package api_test

import (
	"bytes"
	"database/sql"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/syonad/clonepack/config"
	"github.com/syonad/clonepack/internal/api"
	"github.com/syonad/clonepack/internal/core"
	"github.com/syonad/clonepack/internal/store"
)

// testServer wires up a full in-memory stack and returns an httptest.Server.
func newTestServer(t *testing.T) (*httptest.Server, *sql.DB) {
	t.Helper()
	db, err := store.Open(config.DBConfig{Path: ":memory:"})
	if err != nil {
		t.Fatalf("open db: %v", err)
	}
	t.Cleanup(func() { db.Close() })

	dataDir := t.TempDir()

	repoStore    := store.NewRepoStore(db)
	jobStore      := store.NewCloneJobStore(db)
	pendingStore  := store.NewPendingPackageStore(db)
	blockedStore  := store.NewBlockedPackageStore(db)
	snapshotStore := store.NewSnapshotStore(db)

	repoSvc     := core.NewRepoService(repoStore, dataDir)
	cloneSvc    := core.NewCloneService(repoStore, jobStore, dataDir)
	snapshotSvc := core.NewSnapshotService(snapshotStore, repoStore, dataDir)
	syncSvc     := core.NewSyncService(repoStore, pendingStore, blockedStore, cloneSvc, snapshotSvc, dataDir)

	router := api.NewRouter(
		api.NewRepoHandler(repoSvc),
		api.NewCloneHandler(cloneSvc),
		api.NewSyncHandler(syncSvc),
		api.NewSnapshotHandler(snapshotSvc),
		api.NewProxyHandler(repoSvc, dataDir),
	)

	srv := httptest.NewServer(router)
	t.Cleanup(srv.Close)
	return srv, db
}

func do(t *testing.T, method, url string, body any) *http.Response {
	t.Helper()
	var buf bytes.Buffer
	if body != nil {
		json.NewEncoder(&buf).Encode(body)
	}
	req, err := http.NewRequest(method, url, &buf)
	if err != nil {
		t.Fatalf("new request: %v", err)
	}
	if body != nil {
		req.Header.Set("Content-Type", "application/json")
	}
	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		t.Fatalf("%s %s: %v", method, url, err)
	}
	return resp
}

func decodeJSON(t *testing.T, resp *http.Response, v any) {
	t.Helper()
	defer resp.Body.Close()
	if err := json.NewDecoder(resp.Body).Decode(v); err != nil {
		t.Fatalf("decode response: %v", err)
	}
}

// --- Health ---

func TestHealth(t *testing.T) {
	srv, _ := newTestServer(t)
	resp := do(t, http.MethodGet, srv.URL+"/health", nil)
	if resp.StatusCode != http.StatusOK {
		t.Errorf("health: got %d, want 200", resp.StatusCode)
	}
}

// --- Create repo ---

func TestCreateRepo_rpm(t *testing.T) {
	srv, _ := newTestServer(t)

	payload := map[string]any{
		"name":       "rocky9",
		"type":       "rpm",
		"source_url": "https://download.rockylinux.org/pub/rocky/9/BaseOS/x86_64/os",
	}
	resp := do(t, http.MethodPost, srv.URL+"/api/v1/repos", payload)
	if resp.StatusCode != http.StatusCreated {
		t.Fatalf("create rpm: got %d, want 201", resp.StatusCode)
	}

	var repo api.RepoResponse
	decodeJSON(t, resp, &repo)
	if repo.ID <= 0 {
		t.Errorf("expected positive ID, got %d", repo.ID)
	}
	if repo.Name != "rocky9" {
		t.Errorf("Name: got %q, want rocky9", repo.Name)
	}
	if repo.SyncMode != "auto" {
		t.Errorf("SyncMode default: got %q, want auto", repo.SyncMode)
	}
}

func TestCreateRepo_apt(t *testing.T) {
	srv, _ := newTestServer(t)

	payload := map[string]any{
		"name":              "debian-bookworm",
		"type":              "apt",
		"source_url":        "https://deb.debian.org/debian",
		"apt_suite":         "bookworm",
		"apt_components":    []string{"main", "contrib"},
		"apt_architectures": []string{"amd64"},
	}
	resp := do(t, http.MethodPost, srv.URL+"/api/v1/repos", payload)
	if resp.StatusCode != http.StatusCreated {
		t.Fatalf("create apt: got %d, want 201", resp.StatusCode)
	}

	var repo api.RepoResponse
	decodeJSON(t, resp, &repo)
	if repo.AptSuite != "bookworm" {
		t.Errorf("AptSuite: got %q, want bookworm", repo.AptSuite)
	}
	if len(repo.AptComponents) != 2 {
		t.Errorf("AptComponents: got %v", repo.AptComponents)
	}
}

func TestCreateRepo_invalidType(t *testing.T) {
	srv, _ := newTestServer(t)
	resp := do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "bad", "type": "maven", "source_url": "https://x.com",
	})
	if resp.StatusCode != http.StatusUnprocessableEntity {
		t.Errorf("invalid type: got %d, want 422", resp.StatusCode)
	}
	resp.Body.Close()
}

func TestCreateRepo_aptMissingSuite(t *testing.T) {
	srv, _ := newTestServer(t)
	resp := do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "apt-no-suite", "type": "apt", "source_url": "https://deb.debian.org/debian",
	})
	if resp.StatusCode != http.StatusUnprocessableEntity {
		t.Errorf("missing suite: got %d, want 422", resp.StatusCode)
	}
	resp.Body.Close()
}

func TestCreateRepo_invalidJSON(t *testing.T) {
	srv, _ := newTestServer(t)
	req, _ := http.NewRequest(http.MethodPost, srv.URL+"/api/v1/repos", bytes.NewBufferString("not-json"))
	req.Header.Set("Content-Type", "application/json")
	resp, _ := http.DefaultClient.Do(req)
	if resp.StatusCode != http.StatusBadRequest {
		t.Errorf("bad json: got %d, want 400", resp.StatusCode)
	}
	resp.Body.Close()
}

// --- List repos ---

func TestListRepos_empty(t *testing.T) {
	srv, _ := newTestServer(t)
	resp := do(t, http.MethodGet, srv.URL+"/api/v1/repos", nil)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("list: got %d, want 200", resp.StatusCode)
	}
	var body api.ListReposResponse
	decodeJSON(t, resp, &body)
	if body.Total != 0 {
		t.Errorf("expected 0 repos, got %d", body.Total)
	}
}

func TestListRepos_afterCreate(t *testing.T) {
	srv, _ := newTestServer(t)

	do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "repo-a", "type": "rpm", "source_url": "https://a.com",
	}).Body.Close()
	do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "repo-b", "type": "rpm", "source_url": "https://b.com",
	}).Body.Close()

	resp := do(t, http.MethodGet, srv.URL+"/api/v1/repos", nil)
	var body api.ListReposResponse
	decodeJSON(t, resp, &body)
	if body.Total != 2 {
		t.Errorf("expected 2 repos, got %d", body.Total)
	}
}

// --- Get repo ---

func TestGetRepo(t *testing.T) {
	srv, _ := newTestServer(t)

	createResp := do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "rocky9", "type": "rpm", "source_url": "https://example.com",
	})
	var created api.RepoResponse
	decodeJSON(t, createResp, &created)

	resp := do(t, http.MethodGet, srv.URL+"/api/v1/repos/1", nil)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("get: got %d, want 200", resp.StatusCode)
	}
	var repo api.RepoResponse
	decodeJSON(t, resp, &repo)
	if repo.ID != created.ID {
		t.Errorf("ID: got %d, want %d", repo.ID, created.ID)
	}
}

func TestGetRepo_notFound(t *testing.T) {
	srv, _ := newTestServer(t)
	resp := do(t, http.MethodGet, srv.URL+"/api/v1/repos/999", nil)
	if resp.StatusCode != http.StatusNotFound {
		t.Errorf("not found: got %d, want 404", resp.StatusCode)
	}
	resp.Body.Close()
}

// --- Update repo ---

func TestUpdateRepo_sourceURL(t *testing.T) {
	srv, _ := newTestServer(t)

	do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "rocky9", "type": "rpm", "source_url": "https://old.example.com",
	}).Body.Close()

	resp := do(t, http.MethodPatch, srv.URL+"/api/v1/repos/1", map[string]any{
		"source_url": "https://new.example.com",
	})
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("update: got %d, want 200", resp.StatusCode)
	}
	var repo api.RepoResponse
	decodeJSON(t, resp, &repo)
	if repo.SourceURL != "https://new.example.com" {
		t.Errorf("SourceURL: got %q", repo.SourceURL)
	}
}

func TestUpdateRepo_aptConfig(t *testing.T) {
	srv, _ := newTestServer(t)

	do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "debian", "type": "apt", "source_url": "https://deb.debian.org/debian",
		"apt_suite": "bookworm",
	}).Body.Close()

	resp := do(t, http.MethodPatch, srv.URL+"/api/v1/repos/1", map[string]any{
		"apt_components": []string{"main", "contrib", "non-free"},
	})
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("update apt: got %d, want 200", resp.StatusCode)
	}
	var repo api.RepoResponse
	decodeJSON(t, resp, &repo)
	if len(repo.AptComponents) != 3 {
		t.Errorf("AptComponents: got %v", repo.AptComponents)
	}
}

func TestUpdateRepo_notFound(t *testing.T) {
	srv, _ := newTestServer(t)
	resp := do(t, http.MethodPatch, srv.URL+"/api/v1/repos/999", map[string]any{
		"source_url": "https://x.com",
	})
	if resp.StatusCode != http.StatusNotFound {
		t.Errorf("not found: got %d, want 404", resp.StatusCode)
	}
	resp.Body.Close()
}

// --- Delete repo ---

func TestDeleteRepo(t *testing.T) {
	srv, _ := newTestServer(t)

	do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "to-delete", "type": "rpm", "source_url": "https://example.com",
	}).Body.Close()

	resp := do(t, http.MethodDelete, srv.URL+"/api/v1/repos/1", nil)
	if resp.StatusCode != http.StatusNoContent {
		t.Fatalf("delete: got %d, want 204", resp.StatusCode)
	}
	resp.Body.Close()

	resp = do(t, http.MethodGet, srv.URL+"/api/v1/repos/1", nil)
	if resp.StatusCode != http.StatusNotFound {
		t.Errorf("after delete: got %d, want 404", resp.StatusCode)
	}
	resp.Body.Close()
}

func TestDeleteRepo_notFound(t *testing.T) {
	srv, _ := newTestServer(t)
	resp := do(t, http.MethodDelete, srv.URL+"/api/v1/repos/999", nil)
	if resp.StatusCode != http.StatusNotFound {
		t.Errorf("not found: got %d, want 404", resp.StatusCode)
	}
	resp.Body.Close()
}

// --- Sync ---

func TestSyncTrigger_notFound(t *testing.T) {
	srv, _ := newTestServer(t)
	resp := do(t, http.MethodPost, srv.URL+"/api/v1/repos/999/sync/trigger", nil)
	if resp.StatusCode != http.StatusNotFound {
		t.Errorf("sync trigger not found: got %d, want 404", resp.StatusCode)
	}
	resp.Body.Close()
}

func TestSyncListPending_empty(t *testing.T) {
	srv, _ := newTestServer(t)
	do(t, http.MethodPost, srv.URL+"/api/v1/repos", map[string]any{
		"name": "rpm-repo", "type": "rpm", "source_url": "https://example.com",
	}).Body.Close()

	resp := do(t, http.MethodGet, srv.URL+"/api/v1/repos/1/sync/pending", nil)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("sync pending: got %d, want 200", resp.StatusCode)
	}
	var body struct {
		Total int `json:"total"`
	}
	decodeJSON(t, resp, &body)
	if body.Total != 0 {
		t.Errorf("expected empty pending list, got total=%d", body.Total)
	}
}