offerpai_python_ai/app/services/skill_gap_service.py

"""技能差距分析 + 定制简历 Service

岗位技能差距分析 → 定制简历生成/查询/编辑/回滚 → AI 对话式编辑。
依赖：skill_gap_analyzer（AI引擎）
使用表：bg_job（读）、bg_user_resume + 5张子表（读）
存储：Redis（定制简历 + 回滚数据）
"""

import asyncio
import json

from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.ai.skill_gap_analyzer.analyzer import (
    analyze_skill_gap, optimize_summary, optimize_module,
    plan_edit, execute_record_edit, execute_record_add,
)
from app.ai.skill_gap_analyzer.prompts import MODULE_SCHEMAS
from app.core.logger import log
from app.schemas.customize_resume import (
    CustomizeResume, ResumeProfile, Education, Work, Internship, Project, Competition,
)
from app.models.job import Job
from app.models.user_resume import UserResume
from app.services.resume_loader import ResumeDetail, load_resume_detail, load_default_resume_detail
from app.services import customize_resume_store

# 模块名 → 中文标签映射
_MODULE_LABELS = {
    "resume": "个人简介",
    "education": "教育经历",
    "work": "工作经历",
    "internship": "实习经历",
    "project": "项目经历",
    "competition": "竞赛经历",
}


def _build_resume_json(detail: ResumeDetail) -> str:
    """拼装简历 JSON 字符串供 AI 使用"""
    resume = detail.resume
    data = {
        "skills": resume.skills or [],
        "certificates": resume.certificates or [],
        "summary": resume.summary or "",
        "targetPosition": resume.target_position or "",
    }
    if detail.education:
        data["education"] = [{"school": r.school, "major": r.major, "degree": r.degree, "description": r.description} for r in detail.education]
    if detail.work:
        data["work"] = [{"companyName": r.company_name, "position": r.position, "description": r.description} for r in detail.work]
    if detail.internship:
        data["internship"] = [{"companyName": r.company_name, "position": r.position, "description": r.description} for r in detail.internship]
    if detail.project:
        data["project"] = [{"companyName": r.company_name, "projectName": r.project_name, "role": r.role, "description": r.description} for r in detail.project]
    if detail.competition:
        data["competition"] = [{"competitionName": r.competition_name, "award": r.award, "description": r.description} for r in detail.competition]
    return json.dumps(data, ensure_ascii=False)


class SkillGapService:

    def __init__(self, session: AsyncSession):
        self.session = session

    # ===== 差距分析 =====

    async def analyze_skill_gap(self, user_id: int, job_id: int) -> dict:
        """差距分析完整流程：查简历 → 查岗位 → AI分析 → 计算匹配分"""
        # 1. 自动选择简历
        detail = await load_default_resume_detail(self.session, user_id)
        # 2. 查岗位
        job = await self._get_job(job_id)
        skill_tags: list[str] = job.skill_tags or []
        # 3. skill_tags 为空 → 满分
        if not skill_tags:
            return self._gap_result(10.0, job, detail.resume, [])
        # 4. 拼 AI 输入
        resume_json = _build_resume_json(detail)
        # 5. AI 分析
        missing = await analyze_skill_gap(skill_tags, resume_json)
        # 6. 计算匹配分
        score = round((len(skill_tags) - len(missing)) / len(skill_tags) * 10, 1)
        return self._gap_result(score, job, detail.resume, missing)

    @staticmethod
    def _gap_result(score: float, job: Job, resume: UserResume, missing: list[str]) -> dict:
        return {
            "score": score,
            "job": {"jobId": str(job.id), "title": job.title, "skillTags": job.skill_tags or []},
            "resume": {"resumeId": str(resume.id), "resumeName": resume.resume_name or "", "targetPosition": resume.target_position or ""},
            "missingSkills": missing,
        }

    # ===== 生成定制简历 =====

    async def generate_customize_resume(self, user_id: int, job_id: int, resume_id: int,
                                        optimize_modules: list[str], add_skills: list[str]) -> None:
        """生成定制简历：查数据 → 并发AI优化 → 存Redis"""
        if not optimize_modules:
            raise ValueError("请至少选择一个优化模块")
        # 1. 查简历 + 岗位
        detail = await load_resume_detail(self.session, resume_id, user_id)
        job = await self._get_job(job_id)
        # 2. 组装基础定制简历
        cr = customize_resume_store.build_from_detail(detail)
        # 3. 并发 AI 优化
        tasks = []
        job_desc = f"{job.description or ''}\n{job.requirement or ''}"
        if "summary" in optimize_modules:
            tasks.append(("summary", optimize_summary(job.title or "", add_skills, detail.resume.summary or "")))
        if "experience" in optimize_modules:
            for module_name, rows_json in self._experience_tasks(cr, job.title or "", job_desc):
                tasks.append((module_name, optimize_module(job.title or "", job_desc, rows_json)))
        # 执行并发
        if tasks:
            keys = [t[0] for t in tasks]
            results = await asyncio.gather(*[t[1] for t in tasks], return_exceptions=True)
            for key, result in zip(keys, results):
                if isinstance(result, Exception):
                    log.warning(f"定制简历优化[{key}]失败: {result}")
                    continue
                self._apply_optimize_result(cr, key, result)
        # 4. skills 追加（纯内存操作）
        if "skills" in optimize_modules and add_skills:
            existing = set(cr.resume.skills)
            cr.resume.skills.extend([s for s in add_skills if s not in existing])
        # 5. 存数据库
        await customize_resume_store.save(user_id, job_id, cr)

    @staticmethod
    def _experience_tasks(cr: CustomizeResume, job_title: str, job_desc: str) -> list[tuple[str, str]]:
        """构建各子表的 AI 优化任务列表"""
        result = []
        for name, items in [("education", cr.education), ("work", cr.work), ("internship", cr.internship),
                            ("project", cr.project), ("competition", cr.competition)]:
            if items:
                result.append((name, json.dumps([item.model_dump(by_alias=True) for item in items], ensure_ascii=False)))
        return result

    @staticmethod
    def _apply_optimize_result(cr: CustomizeResume, key: str, result) -> None:
        """将 AI 优化结果应用到定制简历"""
        if key == "summary" and isinstance(result, str):
            cr.resume.summary = result
        elif key == "education" and isinstance(result, list):
            cr.education = [Education.model_validate(item) for item in result]
        elif key == "work" and isinstance(result, list):
            cr.work = [Work.model_validate(item) for item in result]
        elif key == "internship" and isinstance(result, list):
            cr.internship = [Internship.model_validate(item) for item in result]
        elif key == "project" and isinstance(result, list):
            cr.project = [Project.model_validate(item) for item in result]
        elif key == "competition" and isinstance(result, list):
            cr.competition = [Competition.model_validate(item) for item in result]

    # ===== AI 对话编辑 =====

    async def ai_edit_customize_resume(self, user_id: int, job_id: int,
                                       instruction: str, chat_history: list) -> dict:
        """AI 对话式编辑定制简历（原子化操作版）"""
        # 1. 取当前定制简历
        cr_data = await customize_resume_store.get(user_id, job_id)
        if not cr_data:
            raise ValueError("定制简历不存在，请先生成")
        cr = CustomizeResume.model_validate(cr_data)
        resume_json = cr.model_dump_json(by_alias=True)
        # 2. 查岗位
        job = await self._get_job(job_id)
        job_desc = f"{job.description or ''}\n{job.requirement or ''}"
        # 3. 规划 AI（意图识别 + 操作原子化）
        history_str = json.dumps(chat_history, ensure_ascii=False) if chat_history else "无"
        plan = await plan_edit(job.title or "", job_desc, resume_json, history_str, instruction)
        if not plan:
            return {"type": "message", "message": "抱歉，我没有理解你的意思，请再描述一下。"}
        if plan.get("action") == "chat":
            return {"type": "message", "message": plan.get("message", "请再描述一下你的需求。")}
        # 4. 解析操作列表
        operations = plan.get("operations", [])
        if not operations:
            return {"type": "message", "message": plan.get("message", "请再描述一下你的需求。")}
        # 截取最近10条对话历史
        recent_history = chat_history[-10:] if len(chat_history) > 10 else chat_history
        recent_history_str = json.dumps(recent_history, ensure_ascii=False) if recent_history else "无"
        # 5. 按操作类型分发执行
        # 先处理 delete（零 AI 开销）
        for op in operations:
            if op.get("type") == "delete":
                self._apply_delete(cr, op.get("module", ""), op.get("id", ""))
        # 并发执行 update 和 add
        ai_tasks = []
        for op in operations:
            op_type = op.get("type", "")
            mod_name = op.get("module", "")
            op_instruction = op.get("instruction", "")
            schema = MODULE_SCHEMAS.get(mod_name, "")
            if op_type == "update":
                record_data = self._get_record_data(cr, mod_name, op.get("id"))
                if record_data is not None:
                    ai_tasks.append((
                        "update", mod_name, op.get("id"),
                        execute_record_edit(
                            job.title or "", job_desc, op_instruction,
                            recent_history_str, schema, record_data,
                        ),
                    ))
            elif op_type == "add":
                ai_tasks.append((
                    "add", mod_name, None,
                    execute_record_add(
                        job.title or "", job_desc, op_instruction,
                        recent_history_str, schema,
                    ),
                ))
        # 并发执行
        if ai_tasks:
            coros = [t[3] for t in ai_tasks]
            results = await asyncio.gather(*coros, return_exceptions=True)
            for (op_type, mod_name, record_id, _), result in zip(ai_tasks, results):
                if isinstance(result, Exception):
                    log.warning(f"AI编辑[{op_type}/{mod_name}/{record_id}]失败: {result}")
                    continue
                if result is None:
                    continue
                if op_type == "update":
                    self._apply_record_update(cr, mod_name, record_id, result)
                elif op_type == "add":
                    self._apply_record_add(cr, mod_name, result)
        # 6. 保存（自动备份回滚）
        await customize_resume_store.save(user_id, job_id, cr)
        # 拼接更新模块标签
        updated_modules = list(dict.fromkeys(op.get("module", "") for op in operations))
        label = "、".join(_MODULE_LABELS.get(m, m) for m in updated_modules if m)
        return {"type": "updated", "message": f"完成！已更新：{label or '简历内容'}"}

    @staticmethod
    def _get_record_data(cr: CustomizeResume, mod_name: str, record_id: str | None) -> str | None:
        """获取单条记录的 JSON 数据，resume 主表返回整个对象"""
        if mod_name == "resume":
            return cr.resume.model_dump_json(by_alias=True)
        mapping = {
            "education": cr.education, "work": cr.work, "internship": cr.internship,
            "project": cr.project, "competition": cr.competition,
        }
        items = mapping.get(mod_name, [])
        if not record_id:
            return None
        for item in items:
            if item.id == record_id:
                return item.model_dump_json(by_alias=True)
        log.warning(f"未找到记录[{mod_name}/{record_id}]")
        return None

    @staticmethod
    def _apply_delete(cr: CustomizeResume, mod_name: str, record_id: str) -> None:
        """删除指定模块中的一条记录"""
        if not record_id or mod_name == "resume":
            return
        mapping = {
            "education": cr.education, "work": cr.work, "internship": cr.internship,
            "project": cr.project, "competition": cr.competition,
        }
        items = mapping.get(mod_name)
        if items is not None:
            for i, item in enumerate(items):
                if item.id == record_id:
                    items.pop(i)
                    break

    @staticmethod
    def _apply_record_update(cr: CustomizeResume, mod_name: str, record_id: str | None, result) -> None:
        """将 AI 修改结果替换回对应记录"""
        try:
            if mod_name == "resume" and isinstance(result, dict):
                cr.resume = ResumeProfile.model_validate(result)
                return
            model_map = {
                "education": Education, "work": Work, "internship": Internship,
                "project": Project, "competition": Competition,
            }
            model_cls = model_map.get(mod_name)
            if not model_cls or not isinstance(result, dict) or not record_id:
                return
            list_map = {
                "education": cr.education, "work": cr.work, "internship": cr.internship,
                "project": cr.project, "competition": cr.competition,
            }
            items = list_map.get(mod_name, [])
            new_item = model_cls.model_validate(result)
            for i, item in enumerate(items):
                if item.id == record_id:
                    items[i] = new_item
                    break
        except Exception as e:
            log.warning(f"应用AI编辑结果[{mod_name}/{record_id}]失败: {e}")

    @staticmethod
    def _apply_record_add(cr: CustomizeResume, mod_name: str, result) -> None:
        """将 AI 新增的记录追加到对应模块"""
        try:
            model_map = {
                "education": (Education, cr.education),
                "work": (Work, cr.work),
                "internship": (Internship, cr.internship),
                "project": (Project, cr.project),
                "competition": (Competition, cr.competition),
            }
            entry = model_map.get(mod_name)
            if not entry or not isinstance(result, dict):
                return
            model_cls, items = entry
            items.append(model_cls.model_validate(result))
        except Exception as e:
            log.warning(f"应用AI新增记录[{mod_name}]失败: {e}")

    # ===== 内部工具方法 =====

    async def _get_job(self, job_id: int) -> Job:
        """查岗位"""
        result = await self.session.execute(select(Job).where(Job.id == job_id))
        job = result.scalar_one_or_none()
        if not job:
            raise ValueError("岗位不存在")
        return job