package presenter

import (
	"bytes"
	"encoding/json"
	"strings"
	"testing"
	"time"

	"gitea.oblak.solutions/dimitar/gitFlow/internal/ai"
	"gitea.oblak.solutions/dimitar/gitFlow/pkg/status"
)

func sampleResult() status.ScanResult {
	return status.ScanResult{
		ScannedAt: time.Date(2026, 1, 2, 3, 4, 5, 0, time.UTC),
		ParentDir: "/home/user/projects",
		Repos: []status.RepoInfo{
			{Path: "/home/user/projects/api", Name: "api", Branch: "main", Status: status.StatusClean},
			{
				Path:           "/home/user/projects/web",
				Name:           "web",
				Branch:         "feat/login",
				Status:         status.StatusModified,
				ModifiedFiles:  []string{"a.go"},
				UntrackedFiles: []string{"b"},
				AheadBy:        3,
			},
			{Path: "/home/user/projects/lib", Name: "lib", Branch: "main", Status: status.StatusBehind, BehindBy: 5},
			{Path: "/home/user/projects/legacy", Name: "legacy", Branch: "(detached)", Detached: true, Status: status.StatusDetached},
			{Path: "/home/user/projects/broken", Name: "broken", Status: status.StatusError, Error: "git status: fatal: not a git repository"},
		},
	}
}

func TestParseColorMode(t *testing.T) {
	cases := []struct {
		in   string
		want ColorMode
	}{
		{"auto", ColorAuto},
		{"always", ColorAlways},
		{"never", ColorNever},
		{"bogus", ColorAuto},
	}
	for _, tc := range cases {
		if got := ParseColorMode(tc.in); got != tc.want {
			t.Errorf("ParseColorMode(%q) = %v, want %v", tc.in, got, tc.want)
		}
	}
}

func TestTableFormat(t *testing.T) {
	var buf bytes.Buffer
	opts := Options{Color: ColorNever}
	if err := Present(&buf, "table", sampleResult(), opts); err != nil {
		t.Fatalf("Present: %v", err)
	}
	out := buf.String()
	for _, want := range []string{
		"REPOSITORY", "BRANCH", "STATUS", "AHEAD/BEHIND", "CHANGES",
		"api", "feat/login", "1M 1U", "0/5", "3/0",
		"5 repos | 1 clean | 3 need attention | 1 errors",
		"not a git repository",
	} {
		if !strings.Contains(out, want) {
			t.Errorf("table output missing %q:\n%s", want, out)
		}
	}
	if strings.Contains(out, "\x1b[") {
		t.Errorf("table output contains escape codes with ColorNever:\n%q", out)
	}
}

func TestTableColorAlways(t *testing.T) {
	t.Setenv("NO_COLOR", "1") // explicit always must win over NO_COLOR
	var buf bytes.Buffer
	if err := Present(&buf, "table", sampleResult(), Options{Color: ColorAlways}); err != nil {
		t.Fatalf("Present: %v", err)
	}
	if !strings.Contains(buf.String(), "\x1b[") {
		t.Error("ColorAlways produced no escape codes")
	}
}

func TestTableRespectsNoColor(t *testing.T) {
	t.Setenv("NO_COLOR", "1")
	var buf bytes.Buffer
	// ColorAuto with a non-terminal writer: no color regardless of NO_COLOR,
	// but this also verifies NO_COLOR is read without panicking.
	if err := Present(&buf, "table", sampleResult(), Options{Color: ColorAuto}); err != nil {
		t.Fatalf("Present: %v", err)
	}
	if strings.Contains(buf.String(), "\x1b[") {
		t.Error("auto color on non-TTY writer produced escape codes")
	}
}

func TestJSONFormat(t *testing.T) {
	var buf bytes.Buffer
	if err := Present(&buf, "json", sampleResult(), Options{}); err != nil {
		t.Fatalf("Present: %v", err)
	}
	var doc struct {
		ScannedAt time.Time         `json:"scanned_at"`
		ParentDir string            `json:"parent_dir"`
		Repos     []status.RepoInfo `json:"repos"`
		Summary   status.Summary    `json:"summary"`
	}
	if err := json.Unmarshal(buf.Bytes(), &doc); err != nil {
		t.Fatalf("output is not valid JSON: %v\n%s", err, buf.String())
	}
	if doc.ParentDir != "/home/user/projects" {
		t.Errorf("parent_dir = %q", doc.ParentDir)
	}
	if len(doc.Repos) != 5 {
		t.Errorf("len(repos) = %d, want 5", len(doc.Repos))
	}
	if doc.Repos[1].Status != status.StatusModified {
		t.Errorf("repos[1].status = %v, want modified", doc.Repos[1].Status)
	}
	if doc.Summary.Total != 5 || doc.Summary.Clean != 1 || doc.Summary.Attention != 3 || doc.Summary.Errored != 1 {
		t.Errorf("summary = %+v", doc.Summary)
	}
	// Status must marshal as a string label, not an int.
	if !strings.Contains(buf.String(), `"status": "modified"`) {
		t.Errorf("status not marshaled as string label:\n%s", buf.String())
	}
}

func TestCompactFormat(t *testing.T) {
	var buf bytes.Buffer
	if err := Present(&buf, "compact", sampleResult(), Options{Color: ColorNever}); err != nil {
		t.Fatalf("Present: %v", err)
	}
	out := buf.String()
	for _, want := range []string{"✓", "✗", "↓", "◉", "!", "+3/-0", "2 change(s)"} {
		if !strings.Contains(out, want) {
			t.Errorf("compact output missing %q:\n%s", want, out)
		}
	}
}

func TestForRejectsUnknownFormat(t *testing.T) {
	if _, err := For("xml", Options{}); err == nil {
		t.Error("For(xml) succeeded, want error")
	}
}

func TestSuggestions(t *testing.T) {
	sugs := []ai.Suggestion{
		{RepoPath: "/home/user/projects/web", Action: "commit", Message: "commit your work", Command: "git add -A && git commit -m wip", Priority: 2},
		{RepoPath: "/home/user/projects/lib", Action: "pull", Message: "pull latest", Command: "git pull", Priority: 1},
	}
	var buf bytes.Buffer
	if err := Suggestions(&buf, Options{Color: ColorNever}, sugs); err != nil {
		t.Fatalf("Suggestions: %v", err)
	}
	out := buf.String()
	for _, want := range []string{"AI SUGGESTIONS", "commit", "pull", "high", "medium", "git pull"} {
		if !strings.Contains(out, want) {
			t.Errorf("suggestions output missing %q:\n%s", want, out)
		}
	}
	if strings.Contains(out, "\x1b[") {
		t.Errorf("suggestions contain escape codes with ColorNever")
	}
}

func TestSuggestionsEmpty(t *testing.T) {
	var buf bytes.Buffer
	if err := Suggestions(&buf, Options{}, nil); err != nil {
		t.Fatalf("Suggestions: %v", err)
	}
	if !strings.Contains(buf.String(), "no suggestions") {
		t.Errorf("empty suggestions message missing: %q", buf.String())
	}
}