#!/bin/sh
#
# FZF Preview Script Template
#
# This script is a template. The placeholders in curly braces, like {NAME}
#  are dynamically filled by python using .replace()

WIDTH=${FZF_PREVIEW_COLUMNS:-80} # Set a fallback width of 80
IMAGE_RENDERER="{IMAGE_RENDERER}"

generate_sha256() {
  local input

  # Check if input is passed as an argument or piped
  if [ -n "$1" ]; then
    input="$1"
  else
    input=$(cat)
  fi

  if command -v sha256sum &>/dev/null; then
    echo -n "$input" | sha256sum | awk '{print $1}'
  elif command -v shasum &>/dev/null; then
    echo -n "$input" | shasum -a 256 | awk '{print $1}'
  elif command -v sha256 &>/dev/null; then
    echo -n "$input" | sha256 | awk '{print $1}'
  elif command -v openssl &>/dev/null; then
    echo -n "$input" | openssl dgst -sha256 | awk '{print $2}'
  else
    echo -n "$input" | base64 | tr '/+' '_-' | tr -d '\n'
  fi
}

fzf_preview() {
  file=$1

  dim=${FZF_PREVIEW_COLUMNS}x${FZF_PREVIEW_LINES}
  if [ "$dim" = x ]; then
    dim=$(stty size </dev/tty | awk "{print \$2 \"x\" \$1}")
  fi
  if ! [ "$IMAGE_RENDERER" = "icat" ] && [ -z "$KITTY_WINDOW_ID" ] && [ "$((FZF_PREVIEW_TOP + FZF_PREVIEW_LINES))" -eq "$(stty size </dev/tty | awk "{print \$1}")" ]; then
    dim=${FZF_PREVIEW_COLUMNS}x$((FZF_PREVIEW_LINES - 1))
  fi

  if [ "$IMAGE_RENDERER" = "icat" ] && [ -z "$GHOSTTY_BIN_DIR" ]; then
    if command -v kitten >/dev/null 2>&1; then
      kitten icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place="$dim@0x0" "$file" | sed "\$d" | sed "$(printf "\$s/\$/\033[m/")"
    elif command -v icat >/dev/null 2>&1; then
      icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place="$dim@0x0" "$file" | sed "\$d" | sed "$(printf "\$s/\$/\033[m/")"
    else
      kitty icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place="$dim@0x0" "$file" | sed "\$d" | sed "$(printf "\$s/\$/\033[m/")"
    fi

  elif [ -n "$GHOSTTY_BIN_DIR" ]; then
    if command -v kitten >/dev/null 2>&1; then
      kitten icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place="$dim@0x0" "$file" | sed "\$d" | sed "$(printf "\$s/\$/\033[m/")"
    elif command -v icat >/dev/null 2>&1; then
      icat --clear --transfer-mode=memory --unicode-placeholder --stdin=no --place="$dim@0x0" "$file" | sed "\$d" | sed "$(printf "\$s/\$/\033[m/")"
    else
      chafa -s "$dim" "$file"
    fi
  elif command -v chafa >/dev/null 2>&1; then
    case "$PLATFORM" in
    android) chafa -s "$dim" "$file" ;;
    windows) chafa -f sixel -s "$dim" "$file" ;;
    *) chafa -s "$dim" "$file" ;;
    esac
    echo

  elif command -v imgcat >/dev/null; then
    imgcat -W "${dim%%x*}" -H "${dim##*x}" "$file"

  else
    echo please install a terminal image viewer
    echo either icat for kitty terminal and wezterm or imgcat or chafa
  fi
}


# --- Helper function for printing a key-value pair, aligning the value to the right ---
print_kv() {
    local key="$1"
    local value="$2"
    local key_len=${#key}
    local value_len=${#value}
    local multiplier="${3:-1}"

    # Correctly calculate padding by accounting for the key, the ": ", and the value.
    local padding_len=$((WIDTH - key_len - 2 - value_len * multiplier))

    # If the text is too long to fit, just add a single space for separation.
    if [ "$padding_len" -lt 1 ]; then
        padding_len=1
        value=$(echo $value| fold -s -w "$((WIDTH - key_len - 3))")
        printf "{C_KEY}%s:{RESET}%*s%s\\n" "$key" "$padding_len" "" " $value"
    else
        printf "{C_KEY}%s:{RESET}%*s%s\\n" "$key" "$padding_len" "" " $value"
    fi
}

# --- Draw a rule across the screen ---
# TODO: figure out why this method does not work in fzf
draw_rule() {
    local rule
    # Generate the line of '─' characters, removing the trailing newline `tr` adds.
    rule=$(printf '%*s' "$WIDTH" | tr ' ' '─' | tr -d '\n')
    # Print the rule with colors and a single, clean newline.
    printf "{C_RULE}%s{RESET}\\n" "$rule"
}


draw_rule(){
    ll=2
    while [ $ll -le $FZF_PREVIEW_COLUMNS ];do
        echo -n -e "{C_RULE}─{RESET}"
        ((ll++))
    done
    echo
}

# Generate the same cache key that the Python worker uses
# {PREFIX} is used only on episode previews to make sure they are unique
title={}
hash=$(generate_sha256 "{PREFIX}$title")

# 
# --- Display image if configured and the cached file exists ---
# 
if [ "{PREVIEW_MODE}" = "full" ] || [ "{PREVIEW_MODE}" = "image" ]; then
    image_file="{IMAGE_CACHE_PATH}{PATH_SEP}$hash.png"
    if [ -f "$image_file" ]; then
        fzf_preview "$image_file"
    else
        echo "🖼️  Loading image..."
    fi
    echo # Add a newline for spacing
fi
# Display text info if configured and the cached file exists
if [ "{PREVIEW_MODE}" = "full" ] || [ "{PREVIEW_MODE}" = "text" ]; then
    info_file="{INFO_CACHE_PATH}{PATH_SEP}$hash"
    if [ -f "$info_file" ]; then
        source "$info_file"
    else
        echo "📝 Loading details..."
    fi
fi