#!/usr/bin/env python3
import sys
import os
import json


def read_asset_map():
    with open("assets.json") as f:
        ret = json.load(f)
    return ret


def read_local_asset_list(f):
    if f is None:
        return []
    ret = []
    for line in f:
        ret.append(line.strip())
    return ret


def asset_needs_update(asset, version):
    if version <= 5 and asset == "textures/spooky/bbh_textures.00800.rgba16.png":
        return True
    if version <= 4 and asset in ["textures/mountain/ttm_textures.01800.rgba16.png", "textures/mountain/ttm_textures.05800.rgba16.png"]:
        return True
    if version <= 3 and asset == "textures/cave/hmc_textures.01800.rgba16.png":
        return True
    if version <= 2 and asset == "textures/inside/inside_castle_textures.09000.rgba16.png":
        return True
    if version <= 1 and asset.endswith(".m64"):
        return True
    if version <= 0 and asset.endswith(".aiff"):
        return True
    return False


def remove_file(fname):
    os.remove(fname)
    print("deleting", fname)
    try:
        os.removedirs(os.path.dirname(fname))
    except OSError:
        pass


def clean_assets(local_asset_file):
    assets = set(read_asset_map().keys())
    assets.update(read_local_asset_list(local_asset_file))
    local_asset_file.close()
    for fname in list(assets) + [".assets-local.txt"]:
        if fname.startswith("@"):
            continue
        try:
            remove_file(fname)
        except FileNotFoundError:
            pass


def main():
    # In case we ever need to change formats of generated files, we keep a
    # revision ID in the local asset file.
    new_version = 6

    try:
        local_asset_file = open(".assets-local.txt")
        local_asset_file.readline()
        local_version = int(local_asset_file.readline().strip())
    except Exception:
        local_asset_file = None
        local_version = -1

    langs = sys.argv[1:]
    if langs == ["--clean"]:
        clean_assets(local_asset_file)
        sys.exit(0)

    all_langs = ["jp", "us", "eu", "sh"]
    if not langs or not all(a in all_langs for a in langs):
        langs_str = " ".join("[" + lang + "]" for lang in all_langs)
        print("Usage: " + sys.argv[0] + " " + langs_str)
        print("For each version, baserom.<version>.z64 must exist")
        sys.exit(1)

    asset_map = read_asset_map()
    all_assets = []
    any_missing_assets = False
    for asset, data in asset_map.items():
        if asset.startswith("@"):
            continue
        if os.path.isfile(asset):
            all_assets.append((asset, data, True))
        else:
            all_assets.append((asset, data, False))
            if not any_missing_assets and any(lang in data[-1] for lang in langs):
                any_missing_assets = True

    if not any_missing_assets and local_version == new_version:
        # Nothing to do, no need to read a ROM. For efficiency we don't check
        # the list of old assets either.
        return

    # Late imports (to optimize startup perf)
    import subprocess
    import hashlib
    import tempfile
    from collections import defaultdict

    new_assets = {a[0] for a in all_assets}

    previous_assets = read_local_asset_list(local_asset_file)
    if local_version == -1:
        # If we have no local asset file, we assume that files are version
        # controlled and thus up to date.
        local_version = new_version

    # Create work list
    todo = defaultdict(lambda: [])
    for (asset, data, exists) in all_assets:
        # Leave existing assets alone if they have a compatible version.
        if exists and not asset_needs_update(asset, local_version):
            continue

        meta = data[:-2]
        size, positions = data[-2:]
        for lang, pos in positions.items():
            mio0 = None if len(pos) == 1 else pos[0]
            pos = pos[-1]
            if lang in langs:
                todo[(lang, mio0)].append((asset, pos, size, meta))
                break

    # Load ROMs
    roms = {}
    for lang in langs:
        fname = "baserom." + lang + ".z64"
        try:
            with open(fname, "rb") as f:
                roms[lang] = f.read()
        except:
            print("Failed to open " + fname + ". Please ensure it exists!")
            sys.exit(1)
        sha1 = hashlib.sha1(roms[lang]).hexdigest()
        with open("sm64." + lang + ".sha1", "r") as f:
            expected_sha1 = f.read().split()[0]
        if sha1 != expected_sha1:
            print(
                fname
                + " has the wrong hash! Found "
                + sha1
                + ", expected "
                + expected_sha1
            )
            sys.exit(1)

    # Make sure tools exist
    subprocess.check_call(
        ["make", "-s", "-C", "tools/", "n64graphics", "skyconv", "mio0", "aifc_decode"]
    )

    # Go through the assets in roughly alphabetical order (but assets in the same
    # mio0 file still go together).
    keys = sorted(list(todo.keys()), key=lambda k: todo[k][0][0])

    # Import new assets
    for key in keys:
        assets = todo[key]
        lang, mio0 = key
        if mio0 == "@sound":
            with tempfile.NamedTemporaryFile(prefix="ctl", delete=False) as ctl_file:
                with tempfile.NamedTemporaryFile(prefix="tbl", delete=False) as tbl_file:
                    rom = roms[lang]
                    size, locs = asset_map["@sound ctl " + lang]
                    offset = locs[lang][0]
                    ctl_file.write(rom[offset : offset + size])
                    ctl_file.close()
                    size, locs = asset_map["@sound tbl " + lang]
                    offset = locs[lang][0]
                    tbl_file.write(rom[offset : offset + size])
                    tbl_file.close()
                    args = [
                        "python3",
                        "tools/disassemble_sound.py",
                        ctl_file.name,
                        tbl_file.name,
                        "--only-samples",
                    ]
                    for (asset, pos, size, meta) in assets:
                        print("extracting", asset)
                        args.append(asset + ":" + str(pos))
                    try:
                        subprocess.run(args, check=True)
                    finally:
                        os.unlink(ctl_file.name)
                        os.unlink(tbl_file.name)
            continue

        if mio0 is not None:
            image = subprocess.run(
                [
                    "./tools/mio0",
                    "-d",
                    "-o",
                    str(mio0),
                    "baserom." + lang + ".z64",
                    "-",
                ],
                check=True,
                stdout=subprocess.PIPE,
            ).stdout
        else:
            image = roms[lang]

        for (asset, pos, size, meta) in assets:
            print("extracting", asset)
            input = image[pos : pos + size]
            os.makedirs(os.path.dirname(asset), exist_ok=True)
            if asset.endswith(".png"):
                with tempfile.NamedTemporaryFile(prefix="asset", delete=False) as png_file:
                    png_file.write(input)
                    png_file.flush()
                    if asset.startswith("textures/skyboxes/") or asset.startswith("levels/ending/cake"):
                        if asset.startswith("textures/skyboxes/"):
                            imagetype = "sky"
                        else:
                            imagetype =  "cake" + ("-eu" if "eu" in asset else "")
                        subprocess.run(
                            [
                                "./tools/skyconv",
                                "--type",
                                imagetype,
                                "--combine",
                                png_file.name,
                                asset,
                            ],
                            check=True,
                        )
                    else:
                        w, h = meta
                        fmt = asset.split(".")[-2]
                        subprocess.run(
                            [
                                "./tools/n64graphics",
                                "-e",
                                png_file.name,
                                "-g",
                                asset,
                                "-f",
                                fmt,
                                "-w",
                                str(w),
                                "-h",
                                str(h),
                            ],
                            check=True,
                        )
            else:
                with open(asset, "wb") as f:
                    f.write(input)

    # Remove old assets
    for asset in previous_assets:
        if asset not in new_assets:
            try:
                remove_file(asset)
            except FileNotFoundError:
                pass

    # Replace the asset list
    output = "\n".join(
        [
            "# This file tracks the assets currently extracted by extract_assets.py.",
            str(new_version),
            *sorted(list(new_assets)),
            "",
        ]
    )
    with open(".assets-local.txt", "w") as f:
        f.write(output)


main()