from __future__ import annotations

from typing import Optional

from fastapi import APIRouter, Depends, Header, Query
from starlette.responses import JSONResponse

from app.db import normalize_client_id, pop_next_health, pop_next_measure
from app.services.water_video import get_water_video_public_url
from app.settings import Settings, get_settings

router = APIRouter(prefix="/api/v1/biomass", tags=["biomass"])

# 是否有新快照被本次 GET 消费（1/0）；body 保持与客户端约定字段一致，不写入 has_new。
HEADER_BIOMASS_NEW = "X-Fish-Biomass-New"


def _new_headers(has_new: bool) -> dict[str, str]:
    return {HEADER_BIOMASS_NEW: "1" if has_new else "0"}


def _resolve_client_id(
    x_fish_client_id: Optional[str] = Header(None, alias="X-Fish-Client-Id"),
    client_id: Optional[str] = Query(
        None,
        description="客户端标识；与请求头 X-Fish-Client-Id 二选一（优先头）。未带时共用 default 游标",
    ),
) -> str:
    if x_fish_client_id is not None and str(x_fish_client_id).strip():
        return normalize_client_id(x_fish_client_id)
    if client_id is not None and str(client_id).strip():
        return normalize_client_id(client_id)
    return normalize_client_id(None)


@router.get("/real/camera/")
async def get_real_camera(
    settings: Settings = Depends(get_settings),
    client_id: str = Depends(_resolve_client_id),
):
    """双目实时结果：每次 GET 投递该客户端下一条未消费的 FishMeasure 快照（按 client_id 独立游标）。"""
    m, has_new, _ = pop_next_measure(settings, client_id)
    if not has_new:
        return JSONResponse(
            content={
                "code": 200,
                "msg": "成功",
                "data": {
                    "result": [],
                    "video_left": "",
                    "video_right": "",
                },
            },
            headers=_new_headers(False),
        )
    if m.error:
        return JSONResponse(
            content={
                "code": 500,
                "msg": m.error,
                "data": {
                    "result": [],
                    "video_left": "",
                    "video_right": "",
                },
            },
            headers=_new_headers(True),
        )
    return JSONResponse(
        content={
            "code": 200,
            "msg": "成功",
            "data": {
                "result": m.result,
                "video_left": m.video_left,
                "video_right": m.video_right,
            },
        },
        headers=_new_headers(True),
    )


@router.get("/health/result/")
async def get_health_result(
    settings: Settings = Depends(get_settings),
    client_id: str = Depends(_resolve_client_id),
):
    """行为 / 健康结果：每次 GET 投递该客户端下一条未消费的 FishAction 快照（按 client_id 独立游标）。

    每个视频切片被视为独立的视频，会分别投递。
    """
    h, has_new, _ = pop_next_health(settings, client_id)
    if not has_new:
        return JSONResponse(
            content={
                "code": 200,
                "msg": "成功",
                "data": {
                    "behavior_result": "",
                    "health_result": "",
                },
            },
            headers=_new_headers(False),
        )
    if h.error:
        return JSONResponse(
            content={
                "code": 500,
                "msg": h.error,
                "data": {
                    "behavior_result": "",
                    "health_result": "",
                },
            },
            headers=_new_headers(True),
        )
    return JSONResponse(
        content={
            "code": 200,
            "msg": "成功",
            "data": {
                "behavior_result": h.behavior_result,
                "health_result": h.health_result,
            },
        },
        headers=_new_headers(True),
    )


@router.get("/water/video/")
async def get_water_video(
    settings: Settings = Depends(get_settings),
    client_id: str = Depends(_resolve_client_id),
):
    """水上视频：FishAction 输入 mp4 经 H.264 转码后托管在 /media/，返回 `video_path` 绝对 URL。

    如果视频较长（超过15秒），会自动切分为多个10秒的片段。
    每个切片被视为独立的视频，每次调用返回一个切片的URL（按顺序轮流返回）。

    对齐机制：使用 client_id 参数（请求头 X-Fish-Client-Id 或查询参数 client_id）
    确保与 /health/result/ 端点对齐返回同一切片。
    """
    video_path = await get_water_video_public_url(settings, client_id)
    return JSONResponse(
        content={
            "code": 200,
            "msg": "成功",
            "data": {
                "video_path": video_path,
            },
        },
    )


@router.get("/sonar/video/")
async def get_sonar_video():
    """声纳图像信息：当前返回空 `video_path`；后续将提供 H.264 编码 MP4 的绝对 URL。"""
    return JSONResponse(
        content={
            "code": 200,
            "msg": "成功",
            "data": {
                "video_path": "",
            },
        },
    )