package main

import "../lib/oui"
import "core:strings"
import "core:fmt"
import rl "vendor:raylib"


Theme :: struct {
    background: rl.Color,
    background_top: rl.Color,
    background_bottom: rl.Color,
    button: rl.Color,
    text: rl.Color,
}

theme : Theme = {
    background = {20, 25, 25, 255},
    background_top = {30, 35, 35, 255},
    background_bottom = {40, 40, 40, 255},
    button = {80, 80, 80, 255},
    text = rl.RAYWHITE,
}

DAY_HEIGHT :: 35
TIMELINE_START :: 175
TIMELINE_END :: -85



Item :: oui.Item
Call :: oui.Call

Data_Element :: enum int {
    Panel,
    Button,
    Label,
    Text_Input,
    Timeblock,
// ...
}

Data_Head :: struct {
    subtype: Data_Element,
}

Data_Panel :: struct {
    using _: Data_Head,
    color: rl.Color,
}

Data_Button :: struct {
    using _: Data_Head,
    text: string,
    selected: bool,
}

Data_Label :: struct {
    using _: Data_Head,
    text: string,
    font: rl.Font,
    font_size: i32,
    alignment: Text_Alignment,
}

button_callback :: proc(ctxt: ^oui.Context, item: ^Item, event: Call) -> int {
    data := cast(^Data_Button) item.handle

    #partial switch event {
    case .Cursor_Handle:
        //return int(Cursor_Type.Hand)
    }

    return -1
}

panel :: proc(color : rl.Color = rl.RED) -> ^Item {
    item := oui.item_make(c0)

    data := oui.alloc_typed(c0, item, Data_Panel)
    data.subtype = .Panel
    data.color = color

    return item
}

panel_line :: proc(parent: ^Item, color : rl.Color, height: int = 40) -> (item: ^Item) {
    item = oui.item_make(c0)
    item.layout_cut_children = .Left
    item.layout_size.y = height

    old := parent.layout_cut_children
    parent.layout_cut_children = .Top
    oui.item_insert(parent, item)
    parent.layout_cut_children = old

    data := oui.alloc_typed(c0, item, Data_Panel)
    data.subtype = .Panel
    data.color = color

    return
}

button :: proc(text: string, width: int, selected := false) -> ^Item {
    item := oui.item_make(c0)
    item.layout_size = {width, 35}
    item.callback = button_callback

    data := oui.alloc_typed(c0, item, Data_Button)
    data.subtype = .Button
    data.text = text
    data.selected = selected

    return item
}

Text_Alignment :: enum int {
    // Techically called justification, but text_alignment is more self-explanatory.
    Left,
    Right,
    Center,
}
label :: proc(text: string, font: rl.Font, alignment: Text_Alignment = .Left) -> ^Item {
	item := oui.item_make(c0)
	
    data := oui.alloc_typed(c0, item, Data_Label)
    data.subtype = .Label
	data.text = text
    data.font = font
	data.alignment = alignment
	
	return item
}
calculate_text_alignment :: proc(text: cstring, font: rl.Font, alignment: Text_Alignment, rect: oui.RectI) -> (output: [2]int) {
    
    measurement := rl.MeasureTextEx(font, text, f32(font.baseSize), 0.0)
    
    switch alignment {
        case .Left:
            output.x = rect.l
        case .Right:
            output.x = rect.r - int(measurement.x)
        case .Center:
            output.x = (rect.l+(rect.r-rect.l)/2) - int(measurement.x/2)
    }
    
    output.y = (rect.t+(rect.b-rect.t)/2) - int(measurement.y/2)
    
    return
}
i2f :: proc "contextless" (input: [2]int) -> rl.Vector2 {
    return { f32(input.x), f32(input.y) }
}
f2i :: proc "contextless" (input: [2]f32) -> [2]int {
    return { int(input.x), int(input.y) }
}

// recursive loop
ui_draw_children :: proc(item: ^oui.Item) {
    list := oui.children_list(c0, item)
    for kid in list {
        ui_draw(kid)
    }
}

ui_draw :: proc(item: ^oui.Item) {
    head := cast(^Data_Head) item.handle
    rect := item.bounds
    
    //fmt.println(rect, head, item)

    if head == nil {
        ui_draw_children(item)
        return
    }

    #partial switch head.subtype {
    //case .Panel_Root:
        // ... render any type of item
    case .Button:
        data := cast(^Data_Button) item.handle
		rl.DrawRectangle(i32(rect.l), i32(rect.t), i32(rect.r-rect.l), i32(rect.b-rect.t), theme.button)
        
        text := strings.clone_to_cstring(data.text, context.temp_allocator)
        position := calculate_text_alignment(text, font, .Center, rect)
        
        rl.DrawTextEx(font, text, i2f(position), f32(font.baseSize), 0.0, theme.text);
        
    case .Panel:
    	data := cast(^Data_Panel) head
		rl.DrawRectangle(i32(rect.l), i32(rect.t), i32(rect.r-rect.l), i32(rect.b-rect.t), data.color)
		ui_draw_children(item)
	case .Label:
        data := cast(^Data_Label) item.handle
        text := strings.clone_to_cstring(data.text, context.temp_allocator)
        position := calculate_text_alignment(text, data.font, data.alignment, rect)

        rl.DrawTextEx(data.font, text, i2f(position), f32(data.font.baseSize), 0.0, theme.text);
    }
}