package rl

/*
#include "raylib.h"
#include <stdlib.h>
*/
import "C"
import (
	"image/color"
	"unsafe"
)

// cptr returns C pointer
func (c *GlyphInfo) cptr() *C.GlyphInfo {
	return (*C.GlyphInfo)(unsafe.Pointer(c))
}

// cptr returns C pointer
func (s *Font) cptr() *C.Font {
	return (*C.Font)(unsafe.Pointer(s))
}

// GetFontDefault - Get the default Font
func GetFontDefault() Font {
	ret := C.GetFontDefault()
	v := newFontFromPointer(unsafe.Pointer(&ret))
	return v
}

// LoadFont - Load a Font image into GPU memory (VRAM)
func LoadFont(fileName string) Font {
	cfileName := C.CString(fileName)
	defer C.free(unsafe.Pointer(cfileName))
	ret := C.LoadFont(cfileName)
	v := newFontFromPointer(unsafe.Pointer(&ret))
	return v
}

// LoadFontEx - Load Font from file with extended parameters
func LoadFontEx(fileName string, fontSize int32, fontChars []rune) Font {
	var cfontChars *C.int
	var ccharsCount C.int

	cfileName := C.CString(fileName)
	defer C.free(unsafe.Pointer(cfileName))
	cfontSize := (C.int)(fontSize)
	if fontChars != nil {
		cfontChars = (*C.int)(unsafe.Pointer(&fontChars[0]))
		ccharsCount = (C.int)(len(fontChars))
	}
	ret := C.LoadFontEx(cfileName, cfontSize, cfontChars, ccharsCount)
	v := newFontFromPointer(unsafe.Pointer(&ret))
	return v
}

// LoadFontFromImage - Loads an Image font file (XNA style)
func LoadFontFromImage(image Image, key color.RGBA, firstChar int32) Font {
	cimage := image.cptr()
	ckey := colorCptr(key)
	cfirstChar := (C.int)(firstChar)
	ret := C.LoadFontFromImage(*cimage, *ckey, cfirstChar)
	v := newFontFromPointer(unsafe.Pointer(&ret))
	return v
}

// LoadFontFromMemory - Load font from memory buffer, fileType refers to extension: i.e. ".ttf"
func LoadFontFromMemory(fileType string, fileData []byte, dataSize int32, fontSize int32, fontChars *int32, charsCount int32) Font {
	cfileType := C.CString(fileType)
	defer C.free(unsafe.Pointer(cfileType))
	cfileData := (*C.uchar)(unsafe.Pointer(&fileData[0]))
	cdataSize := (C.int)(dataSize)
	cfontSize := (C.int)(fontSize)
	cfontChars := (*C.int)(unsafe.Pointer(fontChars))
	ccharsCount := (C.int)(charsCount)
	ret := C.LoadFontFromMemory(cfileType, cfileData, cdataSize, cfontSize, cfontChars, ccharsCount)
	v := newFontFromPointer(unsafe.Pointer(&ret))
	return v
}

// LoadFontData - Load font data for further use
func LoadFontData(fileData []byte, dataSize int32, fontSize int32, fontChars *int32, charsCount, typ int32) *GlyphInfo {
	cfileData := (*C.uchar)(unsafe.Pointer(&fileData[0]))
	cdataSize := (C.int)(dataSize)
	cfontSize := (C.int)(fontSize)
	cfontChars := (*C.int)(unsafe.Pointer(fontChars))
	ccharsCount := (C.int)(charsCount)
	ctype := (C.int)(typ)
	ret := C.LoadFontData(cfileData, cdataSize, cfontSize, cfontChars, ccharsCount, ctype)
	v := newGlyphInfoFromPointer(unsafe.Pointer(&ret))
	return &v
}

// UnloadFont - Unload Font from GPU memory (VRAM)
func UnloadFont(font Font) {
	cfont := font.cptr()
	C.UnloadFont(*cfont)
}

// DrawText - Draw text (using default font)
func DrawText(text string, posX int32, posY int32, fontSize int32, col color.RGBA) {
	ctext := C.CString(text)
	defer C.free(unsafe.Pointer(ctext))
	cposX := (C.int)(posX)
	cposY := (C.int)(posY)
	cfontSize := (C.int)(fontSize)
	ccolor := colorCptr(col)
	C.DrawText(ctext, cposX, cposY, cfontSize, *ccolor)
}

// DrawTextEx - Draw text using Font and additional parameters
func DrawTextEx(font Font, text string, position Vector2, fontSize float32, spacing float32, tint color.RGBA) {
	cfont := font.cptr()
	ctext := C.CString(text)
	defer C.free(unsafe.Pointer(ctext))
	cposition := position.cptr()
	cfontSize := (C.float)(fontSize)
	cspacing := (C.float)(spacing)
	ctint := colorCptr(tint)
	C.DrawTextEx(*cfont, ctext, *cposition, cfontSize, cspacing, *ctint)
}

// MeasureText - Measure string width for default font
func MeasureText(text string, fontSize int32) int32 {
	ctext := C.CString(text)
	defer C.free(unsafe.Pointer(ctext))
	cfontSize := (C.int)(fontSize)
	ret := C.MeasureText(ctext, cfontSize)
	v := (int32)(ret)
	return v
}

// MeasureTextEx - Measure string size for Font
func MeasureTextEx(font Font, text string, fontSize float32, spacing float32) Vector2 {
	cfont := font.cptr()
	ctext := C.CString(text)
	defer C.free(unsafe.Pointer(ctext))
	cfontSize := (C.float)(fontSize)
	cspacing := (C.float)(spacing)
	ret := C.MeasureTextEx(*cfont, ctext, cfontSize, cspacing)
	v := newVector2FromPointer(unsafe.Pointer(&ret))
	return v
}

// GetGlyphIndex - Get glyph index position in font for a codepoint (unicode character), fallback to '?' if not found
func GetGlyphIndex(font Font, codepoint int32) int32 {
	cfont := font.cptr()
	ccodepoint := (C.int)(codepoint)
	ret := C.GetGlyphIndex(*cfont, ccodepoint)
	v := (int32)(ret)
	return v
}

// GetGlyphInfo - Get glyph font info data for a codepoint (unicode character), fallback to '?' if not found
func GetGlyphInfo(font Font, codepoint int32) GlyphInfo {
	cfont := font.cptr()
	ccodepoint := (C.int)(codepoint)
	ret := C.GetGlyphInfo(*cfont, ccodepoint)
	v := newGlyphInfoFromPointer(unsafe.Pointer(&ret))
	return v
}

// GetGlyphAtlasRec - Get glyph rectangle in font atlas for a codepoint (unicode character), fallback to '?' if not found
func GetGlyphAtlasRec(font Font, codepoint int32) Rectangle {
	cfont := font.cptr()
	ccodepoint := (C.int)(codepoint)
	ret := C.GetGlyphAtlasRec(*cfont, ccodepoint)
	v := newRectangleFromPointer(unsafe.Pointer(&ret))
	return v
}

// DrawFPS - Shows current FPS
func DrawFPS(posX int32, posY int32) {
	cposX := (C.int)(posX)
	cposY := (C.int)(posY)
	C.DrawFPS(cposX, cposY)
}