const std = @import("std");
const zterm = @import("zterm");

const App = zterm.App(
    union(enum) {},
    zterm.Renderer.Direct,
    true,
);
const Key = zterm.Key;
const Layout = App.Layout;
const Widget = App.Widget;

const log = std.log.scoped(.default);

pub fn main() !void {
    errdefer |err| log.err("Application Error: {any}", .{err});

    var gpa: std.heap.GeneralPurposeAllocator(.{}) = .{};
    defer {
        const deinit_status = gpa.deinit();
        // fail test; can't try in defer as defer is executed after we return
        if (deinit_status == .leak) {
            log.err("memory leak", .{});
        }
    }
    const allocator = gpa.allocator();

    var app: App = .{};
    var renderer = App.Renderer.init(allocator);
    defer renderer.deinit();
    // FIX: when not running fullscreen, the application needs to screen down accordingly to display the contents
    // -> size hint how much should it use?

    // var layout = Layout.createFrom(layout: {
    //     var stack = Layout.HStack.init(allocator, .{
    //         Widget.createFrom(blk: {
    //             var spacer = Widget.Spacer.init();
    //             break :blk &spacer;
    //         }),
    //         Widget.createFrom(blk: {
    //             const file = try std.fs.cwd().openFile("./src/app.zig", .{});
    //             defer file.close();
    //             var widget = Widget.RawText.init(allocator, file);
    //             break :blk &widget;
    //         }),
    //         Widget.createFrom(blk: {
    //             var spacer = Widget.Spacer.init();
    //             break :blk &spacer;
    //         }),
    //     });
    //     break :layout &stack;
    // });
    var layout = Layout.createFrom(layout: {
        var hstack = Layout.HStack.init(allocator, .{
            Widget.createFrom(blk: {
                var spacer = Widget.Spacer.init();
                break :blk &spacer;
            }),
            Layout.createFrom(framing: {
                var framing = Layout.Framing.init(
                    allocator,
                    .{
                        .style = .{
                            .fg = .{
                                .index = 6,
                            },
                        },
                        .frame = .round,
                        .title = .{
                            .str = "VStack",
                            .style = .{
                                .ul_style = .single,
                                .ul = .{ .index = 6 },
                                .bold = true,
                            },
                        },
                    },
                    .{
                        .layout = Layout.createFrom(
                            padding: {
                                var padding = Layout.Padding.init(
                                    allocator,
                                    .{
                                        .padding = 3,
                                    },
                                    .{
                                        .layout = Layout.createFrom(vstack: {
                                            var vstack = Layout.VStack.init(allocator, .{
                                                Widget.createFrom(blk: {
                                                    const file = try std.fs.cwd().openFile("./src/app.zig", .{});
                                                    defer file.close();
                                                    var widget = Widget.RawText.init(allocator, file);
                                                    break :blk &widget;
                                                }),
                                                Widget.createFrom(blk: {
                                                    var spacer = Widget.Spacer.init();
                                                    break :blk &spacer;
                                                }),
                                                Widget.createFrom(blk: {
                                                    const file = try std.fs.cwd().openFile("./src/main.zig", .{});
                                                    defer file.close();
                                                    var widget = Widget.RawText.init(allocator, file);
                                                    break :blk &widget;
                                                }),
                                            });
                                            break :vstack &vstack;
                                        }),
                                    },
                                );
                                break :padding &padding;
                            },
                        ),
                    },
                );
                break :framing &framing;
            }),
            Widget.createFrom(blk: {
                var spacer = Widget.Spacer.init();
                break :blk &spacer;
            }),
        });
        break :layout &hstack;
    });
    defer layout.deinit();

    try app.start();
    defer app.stop() catch unreachable;

    // App.Event loop
    while (true) {
        const event = app.nextEvent();
        log.debug("received event: {s}", .{@tagName(event)});

        switch (event) {
            .quit => break,
            .resize => |size| {
                renderer.resize(size);
            },
            .key => |key| {
                // ctrl+c to quit
                if (Key.matches(key, .{ .cp = 'c', .mod = .{ .ctrl = true } })) {
                    app.quit();
                }
                if (Key.matches(key, .{ .cp = 'n', .mod = .{ .ctrl = true } })) {
                    try app.interrupt();
                    defer app.start() catch @panic("could not start app event loop");
                    var child = std.process.Child.init(&.{"hx"}, allocator);
                    _ = child.spawnAndWait() catch |err| {
                        app.postEvent(.{
                            .err = .{
                                .err = err,
                                .msg = "Spawning Helix failed",
                            },
                        });
                    };
                }
            },
            .err => |err| {
                log.err("Received {any} with message: {s}", .{ err.err, err.msg });
            },
        }
        // NOTE: this currently re-renders the screen for every key-press -> which might be a bit of an overkill
        const events = try layout.handle(event);
        for (events.items) |e| {
            app.postEvent(e);
        }
        try layout.render(&renderer);
        try renderer.flush();
    }
}