#!/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

# Parse the alacritty TOML in a single awk pass, emitting one
# "<dotted-path>\t#<hex>" pair per color-valued key. Dotted keys are
# normalized (`normal.black = ...` under [colors] becomes
# colors.normal.black, same as `black = ...` under [colors.normal]),
# with the section form taking precedence and the first valid
# occurrence of a key winning.
declare -A COLORS

while IFS=$'\t' read -r key value; do
  COLORS[$key]=$value
done < <(awk '
  /^[ \t]*\[/ {
    line = $0
    sub(/^[ \t]+/, "", line)
    if (line ~ /^\[[^]]*\][ \t]*$/) {
      section = substr(line, 2, index(line, "]") - 2)
    } else {
      section = ""
    }
    next
  }

  section != "" {
    split_pos = index($0, "=")
    if (split_pos == 0) {
      next
    }

    key = substr($0, 1, split_pos - 1)
    gsub(/^[ \t]+|[ \t]+$/, "", key)
    if (key == "" || key ~ /^#/) {
      next
    }

    value = substr($0, split_pos + 1)
    gsub(/^[ \t]+|[ \t]+$/, "", value)

    # Accept a lone hex color, optionally 0x- or #-prefixed and quoted,
    # ignoring any trailing comment. The color always yields the first
    # run of six hex digits.
    if (value !~ /^["'\''](0[xX]|#)?[0-9a-fA-F]{6}(["'\'']([ \t]*#.*)?)?$/ &&
        value !~ /^(0[xX])?[0-9a-fA-F]{6}([ \t]*#.*)?$/) {
      next
    }
    match(value, /[0-9a-fA-F]{6}/)
    hex = tolower(substr(value, RSTART, RLENGTH))

    path = section "." key
    if (section == "colors" && index(key, ".") > 0) {
      if (!(path in dotted)) dotted[path] = hex
    } else {
      if (!(path in direct)) direct[path] = hex
    }
  }

  END {
    for (path in direct) print path "\t#" direct[path]
    for (path in dotted) if (!(path in direct)) print path "\t#" dotted[path]
  }
' "$ALACRITTY_FILE")

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

# Extract normal colors (color0-7)
for i in {0..7}; do
  name="${names[$i]}"
  printf -v "color$i" "%s" "${COLORS[colors.normal.$name]}"
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), falling back to normal
for i in {0..7}; do
  normal="color$i"
  name="${names[$i]}"
  val="${COLORS[colors.bright.$name]}"
  printf -v "color$((i + 8))" "%s" "${val:-${!normal}}"
done

# Extract primary and selection colors
background="${COLORS[colors.primary.background]}"
foreground="${COLORS[colors.primary.foreground]}"
selection_background="${COLORS[colors.selection.background]}"

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

mkdir -p "$THEME_SOURCE"

cat > "$COLORS_OUTPUT" <<EOF
accent = "$accent"
selection = "$selection_background"

background = "$background"
foreground = "$foreground"

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