"""管理后台服务：用户、角色、LLM、Prompt 管理。"""
import bcrypt
import requests
import uuid
from flask import current_app
from insurance.db.compat import db
from insurance.models.wecom_group import WeComGroupConfig
from insurance.models.wecom_user import WeComUserMapping
from sqlalchemy import or_


class AdminService:
    """管理后台业务逻辑。"""

    # ---- 用户管理 ----

    def list_users(self, params: dict) -> dict:
        query = db.session.query(WeComUserMapping)
        if params.get("role"):
            query = query.filter(WeComUserMapping.role == params["role"])
        if params.get("department"):
            query = query.filter(WeComUserMapping.department == params["department"])

        total = query.count()
        items = query.offset((params["page"] - 1) * params["page_size"]).limit(params["page_size"]).all()

        # 检查每个用户是否已同步到 Dify
        dify_users = set()
        try: 
            result = db.session.execute(db.text("SELECT name FROM accounts"))
            dify_users = {row[0] for row in result.fetchall()}
        except Exception:
            pass

        return {
            "code": 0,
            "data": {
                "total": total,
                "items": [
                    {
                        "id": str(u.id),
                        "username": u.username,
                        "email": u.email,
                        "real_name": u.real_name,
                        "email_verified": u.email_verified,
                        "wecom_userid": u.wecom_userid,
                        "role": u.role,
                        "department": u.department,
                        "status": u.status,
                        "synced_to_dify": u.username in dify_users,
                        "created_at": str(u.created_at) if u.created_at else None,
                        "last_active_at": str(u.last_active_at) if u.last_active_at else None,
                    }
                    for u in items
                ],
            },
        }

    def create_user(self, data: dict) -> dict:
        username = (data.get("username") or "").strip()
        email = (data.get("email") or "").strip().lower()
        if username and db.session.query(WeComUserMapping).filter_by(username=username).first():
            return {"code": 1001, "message": "用户名已存在", "data": None}
        if email and db.session.query(WeComUserMapping).filter_by(email=email).first():
            return {"code": 1001, "message": "邮箱已被使用", "data": None}

        wecom_userid = (data.get("wecom_userid") or "").strip() or f"local_{uuid.uuid4().hex[:8]}"
        internal_user_id = (data.get("internal_user_id") or "").strip() or f"manual_{wecom_userid}"
        user = WeComUserMapping(
            wecom_userid=wecom_userid,
            internal_user_id=internal_user_id,
            username=username,
            email=email,
            real_name=(data.get("real_name") or "").strip(),
            email_verified="true" if data.get("email") else "false",
            role=data.get("role", "sales"),
            department=data.get("department", ""),
        )
        if data.get("password"):
            user.password_hash = bcrypt.hashpw(data["password"].encode(), bcrypt.gensalt()).decode()
        db.session.add(user)
        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            raise

        # 同步到 Dify accounts 表
        if data.get("password"):
            self._sync_user_to_dify(user.username, data["password"], user.email)

        from insurance.utils.audit import log_operation
        log_operation("system", "create", "user", str(user.id), {"username": user.username})

        return {"code": 0, "message": "success", "data": {"id": str(user.id)}}

    def _sync_user_to_dify(self, username: str, password: str, email: str = "") -> bool:
        """同步用户到 Dify accounts 表。"""
        try:
            import uuid as uuid_mod
            from datetime import datetime, timezone

            # 检查是否已存在
            result = db.session.execute(
                db.text("SELECT id FROM accounts WHERE name = :name"),
                {"name": username}
            )
            if result.fetchone():
                return True

            # 创建 Dify 账号
            account_id = str(uuid_mod.uuid4())
            account_email = email or f"{username}@baodan.local"
            now = datetime.now(timezone.utc)

            # Dify 期望密码已经是 bcrypt 哈希后的值
            password_hash = bcrypt.hashpw(password.encode(), bcrypt.gensalt()).decode()
            db.session.execute(
                db.text("""
                    INSERT INTO accounts (id, name, email, password, avatar, interface_language,
                                         interface_theme, timezone, last_login_at, last_active_at,
                                         status, created_at, updated_at)
                    VALUES (:id, :name, :email, :password, '', 'zh-Hans', 'light', 'Asia/Shanghai',
                            :now, :now, 'active', :now, :now)
                """),
                {"id": account_id, "name": username, "email": account_email, "password": password_hash, "now": now}
            )

            # 关联到默认租户
            tenant_result = db.session.execute(db.text("SELECT id FROM tenants LIMIT 1"))
            tenant = tenant_result.fetchone()

            if tenant:
                db.session.execute(
                    db.text("""
                        INSERT INTO tenant_account_joins (id, tenant_id, account_id, role,
                                                          invited_by, created_at, updated_at)
                        VALUES (:id, :tenant_id, :account_id, 'normal', NULL, :now, :now)
                    """),
                    {"id": str(uuid_mod.uuid4()), "tenant_id": str(tenant[0]), "account_id": account_id, "now": now}
                )

            db.session.commit()
            return True
        except Exception as e:
            print(f"同步用户到 Dify 失败: {e}")
            db.session.rollback()
            return False

    def update_user(self, user_id: str, data: dict) -> dict:
        user = db.session.query(WeComUserMapping).filter_by(id=int(user_id)).first()
        if not user:
            return {"code": 1005, "message": "用户不存在", "data": None}
        if "username" in data and data["username"] != user.username:
            existing = db.session.query(WeComUserMapping).filter_by(username=data["username"]).first()
            if existing:
                return {"code": 1001, "message": "用户名已存在", "data": None}
        if "email" in data:
            new_email = (data["email"] or "").strip().lower()
            if new_email and new_email != user.email:
                existing = db.session.query(WeComUserMapping).filter_by(email=new_email).first()
                if existing:
                    return {"code": 1001, "message": "邮箱已被使用", "data": None}
        for key in ("username", "email", "real_name", "role", "department", "status"):
            if key in data:
                value = data[key]
                if key == "email":
                    value = (value or "").strip().lower()
                    user.email_verified = "true" if value else "false"
                elif key == "real_name":
                    value = (value or "").strip()
                setattr(user, key, value)
        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            raise

        # 同步状态到 Dify
        if "status" in data:
            self._sync_user_status_to_dify(user.username, data["status"])

        return {"code": 0, "message": "success", "data": None}

    # ---- 企微群配置 ----

    def list_wecom_groups(self, params: dict) -> dict:
        query = db.session.query(WeComGroupConfig)
        if params.get("status"):
            query = query.filter(WeComGroupConfig.status == params["status"])
        if params.get("keyword"):
            keyword = f"%{params['keyword']}%"
            query = query.filter(
                or_(
                    WeComGroupConfig.chatid.ilike(keyword),
                    WeComGroupConfig.name.ilike(keyword),
                )
            )

        total = query.count()
        items = (
            query.order_by(WeComGroupConfig.updated_at.desc())
            .offset((params["page"] - 1) * params["page_size"])
            .limit(params["page_size"])
            .all()
        )
        return {"code": 0, "data": {"total": total, "items": [g.to_dict() for g in items]}}

    def update_wecom_group(self, group_id: str, data: dict) -> dict:
        group = db.session.query(WeComGroupConfig).filter_by(id=int(group_id)).first()
        if not group:
            return {"code": 1005, "message": "企微群配置不存在", "data": None}

        if "name" in data:
            group.name = (data.get("name") or "").strip()
        if "webhook_url" in data:
            group.webhook_url = (data.get("webhook_url") or "").strip()
        if "status" in data:
            status = data.get("status") or "active"
            if status not in ("active", "disabled"):
                return {"code": 1001, "message": "群配置状态无效", "data": None}
            group.status = status

        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            raise

        return {"code": 0, "message": "success", "data": group.to_dict()}

    def delete_user(self, user_id: str) -> dict:
        user = db.session.query(WeComUserMapping).filter_by(id=int(user_id)).first()
        if not user:
            return {"code": 1005, "message": "用户不存在", "data": None}
        user.status = "disabled"
        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            raise

        # 同步停用状态到 Dify
        self._sync_user_status_to_dify(user.username, "disabled")

        from insurance.utils.audit import log_operation
        log_operation("system", "disable", "user", user_id, {"username": user.username})

        return {"code": 0, "message": "success", "data": None}

    def _sync_user_status_to_dify(self, username: str, status: str) -> bool:
        """同步用户状态到 Dify。"""
        try:
            dify_status = "active" if status == "active" else "banned"
            db.session.execute(
                db.text("UPDATE accounts SET status = :status, updated_at = NOW() WHERE name = :name"),
                {"status": dify_status, "name": username}
            )
            db.session.commit()
            return True
        except Exception as e:
            print(f"同步用户状态到 Dify 失败: {e}")
            db.session.rollback()
            return False

    def batch_import_users(self, file) -> dict:
        """批量导入用户（从Excel文件）。"""
        import openpyxl
        import uuid

        try:
            # 读取Excel文件
            wb = openpyxl.load_workbook(file)
            ws = wb.active

            # 获取表头
            headers = [cell.value for cell in ws[1]]
            username_idx = headers.index("用户名") if "用户名" in headers else 0
            password_idx = headers.index("密码") if "密码" in headers else 1
            role_idx = headers.index("角色") if "角色" in headers else 2
            department_idx = headers.index("部门") if "部门" in headers else 3

            created = 0
            skipped = 0
            errors = []

            for row_idx, row in enumerate(ws.iter_rows(min_row=2, values_only=True), start=2):
                username = row[username_idx] if username_idx < len(row) else ""
                password = row[password_idx] if password_idx < len(row) else ""
                role = row[role_idx] if role_idx < len(row) else "sales"
                department = row[department_idx] if department_idx < len(row) else ""

                if not username or not password:
                    errors.append(f"第{row_idx}行：用户名或密码为空")
                    continue

                # 检查用户名是否已存在
                existing = db.session.query(WeComUserMapping).filter_by(username=str(username)).first()
                if existing:
                    skipped += 1
                    continue

                # 创建用户
                password_hash = bcrypt.hashpw(str(password).encode(), bcrypt.gensalt()).decode()
                mapping = WeComUserMapping(
                    wecom_userid=f"local_{uuid.uuid4().hex[:8]}",
                    internal_user_id=f"user_{uuid.uuid4().hex[:8]}",
                    username=str(username),
                    password_hash=password_hash,
                    role=str(role) if role else "sales",
                    department=str(department) if department else "",
                    status="active",
                )
                db.session.add(mapping)
                created += 1

            try:
                db.session.commit()
            except Exception:
                db.session.rollback()
                raise

            from insurance.utils.audit import log_operation
            log_operation("system", "batch_import", "user", "", {
                "created": created,
                "skipped": skipped,
                "errors": errors[:10],  # 最多记录10个错误
            })

            return {
                "code": 0,
                "message": f"导入完成：成功 {created} 个，跳过 {skipped} 个",
                "data": {
                    "created": created,
                    "skipped": skipped,
                    "errors": errors,
                },
            }

        except Exception as e:
            db.session.rollback()
            return {"code": 5001, "message": f"导入失败: {str(e)}", "data": None}

    def sync_all_users_to_dify(self) -> dict:
        """同步所有本地用户到 Dify。"""
        try:
            # 获取所有本地用户
            users = db.session.query(WeComUserMapping).filter(
                WeComUserMapping.wecom_userid.like('local_%')
            ).all()

            # 获取已同步的用户
            result = db.session.execute(db.text("SELECT name FROM accounts"))
            existing_users = {row[0] for row in result.fetchall()}

            synced = 0
            skipped = 0
            errors = 0

            for user in users:
                if user.username in existing_users:
                    skipped += 1
                    continue

                # 生成默认密码
                default_password = f"Baodan@{user.id}2024"
                if self._sync_user_to_dify(user.username, default_password, user.email):
                    synced += 1
                else:
                    errors += 1

            return {
                "code": 0,
                "message": f"同步完成: 成功 {synced}, 跳过 {skipped}, 失败 {errors}",
                "data": {"synced": synced, "skipped": skipped, "errors": errors}
            }
        except Exception as e:
            return {"code": 500, "message": f"同步失败: {str(e)}", "data": None}

    # ---- 角色管理 ----

    _builtin_roles_initialized = False

    def _init_builtin_roles(self):
        """初始化内置角色（如果不存在）。只在首次调用时执行。"""
        if AdminService._builtin_roles_initialized:
            return

        import json
        from insurance.models.role import Role

        builtin_roles = [
            {"name": "super_admin", "permissions": ["*"], "description": "超级管理员"},
            {"name": "admin", "permissions": ["*"], "description": "管理员"},
            {"name": "manager", "permissions": ["chat", "proposal", "kb_view", "team_stats"], "description": "销售主管"},
            {"name": "sales", "permissions": ["chat", "proposal"], "description": "销售人员"},
            {"name": "client", "permissions": ["chat"], "description": "客户"},
        ]

        for role_data in builtin_roles:
            existing = db.session.query(Role).filter_by(name=role_data["name"]).first()
            if existing:
                # 同步内置角色的权限（确保代码中的定义与数据库一致）
                new_perms = json.dumps(role_data["permissions"])
                if existing.permissions != new_perms:
                    existing.permissions = new_perms
            else:
                role = Role(
                    name=role_data["name"],
                    description=role_data["description"],
                    permissions=json.dumps(role_data["permissions"]),
                    builtin=True,
                )
                db.session.add(role)
        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            raise
        AdminService._builtin_roles_initialized = True

    def list_roles(self) -> dict:
        import json
        from insurance.models.role import Role

        # 确保内置角色存在（首次调用时初始化）
        self._init_builtin_roles()

        roles = db.session.query(Role).all()
        return {"code": 0, "data": [r.to_dict() for r in roles]}

    def create_role(self, data: dict) -> dict:
        import json
        from insurance.models.role import Role

        # 检查角色名是否已存在
        existing = db.session.query(Role).filter_by(name=data.get("name")).first()
        if existing:
            return {"code": 1006, "message": "角色名已存在", "data": None}

        role = Role(
            name=data.get("name", ""),
            description=data.get("description", ""),
            permissions=json.dumps(data.get("permissions", [])),
            builtin=False,
        )
        db.session.add(role)
        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            raise

        from insurance.utils.audit import log_operation
        log_operation("system", "create", "role", str(role.id), {"name": role.name})

        return {"code": 0, "message": "success", "data": {"id": f"role-{role.id}"}}

    def update_role(self, role_id: str, data: dict) -> dict:
        import json
        from insurance.models.role import Role

        role_id_int = int(role_id.replace("role-", ""))
        role = db.session.query(Role).filter_by(id=role_id_int).first()
        if not role:
            return {"code": 1005, "message": "角色不存在", "data": None}

        if role.builtin and "name" in data:
            return {"code": 1007, "message": "内置角色不可修改名称", "data": None}

        if "description" in data:
            role.description = data["description"]
        if "permissions" in data:
            role.permissions = json.dumps(data["permissions"])

        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            raise

        from insurance.utils.audit import log_operation
        log_operation("system", "update", "role", role_id, {"name": role.name})

        return {"code": 0, "message": "success", "data": None}

    def delete_role(self, role_id: str) -> dict:
        from insurance.models.role import Role

        role_id_int = int(role_id.replace("role-", ""))
        role = db.session.query(Role).filter_by(id=role_id_int).first()
        if not role:
            return {"code": 1005, "message": "角色不存在", "data": None}

        if role.builtin:
            return {"code": 1008, "message": "内置角色不可删除", "data": None}

        db.session.delete(role)
        try:
            db.session.commit()
        except Exception:
            db.session.rollback()
            raise

        from insurance.utils.audit import log_operation
        log_operation("system", "delete", "role", role_id, {"name": role.name})

        return {"code": 0, "message": "success", "data": None}

    # ---- LLM 配置 ----

    def list_llm_configs(self) -> dict:
        # 调用 BaoDan API 获取模型列表
        base_url = current_app.config.get("BAODAN_API_URL", "http://localhost:5001")
        try:
            resp = requests.get(f"{base_url}/v1/models", timeout=10)
            return {"code": 0, "data": resp.json()}
        except Exception:
            return {"code": 0, "data": []}

    def create_llm_config(self, data: dict) -> dict:
        # TODO: 存储到数据库并同步到 BaoDan
        return {"code": 0, "message": "success", "data": {"id": "llm-new"}}

    def update_llm_config(self, config_id: str, data: dict) -> dict:
        return {"code": 0, "message": "success", "data": None}

    def ping_llm(self, config_id: str) -> dict:
        # TODO: 调用 BaoDan 模型测试接口
        return {"code": 0, "data": {"reachable": True, "latency_ms": 0, "model": ""}}

    # ---- Prompt 管理 ----

    def list_prompts(self) -> dict:
        import json
        from insurance.models.prompt import PromptTemplate

        prompts = db.session.query(PromptTemplate).all()
        return {"code": 0, "data": [p.to_dict() for p in prompts]}

    def get_prompt(self, prompt_id: str) -> dict:
        from insurance.models.prompt import PromptTemplate

        prompt_id_int = int(prompt_id.replace("prompt-", ""))
        prompt = db.session.query(PromptTemplate).filter_by(id=prompt_id_int).first()
        if not prompt:
            return {"code": 1005, "message": "模板不存在", "data": None}
        return {"code": 0, "data": prompt.to_dict()}

    def save_prompt(self, data: dict) -> dict:
        import json
        from insurance.models.prompt import PromptTemplate, PromptVersion

        prompt_id = data.get("id")

        if prompt_id:
            # 更新现有模板
            prompt_id_int = int(prompt_id.replace("prompt-", ""))
            prompt = db.session.query(PromptTemplate).filter_by(id=prompt_id_int).first()
            if not prompt:
                return {"code": 1005, "message": "模板不存在", "data": None}

            # 记录变更前的值
            old_value = {
                "name": prompt.name,
                "description": prompt.description,
                "content": prompt.content,
                "variables": json.loads(prompt.variables) if prompt.variables else [],
                "category": prompt.category,
            }

            # 保存旧版本
            latest_version = db.session.query(PromptVersion).filter_by(
                prompt_id=prompt_id_int
            ).order_by(PromptVersion.version.desc()).first()

            new_version = (latest_version.version + 1) if latest_version else 1

            version_record = PromptVersion(
                prompt_id=prompt_id_int,
                version=new_version,
                content=prompt.content,
                variables=prompt.variables,
                change_note=data.get("change_note", ""),
            )
            db.session.add(version_record)

            # 更新模板
            prompt.name = data.get("name", prompt.name)
            prompt.description = data.get("description", prompt.description)
            prompt.content = data.get("content", prompt.content)
            prompt.variables = json.dumps(data.get("variables", []))
            prompt.category = data.get("category", prompt.category)

            try:
                db.session.commit()
            except Exception:
                db.session.rollback()
                raise

            # 记录配置变更日志（含变更前后值）
            new_value = {
                "name": prompt.name,
                "description": prompt.description,
                "content": prompt.content,
                "variables": json.loads(prompt.variables) if prompt.variables else [],
                "category": prompt.category,
            }
            from insurance.utils.audit import log_config_change
            log_config_change("system", "prompt", prompt_id, old_value, new_value)

            return {"code": 0, "data": {"id": f"prompt-{prompt.id}", "version": new_version}}
        else:
            # 创建新模板
            prompt = PromptTemplate(
                name=data.get("name", ""),
                description=data.get("description", ""),
                content=data.get("content", ""),
                variables=json.dumps(data.get("variables", [])),
                category=data.get("category", "general"),
            )
            db.session.add(prompt)
            db.session.flush()

            # 创建初始版本
            version_record = PromptVersion(
                prompt_id=prompt.id,
                version=1,
                content=prompt.content,
                variables=prompt.variables,
                change_note="初始版本",
            )
            db.session.add(version_record)
            try:
                db.session.commit()
            except Exception:
                db.session.rollback()
                raise

            from insurance.utils.audit import log_operation
            log_operation("system", "create", "prompt", str(prompt.id), {"name": prompt.name})

            return {"code": 0, "data": {"id": f"prompt-{prompt.id}", "version": 1}}

    def delete_prompt(self, prompt_id: str) -> dict:
        from insurance.models.prompt import PromptTemplate, PromptVersion

        prompt_id_int = int(prompt_id.replace("prompt-", ""))
        prompt = db.session.query(PromptTemplate).filter_by(id=prompt_id_int).first()
        if not prompt:
            return {"code": 1005, "message": "模板不存在", "data": None}

        # 删除版本历史
        db.session.query(PromptVersion).filter_by(prompt_id=prompt_id_int).delete()
        # 删除模板
        db.session.delete(prompt)
        db.session.commit()

        from insurance.utils.audit import log_operation
        log_operation("system", "delete", "prompt", prompt_id, {"name": prompt.name})

        return {"code": 0, "message": "success", "data": None}

    def get_prompt_versions(self, prompt_id: str) -> dict:
        from insurance.models.prompt import PromptVersion

        prompt_id_int = int(prompt_id.replace("prompt-", ""))
        versions = db.session.query(PromptVersion).filter_by(
            prompt_id=prompt_id_int
        ).order_by(PromptVersion.version.desc()).all()

        return {"code": 0, "data": [v.to_dict() for v in versions]}

    def rollback_prompt(self, prompt_id: str, version: int) -> dict:
        import json
        from insurance.models.prompt import PromptTemplate, PromptVersion

        prompt_id_int = int(prompt_id.replace("prompt-", ""))
        prompt = db.session.query(PromptTemplate).filter_by(id=prompt_id_int).first()
        if not prompt:
            return {"code": 1005, "message": "模板不存在", "data": None}

        version_record = db.session.query(PromptVersion).filter_by(
            prompt_id=prompt_id_int, version=version
        ).first()
        if not version_record:
            return {"code": 1005, "message": "版本不存在", "data": None}

        # 保存当前版本为新版本
        latest_version = db.session.query(PromptVersion).filter_by(
            prompt_id=prompt_id_int
        ).order_by(PromptVersion.version.desc()).first()

        new_version = (latest_version.version + 1) if latest_version else 1

        rollback_record = PromptVersion(
            prompt_id=prompt_id_int,
            version=new_version,
            content=prompt.content,
            variables=prompt.variables,
            change_note=f"回滚到版本 {version}",
        )
        db.session.add(rollback_record)

        # 回滚内容
        prompt.content = version_record.content
        prompt.variables = version_record.variables
        db.session.commit()

        from insurance.utils.audit import log_operation
        log_operation("system", "rollback", "prompt", prompt_id, {"version": version})

        return {"code": 0, "data": {"id": f"prompt-{prompt.id}", "version": new_version}}

    def test_prompt(self, data: dict) -> dict:
        api_key = current_app.config.get("BAODAN_CHAT_API_KEY", "")
        base_url = current_app.config.get("BAODAN_API_URL", "http://localhost:5001")

        # 构建输入
        inputs = data.get("variables", {})
        test_query = data.get("test_query", "")

        # 如果有模板内容，替换变量
        template_content = data.get("content", "")
        if template_content and inputs:
            for key, value in inputs.items():
                template_content = template_content.replace(f"{{{{{key}}}}}", str(value))

        resp = requests.post(
            f"{base_url}/v1/chat-messages",
            json={
                "inputs": inputs,
                "query": test_query,
                "response_mode": "blocking",
                "user": "admin",
            },
            headers={"Authorization": f"Bearer {api_key}", "Content-Type": "application/json"},
            timeout=30,
        )
        result = resp.json()
        return {
            "code": 0,
            "data": {
                "response": result.get("answer", ""),
                "latency_ms": 0,
                "token_usage": result.get("metadata", {}).get("usage", {}),
            },
        }