//! Thin headless adapter around the shared local search engine.

use std::path::PathBuf;

use anyhow::{bail, Context, Result};
use clap::{Parser, Subcommand};
use searchi_core::metrics::{MetricsMode, SearchResponse, TraceCollector};
use searchi_core::{IndexOptions, SearchIndex, SearchOptions};
use searchi_service::HybridSearch;
mod mcp;

#[derive(Debug, Parser)]
#[command(name = "searchi", version, about = "Search your local files offline")]
struct Cli {
    #[command(subcommand)]
    command: Command,
}

#[derive(Debug, Subcommand)]
enum Command {
    /// Serve read-only local agent tools over MCP stdio (no HTTP listener).
    Mcp {
        #[arg(long)]
        db: PathBuf,
        #[arg(long, requires = "embedding_worker")]
        model_dir: Option<PathBuf>,
        #[arg(long, requires = "model_dir")]
        embedding_worker: Option<PathBuf>,
        #[arg(long,default_value_t=1,value_parser=clap::value_parser!(u8).range(1..=8))]
        cpu_threads: u8,
    },
    /// Set up the required Google model in the default local cache.
    Setup {
        /// Set up the local speech recognition models instead of Google embeddings.
        #[arg(long)]
        speech: bool,
        /// Override the platform-local model cache directory.
        #[arg(long)]
        model_dir: Option<PathBuf>,
    },
    /// Discover files and refresh an index for one folder.
    Index {
        /// SQLite index file; parent directory must exist.
        #[arg(long)]
        db: PathBuf,
        /// Folder to index recursively.
        #[arg(long)]
        root: PathBuf,
        /// Additional directory names to exclude; repeat this flag as needed.
        #[arg(long)]
        exclude: Vec<String>,
    },
    /// Search filenames and indexed document content.
    Search {
        #[arg(long)]
        db: PathBuf,
        /// Search text; quote phrases containing spaces in your shell.
        #[arg(default_value = "")]
        query: String,
        /// Maximum number of returned results (1–1000).
        #[arg(long, default_value_t = 20, value_parser = clap::value_parser!(u16).range(1..=1000))]
        limit: u16,
        /// Emit a JSON array for scripting.
        #[arg(long)]
        json: bool,
        /// Include basic measured statistics in JSON output.
        #[arg(long)]
        performance: bool,
        /// Include bounded granular stage timings and diagnostic counters.
        #[arg(long)]
        debug_performance: bool,
        /// Restrict results to this folder and descendants.
        #[arg(long)]
        folder: Option<PathBuf>,
        /// Search indexed source-code files only; supports symbols and semantic code queries.
        #[arg(long)]
        code_only: bool,
        /// File extension, with or without the leading dot.
        #[arg(long)]
        extension: Option<String>,
        /// Exact artist tag; unrelated semantic neighbours cannot bypass it.
        #[arg(long)]
        media_artist: Option<String>,
        /// Exact track/media title tag.
        #[arg(long)]
        media_title: Option<String>,
        #[arg(long)]
        min_size: Option<u64>,
        #[arg(long)]
        max_size: Option<u64>,
        /// Inclusive media duration limit in milliseconds.
        #[arg(long)]
        min_duration_ms: Option<u32>,
        #[arg(long)]
        max_duration_ms: Option<u32>,
        /// Inclusive modification time in Unix milliseconds.
        #[arg(long)]
        modified_after_ms: Option<i64>,
        #[arg(long)]
        modified_before_ms: Option<i64>,
        /// Enable hybrid search with explicitly provisioned local model assets.
        #[arg(long, requires = "embedding_worker")]
        model_dir: Option<PathBuf>,
        /// Local native Google embedding worker, required with --model-dir.
        #[arg(long, requires = "model_dir")]
        embedding_worker: Option<PathBuf>,
        #[arg(long, default_value_t = 1, value_parser = clap::value_parser!(u8).range(1..=8))]
        cpu_threads: u8,
    },
    /// Build a persistent semantic generation from already indexed passages.
    Embed {
        #[arg(long)]
        db: PathBuf,
        #[arg(long)]
        model_dir: PathBuf,
        #[arg(long)]
        embedding_worker: PathBuf,
        #[arg(long, default_value_t = 1, value_parser = clap::value_parser!(u8).range(1..=8))]
        cpu_threads: u8,
        /// Standalone decoder; normally discovered beside the installed CLI.
        #[arg(long, requires = "ffprobe")]
        ffmpeg: Option<PathBuf>,
        #[arg(long, requires = "ffmpeg")]
        ffprobe: Option<PathBuf>,
        /// Explicitly build only document vectors, without media.
        #[arg(long)]
        text_only: bool,
        /// Optional bundled local speech worker; recognizes passages without replacing Google.
        #[arg(long, requires = "speech_model_dir", conflicts_with = "text_only")]
        speech_worker: Option<PathBuf>,
        /// Directory containing verified base and Silero speech models.
        #[arg(long, requires = "speech_worker", conflicts_with = "text_only")]
        speech_model_dir: Option<PathBuf>,
    },
    /// Show the indexed file and content counts.
    Stats {
        #[arg(long)]
        db: PathBuf,
        #[arg(long)]
        json: bool,
    },
}

fn main() -> Result<()> {
    match Cli::parse().command {
        Command::Mcp {
            db,
            model_dir,
            embedding_worker,
            cpu_threads,
        } => {
            require_existing_index(&db)?;
            mcp::serve(db, model_dir, embedding_worker, usize::from(cpu_threads))?;
        }
        Command::Setup { model_dir, speech } => {
            if speech {
                let directory = model_dir
                    .map(Ok)
                    .unwrap_or_else(searchi_assets::speech::default_model_directory)?;
                let progress = std::sync::atomic::AtomicU64::new(0);
                eprintln!("Setting up local speech models; verified cached assets are reused (149 MB maximum download).");
                searchi_assets::speech::provision(&directory, &progress)?;
                println!("Speech models ready: {}", directory.display());
                return Ok(());
            }
            let directory = model_dir
                .map(Ok)
                .unwrap_or_else(searchi_assets::default_model_directory)?;
            let progress = std::sync::atomic::AtomicU64::new(0);
            eprintln!("Setting up Google EmbeddingGemma 2; cached assets are reused (865 MB maximum download).");
            searchi_assets::provision(&directory, &progress)?;
            println!("Google model ready: {}", directory.display());
        }
        Command::Index { db, root, exclude } => {
            let mut options = IndexOptions::default();
            options.excluded_directory_names.extend(exclude);
            let mut index = SearchIndex::open(&db)
                .with_context(|| format!("Cannot open index {}", db.display()))?;
            let report = index
                .index_folder_with_options(&root, &options)
                .with_context(|| format!("Cannot index folder {}", root.display()))?;
            index
                .prewarm()
                .context("Cannot prepare search statistics")?;
            println!(
                "Discovered: {}  Indexed: {}  Unchanged: {}  Removed: {}  Skipped: {}  Extraction failures: {}",
                report.discovered, report.indexed, report.unchanged, report.removed, report.skipped, report.failures
            );
        }
        Command::Search {
            db,
            query,
            limit,
            json,
            performance,
            debug_performance,
            folder,
            code_only,
            extension,
            media_artist,
            media_title,
            min_size,
            max_size,
            min_duration_ms,
            max_duration_ms,
            modified_after_ms,
            modified_before_ms,
            model_dir,
            embedding_worker,
            cpu_threads,
        } => {
            if query.trim().is_empty() && media_artist.is_none() && media_title.is_none() {
                bail!("Supply search text or an exact media artist/title constraint");
            }
            require_existing_index(&db)?;
            let options = SearchOptions {
                folder,
                code_only,
                extension,
                media_artist,
                media_title,
                min_size,
                max_size,
                min_duration_ms,
                max_duration_ms,
                modified_after_unix_ms: modified_after_ms,
                modified_before_unix_ms: modified_before_ms,
            };
            let mut trace = TraceCollector::new(if debug_performance {
                MetricsMode::Debug
            } else {
                MetricsMode::Basic
            });
            let semantic_assets = model_dir
                .zip(embedding_worker)
                .filter(|_| !query.trim().is_empty());
            let results = if let Some((model, runtime)) = semantic_assets {
                let mut service = trace.timed("cli.session_initialize", None, |_, _| {
                    HybridSearch::open_query(&db, model, runtime, usize::from(cpu_threads))
                })?;
                service
                    .search_traced(&query, usize::from(limit), &options, &mut trace, None)
                    .context("Hybrid search failed")?
            } else {
                let index = trace
                    .timed("cli.index_open", None, |_, _| SearchIndex::open(&db))
                    .with_context(|| format!("Cannot open index {}", db.display()))?;
                index
                    .search_with_options_traced(
                        &query,
                        usize::from(limit),
                        &options,
                        &mut trace,
                        None,
                    )
                    .context("Search failed")?
            };
            let response = SearchResponse {
                metrics: trace.finish(results.len()),
                results,
            };
            if json {
                if performance || debug_performance {
                    println!("{}", serde_json::to_string_pretty(&response)?);
                } else {
                    println!("{}", serde_json::to_string_pretty(&response.results)?);
                }
            } else if response.results.is_empty() {
                println!("No matching files.");
            } else {
                for result in &response.results {
                    println!("{} [{}]", result.path, result.match_kind);
                    if let Some(source) = &result.source {
                        println!("  {} {}", source.kind, source.number);
                    }
                    if let Some(error) = &result.extraction_error {
                        println!("  Text extraction unavailable: {error}");
                    }
                    if !result.snippet.is_empty() {
                        println!("  {}", result.snippet.replace(['\r', '\n'], " "));
                    }
                }
            }
            if !json {
                eprintln!(
                    "{} results · {:.2} ms (includes CLI initialization)",
                    response.metrics.result_count, response.metrics.total_ms
                );
                if debug_performance {
                    eprintln!("{}", serde_json::to_string_pretty(&response.metrics)?);
                }
            }
        }
        Command::Embed {
            db,
            model_dir,
            embedding_worker,
            cpu_threads,
            ffmpeg,
            ffprobe,
            text_only,
            speech_worker,
            speech_model_dir,
        } => {
            require_existing_index(&db)?;
            let mut service =
                HybridSearch::open(&db, model_dir, embedding_worker, usize::from(cpu_threads))?;
            if let Some((worker, directory)) = speech_worker.zip(speech_model_dir) {
                let speech = searchi_speech::SpeechWorker::load(
                    &worker,
                    &directory.join("ggml-base.bin"),
                    &directory.join("ggml-silero-v6.2.0.bin"),
                    searchi_speech::Device::Auto,
                )?;
                service = service.with_speech_provider(Box::new(speech))?;
            }
            let report = if text_only {
                service.index_embeddings()
            } else {
                let tools = resolve_media_tools(ffmpeg, ffprobe)?;
                service
                    .index_embeddings_with_media(&tools, &searchi_service::MediaLimits::default())
            }
            .context("Semantic indexing failed; prior generation remains active")?;
            println!("{}", serde_json::to_string_pretty(&report)?);
        }
        Command::Stats { db, json } => {
            require_existing_index(&db)?;
            let index = SearchIndex::open(&db)
                .with_context(|| format!("Cannot open index {}", db.display()))?;
            let stats = index.stats().context("Cannot read index statistics")?;
            if json {
                println!("{}", serde_json::to_string_pretty(&stats)?);
            } else {
                println!(
                    "Files: {}  Files with searchable content: {}",
                    stats.files, stats.content_files
                );
            }
        }
    }
    Ok(())
}

fn resolve_media_tools(
    ffmpeg: Option<PathBuf>,
    ffprobe: Option<PathBuf>,
) -> Result<searchi_service::FfmpegTools> {
    if let (Some(ffmpeg), Some(ffprobe)) = (ffmpeg, ffprobe) {
        return searchi_service::FfmpegTools::new(ffmpeg, ffprobe);
    }
    if let Some(tools) = searchi_service::FfmpegTools::from_environment()? {
        return Ok(tools);
    }
    let development =
        PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../../.searchi/media-runtime/bin");
    let directory = if cfg!(debug_assertions) && development.is_dir() {
        development
    } else {
        std::env::current_exe()?
            .parent()
            .context("CLI installation directory is unavailable")?
            .join("media-runtime/bin")
    };
    searchi_service::FfmpegTools::new(
        directory.join(if cfg!(windows) { "ffmpeg.exe" } else { "ffmpeg" }),
        directory.join(if cfg!(windows) { "ffprobe.exe" } else { "ffprobe" }),
    ).context("Media tools are missing from this installation; repair the headless package or explicitly use --text-only")
}

/// Read commands must not silently create a new empty database after a typo.
fn require_existing_index(db: &std::path::Path) -> Result<()> {
    if !db.is_file() {
        bail!(
            "Index {} does not exist; run `searchi index --db <path> --root <folder>` first",
            db.display()
        );
    }
    Ok(())
}

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

    #[test]
    fn speech_indexing_requires_models_and_cannot_downgrade_to_text_only() {
        let base = [
            "searchi",
            "embed",
            "--db",
            "index.db",
            "--model-dir",
            "google",
            "--embedding-worker",
            "google-worker",
        ];
        assert!(
            Cli::try_parse_from(base.into_iter().chain(["--speech-worker", "speech-worker"]))
                .is_err()
        );
        assert!(Cli::try_parse_from(base.into_iter().chain([
            "--speech-worker",
            "speech-worker",
            "--speech-model-dir",
            "speech",
            "--text-only"
        ]))
        .is_err());
        assert!(Cli::try_parse_from(base.into_iter().chain([
            "--speech-worker",
            "speech-worker",
            "--speech-model-dir",
            "speech"
        ]))
        .is_ok());
        assert!(Cli::try_parse_from(["searchi", "setup", "--speech"]).is_ok());
    }

    #[test]
    fn rejects_zero_or_excessive_result_limits() {
        for limit in ["0", "1001"] {
            assert!(Cli::try_parse_from([
                "searchi", "search", "--db", "index.db", "hello", "--limit", limit
            ])
            .is_err());
        }
    }

    #[test]
    fn requires_complete_semantic_configuration_and_bounded_cpu_budget() {
        assert!(Cli::try_parse_from([
            "searchi",
            "search",
            "--db",
            "index.db",
            "query",
            "--model-dir",
            "models"
        ])
        .is_err());
        assert!(Cli::try_parse_from([
            "searchi",
            "search",
            "--db",
            "index.db",
            "query",
            "--cpu-threads",
            "0"
        ])
        .is_err());
    }

    #[test]
    fn supports_json_search_and_quoted_query() {
        let cli = Cli::try_parse_from([
            "searchi",
            "search",
            "--db",
            "index.db",
            "termination clause",
            "--json",
        ])
        .unwrap();
        assert!(matches!(
            cli.command,
            Command::Search {
                json: true,
                limit: 20,
                ..
            }
        ));
    }
    #[test]
    fn exact_media_cli_filters_match_real_metadata_without_query_or_model() {
        let dir = tempfile::tempdir().unwrap();
        let file = dir.path().join("track.ogg");
        std::fs::write(&file, b"metadata storage fixture").unwrap();
        let mut index = SearchIndex::open(":memory:").unwrap();
        index.index_folder(dir.path()).unwrap();
        let path = file.canonicalize().unwrap().to_string_lossy().into_owned();
        let (bytes, modified) = index.file_signature(&path).unwrap().unwrap();
        let revision = index.media_change_revision(&path, bytes, modified).unwrap();
        let tags = std::collections::BTreeMap::from([
            ("artist".to_owned(), "Björk".to_owned()),
            ("title".to_owned(), "Jóga".to_owned()),
            ("comment".to_owned(), "artist: Other Artist".to_owned()),
        ]);
        index
            .set_structured_media_metadata_at_revision(
                &path, &tags, 1000, bytes, modified, revision,
            )
            .unwrap();
        let cli = Cli::try_parse_from([
            "searchi",
            "search",
            "--db",
            "index.db",
            "--media-artist",
            " BJÖRK ",
            "--media-title",
            "JÓGA",
        ])
        .unwrap();
        let Command::Search {
            query,
            media_artist,
            media_title,
            ..
        } = cli.command
        else {
            panic!("search command");
        };
        assert!(query.is_empty());
        let mut options = SearchOptions {
            media_artist,
            media_title,
            ..Default::default()
        };
        assert_eq!(
            index.search_with_options(&query, 1, &options).unwrap()[0].filename,
            "track.ogg"
        );
        options.media_artist = Some("Other Artist".into());
        assert!(index
            .search_with_options(&query, 1, &options)
            .unwrap()
            .is_empty());
        options.media_artist = Some(" ".into());
        assert!(index.search_with_options(&query, 1, &options).is_err());
    }
}