//! Tauri commands that read/write the analysis cache and steer the backfill
//! queue. Thin wrappers around `analysis_cache::*` and `analysis_runtime::*`
//! plus the playback-query port (for "is this track currently playing? /
//! is a ranged playback already going to seed it?").

use std::collections::HashSet;

use tauri::Manager;

use psysonic_core::ports::PlaybackQueryHandle;

use crate::analysis_cache;
use crate::analysis_runtime::{
    analysis_backfill_is_current_track, analysis_backfill_shared, prune_analysis_queues,
    AnalysisBackfillEnqueueKind,
};

#[derive(serde::Serialize)]
#[serde(rename_all = "camelCase")]
pub struct WaveformCachePayload {
    pub bins: Vec<u8>,
    pub bin_count: i64,
    pub is_partial: bool,
    pub known_until_sec: f64,
    pub duration_sec: f64,
    pub updated_at: i64,
}

#[derive(serde::Serialize)]
#[serde(rename_all = "camelCase")]
pub struct LoudnessCachePayload {
    pub integrated_lufs: f64,
    pub true_peak: f64,
    pub recommended_gain_db: f64,
    pub target_lufs: f64,
    pub updated_at: i64,
}

#[tauri::command]
pub fn analysis_get_waveform(
    track_id: String,
    md5_16kb: String,
    cache: tauri::State<'_, analysis_cache::AnalysisCache>,
) -> Result<Option<WaveformCachePayload>, String> {
    let key = analysis_cache::TrackKey {
        track_id: track_id.clone(),
        md5_16kb: md5_16kb.clone(),
    };
    let row = cache.get_waveform(&key)?;
    match &row {
        Some(v) => {
            crate::app_deprintln!(
                "[analysis][waveform] db hit (exact key) track_id={} md5_16kb={} bins_len={} bin_count={} updated_at={}",
                track_id,
                md5_16kb,
                v.bins.len(),
                v.bin_count,
                v.updated_at
            );
        }
        None => {
            crate::app_deprintln!(
                "[analysis][waveform] db miss (exact key) track_id={} md5_16kb={}",
                track_id,
                md5_16kb
            );
        }
    }
    Ok(row.map(|v| WaveformCachePayload {
        bins: v.bins,
        bin_count: v.bin_count,
        is_partial: v.is_partial,
        known_until_sec: v.known_until_sec,
        duration_sec: v.duration_sec,
        updated_at: v.updated_at,
    }))
}

#[tauri::command]
pub fn analysis_get_waveform_for_track(
    track_id: String,
    cache: tauri::State<'_, analysis_cache::AnalysisCache>,
) -> Result<Option<WaveformCachePayload>, String> {
    let row = cache.get_latest_waveform_for_track(&track_id)?;
    match &row {
        Some(v) => {
            crate::app_deprintln!(
                "[analysis][waveform] db hit track_id={} bins_len={} bin_count={} updated_at={}",
                track_id,
                v.bins.len(),
                v.bin_count,
                v.updated_at
            );
        }
        None => {
            crate::app_deprintln!(
                "[analysis][waveform] db miss track_id={}",
                track_id
            );
        }
    }
    Ok(row.map(|v| WaveformCachePayload {
        bins: v.bins,
        bin_count: v.bin_count,
        is_partial: v.is_partial,
        known_until_sec: v.known_until_sec,
        duration_sec: v.duration_sec,
        updated_at: v.updated_at,
    }))
}

#[tauri::command]
pub fn analysis_get_loudness_for_track(
    track_id: String,
    target_lufs: Option<f64>,
    cache: tauri::State<'_, analysis_cache::AnalysisCache>,
) -> Result<Option<LoudnessCachePayload>, String> {
    let row = cache.get_latest_loudness_for_track(&track_id)?;
    Ok(row.map(|v| {
        let requested_target = target_lufs.unwrap_or(v.target_lufs).clamp(-30.0, -8.0);
        let recommended_gain_db = analysis_cache::recommended_gain_for_target(
            v.integrated_lufs,
            v.true_peak,
            requested_target,
        );
        LoudnessCachePayload {
            integrated_lufs: v.integrated_lufs,
            true_peak: v.true_peak,
            recommended_gain_db,
            target_lufs: requested_target,
            updated_at: v.updated_at,
        }
    }))
}

#[tauri::command]
pub fn analysis_delete_loudness_for_track(
    track_id: String,
    cache: tauri::State<'_, analysis_cache::AnalysisCache>,
) -> Result<u64, String> {
    cache.delete_loudness_for_track_id(&track_id)
}

#[tauri::command]
pub fn analysis_delete_all_waveforms(
    cache: tauri::State<'_, analysis_cache::AnalysisCache>,
) -> Result<u64, String> {
    cache.delete_all_waveforms()
}

#[tauri::command]
pub fn analysis_enqueue_seed_from_url(
    track_id: String,
    url: String,
    force: Option<bool>,
    app: tauri::AppHandle,
) -> Result<(), String> {
    if track_id.trim().is_empty() || url.trim().is_empty() {
        return Ok(());
    }
    let force = force.unwrap_or(false);
    if !force {
        if let Some(playback) = app.try_state::<PlaybackQueryHandle>() {
            if playback.ranged_loudness_backfill_should_defer(&track_id) {
                crate::app_deprintln!(
                    "[analysis] backfill skip track_id={} reason=ranged_playback_will_seed",
                    track_id
                );
                return Ok(());
            }
        }
    }
    if !force {
        if let Some(cache) = app.try_state::<analysis_cache::AnalysisCache>() {
            if cache.get_latest_loudness_for_track(&track_id)?.is_some() {
                crate::app_deprintln!(
                    "[analysis] backfill skip (already cached): {}",
                    track_id
                );
                return Ok(());
            }
        }
    }
    let tid_log = track_id.clone();
    let high_priority = analysis_backfill_is_current_track(&app, &track_id);
    let shared = analysis_backfill_shared(&app);
    let kind = {
        let mut st = shared
            .state
            .lock()
            .map_err(|_| "analysis backfill lock poisoned".to_string())?;
        st.enqueue(track_id, url, high_priority)
    };
    match kind {
        AnalysisBackfillEnqueueKind::NewBack | AnalysisBackfillEnqueueKind::NewFront => {
            shared.ping_worker();
            crate::app_deprintln!(
                "[analysis] backfill enqueued: track_id={} position={}",
                tid_log,
                if high_priority { "front" } else { "back" }
            );
        }
        AnalysisBackfillEnqueueKind::ReorderedFront => {
            shared.ping_worker();
            crate::app_deprintln!(
                "[analysis] backfill bumped to front (current track) track_id={}",
                tid_log
            );
        }
        AnalysisBackfillEnqueueKind::DuplicateSkipped | AnalysisBackfillEnqueueKind::RunningSkipped => {}
    }
    Ok(())
}

#[derive(Debug, Clone, serde::Serialize)]
#[serde(rename_all = "camelCase")]
pub struct AnalysisPrunePendingResult {
    pub keep_count: usize,
    pub http_removed: usize,
    pub cpu_removed_jobs: usize,
    pub cpu_removed_waiters: usize,
}

/// Prunes pending analysis work for tracks no longer present in the playback queue.
///
/// Keeps currently-running jobs untouched; only queued (not-yet-started) jobs are removed.
#[tauri::command]
pub fn analysis_prune_pending_to_track_ids(
    track_ids: Vec<String>,
) -> Result<AnalysisPrunePendingResult, String> {
    let mut normalized: Vec<String> = Vec::with_capacity(track_ids.len());
    let mut seen = HashSet::new();
    for raw in track_ids {
        let tid = raw.trim();
        if tid.is_empty() {
            continue;
        }
        if seen.insert(tid.to_string()) {
            normalized.push(tid.to_string());
        }
    }
    let keep_track_ids: HashSet<&str> = normalized.iter().map(|s| s.as_str()).collect();

    let (http_removed, cpu_removed_jobs, cpu_removed_waiters) =
        prune_analysis_queues(&keep_track_ids)?;

    if http_removed > 0 || cpu_removed_jobs > 0 {
        crate::app_deprintln!(
            "[analysis] pruned pending queues keep={} removed_http={} removed_cpu_jobs={} removed_cpu_waiters={}",
            keep_track_ids.len(),
            http_removed,
            cpu_removed_jobs,
            cpu_removed_waiters
        );
    }

    Ok(AnalysisPrunePendingResult {
        keep_count: keep_track_ids.len(),
        http_removed,
        cpu_removed_jobs,
        cpu_removed_waiters,
    })
}