//! /system/drivers/display/intel-integrated - the intel 985 family display engine driver.
const std = @import("std");
const runtime = @import("runtime");
const mmio = @import("mmio");
const device = runtime.device;
const dma = runtime.dma;
const shared_memory = runtime.shared_memory;
const system = runtime.system;
const ipc = runtime.ipc;
const display_protocol = runtime.display_protocol;
const scanout_protocol = runtime.scanout_protocol;
const device_manager_protocol = @import("device-manager-protocol");
var device_id: u64 = 0;


fn initialise(endpoint: ipc.Handle) bool {
    _ = endpoint;
    return true;
}

fn onMessage(message: []const u8, reply: []u8, sender: u32, capability: ?ipc.Handle) usize {
    _ = sender;
    _ = capability;
    _ = reply;

    if (message.len < scanout_protocol.request_size) return 0;
    const request = std.mem.bytesToValue(scanout_protocol.Request, message[0..scanout_protocol.request_size]);
    switch (request.operation) {
        _ => return 0,
        // TODO:
        // @intFromEnum(sp.Operation.present) => return scanoutStatus(reply, presentFull()),
        // @intFromEnum(sp.Operation.get_modes) => {
        //     var response = sp.ModesReply{ .status = 0, .count = offered_modes.len, .modes = undefined };
        //     for (0..sp.max_modes) |i| {
        //         response.modes[i] = if (i < offered_modes.len)
        //             .{ .width = offered_modes[i].width, .height = offered_modes[i].height }
        //         else
        //             .{ .width = 0, .height = 0 };
        //     }
        //     @memcpy(reply[0..sp.modes_reply_size], std.mem.asBytes(&response));
        //     return sp.modes_reply_size;
        // },
        // @intFromEnum(sp.Operation.set_mode) => {
        //     const w = request.width;
        //     const h = request.height;
        //     if (w == 0 or h == 0 or w > max_width or h > max_height) return scanoutStatus(reply, false);
        //     current_width = w;
        //     current_height = h;
        //     return scanoutStatus(reply, setScanoutRect());
        // },
        else => return 0,
    }
    return 0;
}

pub fn main(init: runtime.process.Init) void {
    const argument = init.arguments.get(1) orelse {
        _ = system.write("display/intel-985: missing device id (argv[1])\n");
        return;
    };
    device_id = std.fmt.parseInt(u64, argument, 10) catch {
        std.log.info("malformed device id '{s}'", .{argument});
        return;
    };
    runtime.service.run(256, .{
        .service = .scanout,
        .init = initialise,
        .on_message = onMessage,
    });
}