// src/api/targets.rs
use axum::{
    extract::{Query, State},
    http::StatusCode,
    Json,
};
use serde::{Deserialize, Serialize};
use std::sync::Arc;

use super::AppState;
use crate::services::target::{query_target_cached, TargetInfo};

#[derive(Deserialize)]
pub struct TargetQueryParams {
    pub object_name: String,
}

#[derive(Deserialize)]
pub struct AssociateTargetRequest {
    pub bibcode: String,
    pub object_name: String,
}

#[derive(Deserialize)]
pub struct TargetListParams {
    pub bibcode: String,
}

#[derive(Serialize)]
pub struct AssociateResponse {
    pub status: String,
    pub target: TargetInfo,
}

// ── GET /api/target/query ──
pub async fn query_target(
    State(state): State<Arc<AppState>>,
    Query(params): Query<TargetQueryParams>,
) -> Result<Json<TargetInfo>, (StatusCode, String)> {
    let client = reqwest::Client::new();
    let info = query_target_cached(&state.db, &params.object_name, None, &client)
        .await
        .map_err(|e| {
            tracing::error!("查询天体信息失败 ({}): {}", params.object_name, e);
            (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("查询天体信息失败: {}", e),
            )
        })?;

    Ok(Json(info))
}

// ── POST /api/target/associate ──
pub async fn associate_target(
    State(state): State<Arc<AppState>>,
    Json(req): Json<AssociateTargetRequest>,
) -> Result<Json<AssociateResponse>, (StatusCode, String)> {
    let client = reqwest::Client::new();

    // 查询并将结果缓存/关联到对应文献
    let info = query_target_cached(&state.db, &req.object_name, Some(&req.bibcode), &client)
        .await
        .map_err(|e| {
            tracing::error!(
                "手动关联天体失败 ({} -> {}): {}",
                req.object_name,
                req.bibcode,
                e
            );
            (
                StatusCode::INTERNAL_SERVER_ERROR,
                format!("手动关联天体失败: {}", e),
            )
        })?;

    Ok(Json(AssociateResponse {
        status: "success".to_string(),
        target: info,
    }))
}

// ── GET /api/target/list ──
pub async fn list_targets(
    State(state): State<Arc<AppState>>,
    Query(params): Query<TargetListParams>,
) -> Result<Json<Vec<TargetInfo>>, (StatusCode, String)> {
    let rows = sqlx::query_as::<_, (String, Option<String>, Option<String>, Option<f64>, Option<String>, Option<f64>, Option<String>)>(
        "SELECT target_name, ra, dec, parallax, spectral_type, v_magnitude, aliases FROM paper_targets WHERE bibcode = ? ORDER BY target_name"
    )
    .bind(&params.bibcode)
    .fetch_all(&state.db)
    .await
    .map_err(|e| {
        tracing::error!("获取文献天体关联列表失败 ({}): {}", params.bibcode, e);
        (StatusCode::INTERNAL_SERVER_ERROR, format!("获取文献天体关联列表失败: {}", e))
    })?;

    let targets: Vec<TargetInfo> = rows
        .into_iter()
        .map(
            |(name, ra, dec, parallax, spectral_type, v_magnitude, aliases_json)| {
                let aliases: Vec<String> = aliases_json
                    .and_then(|s| serde_json::from_str(&s).ok())
                    .unwrap_or_default();
                TargetInfo {
                    target_name: name,
                    ra,
                    dec,
                    parallax,
                    spectral_type,
                    v_magnitude,
                    aliases,
                }
            },
        )
        .collect();

    Ok(Json(targets))
}

// ── POST /api/target/extract ──
#[derive(Deserialize)]
pub struct ExtractTargetsRequest {
    pub bibcode: String,
}

#[derive(Serialize)]
pub struct ExtractTargetsResponse {
    pub targets: Vec<TargetInfo>,
}

pub async fn extract_paper_targets(
    State(state): State<Arc<AppState>>,
    Json(req): Json<ExtractTargetsRequest>,
) -> Result<Json<ExtractTargetsResponse>, (StatusCode, String)> {
    tracing::info!("接收到文献天体提取与识别指令: {}", req.bibcode);

    let (_, _, md_opt, _) = crate::api::helpers::check_paper_paths_in_db(
        &state.db,
        &state.config.library_dir,
        &req.bibcode,
    )
    .await
    .map_err(|e| (StatusCode::NOT_FOUND, format!("获取文献路径失败: {}", e)))?
    .ok_or((StatusCode::NOT_FOUND, "该文献未注册在数据库中".to_string()))?;

    let md_rel = md_opt.ok_or((
        StatusCode::BAD_REQUEST,
        "文献尚未解析为 Markdown，请先执行解析".to_string(),
    ))?;
    let md_abs = state.config.library_dir.join(&md_rel);
    if !md_abs.exists() {
        return Err((
            StatusCode::NOT_FOUND,
            "文献 Markdown 文件未找到，请重新解析".to_string(),
        ));
    }

    let markdown_content = std::fs::read_to_string(&md_abs).map_err(|e| {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            format!("读取 Markdown 文件失败: {}", e),
        )
    })?;

    // 重新识别前先清除该文献已有的天体关联记录，确保陈旧和错误绑定的天体得到重置与刷新
    if let Err(e) = sqlx::query("DELETE FROM paper_targets WHERE bibcode = ?")
        .bind(&req.bibcode)
        .execute(&state.db)
        .await
    {
        tracing::error!("清除文献 {} 的旧天体关联失败: {}", req.bibcode, e);
    }

    let client = reqwest::Client::new();
    let targets = crate::services::target::extract_and_cache_targets(
        &state.db,
        &markdown_content,
        &req.bibcode,
        &client,
    )
    .await;

    Ok(Json(ExtractTargetsResponse { targets }))
}