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use std::io::prelude::*;

use toml;

use core::resolver::WorkspaceResolve;
use core::{resolver, Resolve, Workspace};
use util::errors::{CargoResult, CargoResultExt};
use util::toml as cargo_toml;
use util::Filesystem;

pub fn load_pkg_lockfile(ws: &Workspace) -> CargoResult<Option<Resolve>> {
    if !ws.root().join("Cargo.lock").exists() {
        return Ok(None);
    }

    let root = Filesystem::new(ws.root().to_path_buf());
    let mut f = root.open_ro("Cargo.lock", ws.config(), "Cargo.lock file")?;

    let mut s = String::new();
    f.read_to_string(&mut s)
        .chain_err(|| format!("failed to read file: {}", f.path().display()))?;

    let resolve = (|| -> CargoResult<Option<Resolve>> {
        let resolve: toml::Value = cargo_toml::parse(&s, f.path(), ws.config())?;
        let v: resolver::EncodableResolve = resolve.try_into()?;
        Ok(Some(v.into_resolve(ws)?))
    })()
    .chain_err(|| format!("failed to parse lock file at: {}", f.path().display()))?;
    Ok(resolve)
}

pub fn write_pkg_lockfile(ws: &Workspace, resolve: &Resolve) -> CargoResult<()> {
    // Load the original lockfile if it exists.
    let ws_root = Filesystem::new(ws.root().to_path_buf());
    let orig = ws_root.open_ro("Cargo.lock", ws.config(), "Cargo.lock file");
    let orig = orig.and_then(|mut f| {
        let mut s = String::new();
        f.read_to_string(&mut s)?;
        Ok(s)
    });

    let toml = toml::Value::try_from(WorkspaceResolve { ws, resolve }).unwrap();

    let mut out = String::new();

    // Preserve the top comments in the lockfile
    // This is in preparation for marking it as generated
    // https://github.com/rust-lang/cargo/issues/6180
    if let Ok(orig) = &orig {
        for line in orig.lines().take_while(|line| line.starts_with('#')) {
            out.push_str(line);
            out.push_str("\n");
        }
    }

    let deps = toml["package"].as_array().unwrap();
    for dep in deps.iter() {
        let dep = dep.as_table().unwrap();

        out.push_str("[[package]]\n");
        emit_package(dep, &mut out);
    }

    if let Some(patch) = toml.get("patch") {
        let list = patch["unused"].as_array().unwrap();
        for entry in list {
            out.push_str("[[patch.unused]]\n");
            emit_package(entry.as_table().unwrap(), &mut out);
            out.push_str("\n");
        }
    }

    if let Some(meta) = toml.get("metadata") {
        out.push_str("[metadata]\n");
        out.push_str(&meta.to_string());
    }

    // If the lockfile contents haven't changed so don't rewrite it. This is
    // helpful on read-only filesystems.
    if let Ok(orig) = orig {
        if are_equal_lockfiles(orig, &out, ws) {
            return Ok(());
        }
    }

    if !ws.config().lock_update_allowed() {
        if ws.config().cli_unstable().offline {
            bail!("can't update in the offline mode");
        }

        let flag = if ws.config().network_allowed() {
            "--locked"
        } else {
            "--frozen"
        };
        bail!(
            "the lock file {} needs to be updated but {} was passed to \
             prevent this",
            ws.root().to_path_buf().join("Cargo.lock").display(),
            flag
        );
    }

    // Ok, if that didn't work just write it out
    ws_root
        .open_rw("Cargo.lock", ws.config(), "Cargo.lock file")
        .and_then(|mut f| {
            f.file().set_len(0)?;
            f.write_all(out.as_bytes())?;
            Ok(())
        })
        .chain_err(|| format!("failed to write {}", ws.root().join("Cargo.lock").display()))?;
    Ok(())
}

fn are_equal_lockfiles(mut orig: String, current: &str, ws: &Workspace) -> bool {
    if has_crlf_line_endings(&orig) {
        orig = orig.replace("\r\n", "\n");
    }

    // If we want to try and avoid updating the lockfile, parse both and
    // compare them; since this is somewhat expensive, don't do it in the
    // common case where we can update lockfiles.
    if !ws.config().lock_update_allowed() {
        let res: CargoResult<bool> = (|| {
            let old: resolver::EncodableResolve = toml::from_str(&orig)?;
            let new: resolver::EncodableResolve = toml::from_str(current)?;
            Ok(old.into_resolve(ws)? == new.into_resolve(ws)?)
        })();
        if let Ok(true) = res {
            return true;
        }
    }

    current == orig
}

fn has_crlf_line_endings(s: &str) -> bool {
    // Only check the first line.
    if let Some(lf) = s.find('\n') {
        s[..lf].ends_with('\r')
    } else {
        false
    }
}

fn emit_package(dep: &toml::value::Table, out: &mut String) {
    out.push_str(&format!("name = {}\n", &dep["name"]));
    out.push_str(&format!("version = {}\n", &dep["version"]));

    if dep.contains_key("source") {
        out.push_str(&format!("source = {}\n", &dep["source"]));
    }

    if let Some(s) = dep.get("dependencies") {
        let slice = s.as_array().unwrap();

        if !slice.is_empty() {
            out.push_str("dependencies = [\n");

            for child in slice.iter() {
                out.push_str(&format!(" {},\n", child));
            }

            out.push_str("]\n");
        }
        out.push_str("\n");
    } else if dep.contains_key("replace") {
        out.push_str(&format!("replace = {}\n\n", &dep["replace"]));
    }
}