import { AvatarInfo, AvatarStep } from '@/components/onboarding/AvatarStep';
import { OnboardingError } from '@/components/onboarding/OnboardingError';
import { OnboardingHelpPanel } from '@/components/onboarding/OnboardingHelpPanel';
import { OnboardingPrimaryActions } from '@/components/onboarding/OnboardingPrimaryActions';
import { OnboardingShell } from '@/components/onboarding/OnboardingShell';
import { OnboardingStepPanel } from '@/components/onboarding/OnboardingStepPanel';
import { OnboardingStepper } from '@/components/onboarding/OnboardingStepper';
import { PersonalInfo, PersonalInfoStep } from '@/components/onboarding/PersonalInfoStep';
import { ViewData } from '@/lib/contracts/view-data/ViewData';
import { Box } from '@/ui/Box';
import { Stack } from '@/ui/Stack';
import { Text } from '@/ui/Text';
import { FormEvent } from 'react';

type OnboardingStep = 1 | 2;

interface FormErrors {
  [key: string]: string | undefined;
  firstName?: string;
  lastName?: string;
  displayName?: string;
  country?: string;
  facePhoto?: string;
  avatar?: string;
  submit?: string;
}

export interface OnboardingViewData extends ViewData {
  onCompleted: () => void;
  onCompleteOnboarding: (data: {
    firstName: string;
    lastName: string;
    displayName: string;
    country: string;
    timezone?: string;
  }) => Promise<{ success: boolean; error?: string }>;
  onGenerateAvatars: (params: {
    facePhotoData: string;
    suitColor: string;
  }) => Promise<{ success: boolean; data?: { success: boolean; avatarUrls?: string[]; errorMessage?: string }; error?: string }>;
  isProcessing: boolean;
  step: OnboardingStep;
  setStep: (step: OnboardingStep) => void;
  errors: FormErrors;
  setErrors: (errors: FormErrors) => void;
  personalInfo: PersonalInfo;
  setPersonalInfo: (info: PersonalInfo) => void;
  avatarInfo: AvatarInfo;
  setAvatarInfo: (info: AvatarInfo) => void;
}

interface OnboardingTemplateProps {
  viewData: OnboardingViewData;
}

export function OnboardingTemplate({ viewData }: OnboardingTemplateProps) {
  const { 
    onCompleted, 
    onCompleteOnboarding, 
    onGenerateAvatars, 
    isProcessing,
    step,
    setStep,
    errors,
    setErrors,
    personalInfo,
    setPersonalInfo,
    avatarInfo,
    setAvatarInfo
  } = viewData;

  const steps = ['Personal Info', 'Racing Avatar'];

  // Validation
  const validateStep = (currentStep: OnboardingStep): boolean => {
    const newErrors: FormErrors = {};

    if (currentStep === 1) {
      if (!personalInfo.firstName.trim()) {
        newErrors.firstName = 'First name is required';
      }
      if (!personalInfo.lastName.trim()) {
        newErrors.lastName = 'Last name is required';
      }
      if (!personalInfo.displayName.trim()) {
        newErrors.displayName = 'Display name is required';
      } else if (personalInfo.displayName.length < 3) {
        newErrors.displayName = 'Display name must be at least 3 characters';
      }
      if (!personalInfo.country) {
        newErrors.country = 'Please select your country';
      }
    }

    if (currentStep === 2) {
      if (!avatarInfo.facePhoto) {
        newErrors.facePhoto = 'Please upload a photo of your face';
      }
      if (avatarInfo.generatedAvatars.length > 0 && avatarInfo.selectedAvatarIndex === null) {
        newErrors.avatar = 'Please select one of the generated avatars';
      }
    }

    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };

  const handleNext = () => {
    const isValid = validateStep(step);
    if (isValid && step < 2) {
      setStep((step + 1) as OnboardingStep);
    }
  };

  const handleBack = () => {
    if (step > 1) {
      setStep((step - 1) as OnboardingStep);
    }
  };

  const generateAvatars = async () => {
    if (!avatarInfo.facePhoto) {
      setErrors({ ...errors, facePhoto: 'Please upload a photo first' });
      return;
    }

    setAvatarInfo({ ...avatarInfo, isGenerating: true, generatedAvatars: [], selectedAvatarIndex: null });
    const newErrors = { ...errors };
    delete newErrors.avatar;
    setErrors(newErrors);

    try {
      const result = await onGenerateAvatars({
        facePhotoData: avatarInfo.facePhoto,
        suitColor: avatarInfo.suitColor,
      });

      if (result.success && result.data?.success && result.data.avatarUrls) {
        setAvatarInfo({
          ...avatarInfo,
          generatedAvatars: result.data.avatarUrls,
          isGenerating: false,
        });
      } else {
        setErrors({ ...errors, avatar: result.data?.errorMessage || result.error || 'Failed to generate avatars' });
        setAvatarInfo({ ...avatarInfo, isGenerating: false });
      }
    } catch (error) {
      setErrors({ ...errors, avatar: 'Failed to generate avatars. Please try again.' });
      setAvatarInfo({ ...avatarInfo, isGenerating: false });
    }
  };

  const handleSubmit = async (e: FormEvent) => {
    e.preventDefault();

    if (!validateStep(2)) {
      return;
    }

    if (avatarInfo.selectedAvatarIndex === null) {
      setErrors({ ...errors, avatar: 'Please select an avatar' });
      return;
    }

    setErrors({});

    try {
      const result = await onCompleteOnboarding({
        firstName: personalInfo.firstName.trim(),
        lastName: personalInfo.lastName.trim(),
        displayName: personalInfo.displayName.trim(),
        country: personalInfo.country,
        timezone: personalInfo.timezone || undefined,
      });

      if (result.success) {
        onCompleted();
      } else {
        setErrors({ submit: result.error || 'Failed to create profile' });
      }
    } catch (error) {
      setErrors({ submit: 'Failed to create profile' });
    }
  };

  const header = (
    <Stack direction="row" align="center" justify="between">
      <Stack gap={1}>
        <Text size="xl" weight="bold" color="white" uppercase letterSpacing="tighter">
          GridPilot <Text color="primary-accent">Onboarding</Text>
        </Text>
        <Text size="xs" color="text-gray-500" uppercase letterSpacing="widest">
          System Initialization
        </Text>
      </Stack>
      <Box w="64">
        <OnboardingStepper currentStep={step} totalSteps={2} steps={steps} />
      </Box>
    </Stack>
  );

  const sidebar = (
    <Stack gap={6}>
      <OnboardingHelpPanel title="Onboarding Process">
        Welcome to GridPilot. We're setting up your racing identity. This process ensures you're ready for the track with a complete profile and a unique AI-generated avatar.
      </OnboardingHelpPanel>
      
      {step === 2 && (
        <OnboardingHelpPanel title="Avatar Generation">
          Our AI uses your photo to create a professional racing avatar. For best results, use a clear, front-facing photo with good lighting.
        </OnboardingHelpPanel>
      )}
    </Stack>
  );

  return (
    <OnboardingShell header={header} sidebar={sidebar}>
      <Box as="form" onSubmit={handleSubmit}>
        {step === 1 && (
          <OnboardingStepPanel 
            title="Personal Information" 
            description="Tell us a bit about yourself to get started."
          >
            <PersonalInfoStep
              personalInfo={personalInfo}
              setPersonalInfo={setPersonalInfo}
              errors={errors}
              loading={isProcessing}
            />
          </OnboardingStepPanel>
        )}

        {step === 2 && (
          <OnboardingStepPanel 
            title="Create Your Racing Avatar" 
            description="Upload a photo and we will generate a unique racing avatar for you."
          >
            <AvatarStep
              avatarInfo={avatarInfo}
              setAvatarInfo={setAvatarInfo}
              errors={errors}
              setErrors={setErrors}
              onGenerateAvatars={generateAvatars}
            />
          </OnboardingStepPanel>
        )}

        {errors.submit && (
          <Box mt={4}>
            <OnboardingError message={errors.submit} />
          </Box>
        )}

        <OnboardingPrimaryActions
          onBack={step > 1 ? handleBack : undefined}
          onNext={step < 2 ? handleNext : undefined}
          isLastStep={step === 2}
          canNext={step === 1 ? true : avatarInfo.selectedAvatarIndex !== null}
          isLoading={isProcessing}
          type={step === 2 ? 'submit' : 'button'}
        />
      </Box>
    </OnboardingShell>
  );
}