use crate::{path_or_stdin, BatchGrouper, BatchOp};
use anyhow::{anyhow, Context, Result};
use colored_json::to_colored_json_auto;
use fatcat_cli::*;
#[allow(unused_imports)]
use log::{self, debug, info};
use std::io::Write;
use std::path::PathBuf;
use structopt::StructOpt;
use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};

#[derive(StructOpt)]
#[structopt(rename_all = "kebab-case", about = "CLI interface to Fatcat API")]
struct Opt {
    #[structopt(
        global = true,
        long = "--api-host",
        env = "FATCAT_API_HOST",
        default_value = "https://api.fatcat.wiki"
    )]
    api_host: String,

    // API auth tokens can be generated from the account page in the fatcat.wiki web interface
    #[structopt(
        global = true,
        long = "--api-token",
        env = "FATCAT_API_AUTH_TOKEN",
        hide_env_values = true
    )]
    api_token: Option<String>,

    #[structopt(
        global = true,
        long = "--search-host",
        env = "FATCAT_SEARCH_HOST",
        default_value = "https://search.fatcat.wiki"
    )]
    search_host: String,

    /// Log more messages. Pass multiple times for ever more verbosity
    ///
    /// By default, it'll only report errors. Passing `-v` one time also prints
    /// warnings, `-vv` enables info logging, `-vvv` debug, and `-vvvv` trace.
    #[structopt(global = true, long, short = "v", parse(from_occurrences))]
    verbose: i8,

    #[structopt(long = "--shell-completions", hidden = true)]
    shell_completions: Option<structopt::clap::Shell>,

    #[structopt(long = "--meow", hidden = true)]
    meow: bool,

    #[structopt(subcommand)]
    cmd: Command,
}

#[derive(StructOpt)]
enum EditgroupsCommand {
    /// Create a new editgroup
    Create {
        #[structopt(long, short)]
        description: String,
    },
    /// Print editgroups for current user
    List {
        #[structopt(long = "--editor-id", short)]
        editor_id: Option<String>,

        #[structopt(long, short = "-n", default_value = "20")]
        limit: i64,

        #[structopt(long)]
        json: bool,
    },
    /// Print recent editgroups from any user which need review
    Reviewable {
        #[structopt(long, short = "-n", default_value = "20")]
        limit: i64,

        #[structopt(long)]
        json: bool,
    },
    /// Accept (merge) a single editgroup
    Accept {
        #[structopt(env = "FATCAT_EDITGROUP", hide_env_values = true)]
        editgroup_id: EditgroupSpecifier,
    },
    /// Submit a single editgroup for review
    Submit {
        #[structopt(env = "FATCAT_EDITGROUP", hide_env_values = true)]
        editgroup_id: EditgroupSpecifier,
    },
    /// Un-submit a single editgroup (for more editing)
    Unsubmit {
        #[structopt(env = "FATCAT_EDITGROUP", hide_env_values = true)]
        editgroup_id: EditgroupSpecifier,
    },
}

#[derive(StructOpt)]
enum BatchCommand {
    /// Create new entities in batches
    Create {
        entity_type: EntityType,

        #[structopt(long, default_value = "50", global = true)]
        batch_size: u64,

        #[structopt(long, global = true)]
        auto_accept: bool,

        /// Editgroup description
        #[structopt(long, short)]
        description: Option<String>,
    },

    /// Update existing entities in batches
    Update {
        entity_type: EntityType,
        mutations: Vec<Mutation>,

        #[structopt(long, default_value = "50")]
        batch_size: u64,

        #[structopt(long)]
        auto_accept: bool,

        /// Editgroup description
        #[structopt(long, short)]
        description: Option<String>,
    },

    /// Delete entities in batches
    Delete {
        entity_type: EntityType,

        #[structopt(long, default_value = "50")]
        batch_size: u64,

        #[structopt(long)]
        auto_accept: bool,

        /// Editgroup description
        #[structopt(long, short)]
        description: Option<String>,
    },

    /// Download multiple files
    Download {
        #[structopt(long, short = "-o", parse(from_os_str))]
        output_dir: Option<PathBuf>,

        #[structopt(long, short = "-j", default_value = "1")]
        jobs: u64,
    },
}

#[derive(StructOpt)]
enum Command {
    /// Fetch a single entity, by "ident" or external identifier
    Get {
        specifier: Specifier,

        #[structopt(long = "--expand")]
        expand: Option<String>,

        #[structopt(long = "--hide")]
        hide: Option<String>,

        #[allow(dead_code)]
        #[structopt(long)]
        json: bool,

        #[structopt(long)]
        toml: bool,
    },

    /// Create a single new entity, from a file, in an existing editgroup
    Create {
        entity_type: EntityType,

        /// Input file, "-" for stdin.
        #[structopt(long = "--input-file", short = "-i", parse(from_os_str))]
        input_path: Option<PathBuf>,

        #[structopt(
            long = "--editgroup-id",
            short,
            env = "FATCAT_EDITGROUP",
            hide_env_values = true
        )]
        editgroup_id: EditgroupSpecifier,
    },

    /// Update an existing editgroup, either from file or updating specified fields
    Update {
        specifier: Specifier,

        /// Input file, "-" for stdin.
        #[structopt(long = "--input-file", short = "-i", parse(from_os_str))]
        input_path: Option<PathBuf>,

        #[structopt(
            long = "--editgroup-id",
            short,
            env = "FATCAT_EDITGROUP",
            hide_env_values = true
        )]
        editgroup_id: EditgroupSpecifier,

        mutations: Vec<Mutation>,
    },

    /// Delete a single entity
    Delete {
        specifier: Specifier,

        #[structopt(
            long = "--editgroup-id",
            short,
            env = "FATCAT_EDITGROUP",
            hide_env_values = true
        )]
        editgroup_id: EditgroupSpecifier,
    },

    /// Use a text editor to update entity; fetches and uploads automatically
    Edit {
        specifier: Specifier,

        #[structopt(
            long = "--editgroup-id",
            short,
            env = "FATCAT_EDITGROUP",
            hide_env_values = true
        )]
        editgroup_id: EditgroupSpecifier,

        #[structopt(long)]
        json: bool,

        #[allow(dead_code)]
        #[structopt(long)]
        toml: bool,

        #[structopt(long = "--editing-command", env = "EDITOR")]
        editing_command: String,
    },

    /// Fetch full-text file corresponding to an entity
    Download {
        specifier: Specifier,

        #[structopt(long = "--output-dir", short = "-o", parse(from_os_str))]
        output_path: Option<PathBuf>,
    },

    /// List edit history for a single entity
    History {
        specifier: Specifier,

        #[structopt(long, short = "-n", default_value = "100")]
        limit: u64,

        #[structopt(long)]
        json: bool,
    },

    /// Query catalog index
    Search {
        entity_type: SearchEntityType,

        query: Vec<String>,

        #[structopt(long = "--expand")]
        expand: Option<String>,

        #[structopt(long = "--hide")]
        hide: Option<String>,

        #[structopt(long = "--count")]
        count: bool,

        #[structopt(long, short = "-n", default_value = "20")]
        limit: i64,

        #[structopt(long = "--entity-json")]
        entity_json: bool,

        #[structopt(long = "--index-json")]
        index_json: bool,
    },

    /// Sub-commands for managing editgroups
    Editgroups {
        #[structopt(subcommand)]
        cmd: EditgroupsCommand,
    },

    /// List recent accepted edits to the catalog
    Changelog {
        #[structopt(long, short = "-n", default_value = "20")]
        limit: i64,

        /* TODO: follow (streaming) mode for changelog
        #[structopt(long, short = "-f")]
        follow: bool,
        */
        #[structopt(long)]
        json: bool,
    },

    /// Operations on multiple entities
    Batch {
        #[structopt(subcommand)]
        cmd: BatchCommand,

        /// Input file, "-" for stdin.
        #[structopt(long = "--input-file", short = "-i", parse(from_os_str))]
        input_path: Option<PathBuf>,

        #[structopt(long, short = "-n")]
        limit: Option<u64>,
    },

    /// Summarize connection and authentication with API
    Status {
        #[structopt(long)]
        json: bool,
    },
}

fn main() -> Result<()> {
    let opt = Opt::from_args();

    let log_level = match opt.verbose {
        std::i8::MIN..=-1 => "none",
        0 => "error",
        1 => "warn",
        2 => "info",
        3 => "debug",
        4..=std::i8::MAX => "trace",
    };
    // hyper logging is very verbose, so crank that down even if everything else is more verbose
    let log_filter = format!("{},hyper=error", log_level);
    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or(log_filter))
        .format_timestamp(None)
        .init();

    debug!("Args parsed, starting up");

    #[cfg(windows)]
    colored_json::enable_ansi_support();

    if let Some(shell) = opt.shell_completions {
        Opt::clap().gen_completions_to("fatcat-cli", shell, &mut std::io::stdout());
        std::process::exit(0);
    }
    if opt.meow {
        println!("meow meow");
        std::process::exit(0);
    }

    if let Err(err) = run(opt) {
        // Be graceful about some errors
        if let Some(io_err) = err.root_cause().downcast_ref::<std::io::Error>() {
            if let std::io::ErrorKind::BrokenPipe = io_err.kind() {
                // presumably due to something like writing to stdout and piped to `head -n10` and
                // stdout was closed
                debug!("got BrokenPipe error, assuming stdout closed as expected and exiting with success");
                std::process::exit(0);
            }
        }
        let mut color_stderr = StandardStream::stderr(if atty::is(atty::Stream::Stderr) {
            ColorChoice::Auto
        } else {
            ColorChoice::Never
        });
        color_stderr.set_color(ColorSpec::new().set_fg(Some(Color::Red)).set_bold(true))?;
        eprintln!("Error: {:?}", err);
        color_stderr.set_color(&ColorSpec::new())?;
        std::process::exit(1);
    }
    Ok(())
}

fn run(opt: Opt) -> Result<()> {
    let mut api_client = FatcatApiClient::new(opt.api_host.clone(), opt.api_token.clone())?;

    match opt.cmd {
        Command::Get {
            specifier,
            expand,
            hide,
            json: _,
            toml,
        } => {
            let result = specifier.get_from_api(&mut api_client, expand, hide)?;
            if toml {
                writeln!(&mut std::io::stdout(), "{}", result.to_toml_string()?)?
            } else {
                // "if json"
                writeln!(
                    &mut std::io::stdout(),
                    "{}",
                    to_colored_json_auto(&result.to_json_value()?)?
                )?
            }
        }
        Command::Create {
            entity_type,
            input_path,
            editgroup_id,
        } => {
            let json_str = read_entity_file(input_path)?;
            let ee = api_client.create_entity_from_json(
                entity_type,
                &json_str,
                editgroup_id.into_string(),
            )?;
            writeln!(
                &mut std::io::stdout(),
                "{}",
                to_colored_json_auto(&serde_json::to_value(&ee)?)?
            )?
        }
        Command::Update {
            specifier,
            input_path,
            editgroup_id,
            mutations,
        } => {
            let (json_str, exact_specifier): (String, Specifier) =
                match (&input_path, mutations.len()) {
                    // input path or no mutations: read from path or stdin
                    (Some(_), _) | (None, 0) => (
                        read_entity_file(input_path)?,
                        specifier.into_entity_specifier(&mut api_client)?,
                    ),
                    // no input path *and* mutations: fetch from API
                    (None, _) => {
                        let mut entity = specifier.get_from_api(&mut api_client, None, None)?;
                        entity.mutate(mutations)?;
                        (entity.to_json_string()?, entity.specifier())
                    }
                };
            let ee = api_client.update_entity_from_json(
                exact_specifier,
                &json_str,
                editgroup_id.into_string(),
            )?;
            writeln!(
                &mut std::io::stdout(),
                "{}",
                to_colored_json_auto(&serde_json::to_value(&ee)?)?
            )?
        }
        Command::Edit {
            specifier,
            editgroup_id,
            json,
            toml: _,
            editing_command,
        } => {
            let ee = edit_entity_locally(
                &mut api_client,
                specifier,
                editgroup_id.into_string(),
                json,
                editing_command,
            )?;
            writeln!(
                &mut std::io::stdout(),
                "{}",
                to_colored_json_auto(&serde_json::to_value(&ee)?)?
            )?
        }
        Command::Changelog { limit, json } => {
            let resp = api_client
                .rt
                .block_on(api_client.api.get_changelog(Some(limit)))
                .context("fetch recent changelogs")?;
            match resp {
                fatcat_openapi::GetChangelogResponse::Success(change_list) => {
                    print_changelog_entries(change_list, json)?;
                }
                other => {
                    return Err(anyhow!("{:?}", other))
                        .with_context(|| "failed to fetch changelogs".to_string())
                }
            }
        }
        Command::Batch {
            cmd:
                BatchCommand::Create {
                    entity_type,
                    batch_size,
                    auto_accept,
                    description,
                },
            input_path,
            limit,
        } => {
            let input_path = path_or_stdin(input_path);
            let mut batch =
                BatchGrouper::new(entity_type, batch_size, limit, auto_accept, description);
            batch.run(&mut api_client, input_path, BatchOp::Create, None)?;
        }
        Command::Batch {
            cmd:
                BatchCommand::Update {
                    entity_type,
                    mutations,
                    batch_size,
                    auto_accept,
                    description,
                },
            input_path,
            limit,
        } => {
            let input_path = path_or_stdin(input_path);
            let mut batch =
                BatchGrouper::new(entity_type, batch_size, limit, auto_accept, description);
            batch.run(
                &mut api_client,
                input_path,
                BatchOp::Update,
                Some(mutations),
            )?;
        }
        Command::Batch {
            cmd:
                BatchCommand::Delete {
                    entity_type,
                    batch_size,
                    auto_accept,
                    description,
                },
            input_path,
            limit,
        } => {
            let input_path = path_or_stdin(input_path);
            let mut batch =
                BatchGrouper::new(entity_type, batch_size, limit, auto_accept, description);
            batch.run(&mut api_client, input_path, BatchOp::Delete, None)?;
        }
        Command::Batch {
            cmd: BatchCommand::Download { jobs, output_dir },
            input_path,
            limit,
        } => {
            let input_path = path_or_stdin(input_path);
            if let Some(ref dir) = output_dir {
                if !dir.is_dir() {
                    return Err(anyhow!("output directory doesn't exist"));
                }
            }
            if jobs == 0 {
                return Err(anyhow!("--jobs=0 not implemented"));
            }
            if jobs > 12 {
                return Err(anyhow!(
                    "please don't download more than 12 parallel requests"
                ));
            }
            download_batch(input_path, output_dir, limit, jobs)?;
        }
        Command::Download {
            specifier,
            output_path,
        } => {
            // run lookups if necessary (inefficient)
            let specifier = match specifier {
                Specifier::ReleaseLookup(_, _) | Specifier::FileLookup(_, _) => {
                    specifier.into_entity_specifier(&mut api_client)?
                }
                _ => specifier,
            };
            if let Some(ref path) = output_path {
                if path.exists() {
                    return Err(anyhow!("refusing to over-write output file"));
                }
            }
            let status = match specifier {
                Specifier::Release(ident) => {
                    let result = api_client.rt.block_on(api_client.api.get_release(
                        ident.clone(),
                        Some("files".to_string()),
                        Some("abstracts,refs".to_string()),
                    ))?;
                    let release_entity = match result {
                        fatcat_openapi::GetReleaseResponse::FoundEntity(model) => Ok(model),
                        resp => Err(anyhow!("{:?}", resp))
                            .with_context(|| format!("API GET failed: {:?}", ident)),
                    }?;
                    download_release(&release_entity, output_path, true)
                }
                Specifier::File(ident) => {
                    let result = api_client.rt.block_on(api_client.api.get_file(
                        ident.clone(),
                        None,
                        None,
                    ))?;
                    let file_entity = match result {
                        fatcat_openapi::GetFileResponse::FoundEntity(model) => Ok(model),
                        resp => Err(anyhow!("{:?}", resp))
                            .with_context(|| format!("API GET failed: {:?}", ident)),
                    }?;
                    download_file(&file_entity, &file_entity.specifier(), output_path, true)
                }
                other => Err(anyhow!("Don't know how to download: {:?}", other)),
            }?;
            if let Some(detail) = status.details() {
                println!("{}: {}", status, detail);
            } else {
                println!("{}", status);
            }
        }
        Command::Search {
            entity_type,
            query,
            limit,
            count,
            entity_json,
            index_json,
            expand,
            hide,
        } => {
            let limit: Option<u64> = match (count, limit) {
                (true, _) => Some(0),
                (false, l) if l <= 0 => None,
                (false, l) => Some(l as u64),
            };
            let results = fatcat_cli::crude_search(&opt.search_host, entity_type, limit, query)
                .with_context(|| format!("searching for {:?}", entity_type))?;
            if count {
                println!("{}", results.count);
            } else {
                eprintln!("Got {} hits in {}ms", results.count, results.took_ms);
                if !(index_json || entity_json) {
                    print_search_table(results, entity_type)?;
                } else {
                    for hit in results {
                        let hit = hit?;
                        match (index_json, entity_json, entity_type) {
                            (false, false, _) => unreachable!("case handled above"),
                            (true, _, _) => writeln!(&mut std::io::stdout(), "{}", hit)?,
                            (false, true, SearchEntityType::Release) => {
                                let specifier =
                                    Specifier::Release(hit["ident"].as_str().unwrap().to_string());
                                let entity = specifier.get_from_api(
                                    &mut api_client,
                                    expand.clone(),
                                    hide.clone(),
                                )?;
                                writeln!(&mut std::io::stdout(), "{}", entity.to_json_string()?)?
                            }
                            (false, true, SearchEntityType::Container) => {
                                let specifier = Specifier::Container(
                                    hit["ident"].as_str().unwrap().to_string(),
                                );
                                let entity = specifier.get_from_api(
                                    &mut api_client,
                                    expand.clone(),
                                    hide.clone(),
                                )?;
                                writeln!(&mut std::io::stdout(), "{}", entity.to_json_string()?)?
                            }
                            (false, true, SearchEntityType::File) => {
                                let specifier =
                                    Specifier::File(hit["ident"].as_str().unwrap().to_string());
                                let entity = specifier.get_from_api(
                                    &mut api_client,
                                    expand.clone(),
                                    hide.clone(),
                                )?;
                                writeln!(&mut std::io::stdout(), "{}", entity.to_json_string()?)?
                            }
                            (false, true, SearchEntityType::Scholar) => {
                                if !hit["biblio"]["release_ident"].is_string() {
                                    continue;
                                }
                                let specifier = Specifier::Release(
                                    hit["biblio"]["release_ident"].as_str().unwrap().to_string(),
                                );
                                let entity = specifier.get_from_api(
                                    &mut api_client,
                                    expand.clone(),
                                    hide.clone(),
                                )?;
                                writeln!(&mut std::io::stdout(), "{}", entity.to_json_string()?)?
                            }
                            (false, true, SearchEntityType::Reference) => {
                                return Err(anyhow!(
                                    "entity schema output not supported for references index"
                                ));
                            }
                            (false, true, SearchEntityType::ReferenceIn) => {
                                if !hit["source_release_ident"].is_string() {
                                    continue;
                                }
                                let specifier = Specifier::Release(
                                    hit["source_release_ident"].as_str().unwrap().to_string(),
                                );
                                let entity = specifier.get_from_api(
                                    &mut api_client,
                                    expand.clone(),
                                    hide.clone(),
                                )?;
                                writeln!(&mut std::io::stdout(), "{}", entity.to_json_string()?)?
                            }
                            (false, true, SearchEntityType::ReferenceOut) => {
                                if !hit["target_release_ident"].is_string() {
                                    continue;
                                }
                                let specifier = Specifier::Release(
                                    hit["target_release_ident"].as_str().unwrap().to_string(),
                                );
                                let entity = specifier.get_from_api(
                                    &mut api_client,
                                    expand.clone(),
                                    hide.clone(),
                                )?;
                                writeln!(&mut std::io::stdout(), "{}", entity.to_json_string()?)?
                            }
                        }
                    }
                }
            }
        }
        Command::Delete {
            specifier,
            editgroup_id,
        } => {
            let result = api_client
                .delete_entity(specifier.clone(), editgroup_id.into_string())
                .with_context(|| format!("delete entity: {:?}", specifier))?;
            println!("{}", serde_json::to_string(&result)?);
        }
        Command::History {
            specifier,
            limit,
            json,
        } => {
            let specifier = specifier.into_entity_specifier(&mut api_client)?;
            let history_entries = specifier.get_history(&mut api_client, Some(limit))?;
            print_entity_histories(history_entries, json)?;
        }
        Command::Editgroups {
            cmd:
                EditgroupsCommand::List {
                    editor_id,
                    limit,
                    json,
                },
        } => {
            let editor_id = match editor_id.or(api_client.editor_id) {
                Some(eid) => eid,
                None => return Err(anyhow!("require either working auth token or --editor-id")),
            };
            let result = api_client
                .rt
                .block_on(api_client.api.get_editor_editgroups(
                    editor_id.clone(),
                    Some(limit),
                    None,
                    None,
                ))
                .context("fetch editgroups")?;
            match result {
                fatcat_openapi::GetEditorEditgroupsResponse::Found(eg_list) => {
                    print_editgroups(eg_list, json)?;
                }
                other => {
                    return Err(anyhow!("{:?}", other)).with_context(|| {
                        format!("failed to fetch editgroups for editor_{}", editor_id)
                    })
                }
            }
        }
        Command::Editgroups {
            cmd: EditgroupsCommand::Reviewable { limit, json },
        } => {
            let result = api_client
                .rt
                .block_on(api_client.api.get_editgroups_reviewable(
                    Some("editors".to_string()),
                    Some(limit),
                    None,
                    None,
                ))
                .context("fetch reviewable editgroups")?;
            match result {
                fatcat_openapi::GetEditgroupsReviewableResponse::Found(eg_list) => {
                    print_editgroups(eg_list, json)?;
                }
                other => {
                    return Err(anyhow!("{:?}", other))
                        .context("failed to fetch reviewable editgroups")
                }
            }
        }
        Command::Editgroups {
            cmd: EditgroupsCommand::Create { description },
        } => {
            let eg = api_client.create_editgroup(Some(description))?;
            writeln!(
                &mut std::io::stdout(),
                "{}",
                to_colored_json_auto(&serde_json::to_value(&eg)?)?
            )?
        }
        Command::Editgroups {
            cmd: EditgroupsCommand::Accept { editgroup_id },
        } => {
            let msg = api_client.accept_editgroup(editgroup_id.into_string())?;
            writeln!(
                &mut std::io::stdout(),
                "{}",
                to_colored_json_auto(&serde_json::to_value(&msg)?)?
            )?
        }
        Command::Editgroups {
            cmd: EditgroupsCommand::Submit { editgroup_id },
        } => {
            let msg = api_client.update_editgroup_submit(editgroup_id.into_string(), true)?;
            writeln!(
                &mut std::io::stdout(),
                "{}",
                to_colored_json_auto(&serde_json::to_value(&msg)?)?
            )?
        }
        Command::Editgroups {
            cmd: EditgroupsCommand::Unsubmit { editgroup_id },
        } => {
            let msg = api_client.update_editgroup_submit(editgroup_id.into_string(), false)?;
            writeln!(
                &mut std::io::stdout(),
                "{}",
                to_colored_json_auto(&serde_json::to_value(&msg)?)?
            )?
        }
        Command::Status { json } => {
            let status = ClientStatus::generate(&mut api_client)?;
            if json {
                println!("{}", serde_json::to_string(&status)?)
            } else {
                status.pretty_print()?;
            }
        }
    }
    Ok(())
}