package handlers

import (
	"encoding/json"
	"io"
	"testing"
	"time"

	"amnezia-share/internal/config"
	"amnezia-share/internal/models"
	"amnezia-share/internal/share"
	"amnezia-share/internal/web"
)

// TestRenderAllPages executes every page template against a realistic view
// struct (as built by the real handlers) without needing a database. It
// catches execution-time template errors (bad field/method names, nil
// dereferences) that plain `go build` and template parsing cannot catch.
func TestRenderAllPages(t *testing.T) {
	tmpl, err := web.LoadTemplates(config.Config{WebDir: "../../../web"})
	if err != nil {
		t.Fatalf("LoadTemplates: %v", err)
	}

	now := time.Now()
	future := now.Add(48 * time.Hour)
	note := "test note"
	linkID := 7
	email := "user@example.com"
	validityDays := 30

	serverInfo := models.ServerInfo{ID: 1, Label: "Germany", Protocols: []string{"wireguard", "awg2"}, Flag: "de", Speed: "1 Gbps"}

	sampleLink := models.ShareLink{
		ID: 1, Token: "abc123", MaxUses: 5, UseCount: 2, CreatedAt: now,
		ExpiresAt: &future, ValidityDays: &validityDays,
		AllowedServerIDs: json.RawMessage(`[1,2]`),
	}

	bundle := share.Bundle{
		Base:           "peer1",
		Conf:           &share.FilePart{Filename: "peer1.conf", Body: "conf-body", Mime: "text/plain"},
		Vpn:            &share.FilePart{Filename: "peer1.vpn", Body: "vpn-body", Mime: "text/plain"},
		CreationID:     42,
		CreatedAt:      now,
		Protocol:       "wireguard",
		ConnectionName: "peer1",
		ServerID:       1,
	}

	adminUser := &models.User{ID: 1, Username: "admin"}

	cases := []struct {
		name string
		data any
	}{
		{"page_install", installView{}},
		{"page_install", installView{Installed: true}},
		{"page_install", installView{Error: "test error"}},
		{"page_login", loginView{PocketEnabled: true, NoAdmins: false}},
		{"page_login", loginView{Error: "bad creds", NoAdmins: true}},
		{"page_cabinet_auth", cabinetAuthView{}},
		{"page_cabinet_auth", cabinetAuthView{Error: "bad creds"}},
		{"page_cabinet", cabinetView{
			Member:           &models.Member{ID: 1, Username: "member1", Email: &email, CreatedAt: now},
			Sub:              &models.MemberSubscription{MemberID: 1, ExpiresAt: &future, MaxConfigs: 5, ConfigCount: 2},
			SubLabel:         "до " + future.Format("2006-01-02"),
			ConfigsRemaining: 3,
			Servers:          []models.ServerInfo{serverInfo},
			Bundles:          []share.Bundle{bundle},
			OK:               "ok message",
		}},
		{"page_cabinet", cabinetView{
			Member: &models.Member{ID: 1, Username: "member1", CreatedAt: now},
			Error:  "some error",
		}},
		{"page_share", shareView{Token: "abc123", NotFound: true}},
		{"page_share", shareView{
			Token:   "abc123",
			Link:    &sampleLink,
			Servers: []models.ServerInfo{serverInfo},
			Bundles: []share.Bundle{bundle},
			OK:      "created",
		}},
		{"page_share", shareView{
			Token:        "abc123",
			Link:         &sampleLink,
			Servers:      []models.ServerInfo{serverInfo},
			Expired:      true,
			LimitReached: true,
			Error:        "some error",
		}},
		{"page_faq", faqView{Items: []faqEntry{{Question: "Q1", Answer: "A1"}}}},
		{"page_rules", nil},
		{"page_status", statusView{Servers: []serverStatus{{ServerInfo: serverInfo, Alive: true, Ms: 42}, {ServerInfo: serverInfo, Alive: false, Err: "timeout"}}}},
		{"page_admin_index", adminIndexView{
			adminLayout: adminLayout{Admin: adminUser, Active: "index"},
			TotalLinks:  10, ActiveLinks: 5, ExpiredLinks: 2, CleanedLinks: 1, LimitLinks: 2,
			CodesCount: 3, PanelURL: "https://panel.example.com", PanelOK: true, Maintenance: false,
		}},
		{"page_admin_index", adminIndexView{
			adminLayout: adminLayout{Admin: adminUser, Active: "index"},
			PanelErr:    "connection refused",
		}},
		{"page_admin_links", adminLinksView{
			adminLayout:      adminLayout{Admin: adminUser, Active: "links", OK: "saved"},
			StatusFilter:     "active",
			Page:             1,
			Total:            1,
			PerPage:          20,
			AllowedDurations: []int{7, 30, 90},
			Links: []linkRow{
				{ShareLink: sampleLink, Status: share.StatusActive, ActiveConfigs: 2},
			},
			Detail:           &sampleLink,
			DetailStatus:     share.StatusActive,
			Creations:        []models.ShareCreation{{ID: 42, ShareLinkID: 1, ServerID: 1, Protocol: "wireguard", ConnectionName: "peer1", CreatedAt: now}},
			DeletedCreations: []models.ShareCreation{{ID: 41, ShareLinkID: 1, ServerID: 1, Protocol: "wireguard", ConnectionName: "peer0", CreatedAt: now}},
			AllowedServerIDs: []int{1, 2},
			AllServers:       []models.ServerInfo{serverInfo},
		}},
		{"page_admin_links", adminLinksView{
			adminLayout: adminLayout{Admin: adminUser, Active: "links"},
			PerPage:     20,
		}},
		{"page_admin_renewal", adminRenewalView{
			adminLayout: adminLayout{Admin: adminUser, Active: "renewal"},
			Codes: []models.RenewalCode{
				{ID: 1, Code: "ABCD1234", AddDays: 30, MaxUses: 1, UseCount: 0, ShareLinkID: &linkID, CodeExpiresAt: &future, Note: &note, CodeTarget: "guest", CreatedAt: now},
				{ID: 2, Code: "WXYZ9999", AddDays: 30, MaxUses: 5, UseCount: 1, CodeTarget: "member", CreatedAt: now},
			},
		}},
		{"page_admin_renewal", adminRenewalView{adminLayout: adminLayout{Admin: adminUser, Active: "renewal"}}},
		{"page_admin_configs", adminConfigsView{
			adminLayout: adminLayout{Admin: adminUser, Active: "configs"},
			Rows: []configRow{
				{ShareCreation: models.ShareCreation{ID: 42, ShareLinkID: 1, ServerID: 1, Protocol: "wireguard", ConnectionName: "peer1", CreatedAt: now}, LinkID: 1, LinkToken: "abc123"},
			},
			LinkIDFilter: 1,
			Truncated:    true,
		}},
		{"page_admin_configs", adminConfigsView{adminLayout: adminLayout{Admin: adminUser, Active: "configs"}}},
		{"page_admin_servers", adminServersView{
			adminLayout:  adminLayout{Admin: adminUser, Active: "servers"},
			AllProtocols: share.GuestProtocols,
			Rows: []serverRow{
				{ID: 1, Title: "Germany", Protocols: []string{"wireguard", "awg2"}, Flag: "🇩🇪", Speed: "1 Gbps", Disabled: false, PanelName: "de-1", PanelHost: "1.2.3.4"},
				{ID: 2, Title: "France", Protocols: nil, Disabled: true},
			},
			PanelReachable: true,
		}},
		{"page_admin_servers", adminServersView{
			adminLayout:  adminLayout{Admin: adminUser, Active: "servers"},
			AllProtocols: share.GuestProtocols,
			PanelErr:     "connection refused",
		}},
		{"page_admin_settings", adminSettingsView{
			adminLayout:      adminLayout{Admin: adminUser, Active: "settings"},
			PanelURL:         "https://panel.example.com",
			APIToken:         "awp_secret",
			ServerLabelsJSON: `{"1":"Germany"}`,
			TrafficNotices:   `{}`,
			Maintenance:      true,
			PocketURL:        "https://id.example.com",
			PocketClientID:   "client-id",
			PocketSecret:     "secret",
			MemberDays:       "30",
			MemberMaxUses:    "5",
			TestResult:       "Соединение установлено. Серверов обнаружено: 3.",
		}},
		{"page_admin_settings", adminSettingsView{
			adminLayout: adminLayout{Admin: adminUser, Active: "settings"},
			TestError:   "connection refused",
		}},
	}

	for i, c := range cases {
		clone, err := tmpl.Clone()
		if err != nil {
			t.Fatalf("clone: %v", err)
		}
		if err := clone.ExecuteTemplate(io.Discard, c.name, c.data); err != nil {
			t.Errorf("case %d (%s): execute failed: %v", i, c.name, err)
		}
	}
}