package parser

import (
	"math"
	"testing"
)

func TestParseKM(t *testing.T) {
	tests := []struct {
		input   string
		wantKM  float64
		wantOK  bool
	}{
		{"Rode 25km today!", 25, true},
		{"Great 25.5 km ride", 25.5, true},
		{"Did 25,5km on Zwift", 25.5, true},
		{"50KM morning loop", 50, true},
		{"100 kilometers on the gravel bike", 100, true},
		{"30 miles today", 30 * miToKM, true},
		{"Did a 100k ride", 100, true},
		{"Went for a 80k loop", 80, true},
		{"5,981.9 miles", 5981.9 * miToKM, true},
		{"1,000km ride", 1000, true},
		// Should NOT match — no cycling context for bare "k"
		{"Listened to 100k songs", 0, false},
		// No distance at all
		{"Great weather today!", 0, false},
		{"PR on the climb!", 0, false},
	}

	for _, tt := range tests {
		t.Run(tt.input, func(t *testing.T) {
			got, ok := ParseKM(tt.input)
			if ok != tt.wantOK {
				t.Errorf("ParseKM(%q) ok=%v, want %v", tt.input, ok, tt.wantOK)
				return
			}
			if tt.wantOK && math.Abs(got-tt.wantKM) > 0.01 {
				t.Errorf("ParseKM(%q) = %.2f, want %.2f", tt.input, got, tt.wantKM)
			}
		})
	}
}