//go:build integration

package httpx

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"go.mongodb.org/mongo-driver/v2/bson"

	"bountyboard/internal/domain"
	"bountyboard/internal/store"
	"bountyboard/internal/workperform"
)

// lifecycleStack: admin-created customer, consultant, developer in pool, and
// one atomized task ready to publish.
type lifecycleStack struct {
	ts         *httptest.Server
	srv        *Server
	st         *store.Store
	consultant *http.Client
	consCSRF   string
	consUser   domain.User
	developer  *http.Client
	devCSRF    string
	devUser    domain.User
	task       *domain.Task
	customerID string
}

func newLifecycleStack(t *testing.T, extraEnv map[string]string) *lifecycleStack {
	t.Helper()
	ts, srv, st, _ := newAuthStack(t, extraEnv)

	cc := newClient(t)
	consUser := registerUser(t, ts.URL, cc, "lc-cons@example.com", "Lifecycle Cons")
	promote(t, st, consUser.ID, map[string]bool{"consultant": true})

	dc := newClient(t)
	devUser := registerUser(t, ts.URL, dc, "lc-dev@example.com", "Lifecycle Dev")

	customer := &domain.Customer{
		Name:          "LC Customer",
		Ticketing:     domain.Ticketing{Type: domain.TicketingDemo, ProjectKey: "LC"},
		ConsultantIDs: []string{consUser.ID},
		DefaultBudget: 1000,
	}
	if err := st.CreateCustomer(t.Context(), customer); err != nil {
		t.Fatal(err)
	}

	// consultant pools the developer
	consCSRF := csrfFrom(t, cc, ts.URL)
	resp := postJSON(t, cc, ts.URL+"/api/v1/consultant/pool",
		map[string]string{"developerId": devUser.ID}, consCSRF)
	if resp.StatusCode != http.StatusCreated {
		t.Fatalf("add to pool: %d", resp.StatusCode)
	}
	resp.Body.Close()

	task := &domain.Task{
		CustomerID: customer.ID, ConsultantID: consUser.ID,
		Origin: domain.OriginSubdivided, Status: domain.StatusAtomized,
		Title: "Build the CSV importer", Description: "as specified",
		AcceptanceCriteria: []string{"imports valid rows", "reports bad rows"},
		EffortCoefficient:  0.25, Budget: 1000, Bounty: 250,
	}
	if err := st.InsertTask(t.Context(), task); err != nil {
		t.Fatal(err)
	}

	return &lifecycleStack{
		ts: ts, srv: srv, st: st,
		consultant: cc, consCSRF: consCSRF, consUser: consUser,
		developer: dc, devCSRF: csrfFrom(t, dc, ts.URL), devUser: devUser,
		task: task, customerID: customer.ID,
	}
}

func (l *lifecycleStack) taskStatus(t *testing.T) domain.TaskStatus {
	t.Helper()
	fresh, err := l.st.TaskByID(t.Context(), l.task.ID)
	if err != nil {
		t.Fatal(err)
	}
	return fresh.Status
}

func mustPost(t *testing.T, c *http.Client, url string, body any, csrf string, want int) *http.Response {
	t.Helper()
	resp := postJSON(t, c, url, body, csrf)
	if resp.StatusCode != want {
		var buf bytes.Buffer
		buf.ReadFrom(resp.Body)
		t.Fatalf("POST %s: %d (want %d): %s", url, resp.StatusCode, want, buf.String())
	}
	return resp
}

func TestFullLifecycleImportedToApproved(t *testing.T) {
	l := newLifecycleStack(t, nil)
	base := l.ts.URL + "/api/v1/tasks/" + l.task.ID

	// consultant publishes
	mustPost(t, l.consultant, base+"/publish", map[string]any{}, l.consCSRF, http.StatusOK).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusPublished {
		t.Fatalf("after publish: %s", got)
	}

	// developer sees it on the board with the right bounty
	resp, err := l.developer.Get(l.ts.URL + "/api/v1/board")
	if err != nil {
		t.Fatal(err)
	}
	var board struct {
		Tasks []domain.Task `json:"tasks"`
	}
	bodyJSON(t, resp, &board)
	if len(board.Tasks) != 1 || board.Tasks[0].Bounty != 250 {
		t.Fatalf("board: %+v", board.Tasks)
	}

	// developer claims
	mustPost(t, l.developer, base+"/claim", map[string]string{"note": "I know CSV"}, l.devCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusClaimRequested {
		t.Fatalf("after claim: %s", got)
	}

	// premature lifecycle calls are rejected
	resp = postJSON(t, l.developer, base+"/start", map[string]any{}, l.devCSRF)
	if resp.StatusCode != http.StatusForbidden { // not assignee yet
		t.Fatalf("start before assignment: %d", resp.StatusCode)
	}
	resp.Body.Close()

	// consultant approves the claim
	mustPost(t, l.consultant, base+"/approve-claim",
		map[string]string{"developerId": l.devUser.ID}, l.consCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusAssigned {
		t.Fatalf("after approve-claim: %s", got)
	}

	// developer starts, logs time, comments, submits
	mustPost(t, l.developer, base+"/start", map[string]any{}, l.devCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.developer, base+"/time",
		map[string]any{"minutes": 90, "note": "parser"}, l.devCSRF, http.StatusCreated).Body.Close()
	mustPost(t, l.developer, base+"/comments",
		map[string]any{"body": "<p>Done, see <b>PR</b> <script>alert(1)</script></p>"},
		l.devCSRF, http.StatusCreated).Body.Close()
	mustPost(t, l.developer, base+"/submit-review", map[string]any{}, l.devCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusInReview {
		t.Fatalf("after submit: %s", got)
	}

	// comment was sanitized
	fresh, _ := l.st.TaskByID(t.Context(), l.task.ID)
	if len(fresh.Comments) != 1 || bytes.Contains([]byte(fresh.Comments[0].Body), []byte("<script")) {
		t.Fatalf("comment sanitization: %+v", fresh.Comments)
	}
	if len(fresh.TimeLog) != 1 || fresh.TimeLog[0].Minutes != 90 {
		t.Fatalf("time log: %+v", fresh.TimeLog)
	}

	// consultant reviews in the queue, then requests changes
	qResp, err := l.consultant.Get(l.ts.URL + "/api/v1/consultant/reviews")
	if err != nil {
		t.Fatal(err)
	}
	var queue struct {
		Tasks []domain.Task `json:"tasks"`
	}
	bodyJSON(t, qResp, &queue)
	if len(queue.Tasks) != 1 {
		t.Fatalf("review queue: %d tasks", len(queue.Tasks))
	}
	mustPost(t, l.consultant, base+"/review",
		map[string]any{"decision": "request_changes", "note": "handle BOM"},
		l.consCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusChangesRequested {
		t.Fatalf("after request_changes: %s", got)
	}

	// developer resumes and resubmits; consultant approves with checklist
	mustPost(t, l.developer, base+"/start", map[string]any{}, l.devCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.developer, base+"/submit-review", map[string]any{}, l.devCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.consultant, base+"/review", map[string]any{
		"decision": "approve", "note": "nice",
		"checklist": []map[string]any{
			{"criterion": "imports valid rows", "ok": true},
			{"criterion": "reports bad rows", "ok": true},
		},
	}, l.consCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusApproved {
		t.Fatalf("after approve: %s", got)
	}

	// immutable bountyAwards row exists with the frozen amount
	var award store.BountyAward
	if err := l.st.DB.Collection("bountyAwards").FindOne(t.Context(),
		bson.M{"taskId": l.task.ID}).Decode(&award); err != nil {
		t.Fatalf("award row: %v", err)
	}
	if award.DeveloperID != l.devUser.ID || award.Amount != 250 || award.Coefficient != 0.25 {
		t.Fatalf("award: %+v", award)
	}

	// the review checklist landed on the timeline (§11.18)
	fresh, _ = l.st.TaskByID(t.Context(), l.task.ID)
	var checklistOK bool
	for _, e := range fresh.Timeline {
		if e.Event == "approved" && e.Data["checklist"] != nil {
			checklistOK = true
		}
	}
	if !checklistOK {
		t.Error("timeline missing approval checklist")
	}

	// developer got the approval notification
	notifs, _ := l.st.ListNotifications(t.Context(), l.devUser.ID, false, "", 50)
	var approvedNotif bool
	for _, n := range notifs {
		if n.Kind == "approved" {
			approvedNotif = true
		}
	}
	if !approvedNotif {
		t.Error("developer missing approval notification")
	}

	// approved task is immutable
	resp = patchJSON(t, l.consultant, base, map[string]any{"budget": 9999.0}, l.consCSRF)
	if resp.StatusCode != http.StatusConflict {
		t.Fatalf("edit after approve: %d, want 409", resp.StatusCode)
	}
	resp.Body.Close()
}

func TestDeclineWithdrawUnassignAbandon(t *testing.T) {
	l := newLifecycleStack(t, nil)
	base := l.ts.URL + "/api/v1/tasks/" + l.task.ID
	mustPost(t, l.consultant, base+"/publish", map[string]any{}, l.consCSRF, http.StatusOK).Body.Close()

	// claim + consultant declines → back to published, dev notified
	mustPost(t, l.developer, base+"/claim", map[string]string{"note": ""}, l.devCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.consultant, base+"/decline-claim",
		map[string]string{"developerId": l.devUser.ID}, l.consCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusPublished {
		t.Fatalf("after decline: %s", got)
	}
	notifs, _ := l.st.ListNotifications(t.Context(), l.devUser.ID, false, "", 50)
	var declined bool
	for _, n := range notifs {
		if n.Kind == "claim_declined" {
			declined = true
		}
	}
	if !declined {
		t.Error("declined developer was not notified")
	}

	// claim + withdraw → back to published
	mustPost(t, l.developer, base+"/claim", map[string]string{}, l.devCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.developer, base+"/claim/withdraw", map[string]any{}, l.devCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusPublished {
		t.Fatalf("after withdraw: %s", got)
	}

	// assign → unassign by consultant → published again
	mustPost(t, l.developer, base+"/claim", map[string]string{}, l.devCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.consultant, base+"/approve-claim",
		map[string]string{"developerId": l.devUser.ID}, l.consCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.consultant, base+"/unassign", map[string]any{}, l.consCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusPublished {
		t.Fatalf("after unassign: %s", got)
	}
	fresh, _ := l.st.TaskByID(t.Context(), l.task.ID)
	if fresh.Assignee != nil {
		t.Fatalf("assignee not cleared: %+v", fresh.Assignee)
	}

	// assign again → developer abandons mid-progress → published
	mustPost(t, l.developer, base+"/claim", map[string]string{}, l.devCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.consultant, base+"/approve-claim",
		map[string]string{"developerId": l.devUser.ID}, l.consCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.developer, base+"/start", map[string]any{}, l.devCSRF, http.StatusNoContent).Body.Close()
	mustPost(t, l.developer, base+"/abandon", map[string]any{}, l.devCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusPublished {
		t.Fatalf("after abandon: %s", got)
	}
}

// TestBoardVisibilityIsCustomerBased: a developer pooled by consultant A
// sees tasks published by consultant B on the same customer (§4.4 — all
// consultants of a customer manage its tasks).
func TestBoardVisibilityIsCustomerBased(t *testing.T) {
	l := newLifecycleStack(t, nil)

	// second consultant on the same customer publishes their own task
	bc := newClient(t)
	consB := registerUser(t, l.ts.URL, bc, "lc-cons-b@example.com", "Cons B")
	promote(t, l.st, consB.ID, map[string]bool{"consultant": true})
	if _, err := l.st.DB.Collection("customers").UpdateOne(t.Context(),
		bson.M{"_id": l.customerID},
		bson.M{"$push": bson.M{"consultantIds": consB.ID}}); err != nil {
		t.Fatal(err)
	}
	taskB := &domain.Task{
		CustomerID: l.customerID, ConsultantID: consB.ID,
		Origin: domain.OriginSubdivided, Status: domain.StatusAtomized,
		Title: "Task owned by consultant B", EffortCoefficient: 0.5, Budget: 1000, Bounty: 500,
	}
	if err := l.st.InsertTask(t.Context(), taskB); err != nil {
		t.Fatal(err)
	}
	bCSRF := csrfFrom(t, bc, l.ts.URL)
	mustPost(t, bc, l.ts.URL+"/api/v1/tasks/"+taskB.ID+"/publish", map[string]any{}, bCSRF, http.StatusOK).Body.Close()

	// the developer is pooled ONLY by consultant A, yet sees B's task
	resp, err := l.developer.Get(l.ts.URL + "/api/v1/board")
	if err != nil {
		t.Fatal(err)
	}
	var board struct {
		Tasks []domain.Task `json:"tasks"`
	}
	bodyJSON(t, resp, &board)
	found := false
	for _, tk := range board.Tasks {
		if tk.ID == taskB.ID {
			found = true
		}
	}
	if !found {
		t.Fatalf("developer pooled by consultant A cannot see consultant B's task on the same customer: %+v", board.Tasks)
	}

	// and can claim it
	mustPost(t, l.developer, l.ts.URL+"/api/v1/tasks/"+taskB.ID+"/claim",
		map[string]string{"note": "cross-consultant"}, l.devCSRF, http.StatusNoContent).Body.Close()
}

func TestDeveloperOutsidePoolSeesNothing(t *testing.T) {
	l := newLifecycleStack(t, nil)
	base := l.ts.URL + "/api/v1/tasks/" + l.task.ID
	mustPost(t, l.consultant, base+"/publish", map[string]any{}, l.consCSRF, http.StatusOK).Body.Close()

	stranger := newClient(t)
	registerUser(t, l.ts.URL, stranger, "stranger@example.com", "Stranger")
	strangerCSRF := csrfFrom(t, stranger, l.ts.URL)

	resp, err := stranger.Get(l.ts.URL + "/api/v1/board")
	if err != nil {
		t.Fatal(err)
	}
	var board struct {
		Tasks []domain.Task `json:"tasks"`
	}
	bodyJSON(t, resp, &board)
	if len(board.Tasks) != 0 {
		t.Fatalf("stranger sees %d tasks", len(board.Tasks))
	}
	resp = postJSON(t, stranger, base+"/claim", map[string]string{}, strangerCSRF)
	if resp.StatusCode != http.StatusForbidden {
		t.Fatalf("stranger claim: %d", resp.StatusCode)
	}
	resp.Body.Close()
}

func TestAIAssignmentAndCallback(t *testing.T) {
	const wpToken = "test-wp-token-abc"

	// fake work performer + artifact host
	artifact := []byte("diff --git a/x b/x\n+fixed\n")
	var fake *httptest.Server
	fake = httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case r.Method == "POST" && r.URL.Path == "/v1/jobs":
			if r.Header.Get("Authorization") != "Bearer "+wpToken {
				http.Error(w, "bad token", http.StatusUnauthorized)
				return
			}
			w.Header().Set("Content-Type", "application/json")
			w.WriteHeader(http.StatusAccepted)
			json.NewEncoder(w).Encode(map[string]string{"jobId": "wp_test_1", "status": "queued"})
		case r.URL.Path == "/healthz":
			w.WriteHeader(http.StatusOK)
		case r.URL.Path == "/artifacts/patch.diff":
			w.Write(artifact)
		default:
			http.NotFound(w, r)
		}
	}))
	defer fake.Close()

	l := newLifecycleStack(t, map[string]string{"WORK_PERFORMER_TOKEN": wpToken})
	l.srv.SetPerformerClient(workperform.New(func() string { return fake.URL }, wpToken, 5*time.Second))

	base := l.ts.URL + "/api/v1/tasks/" + l.task.ID
	mustPost(t, l.consultant, base+"/publish", map[string]any{}, l.consCSRF, http.StatusOK).Body.Close()

	// consultant assigns to AI
	resp := mustPost(t, l.consultant, base+"/assign-ai",
		map[string]any{"context": map[string]string{"instructions": "be careful"}},
		l.consCSRF, http.StatusAccepted)
	var accepted struct {
		JobID string `json:"jobId"`
	}
	bodyJSON(t, resp, &accepted)
	if accepted.JobID != "wp_test_1" {
		t.Fatalf("jobId = %q", accepted.JobID)
	}
	if got := l.taskStatus(t); got != domain.StatusAssigned {
		t.Fatalf("after assign-ai: %s", got)
	}

	// the service calls back with an HMAC-signed result
	cb := workperform.Callback{
		JobID: "wp_test_1", TaskID: l.task.ID, Status: "succeeded",
		Summary: "Implemented the importer", Log: "ran fine",
	}
	cb.Artifacts = []struct {
		Name string `json:"name"`
		URL  string `json:"url"`
	}{{Name: "patch.diff", URL: fake.URL + "/artifacts/patch.diff"}}
	body, _ := json.Marshal(cb)

	post := func(sig string) *http.Response {
		req, _ := http.NewRequest(http.MethodPost,
			l.ts.URL+"/api/v1/internal/work-results", bytes.NewReader(body))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("X-Signature", sig)
		resp, err := http.DefaultClient.Do(req)
		if err != nil {
			t.Fatal(err)
		}
		return resp
	}

	// wrong signature rejected
	r1 := post("deadbeef")
	if r1.StatusCode != http.StatusUnauthorized {
		t.Fatalf("bad signature: %d", r1.StatusCode)
	}
	r1.Body.Close()

	// valid signature moves the task to in_review with ingested artifact
	r2 := post(workperform.Sign(wpToken, body))
	if r2.StatusCode != http.StatusOK {
		t.Fatalf("callback: %d", r2.StatusCode)
	}
	r2.Body.Close()
	if got := l.taskStatus(t); got != domain.StatusInReview {
		t.Fatalf("after callback: %s", got)
	}
	fresh, _ := l.st.TaskByID(t.Context(), l.task.ID)
	var stored *domain.TaskAttachment
	for i := range fresh.Attachments {
		if fresh.Attachments[i].Name == "patch.diff" {
			stored = &fresh.Attachments[i]
		}
	}
	if stored == nil || stored.FileID == "" {
		t.Fatalf("artifact not ingested: %+v", fresh.Attachments)
	}

	// duplicate callback is idempotent (no error, no double transition)
	r3 := post(workperform.Sign(wpToken, body))
	if r3.StatusCode != http.StatusOK {
		t.Fatalf("duplicate callback: %d", r3.StatusCode)
	}
	var dup map[string]string
	bodyJSON(t, r3, &dup)
	if dup["status"] != "duplicate_ignored" {
		t.Fatalf("duplicate callback status: %v", dup)
	}

	// consultant reviews the AI work exactly like a human's
	mustPost(t, l.consultant, base+"/review",
		map[string]any{"decision": "approve", "note": "AI did fine"},
		l.consCSRF, http.StatusNoContent).Body.Close()
	if got := l.taskStatus(t); got != domain.StatusApproved {
		t.Fatalf("after AI approve: %s", got)
	}
	// no bounty award for AI assignees
	n, _ := l.st.DB.Collection("bountyAwards").CountDocuments(t.Context(), bson.M{"taskId": l.task.ID})
	if n != 0 {
		t.Fatalf("AI task produced %d award rows, want 0", n)
	}
}