// ====================================================================
// FILE: composables/useDatasetFormSubmission.ts
// ====================================================================

import { Ref } from 'vue';
import type { Dataset, License } from '@/Dataset';
import { InertiaForm } from '@inertiajs/vue3';
import { stardust } from '@eidellev/adonis-stardust/client';
import { notify } from '@/notiwind';

interface SubmissionOptions {
    onSuccess?: (updatedDataset: Dataset) => void;
    onError?: (errors: any) => void;
    showNotification?: boolean;
}

export function useDatasetFormSubmission(
    form: InertiaForm<Dataset>, 
    originalDataset: Ref<Dataset>
) {
    /**
     * Check if object has id attribute (type guard)
     */
    const hasIdAttribute = (obj: License | number): obj is License => {
        return typeof obj === 'object' && 'id' in obj;
    };

    /**
     * Transform licenses for submission
     */
    const transformLicenses = (): string[] => {
        return form.licenses.map((obj) => {
            if (hasIdAttribute(obj)) {
                return obj.id.toString();
            }
            return String(obj);
        });
    };

    /**
     * Validate form before submission
     */
    const validateForm = (): { valid: boolean; errors: string[] } => {
        const errors: string[] = [];

        // Required field validations
        if (!form.language) {
            errors.push('Language is required');
        }
        if (!form.type) {
            errors.push('Dataset type is required');
        }
        if (!form.creating_corporation) {
            errors.push('Creating corporation is required');
        }
        if (!form.titles || !form.titles[0]?.value) {
            errors.push('Main title is required');
        }
        if (!form.descriptions || !form.descriptions[0]?.value) {
            errors.push('Main abstract is required');
        }

        return {
            valid: errors.length === 0,
            errors,
        };
    };

    /**
     * Handle successful submission
     */
    const handleSubmitSuccess = (
        updatedDataset: Dataset, 
        showNotification: boolean = true
    ) => {
        // Clear deletion arrays
        if (updatedDataset.subjectsToDelete) {
            updatedDataset.subjectsToDelete = [];
        }
        if (updatedDataset.referencesToDelete) {
            updatedDataset.referencesToDelete = [];
        }

        // Update form with fresh data from server
        Object.keys(updatedDataset).forEach((key) => {
            if (key !== 'licenses' && key in form) {
                form[key] = updatedDataset[key];
            }
        });

        // Clear form errors
        form.clearErrors();

        // Update original dataset reference
        originalDataset.value = JSON.parse(JSON.stringify(updatedDataset));

        // Show success notification
        if (showNotification) {
            notify(
                {
                    type: 'success',
                    title: 'Success',
                    text: 'Dataset updated successfully',
                },
                4000,
            );
        }
    };

    /**
     * Handle submission errors
     */
    const handleSubmitError = (errors: any) => {
        console.error('Submission errors:', errors);

        notify(
            {
                type: 'error',
                title: 'Error',
                text: 'Failed to update dataset. Please check the form for errors.',
            },
            5000,
        );
    };

    /**
     * Submit form with auto-save behavior
     */
    const submitWithAutoSave = async (
        options: SubmissionOptions = {}
    ): Promise<void> => {
        try {
            const route = stardust.route('editor.dataset.update', [form.id]);
            const licenses = transformLicenses();

            await form
                .transform((data) => ({
                    ...data,
                    licenses,
                    rights: 'true',
                }))
                .put(route, {
                    onSuccess: (page) => {
                        const updatedDataset = page.props.dataset || form.data();
                        handleSubmitSuccess(
                            updatedDataset, 
                            options.showNotification ?? true
                        );

                        if (options.onSuccess) {
                            options.onSuccess(updatedDataset);
                        }
                    },
                    onError: (errors) => {
                        handleSubmitError(errors);

                        if (options.onError) {
                            options.onError(errors);
                        }
                    },
                });
        } catch (error) {
            console.error('Unexpected error during submission:', error);
            notify(
                {
                    type: 'error',
                    title: 'Error',
                    text: 'An unexpected error occurred. Please try again.',
                },
                5000,
            );
        }
    };

    /**
     * Standard submit with validation
     */
    const submit = async (
        options: SubmissionOptions = {}
    ): Promise<void> => {
        // Validate form first
        const validation = validateForm();
        if (!validation.valid) {
            notify(
                {
                    type: 'error',
                    title: 'Validation Error',
                    text: validation.errors.join(', '),
                },
                5000,
            );
            return;
        }

        await submitWithAutoSave({
            ...options,
            showNotification: true,
        });
    };

    /**
     * Silent submit without notification (for auto-save)
     */
    const submitSilently = async (): Promise<void> => {
        await submitWithAutoSave({
            showNotification: false,
        });
    };

    return {
        submit,
        submitWithAutoSave,
        submitSilently,
        validateForm,
        transformLicenses,
    };
}