package backthink

import (
	"context"
	"strings"
	"testing"
	"time"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/channel/adapter"
)

func TestParseProactive_WithMarkers(t *testing.T) {
	t.Parallel()
	conclusion := "[我决定:push]\n[渠道:kook]\n我想提醒你明天有体检"
	msg, hint, push := parseProactive(conclusion)
	if !push {
		t.Fatalf("push = false, want true (decision said push)")
	}
	if hint != "kook" {
		t.Fatalf("channel hint = %q, want kook", hint)
	}
	if msg != "我想提醒你明天有体检" {
		t.Fatalf("message = %q, want the clean body", msg)
	}
}

func TestParseProactive_NoPushMarker(t *testing.T) {
	t.Parallel()
	conclusion := "[我决定:no_push]\n[渠道:telegram]\n暂时没有想说的"
	msg, hint, push := parseProactive(conclusion)
	if push {
		t.Fatalf("push = true, want false (decision said no_push)")
	}
	if hint != "telegram" {
		t.Fatalf("channel hint = %q, want telegram", hint)
	}
	if msg != "暂时没有想说的" {
		t.Fatalf("message = %q, want the clean body", msg)
	}
}

func TestParseProactive_ChannelColonWidth(t *testing.T) {
	t.Parallel()
	// Tolerate a full-width colon and trailing spaces, and uppercase channel value.
	conclusion := "[我决定：push]  [渠道：WEB]  晚上早点睡"
	msg, hint, push := parseProactive(conclusion)
	if !push {
		t.Fatalf("push = false, want true")
	}
	if hint != "web" {
		t.Fatalf("channel hint = %q, want web (lowercased)", hint)
	}
	if msg != "晚上早点睡" {
		t.Fatalf("message = %q, want the clean body", msg)
	}
}

func TestParseProactive_NothingVariants(t *testing.T) {
	t.Parallel()
	for _, c := range []string{
		"无",
		"无。",
		"nothing to report",
		"Nothing to report.",
		"nothing",
		"暂无",
	} {
		if _, _, push := parseProactive(c); push {
			t.Fatalf("parseProactive(%q) push = true, want false", c)
		}
	}
}

func TestParseProactive_NoMarkerDefaultPush(t *testing.T) {
	t.Parallel()
	conclusion := "洗衣机洗好了，衣服可以收了"
	msg, hint, push := parseProactive(conclusion)
	if !push {
		t.Fatalf("push = false, want true (no marker, not a nothing phrase)")
	}
	if hint != "" {
		t.Fatalf("channel hint = %q, want empty", hint)
	}
	if msg != conclusion {
		t.Fatalf("message = %q, want the whole conclusion", msg)
	}
}

func TestParseProactive_MalformedFailsSafe(t *testing.T) {
	t.Parallel()
	cases := []string{
		"[我决定:maybe]", // decision value outside allow-list
		"[我决定]",       // bracket without a value
		"[我决定:push",   // unterminated bracket
		"[渠道:web]",    // channel marker alone, no decision → but no decision marker
		"[我决定:push",   // deliberate ambiguity
	}
	for _, c := range cases {
		if _, _, push := parseProactive(c); push {
			t.Fatalf("parseProactive(%q) push = true, want false (fail safe on ambiguity)", c)
		}
	}
}

func TestParseProactive_MarkerWithoutBody(t *testing.T) {
	t.Parallel()
	// A lone push marker with no body must not push an empty message (fail safe).
	if _, _, push := parseProactive("[我决定:push]"); push {
		t.Fatalf("push = true for a marker with no body, want false")
	}
	// A push marker whose body says "nothing" is contradictory → fail safe.
	if _, _, push := parseProactive("[我决定:push]\n无"); push {
		t.Fatalf("push = true for a push marker with nothing body, want false")
	}
}

func TestThink_ParsesStructuredDecision_EndToEnd(t *testing.T) {
	t.Parallel()
	conclusion := "[我决定:push]\n[渠道:kook]\n我想提醒你明天有体检"
	thinker := &mockThinker{text: conclusion}
	active := &mockActive{n: 1}
	im := &mockIMAdapter{}
	b, _ := newBackthink(t, Config{}, Deps{
		Thinker: thinker,
		State:   &mockState{state: UserState{}},
		Active:  active,
		IM:      im,
		Gate:    &mockGate{allow: true},
		Now:     func() time.Time { return dayAt() },
	})

	b.think(context.Background(), heartbeatTrigger())

	// The channel hint "kook" routes to the IM bridge (a specific platform), not the
	// active client.
	if active.calls != 0 {
		t.Fatalf("active calls = %d, want 0 (specific platform routes to IM)", active.calls)
	}
	if im.count() != 1 {
		t.Fatalf("im calls = %d, want 1", im.count())
	}
	if im.last.Content != "我想提醒你明天有体检" {
		t.Fatalf("im message content = %q, want the clean body", im.last.Content)
	}
	if im.last.Platform != "kook" {
		t.Fatalf("im message platform = %q, want kook", im.last.Platform)
	}

	recs, err := b.List(context.Background(), 10)
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if len(recs) == 0 {
		t.Fatal("no record persisted")
	}
	if !recs[0].ShouldPush {
		t.Fatalf("ShouldPush = false, want true")
	}
	if recs[0].Conclusion != "我想提醒你明天有体检" {
		t.Fatalf("record Conclusion = %q, want the clean body", recs[0].Conclusion)
	}
	if recs[0].PushResult.Route != RouteIMBridge {
		t.Fatalf("record Route = %q, want %q", recs[0].PushResult.Route, RouteIMBridge)
	}
	if !strings.Contains(recs[0].PushResult.Detail, "channel_hint=kook") {
		t.Fatalf("record Detail = %q, want it to include the kook hint", recs[0].PushResult.Detail)
	}
	if !recs[0].PushResult.Pushed {
		t.Fatalf("record Pushed = false, want true")
	}
}

func TestThink_NoMarkerDefaultRoute_ActiveFirst(t *testing.T) {
	t.Parallel()
	// No channel marker → auto → active client first (the pre-P2 behavior).
	conclusion := "[我决定:push]\n洗衣机洗好了，衣服可以收了"
	thinker := &mockThinker{text: conclusion}
	active := &mockActive{n: 2}
	im := &mockIMAdapter{}
	b, _ := newBackthink(t, Config{}, Deps{
		Thinker: thinker,
		State:   &mockState{state: UserState{}},
		Active:  active,
		IM:      im,
		Gate:    &mockGate{allow: true},
		Now:     func() time.Time { return dayAt() },
	})

	b.think(context.Background(), heartbeatTrigger())

	if active.calls != 1 {
		t.Fatalf("active calls = %d, want 1", active.calls)
	}
	if im.count() != 0 {
		t.Fatalf("im calls = %d, want 0 (active preferred)", im.count())
	}
	recs, err := b.List(context.Background(), 10)
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if recs[0].PushResult.Route != RouteActiveClient {
		t.Fatalf("record Route = %q, want %q", recs[0].PushResult.Route, RouteActiveClient)
	}
	if recs[0].PushResult.Pushed != true {
		t.Fatalf("record Pushed = %v, want true", recs[0].PushResult.Pushed)
	}
}

func TestThink_ConcludedNoPush_NotPushed(t *testing.T) {
	t.Parallel()
	conclusion := "[我决定:no_push]\n今晚就不打扰她了"
	thinker := &mockThinker{text: conclusion}
	active := &mockActive{n: 1}
	im := &mockIMAdapter{}
	b, _ := newBackthink(t, Config{}, Deps{
		Thinker: thinker,
		State:   &mockState{state: UserState{}},
		Active:  active,
		IM:      im,
		Gate:    &mockGate{allow: true},
		Now:     func() time.Time { return dayAt() },
	})

	b.think(context.Background(), heartbeatTrigger())

	if active.calls != 0 || im.count() != 0 {
		t.Fatalf("push attempted despite no_push: active=%d im=%d", active.calls, im.count())
	}
	recs, err := b.List(context.Background(), 10)
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if recs[0].ShouldPush {
		t.Fatalf("ShouldPush = true, want false")
	}
	if recs[0].PushResult.Route != RouteNone {
		t.Fatalf("record Route = %q, want %q", recs[0].PushResult.Route, RouteNone)
	}
}

func TestThink_DoNotDisturbBlocksPush(t *testing.T) {
	t.Parallel()
	// She wants to push, but the user is asleep → the hard safety gate refuses,
	// regardless of her decision.
	conclusion := "[我决定:push]\n想跟你说晚安"
	thinker := &mockThinker{text: conclusion}
	b, _ := newBackthink(t, Config{}, Deps{
		Thinker: thinker,
		State:   &mockState{state: UserState{Sleeping: true}},
		Pusher:  &mockPusher{result: PushResult{Pushed: true, Route: RouteActiveClient}},
		Now:     func() time.Time { return nightAt() },
	})

	b.think(context.Background(), heartbeatTrigger())

	recs, err := b.List(context.Background(), 10)
	if err != nil {
		t.Fatalf("List: %v", err)
	}
	if recs[0].ShouldPush {
		t.Fatalf("ShouldPush = true, want false (asleep blocks push)")
	}
	if recs[0].PushResult.Route != RouteNone {
		t.Fatalf("record Route = %q, want %q", recs[0].PushResult.Route, RouteNone)
	}
}

func TestBuildProactiveMessage_DefaultPlatform(t *testing.T) {
	t.Parallel()
	b := &Backthink{now: dayAt}
	msg := b.buildProactiveMessage("晚安", "")
	if msg.Platform != defaultProactivePlatform {
		t.Fatalf("Platform = %q, want default %q", msg.Platform, defaultProactivePlatform)
	}
	if msg.Content != "晚安" {
		t.Fatalf("Content = %q, want 晚安", msg.Content)
	}
	if msg.ChannelType != adapter.ChannelDirect || msg.ContentType != adapter.ContentText {
		t.Fatalf("message kind = %q/%q, want direct/text", msg.ChannelType, msg.ContentType)
	}
}

func TestBuildProactiveMessage_SpecificPlatform(t *testing.T) {
	t.Parallel()
	b := &Backthink{now: dayAt}
	msg := b.buildProactiveMessage("晚安", "telegram")
	if msg.Platform != "telegram" {
		t.Fatalf("Platform = %q, want telegram", msg.Platform)
	}
}

func TestPusher_SpecificPlatform_NoIM_FallsBackToActive(t *testing.T) {
	t.Parallel()
	// When a specific platform is requested but no IM sink is wired, the pusher
	// falls back to the default route so the owner still receives the message, and
	// records the requested hint.
	active := &mockActive{n: 1}
	p := newPusher(active, nil, &mockGate{allow: true}, discardLog())
	res := p.Push(context.Background(), PushRequest{
		Message:     adapter.UnifiedMessage{},
		ChannelHint: "kook",
	})
	if !res.Pushed || res.Route != RouteActiveClient {
		t.Fatalf("push = %+v, want pushed active_client (fallback)", res)
	}
	if !strings.Contains(res.Detail, "channel_hint=kook") {
		t.Fatalf("Detail = %q, want it to include the kook hint", res.Detail)
	}
}