package edit2d

import b2 "vendor:box2d"
import im "shared:odin-imgui"
import "core:slice"
import "core:fmt"


/*
	This is mostly stable

	Handles
		1. Body Defination
		2. Shape defination
		3. Static index

	TODO: 
		Handle multiple shapes?
		Could use more tweaks on min and max values
*/


/*
	We don't need to return bool from this function because we can see the difference 
	By doing comparasion on def
*/

interface_body_def_editor :: proc(def: ^engine_entity_def)
{
	if im.BeginCombo("Body Type", fmt.ctprint(def.body_def.type)) 
	{
		for type in b2.BodyType 
		{
			if im.Selectable(fmt.ctprint(type), def.body_def.type == type) do def.body_def.type = type
		}
		im.EndCombo()
	}

	im.SliderFloat2("Position", &def.body_def.position, -50, 50)

	angle := RAD2DEG * b2.Rot_GetAngle(def.body_def.rotation)

	if im.SliderFloat("Rotation", &angle, 0, 359) 
	{
		def.body_def.rotation = b2.MakeRot(DEG2RAD * angle)
	}

	im.SliderFloat2("Linear velocity",  &def.body_def.linearVelocity,  0, 500)
	im.SliderFloat( "Angular velocity", &def.body_def.angularVelocity, 0, 500)
	im.SliderFloat( "Linear Damping",   &def.body_def.linearDamping,   0, 500)
	im.SliderFloat( "Angular Damping",  &def.body_def.angularDamping,  0, 500)
	im.SliderFloat( "Gravity Scale",    &def.body_def.gravityScale,    0, 100)
	im.Checkbox(    "Fixed rotation",   &def.body_def.fixedRotation)

	if im.InputText("Body Name", cstring(&def.name_buf[0]), 255) 
	{
		def.body_def.name = cstring(&def.name_buf[0])
	}
}

interface_edit_static_index :: proc(interface:^interface_state, def: ^engine_entity_def) -> bool
{
	
	curr_index  := &interface.curr_static_index
	entity := interface.entities[interface.selected_entity] 
	
	level   := interface.world
	
	
	if level.relations[entity.index] == nil
	{
		level.relations[entity.index] = {}
	}
	
	indexes := &level.relations[entity.index]
	
	if im.InputInt("Index Value", &def.index) do return true
	
	ret := false
	
	if def.index != 0
	{
		//For now only select from current room
		
		if im.BeginCombo("Edit Select index", fmt.ctprint(curr_index.index))
		{
			for index in level.static_indexes
			{
				if im.Selectable(fmt.ctprint(index), curr_index.index == index)
				{
					curr_index.index = index
				}
			}
			im.EndCombo()
		}
		if curr_index.index != 0
		{
			if indexes != nil
			{
				if im.Button("Add relation")
				{
					if !slice.contains(indexes[:], interface.curr_static_index)
					{
						append(indexes, interface.curr_static_index)
					}
				}
			}
		}
		
		if indexes != nil{
			for val, i in indexes
			{
				im.Text("%d", val.index)
				im.SameLine()
				if im.Button("Delete") {
					ordered_remove(indexes, i)
				}
			}
		}
	}
	return false
}


interface_shape_def_editor :: proc(def: ^engine_entity_def) -> bool 
{
	shape_def := &def.shape_def
	

	if im.BeginCombo("Shape Type", fmt.ctprint(def.shape_type)) {

		for type in b2.ShapeType 
		{
			if im.Selectable(fmt.ctprint(type), def.shape_type == type) 
			{
				def.shape_type = type
			}
		}

		im.EndCombo()
	}

	switch def.shape_type {

	case .circleShape:
		{
			im.SliderFloat("radius", &def.radius, 0, 40)
		}

	case .polygonShape:
		{
			im.SliderFloat2("Size", &def.size, -500, 500)
		}

	case .capsuleShape:
		{
			im.SliderFloat2("Center 1", &def.centers[0], -100, 100)
			im.SliderFloat2("Center 2", &def.centers[1], -100, 100)
			im.SliderFloat("Radius", &def.radius, 0, 40)
		}

	case .chainSegmentShape:
		{
			im.Checkbox("is loop", &def.is_loop)
		}

	case .segmentShape:
		{
			//TODO
		}

	}

	im.SliderFloat("Density", &def.shape_def.density, 0, 100)

	if im.Button("Flip horizontally") do flip_points(def.vertices[:], .Horizontal)
	if im.Button("Flip Vertically ") do flip_points(def.vertices[:], .Vertical)

	if im.TreeNode("Events and contacts") {
		im.Checkbox("Is sensor", &def.shape_def.isSensor)
		im.Checkbox("Enable Sensor Events", &def.shape_def.enableSensorEvents)
		im.Checkbox("Enable Contact Events", &def.shape_def.enableContactEvents)
		im.Checkbox("Enable Hit Events", &def.shape_def.enableHitEvents)
		im.Checkbox("Enable Presolve Events", &def.shape_def.enablePreSolveEvents)
		im.Checkbox("Invoke contact Creation", &def.shape_def.invokeContactCreation)
		im.Checkbox("Update body mass ", &def.shape_def.updateBodyMass)
		im.TreePop()
	}

	if im.TreeNode("Material") {
		im.Separator()

		im.SliderFloat("Friction", &def.shape_def.material.friction, 0, 1)
		im.SliderFloat("Restitution", &def.shape_def.material.restitution, 0, 1)
		im.SliderFloat("Rolling Resistance", &def.shape_def.material.rollingResistance, 0, 1)
		im.SliderFloat("Tangent Speed", &def.shape_def.material.tangentSpeed, 0, 1)
		im.InputInt("User material id", &def.shape_def.material.userMaterialId)

		//Colorpicker

		if im.TreeNode("Color") {
			color_f32 := u32_to_float4(def.shape_def.material.customColor)

			if im.ColorPicker4("Custom Color", &color_f32, {.Uint8, .InputRGB}) {
				def.shape_def.material.customColor = float4_to_u32(color_f32)
			}
			im.TreePop()
		}

		im.Separator()
		im.TreePop()
	}

	return false
}

interface_entity :: proc(interface: ^interface_state) -> bool 
{
	entity_selected := (interface.selected_entity != -1) && len(interface.entity_defs) > 0
	
	if entity_selected
	{
		def     := interface.entity_defs[interface.selected_entity]
		def_old := def^
		
		ret := false

		//interface.edit_mode = .ENTITY
		//Flags
		for flag in engine_entity_flags_enum
		{
			contains := flag in def.entity_flags
			if im.Checkbox(fmt.ctprint(flag), &contains)  do def.entity_flags ~= {flag}
		}

		im.Separator()

		if im.CollapsingHeader("Shape Edit") 
		{
			interface_shape_def_editor(def)
		}

		im.Separator()

		if im.CollapsingHeader("Body Edit") 
		{
			interface_body_def_editor(def)
		}
		
		if im.CollapsingHeader("Static Index")
		{
			ret |= interface_edit_static_index(interface, def)
		}

		if .CHAIN in def.entity_flags
		{
			im.InputInt("Body Count",           &def.body_count)
			//im.SliderFloat2("Half Link Length", &def.link_length, -10, 10)

			if im.CollapsingHeader("Chain joint def") 
			{
				interface_edit_rev_joint_minimal(&def.rev_joint)
			}
		}
		
		return !compare_engine_entity_def(def^, def_old) || ret
	}

	return false
}