package web

import (
	"context"
	"net/http"
	"net/url"
	"strings"
	"testing"

	"sourcecraft.dev/bigbes/sr-ht-dolt/browse"
	"sourcecraft.dev/bigbes/sr-ht-dolt/core"
)

// --- fixtures ----------------------------------------------------------------

// beadsTables is a schema fingerprint that Applies should accept: issues (with
// id + status) + dependencies both present.
func beadsTables() []browse.TableInfo {
	return []browse.TableInfo{
		{Name: "issues", Columns: []browse.ColumnInfo{
			{Name: "id", PrimaryKey: true}, {Name: "status"},
		}},
		{Name: "dependencies", Columns: []browse.ColumnInfo{{Name: "id", PrimaryKey: true}}},
		{Name: "labels"},
	}
}

// beadsFixture wires a fakeSession whose per-table Rows model a small parade:
//   - i-open   : open, ready         → Lined Up
//   - i-prog   : in_progress         → Rolling
//   - i-done   : closed              → Past Stand
//   - i-blocked: open, blocked by i-open (a "blocks" dep to a non-closed target)
//     and also carries is_blocked=1  → Stalled
//
// The issues page deliberately orders its columns id,title,status,priority,...
// with is_blocked LAST so column-name mapping (not positional) is exercised.
func beadsFixture() *fakeSession {
	issues := &browse.RowPage{
		// Column order chosen so nothing is at a "natural" index; is_blocked is last.
		Columns: []string{"id", "title", "status", "priority", "issue_type", "assignee", "created_at", "is_blocked"},
		Rows: [][]string{
			{"i-open", "Ready to roll", "open", "1", "feature", "alice", "2024-01-01", "0"},
			{"i-prog", "Under way", "in_progress", "0", "bug", "bob", "2024-01-02", "0"},
			{"i-done", "Finished", "closed", "2", "chore", "carol", "2024-01-03", "0"},
			{"i-blocked", "Waiting", "open", "1", "feature", "dave", "2024-01-04", "1"},
		},
		Total: 4,
	}
	// i-blocked depends on i-open (blocks, target open → keeps it Stalled).
	// i-open is depended on by i-blocked → i-open.Blocks == 1.
	deps := &browse.RowPage{
		Columns: []string{"id", "issue_id", "depends_on_issue_id", "type"},
		Rows: [][]string{
			{"d1", "i-blocked", "i-open", "blocks"},
		},
		Total: 1,
	}
	labels := &browse.RowPage{
		Columns: []string{"issue_id", "label"},
		Rows: [][]string{
			{"i-open", "backend"},
			{"i-open", "urgent"},
		},
		Total: 2,
	}
	statuses := &browse.RowPage{
		Columns: []string{"name", "category"},
		Rows: [][]string{
			{"open", "open"},
			{"in_progress", "in_progress"},
			{"closed", "closed"},
		},
		Total: 3,
	}
	comments := &browse.RowPage{
		Columns: []string{"issue_id", "author", "text", "created_at"},
		Rows: [][]string{
			{"i-open", "alice", "first!", "2024-01-05"},
			{"i-prog", "bob", "not this one", "2024-01-06"},
		},
		Total: 2,
	}
	return &fakeSession{
		branches: []browse.Branch{{Name: "main", Head: "abcdef1234567890"}},
		tables:   beadsTables(),
		rowsByTable: map[string]*browse.RowPage{
			"issues":          issues,
			"dependencies":    deps,
			"labels":          labels,
			"custom_statuses": statuses,
			"comments":        comments,
		},
	}
}

// laneBySlug finds a lane in a built board by its slug.
func laneBySlug(d *BeadsData, slug string) *BeadsLane {
	for i := range d.Lanes {
		if d.Lanes[i].Slug == slug {
			return &d.Lanes[i]
		}
	}
	return nil
}

// cardIDs lists the ids of a lane's cards.
func cardIDs(l *BeadsLane) []string {
	if l == nil {
		return nil
	}
	out := make([]string, len(l.Issues))
	for i, c := range l.Issues {
		out[i] = c.ID
	}
	return out
}

// --- Applies -----------------------------------------------------------------

func TestBeadsApplies(t *testing.T) {
	v := &beadsView{}
	if !v.Applies(beadsTables()) {
		t.Fatalf("Applies should be true when issues+dependencies (with id+status) present")
	}
	// Missing dependencies → not a beads DB.
	if v.Applies([]browse.TableInfo{
		{Name: "issues", Columns: []browse.ColumnInfo{{Name: "id"}, {Name: "status"}}},
	}) {
		t.Fatalf("Applies should be false without a dependencies table")
	}
	// issues present but lacking status column → guard rejects.
	if v.Applies([]browse.TableInfo{
		{Name: "issues", Columns: []browse.ColumnInfo{{Name: "id"}}},
		{Name: "dependencies"},
	}) {
		t.Fatalf("Applies should be false when issues lacks a status column")
	}
	// Unrelated schema.
	if v.Applies([]browse.TableInfo{{Name: "widgets"}}) {
		t.Fatalf("Applies should be false for an unrelated schema")
	}
}

// --- board mode --------------------------------------------------------------

func TestBeadsBuildBoardLanes(t *testing.T) {
	v := &beadsView{}
	got, err := v.Build(context.Background(), beadsFixture(), &core.Repo{OwnerName: "alice", Name: "db"}, "main", url.Values{})
	if err != nil {
		t.Fatalf("Build: %v", err)
	}
	d, ok := got.(*BeadsData)
	if !ok {
		t.Fatalf("Build returned %T, want *BeadsData", got)
	}
	if d.Mode != "board" {
		t.Fatalf("Mode = %q, want board", d.Mode)
	}

	checks := map[string][]string{
		"rolling":    {"i-prog"},
		"lined-up":   {"i-open"},
		"stalled":    {"i-blocked"},
		"past-stand": {"i-done"},
	}
	for slug, want := range checks {
		got := cardIDs(laneBySlug(d, slug))
		if strings.Join(got, ",") != strings.Join(want, ",") {
			t.Errorf("lane %s = %v, want %v", slug, got, want)
		}
	}

	if d.Counts.Rolling != 1 || d.Counts.LinedUp != 1 || d.Counts.Stalled != 1 || d.Counts.PastStand != 1 {
		t.Errorf("counts = %+v, want 1 each", d.Counts)
	}
	if d.Counts.Total != 4 || d.Total != 4 {
		t.Errorf("total = %d/%d, want 4", d.Counts.Total, d.Total)
	}
}

func TestBeadsBuildBoardCounts(t *testing.T) {
	v := &beadsView{}
	got, _ := v.Build(context.Background(), beadsFixture(), &core.Repo{OwnerName: "a", Name: "b"}, "main", url.Values{})
	d := got.(*BeadsData)

	// i-blocked depends on i-open → i-blocked.BlockedBy==1, i-open.Blocks==1.
	blocked := laneBySlug(d, "stalled").Issues[0]
	if blocked.ID != "i-blocked" || blocked.BlockedBy != 1 || blocked.Blocks != 0 {
		t.Errorf("i-blocked = %+v, want BlockedBy=1 Blocks=0", blocked)
	}
	open := laneBySlug(d, "lined-up").Issues[0]
	if open.ID != "i-open" || open.Blocks != 1 || open.BlockedBy != 0 {
		t.Errorf("i-open = %+v, want Blocks=1 BlockedBy=0", open)
	}
	// Labels attach by issue_id.
	if strings.Join(open.Labels, ",") != "backend,urgent" {
		t.Errorf("i-open labels = %v, want [backend urgent]", open.Labels)
	}
}

// TestBeadsBlockedByDepOnly proves the dependency-derived block signal works
// even when is_blocked is not set: an issue with a "blocks" dep to a non-closed
// target lands in Stalled; the same dep to a CLOSED target does not.
func TestBeadsBlockedByDepOnly(t *testing.T) {
	sess := &fakeSession{
		tables: beadsTables(),
		rowsByTable: map[string]*browse.RowPage{
			"issues": {
				Columns: []string{"id", "status", "is_blocked"},
				Rows: [][]string{
					{"a", "open", "0"},   // blocked by open b → Stalled
					{"b", "open", "0"},   // ready → Lined Up
					{"c", "open", "0"},   // "blocked" by closed d → NOT stalled → Lined Up
					{"d", "closed", "0"}, // Past Stand
				},
				Total: 4,
			},
			"dependencies": {
				Columns: []string{"issue_id", "depends_on_issue_id", "type"},
				Rows: [][]string{
					{"a", "b", "blocks"},
					{"c", "d", "blocks"},
				},
				Total: 2,
			},
		},
	}
	v := &beadsView{}
	got, err := v.Build(context.Background(), sess, &core.Repo{OwnerName: "a", Name: "b"}, "main", url.Values{})
	if err != nil {
		t.Fatalf("Build: %v", err)
	}
	d := got.(*BeadsData)
	if ids := cardIDs(laneBySlug(d, "stalled")); strings.Join(ids, ",") != "a" {
		t.Errorf("stalled = %v, want [a] (blocked by open dep only)", ids)
	}
	if ids := cardIDs(laneBySlug(d, "lined-up")); strings.Join(ids, ",") != "b,c" {
		t.Errorf("lined-up = %v, want [b c] (c's blocker is closed)", ids)
	}
}

// --- detail mode -------------------------------------------------------------

func TestBeadsBuildDetail(t *testing.T) {
	v := &beadsView{}
	q := url.Values{}
	q.Set("issue", "i-open")
	got, err := v.Build(context.Background(), beadsFixture(), &core.Repo{OwnerName: "a", Name: "b"}, "main", q)
	if err != nil {
		t.Fatalf("Build: %v", err)
	}
	d := got.(*BeadsData)
	if d.Mode != "detail" {
		t.Fatalf("Mode = %q, want detail", d.Mode)
	}
	if d.Issue == nil || d.Issue.ID != "i-open" || d.Issue.Title != "Ready to roll" {
		t.Fatalf("Issue = %+v, want i-open/Ready to roll", d.Issue)
	}
	if strings.Join(d.Issue.Labels, ",") != "backend,urgent" {
		t.Errorf("labels = %v", d.Issue.Labels)
	}
	// i-open is depended on by i-blocked (incoming), and depends on nothing.
	if len(d.DependsOn) != 0 {
		t.Errorf("DependsOn = %v, want none", d.DependsOn)
	}
	if len(d.DependedOnBy) != 1 || d.DependedOnBy[0].IssueID != "i-blocked" {
		t.Errorf("DependedOnBy = %+v, want [i-blocked]", d.DependedOnBy)
	}
	// Only i-open's comment shows in its thread.
	if len(d.Comments) != 1 || d.Comments[0].Author != "alice" || d.Comments[0].Text != "first!" {
		t.Errorf("Comments = %+v, want single alice comment", d.Comments)
	}
}

func TestBeadsBuildDetailOutgoingEdge(t *testing.T) {
	v := &beadsView{}
	q := url.Values{}
	q.Set("issue", "i-blocked")
	got, _ := v.Build(context.Background(), beadsFixture(), &core.Repo{OwnerName: "a", Name: "b"}, "main", q)
	d := got.(*BeadsData)
	if len(d.DependsOn) != 1 || d.DependsOn[0].IssueID != "i-open" || d.DependsOn[0].Title != "Ready to roll" {
		t.Fatalf("DependsOn = %+v, want [i-open/Ready to roll]", d.DependsOn)
	}
	if d.DependsOn[0].Type != "blocks" || d.DependsOn[0].Closed {
		t.Errorf("edge = %+v, want type=blocks not-closed", d.DependsOn[0])
	}
}

// --- end to end --------------------------------------------------------------

func TestBeadsHandleViewBoard(t *testing.T) {
	h := newHarness(t)
	h.store.add(&core.Repo{Name: "db", OwnerID: 1, OwnerName: "alice", Path: "/d", Visibility: core.VisibilityPublic})
	h.browse.sess = beadsFixture()
	setViews(t, h, &beadsView{})

	rec := h.do("GET", "/~alice/db/view/beads", nil, nil)
	if rec.Code != http.StatusOK {
		t.Fatalf("board: got %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	body := rec.Body.String()
	for _, want := range []string{"Rolling", "Lined Up", "Stalled", "Past Stand", "Ready to roll", "beads-summary"} {
		if !strings.Contains(body, want) {
			t.Errorf("board body missing %q", want)
		}
	}
	// The Tables tab must remain reachable from the view.
	if !strings.Contains(body, "/~alice/db/tree/") {
		t.Errorf("board missing Tables tab link; body=%s", body)
	}
}

func TestBeadsHandleViewDetail(t *testing.T) {
	h := newHarness(t)
	h.store.add(&core.Repo{Name: "db", OwnerID: 1, OwnerName: "alice", Path: "/d", Visibility: core.VisibilityPublic})
	h.browse.sess = beadsFixture()
	setViews(t, h, &beadsView{})

	rec := h.do("GET", "/~alice/db/view/beads?issue=i-blocked", nil, nil)
	if rec.Code != http.StatusOK {
		t.Fatalf("detail: got %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	body := rec.Body.String()
	if !strings.Contains(body, "Waiting") {
		t.Errorf("detail missing issue title; body=%s", body)
	}
	if !strings.Contains(body, "Depends on") || !strings.Contains(body, "i-open") {
		t.Errorf("detail missing dependency edge; body=%s", body)
	}
	if !strings.Contains(body, "Back to the parade") {
		t.Errorf("detail missing back link; body=%s", body)
	}
}