import os
from moviepy.editor import *
from PIL import Image, ImageDraw, ImageFilter, ImageFont
import numpy as np
import re
from video_editor.safe_zone import SafeZone
import uuid
from src.logger_config import logger

def get_emoji_unicode(emoji_char):
    """Convert emoji character to unicode hex string (e.g., '1f6cd')"""
    try:
        cps = [f"{ord(ch):x}" for ch in emoji_char][0]
        return cps
    except:
        return None


def load_emoji_image(emoji_char, target_height, emoji_folder="emojis"):
    """Load emoji PNG and resize it to match text height"""
    unicode_hex = get_emoji_unicode(emoji_char)
    if not unicode_hex:
        return None
    
    emoji_filename = f"emoji_u{unicode_hex}.png"
    emoji_path = os.path.join(emoji_folder, emoji_filename)
    
    if not os.path.exists(emoji_path):
        logger.warning(f"Warning: Emoji PNG not found: {emoji_path}")
        return None
    
    try:
        emoji_img = Image.open(emoji_path).convert('RGBA')
        # Resize to match text height while maintaining aspect ratio
        aspect_ratio = emoji_img.width / emoji_img.height
        new_height = target_height
        new_width = int(new_height * aspect_ratio)
        emoji_img = emoji_img.resize((new_width, new_height), Image.Resampling.LANCZOS)
        return emoji_img
    except Exception as e:
        logger.error(f"Error loading emoji {emoji_path}: {e}")
        return None


def create_cta_on_strip(
    text: str,
    video_clip: VideoClip,
    appear_at_percent: float = 0.65,
    emoji_folder: str = "emoji",
    above_caption: bool = True,
    padding: int = 20,
    show_strip: bool = False,
    bottom_safe_y: int = None
) -> CompositeVideoClip:
    """
    Overlays a full-width white strip and a dynamically sized, elevated CTA label with color emojis.
    The CTA appears at a specific percentage through the video.
    """
    # --- 1. Customize Appearance ---
    # Use text font only (no emoji font needed)
    text_font_path = 'Fonts/Ubuntu-Bold.ttf'  # Or your preferred font
    
    # Fallback to system fonts if custom fonts not found
    if not os.path.exists(text_font_path):
        logger.warning(f"Warning: '{text_font_path}' not found. Using Arial Bold.")
        text_font_path = 'arial.ttf'
    
    logger.debug(f"Using text font: {text_font_path}")
    
    text_color = (0, 0, 0)  # Black
    cta_bg_color = (255, 255, 255, 255)  # White
    strip_bg_color = (255, 255, 255, 230)  # Slightly transparent white
    corner_radius = 35
    h_padding = 50
    v_padding = 30  # Increased for more vertical space
    strip_v_padding = 50
    
    # Enhanced shadow for elevated look
    shadow_offset = (0, 10)
    shadow_color = (0, 0, 0, 80)
    shadow_blur_radius = 25

    # --- 2. Dynamic Font Sizing ---
    # Separate text from emojis for measurement
    emoji_pattern = re.compile(r'[\U0001F300-\U0001F9FF]', re.UNICODE)

    max_text_width = video_clip.w * 0.85
    font_size = int(video_clip.w * 0.12)
    font_size = min(font_size, 50)  # Cap at 200px

    # Split by newlines for multi-line support
    lines = text.split('\n')
    line_spacing = int(font_size * 0.3)  # 30% of font size for line spacing
    
    # Create font
    try:
        text_font = ImageFont.truetype(text_font_path, font_size)
    except Exception as e:
        logger.error(f"Text font loading error: {e}. Using default font.")
        text_font = ImageFont.load_default()
    
    # Measure all lines and find the widest
    max_line_width = 0
    emoji_spacing = 15  # Space between emoji and text
    
    for line in lines:
        text_only = emoji_pattern.sub('', line).strip()
        emojis_in_line = emoji_pattern.findall(line)
        
        text_upper = text_only.upper()
        try:
            text_only_length = text_font.getlength(text_upper) if text_upper else 0
        except:
            text_bbox = text_font.getbbox(text_upper) if text_upper else (0, 0, 0, 0)
            text_only_length = text_bbox[2] - text_bbox[0]
        
        # Add space for emojis (add spacing before first emoji and between elements)
        if emojis_in_line:
            total_emoji_width = len(emojis_in_line) * (font_size * 1.2 + emoji_spacing)
        else:
            total_emoji_width = 0
        line_width = text_only_length + total_emoji_width
        max_line_width = max(max_line_width, line_width)
    
    # Adjust font size if needed
    while max_line_width > max_text_width and font_size > 40:
        font_size -= 2
        line_spacing = int(font_size * 0.3)
        try:
            text_font = ImageFont.truetype(text_font_path, font_size)
        except:
            pass
        
        max_line_width = 0
        for line in lines:
            text_only = emoji_pattern.sub('', line).strip()
            emojis_in_line = emoji_pattern.findall(line)
            
            text_upper = text_only.upper()
            try:
                text_only_length = text_font.getlength(text_upper) if text_upper else 0
            except:
                text_bbox = text_font.getbbox(text_upper) if text_upper else (0, 0, 0, 0)
                text_only_length = text_bbox[2] - text_bbox[0]
            
            if emojis_in_line:
                total_emoji_width = len(emojis_in_line) * (font_size * 1.2 + emoji_spacing)
            else:
                total_emoji_width = 0
            line_width = text_only_length + total_emoji_width
            max_line_width = max(max_line_width, line_width)
    
    logger.debug(f"Final font size: {font_size}px")
    logger.debug(f"Number of lines: {len(lines)}")
    
    # --- 3. Create the Elevated CTA Label ---
    # Get accurate text metrics (for text only, without emojis)
    # Use the first line or a sample to get height
    sample_line = lines[0] if lines else "A"
    sample_text = emoji_pattern.sub('', sample_line).upper() or "A"
    text_bbox = text_font.getbbox(sample_text)
    actual_text_height = text_bbox[3] - text_bbox[1]
    text_top_offset = text_bbox[1]
    
    # Calculate total height for all lines
    total_text_height = (actual_text_height * len(lines)) + (line_spacing * (len(lines) - 1))

    base_width = int(max_line_width + (h_padding * 2))
    base_height = int(total_text_height + (v_padding * 2))
    
    # Create canvas with extra space for shadow
    canvas_size = (
        base_width + shadow_blur_radius * 3,
        base_height + shadow_blur_radius * 3
    )
    canvas = Image.new('RGBA', canvas_size, (0, 0, 0, 0))
    
    # Draw shadow
    draw = ImageDraw.Draw(canvas)
    shadow_x = shadow_blur_radius + shadow_offset[0]
    shadow_y = shadow_blur_radius + shadow_offset[1]
    shadow_box = (
        shadow_x,
        shadow_y,
        shadow_x + base_width,
        shadow_y + base_height
    )
    draw.rounded_rectangle(shadow_box, radius=corner_radius, fill=shadow_color)
    
    # Apply blur to shadow
    canvas = canvas.filter(ImageFilter.GaussianBlur(shadow_blur_radius))
    
    # Draw main white rounded rectangle
    draw = ImageDraw.Draw(canvas)
    main_x = shadow_blur_radius
    main_y = shadow_blur_radius
    main_box = (
        main_x,
        main_y,
        main_x + base_width,
        main_y + base_height
    )
    draw.rounded_rectangle(main_box, radius=corner_radius, fill=cta_bg_color)
    
    # Calculate text starting position
    text_x = main_x + h_padding
    
    # Draw text and emojis - now supporting multiple lines
    current_line_y = main_y + v_padding - text_top_offset
    
    for line in lines:
        # Split the line to preserve emoji positions
        parts = emoji_pattern.split(line)
        emojis = emoji_pattern.findall(line)
        
        current_x = text_x
        
        # Interleave text parts and emojis for this line
        for i, part in enumerate(parts):
            if part:  # Draw text part (don't strip to preserve spaces)
                part_upper = part.upper()
                draw.text(
                    (current_x, current_line_y),
                    part_upper,
                    font=text_font,
                    fill=text_color
                )
                try:
                    current_x += text_font.getlength(part_upper)
                except:
                    part_bbox = text_font.getbbox(part_upper)
                    current_x += (part_bbox[2] - part_bbox[0])
                
                # Add spacing only if there's an emoji coming next
                if i < len(emojis):
                    current_x += emoji_spacing
            
            # Draw emoji if available
            if i < len(emojis):
                emoji_img = load_emoji_image(emojis[i], int(actual_text_height) + 20, emoji_folder)
                if emoji_img:
                    # Center emoji vertically with text
                    emoji_y = current_line_y + text_top_offset + (actual_text_height - emoji_img.height) // 2
                    canvas.paste(emoji_img, (int(current_x), int(emoji_y)), emoji_img)
                    current_x += emoji_img.width + emoji_spacing
                else:
                    # If emoji image not found, skip with spacing
                    current_x += font_size + emoji_spacing
        
        # Move to next line
        current_line_y += actual_text_height + line_spacing
    
    cta_element = ImageClip(np.array(canvas))

    # --- 4. Optionally Create the Full-Width Semi-Transparent Strip ---
    if show_strip:
        strip_height = cta_element.h + (strip_v_padding * 2)
        white_strip_array = np.full(
            (strip_height, video_clip.w, 4), 
            [255, 255, 255, 230], 
            dtype=np.uint8
        )
        white_strip = ImageClip(white_strip_array)

        full_banner = CompositeVideoClip([
            white_strip,
            cta_element.set_position(('center', 'center'))
        ])
    else:
        # No strip → use only the CTA card
        full_banner = cta_element

    # --- 5. Calculate Final Position using SafeZone ---
    try:
        # _, bottom_safe_y = SafeZone.get_caption_position(
        #     video_width=video_clip.w,
        #     video_height=video_clip.h,
        #     caption_height=full_banner.h,
        #     position="bottom",
        #     padding=padding
        # )
        # Position above the safe zone bottom
        if not bottom_safe_y:
            bottom_safe_y = video_clip.h/2
        if above_caption:
            final_y_pos = bottom_safe_y
        else:
            final_y_pos = bottom_safe_y + full_banner.h
    except:
        # Fallback: position at 75% of video height
        final_y_pos = int(video_clip.h * 0.75)

    logger.debug(f"{video_clip.h}")
    logger.debug(f"{bottom_safe_y}")
    logger.debug(f"Final CTA Y position: {final_y_pos}px")
    
    final_position = ('center', final_y_pos)

    # --- 6. Set timing: appear at specified percentage ---
    start_time = video_clip.duration * appear_at_percent
    duration = video_clip.duration - start_time
    
    final_banner = (full_banner
                    .set_duration(duration)
                    .set_start(start_time)
                    .set_position(final_position))
    
    return CompositeVideoClip([video_clip, final_banner])

def add_cta(input_video_path: str, cta_text: str, above_caption: bool = True, padding: int = 20, show_strip: bool = False, bottom_safe_y: int = None) -> str:
    if above_caption:
        output_video_path = f"/tmp/{uuid.uuid4().hex[:8]}_above_caption.mp4"
    else:
        output_video_path = f"/tmp/{uuid.uuid4().hex[:8]}_below_caption.mp4"

    logger.debug(f"Loading video: '{input_video_path}'...")
    base_video = VideoFileClip(input_video_path)
    
    logger.debug(f"Generating CTA overlay with text: '{cta_text}'")
    logger.debug(f"CTA will appear at 75% mark ({base_video.duration * 0.75:.2f}s)")

    if not bottom_safe_y:
        if padding == 20:
            bottom_safe_y = 860
        else:
            bottom_safe_y = 920

    final_video = create_cta_on_strip(cta_text, base_video, above_caption = above_caption, padding=padding, show_strip=show_strip, bottom_safe_y=bottom_safe_y)

    logger.debug(f"Writing final video to '{output_video_path}'...")
    final_video.write_videofile(
        output_video_path,
        codec="libx264",
        audio_codec="aac",
        fps=25,
    )

    base_video.close()
    final_video.close()
    
    logger.debug(f"✅ Successfully created video: {output_video_path}")
    return output_video_path

# --- MAIN EXECUTION BLOCK ---
if __name__ == '__main__':
    input_video_path = "testData/output/video_no_audio_9beb42ca.mp4"
    import utils
    input_video_path = utils.ratio_1x1_to9x16(input_video_path)
    cta_text = "LINK IN BIO 🛍️"
    bottom_safe_y = 200
    add_cta(
        input_video_path,
        cta_text,
        bottom_safe_y=bottom_safe_y
    )