"""
app/api/v1/task_actions.py — 任务操作端点
选文案 / 选图 / 导入文案 / 重新生成 / 提交审核 / 偏好上下文
DTOs 和辅助函数从 tasks.py 导入。
"""

import logging
from typing import Annotated

from fastapi import APIRouter, Depends
from pydantic import BaseModel, Field
from sqlalchemy.orm import Session

from app.core.database import get_db
from app.core.response import ok, raise_not_found, raise_state_invalid
from app.middleware.workspace_guard import CurrentUser, require_write_permission
from app.models.task import GenerationTask, ImageCandidate, TextCandidate

from app.api.v1.tasks import (
    SelectCandidateRequest,
    ImportTextRequest,
    _fmt_text,
    _fmt_image,
    _check_task_ownership,
)

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/tasks", tags=["tasks"])


@router.post("/{task_id}/text-candidates/select")
def select_text(
    task_id: int, body: SelectCandidateRequest,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    """选文案（飞轮信号 text_select +3）。"""
    from app.services.flywheel_service import record_signal
    task = _check_task_ownership(
        db.query(GenerationTask).filter(GenerationTask.id == task_id).first(),
        current_user.workspace_id,
    )
    tc = db.query(TextCandidate).filter(
        TextCandidate.id == body.candidate_id, TextCandidate.task_id == task_id
    ).first()
    if not tc:
        raise_not_found("文案候选不存在")
    tc.is_selected = True
    db.commit()
    record_signal(db, current_user, task, "text_select", candidate_id=tc.id, angle_label=tc.angle_label)
    return ok({"selected": body.candidate_id})


@router.post("/{task_id}/image-candidates/select")
def select_image(
    task_id: int, body: SelectCandidateRequest,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    """选图（飞轮信号 image_select +3）。"""
    from app.services.flywheel_service import record_signal
    task = _check_task_ownership(
        db.query(GenerationTask).filter(GenerationTask.id == task_id).first(),
        current_user.workspace_id,
    )
    ic = db.query(ImageCandidate).filter(
        ImageCandidate.id == body.candidate_id, ImageCandidate.task_id == task_id
    ).first()
    if not ic:
        raise_not_found("图片候选不存在")
    ic.is_selected = True
    db.commit()
    record_signal(db, current_user, task, "image_select", candidate_id=ic.id)
    return ok({"selected": body.candidate_id})


@router.post("/{task_id}/import-text")
def import_text(
    task_id: int, body: ImportTextRequest,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    """轨B：导入外部文案直接进候选池，跳过 AI 生成（洞2）。"""
    _check_task_ownership(
        db.query(GenerationTask).filter(GenerationTask.id == task_id).first(),
        current_user.workspace_id,
    )
    tc = TextCandidate(
        workspace_id=current_user.workspace_id, task_id=task_id,
        source="import", content=body.content, angle_label=body.angle_label,
    )
    db.add(tc)
    db.commit()
    db.refresh(tc)
    return ok(_fmt_text(tc))


@router.post("/{task_id}/regenerate")
def regenerate(
    task_id: int,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    """重新生成（飞轮信号 regenerate -1）。"""
    from app.services.flywheel_service import record_signal
    from app.services.task_service import enqueue_generation
    task = _check_task_ownership(
        db.query(GenerationTask).filter(GenerationTask.id == task_id).first(),
        current_user.workspace_id,
    )
    record_signal(db, current_user, task, "regenerate")
    enqueue_generation(task.id)
    return ok({"task_id": task_id, "status": "regenerating"})


@router.post("/{task_id}/submit-review")
def submit_review(
    task_id: int,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    """提交审核（状态 pending_selection → pending_review）。"""
    task = _check_task_ownership(
        db.query(GenerationTask).filter(GenerationTask.id == task_id).first(),
        current_user.workspace_id,
    )
    if task.status != "pending_selection":
        raise_state_invalid("只有 pending_selection 状态可提审")
    task.status = "pending_review"
    db.commit()
    return ok({"task_id": task_id, "status": "pending_review"})


@router.get("/{task_id}/preference/context")
def get_preference_context(
    task_id: int,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    """取本任务飞轮偏好上下文（最近选中样本+打回原因）。"""
    task = _check_task_ownership(
        db.query(GenerationTask).filter(GenerationTask.id == task_id).first(),
        current_user.workspace_id,
    )
    from app.services.flywheel_service import get_preference_context
    ctx = get_preference_context(db, current_user.workspace_id, task.product_id)
    return ok(ctx)


class EditTextRequest(BaseModel):
    """改稿请求：candidate_id + 用户改后的新文案。"""
    candidate_id: int
    content: str = Field(min_length=1, max_length=5000)


@router.post("/{task_id}/text-candidates/{candidate_id}/edit")
def edit_text(
    task_id: int, candidate_id: int, body: EditTextRequest,
    current_user: Annotated[CurrentUser, Depends(require_write_permission)] = None,
    db: Session = Depends(get_db),
):
    """改稿（飞轮信号 text_edit +5，最强真实信号）。

    用户真改了文案的字=最在乎这条方向。回写 content + edited=True，
    并写 text_edit 飞轮偏好事件。倩倩姐2026-06-16拍板，先激进入飞轮跑一周再校准。
    """
    from app.services.flywheel_service import record_signal
    task = _check_task_ownership(
        db.query(GenerationTask).filter(GenerationTask.id == task_id).first(),
        current_user.workspace_id,
    )
    tc = db.query(TextCandidate).filter(
        TextCandidate.id == candidate_id, TextCandidate.task_id == task_id
    ).first()
    if not tc:
        raise_not_found("文案候选不存在")
    tc.content = body.content
    tc.edited = True
    db.commit()
    record_signal(db, current_user, task, "text_edit", candidate_id=tc.id, angle_label=tc.angle_label)
    return ok({"candidate_id": candidate_id, "edited": True})