import { useCallback } from 'react';
import { useEditor } from '@craftjs/core';
import { useEditorConfig } from '../state/EditorConfigContext';
import { usePages } from '../state/PageContext';
import { exportBodyHtml } from '../utils/html-export';

export function useWhpApi() {
  const { query, actions } = useEditor();
  const { whpConfig, isWHP } = useEditorConfig();
  const { pages, headerPage, footerPage, activePageId, setHeaderCraftState, setFooterCraftState, setPagesCraftState } = usePages();

  const save = useCallback(async () => {
    if (!isWHP || !whpConfig) return null;

    // Serialize the current canvas state (whatever page is active)
    const currentCraftState = query.serialize();

    // Export body HTML for the current page
    let currentHtml = '';
    let css = '';
    try {
      const result = exportBodyHtml(currentCraftState);
      currentHtml = result.html;
      css = result.css;
    } catch (e) {
      console.error('HTML export failed, saving state only:', e);
    }

    // Export header HTML from its craft state
    let headerHtml = '';
    try {
      if (headerPage.craftState) {
        const hResult = exportBodyHtml(headerPage.craftState);
        headerHtml = hResult.html;
      }
    } catch (e) {
      console.error('Header HTML export failed:', e);
    }

    // Export footer HTML from its craft state
    let footerHtml = '';
    try {
      if (footerPage.craftState) {
        const fResult = exportBodyHtml(footerPage.craftState);
        footerHtml = fResult.html;
      }
    } catch (e) {
      console.error('Footer HTML export failed:', e);
    }

    // Build the pages array with HTML for each page
    // For the active page, use the freshly exported HTML from the canvas;
    // for others, export from their stored craft state
    const pagesPayload = pages.map((page) => {
      const filename = (page.slug === 'index' ? 'index' : page.slug) + '.html';
      let pageHtml = '';

      if (page.id === activePageId) {
        // Active page: use the current canvas HTML (already exported above)
        pageHtml = currentHtml;
      } else if (page.craftState) {
        try {
          const pResult = exportBodyHtml(page.craftState);
          pageHtml = pResult.html;
        } catch (e) {
          console.error(`HTML export failed for page ${page.name}:`, e);
        }
      }

      return {
        filename,
        title: page.name,
        html: pageHtml,
      };
    });

    // Build pages_craft_state array: for each page, store its craft state
    // For the currently active page, always use the fresh canvas state (currentCraftState)
    // since page.craftState may be stale (not updated until page switch)
    const pagesGrapesjs = pages.map((page) => ({
      id: page.id,
      name: page.name,
      slug: page.slug,
      craftState: page.id === activePageId ? currentCraftState : (page.craftState || null),
    }));

    const payload = {
      site_id: whpConfig.siteId,
      name: whpConfig.siteName,
      html: currentHtml,
      css,
      pages: pagesPayload,
      header_html: headerHtml,
      footer_html: footerHtml,
      craft_state: currentCraftState,
      header_craft_state: headerPage.craftState || null,
      footer_craft_state: footerPage.craftState || null,
      pages_craft_state: pagesGrapesjs,
    };

    const resp = await fetch(`${whpConfig.apiUrl}?action=save`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'X-CSRF-Token': whpConfig.csrfToken,
      },
      body: JSON.stringify(payload),
    });
    return resp.json();
  }, [isWHP, whpConfig, query, pages, activePageId, headerPage, footerPage]);

  const publish = useCallback(async () => {
    if (!isWHP || !whpConfig) return null;

    // First save to ensure staging is up to date
    await save();

    // Then publish from staging to live
    const resp = await fetch(
      `${whpConfig.apiUrl}?action=publish&site_id=${whpConfig.siteId}`,
      {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'X-CSRF-Token': whpConfig.csrfToken,
        },
        body: JSON.stringify({ site_id: whpConfig.siteId }),
      },
    );
    return resp.json();
  }, [isWHP, whpConfig, save]);

  const load = useCallback(async () => {
    if (!isWHP || !whpConfig) return null;

    const resp = await fetch(
      `${whpConfig.apiUrl}?action=load&site_id=${whpConfig.siteId}`,
    );
    const data = await resp.json();

    if (data.success && data.project) {
      const proj = data.project;

      // Restore header craft state
      if (proj.header_craft_state) {
        setHeaderCraftState(typeof proj.header_craft_state === 'string'
          ? proj.header_craft_state : JSON.stringify(proj.header_craft_state));
      }

      // Restore footer craft state
      if (proj.footer_craft_state) {
        setFooterCraftState(typeof proj.footer_craft_state === 'string'
          ? proj.footer_craft_state : JSON.stringify(proj.footer_craft_state));
      }

      // Restore pages and load the first page into the canvas
      if (proj.pages_craft_state && Array.isArray(proj.pages_craft_state) && proj.pages_craft_state.length > 0) {
        setPagesCraftState(proj.pages_craft_state.map((p: { id: string; name: string; slug: string; craftState: string | null }) => ({
          id: p.id, name: p.name, slug: p.slug, craftState: p.craftState || null,
        })));

        // Load the first page (home) into the canvas
        const firstPage = proj.pages_craft_state[0];
        if (firstPage.craftState) {
          try {
            const state = typeof firstPage.craftState === 'string'
              ? firstPage.craftState : JSON.stringify(firstPage.craftState);
            actions.deserialize(state);
          } catch (e) {
            console.warn('Failed to load page state:', e);
          }
        }
      }
    }
    return data;
  }, [isWHP, whpConfig, actions, setHeaderCraftState, setFooterCraftState, setPagesCraftState]);

  const uploadAsset = useCallback(
    async (file: File) => {
      if (!isWHP || !whpConfig) return null;

      const formData = new FormData();
      formData.append('file', file);

      const resp = await fetch(
        `${whpConfig.apiUrl}?action=upload_asset&site_id=${whpConfig.siteId}`,
        {
          method: 'POST',
          headers: { 'X-CSRF-Token': whpConfig.csrfToken },
          body: formData,
        },
      );
      return resp.json();
    },
    [isWHP, whpConfig],
  );

  return { save, publish, load, uploadAsset, isWHP };
}