations_list, list):
            translations_list = []

        tag_keys = list(tags_dict.keys())

        for i, tag in enumerate(tag_keys):
            score = tags_dict[tag]
            escaped_tag = tag.replace("'", "\\'") # Escape for JS
            
            html += '<div class="tag-item">'
            tag_display_html = f'<span class="tag-en" onclick="copyToClipboard(\'{escaped_tag}\')">{tag}</span>'
            
            if show_translation_in_list and i < len(translations_list) and translations_list[i]:
                tag_display_html += f'<span class="tag-zh">({translations_list[i]})</span>'
            
            html += f'<div>{tag_display_html}</div>'
            if show_scores:
                html += f'<span class="tag-score">{score:.3f}</span>'
            html += '</div>'
        html += '</div>'
        return html

    def generate_summary_text_content(
        current_res, current_translations_dict,
        s_gen, s_char, s_rat, s_sep_type, s_show_zh
    ):
        if not current_res:
            return "请先分析图像或选择要汇总的标签类别。"

        summary_parts = []
        separators = {"逗号": ", ", "换行": "\n", "空格": " "}
        separator = separators.get(s_sep_type, ", ")

        categories_to_summarize = []
        if s_gen: categories_to_summarize.append("general")
        if s_char: categories_to_summarize.append("characters")
        if s_rat: categories_to_summarize.append("ratings")

        if not categories_to_summarize:
            return "请至少选择一个标签类别进行汇总。"

        for cat_key in categories_to_summarize:
            if current_res.get(cat_key):
                tags_to_join = []
                cat_tags_en = list(current_res[cat_key].keys())
                cat_translations = current_translations_dict.get(cat_key, [])

                for i, en_tag in enumerate(cat_tags_en):
                    if s_show_zh and i < len(cat_translations) and cat_translations[i]:
                        tags_to_join.append(f"{en_tag}({cat_translations[i]})")
                    else:
                        tags_to_join.append(en_tag)
                if tags_to_join: # only add if there are tags for this category
                     summary_parts.append(separator.join(tags_to_join))
        
        # Join parts with double newline for readability if multiple categories present and separator is not newline
        joiner = "\n\n" if separator != "\n" and len(summary_parts) > 1 else separator if separator == "\n" else " "
        
        final_summary = joiner.join(summary_parts)
        return final_summary if final_summary else "选定的类别中没有找到标签。"


    # ----------------- 主要处理回调 -----------------
    def process_image_and_generate_outputs(
        img, g_th, c_th, s_scores, # Main inputs
        s_gen, s_char, s_rat, s_sep, s_zh_in_sum
        ):
        if img is None:
            yield (
                gr.update(interactive=True, value="🚀 开始分析"),
                gr.update(visible=True, value="❌ 请先上传图片。"),
                "", "", "", "",
                gr.update(placeholder="请先上传图片并开始分析..."),
                {}, {}, {} 
            )
            return
        
        if tagger_instance is None:
            yield (
                gr.update(interactive=True, value="🚀 开始分析"),
                gr.update(visible=True, value="❌ 分析器未成功初始化，请检查控制台错误。"),
                "", "", "", "",
                gr.update(placeholder="分析器初始化失败..."),
                {}, {}, {}
            )
            return

        yield (
            gr.update(interactive=False, value="🔄 处理中..."),
            gr.update(visible=True, value="🔄 正在分析图像，请稍候..."),
            gr.HTML(value="<p>分析中...</p>"), # General
            gr.HTML(value="<p>分析中...</p>"), # Character
            gr.HTML(value="<p>分析中...</p>"), # Rating
            gr.update(value="分析中，请稍候..."), # Summary
            {}, {}, {} # Clear states initially
        )
        
        try:
            # 1. Predict tags
            res, tag_categories_original_order = tagger_instance.predict(img, g_th, c_th)

            all_tags_to_translate = []
            for cat_key in ["general", "characters", "ratings"]:
                all_tags_to_translate.extend(tag_categories_original_order.get(cat_key, []))
            
            all_translations_flat = []
            if all_tags_to_translate:
                all_translations_flat = translate_texts(all_tags_to_translate, src_lang="auto", tgt_lang="zh")
            
            current_translations_dict = {}
            offset = 0
            for cat_key in ["general", "characters", "ratings"]:
                cat_original_tags = tag_categories_original_order.get(cat_key, [])
                num_tags_in_cat = len(cat_original_tags)
                if num_tags_in_cat > 0:
                    current_translations_dict[cat_key] = all_translations_flat[offset : offset + num_tags_in_cat]
                    offset += num_tags_in_cat
                else:
                    current_translations_dict[cat_key] = []
            
            general_html = format_tags_html(res.get("general", {}), current_translations_dict.get("general", []), "general", s_scores, True)
            char_html = format_tags_html(res.get("characters", {}), current_translations_dict.get("characters", []), "characters", s_scores, True)
            rating_html = format_tags_html(res.get("ratings", {}), current_translations_dict.get("ratings", []), "ratings", s_scores, True)

            summary_text = generate_summary_text_content(
                res, current_translations_dict,
                s_gen, s_char, s_rat, s_sep, s_zh_in_sum 
            )

            yield (
                gr.update(interactive=True, value="🚀 开始分析"),
                gr.update(visible=True, value="✅ 分析完成!"), 
                general_html,
                char_html,
                rating_html,
                gr.update(value=summary_text),
                res,
                current_translations_dict,
                tag_categories_original_order
            )
            
        except Exception as e:
            import traceback
            tb_str = traceback.format_exc()
            print(f"处理时发生错误: {e}\n{tb_str}")
            yield (
                gr.update(interactive=True, value="🚀 开始分析"),
                gr.update(visible=True, value=f"❌ 处理失败: {str(e)}"),
                "<p>处理出错</p>", "<p>处理出错</p>", "<p>处理出错</p>",
                gr.update(value=f"错误: {str(e)}", placeholder="分析失败..."),
                {}, {}, {}
            )

    # ----------------- 更新汇总文本的回调 -----------------
    def update_summary_display(
        s_gen, s_char, s_rat, s_sep, s_zh_in_sum,
        current_res_from_state, current_translations_from_state
    ):
        if not current_res_from_state:
            return gr.update(placeholder="请先完成一次图像分析以生成汇总。", value="")

        new_summary_text = generate_summary_text_content(
            current_res_from_state, current_translations_from_state,
            s_gen, s_char, s_rat, s_sep, s_zh_in_sum
        )
        return gr.update(value=new_summary_text)

    # ----------------- 绑定事件 -----------------
    btn.click(
        process_image_and_generate_outputs,
        inputs=[
            img_in, gen_slider, char_slider, show_tag_scores,
            sum_general, sum_char, sum_rating, sum_sep, sum_show_zh
        ],
        outputs=[
            btn, processing_info,
            out_general, out_char, out_rating,
            out_summary,
            state_res, state_translations_dict, state_tag_categories_for_translation
        ],
        # show_progress="full" # Gradio's built-in progress
    )

    summary_controls = [sum_general, sum_char, sum_rating, sum_sep, sum_show_zh]
    for ctrl in summary_controls:
        ctrl.change(
            fn=update_summary_display,
            inputs=summary_controls + [state_res, state_translations_dict],
            outputs=[out_summary],
            # show_progress=False # Typically fast, no need for progress indicator
        )
    
# ------------------------------------------------------------------
# 启动
# ------------------------------------------------------------------
if __name__ == "__main__":
    if tagger_instance is None:
        print("CRITICAL: Tagger 未能初始化，应用功能将受限。请检查之前的错误信息。")
    demo.launch(server_name="0.0.0.0", server_port=7860)