#!/usr/bin/env python3
"""
单个 Prompt 测试 Pipeline

完整流程:
1. 接受用户的设计文本描述
2. 调用 GPT 生成房间规格和物体列表
3. 检索 3D assets (OpenShape)
4. 使用 LayoutVLM 优化布局
5. 使用高质量 Blender 渲染可视化

使用方法:
  # 完整流程
  python run_single_prompt.py --prompt "A cozy bedroom with..." --output results/my_test

  # 仅生成布局 (跳过渲染)
  python run_single_prompt.py --prompt "..." --output results/my_test --skip-render

  # 从已有 scene_config 继续
  python run_single_prompt.py --scene-config results/my_test/scene_config.json --output results/my_test

  # 仅渲染 (已有 layout.json)
  python run_single_prompt.py --output results/my_test --render-only
"""

import os
import json
import math
import argparse
import collections
import subprocess
import sys
import re
from typing import Dict, List, Any, Optional
from pathlib import Path


# ============================================================================
# Azure OpenAI Setup
# ============================================================================

def setup_azure_client():
    """设置 Azure OpenAI 客户端"""
    from openai import AzureOpenAI
    from azure.identity import ChainedTokenCredential, AzureCliCredential, ManagedIdentityCredential, get_bearer_token_provider
    
    scope = "api://trapi/.default"
    credential = get_bearer_token_provider(ChainedTokenCredential(
        AzureCliCredential(),
        ManagedIdentityCredential(),
    ), scope)
    
    api_version = '2024-12-01-preview'
    instance = 'msra/shared'
    endpoint = f'https://trapi.research.microsoft.com/{instance}'
    
    return AzureOpenAI(
        azure_endpoint=endpoint,
        azure_ad_token_provider=credential,
        api_version=api_version,
    )


# ============================================================================
# Step 1: 生成房间规格
# ============================================================================

def generate_room_specification(client, user_description: str, model_name: str = 'gpt-4o_2024-11-20') -> Dict:
    """根据用户描述生成房间规格和布局标准"""
    prompt = f"""
Given a user's room description, return a JSON object containing:
1. task_description: A concise summary of the room
2. room_size: Realistic dimensions in meters (width, length, height)
3. layout_criteria: Detailed layout requirements

User's description: {user_description}

Return only the JSON object. Example format:
{{
    "task_description": "a bright open-plan dining room with...",
    "room_size": {{
        "width": 6.0,
        "length": 8.0,
        "height": 3.0,
        "area": 48.0
    }},
    "layout_criteria": "The layout criteria should..."
}}
"""
    
    response = client.chat.completions.create(
        model=model_name,
        messages=[
            {"role": "system", "content": "You are an expert interior designer. Always return valid JSON format."},
            {"role": "user", "content": prompt},
        ],
        temperature=1.0,
    )
    
    content = response.choices[0].message.content
    json_match = re.search(r'\{.*\}', content, re.DOTALL)
    if json_match:
        return json.loads(json_match.group(0))
    raise ValueError(f"Failed to parse JSON: {content}")


# ============================================================================
# Step 2: 生成物体列表
# ============================================================================

def generate_object_list(client, task_description: str, layout_criteria: str, 
                        room_size: Dict, model_name: str = "gpt-4o_2024-11-20") -> Dict:
    """根据任务描述生成物体列表"""
    room_size_str = f"{room_size['width']}m x {room_size['length']}m"
    
    prompt = f"""
Given a room description and layout criteria, generate a comprehensive list of objects.

Requirements:
1. Object names: 2-3 words, specific (e.g., "wooden chair", "desk lamp")
2. Use singular form (e.g., "chair" not "chairs")
3. Include 10-20 relevant objects
4. Each object needs count, types, and description for 3D asset retrieval

Task description: {task_description}
Layout criteria: {layout_criteria}
Room size: {room_size_str}

Return JSON format like:
{{
  "dining_table": {{
    "count": 1,
    "types": 1,
    "description": "A rectangular wooden dining table with sturdy legs, seats 4-6 people"
  }},
  "dining_chair": {{
    "count": 6,
    "types": 1,
    "description": "An upholstered dining chair with padded seat and backrest"
  }}
}}

Return only the JSON object.
"""
    
    response = client.chat.completions.create(
        model=model_name,
        messages=[
            {"role": "system", "content": "You are an expert interior designer generating object lists. Always return valid JSON."},
            {"role": "user", "content": prompt},
        ],
        temperature=1.0,
    )
    
    content = response.choices[0].message.content
    json_match = re.search(r'\{.*\}', content, re.DOTALL)
    if json_match:
        return json.loads(json_match.group(0))
    raise ValueError(f"Failed to parse object list JSON: {content}")


# ============================================================================
# Step 3: 检索 3D Assets (OpenShape)
# ============================================================================

# 全局缓存
_CLIP_MODEL_CACHE = None
_OPENSHAPE_DATA_CACHE = None

def load_openclip_model():
    """加载 CLIP 模型"""
    global _CLIP_MODEL_CACHE
    if _CLIP_MODEL_CACHE is not None:
        return _CLIP_MODEL_CACHE
    
    import torch
    import transformers
    
    print("   加载 CLIP 模型...")
    half = torch.float16 if torch.cuda.is_available() else torch.bfloat16
    
    clip_model = transformers.CLIPModel.from_pretrained(
        "laion/CLIP-ViT-bigG-14-laion2B-39B-b160k",
        low_cpu_mem_usage=True, 
        torch_dtype=half,
        offload_state_dict=True,
    )
    clip_prep = transformers.CLIPProcessor.from_pretrained(
        "laion/CLIP-ViT-bigG-14-laion2B-39B-b160k"
    )
    
    if torch.cuda.is_available():
        clip_model.cuda()
    
    _CLIP_MODEL_CACHE = (clip_model, clip_prep)
    return clip_model, clip_prep


def load_openshape_embeddings():
    """加载 OpenShape embeddings"""
    global _OPENSHAPE_DATA_CACHE
    if _OPENSHAPE_DATA_CACHE is not None:
        return _OPENSHAPE_DATA_CACHE
    
    import torch
    from huggingface_hub import hf_hub_download
    
    print("   加载 OpenShape embeddings...")
    
    meta = json.load(open(hf_hub_download(
        "OpenShape/openshape-objaverse-embeddings", 
        "objaverse_meta.json", token=True, repo_type='dataset', 
        local_dir="OpenShape-Embeddings"
    )))
    meta = {x['u']: x for x in meta['entries']}
    
    deser = torch.load(hf_hub_download(
        "OpenShape/openshape-objaverse-embeddings", 
        "objaverse.pt", token=True, repo_type='dataset', 
        local_dir="OpenShape-Embeddings"
    ), map_location='cpu')
    
    _OPENSHAPE_DATA_CACHE = (meta, deser['us'], deser['feats'])
    return _OPENSHAPE_DATA_CACHE


def retrieve_single_object(description: str, top: int = 5, sim_th: float = 0.1, 
                          face_max: int = 100000, asset_dir: str = None) -> List[Dict]:
    """使用 OpenShape 检索单个物体"""
    import torch
    from torch.nn import functional as F
    
    clip_model, clip_prep = load_openclip_model()
    meta, us, feats = load_openshape_embeddings()
    
    text = re.sub(r'\d', '', description).replace("_", " ")
    device = clip_model.device
    
    tn = clip_prep(text=[text], return_tensors='pt', truncation=True, max_length=76).to(device)
    
    with torch.no_grad():
        enc = clip_model.get_text_features(**tn).float().cpu()
    
    sims = []
    embedding = F.normalize(enc.detach().cpu(), dim=-1).squeeze()
    
    for chunk in torch.split(feats, 10240):
        sims.append(embedding @ F.normalize(chunk.float(), dim=-1).T)
    
    sims = torch.cat(sims)
    sims, idx = torch.sort(sims, descending=True)
    
    sim_mask = sims > sim_th
    sims, idx = sims[sim_mask], idx[sim_mask]
    
    results = []
    available_assets = set(os.listdir(asset_dir)) if asset_dir and os.path.exists(asset_dir) else None
    
    for i, sim in zip(idx, sims):
        uid = us[i]
        if uid not in meta:
            continue
        obj_meta = meta[uid]
        if obj_meta['faces'] > face_max:
            continue
        if available_assets and uid not in available_assets:
            continue
        
        results.append({
            'uid': uid,
            'similarity': float(sim),
            'name': obj_meta['name'],
            'faces': obj_meta['faces'],
        })
        
        if len(results) >= top:
            break
    
    return results


def retrieve_3d_assets(object_list: Dict, asset_dir: str) -> Dict:
    """为每个物体检索 3D asset"""
    print("\n🔍 检索 3D Assets...")
    
    assets = {}
    
    for obj_name, obj_info in object_list.items():
        description = obj_info.get("description", obj_name)
        count = obj_info.get("count", 1)
        types_needed = obj_info.get("types", 1)
        
        print(f"   检索: {obj_name} ({count}个)")
        
        try:
            candidates = retrieve_single_object(
                description, top=max(10, types_needed * 3),
                sim_th=0.1, face_max=100000, asset_dir=asset_dir
            )
            
            if not candidates:
                print(f"      ⚠️ 未找到匹配")
                continue
            
            selected = candidates[:types_needed]
            print(f"      ✓ 找到: {selected[0]['name']} (sim={selected[0]['similarity']:.3f})")
            
            for type_idx, asset_info in enumerate(selected):
                for instance_idx in range(count):
                    key = f"{asset_info['uid']}-{instance_idx}"
                    assets[key] = {}
        
        except Exception as e:
            print(f"      ⚠️ 检索失败: {e}")
    
    print(f"✅ 共检索 {len(assets)} 个 assets")
    return assets


# ============================================================================
# Step 4: 生成 Scene JSON
# ============================================================================

def generate_scene_json(task_description: str, layout_criteria: str, 
                       room_size: Dict, assets: Dict, user_input: str) -> Dict:
    """生成完整的 scene JSON"""
    width = room_size['width']
    length = room_size['length']
    height = room_size.get('height', 2.8)
    
    return {
        "user_input": user_input,
        "task_description": task_description,
        "layout_criteria": layout_criteria,
        "boundary": {
            "floor_vertices": [
                [0, 0, 0],
                [width, 0, 0],
                [width, length, 0],
                [0, length, 0]
            ],
            "wall_height": height
        },
        "assets": assets
    }


# ============================================================================
# Step 5: 准备 Assets 并运行 LayoutVLM
# ============================================================================

def prepare_task_assets(task: Dict, asset_dir: str) -> Dict:
    """准备 assets 元数据"""
    if "layout_criteria" not in task:
        task["layout_criteria"] = "the layout should follow the task description"

    all_data = collections.defaultdict(list)
    
    for original_uid in task["assets"].keys():
        uid = '-'.join(original_uid.split('-')[:-1])
        data_path = os.path.join(asset_dir, uid, "data.json")
        
        if not os.path.exists(data_path):
            continue
            
        with open(data_path, "r") as f:
            data = json.load(f)
        data['path'] = os.path.join(asset_dir, uid, f"{uid}.glb")
        all_data[uid].append(data)

    category_count = collections.defaultdict(int)
    for uid, duplicated_assets in all_data.items():
        if not duplicated_assets:
            continue
        category_var_name = duplicated_assets[0]['annotations']['category']
        category_var_name = category_var_name.replace('-', "_").replace(" ", "_").replace("'", "_").replace("/", "_").replace(",", "_").lower()
        category_count[category_var_name] += 1

    task["assets"] = {}
    category_idx = collections.defaultdict(int)
    
    for uid, duplicated_assets in all_data.items():
        if not duplicated_assets:
            continue
        category_var_name = duplicated_assets[0]['annotations']['category']
        category_var_name = category_var_name.replace('-', "_").replace(" ", "_").replace("'", "_").replace("/", "_").replace(",", "_").lower()
        category_idx[category_var_name] += 1
        
        for instance_idx, data in enumerate(duplicated_assets):
            category_var_name_final = f"{category_var_name}_{chr(ord('A') + category_idx[category_var_name]-1)}" if category_count[category_var_name] > 1 else category_var_name
            var_name = f"{category_var_name_final}_{instance_idx}" if len(duplicated_assets) > 1 else category_var_name_final
            
            task["assets"][f"{category_var_name_final}-{instance_idx}"] = {
                "uid": uid,
                "count": len(duplicated_assets),
                "instance_var_name": var_name,
                "asset_var_name": category_var_name_final,
                "instance_idx": instance_idx,
                "annotations": data["annotations"],
                "category": data["annotations"]["category"],
                'description': data['annotations']['description'],
                'path': data['path'],
                'onCeiling': data['annotations'].get('onCeiling', False),
                'onFloor': data['annotations'].get('onFloor', True),
                'onWall': data['annotations'].get('onWall', False),
                'onObject': data['annotations'].get('onObject', False),
                'frontView': data['annotations'].get('frontView', ""),
                'assetMetadata': {
                    "boundingBox": {
                        "x": float(data['assetMetadata']['boundingBox']['y']),
                        "y": float(data['assetMetadata']['boundingBox']['x']),
                        "z": float(data['assetMetadata']['boundingBox']['z'])
                    },
                }
            }

    return task


def run_layoutvlm(scene_config: Dict, save_dir: str, max_retries: int = 5) -> Dict:
    """运行 LayoutVLM 优化布局，失败时自动重试"""
    from src.layoutvlm.layoutvlm import LayoutVLM
    
    print(f"\n🔧 运行 LayoutVLM (最多重试 {max_retries} 次)...")
    
    last_error = None
    for attempt in range(1, max_retries + 1):
        try:
            print(f"   尝试 {attempt}/{max_retries}...")
            
            layout_solver = LayoutVLM(
                mode="one_shot",
                save_dir=save_dir,
                asset_source="objaverse"
            )
            
            layout = layout_solver.solve(scene_config)
            
            layout_path = os.path.join(save_dir, 'layout.json')
            with open(layout_path, 'w') as f:
                json.dump(layout, f, indent=2)
            
            print(f"✅ 布局已保存: {layout_path}")
            return layout
            
        except Exception as e:
            last_error = e
            print(f"   ⚠️ 尝试 {attempt} 失败: {str(e)[:100]}")
            if attempt < max_retries:
                print(f"   🔄 重试中...")
    
    raise RuntimeError(f"LayoutVLM 在 {max_retries} 次尝试后仍然失败: {last_error}")


# ============================================================================
# Step 6: 高质量 Blender 渲染
# ============================================================================

def render_with_blender(scene_config: Dict, layout: Dict, save_dir: str, asset_dir: str,
                        views: List[str] = ['topdown', 'diagonal'],
                        engine: str = 'CYCLES', samples: int = 256,
                        width: int = 1600, height: int = 900) -> List[str]:
    """使用高质量 Blender 渲染"""
    print("\n🎨 Blender 渲染...")
    
    # 构建场景对象
    scene_objects = []
    
    for key, transform in layout.items():
        if key not in scene_config['assets']:
            continue
        
        asset_info = scene_config['assets'][key]
        
        # 转换旋转 (弧度 -> 度)
        rot_rad = transform.get('rotation', [0, 0, 0])
        rot_deg = [math.degrees(r) for r in rot_rad]
        
        # 获取尺寸
        bbox = asset_info['assetMetadata']['boundingBox']
        size = [bbox['x'], bbox['y'], bbox['z']]
        
        scene_objects.append({
            'id': key,
            'model_id': asset_info['uid'],
            'category': asset_info['category'],
            'position': transform.get('position', [0, 0, 0]),
            'rotation': rot_deg,
            'size': size
        })
    
    scene_for_viz = {
        'boundary': scene_config.get('boundary', {}).get('floor_vertices', []),
        'assets': scene_objects
    }
    
    # 保存临时场景文件
    temp_scene_path = os.path.join(save_dir, '_temp_scene.json')
    with open(temp_scene_path, 'w') as f:
        json.dump(scene_for_viz, f, indent=2)
    
    output_files = []
    
    for view in views:
        output_path = os.path.join(save_dir, f'render_{view}.png')
        
        cmd = [
            'python', 'visualize_blender_hq.py',
            '--scene_path', temp_scene_path,
            '--output', output_path,
            '--asset_dir', asset_dir,
            '--view', view,
            '--engine', engine,
            '--samples', str(samples),
            '--width', str(width),
            '--height', str(height),
            '--fill-lights',
            '--auto-crop',
        ]
        
        print(f"   渲染 {view} 视角...")
        
        try:
            result = subprocess.run(cmd, capture_output=True, text=True, timeout=600)
            if result.returncode == 0:
                output_files.append(output_path)
                print(f"   ✅ {view}: {output_path}")
            else:
                print(f"   ⚠️ {view} 渲染失败: {result.stderr[:200]}")
        except subprocess.TimeoutExpired:
            print(f"   ⚠️ {view} 渲染超时")
        except Exception as e:
            print(f"   ⚠️ {view} 渲染异常: {e}")
    
    # 清理临时文件
    if os.path.exists(temp_scene_path):
        os.remove(temp_scene_path)
    
    return output_files


# ============================================================================
# Main Pipeline
# ============================================================================

def run_pipeline(prompt: str, output_dir: str, asset_dir: str,
                scene_config_path: Optional[str] = None,
                skip_render: bool = False,
                render_only: bool = False,
                render_engine: str = 'CYCLES',
                render_samples: int = 256,
                render_width: int = 1600,
                render_height: int = 900,
                render_views: List[str] = ['topdown', 'diagonal']) -> Dict:
    """
    完整的 Pipeline
    
    Args:
        prompt: 用户设计描述
        output_dir: 输出目录
        asset_dir: 3D assets 目录
        scene_config_path: 已有的 scene_config.json 路径 (可选)
        skip_render: 跳过渲染
        render_only: 仅渲染 (需要已有 layout.json)
        
    Returns:
        结果字典
    """
    os.makedirs(output_dir, exist_ok=True)
    
    result = {
        'prompt': prompt,
        'output_dir': output_dir,
        'success': False,
    }
    
    # 保存原始 prompt
    with open(os.path.join(output_dir, 'user_input.txt'), 'w') as f:
        f.write(prompt)
    
    layout_path = os.path.join(output_dir, 'layout.json')
    scene_config_save_path = os.path.join(output_dir, 'scene_config.json')
    
    # ==================== 仅渲染模式 ====================
    if render_only:
        print("🎨 仅渲染模式...")
        
        if not os.path.exists(layout_path):
            raise FileNotFoundError(f"layout.json not found: {layout_path}")
        if not os.path.exists(scene_config_save_path):
            raise FileNotFoundError(f"scene_config.json not found: {scene_config_save_path}")
        
        with open(layout_path, 'r') as f:
            layout = json.load(f)
        with open(scene_config_save_path, 'r') as f:
            scene_config = json.load(f)
        
        scene_config = prepare_task_assets(scene_config, asset_dir)
        
        render_files = render_with_blender(
            scene_config, layout, output_dir, asset_dir,
            views=render_views, engine=render_engine,
            samples=render_samples, width=render_width, height=render_height
        )
        
        result['render_files'] = render_files
        result['success'] = True
        return result
    
    # ==================== 从已有 scene_config 继续 ====================
    if scene_config_path and os.path.exists(scene_config_path):
        print(f"📂 从已有 scene_config 继续: {scene_config_path}")
        with open(scene_config_path, 'r') as f:
            scene_json = json.load(f)
    else:
        # ==================== 完整流程 ====================
        print("=" * 60)
        print("🚀 启动 Pipeline")
        print("=" * 60)
        print(f"📝 Prompt: {prompt[:100]}...")
        print()
        
        # Step 1: Azure 客户端
        print("Step 1: 设置 Azure OpenAI...")
        client = setup_azure_client()
        print("✅ 完成\n")
        
        # Step 2: 生成房间规格
        print("Step 2: 生成房间规格...")
        room_spec = generate_room_specification(client, prompt)
        print(f"   任务: {room_spec['task_description']}")
        print(f"   尺寸: {room_spec['room_size']}")
        print()
        
        # Step 3: 生成物体列表
        print("Step 3: 生成物体列表...")
        object_list = generate_object_list(
            client, 
            room_spec['task_description'],
            room_spec['layout_criteria'],
            room_spec['room_size']
        )
        print(f"   生成了 {len(object_list)} 种物体")
        for obj_name in list(object_list.keys())[:5]:
            print(f"   - {obj_name}: {object_list[obj_name]['count']}个")
        print()
        
        # Step 4: 检索 3D Assets
        print("Step 4: 检索 3D Assets...")
        assets = retrieve_3d_assets(object_list, asset_dir)
        
        # Step 5: 生成 Scene JSON
        print("\nStep 5: 生成 Scene JSON...")
        scene_json = generate_scene_json(
            room_spec['task_description'],
            room_spec['layout_criteria'],
            room_spec['room_size'],
            assets,
            prompt
        )
        
        with open(scene_config_save_path, 'w') as f:
            json.dump(scene_json, f, indent=2)
        print(f"   保存: {scene_config_save_path}")
    
    # Step 6: LayoutVLM
    print("\nStep 6: LayoutVLM 布局优化...")
    scene_config = prepare_task_assets(scene_json.copy(), asset_dir)
    layout = run_layoutvlm(scene_config, output_dir)
    
    result['layout_path'] = layout_path
    result['scene_config_path'] = scene_config_save_path
    result['num_assets'] = len(layout)
    
    # Step 7: Blender 渲染
    if not skip_render:
        print("\nStep 7: Blender 渲染...")
        render_files = render_with_blender(
            scene_config, layout, output_dir, asset_dir,
            views=render_views, engine=render_engine,
            samples=render_samples, width=render_width, height=render_height
        )
        result['render_files'] = render_files
    
    result['success'] = True
    
    # 保存结果
    result_path = os.path.join(output_dir, 'result.json')
    with open(result_path, 'w') as f:
        json.dump(result, f, indent=2)
    
    print("\n" + "=" * 60)
    print("🎉 Pipeline 完成!")
    print("=" * 60)
    print(f"📁 输出目录: {output_dir}")
    print(f"   - scene_config.json")
    print(f"   - layout.json")
    if not skip_render:
        print(f"   - render_*.png")
    
    return result


def main():
    parser = argparse.ArgumentParser(description="单个 Prompt 测试 Pipeline")
    parser.add_argument("--prompt", type=str, default=None, help="用户设计描述")
    parser.add_argument("--output", type=str, default="./results/single_test", help="输出目录")
    parser.add_argument("--asset-dir", type=str, 
                       default="/home/v-meiszhang/backup/objaverse_processed",
                       help="3D assets 目录")
    parser.add_argument("--scene-config", type=str, default=None,
                       help="已有的 scene_config.json 路径")
    parser.add_argument("--skip-render", action="store_true", help="跳过渲染")
    parser.add_argument("--render-only", action="store_true", help="仅渲染")
    # 渲染参数
    parser.add_argument("--render-engine", type=str, default="CYCLES",
                       choices=["CYCLES", "BLENDER_EEVEE"])
    parser.add_argument("--render-samples", type=int, default=256)
    parser.add_argument("--render-width", type=int, default=1600)
    parser.add_argument("--render-height", type=int, default=900)
    parser.add_argument("--render-views", nargs='+', default=['topdown', 'diagonal'],
                       help="渲染视角 (topdown, diagonal, diagonal2, ...)")
    
    args = parser.parse_args()
    
    if not args.prompt and not args.scene_config and not args.render_only:
        parser.error("需要 --prompt 或 --scene-config 或 --render-only")
    
    prompt = args.prompt or ""
    if args.render_only and not prompt:
        # 尝试从 user_input.txt 读取
        user_input_path = os.path.join(args.output, 'user_input.txt')
        if os.path.exists(user_input_path):
            with open(user_input_path, 'r') as f:
                prompt = f.read().strip()
    
    run_pipeline(
        prompt=prompt,
        output_dir=args.output,
        asset_dir=args.asset_dir,
        scene_config_path=args.scene_config,
        skip_render=args.skip_render,
        render_only=args.render_only,
        render_engine=args.render_engine,
        render_samples=args.render_samples,
        render_width=args.render_width,
        render_height=args.render_height,
        render_views=args.render_views,
    )


if __name__ == "__main__":
    main()