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package main

// The editor's API.
//
// Two properties are worth a test rather than an inspection. The block routes
// answer with the whole list after anything that can reorder, which is what
// lets the editor never compute a position; and a draft that has been sent is
// read-only on the server, not merely in the browser, because it is the record
// of what went out.

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strconv"
	"testing"
)

// makeDraft stores a draft with the given blocks and returns it.
func makeDraft(t *testing.T, s *server, blocks ...draftBlock) *draft {
	t.Helper()
	d := &draft{
		Subject: "Re: the thing",
		Blocks:  blocks,
		Recipients: map[string]recipientSet{
			setSender: {Name: setSender, To: []Recipient{testRecipient(t, "klara@example.org")}},
		},
	}
	if err := createDraft(s.db.Write, d); err != nil {
		t.Fatalf("create draft: %v", err)
	}
	return d
}

func testRecipient(t *testing.T, addr string) Recipient {
	t.Helper()
	r, err := parseRecipient(addr)
	if err != nil {
		t.Fatalf("parse recipient: %v", err)
	}
	return r
}

// do performs a request against the routing table and returns the recorder.
func do(t *testing.T, mux *http.ServeMux, method, path string, body any) *httptest.ResponseRecorder {
	t.Helper()
	var rdr *bytes.Reader
	if body != nil {
		raw, err := json.Marshal(body)
		if err != nil {
			t.Fatalf("marshal: %v", err)
		}
		rdr = bytes.NewReader(raw)
	} else {
		rdr = bytes.NewReader(nil)
	}
	rec := httptest.NewRecorder()
	mux.ServeHTTP(rec, httptest.NewRequest(method, path, rdr))
	return rec
}

func decodeDraft(t *testing.T, rec *httptest.ResponseRecorder) draftJSON {
	t.Helper()
	var d draftJSON
	if err := json.Unmarshal(rec.Body.Bytes(), &d); err != nil {
		t.Fatalf("decode: %v (body %q)", err, rec.Body.String())
	}
	return d
}

func TestDraftAPIBlocks(t *testing.T) {
	accountName = "test"
	myAddress = "me@example.org"
	myAddresses = map[string]bool{myAddress: true}

	s := newTestServer(t)
	mux := s.routes()
	d := makeDraft(t,
		s,
		draftBlock{Kind: blockText, Content: "first"},
		draftBlock{Kind: blockText, Content: "second"},
	)
	base := "/api/drafts/" + d.Token

	// Reading it back gives the blocks in order, and says it is plain text.
	got := decodeDraft(t, do(t, mux, "GET", base, nil))
	if len(got.Blocks) != 2 || got.Blocks[0].Content != "first" {
		t.Fatalf("unexpected blocks: %+v", got.Blocks)
	}
	if got.Rich {
		t.Error("a draft of prose should not be rich")
	}

	// Adding a code block answers with the whole list, and flips the format:
	// the wire shape is derived from the contents rather than chosen.
	after := do(t, mux, "POST", base+"/blocks",
		map[string]any{"kind": blockCode, "after": 1})
	if after.Code != 200 {
		t.Fatalf("create block: %d %s", after.Code, after.Body)
	}
	withCode := decodeDraft(t, after)
	if len(withCode.Blocks) != 3 {
		t.Fatalf("want 3 blocks, got %d", len(withCode.Blocks))
	}
	if !withCode.Rich {
		t.Error("a draft holding a code listing must be sent as MIME")
	}

	// An unknown kind is the client's error, not a 500.
	if rec := do(t, mux, "POST", base+"/blocks",
		map[string]any{"kind": "haiku"}); rec.Code != 400 {
		t.Errorf("unknown kind: got %d, want 400", rec.Code)
	}

	// Moving answers with the list, renumbered densely from zero.
	last := withCode.Blocks[2]
	moved := decodeDraft(t, do(t, mux, "POST",
		base+"/blocks/"+itoa(last.ID)+"/move", map[string]any{"position": 0}))
	if moved.Blocks[0].ID != last.ID {
		t.Errorf("move: block %d should be first, got %d", last.ID, moved.Blocks[0].ID)
	}
	for i, b := range moved.Blocks {
		if b.Position != i {
			t.Errorf("positions must be dense: block %d at %d, want %d", b.ID, b.Position, i)
		}
	}

	// Editing text answers ok and no list, because it cannot reorder anything
	// and runs while somebody is typing.
	rec := do(t, mux, "PATCH", base+"/blocks/"+itoa(moved.Blocks[1].ID),
		map[string]any{"content": "edited", "meta": map[string]string{}})
	if rec.Code != 200 {
		t.Fatalf("patch: %d %s", rec.Code, rec.Body)
	}
	var ok map[string]bool
	if err := json.Unmarshal(rec.Body.Bytes(), &ok); err != nil || !ok["ok"] {
		t.Errorf("patch should answer {ok:true}, got %q", rec.Body.String())
	}
	if reread := decodeDraft(t, do(t, mux, "GET", base, nil)); reread.Blocks[1].Content != "edited" {
		t.Errorf("edit did not persist: %q", reread.Blocks[1].Content)
	}

	// Deleting closes the gap.
	deleted := decodeDraft(t, do(t, mux, "DELETE", base+"/blocks/"+itoa(last.ID), nil))
	if len(deleted.Blocks) != 2 {
		t.Errorf("want 2 blocks after delete, got %d", len(deleted.Blocks))
	}
	for i, b := range deleted.Blocks {
		if b.Position != i {
			t.Errorf("delete left a gap: block %d at %d, want %d", b.ID, b.Position, i)
		}
	}

	// A block belonging to no draft, and a block id from another draft, are
	// both "not in this draft".
	other := makeDraft(t, s, draftBlock{Kind: blockText, Content: "elsewhere"})
	otherBlocks := decodeDraft(t, do(t, mux, "GET", "/api/drafts/"+other.Token, nil))
	if rec := do(t, mux, "PATCH", base+"/blocks/"+itoa(otherBlocks.Blocks[0].ID),
		map[string]any{"content": "x"}); rec.Code != 404 {
		t.Errorf("cross-draft edit: got %d, want 404", rec.Code)
	}
}

// TestDraftAPIQuoteAttributionIsNotEditable checks that the line naming who
// wrote a quoted passage cannot be rewritten through the API.
//
// It is body text that goes to every recipient, it came out of a From: header,
// and the draft page shows it precisely so that what is displayed and what will
// be sent cannot differ. A request that could change it could make those two
// disagree.
func TestDraftAPIQuoteAttributionIsNotEditable(t *testing.T) {
	s := newTestServer(t)
	mux := s.routes()
	d := makeDraft(t, s, draftBlock{
		Kind:    blockQuote,
		Content: "their words",
		Meta: blockMeta{
			Attribution: "On 2026-08-27 12:00, Klara <klara@example.org> wrote:",
			QuoteFrom:   "klara@example.org",
			QuoteName:   "Klara",
		},
	})
	base := "/api/drafts/" + d.Token
	blocks := decodeDraft(t, do(t, mux, "GET", base, nil))

	do(t, mux, "PATCH", base+"/blocks/"+itoa(blocks.Blocks[0].ID), map[string]any{
		"content": "their words",
		"meta":    map[string]string{"attribution": "On 2026-08-27, Somebody Else wrote:"},
	})

	after := decodeDraft(t, do(t, mux, "GET", base, nil))
	if got := after.Blocks[0].Meta.Attribution; got != blocks.Blocks[0].Meta.Attribution {
		t.Errorf("attribution was rewritten to %q", got)
	}
	if got := after.Blocks[0].Meta.QuoteFrom; got != "klara@example.org" {
		t.Errorf("quote origin was rewritten to %q", got)
	}
}

// TestDraftAPISentIsReadOnly checks that a sent draft refuses every write.
//
// A sent draft is the record of what went out. Editing it would make that
// record disagree with the mail people received, so the refusal is here and not
// only in the browser, which is a courtesy to whoever is looking at the page.
func TestDraftAPISentIsReadOnly(t *testing.T) {
	s := newTestServer(t)
	mux := s.routes()
	d := makeDraft(t, s, draftBlock{Kind: blockText, Content: "went out"})
	base := "/api/drafts/" + d.Token
	blocks := decodeDraft(t, do(t, mux, "GET", base, nil))
	blockID := itoa(blocks.Blocks[0].ID)

	if err := markDraftSent(s.db.Write, d.ID, "<abc@example.org>"); err != nil {
		t.Fatalf("mark sent: %v", err)
	}

	// Reading is still allowed: that is what "kept as the record" means.
	if rec := do(t, mux, "GET", base, nil); rec.Code != 200 {
		t.Errorf("a sent draft must still be readable: %d", rec.Code)
	} else if !decodeDraft(t, rec).Sent {
		t.Error("a sent draft should say so")
	}

	for _, c := range []struct {
		method, path string
		body         any
	}{
		{"PATCH", base, map[string]any{"subject": "new"}},
		{"POST", base + "/blocks", map[string]any{"kind": blockText}},
		{"PATCH", base + "/blocks/" + blockID, map[string]any{"content": "x"}},
		{"POST", base + "/blocks/" + blockID + "/move", map[string]any{"position": 0}},
		{"DELETE", base + "/blocks/" + blockID, nil},
	} {
		rec := do(t, mux, c.method, c.path, c.body)
		if rec.Code != http.StatusConflict {
			t.Errorf("%s %s on a sent draft: got %d, want 409",
				c.method, c.path, rec.Code)
		}
	}

	// And nothing was written.
	after := decodeDraft(t, do(t, mux, "GET", base, nil))
	if len(after.Blocks) != 1 || after.Blocks[0].Content != "went out" {
		t.Errorf("a refused write changed the draft: %+v", after.Blocks)
	}
	if after.Subject != "Re: the thing" {
		t.Errorf("subject was changed to %q", after.Subject)
	}
}

// TestDraftAPIUnknownToken checks that the API discloses no more than the page
// does: a token naming nothing is 404, exactly as a discarded one is.
func TestDraftAPIUnknownToken(t *testing.T) {
	mux := newTestServer(t).routes()
	for _, path := range []string{
		"/api/drafts/nosuchtoken",
		"/api/drafts/nosuchtoken/blocks",
	} {
		method := "GET"
		if path != "/api/drafts/nosuchtoken" {
			method = "POST"
		}
		if rec := do(t, mux, method, path, map[string]any{"kind": blockText}); rec.Code != 404 {
			t.Errorf("%s %s: got %d, want 404", method, path, rec.Code)
		}
	}
}

// TestDraftsByParent checks the lookup the listings use to show a reply in
// progress beside the message it answers.
func TestDraftsByParent(t *testing.T) {
	s := newTestServer(t)

	first := &draft{ParentID: 42, Subject: "Re: one",
		Blocks: []draftBlock{{Kind: blockText}}}
	if err := createDraft(s.db.Write, first); err != nil {
		t.Fatalf("create: %v", err)
	}
	second := &draft{ParentID: 42, Subject: "Re: one again",
		Blocks: []draftBlock{{Kind: blockText}}}
	if err := createDraft(s.db.Write, second); err != nil {
		t.Fatalf("create: %v", err)
	}
	elsewhere := &draft{ParentID: 99, Subject: "Re: other",
		Blocks: []draftBlock{{Kind: blockText}}}
	if err := createDraft(s.db.Write, elsewhere); err != nil {
		t.Fatalf("create: %v", err)
	}

	got, err := draftsByParent(s.db.Read, []int64{42})
	if err != nil {
		t.Fatalf("drafts by parent: %v", err)
	}
	// Both drafts against 42, and nothing from another message.
	if len(got[42]) != 2 {
		t.Errorf("want 2 drafts for message 42, got %d", len(got[42]))
	}
	if len(got[99]) != 0 {
		t.Errorf("message 99 was not asked about, got %d", len(got[99]))
	}

	// A sent draft drops out: what it belongs beside is the copy in the Sent
	// mailbox, which the mirror holds as a message of its own.
	if err := markDraftSent(s.db.Write, first.ID, "<x@example.org>"); err != nil {
		t.Fatalf("mark sent: %v", err)
	}
	got, err = draftsByParent(s.db.Read, []int64{42})
	if err != nil {
		t.Fatalf("drafts by parent: %v", err)
	}
	if len(got[42]) != 1 || got[42][0].ID != second.ID {
		t.Errorf("a sent draft should not be listed: %+v", got[42])
	}

	// No ids is no query and no rows, rather than a malformed IN ().
	if empty, err := draftsByParent(s.db.Read, nil); err != nil || len(empty) != 0 {
		t.Errorf("empty id list: %v, %+v", err, empty)
	}
}

func itoa(n int64) string { return strconv.FormatInt(n, 10) }