use std::{
    env,
    ops::Not,
    path::{Path, PathBuf},
};

use blue_build_process_management::drivers::{
    CiDriver, Driver, DriverArgs, InspectDriver, opts::GetMetadataOpts, types::Platform,
};
use blue_build_recipe::Recipe;
use blue_build_template::{ContainerFileTemplate, Template};
use blue_build_utils::{
    constants::{
        BB_SKIP_VALIDATION, BUILD_SCRIPTS_IMAGE_REF, CONFIG_PATH, RECIPE_FILE, RECIPE_PATH,
    },
    syntax_highlighting::{self, DefaultThemes},
};
use bon::Builder;
use cached::proc_macro::cached;
use clap::{Args, crate_version};
use log::{debug, info, trace, warn};
use miette::{IntoDiagnostic, Result};
use oci_distribution::Reference;

use crate::{commands::validate::ValidateCommand, shadow};

use super::BlueBuildCommand;

#[derive(Debug, Clone, Args, Builder)]
pub struct GenerateCommand {
    /// The recipe file to create a template from
    #[arg()]
    #[builder(into)]
    recipe: Option<PathBuf>,

    /// File to output to instead of STDOUT
    #[arg(short, long)]
    #[builder(into)]
    output: Option<PathBuf>,

    /// The registry domain the image will be published to.
    ///
    /// This is used for modules that need to know where
    /// the image is being published (i.e. the signing module).
    #[arg(long)]
    #[builder(into)]
    registry: Option<String>,

    /// The registry namespace the image will be published to.
    ///
    /// This is used for modules that need to know where
    /// the image is being published (i.e. the signing module).
    #[arg(long)]
    #[builder(into)]
    registry_namespace: Option<String>,

    /// Instead of creating a Containerfile, display
    /// the full recipe after traversing all `from-file` properties.
    ///
    /// This can be used to help debug the order
    /// you defined your recipe.
    #[arg(short, long)]
    #[builder(default)]
    display_full_recipe: bool,

    /// Choose a theme for the syntax highlighting
    /// for the Containerfile or Yaml.
    ///
    /// The default is `mocha-dark`.
    #[arg(short = 't', long)]
    syntax_theme: Option<DefaultThemes>,

    /// Inspect the image for a specific platform
    /// when retrieving the version.
    #[arg(long)]
    platform: Option<Platform>,

    /// Skips validation of the recipe file.
    #[arg(long, env = BB_SKIP_VALIDATION)]
    #[builder(default)]
    skip_validation: bool,

    #[clap(flatten)]
    #[builder(default)]
    drivers: DriverArgs,
}

impl BlueBuildCommand for GenerateCommand {
    fn try_run(&mut self) -> Result<()> {
        Driver::init(self.drivers);

        self.template_file()
    }
}

impl GenerateCommand {
    fn template_file(&self) -> Result<()> {
        trace!("TemplateCommand::template_file()");

        let recipe_path = self.recipe.clone().unwrap_or_else(|| {
            let legacy_path = Path::new(CONFIG_PATH);
            let recipe_path = Path::new(RECIPE_PATH);
            if recipe_path.exists() && recipe_path.is_dir() {
                recipe_path.join(RECIPE_FILE)
            } else {
                warn!("Use of {CONFIG_PATH} for recipes is deprecated, please move your recipe files into {RECIPE_PATH}");
                legacy_path.join(RECIPE_FILE)
            }
        });

        if self.skip_validation.not() {
            ValidateCommand::builder()
                .recipe(recipe_path.clone())
                .build()
                .try_run()?;
        }

        let registry = if let (Some(registry), Some(registry_namespace)) =
            (&self.registry, &self.registry_namespace)
        {
            format!("{registry}/{registry_namespace}")
        } else {
            Driver::get_registry()?
        };

        debug!("Deserializing recipe");
        let recipe = Recipe::parse(&recipe_path)?;
        trace!("recipe_de: {recipe:#?}");

        if self.display_full_recipe {
            if let Some(output) = self.output.as_ref() {
                std::fs::write(output, serde_yaml::to_string(&recipe).into_diagnostic()?)
                    .into_diagnostic()?;
            } else {
                syntax_highlighting::print_ser(&recipe, "yml", self.syntax_theme)?;
            }
            return Ok(());
        }

        info!("Templating for recipe at {}", recipe_path.display());

        let base_image: Reference = format!("{}:{}", &recipe.base_image, &recipe.image_version)
            .parse()
            .into_diagnostic()?;
        let base_digest = &Driver::get_metadata(
            GetMetadataOpts::builder()
                .image(&base_image)
                .maybe_platform(self.platform)
                .build(),
        )?
        .digest;
        let build_scripts_image = &determine_scripts_tag(self.platform)?;
        let repo = &Driver::get_repo_url()?;
        let build_features = &[
            #[cfg(feature = "bootc")]
            "bootc".into(),
        ];

        let template = ContainerFileTemplate::builder()
            .os_version(
                Driver::get_os_version()
                    .oci_ref(&recipe.base_image_ref()?)
                    .maybe_platform(self.platform)
                    .call()?,
            )
            .build_id(Driver::get_build_id())
            .recipe(&recipe)
            .recipe_path(recipe_path.as_path())
            .registry(&registry)
            .repo(repo)
            .build_scripts_image(build_scripts_image)
            .base_digest(base_digest)
            .maybe_nushell_version(recipe.nushell_version.as_ref())
            .build_features(build_features)
            .build();

        let output_str = template.render().into_diagnostic()?;
        if let Some(output) = self.output.as_ref() {
            debug!("Templating to file {}", output.display());
            trace!("Containerfile:\n{output_str}");

            std::fs::write(output, output_str).into_diagnostic()?;
        } else {
            debug!("Templating to stdout");
            syntax_highlighting::print(&output_str, "Dockerfile", self.syntax_theme)?;
        }

        Ok(())
    }
}

#[cached(
    result = true,
    key = "Option<Platform>",
    convert = r#"{ platform }"#,
    sync_writes = "by_key"
)]
fn determine_scripts_tag(platform: Option<Platform>) -> Result<Reference> {
    trace!("determine_scripts_tag({platform:?})");

    let opts = GetMetadataOpts::builder().maybe_platform(platform);
    format!("{BUILD_SCRIPTS_IMAGE_REF}:{}", shadow::COMMIT_HASH)
        .parse()
        .into_diagnostic()
        .and_then(|image| {
            Driver::get_metadata(opts.clone().image(&image).build())
                .inspect_err(|e| trace!("{e:?}"))
                .map(|_| image)
        })
        .or_else(|_| {
            let image: Reference = format!("{BUILD_SCRIPTS_IMAGE_REF}:{}", shadow::BRANCH)
                .parse()
                .into_diagnostic()?;
            Driver::get_metadata(opts.clone().image(&image).build())
                .inspect_err(|e| trace!("{e:?}"))
                .map(|_| image)
        })
        .or_else(|_| {
            let image: Reference = format!("{BUILD_SCRIPTS_IMAGE_REF}:v{}", crate_version!())
                .parse()
                .into_diagnostic()?;
            Driver::get_metadata(opts.image(&image).build())
                .inspect_err(|e| trace!("{e:?}"))
                .map(|_| image)
        })
        .inspect(|image| debug!("Using build scripts image: {image}"))
}