#![allow(clippy::needless_borrow)]
use std::path::PathBuf;

use anyhow::{bail, Result};
use argp::FromArgs;
use cwdemangle::{demangle, DemangleOptions};

use crate::util::{
    file::{map_file, map_reader},
    map::{process_map, SymbolEntry, SymbolRef},
};

#[derive(FromArgs, PartialEq, Debug)]
/// Commands for processing CodeWarrior maps.
#[argp(subcommand, name = "map")]
pub struct Args {
    #[argp(subcommand)]
    command: SubCommand,
}

#[derive(FromArgs, PartialEq, Debug)]
#[argp(subcommand)]
enum SubCommand {
    Entries(EntriesArgs),
    Symbol(SymbolArgs),
    Order(OrderArgs),
    Slices(SlicesArgs),
    Symbols(SymbolsArgs),
}

#[derive(FromArgs, PartialEq, Eq, Debug)]
/// Displays all entries for a particular TU.
#[argp(subcommand, name = "entries")]
pub struct EntriesArgs {
    #[argp(positional)]
    /// path to input map
    map_file: PathBuf,
    #[argp(positional)]
    /// TU to display entries for
    unit: String,
}

#[derive(FromArgs, PartialEq, Eq, Debug)]
/// Displays all references to a symbol.
#[argp(subcommand, name = "symbol")]
pub struct SymbolArgs {
    #[argp(positional)]
    /// path to input map
    map_file: PathBuf,
    #[argp(positional)]
    /// symbol to display references for
    symbol: String,
}

#[derive(FromArgs, PartialEq, Eq, Debug)]
/// Attempts to resolve global link order.
#[argp(subcommand, name = "order")]
pub struct OrderArgs {
    #[argp(positional)]
    /// path to input map
    map_file: PathBuf,
}

#[derive(FromArgs, PartialEq, Eq, Debug)]
/// Emits a slices.yml for ppcdis. (WIP)
#[argp(subcommand, name = "slices")]
pub struct SlicesArgs {
    #[argp(positional)]
    /// path to input map
    map_file: PathBuf,
}

#[derive(FromArgs, PartialEq, Eq, Debug)]
/// Emits a symbols.yml for ppcdis. (WIP)
#[argp(subcommand, name = "symbols")]
pub struct SymbolsArgs {
    #[argp(positional)]
    /// path to input map
    map_file: PathBuf,
}

pub fn run(args: Args) -> Result<()> {
    match args.command {
        SubCommand::Entries(c_args) => entries(c_args),
        SubCommand::Symbol(c_args) => symbol(c_args),
        SubCommand::Order(c_args) => order(c_args),
        SubCommand::Slices(c_args) => slices(c_args),
        SubCommand::Symbols(c_args) => symbols(c_args),
    }
}

fn entries(args: EntriesArgs) -> Result<()> {
    let map = map_file(&args.map_file)?;
    let entries = process_map(map_reader(&map))?;
    match entries.unit_entries.get_vec(&args.unit) {
        Some(vec) => {
            for symbol_ref in vec {
                if symbol_ref.name.starts_with('@') {
                    continue;
                }
                let demangled = demangle(&symbol_ref.name, &DemangleOptions::default());
                println!("{}", demangled.as_deref().unwrap_or(&symbol_ref.name));
            }
        }
        None => bail!("Failed to find entries for TU '{}' in map", args.unit),
    }
    Ok(())
}

fn symbol(args: SymbolArgs) -> Result<()> {
    let map = map_file(&args.map_file)?;
    let entries = process_map(map_reader(&map))?;
    let opt_ref: Option<(SymbolRef, SymbolEntry)> = None;

    _ = entries;
    _ = opt_ref;
    // TODO

    // for (symbol_ref, entry) in &entries.symbols {
    //     if symbol_ref.name == args.symbol {
    //         ensure!(opt_ref.is_none(), "Symbol '{}' found in multiple TUs", args.symbol);
    //         opt_ref = Some((symbol_ref.clone(), entry.clone()));
    //     }
    // }
    // match opt_ref {
    //     Some((symbol_ref, symbol)) => {
    //         println!("Located symbol {}", symbol.demangled.as_ref().unwrap_or(&symbol.name));
    //         if let Some(vec) = entries.entry_references.get_vec(&symbol_ref) {
    //             println!("\nReferences:");
    //             for x in vec {
    //                 if let Some(reference) = entries.symbols.get(x) {
    //                     println!(
    //                         ">>> {} ({:?},{:?}) [{}]",
    //                         reference.demangled.as_ref().unwrap_or(&reference.name),
    //                         reference.kind,
    //                         reference.visibility,
    //                         reference.unit.as_deref().unwrap_or("[generated]")
    //                     );
    //                 } else {
    //                     println!(">>> {} (NOT FOUND)", x.name);
    //                 }
    //             }
    //         }
    //         if let Some(vec) = entries.entry_referenced_from.get_vec(&symbol_ref) {
    //             println!("\nReferenced from:");
    //             for x in vec {
    //                 if let Some(reference) = entries.symbols.get(x) {
    //                     println!(
    //                         ">>> {} ({:?}, {:?}) [{}]",
    //                         reference.demangled.as_ref().unwrap_or(&reference.name),
    //                         reference.kind,
    //                         reference.visibility,
    //                         reference.unit.as_deref().unwrap_or("[generated]")
    //                     );
    //                 } else {
    //                     println!(">>> {} (NOT FOUND)", x.name);
    //                 }
    //             }
    //         }
    //         println!("\n");
    //     }
    //     None => bail!("Failed to find symbol '{}' in map", args.symbol),
    // }
    Ok(())
}

fn order(args: OrderArgs) -> Result<()> {
    let map = map_file(&args.map_file)?;
    let entries = process_map(map_reader(&map))?;

    _ = entries;
    // TODO

    // let order = resolve_link_order(&entries.unit_order)?;
    // for unit in order {
    //     println!("{unit}");
    // }
    Ok(())
}

fn slices(args: SlicesArgs) -> Result<()> {
    let map = map_file(&args.map_file)?;
    let entries = process_map(map_reader(&map))?;

    _ = entries;
    // TODO

    // let order = resolve_link_order(&entries.unit_order)?;
    // for unit in order {
    //     let unit_path = if let Some((lib, name)) = unit.split_once(' ') {
    //         format!("{}/{}", lib.strip_suffix(".a").unwrap_or(lib), name)
    //     } else if let Some(strip) = unit.strip_suffix(".o") {
    //         format!("{strip}.c")
    //     } else {
    //         unit.clone()
    //     };
    //     println!("{unit_path}:");
    //     let mut ranges = Vec::<(String, Range<u32>)>::new();
    //     match entries.unit_section_ranges.get(&unit) {
    //         Some(sections) => {
    //             for (name, range) in sections {
    //                 ranges.push((name.clone(), range.clone()));
    //             }
    //         }
    //         None => bail!("Failed to locate sections for unit '{unit}'"),
    //     }
    //     ranges.sort_by(|(_, a), (_, b)| a.start.cmp(&b.start));
    //     for (name, range) in ranges {
    //         println!("\t{}: [{:#010x}, {:#010x}]", name, range.start, range.end);
    //     }
    // }
    Ok(())
}

fn symbols(args: SymbolsArgs) -> Result<()> {
    let map = map_file(&args.map_file)?;
    let entries = process_map(map_reader(&map))?;

    _ = entries;
    // TODO

    // for (address, symbol) in entries.address_to_symbol {
    //     if symbol.name.starts_with('@') {
    //         continue;
    //     }
    //     println!("{:#010x}: {}", address, symbol.name);
    // }
    Ok(())
}