require "./spec_helper"

describe JosieHealth::Utils::Timezone do
  describe ".resolve_alias" do
    it "resolves EST to America/New_York" do
      JosieHealth::Utils::Timezone.resolve_alias("EST").should eq("America/New_York")
    end

    it "resolves cet to Europe/Berlin (case insensitive)" do
      JosieHealth::Utils::Timezone.resolve_alias("cet").should eq("Europe/Berlin")
      JosieHealth::Utils::Timezone.resolve_alias("CET").should eq("Europe/Berlin")
    end

    it "resolves UTC" do
      JosieHealth::Utils::Timezone.resolve_alias("utc").should eq("UTC")
      JosieHealth::Utils::Timezone.resolve_alias("z").should eq("UTC")
    end

    it "resolves PST to America/Los_Angeles" do
      JosieHealth::Utils::Timezone.resolve_alias("pst").should eq("America/Los_Angeles")
    end

    it "resolves JST to Asia/Tokyo" do
      JosieHealth::Utils::Timezone.resolve_alias("jst").should eq("Asia/Tokyo")
    end

    it "returns nil for unknown alias" do
      JosieHealth::Utils::Timezone.resolve_alias("unknown").should be_nil
    end

    it "handles whitespace" do
      JosieHealth::Utils::Timezone.resolve_alias("  est  ").should eq("America/New_York")
    end
  end

  describe ".alias?" do
    it "returns true for known aliases" do
      JosieHealth::Utils::Timezone.alias?("EST").should be_true
      JosieHealth::Utils::Timezone.alias?("pst").should be_true
      JosieHealth::Utils::Timezone.alias?("UTC").should be_true
    end

    it "returns false for unknown aliases" do
      JosieHealth::Utils::Timezone.alias?("unknown").should be_false
      JosieHealth::Utils::Timezone.alias?("America/New_York").should be_false
    end
  end

  describe ".parse_offset" do
    it "parses +02:00 format" do
      result = JosieHealth::Utils::Timezone.parse_offset("+02:00")
      result.should_not be_nil
      result.not_nil![:sign].should eq("+")
      result.not_nil![:hours].should eq(2)
      result.not_nil![:minutes].should eq(0)
    end

    it "parses -05:30 format" do
      result = JosieHealth::Utils::Timezone.parse_offset("-05:30")
      result.should_not be_nil
      result.not_nil![:sign].should eq("-")
      result.not_nil![:hours].should eq(5)
      result.not_nil![:minutes].should eq(30)
    end

    it "parses +2 short format" do
      result = JosieHealth::Utils::Timezone.parse_offset("+2")
      result.should_not be_nil
      result.not_nil![:hours].should eq(2)
      result.not_nil![:minutes].should eq(0)
    end

    it "parses -530 without colon" do
      result = JosieHealth::Utils::Timezone.parse_offset("-530")
      result.should_not be_nil
      result.not_nil![:hours].should eq(5)
      result.not_nil![:minutes].should eq(30)
    end

    it "returns nil for invalid hours (>14)" do
      JosieHealth::Utils::Timezone.parse_offset("+15:00").should be_nil
    end

    it "returns nil for invalid minutes (>59)" do
      JosieHealth::Utils::Timezone.parse_offset("+02:60").should be_nil
    end

    it "returns nil for invalid format" do
      JosieHealth::Utils::Timezone.parse_offset("invalid").should be_nil
    end
  end

  describe ".format_offset" do
    it "formats positive offset" do
      JosieHealth::Utils::Timezone.format_offset("+", 2, 0).should eq("+02:00")
    end

    it "formats negative offset" do
      JosieHealth::Utils::Timezone.format_offset("-", 5, 30).should eq("-05:30")
    end

    it "pads single digit hours" do
      JosieHealth::Utils::Timezone.format_offset("+", 1, 0).should eq("+01:00")
    end
  end

  describe ".valid_iana?" do
    it "returns true for valid IANA timezone" do
      JosieHealth::Utils::Timezone.valid_iana?("America/New_York").should be_true
      JosieHealth::Utils::Timezone.valid_iana?("Europe/London").should be_true
      JosieHealth::Utils::Timezone.valid_iana?("UTC").should be_true
    end

    it "returns false for invalid timezone" do
      JosieHealth::Utils::Timezone.valid_iana?("Invalid/Zone").should be_false
      JosieHealth::Utils::Timezone.valid_iana?("NotReal/Fake").should be_false
    end
  end

  describe ".current_offset" do
    it "returns UTC offset for IANA timezone" do
      result = JosieHealth::Utils::Timezone.current_offset("UTC")
      result.should eq("UTC+00:00")
    end

    it "returns formatted offset for stored offset format" do
      result = JosieHealth::Utils::Timezone.current_offset("+02:00")
      result.should eq("UTC+02:00")
    end

    it "returns UTC for invalid timezone" do
      result = JosieHealth::Utils::Timezone.current_offset("Invalid/Zone")
      result.should eq("UTC")
    end
  end

  describe ".all_aliases" do
    it "returns array of all known aliases" do
      aliases = JosieHealth::Utils::Timezone.all_aliases
      aliases.should be_a(Array(String))
      aliases.should contain("est")
      aliases.should contain("pst")
      aliases.should contain("utc")
    end
  end
end