// anims demo: input, mesh, anim, render, fx, ui, instancing
// - rlyeh, public domain.
//
// Compile with:
//    `make     demos\03-anims.c` (windows)
// `sh MAKE.bat demos/03-anims.c` (linux, osx)
//
// @todo: instanced poses, instanced render_bones
// @todo: ik, modify bone transform (bone space)

#include "v4k.h"

int main() {
    bool do_showaabb = 0;
    bool do_showbones = 0;
    bool do_showmodel = 1;
    bool do_showgizmo = 1;

    // 75% sized, MSAAx2
    window_create(75, WINDOW_MSAA2);
    window_title(__FILE__);

    camera_t cam = camera();
    skybox_t sky = skybox("cubemaps/stardust", 0);
    model_t  mdl = model("Stan.fbx", 0);
    anims_t    a = animations("Stan.anim", 0);



    // load all postfx files in all subdirs
    fx_load("fx**.fs");

    while( window_swap() && !input(KEY_ESC) ) {
        // fps camera
        if( input(GAMEPAD_CONNECTED) ) {
            vec2 filtered_lpad = input_filter_deadzone(input2(GAMEPAD_LPAD), 0.15f/*do_gamepad_deadzone*/ + 1e-3 );
            vec2 filtered_rpad = input_filter_deadzone(input2(GAMEPAD_RPAD), 0.15f/*do_gamepad_deadzone*/ + 1e-3 );
            vec2 mouse = scale2(vec2(filtered_rpad.x, filtered_rpad.y), 1.0f);
            vec3 wasdec = scale3(vec3(filtered_lpad.x, input(GAMEPAD_LT) - input(GAMEPAD_RT), filtered_lpad.y), 1.0f);
            camera_move(&cam, wasdec.x,wasdec.y,wasdec.z);
            camera_fps(&cam, mouse.x,mouse.y);
            window_cursor( true );
        } else {
            bool active = ui_active() || ui_hover() || gizmo_active() ? false : input(MOUSE_L) || input(MOUSE_M) || input(MOUSE_R);
            if( active ) cam.speed = clampf(cam.speed + input_diff(MOUSE_W) / 10, 0.05f, 5.0f);
            vec2 mouse = scale2(vec2(input_diff(MOUSE_X), -input_diff(MOUSE_Y)), 0.2f * active);
            vec3 wasdecq = scale3(vec3(input(KEY_D)-input(KEY_A),input(KEY_E)-(input(KEY_C)||input(KEY_Q)),input(KEY_W)-input(KEY_S)), cam.speed);
            camera_move(&cam, wasdecq.x,wasdecq.y,wasdecq.z);
            camera_fps(&cam, mouse.x,mouse.y);
            window_cursor( !active );
        }

        // skeletal update
        static bool is_dragging_slider = 0;
        vec2i anim = vec2i( a.anims[ a.inuse ].from, a.anims[ a.inuse ].to );
        profile("Skeletal update") {
            float delta = window_delta() * 30 * a.speed * !is_dragging_slider; // 30fps anim timer
            if(!window_has_pause()) mdl.curframe = model_animate_clip(mdl, mdl.curframe + delta, anim.min, anim.max, a.anims[a.inuse].flags & ANIM_LOOP );
        }

        // render
        fx_begin();

            // Skybox
            profile("Skybox") {
                skybox_render(&sky, cam.proj, cam.view);
            }

            // ground
            ddraw_ground(0);
            ddraw_flush();

            // characters
            static int NUM_INSTANCES = 1;
            profile("Skeletal render") {
                if( do_showmodel ) model_render_instanced(mdl, cam.proj, cam.view, a.M, 0, NUM_INSTANCES);

                if( do_showbones ) model_render_skeleton(mdl, a.M[0]);

                if( do_showaabb ) {
                    aabb box = model_aabb(mdl, a.M[0]);
                    ddraw_aabb(box.min, box.max);
                }

                if( do_showgizmo ) {
                    static vec3 p = {0,0,0}, r = {0,-90,0}, s = {1,1,1};
                    gizmo(&p, &r, &s);
                    compose44(a.M[0], p, eulerq(r), s);
                }
            }

        fx_end();

        if( ui_panel("Animation", 0) ) {
            if( ui_bool("Show aabb", &do_showaabb) );
            if( ui_bool("Show bones", &do_showbones) );
            if( ui_bool("Show models", &do_showmodel) );
            if( ui_bool("Show gizmo", &do_showgizmo) );
            ui_separator();

            if( ui_int("Instances", &NUM_INSTANCES)) NUM_INSTANCES = clampi(NUM_INSTANCES, 1, array_count(a.M));
            ui_separator();

            ui_label(va("Anim %s [%d.. %.2f ..%d]", a.anims[ a.inuse ].name, anim.min, mdl.curframe, anim.max ));

            // normalize curframe into [0..1] range
            is_dragging_slider = 0;
            float range = (mdl.curframe - anim.min) / ((anim.max - anim.min) + !(anim.max - anim.min));
            if( ui_slider2("Frame", &range, va("%.2f/%d %02d%%", mdl.curframe - anim.min, anim.max - anim.min, (int)(range * 100.f))) ) {
                mdl.curframe = range * (anim.max - anim.min) + anim.min;
                is_dragging_slider = 1;
            }

            ui_slider2("Speed", &a.speed, va("x%.2f", a.speed));
            ui_separator();

            for( int i = 0; i < array_count(a.anims); ++i ) {
                bool selected = a.inuse == i;
                float progress = selected ? (mdl.curframe - anim.min) * 100.f / (anim.max - anim.min) : 0.f;
                const char *caption = va("%s%s%s %.2f%%", selected ? "*":"", a.anims[i].name, a.anims[i].flags & ANIM_LOOP ? " (Loop)":"", progress);
                int choice = ui_label2_toolbar(caption, va("%s %s %s", ICON_MD_REPLAY_CIRCLE_FILLED, a.inuse == i && a.speed <= 0 ? ICON_MD_NOT_STARTED : ICON_MD_PAUSE_CIRCLE, ICON_MD_PLAY_CIRCLE) );
                if( choice == 1 ) { // play/restart
                    if( mdl.curframe >= anim.max ) mdl.curframe = anim.min; // restart animation
                    a.speed = 1.0f;
                    a.inuse = i;
                }
                if( choice == 2 ) {  // pause/advance-frame
                    if(a.speed <= 0) mdl.curframe = (int)mdl.curframe + 1;
                    a.speed = 0.0f;
                    a.inuse = i;
                }
                if( choice == 3 ) { // loop on/off
                    if( a.anims[i].flags & ANIM_LOOP )
                    a.anims[ i ].flags &= ~ANIM_LOOP;
                    else
                    a.anims[ i ].flags |= ANIM_LOOP;
                    a.inuse = i;
                }
            }
            ui_panel_end();
        }
        if( ui_panel("FX", 0) ) {
            for( int i = 0; i < 64; ++i ) {
                char *name = fx_name(i); if( !name ) break;
                bool b = fx_enabled(i);
                if( ui_bool(name, &b) ) fx_enable(i, b);
            }
            ui_panel_end();
        }
    }
}

// @todo: controller demo: root motion on/off
// @todo: controller demo: anim controller.lua

// this demo supersedes following old sources:
// https://github.com/r-lyeh/V4K/blob/45e34d7890b2b8fe1f4994f4b76e496280d83cb6/demos/00-anims.c
// https://github.com/r-lyeh/V4K/blob/45e34d7890b2b8fe1f4994f4b76e496280d83cb6/demos/00-instanced.c