//! Shell-free argv construction for plugin-owned run targets.
use ide_core::remote_settings::PluginRunTarget;
use ide_core::{IdeError, IdeResult};
use ide_run::{RunConfig, wrap};
use std::path::Path;

/// Validates a bounded target before replacing an existing registration.
pub fn validate(target: &PluginRunTarget) -> IdeResult<()> {
    let label = |s: &str, max: usize| !s.is_empty() && s.len() <= max && !s.chars().any(char::is_control);
    if !label(&target.id, 128) || !label(&target.name, 256) || !label(&target.program, 256) {
        return Err(IdeError::invalid("invalid run target id, name or program"));
    }
    let argv = |args: &[String]| args.len() <= 256 && args.iter().all(|a| a.len() <= 16384 && !a.contains('\0'));
    let mut names = std::collections::BTreeSet::new();
    if !argv(&target.args)
        || !argv(&target.workdir_args)
        || target.commands.len() > 64
        || target.commands.iter().any(|(name, args)| {
            !label(name, 256) || wrap::program_name(name) != *name || !names.insert(name) || !argv(args)
        })
        || serde_json::to_vec(target).map_or(true, |v| v.len() > 256 << 10)
        || target
            .container_root
            .as_ref()
            .is_some_and(|r| !r.starts_with('/') || r.contains(['\0', '\n', '\r']) || r.split('/').any(|p| p == ".."))
    {
        return Err(IdeError::invalid("invalid run target arguments or container root"));
    }
    Ok(())
}

/// Wraps argv, keeping the local cwd and environment for the approved wrapper.
/// The wrapper decides whether to forward environment into its container.
pub fn prepare(root: &Path, target: &PluginRunTarget, program: &Path, config: &RunConfig) -> IdeResult<RunConfig> {
    validate(target)?;
    let cwd = wrap::run_dir(root, config);
    let root = dunce::canonicalize(root).unwrap_or_else(|_| root.to_path_buf());
    let cwd = dunce::canonicalize(&cwd).unwrap_or(cwd);
    let relative =
        cwd.strip_prefix(&root).ok().filter(|p| !p.components().any(|c| matches!(c, std::path::Component::ParentDir)));
    let mapped_cwd = target.container_root.as_deref().zip(relative).map(|(container, rel)| {
        if rel.as_os_str().is_empty() {
            container.to_owned()
        } else {
            format!("{}/{}", container.trim_end_matches('/'), rel.to_string_lossy().replace('\\', "/"))
        }
    });
    let mapped = target
        .container_root
        .as_deref()
        .map(|container| crate::target::argv_command(config, &Default::default(), &root, container));
    let command = mapped.as_ref().map_or_else(
        || {
            let p = Path::new(&config.command);
            if p.is_absolute() && !p.starts_with(&root) {
                wrap::program_name(&config.command)
            } else {
                config.command.clone()
            }
        },
        |m| m.program.clone(),
    );
    let name = wrap::program_name(&config.command);
    let override_args = target.commands.iter().find(|(n, _)| n == &name).map(|(_, a)| a);
    let mut args = override_args.unwrap_or(&target.args).clone();
    if let Some(cwd) = mapped_cwd {
        args.extend(target.workdir_args.iter().map(|a| a.replace("{cwd}", &cwd)));
    }
    if override_args.is_none() {
        args.push(command);
    }
    args.extend(mapped.as_ref().map_or_else(|| config.args.clone(), |m| m.args.clone()));
    let mut result = config.clone();
    result.command = program.to_string_lossy().into_owned();
    result.args = args;
    result.cwd = Some(cwd.into());
    result.extras.target = None;
    // A wrapper's -c/-e are its own flags, not interpreter flags to inspect.
    result.kind = "shell".into();
    Ok(result)
}

#[cfg(test)]
mod tests {
    use super::*;
    fn config(command: &str, args: &[&str], cwd: &str) -> RunConfig {
        serde_json::from_value(serde_json::json!({"id":"test", "name":"Test", "kind":"php", "command":command, "args":args, "cwd":cwd, "env":{}, "detected":false, "isTest":false})).unwrap()
    }
    #[test]
    fn prefix_override_cwd_and_literal_argv() {
        let target = PluginRunTarget {
            id: "ddev".into(),
            name: "DDEV".into(),
            program: "ddev".into(),
            args: vec!["exec".into()],
            workdir_args: vec!["--dir".into(), "{cwd}".into()],
            container_root: Some("/var/www/html".into()),
            commands: vec![("composer".into(), vec!["composer".into()])],
        };
        let tmp = tempfile::tempdir().unwrap();
        let base = dunce::canonicalize(tmp.path()).unwrap();
        let root = base.join("project");
        std::fs::create_dir_all(root.join("src")).unwrap();
        let program = base.join("approved/ddev");
        let php = base.join("tools/php");
        let run =
            prepare(&root, &target, &program, &config(php.to_str().unwrap(), &["x.php", "$(touch bad); a b"], "src"))
                .unwrap();
        assert_eq!(Path::new(&run.command), program);
        assert_eq!(run.args, ["exec", "--dir", "/var/www/html/src", "php", "x.php", "$(touch bad); a b"]);
        assert_eq!(run.cwd.unwrap(), root.join("src"));
        let outside = base.join("outside");
        let run = prepare(
            &root,
            &target,
            &program,
            &config(r"C:\tools\composer.exe", &["install"], outside.to_str().unwrap()),
        )
        .unwrap();
        assert_eq!(run.args, ["composer", "install"]);
        let in_project = prepare(&root, &target, &program, &config("/tools/composer", &["install"], "src")).unwrap();
        assert_eq!(in_project.args, ["composer", "--dir", "/var/www/html/src", "install"]);
        let run = prepare(&root, &target, &program, &config("composer", &["install"], "../outside")).unwrap();
        assert_eq!(run.args, ["composer", "install"]);
        let mut target = target;
        target.container_root = None;
        let run = prepare(&root, &target, &program, &config("php", &["x.php"], "src")).unwrap();
        assert_eq!(run.args, ["exec", "php", "x.php"]);
        let run = prepare(&root, &target, &program, &config("echo a; touch bad", &[], ".")).unwrap();
        assert_eq!(run.args, ["exec", "echo a; touch bad"]);
    }

    #[test]
    fn command_overrides_match_both_path_separators_on_every_platform() {
        let tmp = tempfile::tempdir().unwrap();
        let target = PluginRunTarget {
            id: "ddev".into(),
            name: "DDEV".into(),
            program: "ddev".into(),
            args: vec!["exec".into()],
            workdir_args: Vec::new(),
            container_root: Some("/container".into()),
            commands: vec![("php".into(), vec!["php".into()])],
        };
        for command in ["php", "/usr/bin/php", r"C:\tools\php.exe", r"\\?\C:\tools\php.exe", "C:/tools/php.cmd"] {
            for container_root in [None, target.container_root.clone()] {
                let target = PluginRunTarget { container_root, ..target.clone() };
                let run = prepare(tmp.path(), &target, Path::new("ddev"), &config(command, &["x.php"], ".")).unwrap();
                assert_eq!(run.args, ["php", "x.php"], "{command}");
            }
        }
    }

    #[cfg(windows)]
    #[test]
    fn plain_and_verbatim_roots_map_project_commands_and_cwds() {
        let tmp = tempfile::tempdir().unwrap();
        std::fs::create_dir(tmp.path().join("src")).unwrap();
        let root = dunce::canonicalize(tmp.path()).unwrap();
        let verbatim = std::fs::canonicalize(tmp.path()).unwrap();
        let target = PluginRunTarget {
            id: "ddev".into(),
            name: "DDEV".into(),
            program: "ddev".into(),
            args: vec!["exec".into()],
            workdir_args: vec!["--dir={cwd}".into()],
            container_root: Some("/container".into()),
            commands: Vec::new(),
        };
        let command = root.join("tool.exe");
        for project in [&root, &verbatim] {
            for cwd in [root.join("src"), verbatim.join("src")] {
                let run = prepare(
                    project,
                    &target,
                    Path::new("ddev"),
                    &config(command.to_str().unwrap(), &["arg"], cwd.to_str().unwrap()),
                )
                .unwrap();
                assert_eq!(run.args, ["exec", "--dir=/container/src", "/container/tool.exe", "arg"]);
                assert_eq!(run.cwd.unwrap(), root.join("src"));
            }
        }
    }
}