// Reimplementations of the following tests from Flecs:
// https://github.com/SanderMertens/flecs/blob/master/test/api/src/World.c

const std = @import("std");
const expect = std.testing.expect;
const expectEql = std.testing.expectEqual;
const expectStrEql = std.testing.expectEqualStrings;

const util = @import("./util.zig");

const flecs = @import("../src/main.zig");
const c = flecs.c;

const context = flecs.Context(void);
const Lookup = context.Lookup;
const World = context.World;
const Iter = context.Iter;
const Entity = context.Entity;

const Position = struct { x: f32, y: f32 };
const Velocity = struct { x: f32, y: f32 };

fn move(it: *Iter) void {
    var pos = it.field(Position, 1);
    var vel = it.field(Velocity, 2);
    util.Probe.probeIter(it);

    for (0..it.count) |row| {
        var p = &pos[row];
        var v = &vel[row];
        p.*.x += v.*.x * it.delta_time;
        p.*.y += v.*.y * it.delta_time;
    }
}

test "World_progress_w_0" {
    var world = try World.init(std.testing.allocator);
    defer world.deinit();

    _ = world.component(Position);
    _ = world.component(Velocity);

    // const e1 = world.entity(&.{ Position, Velocity });

    // // const phase = Entity.fromRaw(world, c.EcsOnUpdate);
    // // const move_system = world.system("move", move, phase, "Position, Velocity");

    // var ctx = util.Probe.init();
    // c.ecs_set_context(world.raw, &ctx);

    // // e1.set(Position, .{ 0, 0 });
    // // e1.set(Velocity, .{ 1, 2 });

    // _ = world.progress(0);

    // try expectEql(ctx.count, 1);
    // try expectEql(ctx.invoked, 1);
    // // try expectEql(ctx.system, move_system);
    // try expectEql(ctx.termCount, 2);
    // try expectEql(ctx.param, null);

    // try expectEql(ctx.e[0], e1.raw);
    // try expectEql(ctx.c[0][0], Lookup(Position).id);
    // try expectEql(ctx.c[0][1], Lookup(Velocity).id);
    // try expectEql(ctx.s[0][0], 0);
    // try expectEql(ctx.s[0][1], 0);

    // // const p = try e1.get(Position);
    // // try expect(p.x != 0);
    // // try expect(p.y != 0);
}