package addressparsing_test

import (
    "testing"

    "pkg.jfrech.com/brief/internal/addressparsing"
)

type CaseDropExtraneousWhitespace struct {
    S string

    Dropped string
}

func CasesDropExtraneousWhitespace() []CaseDropExtraneousWhitespace {
    return []CaseDropExtraneousWhitespace{
        CaseDropExtraneousWhitespace{"", ""},
        CaseDropExtraneousWhitespace{"\"\" \tf", "\"\" \tf"},
        CaseDropExtraneousWhitespace{"\"\" \t\"f\"", "\"\"\"f\""},
        CaseDropExtraneousWhitespace{"\"\" \t\"f", "\"\"\"f"},
        CaseDropExtraneousWhitespace{"\"\t", "\"\t"},
        CaseDropExtraneousWhitespace{"a .  c \t@example. COM", "a.c@example.COM"},
        CaseDropExtraneousWhitespace{"a .  c \t", "a.c"},
        CaseDropExtraneousWhitespace{"@example. COM", "@example.COM"},
    }
}

func TestDropExtraneousWhitespace(t *testing.T) {
    for j, tc := range CasesDropExtraneousWhitespace() {
        dropped := addressparsing.DropExtraneousWhitespace(tc.S)

        if dropped != tc.Dropped {
            t.Errorf("CasesDropExtraneousWhitespace()[%d]: addressparsing.DropExtraneousWhitespace(%q)\n    == %q\n    != %q", j, tc.S, dropped, tc.Dropped)
        }
    }
}

func FuzzDropExtraneousWhitespaceIdempotency(f *testing.F) {
    for _, tc := range CasesDropExtraneousWhitespace() {
        f.Add(tc.S)
        f.Add(tc.Dropped)
    }

    f.Fuzz(func(t *testing.T, s0 string) {
        s1 := addressparsing.DropExtraneousWhitespace(s0)
        s2 := addressparsing.DropExtraneousWhitespace(s1)

        if s1 != s2 {
            t.Errorf("idempotency contract violated:\n    s0=%q,\n    s1=%q,\n    s2=%q", s0, s1, s2)
        }
    })
}