"""Human schedule/plan routes: CRUD, feedback, priors, templates, reschedule.

Session-authenticated; mirrors the app envelope pattern.
"""

from __future__ import annotations

import json
from datetime import date
from typing import Any

from fastapi import APIRouter, Depends, Request, status
from fastapi.responses import Response
from pydantic import BaseModel

from app.chat_plan import (
    ChatPlanError,
    chat_plan_to_day_put,
    plan_and_feedback_to_chat_plan,
    unwrap_import_payload,
)
from app.deps import require_login
from app.models import ApiEnvelope, err, ok
from app.schedule_math import capacity_hint, trigger_operators
from app.schedule_reschedule import seed_starter_blocks
from app.schedule_risk import risk_from_stores
from app.schedule_store import (
    BlockCheckBody,
    BlockCreate,
    BlockFeedback,
    BlockPatch,
    DayPlanPut,
    PlanMetaPatch,
)

router = APIRouter(tags=["plan"], dependencies=[Depends(require_login)])


class RescheduleBody(BaseModel):
    reason: str = "user"
    force: bool = False


class FeedbackBody(BlockFeedback):
    block_id: str = ""
    date: str | None = None


def _store(request: Request):
    return request.app.state.schedule_store


def _risk_bundle(request: Request, target: date | None = None) -> dict[str, Any]:
    risk = risk_from_stores(
        request.app.state.entry_store,
        request.app.state.daily_store,
        target_day=target,
    )
    cap = capacity_hint(
        risk_1h_score=risk["risk_1h_score"],
        triggers_yesterday=risk["triggers_yesterday"],
        yesterday_trigger=risk["yesterday_trigger"],
        last_hour_high=risk["last_hour_high"],
    )
    ops = trigger_operators(
        risk_1h_tags=risk["risk_1h_tags"],
        triggers_yesterday=risk["triggers_yesterday"],
    )
    return {**risk, "capacity_hint": cap, "operators": ops}


def _enrich_plan(request: Request, day: date) -> dict[str, Any]:
    data = _store(request).plan_with_feedback(day.isoformat())
    bundle = _risk_bundle(request, day)
    data["capacity_hint"] = bundle["capacity_hint"]
    data["operators"] = bundle["operators"]
    data["risk_1h"] = {
        "score": bundle["risk_1h_score"],
        "tags": bundle["risk_1h_tags"],
        "high": bundle["last_hour_high"],
    }
    data["triggers_yesterday"] = bundle["triggers_yesterday"]
    return data


def _feedback_map(store: Any, day: str) -> dict[str, dict[str, Any]]:
    by_block: dict[str, dict[str, Any]] = {}
    for row in store.feedback_for_plan(day):
        bid = str(row.get("block_id") or "")
        if bid:
            by_block[bid] = row
    return by_block


@router.get("/api/plan/{day}", response_model=ApiEnvelope)
def get_plan(request: Request, day: date) -> dict[str, Any]:
    return ok(_enrich_plan(request, day))


@router.put("/api/plan/{day}", response_model=ApiEnvelope)
def put_plan(request: Request, day: date, body: DayPlanPut) -> object:
    try:
        put = body.model_copy(update={"source": body.source or "user"})
        _store(request).save_plan(day.isoformat(), put)
        return ok(_enrich_plan(request, day))
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)


@router.post("/api/plan/{day}/blocks", response_model=ApiEnvelope)
def add_block(request: Request, day: date, body: BlockCreate) -> object:
    try:
        _store(request).add_block(day.isoformat(), body)
        return ok(_enrich_plan(request, day))
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)


@router.patch("/api/plan/{day}/blocks/{block_id}", response_model=ApiEnvelope)
def patch_block(
    request: Request,
    day: date,
    block_id: str,
    body: BlockPatch,
) -> object:
    try:
        _store(request).patch_block(day.isoformat(), block_id, body)
        return ok(_enrich_plan(request, day))
    except KeyError:
        return err("not_found", "Block not found", status.HTTP_404_NOT_FOUND)
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)


@router.delete("/api/plan/{day}/blocks/{block_id}", response_model=ApiEnvelope)
def delete_block(request: Request, day: date, block_id: str) -> object:
    try:
        _store(request).delete_block(day.isoformat(), block_id)
        return ok(_enrich_plan(request, day))
    except KeyError:
        return err("not_found", "Block not found", status.HTTP_404_NOT_FOUND)


@router.post("/api/plan/{day}/blocks/{block_id}/feedback", response_model=ApiEnvelope)
def post_feedback(
    request: Request,
    day: date,
    block_id: str,
    body: FeedbackBody,
) -> object:
    fb = body.model_copy(update={"block_id": block_id, "date": day.isoformat()})
    try:
        stored, _plan = _store(request).submit_feedback(day.isoformat(), fb)
        return ok(
            {
                "feedback": stored.model_dump(mode="json"),
                "plan": _enrich_plan(request, day),
                "priors": list(_store(request).load_priors().values()),
            }
        )
    except KeyError:
        return err("not_found", "Block not found", status.HTTP_404_NOT_FOUND)


@router.post("/api/plan/{day}/blocks/{block_id}/check", response_model=ApiEnvelope)
def check_block(
    request: Request,
    day: date,
    block_id: str,
    body: BlockCheckBody,
) -> object:
    """Fast checkbox — status only, no full feedback required."""

    try:
        _store(request).patch_block(
            day.isoformat(),
            block_id,
            BlockPatch(status=body.status),
        )
        if body.status == "skipped" and body.skip_reason:
            try:
                _store(request).submit_feedback(
                    day.isoformat(),
                    BlockFeedback(
                        block_id=block_id,
                        date=day.isoformat(),
                        did="skipped",
                        skip_reason=body.skip_reason,
                    ),
                )
            except KeyError:
                pass
        return ok(_enrich_plan(request, day))
    except KeyError:
        return err("not_found", "Block not found", status.HTTP_404_NOT_FOUND)
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)


@router.patch("/api/plan/{day}/meta", response_model=ApiEnvelope)
def patch_plan_meta(request: Request, day: date, body: PlanMetaPatch) -> object:
    try:
        _store(request).patch_meta(day.isoformat(), body)
        return ok(_enrich_plan(request, day))
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)


@router.post("/api/plan/{day}/import", response_model=ApiEnvelope)
def import_chat_plan(request: Request, day: date, body: dict[str, Any]) -> object:
    store = _store(request)
    day_s = day.isoformat()
    try:
        chat, mode = unwrap_import_payload(body)
        current = store.get_plan(day_s)
        put, feedbacks, warnings = chat_plan_to_day_put(
            chat,
            day_s,
            max_blocks=request.app.state.settings.schedule_max_blocks,
            previous_blocks=[b.model_dump() for b in current.blocks],
            mode=mode,
        )
        store.save_plan(day_s, put, bump_version=True)
        for fb in feedbacks:
            try:
                store.submit_feedback(day_s, fb)
            except KeyError:
                warnings.append(f"feedback skipped for missing block {fb.block_id}")
        data = _enrich_plan(request, day)
        data["import_warnings"] = warnings
        data["import_mode"] = mode
        return ok(data)
    except ChatPlanError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)


@router.get("/api/plan/{day}/export", response_model=ApiEnvelope)
def export_chat_plan(request: Request, day: date) -> dict[str, Any]:
    store = _store(request)
    day_s = day.isoformat()
    plan = store.get_plan(day_s)
    chat = plan_and_feedback_to_chat_plan(plan, _feedback_map(store, day_s))
    return ok(chat)


@router.get("/api/plan/{day}/export.txt")
def export_chat_plan_file(request: Request, day: date) -> Response:
    store = _store(request)
    day_s = day.isoformat()
    plan = store.get_plan(day_s)
    chat = plan_and_feedback_to_chat_plan(plan, _feedback_map(store, day_s))
    body = json.dumps(chat, ensure_ascii=False, indent=2) + "\n"
    return Response(
        content=body,
        media_type="application/json",
        headers={
            "Content-Disposition": f'attachment; filename="plan-{day_s}.json"'
        },
    )


@router.post("/api/plan/{day}/seed", response_model=ApiEnvelope)
def seed_plan(request: Request, day: date) -> object:
    """Fill an empty day from templates under live capacity (P0 locked)."""

    store = _store(request)
    existing = store.get_plan(day.isoformat())
    if existing.blocks:
        return err(
            "validation_error",
            "Day already has blocks — clear or reschedule instead",
            status.HTTP_422_UNPROCESSABLE_ENTITY,
        )
    bundle = _risk_bundle(request, day)
    blocks = seed_starter_blocks(
        day.isoformat(),
        capacity_hint=bundle["capacity_hint"],
        max_blocks=request.app.state.settings.schedule_max_blocks,
    )
    try:
        store.save_plan(
            day.isoformat(),
            DayPlanPut(
                blocks=blocks,
                source="rules",
                capacity_hint=bundle["capacity_hint"],
                notes="seed",
                force_p0_move=True,
            ),
        )
        data = _enrich_plan(request, day)
        data["seeded"] = True
        return ok(data)
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)


@router.get("/api/schedule/priors", response_model=ApiEnvelope)
def get_priors(request: Request) -> dict[str, Any]:
    kinds = _store(request).load_priors()
    return ok({"kinds": list(kinds.values()), "markdown": _store(request).priors_table()})


@router.get("/api/schedule/templates", response_model=ApiEnvelope)
def get_templates(request: Request) -> dict[str, Any]:
    return ok({"items": _store(request).templates()})


@router.get("/api/plan/{day}/health", response_model=ApiEnvelope)
def get_health(request: Request, day: date) -> dict[str, Any]:
    return ok(_store(request).health(day.isoformat()))


@router.post("/api/plan/{day}/reschedule", response_model=ApiEnvelope)
def reschedule(request: Request, day: date, body: RescheduleBody | None = None) -> object:
    payload = body or RescheduleBody()
    bundle = _risk_bundle(request, day)
    try:
        result = request.app.state.reschedule_service.reschedule(
            day.isoformat(),
            reason=payload.reason,
            force=payload.force,
            risk_score=bundle["risk_1h_score"],
            capacity_hint=bundle["capacity_hint"],
            priors_md=_store(request).priors_table(),
            context_notes=(
                f"risk_tags={bundle['risk_1h_tags']}; "
                f"triggers_y={bundle['triggers_yesterday']}; "
                f"operators={bundle['operators']}"
            ),
        )
        result["operators"] = bundle["operators"]
        result["capacity_hint"] = bundle["capacity_hint"]
        if "plan" in result:
            plan = result["plan"]
            if isinstance(plan, dict):
                plan["capacity_hint"] = bundle["capacity_hint"]
                plan["operators"] = bundle["operators"]
        return ok(result)
    except PermissionError as exc:
        return err("rate_limited", str(exc), status.HTTP_429_TOO_MANY_REQUESTS)
    except ValueError as exc:
        return err("validation_error", str(exc), status.HTTP_422_UNPROCESSABLE_ENTITY)