// widgetTextInput.c — TextInput and TextArea widgets

#include "widgetInternal.h"


// ============================================================
// wgtTextArea
// ============================================================

WidgetT *wgtTextArea(WidgetT *parent, int32_t maxLen) {
    WidgetT *w = widgetAlloc(parent, WidgetTextAreaE);

    if (w) {
        int32_t bufSize = maxLen > 0 ? maxLen + 1 : 256;
        w->as.textArea.buf     = (char *)malloc(bufSize);
        w->as.textArea.bufSize = bufSize;

        if (w->as.textArea.buf) {
            w->as.textArea.buf[0] = '\0';
        }
    }

    return w;
}


// ============================================================
// wgtTextInput
// ============================================================

WidgetT *wgtTextInput(WidgetT *parent, int32_t maxLen) {
    WidgetT *w = widgetAlloc(parent, WidgetTextInputE);

    if (w) {
        int32_t bufSize = maxLen > 0 ? maxLen + 1 : 256;
        w->as.textInput.buf     = (char *)malloc(bufSize);
        w->as.textInput.bufSize = bufSize;

        if (w->as.textInput.buf) {
            w->as.textInput.buf[0] = '\0';
        }

        w->weight = 100;  // text inputs stretch by default
    }

    return w;
}


// ============================================================
// widgetTextInputCalcMinSize
// ============================================================

void widgetTextInputCalcMinSize(WidgetT *w, const BitmapFontT *font) {
    w->calcMinW = font->charWidth * 8 + TEXT_INPUT_PAD * 2;
    w->calcMinH = font->charHeight + TEXT_INPUT_PAD * 2;
}


// ============================================================
// widgetTextInputOnMouse
// ============================================================

void widgetTextInputOnMouse(WidgetT *hit, WidgetT *root, int32_t vx) {
    hit->focused = true;

    // Place cursor at click position
    AppContextT *ctx = (AppContextT *)root->userData;
    const BitmapFontT *font = &ctx->font;
    int32_t relX    = vx - hit->x - TEXT_INPUT_PAD;
    int32_t charPos = relX / font->charWidth + hit->as.textInput.scrollOff;

    if (charPos < 0) {
        charPos = 0;
    }

    if (charPos > hit->as.textInput.len) {
        charPos = hit->as.textInput.len;
    }

    hit->as.textInput.cursorPos = charPos;
}


// ============================================================
// widgetTextInputPaint
// ============================================================

void widgetTextInputPaint(WidgetT *w, DisplayT *d, const BlitOpsT *ops, const BitmapFontT *font, const ColorSchemeT *colors) {
    uint32_t fg = w->fgColor ? w->fgColor : colors->contentFg;
    uint32_t bg = w->bgColor ? w->bgColor : colors->contentBg;

    // Sunken border
    BevelStyleT bevel;
    bevel.highlight = colors->windowShadow;
    bevel.shadow    = colors->windowHighlight;
    bevel.face      = bg;
    bevel.width     = 2;
    drawBevel(d, ops, w->x, w->y, w->w, w->h, &bevel);

    // Draw text
    if (w->as.textInput.buf) {
        int32_t textX    = w->x + TEXT_INPUT_PAD;
        int32_t textY    = w->y + (w->h - font->charHeight) / 2;
        int32_t maxChars = (w->w - TEXT_INPUT_PAD * 2) / font->charWidth;
        int32_t off      = w->as.textInput.scrollOff;
        int32_t len      = w->as.textInput.len - off;

        if (len > maxChars) {
            len = maxChars;
        }

        for (int32_t i = 0; i < len; i++) {
            drawChar(d, ops, font, textX + i * font->charWidth, textY,
                     w->as.textInput.buf[off + i],
                     fg, bg, true);
        }

        // Draw cursor
        if (w->focused) {
            int32_t cursorX = textX + (w->as.textInput.cursorPos - off) * font->charWidth;

            if (cursorX >= w->x + TEXT_INPUT_PAD &&
                cursorX < w->x + w->w - TEXT_INPUT_PAD) {
                drawVLine(d, ops, cursorX, textY, font->charHeight, fg);
            }
        }
    }
}