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

fn zlib() {
    if !Path::new("zlib/.git").exists() {
        git_submodule_update();
    }

    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());

    let mut cfg = cc::Build::new();
    cfg.warnings(false);
    let build_dir = out_dir.join("zlib-build");
    fs::create_dir_all(&build_dir).unwrap();
    cfg.out_dir(&build_dir);
    cfg.file("zlib/adler32.c")
        .file("zlib/compress.c")
        .file("zlib/crc32.c")
        .file("zlib/deflate.c")
        .file("zlib/gzclose.c")
        .file("zlib/gzlib.c")
        .file("zlib/gzread.c")
        .file("zlib/gzwrite.c")
        .file("zlib/inflate.c")
        .file("zlib/infback.c")
        .file("zlib/inftrees.c")
        .file("zlib/inffast.c")
        .file("zlib/trees.c")
        .file("zlib/uncompr.c")
        .file("zlib/zutil.c");
    cfg.include("zlib");
    cfg.define("HAVE_SYS_TYPES_H", None);
    cfg.define("HAVE_STDINT_H", None);
    cfg.define("HAVE_STDDEF_H", None);
    let target = env::var("TARGET").unwrap();
    if !target.contains("windows") {
        cfg.define("_LARGEFILE64_SOURCE", Some("1"));
    }
    cfg.compile("z");
}

fn libpng() {
    if !Path::new("libpng/.git").exists() {
        git_submodule_update();
    }

    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());

    let mut cfg = cc::Build::new();
    cfg.warnings(false);
    let build_dir = out_dir.join("png-build");
    fs::create_dir_all(&build_dir).unwrap();
    cfg.out_dir(&build_dir);

    cfg.file("libpng/png.c")
        .file("libpng/pngerror.c")
        .file("libpng/pngget.c")
        .file("libpng/pngmem.c")
        .file("libpng/pngpread.c")
        .file("libpng/pngread.c")
        .file("libpng/pngrio.c")
        .file("libpng/pngrtran.c")
        .file("libpng/pngrutil.c")
        .file("libpng/pngset.c")
        .file("libpng/pngtrans.c")
        .file("libpng/pngwio.c")
        .file("libpng/pngwrite.c")
        .file("libpng/pngwtran.c")
        .file("libpng/pngwutil.c");

    cfg.include("zlib");
    cfg.include("libpng");
    cfg.include(&build_dir);
    cfg.define("HAVE_SYS_TYPES_H", None);
    cfg.define("HAVE_STDINT_H", None);
    cfg.define("HAVE_STDDEF_H", None);
    let target = env::var("TARGET").unwrap();
    if !target.contains("windows") {
        cfg.define("_LARGEFILE64_SOURCE", Some("1"));
    }

    fs::write(
        build_dir.join("pnglibconf.h"),
        fs::read_to_string("libpng/scripts/pnglibconf.h.prebuilt").unwrap(),
    )
    .unwrap();

    cfg.compile("png");
}

fn freetype() {
    if !Path::new("freetype2/.git").exists() {
        git_submodule_update();
    }

    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());

    let mut cfg = cc::Build::new();
    cfg.warnings(false);
    let build_dir = out_dir.join("freetype-build");
    fs::create_dir_all(&build_dir).unwrap();
    cfg.out_dir(&build_dir);
    cfg.include("zlib");
    cfg.include("libpng");
    cfg.include(out_dir.join("png-build"));

    fs::create_dir_all(build_dir.join("freetype2/include/freetype/config")).unwrap();
    cfg.include(format!("{}/freetype2/include", build_dir.display()));
    cfg.include("freetype2/include");
    cfg.define("FT2_BUILD_LIBRARY", None);

    let target = env::var("TARGET").unwrap();
    let ftconfig = if !target.contains("windows") {
        fs::read_to_string("freetype2/builds/unix/ftconfig.in")
            .unwrap()
            .replace("#undef HAVE_UNISTD_H", "#define HAVE_UNISTD_H 1")
            .replace("#undef HAVE_FCNTL_H", "#define HAVE_FCNTL_H 1")
            .replace("#undef HAVE_STDINT_H", "#define HAVE_STDINT_H 1")
            .replace("/undef", "#undef")
    } else {
        fs::read_to_string("freetype2/include/freetype/config/ftconfig.h").unwrap()
    };

    fs::write(
        build_dir.join("freetype2/include/freetype/config/ftconfig.h"),
        ftconfig,
    )
    .unwrap();

    fs::write(
        build_dir.join("freetype2/include/freetype/config/ftoption.h"),
        fs::read_to_string("freetype2/include/freetype/config/ftoption.h")
            .unwrap()
            .replace(
                "/* #define FT_CONFIG_OPTION_SYSTEM_ZLIB */",
                "#define FT_CONFIG_OPTION_SYSTEM_ZLIB",
            )
            .replace(
                "/* #define FT_CONFIG_OPTION_USE_PNG */",
                "#define FT_CONFIG_OPTION_USE_PNG",
            ),
    )
    .unwrap();

    for f in [
        "autofit/autofit.c",
        "base/ftbase.c",
        "base/ftbbox.c",
        "base/ftbdf.c",
        "base/ftbitmap.c",
        "base/ftcid.c",
        "base/ftfstype.c",
        "base/ftgasp.c",
        "base/ftglyph.c",
        "base/ftgxval.c",
        "base/ftinit.c",
        "base/ftmm.c",
        "base/ftotval.c",
        "base/ftpatent.c",
        "base/ftpfr.c",
        "base/ftstroke.c",
        "base/ftsynth.c",
        "base/ftsystem.c",
        "base/fttype1.c",
        "base/ftwinfnt.c",
        "bdf/bdf.c",
        "bzip2/ftbzip2.c",
        "cache/ftcache.c",
        "cff/cff.c",
        "cid/type1cid.c",
        "gzip/ftgzip.c",
        "lzw/ftlzw.c",
        "pcf/pcf.c",
        "pfr/pfr.c",
        "psaux/psaux.c",
        "pshinter/pshinter.c",
        "psnames/psnames.c",
        "raster/raster.c",
        "sfnt/sfnt.c",
        "smooth/smooth.c",
        "truetype/truetype.c",
        "type1/type1.c",
        "type42/type42.c",
        "winfonts/winfnt.c",
    ]
    .iter()
    {
        cfg.file(format!("freetype2/src/{}", f));
    }

    if target.contains("windows") {
        cfg.file("freetype2/builds/windows/ftdebug.c");
    } else {
        cfg.file("freetype2/src/base/ftdebug.c");
    }

    cfg.compile("freetype");

    // These cause DEP_FREETYPE_INCLUDE and DEP_FREETYPE_LIB to be
    // defined in the harfbuzz/build.rs
    println!(
        "cargo:include={}/include/freetype2;{}/freetype2/include",
        build_dir.display(),
        std::env::current_dir().unwrap().display()
    );
    println!("cargo:lib={}", build_dir.display());
}

fn git_submodule_update() {
    let _ = std::process::Command::new("git")
        .args(&["submodule", "update", "--init"])
        .status();
}

fn main() {
    zlib();
    libpng();
    freetype();
    let out_dir = env::var("OUT_DIR").unwrap();
    println!("cargo:outdir={}", out_dir);
}