module PaintAnalyse

# File lib/paint_analyse.rb, line 15
def analyse(theme)
  rules = Array(theme[:paint_rules])
  theme_id = theme[:id].to_s
  theme_name = theme[:name].to_s

  if rules.empty?
    return {
      theme_id: theme_id,
      theme_name: theme_name,
      findings: [{ status: :warn, detail: "no paint rules to validate" }],
      counts: { ok: 0, warn: 1, error: 0 }
    }
  end

  findings = rules.map { |rule| validate_rule(rule) }
  counts = { ok: 0, warn: 0, error: 0 }
  findings.each { |entry| counts[entry[:status]] += 1 }

  {
    theme_id: theme_id,
    theme_name: theme_name,
    findings: findings,
    counts: counts
  }
end

# File lib/paint_analyse.rb, line 79
def format_command(rule)
  colour = rule[:bg] ? "#{rule[:fg]},#{rule[:bg]}" : rule[:fg].to_s
  "!paint #{rule[:plugin]} #{rule[:line]} #{rule[:pos]} #{colour}"
end

# File lib/paint_analyse.rb, line 41
def validate_rule(rule)
  plugin = rule[:plugin].to_s
  line_number = rule[:line].to_i
  pos = rule[:pos].to_i
  fg = rule[:fg]
  bg = rule[:bg]
  base = {
    plugin: plugin,
    line: line_number,
    pos: pos,
    command: format_command(rule)
  }

  unless IrcFormat.valid_color?(fg)
    return base.merge(status: :error, detail: "invalid colour fg=#{fg}")
  end
  if bg && !IrcFormat.valid_color?(bg)
    return base.merge(status: :error, detail: "invalid colour bg=#{bg}")
  end

  lines = PaintSamples.lines(plugin)
  return base.merge(status: :error, detail: "unknown plugin — try !paint list") unless lines

  if line_number < 1 || line_number > lines.length
    return base.merge(status: :error, detail: "line out of range (1-#{lines.length})")
  end

  line_text = lines[line_number - 1]
  block = IrcPaint.block_at_plain_index(line_text, pos)
  unless block
    return base.merge(status: :error, detail: "no colour block at position #{pos}")
  end

  span = block[:text].to_s
  base.merge(status: :ok, detail: span.empty? ? "block at #{pos}" : span)
end