package parse

import (
	"strings"
	"testing"
)

func sp(s string) *string { return &s }

func TestParse(t *testing.T) {
	tests := []struct {
		name       string
		input      string
		wantBody   string
		wantGlyph  string
		wantTitle  *string
		wantDesc   *string
		wantTime   *string
		wantTags   []string
		wantCard   *string
		wantErrSub string
	}{
		// Glyph detection
		{"plain note", "hello world", "hello world", "note", nil, nil, nil, nil, nil, ""},
		{"dash todo", "- deploy nginx", "deploy nginx", "todo", nil, nil, nil, nil, nil, ""},
		{"unicode todo", "▸ deploy nginx", "deploy nginx", "todo", nil, nil, nil, nil, nil, ""},
		{"star event", "* dentist", "dentist", "event", nil, nil, nil, nil, nil, ""},
		{"unicode event", "◇ dentist", "dentist", "event", nil, nil, nil, nil, nil, ""},

		// Time anchor
		{"with time", "meeting @14:00", "meeting", "note", nil, nil, sp("14:00"), nil, nil, ""},
		{"time at start", "@9:30 standup", "standup", "note", nil, nil, sp("9:30"), nil, nil, ""},
		{"invalid hours", "meeting @25:00", "", "", nil, nil, nil, nil, nil, "invalid time"},
		{"invalid minutes", "meeting @14:60", "", "", nil, nil, nil, nil, nil, "invalid time"},

		// Tags
		{"single tag", "deploy #ops", "deploy", "note", nil, nil, nil, []string{"ops"}, nil, ""},
		{"multiple tags", "deploy #ops #infra", "deploy", "note", nil, nil, nil, []string{"ops", "infra"}, nil, ""},
		{"duplicate tags", "deploy #ops #ops", "deploy", "note", nil, nil, nil, []string{"ops"}, nil, ""},
		{"tag with hyphen", "task #dev-ops", "task", "note", nil, nil, nil, []string{"dev-ops"}, nil, ""},

		// Card suffix
		{"caret card", "trick #nginx ^card", "trick", "note", nil, nil, nil, []string{"nginx"}, sp("snippet"), ""},
		{"caret c", "trick ^c", "trick", "note", nil, nil, nil, nil, sp("snippet"), ""},
		{"caret template", "deploy ${host} ^template", "deploy ${host}", "note", nil, nil, nil, nil, sp("template"), ""},
		{"caret snippet explicit", "trick ^snippet", "trick", "note", nil, nil, nil, nil, sp("snippet"), ""},
		{"invalid card type", "thing ^bogus", "", "", nil, nil, nil, nil, nil, "invalid card type"},

		// Combined
		{"full input", "- deploy nginx to staging @15:00 #ops", "deploy nginx to staging", "todo", nil, nil, sp("15:00"), []string{"ops"}, nil, ""},
		{"full with card", "figured out the proxy_pass trick #nginx ^card", "figured out the proxy_pass trick", "note", nil, nil, nil, []string{"nginx"}, sp("snippet"), ""},

		// Title
		{"title with body", "|nginx trick\nproxy_pass trailing slash #ops", "proxy_pass trailing slash", "note", sp("nginx trick"), nil, nil, []string{"ops"}, nil, ""},
		{"no title", "no pipe here #ops", "no pipe here", "note", nil, nil, nil, []string{"ops"}, nil, ""},
		{"todo with title", "- |deploy staging\nrebuild docker #ops", "rebuild docker", "todo", sp("deploy staging"), nil, nil, []string{"ops"}, nil, ""},
		{"title only", "|title only", "", "note", sp("title only"), nil, nil, nil, nil, ""},
		{"title and desc", "|title // description #ops\nbody here", "body here", "note", sp("title"), sp("description"), nil, []string{"ops"}, nil, ""},
		{"todo title desc", "- |deploy staging // rebuild and push #ops", "", "todo", sp("deploy staging"), sp("rebuild and push"), nil, []string{"ops"}, nil, ""},

		// Description without title
		{"leading desc", "// leading desc\nbody content", "body content", "note", nil, sp("leading desc"), nil, nil, nil, ""},
		{"inline desc", "body text // inline desc", "body text", "note", nil, sp("inline desc"), nil, nil, nil, ""},
		{"url no split", "http://example.com // should not split", "http://example.com // should not split", "note", nil, nil, nil, nil, nil, ""},

		// Edge cases
		{"empty input", "", "", "", nil, nil, nil, nil, nil, "empty"},
		{"only glyph", "-", "", "", nil, nil, nil, nil, nil, "empty body"},
		{"only modifiers", "#ops @14:00", "", "", nil, nil, nil, nil, nil, "empty body"},
		{"whitespace only", "   ", "", "", nil, nil, nil, nil, nil, "empty"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := Parse(tt.input)

			if tt.wantErrSub != "" {
				if err == nil {
					t.Fatalf("expected error containing %q, got nil", tt.wantErrSub)
				}
				if !strings.Contains(err.Error(), tt.wantErrSub) {
					t.Fatalf("expected error containing %q, got %q", tt.wantErrSub, err.Error())
				}
				return
			}

			if err != nil {
				t.Fatalf("unexpected error: %v", err)
			}

			if got.Body != tt.wantBody {
				t.Errorf("body: got %q, want %q", got.Body, tt.wantBody)
			}
			if got.Glyph != tt.wantGlyph {
				t.Errorf("glyph: got %q, want %q", got.Glyph, tt.wantGlyph)
			}
			if !ptrEq(got.Title, tt.wantTitle) {
				t.Errorf("title: got %v, want %v", strPtr(got.Title), strPtr(tt.wantTitle))
			}
			if !ptrEq(got.Description, tt.wantDesc) {
				t.Errorf("description: got %v, want %v", strPtr(got.Description), strPtr(tt.wantDesc))
			}
			if !ptrEq(got.TimeAnchor, tt.wantTime) {
				t.Errorf("time_anchor: got %v, want %v", strPtr(got.TimeAnchor), strPtr(tt.wantTime))
			}
			if !tagsEq(got.Tags, tt.wantTags) {
				t.Errorf("tags: got %v, want %v", got.Tags, tt.wantTags)
			}
			if !ptrEq(got.CardSuffix, tt.wantCard) {
				t.Errorf("card_suffix: got %v, want %v", strPtr(got.CardSuffix), strPtr(tt.wantCard))
			}
		})
	}
}

func ptrEq(a, b *string) bool {
	if a == nil && b == nil {
		return true
	}
	if a == nil || b == nil {
		return false
	}
	return *a == *b
}

func strPtr(p *string) string {
	if p == nil {
		return "<nil>"
	}
	return *p
}

func tagsEq(a, b []string) bool {
	if len(a) == 0 && len(b) == 0 {
		return true
	}
	if len(a) != len(b) {
		return false
	}
	for i := range a {
		if a[i] != b[i] {
			return false
		}
	}
	return true
}