/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

use camino::Utf8PathBuf;
use clap::{Parser, Subcommand};
use uniffi_bindgen::bindings::TargetLanguage;
use uniffi_bindgen::BindingGeneratorDefault;

// Structs to help our cmdline parsing. Note that docstrings below form part
// of the "help" output.

/// Scaffolding and bindings generator for Rust
#[derive(Parser)]
#[clap(name = "uniffi-bindgen")]
#[clap(version = clap::crate_version!())]
#[clap(propagate_version = true)]
struct Cli {
    #[clap(subcommand)]
    command: Commands,
}

#[derive(Subcommand)]
enum Commands {
    /// Generate foreign language bindings
    Generate {
        /// Foreign language(s) for which to build bindings.
        #[clap(long, short, value_enum)]
        language: Vec<TargetLanguage>,

        /// Directory in which to write generated files. Default is same folder as .udl file.
        #[clap(long, short)]
        out_dir: Option<Utf8PathBuf>,

        /// Do not try to format the generated bindings.
        #[clap(long, short)]
        no_format: bool,

        /// Path to optional uniffi config file. This config is merged with the `uniffi.toml` config present in each crate, with its values taking precedence.
        #[clap(long, short)]
        config: Option<Utf8PathBuf>,

        /// Extract proc-macro metadata from a native lib (cdylib or staticlib) for this crate.
        #[clap(long)]
        lib_file: Option<Utf8PathBuf>,

        /// Pass in a cdylib path rather than a UDL file
        #[clap(long = "library")]
        library_mode: bool,

        /// When `--library` is passed, only generate bindings for one crate.
        /// When `--library` is not passed, use this as the crate name instead of attempting to
        /// locate and parse Cargo.toml.
        #[clap(long = "crate")]
        crate_name: Option<String>,

        /// Path to the UDL file, or cdylib if `library-mode` is specified
        source: Utf8PathBuf,
    },

    /// Generate Rust scaffolding code
    Scaffolding {
        /// Directory in which to write generated files. Default is same folder as .udl file.
        #[clap(long, short)]
        out_dir: Option<Utf8PathBuf>,

        /// Do not try to format the generated bindings.
        #[clap(long, short)]
        no_format: bool,

        /// Path to the UDL file.
        udl_file: Utf8PathBuf,
    },

    /// Print a debug representation of the interface from a dynamic library
    PrintRepr {
        /// Path to the library file (.so, .dll, .dylib, or .a)
        path: Utf8PathBuf,
    },
}

pub fn run_main() -> anyhow::Result<()> {
    let cli = Cli::parse();
    match cli.command {
        Commands::Generate {
            language,
            out_dir,
            no_format,
            config,
            lib_file,
            source,
            crate_name,
            library_mode,
        } => {
            if library_mode {
                if lib_file.is_some() {
                    panic!("--lib-file is not compatible with --library.")
                }
                let out_dir = out_dir.expect("--out-dir is required when using --library");
                if language.is_empty() {
                    panic!("please specify at least one language with --language")
                }
                uniffi_bindgen::library_mode::generate_bindings(
                    &source,
                    crate_name,
                    &BindingGeneratorDefault {
                        target_languages: language,
                        try_format_code: !no_format,
                    },
                    config.as_deref(),
                    &out_dir,
                    !no_format,
                )?;
            } else {
                uniffi_bindgen::generate_bindings(
                    &source,
                    config.as_deref(),
                    BindingGeneratorDefault {
                        target_languages: language,
                        try_format_code: !no_format,
                    },
                    out_dir.as_deref(),
                    lib_file.as_deref(),
                    crate_name.as_deref(),
                    !no_format,
                )?;
            }
        }
        Commands::Scaffolding {
            out_dir,
            no_format,
            udl_file,
        } => {
            uniffi_bindgen::generate_component_scaffolding(
                &udl_file,
                out_dir.as_deref(),
                !no_format,
            )?;
        }
        Commands::PrintRepr { path } => {
            uniffi_bindgen::print_repr(&path)?;
        }
    };
    Ok(())
}