// synops-audio — FFmpeg lydprosessering via EDL (Edit Decision List).
//
// Input: CAS-hash til kildefil + EDL som JSON-streng.
// Output: JSON med ny CAS-hash til stdout.
// Med --write: oppretter prosessert medienode og derived_from-edge i PG.
//
// Miljøvariabler:
//   DATABASE_URL  — PostgreSQL-tilkobling (påkrevd med --write)
//   CAS_ROOT      — Rot for content-addressable store (default: /srv/synops/media/cas)
//
// Ref: docs/retninger/unix_filosofi.md, docs/features/lydstudio.md

use clap::Parser;
use serde::{Deserialize, Serialize};
use std::path::PathBuf;
use std::process;
use uuid::Uuid;

/// Prosesser lydfil fra CAS via FFmpeg med EDL-operasjoner.
#[derive(Parser)]
#[command(name = "synops-audio", about = "FFmpeg lydprosessering med EDL")]
struct Cli {
    /// SHA-256 CAS-hash til kildefilen
    #[arg(long)]
    cas_hash: String,

    /// EDL (Edit Decision List) som JSON-streng
    #[arg(long)]
    edl: String,

    /// Utdataformat: mp3, wav, flac, ogg
    #[arg(long, default_value = "mp3")]
    output_format: String,

    /// Medienode-ID (original node, påkrevd med --write)
    #[arg(long)]
    node_id: Option<Uuid>,

    /// Bruker-ID som utløste prosesseringen (for ressurslogging)
    #[arg(long)]
    requested_by: Option<Uuid>,

    /// Skriv resultater til database (uten dette flagget: kun stdout)
    #[arg(long)]
    write: bool,
}

// ─── EDL-datastrukturer ───────────────────────────────────────────

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EdlDocument {
    pub source_hash: String,
    pub operations: Vec<EdlOperation>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum EdlOperation {
    Cut {
        start_ms: i64,
        end_ms: i64,
    },
    Normalize {
        target_lufs: f64,
    },
    TrimSilence {
        threshold_db: f32,
        min_duration_ms: u32,
    },
    FadeIn {
        duration_ms: u32,
    },
    FadeOut {
        duration_ms: u32,
    },
    NoiseReduction {
        strength_db: f32,
    },
    Equalizer {
        low_gain: f32,
        mid_gain: f32,
        high_gain: f32,
    },
    Compressor {
        threshold_db: f32,
        ratio: f32,
    },
}

// ─── Hjelpedatastrukturer ─────────────────────────────────────────

#[derive(Debug, Serialize, Deserialize)]
struct LoudnessInfo {
    input_i: f64,
    input_tp: f64,
    input_lra: f64,
    input_thresh: f64,
}

#[derive(Debug, Serialize, Deserialize)]
struct SilenceRegion {
    start_ms: i64,
    end_ms: i64,
}

#[derive(Debug, Serialize, Deserialize)]
struct AudioInfo {
    duration_ms: i64,
}

#[derive(Serialize)]
struct AudioProcessResult {
    cas_hash: String,
    size_bytes: u64,
    output_format: String,
    source_hash: String,
    operations_applied: usize,
    #[serde(skip_serializing_if = "Option::is_none")]
    processed_node_id: Option<String>,
}

// ─── Entrypoint ───────────────────────────────────────────────────

#[tokio::main]
async fn main() {
    synops_common::logging::init("synops_audio");

    let cli = Cli::parse();

    if cli.write && cli.node_id.is_none() {
        eprintln!("Feil: --node-id er påkrevd sammen med --write");
        process::exit(1);
    }

    if let Err(e) = run(cli).await {
        eprintln!("Feil: {e}");
        process::exit(1);
    }
}

async fn run(cli: Cli) -> Result<(), String> {
    let cas_root = synops_common::cas::root();

    // 1. Parse EDL
    let edl: EdlDocument = serde_json::from_str(&cli.edl)
        .map_err(|e| format!("Ugyldig EDL JSON: {e}"))?;

    // Verifiser at source_hash matcher cas_hash
    if edl.source_hash != cli.cas_hash {
        return Err(format!(
            "source_hash i EDL ({}) matcher ikke --cas-hash ({})",
            edl.source_hash, cli.cas_hash
        ));
    }

    // 2. Valider alle parametere
    validate_operations(&edl.operations)?;

    // Valider output-format
    match cli.output_format.as_str() {
        "mp3" | "wav" | "flac" | "ogg" => {}
        other => return Err(format!("Ugyldig output-format: '{other}'. Gyldige: mp3, wav, flac, ogg")),
    }

    // 3. Sjekk at kildefilen finnes i CAS
    let source_path = synops_common::cas::path(&cas_root, &cli.cas_hash);
    if !source_path.exists() {
        return Err(format!("Kildefil finnes ikke i CAS: {}", cli.cas_hash));
    }

    if edl.operations.is_empty() {
        return Err("Ingen operasjoner å utføre".to_string());
    }

    tracing::info!(
        cas_hash = %cli.cas_hash,
        operations = edl.operations.len(),
        output_format = %cli.output_format,
        "Starter lydprosessering"
    );

    // 4. Hent lydvarighet for fade-beregning
    let info = get_audio_info(&source_path).await?;
    validate_fade_durations(&edl.operations, info.duration_ms)?;

    // 5. Resolve trim_silence til cuts via silence detection
    let silence_cuts = resolve_silence_cuts(&cas_root, &edl).await?;

    // 6. To-pass loudnorm hvis normalize er med
    let has_normalize = edl.operations.iter().any(|op| matches!(op, EdlOperation::Normalize { .. }));
    let loudness_measured = if has_normalize {
        // Pass 1: mål loudness etter andre filtre (uten normalize)
        let mut pass1_ops: Vec<EdlOperation> = edl.operations.clone();
        pass1_ops.retain(|op| !matches!(op, EdlOperation::Normalize { .. }));
        pass1_ops.extend(silence_cuts.iter().cloned());

        let pass1_filter = build_filter_chain(&pass1_ops, info.duration_ms, None);

        let measured = if pass1_filter.is_empty() {
            analyze_loudness(&source_path).await?
        } else {
            analyze_with_filter(&source_path, &pass1_filter).await?
        };
        Some(measured)
    } else {
        None
    };

    // 7. Bygg endelig filtergraf
    let mut all_ops = edl.operations.clone();
    all_ops.retain(|op| !matches!(op, EdlOperation::TrimSilence { .. }));
    all_ops.extend(silence_cuts);

    let filter = build_filter_chain(&all_ops, info.duration_ms, loudness_measured.as_ref());

    if filter.is_empty() {
        return Err("Ingen filtre generert fra operasjoner".to_string());
    }

    // 8. Kjør FFmpeg
    let codec_args = match cli.output_format.as_str() {
        "mp3" => vec!["-codec:a", "libmp3lame", "-q:a", "2"],
        "wav" => vec!["-codec:a", "pcm_s16le"],
        "flac" => vec!["-codec:a", "flac"],
        "ogg" => vec!["-codec:a", "libvorbis", "-q:a", "6"],
        _ => vec!["-codec:a", "libmp3lame", "-q:a", "2"],
    };

    let ext = match cli.output_format.as_str() {
        "wav" => "wav",
        "flac" => "flac",
        "ogg" => "ogg",
        _ => "mp3",
    };

    let tmp_dir = PathBuf::from(&cas_root).join("tmp");
    tokio::fs::create_dir_all(&tmp_dir)
        .await
        .map_err(|e| format!("Kunne ikke opprette tmp-katalog: {e}"))?;
    let tmp_output = tmp_dir.join(format!("audio_process_{}.{ext}", Uuid::now_v7()));

    let mut cmd = tokio::process::Command::new("ffmpeg");
    cmd.args(["-i"])
        .arg(&source_path)
        .args(["-af", &filter])
        .args(&codec_args)
        .args(["-y"])
        .arg(&tmp_output);

    tracing::info!(filter = %filter, "Kjører ffmpeg");

    let output = cmd
        .output()
        .await
        .map_err(|e| format!("Kunne ikke kjøre ffmpeg: {e}"))?;

    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        let _ = tokio::fs::remove_file(&tmp_output).await;
        return Err(format!("ffmpeg feilet: {stderr}"));
    }

    // 9. Les resultat, hash det, og lagre i CAS
    let result_bytes = tokio::fs::read(&tmp_output)
        .await
        .map_err(|e| format!("Kunne ikke lese ffmpeg-output: {e}"))?;

    let _ = tokio::fs::remove_file(&tmp_output).await;

    let (result_hash, result_size) = store_in_cas(&cas_root, &result_bytes).await?;

    tracing::info!(
        source = %cli.cas_hash,
        result = %result_hash,
        size = result_size,
        "Lydprosessering fullført"
    );

    // 10. Valgfritt: skriv til database
    let mut processed_node_id = None;

    if cli.write {
        let node_id = cli.node_id.unwrap();
        let requested_by = cli.requested_by
            .ok_or("--requested-by er påkrevd sammen med --write")?;

        let db = synops_common::db::connect().await?;

        let pnode_id = write_to_db(
            &db,
            node_id,
            requested_by,
            &result_hash,
            result_size,
            &cli.output_format,
            &edl,
        )
        .await?;

        processed_node_id = Some(pnode_id.to_string());
        tracing::info!(node_id = %node_id, processed = %pnode_id, "Database oppdatert");
    }

    // 11. Skriv JSON-resultat til stdout
    let result = AudioProcessResult {
        cas_hash: result_hash,
        size_bytes: result_size,
        output_format: cli.output_format,
        source_hash: cli.cas_hash,
        operations_applied: edl.operations.len(),
        processed_node_id,
    };

    println!(
        "{}",
        serde_json::to_string_pretty(&result)
            .map_err(|e| format!("JSON-serialisering feilet: {e}"))?
    );

    Ok(())
}

// ─── Parametervalidering ─────────────────────────────────────────

/// Valider at alle numeriske verdier i EDL-operasjoner er innenfor
/// sikre grenser før de interpoleres i FFmpeg-filterstrenger.
fn validate_operations(ops: &[EdlOperation]) -> Result<(), String> {
    let mut errors: Vec<String> = Vec::new();

    for (i, op) in ops.iter().enumerate() {
        let idx = i + 1;
        match op {
            EdlOperation::Cut { start_ms, end_ms } => {
                if *start_ms < 0 {
                    errors.push(format!("Operasjon {idx} (cut): start_ms ({start_ms}) kan ikke være negativ"));
                }
                if *end_ms < 0 {
                    errors.push(format!("Operasjon {idx} (cut): end_ms ({end_ms}) kan ikke være negativ"));
                }
                if *end_ms <= *start_ms {
                    errors.push(format!("Operasjon {idx} (cut): end_ms ({end_ms}) må være større enn start_ms ({start_ms})"));
                }
            }
            EdlOperation::Normalize { target_lufs } => {
                if target_lufs.is_nan() || target_lufs.is_infinite() {
                    errors.push(format!("Operasjon {idx} (normalize): target_lufs er ikke et gyldig tall"));
                } else if !(-70.0..=0.0).contains(target_lufs) {
                    errors.push(format!("Operasjon {idx} (normalize): target_lufs ({target_lufs}) må være mellom -70.0 og 0.0"));
                }
            }
            EdlOperation::TrimSilence { threshold_db, min_duration_ms } => {
                if threshold_db.is_nan() || threshold_db.is_infinite() {
                    errors.push(format!("Operasjon {idx} (trim_silence): threshold_db er ikke et gyldig tall"));
                } else if !(-96.0..=0.0).contains(threshold_db) {
                    errors.push(format!("Operasjon {idx} (trim_silence): threshold_db ({threshold_db}) må være mellom -96.0 og 0.0"));
                }
                if *min_duration_ms == 0 {
                    errors.push(format!("Operasjon {idx} (trim_silence): min_duration_ms må være større enn 0"));
                }
                if *min_duration_ms > 60_000 {
                    errors.push(format!("Operasjon {idx} (trim_silence): min_duration_ms ({min_duration_ms}) kan ikke overstige 60000 (60 sekunder)"));
                }
            }
            EdlOperation::FadeIn { duration_ms } => {
                if *duration_ms == 0 {
                    errors.push(format!("Operasjon {idx} (fade_in): duration_ms må være større enn 0"));
                }
                if *duration_ms > 300_000 {
                    errors.push(format!("Operasjon {idx} (fade_in): duration_ms ({duration_ms}) kan ikke overstige 300000 (5 minutter)"));
                }
            }
            EdlOperation::FadeOut { duration_ms } => {
                if *duration_ms == 0 {
                    errors.push(format!("Operasjon {idx} (fade_out): duration_ms må være større enn 0"));
                }
                if *duration_ms > 300_000 {
                    errors.push(format!("Operasjon {idx} (fade_out): duration_ms ({duration_ms}) kan ikke overstige 300000 (5 minutter)"));
                }
            }
            EdlOperation::NoiseReduction { strength_db } => {
                if strength_db.is_nan() || strength_db.is_infinite() {
                    errors.push(format!("Operasjon {idx} (noise_reduction): strength_db er ikke et gyldig tall"));
                } else if !(-80.0..=0.0).contains(strength_db) {
                    errors.push(format!("Operasjon {idx} (noise_reduction): strength_db ({strength_db}) må være mellom -80.0 og 0.0"));
                }
            }
            EdlOperation::Equalizer { low_gain, mid_gain, high_gain } => {
                for (name, val) in [("low_gain", low_gain), ("mid_gain", mid_gain), ("high_gain", high_gain)] {
                    if val.is_nan() || val.is_infinite() {
                        errors.push(format!("Operasjon {idx} (equalizer): {name} er ikke et gyldig tall"));
                    } else if !(-30.0..=30.0).contains(val) {
                        errors.push(format!("Operasjon {idx} (equalizer): {name} ({val}) må være mellom -30.0 og 30.0"));
                    }
                }
            }
            EdlOperation::Compressor { threshold_db, ratio } => {
                if threshold_db.is_nan() || threshold_db.is_infinite() {
                    errors.push(format!("Operasjon {idx} (compressor): threshold_db er ikke et gyldig tall"));
                } else if !(-60.0..=0.0).contains(threshold_db) {
                    errors.push(format!("Operasjon {idx} (compressor): threshold_db ({threshold_db}) må være mellom -60.0 og 0.0"));
                }
                if ratio.is_nan() || ratio.is_infinite() {
                    errors.push(format!("Operasjon {idx} (compressor): ratio er ikke et gyldig tall"));
                } else if !(1.0..=20.0).contains(ratio) {
                    errors.push(format!("Operasjon {idx} (compressor): ratio ({ratio}) må være mellom 1.0 og 20.0"));
                }
            }
        }
    }

    if errors.is_empty() {
        Ok(())
    } else {
        Err(format!("Ugyldig EDL:\n- {}", errors.join("\n- ")))
    }
}

/// Valider fade-varigheter mot faktisk lydvarighet.
fn validate_fade_durations(ops: &[EdlOperation], duration_ms: i64) -> Result<(), String> {
    let mut errors: Vec<String> = Vec::new();

    for (i, op) in ops.iter().enumerate() {
        let idx = i + 1;
        match op {
            EdlOperation::FadeIn { duration_ms: fade_ms } => {
                if *fade_ms as i64 > duration_ms {
                    errors.push(format!(
                        "Operasjon {idx} (fade_in): varighet ({fade_ms} ms) \
                         overstiger lydens varighet ({duration_ms} ms)"
                    ));
                }
            }
            EdlOperation::FadeOut { duration_ms: fade_ms } => {
                if *fade_ms as i64 > duration_ms {
                    errors.push(format!(
                        "Operasjon {idx} (fade_out): varighet ({fade_ms} ms) \
                         overstiger lydens varighet ({duration_ms} ms)"
                    ));
                }
            }
            _ => {}
        }
    }

    if errors.is_empty() {
        Ok(())
    } else {
        Err(format!("Ugyldig fade-varighet:\n- {}", errors.join("\n- ")))
    }
}

// ─── FFmpeg-kommandoer ────────────────────────────────────────────

/// Hent lydvarighet via ffprobe.
async fn get_audio_info(path: &PathBuf) -> Result<AudioInfo, String> {
    let output = tokio::process::Command::new("ffprobe")
        .args([
            "-v", "quiet",
            "-print_format", "json",
            "-show_format",
        ])
        .arg(path)
        .output()
        .await
        .map_err(|e| format!("Kunne ikke kjøre ffprobe: {e}"))?;

    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        return Err(format!("ffprobe feilet: {stderr}"));
    }

    let json: serde_json::Value = serde_json::from_slice(&output.stdout)
        .map_err(|e| format!("Kunne ikke parse ffprobe-output: {e}"))?;

    let duration_secs: f64 = json["format"]["duration"]
        .as_str()
        .and_then(|s| s.parse().ok())
        .unwrap_or(0.0);

    Ok(AudioInfo {
        duration_ms: (duration_secs * 1000.0) as i64,
    })
}

/// Analyser loudness (EBU R128) via ffmpeg loudnorm.
async fn analyze_loudness(path: &PathBuf) -> Result<LoudnessInfo, String> {
    let output = tokio::process::Command::new("ffmpeg")
        .args(["-i"])
        .arg(path)
        .args(["-af", "loudnorm=print_format=json", "-f", "null", "-"])
        .output()
        .await
        .map_err(|e| format!("Kunne ikke kjøre ffmpeg loudnorm: {e}"))?;

    let stderr = String::from_utf8_lossy(&output.stderr);
    parse_loudnorm_json(&stderr)
}

/// Kjør loudnorm-analyse med et forhåndsfilter (for to-pass normalisering).
async fn analyze_with_filter(path: &PathBuf, pre_filter: &str) -> Result<LoudnessInfo, String> {
    let filter = format!("{pre_filter},loudnorm=print_format=json");

    let output = tokio::process::Command::new("ffmpeg")
        .args(["-i"])
        .arg(path)
        .args(["-af", &filter, "-f", "null", "-"])
        .output()
        .await
        .map_err(|e| format!("Kunne ikke kjøre ffmpeg loudnorm pass 1: {e}"))?;

    let stderr = String::from_utf8_lossy(&output.stderr);
    parse_loudnorm_json(&stderr)
}

fn parse_loudnorm_json(stderr: &str) -> Result<LoudnessInfo, String> {
    let json_start = stderr
        .find("{\n")
        .ok_or("Fant ikke loudnorm JSON i ffmpeg-output")?;
    let json_end = stderr[json_start..]
        .find("\n}")
        .map(|i| json_start + i + 2)
        .ok_or("Ufullstendig loudnorm JSON")?;

    let json: serde_json::Value = serde_json::from_str(&stderr[json_start..json_end])
        .map_err(|e| format!("Kunne ikke parse loudnorm JSON: {e}"))?;

    let get = |field: &str| -> Result<f64, String> {
        json[field]
            .as_str()
            .and_then(|s| s.parse::<f64>().ok())
            .ok_or_else(|| format!("Mangler felt '{field}' i loudnorm-output"))
    };

    Ok(LoudnessInfo {
        input_i: get("input_i")?,
        input_tp: get("input_tp")?,
        input_lra: get("input_lra")?,
        input_thresh: get("input_thresh")?,
    })
}

/// Detekter stille regioner i en lydfil.
async fn detect_silence(
    path: &PathBuf,
    threshold_db: f32,
    min_duration_ms: u32,
) -> Result<Vec<SilenceRegion>, String> {
    let min_duration_secs = min_duration_ms as f64 / 1000.0;
    let filter = format!("silencedetect=noise={threshold_db}dB:d={min_duration_secs}");

    let output = tokio::process::Command::new("ffmpeg")
        .args(["-i"])
        .arg(path)
        .args(["-af", &filter, "-f", "null", "-"])
        .output()
        .await
        .map_err(|e| format!("Kunne ikke kjøre ffmpeg silencedetect: {e}"))?;

    let stderr = String::from_utf8_lossy(&output.stderr);
    let mut regions = Vec::new();
    let mut current_start: Option<f64> = None;

    for line in stderr.lines() {
        if let Some(pos) = line.find("silence_start: ") {
            let val_str = &line[pos + 15..];
            if let Some(secs) = val_str.split_whitespace().next().and_then(|s| s.parse::<f64>().ok()) {
                current_start = Some(secs);
            }
        }
        if let Some(pos) = line.find("silence_end: ") {
            let val_str = &line[pos + 13..];
            if let Some(end_secs) = val_str.split_whitespace().next().and_then(|s| s.parse::<f64>().ok()) {
                if let Some(start_secs) = current_start.take() {
                    regions.push(SilenceRegion {
                        start_ms: (start_secs * 1000.0) as i64,
                        end_ms: (end_secs * 1000.0) as i64,
                    });
                }
            }
        }
    }

    Ok(regions)
}

/// Konverter TrimSilence-operasjoner til faktiske Cut-operasjoner.
async fn resolve_silence_cuts(
    cas_root: &str,
    edl: &EdlDocument,
) -> Result<Vec<EdlOperation>, String> {
    let mut cuts = Vec::new();
    for op in &edl.operations {
        if let EdlOperation::TrimSilence {
            threshold_db,
            min_duration_ms,
        } = op
        {
            let source_path = synops_common::cas::path(cas_root, &edl.source_hash);
            let regions = detect_silence(&source_path, *threshold_db, *min_duration_ms).await?;
            for region in regions {
                // Behold 200ms stillhet på hver side for naturlig lyd,
                // men aldri mer enn halve regionens varighet
                let region_duration = region.end_ms - region.start_ms;
                let margin_ms = 200i64.min(region_duration / 2);
                let start = region.start_ms + margin_ms;
                let end = region.end_ms - margin_ms;
                if end > start {
                    cuts.push(EdlOperation::Cut {
                        start_ms: start,
                        end_ms: end,
                    });
                }
            }
        }
    }
    Ok(cuts)
}

// ─── EDL → FFmpeg filtergraf ──────────────────────────────────────

/// Bygg ffmpeg-filtergraf fra EDL-operasjoner.
///
/// Operasjonsrekkefølge:
/// 1. Cuts (aselect) — fjerner regioner
/// 2. Noise reduction (afftdn)
/// 3. EQ (equalizer)
/// 4. Compressor (acompressor)
/// 5. Normalize (loudnorm) — alltid nest sist
/// 6. Fades (afade) — aller sist
fn build_filter_chain(
    ops: &[EdlOperation],
    duration_ms: i64,
    loudness_measured: Option<&LoudnessInfo>,
) -> String {
    let mut filters: Vec<String> = Vec::new();

    // Samle alle cuts
    let mut cuts: Vec<(i64, i64)> = Vec::new();
    for op in ops {
        if let EdlOperation::Cut { start_ms, end_ms } = op {
            cuts.push((*start_ms, *end_ms));
        }
    }

    // Sorter cuts og bygg aselect-filter
    if !cuts.is_empty() {
        cuts.sort_by_key(|c| c.0);
        let conditions: Vec<String> = cuts
            .iter()
            .map(|(s, e)| {
                format!(
                    "between(t,{:.3},{:.3})",
                    *s as f64 / 1000.0,
                    *e as f64 / 1000.0
                )
            })
            .collect();
        filters.push(format!(
            "aselect='not({})',asetpts=N/SR/TB",
            conditions.join("+")
        ));
    }

    // Noise reduction
    for op in ops {
        if let EdlOperation::NoiseReduction { strength_db } = op {
            filters.push(format!("afftdn=nf={strength_db}"));
        }
    }

    // EQ — tre-bånds parametrisk
    for op in ops {
        if let EdlOperation::Equalizer { low_gain, mid_gain, high_gain } = op {
            let mut eq_parts = Vec::new();
            if *low_gain != 0.0 {
                eq_parts.push(format!("equalizer=f=100:t=h:w=200:g={low_gain}"));
            }
            if *mid_gain != 0.0 {
                eq_parts.push(format!("equalizer=f=1000:t=h:w=1000:g={mid_gain}"));
            }
            if *high_gain != 0.0 {
                eq_parts.push(format!("equalizer=f=8000:t=h:w=4000:g={high_gain}"));
            }
            filters.extend(eq_parts);
        }
    }

    // Compressor
    for op in ops {
        if let EdlOperation::Compressor { threshold_db, ratio } = op {
            filters.push(format!(
                "acompressor=threshold={threshold_db}dB:ratio={ratio}:attack=5:release=50"
            ));
        }
    }

    // Normalize (loudnorm) — to-pass hvis vi har målte verdier
    for op in ops {
        if let EdlOperation::Normalize { target_lufs } = op {
            if let Some(measured) = loudness_measured {
                filters.push(format!(
                    "loudnorm=I={target_lufs}:TP=-1.5:LRA=11:\
                     measured_I={:.1}:measured_TP={:.1}:measured_LRA={:.1}:\
                     measured_thresh={:.1}:linear=true",
                    measured.input_i,
                    measured.input_tp,
                    measured.input_lra,
                    measured.input_thresh,
                ));
            } else {
                filters.push(format!("loudnorm=I={target_lufs}:TP=-1.5:LRA=11"));
            }
        }
    }

    // Beregn varighet etter cuts for fade-out posisjonering
    let total_cut_ms: i64 = cuts.iter().map(|(s, e)| e - s).sum();
    let effective_duration_ms = duration_ms - total_cut_ms;

    // Fades — helt sist
    for op in ops {
        match op {
            EdlOperation::FadeIn { duration_ms } => {
                let d = *duration_ms as f64 / 1000.0;
                filters.push(format!("afade=t=in:d={d:.3}"));
            }
            EdlOperation::FadeOut { duration_ms: dur } => {
                let d = *dur as f64 / 1000.0;
                let start = ((effective_duration_ms as f64 / 1000.0) - d).max(0.0);
                filters.push(format!("afade=t=out:st={start:.3}:d={d:.3}"));
            }
            _ => {}
        }
    }

    filters.join(",")
}

// ─── CAS-operasjoner ─────────────────────────────────────────────

/// Beregn SHA-256, lagre i CAS med atomisk rename.
async fn store_in_cas(cas_root: &str, data: &[u8]) -> Result<(String, u64), String> {
    let hash = synops_common::cas::hash_bytes(data);

    let dest = synops_common::cas::path(cas_root, &hash);

    // Allerede lagret?
    if dest.exists() {
        return Ok((hash, data.len() as u64));
    }

    // Opprett mappen
    if let Some(parent) = dest.parent() {
        tokio::fs::create_dir_all(parent)
            .await
            .map_err(|e| format!("Kunne ikke opprette CAS-katalog: {e}"))?;
    }

    // Skriv til temp-fil, deretter atomisk rename
    let tmp_path = PathBuf::from(cas_root)
        .join("tmp")
        .join(format!("{}.tmp", hash));
    tokio::fs::write(&tmp_path, data)
        .await
        .map_err(|e| format!("Kunne ikke skrive CAS temp-fil: {e}"))?;
    tokio::fs::rename(&tmp_path, &dest)
        .await
        .map_err(|e| format!("Kunne ikke flytte til CAS: {e}"))?;

    Ok((hash, data.len() as u64))
}

// ─── Database-operasjoner (kun med --write) ───────────────────────

async fn write_to_db(
    db: &sqlx::PgPool,
    media_node_id: Uuid,
    requested_by: Uuid,
    result_hash: &str,
    result_size: u64,
    output_format: &str,
    edl: &EdlDocument,
) -> Result<Uuid, String> {
    let mime = match output_format {
        "mp3" => "audio/mpeg",
        "wav" => "audio/wav",
        "flac" => "audio/flac",
        "ogg" => "audio/ogg",
        _ => "audio/mpeg",
    };

    let processed_node_id = Uuid::now_v7();
    let metadata = serde_json::json!({
        "cas_hash": result_hash,
        "mime": mime,
        "size_bytes": result_size,
        "source_hash": edl.source_hash,
        "edl": edl,
    });

    // Hent tittel fra original node
    let original_title: Option<String> = sqlx::query_scalar(
        "SELECT title FROM nodes WHERE id = $1"
    )
    .bind(media_node_id)
    .fetch_optional(db)
    .await
    .map_err(|e| format!("DB-feil: {e}"))?
    .flatten();

    let title = original_title
        .map(|t| format!("{t} (prosessert)"))
        .unwrap_or_else(|| "Prosessert lyd".to_string());

    // Insert processed media node
    sqlx::query(
        "INSERT INTO nodes (id, node_kind, title, visibility, metadata, created_by)
         VALUES ($1, 'media', $2, 'hidden', $3, $4)",
    )
    .bind(processed_node_id)
    .bind(&title)
    .bind(&metadata)
    .bind(requested_by)
    .execute(db)
    .await
    .map_err(|e| format!("Kunne ikke opprette prosessert node: {e}"))?;

    // Opprett derived_from edge: processed → original
    let edge_id = Uuid::now_v7();
    sqlx::query(
        "INSERT INTO edges (id, source_id, target_id, edge_type, system, created_by)
         VALUES ($1, $2, $3, 'derived_from', true, $4)",
    )
    .bind(edge_id)
    .bind(processed_node_id)
    .bind(media_node_id)
    .bind(requested_by)
    .execute(db)
    .await
    .map_err(|e| format!("Kunne ikke opprette derived_from edge: {e}"))?;

    // Logg ressursforbruk
    let collection_id: Option<Uuid> = sqlx::query_scalar(
        "SELECT e.target_id FROM edges e
         JOIN nodes n ON n.id = e.target_id
         WHERE e.source_id = $1 AND e.edge_type = 'belongs_to' AND n.node_kind = 'collection'
         LIMIT 1",
    )
    .bind(media_node_id)
    .fetch_optional(db)
    .await
    .ok()
    .flatten();

    let detail = serde_json::json!({
        "output_format": output_format,
        "operations": edl.operations.len(),
        "result_size_bytes": result_size,
    });

    if let Err(e) = sqlx::query(
        "INSERT INTO resource_usage_log (target_node_id, triggered_by, collection_id, resource_type, detail)
         VALUES ($1, $2, $3, $4, $5)",
    )
    .bind(media_node_id)
    .bind(requested_by)
    .bind(collection_id)
    .bind("ffmpeg_audio")
    .bind(&detail)
    .execute(db)
    .await
    {
        tracing::warn!(error = %e, "Kunne ikke logge ressursforbruk");
    }

    Ok(processed_node_id)
}

// ─── Tester ──────────────────────────────────────────────────────

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn valid_operations_pass() {
        let ops = vec![
            EdlOperation::Cut { start_ms: 0, end_ms: 1000 },
            EdlOperation::Normalize { target_lufs: -16.0 },
            EdlOperation::TrimSilence { threshold_db: -30.0, min_duration_ms: 500 },
            EdlOperation::FadeIn { duration_ms: 1000 },
            EdlOperation::FadeOut { duration_ms: 2000 },
            EdlOperation::NoiseReduction { strength_db: -25.0 },
            EdlOperation::Equalizer { low_gain: 2.0, mid_gain: 0.0, high_gain: -1.0 },
            EdlOperation::Compressor { threshold_db: -20.0, ratio: 4.0 },
        ];
        assert!(validate_operations(&ops).is_ok());
    }

    #[test]
    fn cut_end_before_start_rejected() {
        let ops = vec![EdlOperation::Cut { start_ms: 5000, end_ms: 3000 }];
        let err = validate_operations(&ops).unwrap_err();
        assert!(err.contains("end_ms"));
    }

    #[test]
    fn cut_negative_start_rejected() {
        let ops = vec![EdlOperation::Cut { start_ms: -100, end_ms: 1000 }];
        let err = validate_operations(&ops).unwrap_err();
        assert!(err.contains("negativ"));
    }

    #[test]
    fn normalize_out_of_range_rejected() {
        let ops = vec![EdlOperation::Normalize { target_lufs: 5.0 }];
        assert!(validate_operations(&ops).is_err());

        let ops = vec![EdlOperation::Normalize { target_lufs: -80.0 }];
        assert!(validate_operations(&ops).is_err());
    }

    #[test]
    fn compressor_ratio_out_of_range_rejected() {
        let ops = vec![EdlOperation::Compressor { threshold_db: -20.0, ratio: 0.5 }];
        let err = validate_operations(&ops).unwrap_err();
        assert!(err.contains("ratio"));

        let ops = vec![EdlOperation::Compressor { threshold_db: -20.0, ratio: 25.0 }];
        assert!(validate_operations(&ops).is_err());
    }

    #[test]
    fn eq_gain_out_of_range_rejected() {
        let ops = vec![EdlOperation::Equalizer { low_gain: 50.0, mid_gain: 0.0, high_gain: 0.0 }];
        let err = validate_operations(&ops).unwrap_err();
        assert!(err.contains("low_gain"));
    }

    #[test]
    fn noise_reduction_out_of_range_rejected() {
        let ops = vec![EdlOperation::NoiseReduction { strength_db: 10.0 }];
        assert!(validate_operations(&ops).is_err());
    }

    #[test]
    fn fade_zero_duration_rejected() {
        let ops = vec![EdlOperation::FadeIn { duration_ms: 0 }];
        assert!(validate_operations(&ops).is_err());
    }

    #[test]
    fn trim_silence_zero_duration_rejected() {
        let ops = vec![EdlOperation::TrimSilence { threshold_db: -30.0, min_duration_ms: 0 }];
        assert!(validate_operations(&ops).is_err());
    }

    #[test]
    fn nan_values_rejected() {
        let ops = vec![EdlOperation::Normalize { target_lufs: f64::NAN }];
        assert!(validate_operations(&ops).is_err());

        let ops = vec![EdlOperation::Compressor { threshold_db: f32::NAN, ratio: 4.0 }];
        assert!(validate_operations(&ops).is_err());
    }

    #[test]
    fn infinity_values_rejected() {
        let ops = vec![EdlOperation::Normalize { target_lufs: f64::INFINITY }];
        assert!(validate_operations(&ops).is_err());

        let ops = vec![EdlOperation::Equalizer { low_gain: f32::INFINITY, mid_gain: 0.0, high_gain: 0.0 }];
        assert!(validate_operations(&ops).is_err());
    }

    #[test]
    fn multiple_errors_collected() {
        let ops = vec![
            EdlOperation::Normalize { target_lufs: 100.0 },
            EdlOperation::Compressor { threshold_db: 50.0, ratio: 0.0 },
        ];
        let err = validate_operations(&ops).unwrap_err();
        assert!(err.contains("normalize"));
        assert!(err.contains("compressor"));
    }

    #[test]
    fn empty_operations_valid() {
        assert!(validate_operations(&[]).is_ok());
    }

    #[test]
    fn filter_chain_cuts() {
        let ops = vec![
            EdlOperation::Cut { start_ms: 5000, end_ms: 8000 },
            EdlOperation::Cut { start_ms: 15000, end_ms: 17000 },
        ];
        let chain = build_filter_chain(&ops, 60000, None);
        assert!(chain.contains("aselect"));
        assert!(chain.contains("between"));
        assert!(chain.contains("asetpts"));
    }

    #[test]
    fn filter_chain_order() {
        let ops = vec![
            EdlOperation::FadeIn { duration_ms: 1000 },
            EdlOperation::NoiseReduction { strength_db: -25.0 },
            EdlOperation::Normalize { target_lufs: -16.0 },
        ];
        let chain = build_filter_chain(&ops, 60000, None);
        let nr_pos = chain.find("afftdn").unwrap();
        let norm_pos = chain.find("loudnorm").unwrap();
        let fade_pos = chain.find("afade").unwrap();
        // noise reduction < normalize < fade
        assert!(nr_pos < norm_pos);
        assert!(norm_pos < fade_pos);
    }

    #[test]
    fn filter_chain_two_pass_loudnorm() {
        let ops = vec![EdlOperation::Normalize { target_lufs: -16.0 }];
        let measured = LoudnessInfo {
            input_i: -24.0,
            input_tp: -1.0,
            input_lra: 7.0,
            input_thresh: -34.0,
        };
        let chain = build_filter_chain(&ops, 60000, Some(&measured));
        assert!(chain.contains("measured_I=-24.0"));
        assert!(chain.contains("linear=true"));
    }

    #[test]
    fn filter_chain_fade_out_positioning() {
        let ops = vec![EdlOperation::FadeOut { duration_ms: 2000 }];
        let chain = build_filter_chain(&ops, 10000, None);
        // 10s - 2s = 8s start
        assert!(chain.contains("st=8.000"));
    }

    #[test]
    fn filter_chain_fade_out_after_cuts() {
        let ops = vec![
            EdlOperation::Cut { start_ms: 2000, end_ms: 5000 },
            EdlOperation::FadeOut { duration_ms: 1000 },
        ];
        // 10s - 3s cut = 7s effective. 7s - 1s fade = 6s start
        let chain = build_filter_chain(&ops, 10000, None);
        assert!(chain.contains("st=6.000"));
    }

    #[test]
    fn cas_path_format() {
        let p = synops_common::cas::path("/srv/synops/media/cas", "b94d27b9934d3e08");
        assert_eq!(
            p,
            PathBuf::from("/srv/synops/media/cas/b9/4d/b94d27b9934d3e08")
        );
    }

    #[test]
    fn edl_json_roundtrip() {
        let edl = EdlDocument {
            source_hash: "abc123".to_string(),
            operations: vec![
                EdlOperation::Cut { start_ms: 0, end_ms: 1000 },
                EdlOperation::Normalize { target_lufs: -16.0 },
            ],
        };
        let json = serde_json::to_string(&edl).unwrap();
        let parsed: EdlDocument = serde_json::from_str(&json).unwrap();
        assert_eq!(parsed.source_hash, "abc123");
        assert_eq!(parsed.operations.len(), 2);
    }

    #[test]
    fn validate_fade_duration_exceeds_audio() {
        let ops = vec![EdlOperation::FadeIn { duration_ms: 5000 }];
        assert!(validate_fade_durations(&ops, 3000).is_err());
        assert!(validate_fade_durations(&ops, 5000).is_ok());
        assert!(validate_fade_durations(&ops, 10000).is_ok());
    }
}