from __future__ import annotations

from datetime import datetime
from typing import Any, Literal

from fastapi import APIRouter, HTTPException, Query, Request
from pydantic import BaseModel, Field

from api.services.business_harness import (
    get_platform_demand_history,
    get_published_demand_package,
)
from supply_infra.business_harness.content_feedback import (
    ingest_content_performance_fact,
)
from supply_infra.business_harness.feedback import process_feedback
from supply_infra.business_harness.strategy import (
    approve_strategy_proposal,
    create_strategy_proposal,
    preview_strategy_proposal,
)

router = APIRouter(prefix="/api/business-harness", tags=["business-harness"])


class ProcessFeedbackBody(BaseModel):
    status: Literal["accepted", "rejected", "needs_evidence"]
    reason: str = Field(min_length=1, max_length=2000)
    impact: dict[str, Any] | None = None


class ContentPerformanceBody(BaseModel):
    content_id: str = Field(min_length=1, max_length=128)
    biz_dt: str = Field(pattern=r"^\d{8}$")
    source: str = Field(min_length=1, max_length=64)
    raw_payload: dict[str, Any] = Field(default_factory=dict)
    observed_at: datetime
    exposure_count: int | None = Field(default=None, ge=0)
    sample_size: int | None = Field(default=None, ge=0)
    content_quality: float | None = Field(default=None, ge=0, le=1)
    rov: float | None = None
    vov: float | None = None


class StrategyProposalBody(BaseModel):
    requested_change: dict[str, Any]
    reason: str = Field(min_length=1, max_length=2000)


@router.get("/packages/latest")
def latest_package(
    biz_dt: str | None = Query(default=None, pattern=r"^\d{8}$"),
    run_id: str | None = None,
) -> dict:
    result = get_published_demand_package(biz_dt=biz_dt, run_id=run_id)
    if result is None:
        raise HTTPException(status_code=404, detail="published demand package not found")
    return result


@router.get("/demands/{platform_demand_id}/history")
def demand_history(platform_demand_id: str) -> dict:
    result = get_platform_demand_history(platform_demand_id)
    if result is None:
        raise HTTPException(status_code=404, detail="platform demand not found")
    return result


@router.post("/feedback/{feedback_id}/process")
def review_feedback(
    feedback_id: int,
    body: ProcessFeedbackBody,
    request: Request,
) -> dict:
    try:
        return process_feedback(
            feedback_id,
            status=body.status,
            processor=str(request.state.current_user["username"]),
            reason=body.reason,
            impact=body.impact,
        )
    except LookupError as exc:
        raise HTTPException(status_code=404, detail=str(exc)) from exc
    except RuntimeError as exc:
        raise HTTPException(status_code=409, detail=str(exc)) from exc


@router.post("/content-performance")
def ingest_content_performance(body: ContentPerformanceBody) -> dict:
    return ingest_content_performance_fact(**body.model_dump())


@router.post("/strategy/proposals")
def propose_strategy(body: StrategyProposalBody, request: Request) -> dict:
    try:
        return create_strategy_proposal(
            requested_change=body.requested_change,
            reason=body.reason,
            created_by=str(request.state.current_user["username"]),
        )
    except (ValueError, RuntimeError) as exc:
        raise HTTPException(status_code=409, detail=str(exc)) from exc


@router.post("/strategy/proposals/{proposal_id}/preview")
def preview_strategy(proposal_id: str) -> dict:
    try:
        return preview_strategy_proposal(proposal_id)
    except LookupError as exc:
        raise HTTPException(status_code=404, detail=str(exc)) from exc
    except RuntimeError as exc:
        raise HTTPException(status_code=409, detail=str(exc)) from exc


@router.post("/strategy/proposals/{proposal_id}/approve")
def approve_strategy(proposal_id: str, request: Request) -> dict:
    try:
        return approve_strategy_proposal(
            proposal_id,
            approved_by=str(request.state.current_user["username"]),
        )
    except LookupError as exc:
        raise HTTPException(status_code=404, detail=str(exc)) from exc
    except RuntimeError as exc:
        raise HTTPException(status_code=409, detail=str(exc)) from exc