#!/bin/bash

# omarchy:summary=Generate a theme's colors.toml from its alacritty.toml palette
# omarchy:args=<theme-dir>
# omarchy:hidden=true

set -e

THEME_SOURCE="${1:-}"
COLORS_OUTPUT="$THEME_SOURCE/colors.toml"
ALACRITTY_FILE="$THEME_SOURCE/alacritty.toml"

if [[ -z $THEME_SOURCE ]]; then
  echo "Usage: omarchy-theme-colors-from-alacritty <theme-dir>" >&2
  exit 1
fi

# Skip if colors.toml already exists in source theme
if [[ -f $COLORS_OUTPUT ]]; then
  exit 0
fi

# Skip if no alacritty.toml to extract from
if [[ ! -f $ALACRITTY_FILE ]]; then
  exit 0
fi

normalize_hex() {
  local color="$1"
  [[ -z $color ]] && return
  color="${color#0x}"
  color="${color#\#}"
  if [[ $color =~ ^[0-9a-fA-F]{6}$ ]]; then
    printf "#%s\n" "${color,,}"
  fi
}

extract_color_in_section() {
  local section="$1"
  local key="$2"
  local color_hex=""
  color_hex=$(awk -v section="$section" -v key="$key" '
    function trim(value) {
      gsub(/^[ \t]+|[ \t]+$/, "", value)
      return value
    }

    function strip_comment(value,    i, ch, out, in_single, in_double, prev) {
      out = ""
      in_single = 0
      in_double = 0
      prev = ""

      for (i = 1; i <= length(value); i++) {
        ch = substr(value, i, 1)

        if (ch == "\"" && !in_single && prev != "\\") {
          in_double = !in_double
        } else if (ch == "'\''" && !in_double) {
          in_single = !in_single
        }

        if (ch == "#" && !in_single && !in_double) {
          break
        }

        out = out ch
        prev = ch
      }

      gsub(/[ \t]+$/, "", out)
      return out
    }

    /^[ \t]*\[/ {
      in_section = ($0 ~ "^[ \\t]*\\[" section "\\][ \\t]*$")
      next
    }

    in_section {
      line = $0
      line = strip_comment(line)

      split_pos = index(line, "=")
      if (split_pos == 0) {
        next
      }

      current_key = trim(substr(line, 1, split_pos - 1))
      current_value = trim(substr(line, split_pos + 1))

      if (current_key == key) {
        gsub(/["'\''#]/, "", current_value)
        sub(/^0[xX]/, "", current_value)
        if (current_value ~ /^[0-9A-Fa-f]{6}$/) {
          print current_value
          exit
        }
      }
    }
  ' "$ALACRITTY_FILE")

  if [[ -n $color_hex && $color_hex =~ ^[0-9a-fA-F]{6}$ ]]; then
    normalize_hex "$color_hex"
  fi

  return 0
}

names=(black red green yellow blue magenta cyan white)

# Extract normal colors (color0-7)
for i in {0..7}; do
  name="${names[$i]}"
  val=$(extract_color_in_section "colors.normal" "$name")
  if [[ -z $val ]]; then
    val=$(extract_color_in_section "colors" "normal.$name")
  fi

  printf -v "color$i" "%s" "$val"
done

# Validate we have all normal colors (required)
for c in color0 color1 color2 color3 color4 color5 color6 color7; do
  if [[ -z ${!c} ]]; then
    echo "Warning: Cannot extract all normal colors from $ALACRITTY_FILE, skipping generation" >&2
    exit 0
  fi
done

# Extract bright colors (color8-15)
for i in {0..7}; do
  normal="color$i"
  bright="color$((i + 8))"
  name="${names[$i]}"

  val=$(extract_color_in_section "colors.bright" "$name")
  if [[ -z $val ]]; then
    val=$(extract_color_in_section "colors" "bright.$name")
  fi

  printf -v "$bright" "%s" "${val:-${!normal}}"
done

# Extract primary colors
background=$(extract_color_in_section "colors.primary" "background")
foreground=$(extract_color_in_section "colors.primary" "foreground")

if [[ -z $background ]]; then
  background=$(extract_color_in_section "colors" "primary.background")
fi

if [[ -z $foreground ]]; then
  foreground=$(extract_color_in_section "colors" "primary.foreground")
fi

# Extract cursor color (from [colors.cursor] section)
cursor=$(extract_color_in_section "colors.cursor" "cursor")

if [[ -z $cursor ]]; then
  cursor=$(extract_color_in_section "colors" "cursor.cursor")
fi

# Extract selection colors
selection_background=$(extract_color_in_section "colors.selection" "background")

if [[ -z $selection_background ]]; then
  selection_background=$(extract_color_in_section "colors" "selection.background")
fi

selection_foreground=$(extract_color_in_section "colors.selection" "text")

if [[ -z $selection_foreground ]]; then
  selection_foreground=$(extract_color_in_section "colors" "selection.text")
fi

# Apply defaults
background=${background:-$color0}
foreground=${foreground:-$color7}
cursor=${cursor:-$foreground}
selection_background=${selection_background:-$foreground}
selection_foreground=${selection_foreground:-$background}
accent=$color4

mkdir -p "$THEME_SOURCE"

cat > "$COLORS_OUTPUT" <<EOF
accent = "$accent"
cursor = "$cursor"
foreground = "$foreground"
background = "$background"
selection_foreground = "$selection_foreground"
selection_background = "$selection_background"

color0 = "$color0"
color1 = "$color1"
color2 = "$color2"
color3 = "$color3"
color4 = "$color4"
color5 = "$color5"
color6 = "$color6"
color7 = "$color7"
color8 = "$color8"
color9 = "$color9"
color10 = "$color10"
color11 = "$color11"
color12 = "$color12"
color13 = "$color13"
color14 = "$color14"
color15 = "$color15"
EOF