package storage_test

import (
	"testing"
	"time"

	"github.com/jfraeys/fetch_ml/internal/storage"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// auditTestSchema extends the base schema with task_access_log table
const auditTestSchema = `
CREATE TABLE IF NOT EXISTS jobs (
	id TEXT PRIMARY KEY,
	job_name TEXT NOT NULL,
	args TEXT,
	status TEXT NOT NULL DEFAULT 'pending',
	priority INTEGER DEFAULT 0,
	created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
	started_at DATETIME,
	ended_at DATETIME,
	worker_id TEXT,
	error TEXT,
	datasets TEXT,
	metadata TEXT,
	updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE IF NOT EXISTS task_access_log (
	id INTEGER PRIMARY KEY AUTOINCREMENT,
	task_id TEXT NOT NULL,
	user_id TEXT,
	token TEXT,
	action TEXT NOT NULL,
	accessed_at DATETIME DEFAULT CURRENT_TIMESTAMP,
	ip_address TEXT,
	FOREIGN KEY (task_id) REFERENCES jobs(id) ON DELETE CASCADE
);
`

// setupAuditTestDB creates a fresh database with audit schema for each test
func setupAuditTestDB(t *testing.T) *storage.DB {
	t.Helper()
	dbPath := t.TempDir() + "/audit_test.db"
	db, err := storage.NewDBFromPath(dbPath)
	require.NoError(t, err, "Failed to create database")

	err = db.Initialize(auditTestSchema)
	require.NoError(t, err, "Failed to initialize database schema")

	t.Cleanup(func() {
		_ = db.Close()
	})

	return db
}

// createTestJob creates a minimal job for audit testing
func createTestJobForAudit(t *testing.T, db *storage.DB, id string) *storage.Job {
	t.Helper()
	job := &storage.Job{
		ID:     id,
		Status: "pending",
	}
	err := db.CreateJob(job)
	require.NoError(t, err, "Failed to create test job")
	return job
}

// TestLogTaskAccess tests logging task access events
func TestLogTaskAccess(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)
	job := createTestJobForAudit(t, db, "audit-task-1")

	cases := []struct {
		name      string
		taskID    string
		userID    *string
		token     *string
		action    string
		ipAddress *string
		wantErr   bool
	}{
		{
			name:      "user view access",
			taskID:    job.ID,
			userID:    strPtr("user-123"),
			token:     nil,
			action:    "view",
			ipAddress: strPtr("192.168.1.1"),
			wantErr:   false,
		},
		{
			name:      "token-based clone access",
			taskID:    job.ID,
			userID:    nil,
			token:     strPtr("share-token-abc"),
			action:    "clone",
			ipAddress: strPtr("10.0.0.1"),
			wantErr:   false,
		},
		{
			name:      "execute action",
			taskID:    job.ID,
			userID:    strPtr("user-456"),
			token:     nil,
			action:    "execute",
			ipAddress: nil,
			wantErr:   false,
		},
		{
			name:      "nonexistent task",
			taskID:    "nonexistent-task",
			userID:    strPtr("user-789"),
			token:     nil,
			action:    "view",
			ipAddress: strPtr("127.0.0.1"),
			wantErr:   true,
		},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			action := tc.action // capture for pointer
			err := db.LogTaskAccess(tc.taskID, tc.userID, tc.token, &action, tc.ipAddress)
			if tc.wantErr {
				require.Error(t, err)
				return
			}
			require.NoError(t, err)
		})
	}
}

// TestGetAuditLogForTask tests retrieving audit log entries for a task
func TestGetAuditLogForTask(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)
	job := createTestJobForAudit(t, db, "audit-task-2")

	// Log multiple access events
	userID := "user-audit"
	action1 := "view"
	action2 := "clone"
	ip := "192.168.1.100"

	err := db.LogTaskAccess(job.ID, &userID, nil, &action1, &ip)
	require.NoError(t, err)

	err = db.LogTaskAccess(job.ID, &userID, nil, &action2, &ip)
	require.NoError(t, err)

	// Retrieve audit log
	entries, err := db.GetAuditLogForTask(job.ID, 10)
	require.NoError(t, err)
	require.Len(t, entries, 2, "Should have 2 audit log entries")

	// Verify entries are ordered by accessed_at DESC
	assert.Equal(t, job.ID, entries[0].TaskID)
	assert.Equal(t, action2, entries[0].Action, "Most recent entry should be first")
	assert.Equal(t, action1, entries[1].Action)

	// Verify user ID is set correctly
	require.NotNil(t, entries[0].UserID)
	assert.Equal(t, userID, *entries[0].UserID)
}

// TestGetAuditLogForTaskWithLimit tests the limit parameter
func TestGetAuditLogForTaskWithLimit(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)
	job := createTestJobForAudit(t, db, "audit-task-3")

	// Log 5 access events
	userID := "user-limit"
	action := "view"
	ip := "192.168.1.1"

	for i := 0; i < 5; i++ {
		err := db.LogTaskAccess(job.ID, &userID, nil, &action, &ip)
		require.NoError(t, err)
		time.Sleep(10 * time.Millisecond) // Ensure different timestamps
	}

	// Test with limit of 2
	entries, err := db.GetAuditLogForTask(job.ID, 2)
	require.NoError(t, err)
	assert.Len(t, entries, 2, "Should respect limit parameter")

	// Test with limit of 0 (should still return results, just limited by SQL)
	entries, err = db.GetAuditLogForTask(job.ID, 0)
	require.NoError(t, err)
	// Limit 0 in SQL may return all or none depending on implementation
	// Just verify it doesn't error
}

// TestGetAuditLogForUser tests retrieving audit log entries for a specific user
func TestGetAuditLogForUser(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)
	job1 := createTestJobForAudit(t, db, "audit-task-4a")
	job2 := createTestJobForAudit(t, db, "audit-task-4b")

	user1 := "user-specific"
	user2 := "user-other"
	action := "view"
	ip := "192.168.1.1"

	// Log access for user1 on both tasks
	err := db.LogTaskAccess(job1.ID, &user1, nil, &action, &ip)
	require.NoError(t, err)
	err = db.LogTaskAccess(job2.ID, &user1, nil, &action, &ip)
	require.NoError(t, err)

	// Log access for user2
	err = db.LogTaskAccess(job1.ID, &user2, nil, &action, &ip)
	require.NoError(t, err)

	// Get audit log for user1
	entries, err := db.GetAuditLogForUser(user1, 10)
	require.NoError(t, err)
	require.Len(t, entries, 2, "Should have 2 entries for user1")

	// Verify both tasks are in the results
	taskIDs := make(map[string]bool)
	for _, e := range entries {
		taskIDs[e.TaskID] = true
		assert.Equal(t, user1, *e.UserID)
	}
	assert.True(t, taskIDs[job1.ID], "Should include job1")
	assert.True(t, taskIDs[job2.ID], "Should include job2")
}

// TestGetAuditLogForToken tests retrieving audit log by token
func TestGetAuditLogForToken(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)
	job := createTestJobForAudit(t, db, "audit-task-5")

	token1 := "token-abc-123"
	token2 := "token-def-456"
	action := "clone"
	ip := "10.0.0.1"

	// Log 2 accesses with token1
	err := db.LogTaskAccess(job.ID, nil, &token1, &action, &ip)
	require.NoError(t, err)
	err = db.LogTaskAccess(job.ID, nil, &token1, &action, &ip)
	require.NoError(t, err)

	// Log 1 access with token2
	err = db.LogTaskAccess(job.ID, nil, &token2, &action, &ip)
	require.NoError(t, err)

	// Get audit log for token1
	entries, err := db.GetAuditLogForToken(token1, 10)
	require.NoError(t, err)
	require.Len(t, entries, 2, "Should have 2 entries for token1")

	for _, e := range entries {
		require.NotNil(t, e.Token)
		assert.Equal(t, token1, *e.Token)
	}
}

// TestDeleteOldAuditLogs tests cleanup of old audit log entries
func TestDeleteOldAuditLogs(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)
	job := createTestJobForAudit(t, db, "audit-task-6")

	// Log some access events
	userID := "user-cleanup"
	action := "view"
	ip := "192.168.1.1"

	for i := 0; i < 3; i++ {
		err := db.LogTaskAccess(job.ID, &userID, nil, &action, &ip)
		require.NoError(t, err)
	}

	// Count before deletion
	countBefore, err := db.CountAuditLogs()
	require.NoError(t, err)
	assert.Equal(t, int64(3), countBefore)

	// Delete logs older than 0 days (should delete all)
	deleted, err := db.DeleteOldAuditLogs(0)
	require.NoError(t, err)
	assert.Equal(t, int64(3), deleted, "Should delete all 3 entries")

	// Verify count is 0
	countAfter, err := db.CountAuditLogs()
	require.NoError(t, err)
	assert.Equal(t, int64(0), countAfter)
}

// TestCountAuditLogs tests counting total audit log entries
func TestCountAuditLogs(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)

	// Count when empty
	count, err := db.CountAuditLogs()
	require.NoError(t, err)
	assert.Equal(t, int64(0), count)

	// Add some entries
	job1 := createTestJobForAudit(t, db, "audit-task-7a")
	job2 := createTestJobForAudit(t, db, "audit-task-7b")

	userID := "user-count"
	action := "view"
	ip := "192.168.1.1"

	err = db.LogTaskAccess(job1.ID, &userID, nil, &action, &ip)
	require.NoError(t, err)
	err = db.LogTaskAccess(job2.ID, &userID, nil, &action, &ip)
	require.NoError(t, err)

	// Count again
	count, err = db.CountAuditLogs()
	require.NoError(t, err)
	assert.Equal(t, int64(2), count)
}

// TestGetOldestAuditLogDate tests retrieving the oldest audit log date
func TestGetOldestAuditLogDate(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)

	// When empty, should return nil
	date, err := db.GetOldestAuditLogDate()
	require.NoError(t, err)
	assert.Nil(t, date)

	// Add an entry
	job := createTestJobForAudit(t, db, "audit-task-8")
	userID := "user-date"
	action := "view"
	ip := "192.168.1.1"

	beforeLog := time.Now().UTC()
	err = db.LogTaskAccess(job.ID, &userID, nil, &action, &ip)
	require.NoError(t, err)
	afterLog := time.Now().UTC()

	// Get oldest date
	date, err = db.GetOldestAuditLogDate()
	require.NoError(t, err)
	require.NotNil(t, date)

	// Verify the date is within expected range (allow 1 second tolerance for test execution time)
	assert.WithinDuration(t, beforeLog, *date, time.Second, "Date should be close to current time")
	assert.WithinDuration(t, afterLog, *date, time.Second, "Date should be close to current time")
}

// TestAuditLogWithNilValues tests handling of NULL values in audit log
func TestAuditLogWithNilValues(t *testing.T) {
	t.Parallel()

	db := setupAuditTestDB(t)
	job := createTestJobForAudit(t, db, "audit-task-9")

	action := "view"
	err := db.LogTaskAccess(job.ID, nil, nil, &action, nil)
	require.NoError(t, err)

	// Retrieve and verify
	entries, err := db.GetAuditLogForTask(job.ID, 10)
	require.NoError(t, err)
	require.Len(t, entries, 1)

	entry := entries[0]
	assert.Nil(t, entry.UserID)
	assert.Nil(t, entry.Token)
	assert.Nil(t, entry.IPAddress)
	assert.Equal(t, "view", entry.Action)
}

// Helper function to get string pointer
func strPtr(s string) *string {
	return &s
}