package bonfire

import (
	"bytes"
	"context"
	"errors"
	"strings"
	"testing"

	"github.com/charmbracelet/x/ansi"
)

// noEnv is a lookup with no environment variables set.
func noEnv(string) string { return "" }

// exerciseWidgets runs every widget once on c: status lines, a spinner, a
// progress bar of four steps, the process view over a, b (failing) and c,
// a table, a data line and an error.
func exerciseWidgets(t *testing.T, c *console) {
	t.Helper()
	c.Info("info line")
	c.Success("success line")
	c.Warning("warning line")
	if err := c.Spinner("spinning", func() error { return nil }); err != nil {
		t.Fatalf("Spinner: %v", err)
	}
	if err := c.Progress(4, func(p Progress) error {
		for range 4 {
			p.Advance(1)
		}
		return nil
	}); err != nil {
		t.Fatalf("Progress: %v", err)
	}
	err := Process(context.Background(), c, "Importing", []string{"a", "b", "c"}, func(_ context.Context, item string) error {
		if item == "b" {
			return errors.New("bad row")
		}
		return nil
	})
	if err == nil || !strings.Contains(err.Error(), "b: bad row") {
		t.Fatalf("Process err = %v", err)
	}
	c.Table([]string{"key", "value"}, [][]string{{"k1", "v1"}, {"k2"}})
	c.Println("data line")
	c.Error("boom")
}

// TestWidgetMatrix: every widget degrades by mode. Not a terminal gives
// the pre-phase plain lines byte for byte; -q keeps data and errors only;
// --no-ansi and -n on a terminal print plain lines (no live view), and
// --no-ansi writes no escape codes; a terminal runs the live views.
func TestWidgetMatrix(t *testing.T) {
	type streams struct{ out, err bytes.Buffer }
	newC := func(s *streams, tty bool, g Globals) *console {
		c := newConsole(strings.NewReader(""), &s.out, &s.err, noEnv, boolPtr(tty), boolPtr(tty))
		c.setGlobals(g)
		return c
	}

	t.Run("not a terminal", func(t *testing.T) {
		var s streams
		exerciseWidgets(t, newC(&s, false, Globals{}))
		wantOut := "ℹ info line\n✓ success line\n⚠ warning line\n" +
			"[...] spinning\n" +
			"[2/4] 50%\n[4/4] 100%\n" +
			"✓ a\n✓ c\n" +
			"key\tvalue\nk1\tv1\nk2\t\n" +
			"data line\n"
		if got := s.out.String(); got != wantOut {
			t.Errorf("stdout:\n got %q\nwant %q", got, wantOut)
		}
		if got, want := s.err.String(), "✗ b: bad row\n✗ boom\n"; got != want {
			t.Errorf("stderr:\n got %q\nwant %q", got, want)
		}
	})

	t.Run("quiet", func(t *testing.T) {
		for _, tty := range []bool{false, true} {
			var s streams
			exerciseWidgets(t, newC(&s, tty, Globals{Quiet: true, NoInteraction: true}))
			out := ansi.Strip(s.out.String())
			for _, gone := range []string{"info line", "success line", "warning line", "spinning", "[4/4]", "4/4", "✓ a", "Importing"} {
				if strings.Contains(out, gone) {
					t.Errorf("tty %v: -q printed %q:\n%s", tty, gone, out)
				}
			}
			for _, kept := range []string{"k1", "v1", "data line\n"} {
				if !strings.Contains(out, kept) {
					t.Errorf("tty %v: -q dropped data %q:\n%s", tty, kept, out)
				}
			}
			errOut := ansi.Strip(s.err.String())
			if !strings.Contains(errOut, "✗ b: bad row") || !strings.Contains(errOut, "✗ boom") {
				t.Errorf("tty %v: -q dropped errors: %q", tty, errOut)
			}
		}
	})

	t.Run("no-ansi on a terminal", func(t *testing.T) {
		var s streams
		exerciseWidgets(t, newC(&s, true, Globals{Color: ColorNever}))
		out := s.out.String()
		if strings.Contains(out, "\x1b") || strings.Contains(s.err.String(), "\x1b") {
			t.Errorf("--no-ansi wrote escape codes:\n%q\n%q", out, s.err.String())
		}
		for _, want := range []string{"ℹ info line\n", "[...] spinning\n", "[2/4] 50%\n", "✓ a\n", "data line\n", "┌"} {
			if !strings.Contains(out, want) {
				t.Errorf("--no-ansi lacks %q:\n%s", want, out)
			}
		}
	})

	t.Run("no-interaction on a terminal", func(t *testing.T) {
		var s streams
		exerciseWidgets(t, newC(&s, true, Globals{NoInteraction: true}))
		out := s.out.String()
		if strings.Contains(out, "\x1b[?25l") {
			t.Errorf("-n ran a live view (cursor hidden):\n%q", out)
		}
		plain := ansi.Strip(out)
		for _, want := range []string{"ℹ info line\n", "[...] spinning\n", "[4/4] 100%\n", "✓ a\n", "data line\n"} {
			if !strings.Contains(plain, want) {
				t.Errorf("-n lacks %q:\n%s", want, plain)
			}
		}
		if !strings.Contains(out, "\x1b[") {
			t.Errorf("-n on a color terminal lost its colors:\n%q", out)
		}
	})

	t.Run("terminal", func(t *testing.T) {
		var s streams
		c := newC(&s, true, Globals{})
		if !c.live() {
			t.Fatal("a terminal console without flags does not animate")
		}
		exerciseWidgets(t, c)
		// The live views ran as bubbletea programs (the renderer hides the
		// cursor). A buffer has no window size, so the renderer draws no
		// frames here; TestLiveModels renders them with a fixed size.
		if n := strings.Count(s.out.String(), "\x1b[?25l"); n != 3 {
			t.Errorf("want 3 live views (spinner, progress, process), cursor hidden %d times:\n%q", n, s.out.String())
		}
		out := ansi.Strip(s.out.String())
		for _, want := range []string{"ℹ info line", "┌", "k1", "data line"} {
			if !strings.Contains(out, want) {
				t.Errorf("terminal output lacks %q:\n%s", want, out)
			}
		}
		if strings.Contains(out, "[...] spinning") || strings.Contains(out, "[2/4] 50%") || strings.Contains(out, "✓ a\n") {
			t.Errorf("terminal printed the plain fallback lines:\n%s", out)
		}
		if !strings.Contains(ansi.Strip(s.err.String()), "✗ boom") {
			t.Errorf("terminal error line missing: %q", s.err.String())
		}
	})
}

// TestPromptsNoInteraction: with -n or -q every prompt returns its default
// without reading stdin or printing, even on an interactive terminal.
func TestPromptsNoInteraction(t *testing.T) {
	for _, g := range []Globals{{NoInteraction: true}, {Quiet: true, NoInteraction: true}} {
		in := strings.NewReader("typed\n")
		var buf bytes.Buffer
		c := newConsole(in, &buf, &buf, noEnv, boolPtr(true), boolPtr(true))
		c.setGlobals(g)
		if got, err := c.Ask("name", "bob"); err != nil || got != "bob" {
			t.Errorf("%+v: Ask = %q, %v", g, got, err)
		}
		for _, def := range []bool{true, false} {
			if got, err := c.Confirm("sure?", def); err != nil || got != def {
				t.Errorf("%+v: Confirm(def %v) = %v, %v", g, def, got, err)
			}
		}
		choices := []string{"a", "b", "c"}
		for def, want := range map[int]string{0: "a", 2: "c", 5: "a", -1: "a"} {
			if got, err := c.Choice("pick", choices, def); err != nil || got != want {
				t.Errorf("%+v: Choice(def %d) = %q, %v; want %q", g, def, got, err, want)
			}
		}
		if _, err := c.Choice("pick", nil, 0); err == nil {
			t.Errorf("%+v: Choice without options did not fail", g)
		}
		if in.Len() != len("typed\n") || buf.Len() != 0 {
			t.Errorf("%+v: prompts read stdin or printed: left %d, out %q", g, in.Len(), buf.String())
		}
		if Interactive(c) {
			t.Errorf("%+v: Interactive is true", g)
		}
	}
}

// TestSecretWithNoInteraction: under -n a secret is read from piped stdin
// (empty on EOF); with a terminal stdin it fails with a hint naming the
// piped form, because a secret has no default.
func TestSecretWithNoInteraction(t *testing.T) {
	var buf bytes.Buffer
	c := newConsole(strings.NewReader("  s3cret-value  \nnext\n"), &buf, &buf, noEnv, boolPtr(false), boolPtr(false))
	c.setGlobals(Globals{NoInteraction: true})
	if got, err := c.Secret("password"); err != nil || got != "s3cret-value" {
		t.Fatalf("piped Secret = %q, %v", got, err)
	}
	if buf.Len() != 0 {
		t.Errorf("piped Secret printed a prompt: %q", buf.String())
	}
	empty := newConsole(strings.NewReader(""), &buf, &buf, noEnv, boolPtr(false), boolPtr(false))
	empty.setGlobals(Globals{NoInteraction: true})
	if got, err := empty.Secret("password"); err != nil || got != "" {
		t.Errorf("Secret on empty stdin = %q, %v", got, err)
	}

	term := newConsole(strings.NewReader("never read\n"), &buf, &buf, noEnv, boolPtr(true), boolPtr(true))
	term.setGlobals(Globals{NoInteraction: true})
	term.inTTY = true
	_, err := term.Secret("password")
	var hint *HintError
	if !errors.As(err, &hint) || !errors.Is(err, errSecretNoInteraction) {
		t.Fatalf("terminal Secret under -n: %v", err)
	}
	var block bytes.Buffer
	RenderError(&block, "acme", err, Globals{Color: ColorNever})
	if !strings.Contains(block.String(), `printf '%s\n' "$VALUE" | bin/acme <command> -n`) {
		t.Errorf("hint does not show the piped form:\n%s", block.String())
	}
}

// TestConfirmProceed: off a terminal, under -n and for an Output that is
// not a bonfire console it proceeds without reading stdin; on an
// interactive terminal it asks, defaulting to no.
func TestConfirmProceed(t *testing.T) {
	in := strings.NewReader("n\n")
	var buf bytes.Buffer
	for name, c := range map[string]*console{
		"not a terminal": newConsole(in, &buf, &buf, noEnv, boolPtr(false), boolPtr(false)),
		"-n":             newConsole(in, &buf, &buf, noEnv, boolPtr(true), boolPtr(true)),
	} {
		if name == "-n" {
			c.setGlobals(Globals{NoInteraction: true})
		}
		if ok, err := ConfirmProceed(c, "Drop every table?"); err != nil || !ok {
			t.Errorf("%s: ConfirmProceed = %v, %v", name, ok, err)
		}
	}
	if in.Len() != 2 || buf.Len() != 0 {
		t.Errorf("ConfirmProceed read stdin or printed: left %d, out %q", in.Len(), buf.String())
	}
	if ok, err := ConfirmProceed(struct{ Output }{}, "Drop?"); err != nil || !ok {
		t.Errorf("foreign Output: ConfirmProceed = %v, %v", ok, err)
	}

	for answer, want := range map[string]bool{"n\n": false, "y\n": true, "yes\n": true, "\n": false, "": false} {
		var out bytes.Buffer
		c := newConsole(strings.NewReader(answer), &out, &out, noEnv, boolPtr(true), boolPtr(true))
		// --no-ansi keeps the line prompt on a terminal (huh needs a real
		// terminal).
		c.setGlobals(Globals{Color: ColorNever})
		ok, err := ConfirmProceed(c, "Drop every table?")
		if err != nil || ok != want {
			t.Errorf("answer %q: ConfirmProceed = %v, %v; want %v", answer, ok, err, want)
		}
		if !strings.Contains(out.String(), "Drop every table? [y/N]") {
			t.Errorf("answer %q: question not asked: %q", answer, out.String())
		}
	}
}

// TestPrintAbove: without a live view PrintAbove reports false; while one
// runs, the line (and Println output) prints above it.
func TestPrintAbove(t *testing.T) {
	if PrintAbove("nobody listens") {
		t.Fatal("PrintAbove reported a running view")
	}
	var out, errW bytes.Buffer
	c := newConsole(strings.NewReader(""), &out, &errW, noEnv, boolPtr(true), boolPtr(true))
	var during bool
	err := c.Spinner("working", func() error {
		during = PrintAbove("log line above the view")
		c.Println("println above the view")
		return nil
	})
	if err != nil || !during {
		t.Fatalf("Spinner err %v, PrintAbove during the view %v", err, during)
	}
	if PrintAbove("after") {
		t.Error("PrintAbove reported a view after it ended")
	}
	got := ansi.Strip(out.String())
	for _, want := range []string{"log line above the view", "println above the view"} {
		if !strings.Contains(got, want) {
			t.Errorf("output lacks %q:\n%s", want, got)
		}
	}
	if strings.Contains(got, "[...] working") {
		t.Errorf("the spinner did not run as a live view:\n%s", got)
	}
}