from __future__ import annotations

import os

from fastapi import FastAPI, HTTPException, Query
from fastapi.exceptions import RequestValidationError
from fastapi.encoders import jsonable_encoder
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse

from content_agent.dashboard_service import DashboardService
from content_agent.errors import ErrorCode, error_response, sanitize_error_detail
from content_agent.run_service import RunService
from content_agent.schemas import (
    ConfigFileResponse,
    ContentItemsResponse,
    DashboardResponse,
    JsonFileResponse,
    PlatformCatalogResponse,
    PlatformDescriptor,
    QueryListResponse,
    RecordsResponse,
    RunListResponse,
    RunStartRequest,
    RunStartResponse,
    RunSummaryResponse,
    RuntimeFileResponse,
    RuntimeFilesResponse,
    TimelineResponse,
    ValidationResponse,
)


app = FastAPI(title="Content Agent V1")
service = RunService.from_env()

_cors_origins = [
    origin.strip()
    for origin in os.environ.get(
        "CONTENT_AGENT_WEB_CORS_ORIGINS",
        "http://localhost:3000,http://127.0.0.1:3000,http://localhost:3010,http://127.0.0.1:3010",
    ).split(",")
    if origin.strip()
]
if _cors_origins:
    app.add_middleware(
        CORSMiddleware,
        allow_origins=_cors_origins,
        allow_credentials=False,
        allow_methods=["GET", "POST", "OPTIONS"],
        allow_headers=["*"],
    )


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request, exc: RequestValidationError):
    return JSONResponse(
        status_code=422,
        content={
            "detail": error_response(
                ErrorCode.INVALID_REQUEST,
                "invalid request",
                {"errors": jsonable_encoder(sanitize_error_detail(exc.errors()))},
            )
        },
    )


@app.post("/runs", response_model=RunStartResponse)
def start_run(request: RunStartRequest) -> RunStartResponse:
    state = service.start_run(request)
    if state["status"] not in {"success", "partial_success"}:
        detail = error_response(
            state.get("error_code", ErrorCode.RUN_START_FAILED),
            state.get("error_message", "run failed"),
            state.get("error_detail", {"errors": state.get("errors", [])}),
        )
        raise HTTPException(status_code=state.get("http_status_code", 500), detail=detail)
    run_id = state["run_id"]
    return RunStartResponse(
        run_id=run_id,
        policy_run_id=state["policy_run_id"],
        status=state["status"],
        policy_bundle_id=state["policy_bundle_id"],
        strategy_version=state["strategy_version"],
        platform=state["platform"],
        platform_mode=state["platform_mode"],
        output_dir=str(service.runtime.run_dir(run_id)),
    )


@app.get("/runs", response_model=RunListResponse)
def list_runs(
    status: str | None = None,
    platform: str | None = None,
    platform_mode: str | None = None,
    strategy_version: str | None = None,
    validation_status: str | None = None,
    error_code: str | None = None,
    page: int = Query(default=1, ge=1),
    page_size: int = Query(default=20, ge=1, le=100),
) -> RunListResponse:
    return RunListResponse(
        **_dashboard_service().list_runs(
            status=status,
            platform=platform,
            platform_mode=platform_mode,
            strategy_version=strategy_version,
            validation_status=validation_status,
            error_code=error_code,
            page=page,
            page_size=page_size,
        )
    )


@app.get("/runs/{run_id}", response_model=RunSummaryResponse)
def get_run(run_id: str) -> RunSummaryResponse:
    _ensure_run_exists(run_id)
    return RunSummaryResponse(**service.get_summary(run_id))


_CONFIG_FILES = {
    "rule-packs": "product_documents/规则包/douyin_rule_packs.v1.json",
    "walk-strategy": "product_documents/抖音游走策略/douyin_walk_strategy.v1.json",
    "query-prompts": "product_documents/配置/query_prompts.v1.json",
    "walk-policy": "tech_documents/数据接口与来源/walk_policy.json",
}


def _config_file_response(key: str) -> ConfigFileResponse:
    from pathlib import Path

    from content_agent.integrations import config_store

    path = Path(_CONFIG_FILES[key])
    if not path.exists():
        raise HTTPException(status_code=404, detail=error_response(
            ErrorCode.RUN_NOT_FOUND, f"config file missing: {key}", {"source_file": str(path)}
        ))
    data, _ = config_store.load_json(path)
    return ConfigFileResponse(source_file=str(path), data=data)


@app.get("/config/rule-packs", response_model=ConfigFileResponse)
def get_config_rule_packs() -> ConfigFileResponse:
    return _config_file_response("rule-packs")


@app.get("/config/walk-strategy", response_model=ConfigFileResponse)
def get_config_walk_strategy() -> ConfigFileResponse:
    return _config_file_response("walk-strategy")


@app.get("/config/query-prompts", response_model=ConfigFileResponse)
def get_config_query_prompts() -> ConfigFileResponse:
    return _config_file_response("query-prompts")


@app.get("/config/walk-policy", response_model=ConfigFileResponse)
def get_config_walk_policy() -> ConfigFileResponse:
    # 返回原始 JSON 不解包 {value,provenance,tbd}:展示层保留拍板留痕,解包由前端做。
    return _config_file_response("walk-policy")


_PLATFORM_PROFILE_DIR = "tech_documents/数据接口与来源/platform_profiles"


@app.get("/config/platforms", response_model=PlatformCatalogResponse)
def get_config_platforms() -> PlatformCatalogResponse:
    # 平台展示目录:从 platform_profiles/*.json 派生每平台的 label + 真实可得互动指标(heat 字段)。
    # 前端按此渲染平台名与互动数据——加平台只改 profile JSON,前端零改动。
    from pathlib import Path

    from content_agent.integrations import config_store

    catalog: dict[str, PlatformDescriptor] = {}
    profile_dir = Path(_PLATFORM_PROFILE_DIR)
    for path in sorted(profile_dir.glob("*.json")):
        try:
            data, _ = config_store.load_json(path)
        except (FileNotFoundError, OSError, ValueError):
            continue
        platform = str(data.get("platform") or path.stem)
        heat_fields = [
            str(sig["field"])
            for sig in ((data.get("heat") or {}).get("signals") or [])
            if isinstance(sig, dict) and sig.get("field")
        ]
        catalog[platform] = PlatformDescriptor(
            platform=platform,
            label=str(data.get("platform_label") or platform),
            status=data.get("status"),
            heat_fields=heat_fields,
        )
    return PlatformCatalogResponse(platforms=catalog)


@app.get("/runs/{run_id}/dashboard", response_model=DashboardResponse)
def get_run_dashboard(run_id: str) -> DashboardResponse:
    _ensure_web_run_exists(run_id)
    return DashboardResponse(**_dashboard_service().dashboard(run_id))


@app.get("/runs/{run_id}/queries", response_model=QueryListResponse)
def get_run_queries(run_id: str) -> QueryListResponse:
    _ensure_web_run_exists(run_id)
    return QueryListResponse(**_dashboard_service().queries(run_id))


@app.get("/runs/{run_id}/timeline", response_model=TimelineResponse)
def get_run_timeline(run_id: str) -> TimelineResponse:
    _ensure_web_run_exists(run_id)
    return TimelineResponse(**_dashboard_service().timeline(run_id))


@app.get("/runs/{run_id}/content-items", response_model=ContentItemsResponse)
def get_run_content_items(run_id: str) -> ContentItemsResponse:
    _ensure_web_run_exists(run_id)
    return ContentItemsResponse(**_dashboard_service().content_items(run_id))


@app.get("/runs/{run_id}/runtime-files", response_model=RuntimeFilesResponse)
def get_run_runtime_files(run_id: str) -> RuntimeFilesResponse:
    _ensure_web_run_exists(run_id)
    return RuntimeFilesResponse(**_dashboard_service().runtime_files(run_id))


@app.get("/runs/{run_id}/runtime-files/{filename}", response_model=RuntimeFileResponse)
def get_run_runtime_file(
    run_id: str,
    filename: str,
    limit: int = Query(default=100, ge=1, le=500),
    offset: int = Query(default=0, ge=0),
) -> RuntimeFileResponse:
    _ensure_web_run_exists(run_id)
    try:
        return RuntimeFileResponse(
            **_dashboard_service().runtime_file(
                run_id,
                filename,
                limit=limit,
                offset=offset,
            )
        )
    except ValueError:
        raise HTTPException(
            status_code=400,
            detail=error_response(
                ErrorCode.INVALID_REQUEST,
                "runtime filename is not allowed",
                {"filename": filename},
            ),
        )


@app.get("/runs/{run_id}/discovered-content-items", response_model=RecordsResponse)
def get_discovered_content_items(run_id: str) -> RecordsResponse:
    return _jsonl_response(run_id, "discovered_content_items.jsonl")


@app.get("/runs/{run_id}/rule-decisions", response_model=RecordsResponse)
def get_rule_decisions(run_id: str) -> RecordsResponse:
    return _jsonl_response(run_id, "rule_decisions.jsonl")


@app.get("/runs/{run_id}/source-path-records", response_model=RecordsResponse)
def get_source_path_records(run_id: str) -> RecordsResponse:
    return _jsonl_response(run_id, "source_path_records.jsonl")


@app.get("/runs/{run_id}/final-output", response_model=JsonFileResponse)
def get_final_output(run_id: str) -> JsonFileResponse:
    return _json_response(run_id, "final_output.json")


@app.get("/runs/{run_id}/strategy-review", response_model=JsonFileResponse)
def get_strategy_review(run_id: str) -> JsonFileResponse:
    _ensure_run_exists(run_id)
    return JsonFileResponse(run_id=run_id, data=service.strategy_review(run_id))


@app.post("/runs/{run_id}/strategy-review/regenerate", response_model=JsonFileResponse)
def regenerate_strategy_review(run_id: str) -> JsonFileResponse:
    _ensure_run_exists(run_id)
    return JsonFileResponse(run_id=run_id, data=service.regenerate_strategy_review(run_id))


@app.get("/runs/{run_id}/validation", response_model=ValidationResponse)
def get_validation(run_id: str) -> ValidationResponse:
    _ensure_run_exists(run_id)
    return ValidationResponse(**service.validate_run(run_id))


def _jsonl_response(run_id: str, filename: str) -> RecordsResponse:
    _ensure_run_exists(run_id)
    return RecordsResponse(run_id=run_id, records=service.read_jsonl(run_id, filename))


def _json_response(run_id: str, filename: str) -> JsonFileResponse:
    _ensure_run_exists(run_id)
    return JsonFileResponse(run_id=run_id, data=service.read_json(run_id, filename))


def _ensure_run_exists(run_id: str) -> None:
    if not service.runtime.run_dir(run_id).exists():
        raise HTTPException(
            status_code=404,
            detail=error_response(
                ErrorCode.RUN_NOT_FOUND,
                "run not found",
                {"run_id": run_id},
            ),
        )


def _ensure_web_run_exists(run_id: str) -> None:
    if not _dashboard_service().run_exists(run_id):
        raise HTTPException(
            status_code=404,
            detail=error_response(
                ErrorCode.RUN_NOT_FOUND,
                "run not found",
                {"run_id": run_id},
            ),
        )


def _dashboard_service() -> DashboardService:
    return DashboardService.from_runtime(service.runtime)