package gateway

import (
	"encoding/json"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/auth"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/config/runtimeconfig"
)

// This file covers the admin half of the channel-level role binding (design/22 §2
// 方案 b / §4.4): PUT /admin/channels/{platform}/config accepts personaId through the
// existing read-modify-write + bridge.Reload path, an unknown role is refused
// instead of binding a role that cannot answer, and the list endpoint reports the
// binding back.

// TestAdminSaveChannelConfigPersonaID saves a channel role, asserts it reached
// channels.json and the list wire shape, then clears it.
func TestAdminSaveChannelConfigPersonaID(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	store := &stubChannelConfigStore{path: path, accounts: map[string][]config.ChannelAccount{}}
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{Channels: store, Personas: personaTestRegistry(t)})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodPut, ts.URL+"/api/v1/admin/channels/telegram/config",
		map[string]any{"id": "conf0", "token": "bot-tok", "personaId": "yuki"}, tok)
	if resp.StatusCode != http.StatusCreated {
		t.Fatalf("save status = %d, want 201 (body=%s)", resp.StatusCode, body)
	}
	accounts, warn := runtimeconfig.LoadChannels(path, nil)
	if warn != nil {
		t.Fatalf("load channels warn = %v", warn)
	}
	if len(accounts["telegram"]) != 1 || accounts["telegram"][0].PersonaID != "yuki" {
		t.Fatalf("channels.json telegram = %+v, want personaId yuki", accounts["telegram"])
	}
	if len(store.reloaded) != 1 || store.reloaded[0] != "telegram" {
		t.Fatalf("reloaded = %v, want [telegram] (the panel's hot-reload path)", store.reloaded)
	}

	// The list endpoint reports the binding so the panel can render it.
	var listed []struct {
		Name     string `json:"name"`
		Accounts []struct {
			ID        string `json:"id"`
			PersonaID string `json:"personaId"`
		} `json:"accounts"`
	}
	_, gBody := doReq(t, http.MethodGet, ts.URL+"/api/v1/admin/channels", nil, tok)
	if err := json.Unmarshal(decodeBody(t, gBody)["data"], &listed); err != nil {
		t.Fatalf("decode channels list: %v (body=%s)", err, gBody)
	}
	var accts []struct {
		ID        string `json:"id"`
		PersonaID string `json:"personaId"`
	}
	for _, entry := range listed {
		if entry.Name == "telegram" {
			accts = entry.Accounts
		}
	}
	if len(accts) != 1 || accts[0].PersonaID != "yuki" {
		t.Fatalf("GET /admin/channels telegram accounts = %+v, want personaId yuki (body=%s)", accts, gBody)
	}

	// Saving the same account without a personaId unbinds it.
	resp, body = doReq(t, http.MethodPut, ts.URL+"/api/v1/admin/channels/telegram/config",
		map[string]any{"id": "conf0", "token": "bot-tok"}, tok)
	if resp.StatusCode != http.StatusCreated {
		t.Fatalf("unbind status = %d, want 201 (body=%s)", resp.StatusCode, body)
	}
	accounts, _ = runtimeconfig.LoadChannels(path, nil)
	if len(accounts["telegram"]) != 1 || accounts["telegram"][0].PersonaID != "" {
		t.Fatalf("after unbind = %+v, want personaId cleared", accounts["telegram"])
	}
}

// TestAdminSaveChannelConfigRejectsUnknownPersonaID keeps the save fail-closed: a
// channel bound to a role the library does not know would silently answer as the
// default role, so it is refused and nothing is written or reloaded.
func TestAdminSaveChannelConfigRejectsUnknownPersonaID(t *testing.T) {
	t.Parallel()
	path := filepath.Join(t.TempDir(), "channels.json")
	store := &stubChannelConfigStore{path: path, accounts: map[string][]config.ChannelAccount{}}
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{Channels: store, Personas: personaTestRegistry(t)})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodPut, ts.URL+"/api/v1/admin/channels/telegram/config",
		map[string]any{"id": "conf0", "token": "bot-tok", "personaId": "nobody"}, tok)
	if resp.StatusCode != http.StatusBadRequest {
		t.Fatalf("unknown personaId status = %d, want 400 (body=%s)", resp.StatusCode, body)
	}
	if !strings.Contains(string(body), "personaId") {
		t.Fatalf("rejection body = %s, want it to name personaId", body)
	}
	if len(store.reloaded) != 0 {
		t.Fatalf("reloaded = %v, want none for a refused save", store.reloaded)
	}
	if _, err := os.Stat(path); !os.IsNotExist(err) {
		t.Fatalf("a refused save must not write channels.json (stat err = %v)", err)
	}
}