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// Copyright 2025 Shota FUJI
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0

//! This script executes linuxdeploy tool against build output directory.

const std = @import("std");

const ExitCode = enum(u8) {
    ok = 0,
    generic_error = 1,
    incorrect_usage = 2,

    pub inline fn to_u8(self: @This()) u8 {
        return @intFromEnum(self);
    }
};

pub fn main() !u8 {
    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
    defer arena.deinit();

    const allocator = arena.allocator();

    var args = try std.process.ArgIterator.initWithAllocator(allocator);
    defer args.deinit();

    var arg_linuxdeploy: ?[]const u8 = null;
    var arg_exe: ?[]const u8 = null;
    var arg_desktop_entry: ?[]const u8 = null;
    var arg_icon: ?[]const u8 = null;
    var arg_out: ?[]const u8 = null;
    var arg_appdir: ?[]const u8 = null;

    // Skip exe name
    _ = args.skip();

    while (args.next()) |arg| {
        var iter = std.mem.splitScalar(u8, arg, '=');
        const key = iter.next() orelse {
            continue;
        };

        const value = iter.next() orelse {
            std.log.err("Arg must be --key=value format (parsing {s})", .{key});
            return ExitCode.incorrect_usage.to_u8();
        };

        if (std.mem.eql(u8, "--linuxdeploy", key)) {
            arg_linuxdeploy = value;
            continue;
        }

        if (std.mem.eql(u8, "--exe", key)) {
            arg_exe = value;
            continue;
        }

        if (std.mem.eql(u8, "--desktop-entry", key)) {
            arg_desktop_entry = value;
            continue;
        }

        if (std.mem.eql(u8, "--icon", key)) {
            arg_icon = value;
            continue;
        }

        if (std.mem.eql(u8, "--out", key)) {
            arg_out = value;
            continue;
        }

        if (std.mem.eql(u8, "--appdir", key)) {
            arg_appdir = value;
            continue;
        }

        std.log.err("Unknown arg: {s}", .{key});
        return ExitCode.incorrect_usage.to_u8();
    }

    const linuxdeploy = arg_linuxdeploy orelse {
        std.log.err("--linuxdeploy is required", .{});
        return ExitCode.incorrect_usage.to_u8();
    };

    const exe = arg_exe orelse {
        std.log.err("--exe is required", .{});
        return ExitCode.incorrect_usage.to_u8();
    };

    const desktop_entry = arg_desktop_entry orelse {
        std.log.err("--desktop-entry is required", .{});
        return ExitCode.incorrect_usage.to_u8();
    };

    const icon = arg_icon orelse {
        std.log.err("--icon is required", .{});
        return ExitCode.incorrect_usage.to_u8();
    };

    const appdir = arg_appdir orelse {
        std.log.err("--appdir is required", .{});
        return ExitCode.incorrect_usage.to_u8();
    };

    const out = arg_out orelse {
        std.log.err("--out is required", .{});
        return ExitCode.incorrect_usage.to_u8();
    };

    var base = try std.fs.openDirAbsolute(appdir, .{});
    defer base.close();

    // linuxdeploy tries to extract from exclude-library-stripped binary for some reason.
    // We have to manually copy beforehand otherwise nonsensial error ("Could not find dependency")
    // prevents build process.
    try base.makePath("usr/bin");
    try std.fs.copyFileAbsolute(
        exe,
        try std.fs.path.join(allocator, &.{ appdir, "usr/bin", std.fs.path.basename(exe) }),
        .{},
    );

    const cwd = std.fs.path.dirname(out) orelse {
        std.log.err("Unable to obtain cwd from output filename ({s})", .{out});
        return ExitCode.generic_error.to_u8();
    };

    const result = try std.process.Child.run(.{
        .allocator = allocator,
        .argv = &.{
            linuxdeploy,
            "--appdir",
            appdir,
            "--desktop-file",
            desktop_entry,
            "--icon-file",
            icon,
            "--output",
            "appimage",
        },
        // linuxdeploy emits to cwd and seems not to have an option to set output path.
        .cwd = cwd,
        // linuxdeploy logs a lot
        .max_output_bytes = std.math.maxInt(usize),
    });

    // linuxdeploy prints to stdout...
    std.io.getStdErr().writeAll(result.stdout) catch {};
    if (result.term.Exited != 0) {
        std.log.err("linuxdeploy exited with {d}", .{result.term.Exited});
        return ExitCode.generic_error.to_u8();
    }

    copy_appimage: {
        var dir = try std.fs.openDirAbsolute(cwd, .{ .iterate = true, .access_sub_paths = false });
        defer dir.close();

        var iter = dir.iterate();
        while (try iter.next()) |entry| {
            if (entry.kind != .file) {
                continue;
            }

            if (std.mem.endsWith(u8, entry.name, ".AppImage")) {
                try dir.rename(entry.name, std.fs.path.basename(out));
                break :copy_appimage;
            }
        }

        std.log.err("linuxdeploy exited 0, but no .AppImage file were generated", .{});
        return ExitCode.generic_error.to_u8();
    }

    return ExitCode.ok.to_u8();
}