require "./spec_helper"

describe JosieHealth::Utils::Timestamp do
  describe ".parse_ago" do
    it "parses HHMM format (0130 = 1h30m ago)" do
      result = JosieHealth::Utils::Timestamp.parse_ago("0130")
      result.should_not be_nil
      diff = Time.utc - result.not_nil!
      diff.total_minutes.should be_close(90, 1)
    end

    it "parses HMM format (230 = 2h30m ago)" do
      result = JosieHealth::Utils::Timestamp.parse_ago("230")
      result.should_not be_nil
      diff = Time.utc - result.not_nil!
      diff.total_minutes.should be_close(150, 1)
    end

    it "parses MM format (30 = 30m ago)" do
      result = JosieHealth::Utils::Timestamp.parse_ago("30")
      result.should_not be_nil
      diff = Time.utc - result.not_nil!
      diff.total_minutes.should be_close(30, 1)
    end

    it "parses 0000 as current time" do
      result = JosieHealth::Utils::Timestamp.parse_ago("0000")
      result.should_not be_nil
      diff = Time.utc - result.not_nil!
      diff.total_seconds.should be_close(0, 2)
    end

    it "returns nil for invalid hours (25)" do
      JosieHealth::Utils::Timestamp.parse_ago("2530").should be_nil
    end

    it "returns nil for invalid minutes (99)" do
      JosieHealth::Utils::Timestamp.parse_ago("1299").should be_nil
    end

    it "returns nil for non-numeric input" do
      JosieHealth::Utils::Timestamp.parse_ago("abc").should be_nil
    end
  end

  describe ".parse_ago_rfc3339" do
    it "returns RFC3339 formatted string" do
      result = JosieHealth::Utils::Timestamp.parse_ago_rfc3339("0100")
      result.should match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/)
    end

    it "returns current time for invalid input" do
      result = JosieHealth::Utils::Timestamp.parse_ago_rfc3339("invalid")
      time = Time.parse_rfc3339(result)
      diff = Time.utc - time
      diff.total_seconds.abs.should be < 2
    end
  end

  describe ".parse_timestamp" do
    it "parses full ISO format with seconds" do
      result = JosieHealth::Utils::Timestamp.parse_timestamp("2025-01-15T14:30:45")
      result.should_not be_nil
      time = Time.parse_rfc3339(result.not_nil!)
      time.year.should eq(2025)
      time.month.should eq(1)
      time.day.should eq(15)
      time.hour.should eq(14)
      time.minute.should eq(30)
      time.second.should eq(45)
    end

    it "parses full ISO format without seconds" do
      result = JosieHealth::Utils::Timestamp.parse_timestamp("2025-01-15T14:30")
      result.should_not be_nil
      time = Time.parse_rfc3339(result.not_nil!)
      time.hour.should eq(14)
      time.minute.should eq(30)
      time.second.should eq(0)
    end

    it "parses HH:MM format (today)" do
      result = JosieHealth::Utils::Timestamp.parse_timestamp("14:30")
      result.should_not be_nil
      time = Time.parse_rfc3339(result.not_nil!)
      now = Time.utc
      time.year.should eq(now.year)
      time.month.should eq(now.month)
      time.day.should eq(now.day)
      time.hour.should eq(14)
      time.minute.should eq(30)
    end

    it "parses H:MM format (today)" do
      result = JosieHealth::Utils::Timestamp.parse_timestamp("9:30")
      result.should_not be_nil
      time = Time.parse_rfc3339(result.not_nil!)
      time.hour.should eq(9)
      time.minute.should eq(30)
    end

    it "parses HHMM format (today)" do
      result = JosieHealth::Utils::Timestamp.parse_timestamp("1430")
      result.should_not be_nil
      time = Time.parse_rfc3339(result.not_nil!)
      time.hour.should eq(14)
      time.minute.should eq(30)
    end

    it "returns nil for invalid hour" do
      JosieHealth::Utils::Timestamp.parse_timestamp("25:30").should be_nil
    end

    it "returns nil for invalid minute" do
      JosieHealth::Utils::Timestamp.parse_timestamp("14:99").should be_nil
    end

    it "returns nil for invalid format" do
      JosieHealth::Utils::Timestamp.parse_timestamp("not-a-time").should be_nil
    end
  end

  describe ".format_display" do
    it "shows time only for today's timestamps" do
      now = Time.utc
      today = Time.utc(now.year, now.month, now.day, 14, 30, 0).to_rfc3339
      result = JosieHealth::Utils::Timestamp.format_display(today)
      result.should eq("14:30")
    end

    it "shows full date for past timestamps" do
      past = Time.utc(2024, 6, 15, 14, 30, 0).to_rfc3339
      result = JosieHealth::Utils::Timestamp.format_display(past)
      result.should eq("2024-06-15 14:30")
    end

    it "returns input on parse error" do
      result = JosieHealth::Utils::Timestamp.format_display("invalid")
      result.should eq("invalid")
    end
  end

  describe ".now_rfc3339" do
    it "returns valid RFC3339 timestamp" do
      result = JosieHealth::Utils::Timestamp.now_rfc3339
      result.should match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}/)
      time = Time.parse_rfc3339(result)
      diff = Time.utc - time
      diff.total_seconds.abs.should be < 2
    end
  end
end