package tui

import (
	"encoding/json"
	"testing"
)

func TestParseChecklist(t *testing.T) {
	tests := []struct {
		name     string
		cardData *string
		wantLen  int
	}{
		{"nil data", nil, 0},
		{"empty JSON", ptr("{}"), 0},
		{"malformed JSON", ptr("{bad"), 0},
		{"valid steps", ptr(`{"steps":[{"text":"step 1","done":false},{"text":"step 2","done":true}]}`), 2},
		{"empty steps array", ptr(`{"steps":[]}`), 0},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := parseChecklist(tt.cardData)
			if len(got) != tt.wantLen {
				t.Fatalf("parseChecklist() returned %d steps, want %d", len(got), tt.wantLen)
			}
		})
	}
}

func TestParseChecklist_PreservesDoneState(t *testing.T) {
	data := `{"steps":[{"text":"first","done":false},{"text":"second","done":true}]}`
	steps := parseChecklist(&data)
	if steps[0].Done {
		t.Fatal("step 0 should not be done")
	}
	if !steps[1].Done {
		t.Fatal("step 1 should be done")
	}
	if steps[0].Text != "first" || steps[1].Text != "second" {
		t.Fatalf("texts wrong: %q, %q", steps[0].Text, steps[1].Text)
	}
}

func TestDoneCount(t *testing.T) {
	r := newRunModel("id", ptr(`{"steps":[{"label":"a","done":true},{"label":"b","done":false},{"label":"c","done":true}]}`))
	if got := r.doneCount(); got != 2 {
		t.Fatalf("doneCount() = %d, want 2", got)
	}
}

func TestStepsJSON_Roundtrip(t *testing.T) {
	r := newRunModel("id", ptr(`{"steps":[{"text":"test","done":false}]}`))
	out := r.stepsJSON()

	var parsed struct {
		Steps []runStep `json:"steps"`
	}
	if err := json.Unmarshal([]byte(out), &parsed); err != nil {
		t.Fatalf("stepsJSON() produced invalid JSON: %v", err)
	}
	if len(parsed.Steps) != 1 || parsed.Steps[0].Text != "test" {
		t.Fatalf("roundtrip failed: %+v", parsed.Steps)
	}
}