from datetime import date, datetime, timedelta, timezone
from typing import Any

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

from app.auth.deps import get_current_user
from app.db.base import get_db
from app.db.models import User
from app.fitness.service import FitnessService
from app.fitness.structuring import structure_meal, structure_workout
from app.integrations.openfoodfacts import OpenFoodFactsClient
from app.integrations.wger import WgerClient

router = APIRouter()


class ProfileUpdate(BaseModel):
    sex: str | None = None
    age: int | None = None
    height_cm: float | None = None
    weight_kg: float | None = None
    goal: str | None = None
    target_weight_kg: float | None = None
    neat_base_kcal: float | None = Field(default=None, ge=200, le=300)
    activity_level: str | None = None
    weekly_workouts: int | None = Field(default=None, ge=0, le=14)
    baseline_steps: int | None = Field(default=None, ge=0)
    baseline_workout_kcal: float | None = Field(default=None, ge=0)


class MealCreate(BaseModel):
    text: str = Field(min_length=1)
    meal_type: str | None = None


class WaterCreate(BaseModel):
    amount_ml: int = Field(gt=0)


class WeightCreate(BaseModel):
    weight_kg: float = Field(gt=0)
    body_fat_pct: float | None = None
    chest_cm: float | None = None
    waist_cm: float | None = None
    neck_cm: float | None = None
    hip_cm: float | None = None
    notes: str = ""
    day: str | None = None
    days_ago: int | None = Field(default=None, ge=0, le=90)
    recorded_at: str | None = None


class BodyCompositionCalc(BaseModel):
    weight_kg: float | None = None
    height_cm: float | None = None
    sex: str | None = None
    neck_cm: float | None = None
    waist_cm: float | None = None
    hip_cm: float | None = None
    body_fat_pct: float | None = None


class StepsCreate(BaseModel):
    steps: int = Field(ge=0)
    active_calories: float | None = None
    notes: str = ""
    day: str | None = None
    days_ago: int | None = Field(default=None, ge=0, le=90)
    logged_at: str | None = None
    replace: bool = False


class StepsUpdate(BaseModel):
    steps: int | None = Field(default=None, ge=0)
    active_calories: float | None = None
    notes: str | None = None


class MealUpdate(BaseModel):
    description: str | None = None
    meal_type: str | None = None
    calories: float | None = Field(default=None, ge=0)
    protein_g: float | None = Field(default=None, ge=0)
    fat_g: float | None = Field(default=None, ge=0)
    carbs_g: float | None = Field(default=None, ge=0)
    fiber_g: float | None = Field(default=None, ge=0)
    estimated: bool | None = None


class WaterUpdate(BaseModel):
    amount_ml: int | None = Field(default=None, ge=0)


class LogMerge(BaseModel):
    kind: str = Field(description="meal|water|steps")
    keep_id: int
    merge_id: int


class DeleteLastLog(BaseModel):
    kind: str = Field(description="meal|water|steps|workout")
    day: str | None = None
    days_ago: int | None = Field(default=None, ge=0, le=90)


class WorkoutCreate(BaseModel):
    text: str = Field(min_length=1)
    day: str | None = None
    days_ago: int | None = Field(default=None, ge=0, le=90)
    logged_at: str | None = None


class ReminderUpdate(BaseModel):
    enabled: bool | None = None
    hour: int | None = Field(default=None, ge=0, le=23)
    minute: int | None = Field(default=None, ge=0, le=59)
    interval_hours: int | None = Field(default=None, ge=1, le=12)


@router.get("/fitness")
def get_snapshot(db: Session = Depends(get_db), user: User = Depends(get_current_user)) -> dict[str, Any]:
    return FitnessService(db, user.id).snapshot()


@router.get("/fitness/summary")
def get_summary(
    day: str | None = None,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    d = date.fromisoformat(day) if day else None
    return FitnessService(db, user.id).get_daily_summary(d)


@router.get("/fitness/workout-stats")
def get_workout_stats(
    days: int = 7,
    end: str | None = None,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    end_day = date.fromisoformat(end) if end else None
    return FitnessService(db, user.id).get_workout_stats(days=days, end_day=end_day)


@router.get("/fitness/history")
def get_history(
    days: int = 7,
    end: str | None = None,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    end_day = date.fromisoformat(end) if end else None
    return FitnessService(db, user.id).get_history(days=days, end_day=end_day)


@router.get("/fitness/charts")
def get_charts(
    weeks: int = 52,
    trend: bool = True,
    end: str | None = None,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    end_day = date.fromisoformat(end) if end else None
    return FitnessService(db, user.id).get_charts(weeks=weeks, trend=trend, end_day=end_day)


@router.get("/fitness/compare")
def compare_days(
    dates: str,
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict[str, Any]:
    parsed: list[date] = []
    for part in dates.split(","):
        part = part.strip()
        if part:
            parsed.append(date.fromisoformat(part))
    if len(parsed) < 2:
        raise HTTPException(status_code=400, detail="Provide at least two dates (YYYY-MM-DD,YYYY-MM-DD)")
    if len(parsed) > 14:
        raise HTTPException(status_code=400, detail="At most 14 dates")
    return FitnessService(db, user.id).compare_days(parsed)


@router.get("/fitness/profile")
def get_profile(db: Session = Depends(get_db), user: User = Depends(get_current_user)) -> dict[str, Any]:
    profile = FitnessService(db, user.id).get_profile()
    return profile or {"configured": False}


@router.put("/fitness/profile")
def update_profile(
    payload: ProfileUpdate,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    return FitnessService(db, user.id).set_profile(payload.model_dump(exclude_none=True))


@router.post("/fitness/profile/calc")
def calc_targets(
    payload: ProfileUpdate,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    params = payload.model_dump(exclude_none=True)
    if not params:
        raise HTTPException(status_code=400, detail="No parameters")
    return FitnessService(db, user.id).calc_targets(params)


@router.post("/fitness/meals")
async def create_meal(
    payload: MealCreate,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    service = FitnessService(db, user.id)
    try:
        structured = await structure_meal(payload.text)
    except Exception as exc:
        raise HTTPException(status_code=502, detail=str(exc)) from exc
    return service.log_meal(
        description=structured.get("description") or payload.text,
        meal_type=payload.meal_type or structured.get("meal_type") or "snack",
        calories=float(structured.get("calories") or 0),
        protein_g=float(structured.get("protein_g") or 0),
        fat_g=float(structured.get("fat_g") or 0),
        carbs_g=float(structured.get("carbs_g") or 0),
        fiber_g=float(structured.get("fiber_g") or 0),
        source="llm",
        estimated=bool(structured.get("estimated", True)),
    )


@router.post("/fitness/water")
def create_water(
    payload: WaterCreate,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    return FitnessService(db, user.id).log_water(payload.amount_ml)


@router.post("/fitness/weight")
def create_weight(
    payload: WeightCreate,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    day = date.fromisoformat(payload.day) if payload.day else None
    return FitnessService(db, user.id).log_weight(
        payload.weight_kg,
        body_fat_pct=payload.body_fat_pct,
        chest_cm=payload.chest_cm,
        waist_cm=payload.waist_cm,
        neck_cm=payload.neck_cm,
        hip_cm=payload.hip_cm,
        notes=payload.notes,
        recorded_at=payload.recorded_at,
        day=day,
        days_ago=payload.days_ago,
    )


@router.post("/fitness/body-composition/calc")
def calc_body_composition(
    payload: BodyCompositionCalc,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    return FitnessService(db, user.id).calc_body_composition(payload.model_dump(exclude_none=True))


@router.post("/fitness/steps")
def create_steps(
    payload: StepsCreate,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    day = date.fromisoformat(payload.day) if payload.day else None
    return FitnessService(db, user.id).log_steps(
        payload.steps,
        active_calories=payload.active_calories,
        notes=payload.notes,
        day=day,
        days_ago=payload.days_ago,
        logged_at=payload.logged_at,
        replace=payload.replace,
    )


@router.patch("/fitness/steps/{log_id}")
def update_steps(
    log_id: int,
    payload: StepsUpdate,
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict[str, Any]:
    updates = payload.model_dump(exclude_unset=True)
    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")
    result = FitnessService(db, user.id).update_step_log(log_id, updates)
    if not result:
        raise HTTPException(status_code=404, detail="Not found")
    return result


@router.delete("/fitness/steps/{log_id}")
def delete_steps(log_id: int, db: Session = Depends(get_db), user: User = Depends(get_current_user)) -> dict[str, bool]:
    if not FitnessService(db, user.id).delete_step_log(log_id):
        raise HTTPException(status_code=404, detail="Not found")
    return {"ok": True}


@router.post("/fitness/workouts")
async def create_workout(
    payload: WorkoutCreate,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    service = FitnessService(db, user.id)
    try:
        structured = await structure_workout(payload.text)
    except Exception as exc:
        raise HTTPException(status_code=502, detail=str(exc)) from exc
    day = date.fromisoformat(payload.day) if payload.day else None
    return service.log_workout(
        title=structured.get("title") or "Тренировка",
        notes=structured.get("notes") or payload.text,
        duration_min=structured.get("duration_min"),
        exercises=structured.get("exercises"),
        active_calories=structured.get("active_calories"),
        total_calories=structured.get("total_calories"),
        steps=structured.get("steps"),
        activity_type=structured.get("activity_type"),
        met=structured.get("met"),
        day=day,
        days_ago=payload.days_ago,
        logged_at=payload.logged_at,
    )


@router.get("/fitness/body-metrics")
def list_metrics(
    limit: int = 30,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> list[dict[str, Any]]:
    return FitnessService(db, user.id).list_body_metrics(limit=limit)


@router.patch("/fitness/meals/{log_id}")
def update_meal(
    log_id: int,
    payload: MealUpdate,
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict[str, Any]:
    updates = payload.model_dump(exclude_unset=True)
    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")
    result = FitnessService(db, user.id).update_food_log(log_id, updates)
    if not result:
        raise HTTPException(status_code=404, detail="Not found")
    return result


@router.patch("/fitness/water/{log_id}")
def update_water(
    log_id: int,
    payload: WaterUpdate,
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict[str, Any]:
    updates = payload.model_dump(exclude_unset=True)
    if not updates:
        raise HTTPException(status_code=400, detail="No fields to update")
    result = FitnessService(db, user.id).update_water_log(log_id, updates)
    if not result:
        raise HTTPException(status_code=404, detail="Not found")
    return result


@router.post("/fitness/logs/merge")
def merge_logs(
    payload: LogMerge,
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict[str, Any]:
    service = FitnessService(db, user.id)
    kind = payload.kind.lower().strip()
    if kind in ("meal", "meals", "food"):
        result = service.merge_food_logs(payload.keep_id, payload.merge_id)
    elif kind == "water":
        result = service.merge_water_logs(payload.keep_id, payload.merge_id)
    elif kind in ("step", "steps"):
        result = service.merge_step_logs(payload.keep_id, payload.merge_id)
    else:
        raise HTTPException(status_code=400, detail="Unsupported kind")
    if not result:
        raise HTTPException(status_code=404, detail="Not found")
    return result


@router.post("/fitness/logs/delete-last")
def delete_last_log(
    payload: DeleteLastLog,
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
) -> dict[str, Any]:
    day = date.fromisoformat(payload.day) if payload.day else None
    if day is None and payload.days_ago is not None:
        day = datetime.now(timezone.utc).date() - timedelta(days=int(payload.days_ago))
    result = FitnessService(db, user.id).delete_last_log(payload.kind, day=day)
    if not result:
        raise HTTPException(status_code=404, detail="No records found")
    return result


@router.delete("/fitness/meals/{log_id}")
def delete_meal(log_id: int, db: Session = Depends(get_db), user: User = Depends(get_current_user)) -> dict[str, bool]:
    if not FitnessService(db, user.id).delete_food_log(log_id):
        raise HTTPException(status_code=404, detail="Not found")
    return {"ok": True}


@router.delete("/fitness/water/{log_id}")
def delete_water(log_id: int, db: Session = Depends(get_db), user: User = Depends(get_current_user)) -> dict[str, bool]:
    if not FitnessService(db, user.id).delete_water_log(log_id):
        raise HTTPException(status_code=404, detail="Not found")
    return {"ok": True}


@router.delete("/fitness/workouts/{log_id}")
def delete_workout(log_id: int, db: Session = Depends(get_db), user: User = Depends(get_current_user)) -> dict[str, bool]:
    if not FitnessService(db, user.id).delete_workout_log(log_id):
        raise HTTPException(status_code=404, detail="Not found")
    return {"ok": True}


@router.get("/fitness/reminders")
def list_reminders(db: Session = Depends(get_db), user: User = Depends(get_current_user)) -> list[dict[str, Any]]:
    return FitnessService(db, user.id).list_reminders()


@router.put("/fitness/reminders/{kind}")
def update_reminder(
    kind: str,
    payload: ReminderUpdate,
    db: Session = Depends(get_db), user: User = Depends(get_current_user),
) -> dict[str, Any]:
    return FitnessService(db, user.id).set_reminder(
        kind,
        enabled=payload.enabled,
        hour=payload.hour,
        minute=payload.minute,
        interval_hours=payload.interval_hours,
    )


@router.get("/fitness/lookup/food")
def lookup_food(q: str, limit: int = 5) -> list[dict[str, Any]]:
    return OpenFoodFactsClient().search(q, limit=limit)


@router.get("/fitness/lookup/exercise")
def lookup_exercise(q: str, limit: int = 8) -> list[dict[str, Any]]:
    return WgerClient().search_exercises(q, limit=limit)