use std::{fs, path::Path};

use anyhow::{anyhow, Result};
use semver::{Version, VersionReq};

use crate::{
    config::{Config, Manifest, WithPath},
    VERSION,
};

/// Check whether `overflow-checks` codegen option is enabled.
///
/// https://doc.rust-lang.org/rustc/codegen-options/index.html#overflow-checks
pub fn check_overflow(cargo_toml_path: impl AsRef<Path>) -> Result<bool> {
    Manifest::from_path(cargo_toml_path)?
        .profile
        .release
        .as_ref()
        .and_then(|profile| profile.overflow_checks)
        .ok_or(anyhow!(
            "`overflow-checks` is not enabled. To enable, add:\n\n\
    [profile.release]\n\
    overflow-checks = true\n\n\
    in workspace root Cargo.toml",
        ))
}

/// Check whether there is a mismatch between the current CLI version and:
///
/// - `anchor-lang` crate version
/// - `@coral-xyz/anchor` package version
///
/// This function logs warnings in the case of a mismatch.
pub fn check_anchor_version(cfg: &WithPath<Config>) -> Result<()> {
    let cli_version = Version::parse(VERSION)?;

    // Check lang crate
    let mismatched_lang_version = cfg
        .get_rust_program_list()?
        .into_iter()
        .map(|path| path.join("Cargo.toml"))
        .map(cargo_toml::Manifest::from_path)
        .filter_map(|man| man.ok())
        .filter_map(|man| man.dependencies.get("anchor-lang").map(|d| d.to_owned()))
        .filter_map(|dep| Version::parse(dep.req()).ok())
        .find(|ver| ver != &cli_version); // Only log the warning once

    if let Some(ver) = mismatched_lang_version {
        eprintln!(
            "WARNING: `anchor-lang` version({ver}) and the current CLI version({cli_version}) \
                 don't match.\n\n\t\
                 This can lead to unwanted behavior. To use the same CLI version, add:\n\n\t\
                 [toolchain]\n\t\
                 anchor_version = \"{ver}\"\n\n\t\
                 to Anchor.toml\n"
        );
    }

    // Check TS package
    let package_json = {
        let package_json_path = cfg.path().parent().unwrap().join("package.json");
        let package_json_content = fs::read_to_string(package_json_path)?;
        serde_json::from_str::<serde_json::Value>(&package_json_content)?
    };
    let mismatched_ts_version = package_json
        .get("dependencies")
        .and_then(|deps| deps.get("@coral-xyz/anchor"))
        .and_then(|ver| ver.as_str())
        .and_then(|ver| VersionReq::parse(ver).ok())
        .filter(|ver| !ver.matches(&cli_version));

    if let Some(ver) = mismatched_ts_version {
        eprintln!(
            "WARNING: `@coral-xyz/anchor` version({ver}) and the current CLI version\
                ({cli_version}) don't match.\n\n\t\
                This can lead to unwanted behavior. To fix, upgrade the package by running:\n\n\t\
                yarn upgrade @coral-xyz/anchor@{cli_version}\n"
        );
    }

    Ok(())
}

/// Check for potential dependency improvements.
///
/// The main problem people will run into with Solana v2 is that the `solana-program` version
/// specified in users' `Cargo.toml` might be incompatible with `anchor-lang`'s dependency.
/// To fix this and similar problems, users should use the crates exported from `anchor-lang` or
/// `anchor-spl` when possible.
pub fn check_deps(cfg: &WithPath<Config>) -> Result<()> {
    // Check `solana-program`
    cfg.get_rust_program_list()?
        .into_iter()
        .map(|path| path.join("Cargo.toml"))
        .map(cargo_toml::Manifest::from_path)
        .map(|man| man.map_err(|e| anyhow!("Failed to read manifest: {e}")))
        .collect::<Result<Vec<_>>>()?
        .into_iter()
        .filter(|man| man.dependencies.contains_key("solana-program"))
        .for_each(|man| {
            eprintln!(
                "WARNING: Adding `solana-program` as a separate dependency might cause conflicts.\n\
                To solve, remove the `solana-program` dependency and use the exported crate from \
                `anchor-lang`.\n\
                `use solana_program` becomes `use anchor_lang::solana_program`.\n\
                Program name: `{}`\n",
                man.package().name()
            )
        });

    Ok(())
}

/// Check whether the `idl-build` feature is being used correctly.
///
/// **Note:** The check expects the current directory to be a program directory.
pub fn check_idl_build_feature() -> Result<()> {
    let manifest_path = Path::new("Cargo.toml").canonicalize()?;
    let manifest = Manifest::from_path(&manifest_path)?;

    // Check whether the manifest has `idl-build` feature
    let has_idl_build_feature = manifest
        .features
        .iter()
        .any(|(feature, _)| feature == "idl-build");
    if !has_idl_build_feature {
        let anchor_spl_idl_build = manifest
            .dependencies
            .iter()
            .any(|dep| dep.0 == "anchor-spl")
            .then_some(r#", "anchor-spl/idl-build""#)
            .unwrap_or_default();

        return Err(anyhow!(
            r#"`idl-build` feature is missing. To solve, add

[features]
idl-build = ["anchor-lang/idl-build"{anchor_spl_idl_build}]

in `{manifest_path:?}`."#
        ));
    }

    // Check if `idl-build` is enabled by default
    manifest
        .dependencies
        .iter()
        .filter(|(_, dep)| dep.req_features().contains(&"idl-build".into()))
        .for_each(|(name, _)| {
            eprintln!(
                "WARNING: `idl-build` feature of crate `{name}` is enabled by default. \
                    This is not the intended usage.\n\n\t\
                    To solve, do not enable the `idl-build` feature and include crates that have \
                    `idl-build` feature in the `idl-build` feature list:\n\n\t\
                    [features]\n\t\
                    idl-build = [\"{name}/idl-build\", ...]\n"
            )
        });

    // Check `anchor-spl`'s `idl-build` feature
    manifest
        .dependencies
        .get("anchor-spl")
        .and_then(|_| manifest.features.get("idl-build"))
        .map(|feature_list| !feature_list.contains(&"anchor-spl/idl-build".into()))
        .unwrap_or_default()
        .then(|| {
            eprintln!(
                "WARNING: `idl-build` feature of `anchor-spl` is not enabled. \
                This is likely to result in cryptic compile errors.\n\n\t\
                To solve, add `anchor-spl/idl-build` to the `idl-build` feature list:\n\n\t\
                [features]\n\t\
                idl-build = [\"anchor-spl/idl-build\", ...]\n"
            )
        });

    Ok(())
}
