import { existsSync, unlinkSync, mkdirSync, readFileSync, readdirSync, writeFileSync } from "node:fs";
import { join } from "node:path";

export async function generateCatalogPages({ exampleRoot, pagesDir, blockComponents, componentMount, sourceSnippet, demoConfiguration, slugOf, displayName, escapeCode, escapeText, resetHoistedObjects, hoistedObjectStates }) {
  const write = (path, text) => { mkdirSync(join(pagesDir, path.substring(0,path.lastIndexOf('/')) || '.'), {recursive:true}); writeFileSync(join(pagesDir,path), text); };
  const codePanel = (source, id="example-source") => `<section class="example-code-panel"><header><h2>Copy this example</h2><button type="button" data-copy-target="#${id}">Copy code</button></header><pre><code id="${id}">${escapeCode(source)}</code></pre></section>`;
  const page = (name,title,body) => `page ${name} {\n layout = "gallery"\n seo { title = "${title}" }\n view { ${body} }\n}\n`;
  const cards = entries => `<div class="example-catalog">${entries.map(e=>`<a class="example-card" href="${e.href}"><div class="example-card__art"><span class="icon-[lucide--${e.icon}]" aria-hidden="true"></span></div><div><h2>${e.title}</h2><p>${e.description}</p><strong>Open example →</strong></div></a>`).join('')}</div>`;
  const examples = [
    {slug:'workspace',title:'Workspace overview',icon:'layout-dashboard',description:'A complete dashboard with navigation, metrics, and service cards.'},
    {slug:'profile',title:'Profile & preferences',icon:'user-round',description:'A responsive settings form with grouped fields and save feedback.'},
    {slug:'sign-in',title:'Sign in',icon:'log-in',description:'A focused authentication page with a compact form.'},
    {slug:'scheduling',title:'Scheduling',icon:'calendar-days',description:'Date, date-and-time, and time controls in a practical form.'},
    {slug:'custom-modal',title:'Custom modal',icon:'panels-top-left',description:'Open and close a fully controlled dialog from your own buttons.'},
    {slug:'project-board',title:'Project workspace',icon:'list-checks',description:'Reorder priorities and write rich-text project updates.'},
  ];
  const extra = {
    scheduling:`page SchedulingExample {\n view { <main class="example-form-page" style="max-width:42rem;margin:3rem auto;padding:1.5rem;display:grid;gap:1.5rem"><h1>Schedule a meeting</h1><p>Choose the date and time that work for your team.</p><DatePicker label="Meeting date" name="date" /><DatePicker type="datetime-local" label="Send reminder" name="reminder" value="2026-09-20T09:30" /><TimePicker label="Start time" name="time" value="09:30" /></main> }\n}`,
    'custom-modal':`page CustomModalExample {\n state dialogOpen: boolean = false\n view { <main class="example-form-page" style="max-width:42rem;margin:3rem auto;padding:1.5rem;display:grid;gap:1.5rem"><h1>Your own modal controls</h1><Button label="Invite a teammate" @click="dialogOpen = true" /><Modal open="{dialogOpen}" @close="dialogOpen = false" title="" description="" showFooter="true" cancelLabel="" confirmLabel=""><div data-slot="header"><h2>Invite a teammate</h2></div><Input label="Email address" type="email" name="invite-email" placeholder="name@company.com" /><div data-slot="footer"><Button label="Cancel" variant="secondary" @click="dialogOpen = false" /><Button label="Done" @click="dialogOpen = false" /></div></Modal></main> }\n}`,
    'project-board':`page ProjectBoardExample {\n state tasks = [{label:"Review designs"},{label:"Build the dashboard"},{label:"Test accessibility"}]\n view { <main class="example-form-page" style="max-width:42rem;margin:3rem auto;padding:1.5rem;display:grid;gap:1.5rem"><h1>Project workspace</h1><DragAndDrop title="Priorities" description="Drag a row or use its arrow buttons." items="{tasks}" /><WysiwygEditor title="Team update" value="Share what you are working on this week." /></main> }\n}`,
  };
  for (const e of examples) { const old = join(pagesDir,'templates',e.slug+'.wrn'); if(existsSync(old)) unlinkSync(old); }
  const css = readFileSync(join(exampleRoot,'app/styles/workspace-preview.css'),'utf8');
  for(const e of examples) {
    const source = extra[e.slug] || readFileSync(join(exampleRoot,'examples',e.slug+'.wrn'),'utf8');
    const at = source.lastIndexOf('\n  }');
    let rendered;
    if(at>=0) rendered = source.slice(0,at)+codePanel(source)+`<details class="example-code-panel"><summary>Page styles · copy with the example</summary><button type="button" data-copy-target="#example-styles">Copy CSS</button><pre><code id="example-styles">${escapeCode(css)}</code></pre></details>`+source.slice(at);
    else rendered = source.replace(/}\s*}\s*$/,codePanel(source)+' } }');
    rendered = rendered.replace(/\bview\s*\{/, 'view {\n<nav class="example-toolbar"><a href="/preview">← All examples</a><a href="#example-source">View code</a></nav>');
    write(`preview/${e.slug}.wrn`, rendered);

  }
  write('preview/index.wrn',page('PreviewIndex','Examples',`<header class="docs-intro"><span class="showcase-eyebrow">Ready to use</span><h1>Page examples</h1><p>Explore complete layouts, interact with the controls, and copy the source.</p></header>${cards(examples.map(e=>({...e,href:'/preview/'+e.slug})))}`));
  const templateGroups = [
    {slug:'dashboards',title:'Dashboards & admin',icon:'layout-dashboard',description:'Analytics and account operations with meaningful metrics.',heading:'Workspace performance',body:`<MetricCard title="Active accounts" value="1,284" /><Chart title="Weekly activity" type="bar" data='[{"label":"Mon","value":24},{"label":"Tue","value":38},{"label":"Wed","value":52}]' showLegend="false" /><Card title="Team access" description="Manage roles and permissions for your workspace." actionLabel="Manage team" actionHref="/preview/profile" />`},
    {slug:'commerce',title:'Commerce',icon:'shopping-bag',description:'A product collection with a working shopping bag.',heading:'Everyday essentials',body:`<p>Thoughtfully made tools for your desk.</p><div style="display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:1.25rem"><Card title="Studio notebook" description="Dot grid · recycled paper" footer="$18"><Button label="Add notebook" @click="bag = bag + 1" /></Card><Card title="Desk organizer" description="Solid oak · natural finish" footer="$42"><Button label="Add organizer" @click="bag = bag + 1" /></Card><Card title="Travel tumbler" description="Insulated · 350 ml" footer="$24"><Button label="Add tumbler" @click="bag = bag + 1" /></Card></div><p role="status">Shopping bag: {bag} items</p><Button label="Clear bag" variant="secondary" @click="bag = 0" />`},
    {slug:'marketing',title:'Marketing websites',icon:'sparkles',description:'A SaaS landing page with benefits, pricing, and a clear next step.',heading:'Make room for your best work.',body:`<p>One calm workspace for projects, notes, and the people behind them.</p><Button label="Explore the workspace" href="/preview/workspace" /><div style="display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:1.25rem"><Card title="Plan together" description="Turn your next idea into clear, shared priorities." /><Card title="Stay focused" description="Keep tasks, notes, and decisions in one place." /><Card title="Grow naturally" description="Start with your team. Add more space when you need it." /></div><Card title="Team plan" description="Everything your team needs to get started." footer="$19 / member / month" actionLabel="Get started" actionHref="/preview/sign-in" />`},
    {slug:'productivity',title:'Productivity',icon:'list-checks',description:'A planning workspace for priorities, deadlines, and notes.',heading:'Your week, in focus',body:`<DragAndDrop title="Priorities" items='[{"label":"Review the launch plan"},{"label":"Prepare customer interviews"},{"label":"Share the weekly update"}]' /><DatePicker label="Next milestone" name="milestone" /><WysiwygEditor title="Meeting notes" value="Capture decisions and next steps here." />`},
  ];
  write('templates.wrn',page('Templates','Templates',`<header class="docs-intro"><span class="showcase-eyebrow">Start a product</span><h1>Templates for your next idea</h1><p>Four starting points with complete layouts and copyable source. Examples demonstrate controls; templates combine them into a product page.</p></header>${cards(templateGroups.map(e=>({...e,href:'/templates/'+e.slug})))}`));
  for (const t of templateGroups) {
    const source = `page ${t.slug.replace(/-/g,'')}Template {
 state bag: number = 0
 view { <main style="max-width:72rem;margin:3rem auto;padding:2rem;display:grid;gap:1.5rem"><h1>${t.heading}</h1>${t.body}</main> }
}`;
    write(`templates/${t.slug}.wrn`, source.replace('view {', 'view {<nav class="example-toolbar"><a href="/templates">← All templates</a><a href="#example-source">View code</a></nav>').replace(/}\s*}\s*$/,codePanel(source)+' } }'));
  }
  const blockCards=[];
  for(const c of blockComponents) {
    const slug=slugOf(c.name); resetHoistedObjects();
    const config=demoConfiguration(c,0);
    const mount=componentMount(c,0,config);
    const states=hoistedObjectStates();
    const source=`page ${c.name}Example {${states}\n  view {\n    ${mount}\n  }\n}`;
    write(`blocks/${slug}.wrn`, `page ${c.name}Block {\n layout = "gallery"\n ${states}\n seo { title = "${displayName(c.name)} block" }\n view { <header class="docs-intro"><a href="/block-library">← All blocks</a><h1>${displayName(c.name)}</h1><p>A ready-to-use section. Copy the complete example below.</p></header><section class="block-live-preview">${mount}</section>${codePanel(source)} }\n}`);
    blockCards.push({title:displayName(c.name),description:c.purpose || 'A complete reusable page section.',icon:'layout-template',href:'/blocks/'+slug});
  }
  write('block-library.wrn',page('BlockLibrary','UI blocks',`<header class="docs-intro"><span class="showcase-eyebrow">Composed sections</span><h1>Ready-to-use blocks</h1><p>Real sections with live previews and complete source code.</p></header>${cards(blockCards)}`));
  write('blocks/index.wrn',page('BlocksIndex','UI blocks',cards(blockCards)));
  // Update internal guides to point to the moved block documentation.
  for(const directory of [pagesDir,join(pagesDir,'components')]) for(const file of readdirSync(directory).filter(f=>f.endsWith('.wrn'))) {
    const path=join(directory,file);let text=readFileSync(path,'utf8');
    for(const c of blockComponents) text=text.replaceAll('/components/'+slugOf(c.name),'/blocks/'+slugOf(c.name));
    if (text !== readFileSync(path,"utf8")) writeFileSync(path,text);
  }
}