package server

import (
	"encoding/json"
	"net/http"
	"testing"
	"time"

	"music-server/internal/backend"
	"music-server/internal/db"
	"music-server/internal/db/repository"

	"github.com/stretchr/testify/assert"
)

// TestSyncPopulatesDatabase verifies that sync populates the database with games
func TestSyncPopulatesDatabase(t *testing.T) {
	db.TestSetupDB(t)
	defer db.TestTearDownDB(t)

	e := StartTestServer(t)

	// Before sync - should have no games (or very few if previous test ran)
	repo := repository.New(db.Dbpool)
	gamesBefore, err := repo.FindAllGames(db.Ctx)
	assert.NoError(t, err)
	beforeCount := len(gamesBefore)
	t.Logf("Games before sync: %d", beforeCount)

	// Run sync
	resp := MakeTestRequest(t, e, "GET", "/sync/full")
	assert.Equal(t, http.StatusOK, resp.Code)

	// Wait for sync to complete by polling /sync/progress
	maxAttempts := 60
	for i := 0; i < maxAttempts; i++ {
		progressResp := MakeTestRequest(t, e, "GET", "/sync/progress")
		assert.Equal(t, http.StatusOK, progressResp.Code)

		var progress backend.ProgressResponse
		err := json.Unmarshal(progressResp.Body.Bytes(), &progress)
		assert.NoError(t, err)

		t.Logf("Sync progress: %s%% (time spent: %s)", progress.Progress, progress.TimeSpent)

		if progress.Progress == "100" {
			t.Log("Sync completed!")
			break
		}

		if i == maxAttempts-1 {
			t.Error("Sync did not complete within timeout")
		}
		time.Sleep(1 * time.Second)
	}

	// After sync - should have games
	gamesAfter, err := repo.FindAllGames(db.Ctx)
	assert.NoError(t, err)
	afterCount := len(gamesAfter)
	t.Logf("Games after sync: %d", afterCount)

	// Should have more games than before (unless database was already populated)
	assert.True(t, afterCount > 0, "Database should have games after sync")
}

// TestSyncMakesDifference verifies that sync actually changes the database state
func TestSyncMakesDifference(t *testing.T) {
	db.TestSetupDB(t)
	defer db.TestTearDownDB(t)

	e := StartTestServer(t)

	// Clear any existing data first
	db.TestClearDatabase(t)

	// Before sync - should have no games
	repo := repository.New(db.Dbpool)
	gamesBefore, err := repo.FindAllGames(db.Ctx)
	assert.NoError(t, err)
	assert.Equal(t, 0, len(gamesBefore), "Should have no games before sync")

	// Run sync
	resp := MakeTestRequest(t, e, "GET", "/sync/full")
	assert.Equal(t, http.StatusOK, resp.Code)

	// Wait for sync to complete
	maxAttempts := 60
	for i := 0; i < maxAttempts; i++ {
		progressResp := MakeTestRequest(t, e, "GET", "/sync/progress")
		var progress backend.ProgressResponse
		json.Unmarshal(progressResp.Body.Bytes(), &progress)

		if progress.Progress == "100" {
			break
		}
		if i == maxAttempts-1 {
			t.Error("Sync did not complete within timeout")
		}
		time.Sleep(1 * time.Second)
	}

	// After sync - should have games
	gamesAfter, err := repo.FindAllGames(db.Ctx)
	assert.NoError(t, err)
	assert.True(t, len(gamesAfter) > 0, "Should have games after sync")
}

// TestSyncProgress verifies the sync progress endpoint
func TestSyncProgress(t *testing.T) {
	db.TestSetupDB(t)
	defer db.TestTearDownDB(t)

	e := StartTestServer(t)

	// Start sync in background
	go MakeTestRequest(t, e, "GET", "/sync/full")

	// Poll progress endpoint
	maxAttempts := 30
	foundNonZero := false
	foundComplete := false

	for i := 0; i < maxAttempts; i++ {
		resp := MakeTestRequest(t, e, "GET", "/sync/progress")
		assert.Equal(t, http.StatusOK, resp.Code)

		var progress backend.ProgressResponse
		err := json.Unmarshal(resp.Body.Bytes(), &progress)
		assert.NoError(t, err)

		t.Logf("Sync progress: %s%%", progress.Progress)

		// Verify we get valid progress values
		if progress.Progress != "0" {
			foundNonZero = true
		}
		if progress.Progress == "100" {
			foundComplete = true
			break
		}

		time.Sleep(1 * time.Second)
	}

	assert.True(t, foundNonZero, "Should have seen non-zero progress")
	assert.True(t, foundComplete, "Should have seen completion at 100%")
}

// TestSyncGamesNewOnlyChanges verifies the incremental sync endpoint
func TestSyncGamesNewOnlyChanges(t *testing.T) {
	db.TestSetupDB(t)
	defer db.TestTearDownDB(t)

	e := StartTestServer(t)

	// Run full sync first
	MakeTestRequest(t, e, "GET", "/sync/full")
	// Wait for it to complete
	time.Sleep(5 * time.Second)

	// Get initial count
	repo := repository.New(db.Dbpool)
	gamesBefore, _ := repo.FindAllGames(db.Ctx)
	beforeCount := len(gamesBefore)

	// Run incremental sync (should not change count if nothing changed)
	resp := MakeTestRequest(t, e, "GET", "/sync/new")
	assert.Equal(t, http.StatusOK, resp.Code)

	// Wait a bit
	time.Sleep(2 * time.Second)

	// Count should be the same
	gamesAfter, _ := repo.FindAllGames(db.Ctx)
	afterCount := len(gamesAfter)

	// Note: This might not be exactly equal due to timing, but should be close
	t.Logf("Games before incremental sync: %d, after: %d", beforeCount, afterCount)
}

// TestResetGames verifies the reset endpoint clears the database
// RUN THIS LAST
func TestResetGames(t *testing.T) {
	db.TestSetupDB(t)
	defer db.TestTearDownDB(t)

	e := StartTestServer(t)

	// First ensure we have data
	repo := repository.New(db.Dbpool)
	gamesBefore, _ := repo.FindAllGames(db.Ctx)
	beforeCount := len(gamesBefore)

	if beforeCount == 0 {
		// Run sync to populate
		MakeTestRequest(t, e, "GET", "/sync/full")
		time.Sleep(5 * time.Second)
		gamesBefore, _ = repo.FindAllGames(db.Ctx)
		beforeCount = len(gamesBefore)
	}

	t.Logf("Games before reset: %d", beforeCount)
	assert.True(t, beforeCount > 0, "Should have games to reset")

	// Call reset
	resp := MakeTestRequest(t, e, "GET", "/sync/reset")
	assert.Equal(t, http.StatusOK, resp.Code)

	// Verify database is cleared
	// Note: reset might take a moment to propagate
	time.Sleep(1 * time.Second)

	gamesAfter, _ := repo.FindAllGames(db.Ctx)
	afterCount := len(gamesAfter)

	t.Logf("Games after reset: %d", afterCount)
	assert.Equal(t, 0, afterCount, "Database should be empty after reset")
}

// TestSyncGamesNewFull verifies the full sync endpoint
// RUN THIS LAST (before TestResetGames)
func TestSyncGamesNewFull(t *testing.T) {
	db.TestSetupDB(t)
	defer db.TestTearDownDB(t)

	e := StartTestServer(t)

	// Clear database first
	db.TestClearDatabase(t)

	// Run full sync
	resp := MakeTestRequest(t, e, "GET", "/sync/full")
	assert.Equal(t, http.StatusOK, resp.Code)

	// Wait for sync to complete
	maxAttempts := 60
	for i := 0; i < maxAttempts; i++ {
		progressResp := MakeTestRequest(t, e, "GET", "/sync/progress")
		var progress backend.ProgressResponse
		json.Unmarshal(progressResp.Body.Bytes(), &progress)

		if progress.Progress == "100" {
			t.Log("Full sync completed")
			break
		}
		if i == maxAttempts-1 {
			t.Error("Full sync did not complete within timeout")
		}
		time.Sleep(1 * time.Second)
	}

	// Verify database is populated
	repo := repository.New(db.Dbpool)
	games, err := repo.FindAllGames(db.Ctx)
	assert.NoError(t, err)
	assert.True(t, len(games) > 0, "Database should be populated after full sync")
	t.Logf("Full sync populated %d games", len(games))
}