diff --git a/components/utils/mermaid-diagram.utils.ts b/components/utils/mermaid-diagram.utils.ts
new file mode 100644
index 0000000..8288648
--- /dev/null
+++ b/components/utils/mermaid-diagram.utils.ts
@@ -0,0 +1,268 @@
+export type MermaidDirection = "TD" | "LR" | "TB" | "RL";
+export type MermaidNodeShape =
+  | "rectangle"
+  | "round"
+  | "stadium"
+  | "subroutine"
+  | "circle"
+  | "diamond";
+export type MermaidEdgeStyle = "solid" | "dashed" | "thick";
+
+export interface MermaidNode {
+  id: string;
+  label: string;
+  shape: MermaidNodeShape;
+}
+
+export interface MermaidEdge {
+  from: string;
+  to: string;
+  label?: string;
+  style: MermaidEdgeStyle;
+}
+
+export interface MermaidDiagram {
+  direction: MermaidDirection;
+  nodes: MermaidNode[];
+  edges: MermaidEdge[];
+}
+
+const shapeWrappers: Record<
+  MermaidNodeShape,
+  { open: string; close: string }
+> = {
+  rectangle: { open: "[", close: "]" },
+  round: { open: "(", close: ")" },
+  stadium: { open: "([", close: "])" },
+  subroutine: { open: "[[", close: "]]" },
+  circle: { open: "((", close: "))" },
+  diamond: { open: "{", close: "}" },
+};
+
+const edgeTokens: Record<MermaidEdgeStyle, string> = {
+  solid: "-->",
+  dashed: "-.->",
+  thick: "==>",
+};
+
+const edgeTokenToStyle: Record<string, MermaidEdgeStyle> = {
+  "-->": "solid",
+  "-.->": "dashed",
+  "==>": "thick",
+};
+
+const sanitizeId = (value: string) => {
+  const sanitized = value.trim().replace(/[^a-zA-Z0-9_]/g, "_");
+  return sanitized.length ? sanitized : "node";
+};
+
+const escapeLabel = (value: string) => value.replace(/\|/g, "\\|");
+
+export const buildMermaidText = ({
+  direction,
+  nodes,
+  edges,
+}: MermaidDiagram): string => {
+  const header = `flowchart ${direction}`;
+  const nodeLines = nodes.map((node) => {
+    const wrapper = shapeWrappers[node.shape];
+    const label = escapeLabel(node.label || node.id);
+    return `${node.id}${wrapper.open}${label}${wrapper.close}`;
+  });
+  const edgeLines = edges.map((edge) => {
+    const token = edgeTokens[edge.style];
+    const label = edge.label ? `|${escapeLabel(edge.label)}|` : "";
+    return `${edge.from} ${token}${label} ${edge.to}`;
+  });
+  return [header, ...nodeLines, ...edgeLines].join("\n");
+};
+
+const getDirection = (text: string): MermaidDirection => {
+  const match = text.match(/^(flowchart|graph)\s+([A-Za-z]{2})/m);
+  const direction = (match?.[2] || "TD").toUpperCase();
+  if (direction === "LR" || direction === "TB" || direction === "RL") {
+    return direction;
+  }
+  return "TD";
+};
+
+const parseNodeLine = (line: string): MermaidNode | null => {
+  const trimmed = line.trim();
+  if (!trimmed) {
+    return null;
+  }
+  const idMatch = trimmed.match(/^([A-Za-z0-9_]+)\s*(.*)$/);
+  if (!idMatch) {
+    return null;
+  }
+  const [, rawId, rest] = idMatch;
+  const id = sanitizeId(rawId);
+  if (!rest) {
+    return { id, label: id, shape: "rectangle" };
+  }
+
+  const shapePairs: Array<[MermaidNodeShape, string, string]> = [
+    ["circle", "((", "))"],
+    ["subroutine", "[[", "]]"],
+    ["stadium", "([", "])"],
+    ["diamond", "{", "}"],
+    ["round", "(", ")"],
+    ["rectangle", "[", "]"],
+  ];
+
+  for (const [shape, open, close] of shapePairs) {
+    if (rest.startsWith(open) && rest.endsWith(close)) {
+      const label = rest.slice(open.length, rest.length - close.length);
+      return { id, label: label || id, shape };
+    }
+  }
+
+  return { id, label: rest.trim() || id, shape: "rectangle" };
+};
+
+const parseEdgeLine = (line: string): MermaidEdge | null => {
+  const trimmed = line.trim();
+  if (!trimmed) {
+    return null;
+  }
+
+  const labeled = trimmed.match(
+    /^([A-Za-z0-9_]+)\s+([-.=]+>)\|(.+)\|\s+([A-Za-z0-9_]+)$/
+  );
+  if (labeled) {
+    const [, fromRaw, token, label, toRaw] = labeled;
+    const style = edgeTokenToStyle[token] || "solid";
+    return {
+      from: sanitizeId(fromRaw),
+      to: sanitizeId(toRaw),
+      label: label.trim(),
+      style,
+    };
+  }
+
+  const unlabeled = trimmed.match(
+    /^([A-Za-z0-9_]+)\s+([-.=]+>)\s+([A-Za-z0-9_]+)$/
+  );
+  if (unlabeled) {
+    const [, fromRaw, token, toRaw] = unlabeled;
+    const style = edgeTokenToStyle[token] || "solid";
+    return {
+      from: sanitizeId(fromRaw),
+      to: sanitizeId(toRaw),
+      style,
+    };
+  }
+
+  return null;
+};
+
+export const parseMermaidText = (text: string): MermaidDiagram => {
+  const direction = getDirection(text);
+  const lines = text
+    .split("\n")
+    .map((line) => line.trim())
+    .filter(Boolean);
+
+  const nodes: MermaidNode[] = [];
+  const edges: MermaidEdge[] = [];
+  const nodeIds = new Set<string>();
+
+  for (const line of lines) {
+    if (/^(flowchart|graph)\s+/i.test(line)) {
+      continue;
+    }
+    const edge = parseEdgeLine(line);
+    if (edge) {
+      edges.push(edge);
+      nodeIds.add(edge.from);
+      nodeIds.add(edge.to);
+      continue;
+    }
+    const node = parseNodeLine(line);
+    if (node && !nodeIds.has(node.id)) {
+      nodes.push(node);
+      nodeIds.add(node.id);
+    }
+  }
+
+  for (const id of nodeIds) {
+    if (!nodes.find((node) => node.id === id)) {
+      nodes.push({ id, label: id, shape: "rectangle" });
+    }
+  }
+
+  return { direction, nodes, edges };
+};
+
+let mermaidInitialized = false;
+
+const ensureMermaidInitialized = async () => {
+  const mermaid = (await import("mermaid")).default;
+  if (!mermaidInitialized) {
+    mermaid.initialize({
+      startOnLoad: false,
+      securityLevel: "strict",
+      theme: "default",
+      fontFamily: "inherit",
+    });
+    mermaidInitialized = true;
+  }
+  return mermaid;
+};
+
+export const renderMermaidToSvg = async (diagramText: string) => {
+  if (typeof window === "undefined") {
+    return "";
+  }
+  const mermaid = await ensureMermaidInitialized();
+  const id = `mermaid-${Math.random().toString(36).slice(2)}`;
+  const { svg } = await mermaid.render(id, diagramText);
+  return svg;
+};
+
+export const downloadTextAsFile = (
+  content: string,
+  fileName: string,
+  mimeType: string
+) => {
+  const blob = new Blob([content], { type: mimeType });
+  const url = URL.createObjectURL(blob);
+  const link = document.createElement("a");
+  link.href = url;
+  link.download = fileName;
+  link.click();
+  URL.revokeObjectURL(url);
+};
+
+export const svgToPngDataUrl = (svg: string): Promise<string> =>
+  new Promise((resolve, reject) => {
+    const svgBlob = new Blob([svg], { type: "image/svg+xml;charset=utf-8" });
+    const url = URL.createObjectURL(svgBlob);
+    const image = new Image();
+    image.onload = () => {
+      const canvas = document.createElement("canvas");
+      const ctx = canvas.getContext("2d");
+      if (!ctx) {
+        URL.revokeObjectURL(url);
+        reject(new Error("Canvas context is not available"));
+        return;
+      }
+      canvas.width = image.width || 800;
+      canvas.height = image.height || 600;
+      ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
+      URL.revokeObjectURL(url);
+      resolve(canvas.toDataURL("image/png"));
+    };
+    image.onerror = () => {
+      URL.revokeObjectURL(url);
+      reject(new Error("Failed to render SVG to PNG"));
+    };
+    image.src = url;
+  });
+
+export const downloadDataUrl = (dataUrl: string, fileName: string) => {
+  const link = document.createElement("a");
+  link.href = dataUrl;
+  link.download = fileName;
+  link.click();
+};
diff --git a/components/utils/tools-list.ts b/components/utils/tools-list.ts
index aa8ef64..f82c1f5 100644
--- a/components/utils/tools-list.ts
+++ b/components/utils/tools-list.ts
@@ -137,6 +137,12 @@ export const tools = [
       "Instantly preview and validate SVG code in your browser. Perfect for developers working with vector graphics and debugging SVG markup.",
     link: "/utilities/svg-viewer",
   },
+  {
+    title: "Mermaid Diagram Builder",
+    description:
+      "Build and preview Mermaid flowcharts with a live editor and builder, plus export options for SVG and PNG.",
+    link: "/utilities/mermaid-diagram-builder",
+  },
   {
     title: "Lorem Ipsum Generator",
     description:
diff --git a/package-lock.json b/package-lock.json
index 9879cb3..bdd78a0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,6 +26,7 @@
         "curlconverter": "^4.10.1",
         "js-yaml": "^4.1.0",
         "lucide-react": "^0.414.0",
+        "mermaid": "^11.12.2",
         "next": "14.2.35",
         "next-themes": "^0.3.0",
         "papaparse": "^5.4.1",
@@ -99,6 +100,19 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/@antfu/install-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@antfu/install-pkg/-/install-pkg-1.1.0.tgz",
+      "integrity": "sha512-MGQsmw10ZyI+EJo45CdSER4zEb+p31LpDAFp2Z3gkSd1yqVZGi0Ebx++YTEMonJy4oChEMLsxZ64j8FH6sSqtQ==",
+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.3.0",
+        "tinyexec": "^1.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
     "node_modules/@babel/code-frame": {
       "version": "7.24.7",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.24.7.tgz",
@@ -664,6 +678,63 @@
       "integrity": "sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw==",
       "dev": true
     },
+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-7.1.1.tgz",
+      "integrity": "sha512-i1L7noDNxtFyL5DmZafWy1wRVhGehQmzZaz1HiN5e7iylJMSZR7ekOV7NsIqa5qBldlLrsKv4HbgFUVlQrz8Mw==",
+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/cst-dts-gen": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/cst-dts-gen/-/cst-dts-gen-11.0.3.tgz",
+      "integrity": "sha512-BvIKpRLeS/8UbfxXxgC33xOumsacaeCKAjAeLyOn7Pcp95HiRbrpl14S+9vaZLolnbssPIUuiUd8IvgkRyt6NQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/gast": "11.0.3",
+        "@chevrotain/types": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
+    "node_modules/@chevrotain/cst-dts-gen/node_modules/lodash-es": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.17.21.tgz",
+      "integrity": "sha512-mKnC+QJ9pWVzv+C4/U3rRsHapFfHvQFoFB92e52xeyGMcX6/OlIl78je1u8vePzYZSkkogMPJ2yjxxsb89cxyw==",
+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/gast": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/gast/-/gast-11.0.3.tgz",
+      "integrity": "sha512-+qNfcoNk70PyS/uxmj3li5NiECO+2YKZZQMbmjTqRI3Qchu8Hig/Q9vgkHpI3alNjr7M+a2St5pw5w5F6NL5/Q==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/types": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
+    "node_modules/@chevrotain/gast/node_modules/lodash-es": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.17.21.tgz",
+      "integrity": "sha512-mKnC+QJ9pWVzv+C4/U3rRsHapFfHvQFoFB92e52xeyGMcX6/OlIl78je1u8vePzYZSkkogMPJ2yjxxsb89cxyw==",
+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/regexp-to-ast": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/regexp-to-ast/-/regexp-to-ast-11.0.3.tgz",
+      "integrity": "sha512-1fMHaBZxLFvWI067AVbGJav1eRY7N8DDvYCTwGBiE/ytKBgP8azTdgyrKyWZ9Mfh09eHWb5PgTSO8wi7U824RA==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/types": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/types/-/types-11.0.3.tgz",
+      "integrity": "sha512-gsiM3G8b58kZC2HaWR50gu6Y1440cHiJ+i3JUvcp/35JchYejb2+5MVeJK0iKThYpAa/P2PYFV4hoi44HD+aHQ==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/utils": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/utils/-/utils-11.0.3.tgz",
+      "integrity": "sha512-YslZMgtJUyuMbZ+aKvfF3x1f5liK4mWNxghFRv7jqRR9C3R3fAOGTTKvxXDa2Y1s9zSbcpuO0cAxDYsc9SrXoQ==",
+      "license": "Apache-2.0"
+    },
     "node_modules/@cloudflare/speedtest": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/@cloudflare/speedtest/-/speedtest-1.6.0.tgz",
@@ -826,6 +897,23 @@
       "deprecated": "Use @eslint/object-schema instead",
       "dev": true
     },
+    "node_modules/@iconify/types": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@iconify/types/-/types-2.0.0.tgz",
+      "integrity": "sha512-+wluvCrRhXrhyOmRDJ3q8mux9JkKy5SJ/v8ol2tu4FVjyYvtEzkc/3pK15ET6RKg4b4w4BmTk1+gsCUhf21Ykg==",
+      "license": "MIT"
+    },
+    "node_modules/@iconify/utils": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/@iconify/utils/-/utils-3.1.0.tgz",
+      "integrity": "sha512-Zlzem1ZXhI1iHeeERabLNzBHdOa4VhQbqAcOQaMKuTuyZCpwKbC2R4Dd0Zo3g9EAc+Y4fiarO8HIHRAth7+skw==",
+      "license": "MIT",
+      "dependencies": {
+        "@antfu/install-pkg": "^1.1.0",
+        "@iconify/types": "^2.0.0",
+        "mlly": "^1.8.0"
+      }
+    },
     "node_modules/@icons/material": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/@icons/material/-/material-0.2.4.tgz",
@@ -1413,6 +1501,15 @@
         "semver": "bin/semver.js"
       }
     },
+    "node_modules/@mermaid-js/parser": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/@mermaid-js/parser/-/parser-0.6.3.tgz",
+      "integrity": "sha512-lnjOhe7zyHjc+If7yT4zoedx2vo4sHaTmtkl1+or8BRTnCtDmcTpAjpzDSfCZrshM5bCoz0GyidzadJAH1xobA==",
+      "license": "MIT",
+      "dependencies": {
+        "langium": "3.3.1"
+      }
+    },
     "node_modules/@monaco-editor/loader": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/@monaco-editor/loader/-/loader-1.4.0.tgz",
@@ -4175,6 +4272,259 @@
         "@babel/types": "^7.20.7"
       }
     },
+    "node_modules/@types/d3": {
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/@types/d3/-/d3-7.4.3.tgz",
+      "integrity": "sha512-lZXZ9ckh5R8uiFVt8ogUNf+pIrK4EsWrx2Np75WvF/eTpJ0FMHNhjXk8CKEx/+gpHbNQyJWehbFaTvqmHWB3ww==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/d3-axis": "*",
+        "@types/d3-brush": "*",
+        "@types/d3-chord": "*",
+        "@types/d3-color": "*",
+        "@types/d3-contour": "*",
+        "@types/d3-delaunay": "*",
+        "@types/d3-dispatch": "*",
+        "@types/d3-drag": "*",
+        "@types/d3-dsv": "*",
+        "@types/d3-ease": "*",
+        "@types/d3-fetch": "*",
+        "@types/d3-force": "*",
+        "@types/d3-format": "*",
+        "@types/d3-geo": "*",
+        "@types/d3-hierarchy": "*",
+        "@types/d3-interpolate": "*",
+        "@types/d3-path": "*",
+        "@types/d3-polygon": "*",
+        "@types/d3-quadtree": "*",
+        "@types/d3-random": "*",
+        "@types/d3-scale": "*",
+        "@types/d3-scale-chromatic": "*",
+        "@types/d3-selection": "*",
+        "@types/d3-shape": "*",
+        "@types/d3-time": "*",
+        "@types/d3-time-format": "*",
+        "@types/d3-timer": "*",
+        "@types/d3-transition": "*",
+        "@types/d3-zoom": "*"
+      }
+    },
+    "node_modules/@types/d3-array": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/@types/d3-array/-/d3-array-3.2.2.tgz",
+      "integrity": "sha512-hOLWVbm7uRza0BYXpIIW5pxfrKe0W+D5lrFiAEYR+pb6w3N2SwSMaJbXdUfSEv+dT4MfHBLtn5js0LAWaO6otw==",
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-axis": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/@types/d3-axis/-/d3-axis-3.0.6.tgz",
+      "integrity": "sha512-pYeijfZuBd87T0hGn0FO1vQ/cgLk6E1ALJjfkC0oJ8cbwkZl3TpgS8bVBLZN+2jjGgg38epgxb2zmoGtSfvgMw==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-selection": "*"
+      }
+    },
+    "node_modules/@types/d3-brush": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/@types/d3-brush/-/d3-brush-3.0.6.tgz",
+      "integrity": "sha512-nH60IZNNxEcrh6L1ZSMNA28rj27ut/2ZmI3r96Zd+1jrZD++zD3LsMIjWlvg4AYrHn/Pqz4CF3veCxGjtbqt7A==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-selection": "*"
+      }
+    },
+    "node_modules/@types/d3-chord": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/@types/d3-chord/-/d3-chord-3.0.6.tgz",
+      "integrity": "sha512-LFYWWd8nwfwEmTZG9PfQxd17HbNPksHBiJHaKuY1XeqscXacsS2tyoo6OdRsjf+NQYeB6XrNL3a25E3gH69lcg==",
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-color": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/@types/d3-color/-/d3-color-3.1.3.tgz",
+      "integrity": "sha512-iO90scth9WAbmgv7ogoq57O9YpKmFBbmoEoCHDB2xMBY0+/KVrqAaCDyCE16dUspeOvIxFFRI+0sEtqDqy2b4A==",
+      "license": "MIT"
+    },
+    "node_modules/@types/d3-contour": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/@types/d3-contour/-/d3-contour-3.0.6.tgz",
+      "integrity": "sha512-BjzLgXGnCWjUSYGfH1cpdo41/hgdWETu4YxpezoztawmqsvCeep+8QGfiY6YbDvfgHz/DkjeIkkZVJavB4a3rg==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/geojson": "*"
+      }
+    },
+    "node_modules/@types/d3-delaunay": {
+      "version": "6.0.4",
+      "resolved": "https://registry.npmjs.org/@types/d3-delaunay/-/d3-delaunay-6.0.4.tgz",
+      "integrity": "sha512-ZMaSKu4THYCU6sV64Lhg6qjf1orxBthaC161plr5KuPHo3CNm8DTHiLw/5Eq2b6TsNP0W0iJrUOFscY6Q450Hw==",
+      "license": "MIT"
+    },
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@@ -11603,6 +12635,12 @@
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@@ -12241,6 +13278,12 @@
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@@ -12677,6 +13729,15 @@
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@@ -12929,6 +13990,12 @@
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+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
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+      "license": "MIT",
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@@ -13087,6 +14167,55 @@
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diff --git a/package.json b/package.json
index a6b44bd..4e25a9a 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
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     "next": "14.2.35",
     "next-themes": "^0.3.0",
     "papaparse": "^5.4.1",
diff --git a/pages/utilities/mermaid-diagram-builder.tsx b/pages/utilities/mermaid-diagram-builder.tsx
new file mode 100644
index 0000000..9239193
--- /dev/null
+++ b/pages/utilities/mermaid-diagram-builder.tsx
@@ -0,0 +1,457 @@
+import { useCallback, useMemo, useState, useEffect } from "react";
+import PageHeader from "@/components/PageHeader";
+import { Card } from "@/components/ds/CardComponent";
+import Header from "@/components/Header";
+import { CMDK } from "@/components/CMDK";
+import CallToActionGrid from "@/components/CallToActionGrid";
+import Meta from "@/components/Meta";
+import { Textarea } from "@/components/ds/TextareaComponent";
+import { Label } from "@/components/ds/LabelComponent";
+import { Input } from "@/components/ds/InputComponent";
+import { Button } from "@/components/ds/ButtonComponent";
+import {
+  Tabs,
+  TabsContent,
+  TabsList,
+  TabsTrigger,
+} from "@/components/ds/TabsComponent";
+import { useCopyToClipboard } from "@/components/hooks/useCopyToClipboard";
+import {
+  buildMermaidText,
+  downloadDataUrl,
+  downloadTextAsFile,
+  parseMermaidText,
+  renderMermaidToSvg,
+  svgToPngDataUrl,
+  MermaidDirection,
+  MermaidEdge,
+  MermaidEdgeStyle,
+  MermaidNode,
+  MermaidNodeShape,
+} from "@/components/utils/mermaid-diagram.utils";
+
+const initialNodes: MermaidNode[] = [
+  { id: "Start", label: "Start", shape: "stadium" },
+  { id: "Decide", label: "Decision", shape: "diamond" },
+  { id: "Ship", label: "Ship it", shape: "rectangle" },
+  { id: "Refine", label: "Refine", shape: "round" },
+];
+
+const initialEdges: MermaidEdge[] = [
+  { from: "Start", to: "Decide", label: "Review", style: "solid" },
+  { from: "Decide", to: "Ship", label: "Yes", style: "solid" },
+  { from: "Decide", to: "Refine", label: "No", style: "dashed" },
+];
+
+const directionOptions: MermaidDirection[] = ["TD", "LR", "TB", "RL"];
+const nodeShapeOptions: { value: MermaidNodeShape; label: string }[] = [
+  { value: "rectangle", label: "Rectangle" },
+  { value: "round", label: "Round" },
+  { value: "stadium", label: "Stadium" },
+  { value: "subroutine", label: "Subroutine" },
+  { value: "circle", label: "Circle" },
+  { value: "diamond", label: "Diamond" },
+];
+const edgeStyleOptions: { value: MermaidEdgeStyle; label: string }[] = [
+  { value: "solid", label: "Solid" },
+  { value: "dashed", label: "Dashed" },
+  { value: "thick", label: "Thick" },
+];
+
+const buildInitialText = () =>
+  buildMermaidText({
+    direction: "TD",
+    nodes: initialNodes,
+    edges: initialEdges,
+  });
+
+export default function MermaidDiagramBuilder() {
+  const [direction, setDirection] = useState<MermaidDirection>("TD");
+  const [nodes, setNodes] = useState<MermaidNode[]>(initialNodes);
+  const [edges, setEdges] = useState<MermaidEdge[]>(initialEdges);
+  const [diagramText, setDiagramText] = useState(buildInitialText);
+  const [importText, setImportText] = useState(buildInitialText);
+  const [previewSvg, setPreviewSvg] = useState<string | null>(null);
+  const [renderError, setRenderError] = useState<string | null>(null);
+
+  const { buttonText: copyButtonText, handleCopy } =
+    useCopyToClipboard("Copy Mermaid");
+
+  const [newNodeId, setNewNodeId] = useState("");
+  const [newNodeLabel, setNewNodeLabel] = useState("");
+  const [newNodeShape, setNewNodeShape] =
+    useState<MermaidNodeShape>("rectangle");
+
+  const [newEdgeFrom, setNewEdgeFrom] = useState("");
+  const [newEdgeTo, setNewEdgeTo] = useState("");
+  const [newEdgeLabel, setNewEdgeLabel] = useState("");
+  const [newEdgeStyle, setNewEdgeStyle] =
+    useState<MermaidEdgeStyle>("solid");
+
+  const nodeOptions = useMemo(
+    () => nodes.map((node) => ({ id: node.id, label: node.label })),
+    [nodes]
+  );
+
+  useEffect(() => {
+    let isActive = true;
+    if (!diagramText.trim()) {
+      setPreviewSvg(null);
+      setRenderError(null);
+      return;
+    }
+    renderMermaidToSvg(diagramText)
+      .then((svg) => {
+        if (!isActive) {
+          return;
+        }
+        setPreviewSvg(svg);
+        setRenderError(null);
+      })
+      .catch((error) => {
+        if (!isActive) {
+          return;
+        }
+        setPreviewSvg(null);
+        setRenderError(
+          error instanceof Error ? error.message : "Failed to render diagram."
+        );
+      });
+    return () => {
+      isActive = false;
+    };
+  }, [diagramText]);
+
+  const syncFromBuilder = useCallback(() => {
+    const text = buildMermaidText({ direction, nodes, edges });
+    setDiagramText(text);
+    setImportText(text);
+  }, [direction, nodes, edges]);
+
+  const handleImportToBuilder = useCallback(() => {
+    const parsed = parseMermaidText(importText);
+    setDirection(parsed.direction);
+    setNodes(parsed.nodes);
+    setEdges(parsed.edges);
+    setDiagramText(importText);
+  }, [importText]);
+
+  const addNode = useCallback(() => {
+    const id = newNodeId.trim();
+    if (!id) {
+      return;
+    }
+    if (nodes.some((node) => node.id === id)) {
+      return;
+    }
+    const label = newNodeLabel.trim() || id;
+    setNodes((prev) => [...prev, { id, label, shape: newNodeShape }]);
+    setNewNodeId("");
+    setNewNodeLabel("");
+  }, [newNodeId, newNodeLabel, newNodeShape, nodes]);
+
+  const removeNode = useCallback((id: string) => {
+    setNodes((prev) => prev.filter((node) => node.id !== id));
+    setEdges((prev) => prev.filter((edge) => edge.from !== id && edge.to !== id));
+  }, []);
+
+  const addEdge = useCallback(() => {
+    if (!newEdgeFrom || !newEdgeTo) {
+      return;
+    }
+    setEdges((prev) => [
+      ...prev,
+      {
+        from: newEdgeFrom,
+        to: newEdgeTo,
+        label: newEdgeLabel.trim() || undefined,
+        style: newEdgeStyle,
+      },
+    ]);
+    setNewEdgeLabel("");
+  }, [newEdgeFrom, newEdgeTo, newEdgeLabel, newEdgeStyle]);
+
+  const removeEdge = useCallback((index: number) => {
+    setEdges((prev) => prev.filter((_, idx) => idx !== index));
+  }, []);
+
+  const handleCopyMarkdown = useCallback(() => {
+    handleCopy(`\`\`\`mermaid\n${diagramText}\n\`\`\``);
+  }, [diagramText, handleCopy]);
+
+  const handleDownloadSvg = useCallback(() => {
+    if (!previewSvg) {
+      return;
+    }
+    downloadTextAsFile(previewSvg, "diagram.svg", "image/svg+xml");
+  }, [previewSvg]);
+
+  const handleDownloadPng = useCallback(async () => {
+    if (!previewSvg) {
+      return;
+    }
+    const pngDataUrl = await svgToPngDataUrl(previewSvg);
+    downloadDataUrl(pngDataUrl, "diagram.png");
+  }, [previewSvg]);
+
+  return (
+    <main>
+      <Meta
+        title="Mermaid Diagram Builder | Free, Open Source & Ad-free"
+        description="Build and preview Mermaid diagrams in your browser. Generate diagrams with a builder, import Mermaid text, and export SVG or PNG."
+      />
+      <Header />
+      <CMDK />
+
+      <section className="container max-w-3xl mb-12">
+        <PageHeader
+          title="Mermaid Diagram Builder"
+          description="Build Mermaid diagrams with a live preview and export options."
+        />
+      </section>
+
+      <section className="container max-w-3xl mb-6">
+        <Card className="flex flex-col p-6 hover:shadow-none shadow-none rounded-xl">
+          <Tabs defaultValue="editor" className="w-full">
+            <TabsList className="grid w-full grid-cols-3 mb-4">
+              <TabsTrigger value="editor">Editor</TabsTrigger>
+              <TabsTrigger value="builder">Builder</TabsTrigger>
+              <TabsTrigger value="import">Import</TabsTrigger>
+            </TabsList>
+
+            <TabsContent value="editor" className="space-y-4">
+              <div>
+                <Label>Mermaid Text</Label>
+                <Textarea
+                  rows={10}
+                  value={diagramText}
+                  onChange={(event) => setDiagramText(event.target.value)}
+                  placeholder="flowchart TD\n  A[Start] --> B[End]"
+                  aria-label="Mermaid text input"
+                />
+              </div>
+            </TabsContent>
+
+            <TabsContent value="builder" className="space-y-6">
+              <div className="grid gap-6 md:grid-cols-2">
+                <div className="space-y-3">
+                  <Label>Direction</Label>
+                  <select
+                    className="flex h-10 w-full rounded-lg border border-input bg-muted px-3 py-2 text-sm"
+                    value={direction}
+                    onChange={(event) =>
+                      setDirection(event.target.value as MermaidDirection)
+                    }
+                  >
+                    {directionOptions.map((option) => (
+                      <option key={option} value={option}>
+                        {option}
+                      </option>
+                    ))}
+                  </select>
+                </div>
+                <div className="flex items-end">
+                  <Button variant="secondary" onClick={syncFromBuilder}>
+                    Generate Mermaid Text
+                  </Button>
+                </div>
+              </div>
+
+              <div className="grid gap-6 md:grid-cols-2">
+                <div className="space-y-4">
+                  <Label>Add Node</Label>
+                  <Input
+                    placeholder="Node ID (unique)"
+                    value={newNodeId}
+                    onChange={(event) => setNewNodeId(event.target.value)}
+                  />
+                  <Input
+                    placeholder="Label (optional)"
+                    value={newNodeLabel}
+                    onChange={(event) => setNewNodeLabel(event.target.value)}
+                  />
+                  <select
+                    className="flex h-10 w-full rounded-lg border border-input bg-muted px-3 py-2 text-sm"
+                    value={newNodeShape}
+                    onChange={(event) =>
+                      setNewNodeShape(event.target.value as MermaidNodeShape)
+                    }
+                  >
+                    {nodeShapeOptions.map((option) => (
+                      <option key={option.value} value={option.value}>
+                        {option.label}
+                      </option>
+                    ))}
+                  </select>
+                  <Button onClick={addNode} variant="secondary">
+                    Add Node
+                  </Button>
+                </div>
+
+                <div className="space-y-4">
+                  <Label>Add Edge</Label>
+                  <select
+                    className="flex h-10 w-full rounded-lg border border-input bg-muted px-3 py-2 text-sm"
+                    value={newEdgeFrom}
+                    onChange={(event) => setNewEdgeFrom(event.target.value)}
+                  >
+                    <option value="">From</option>
+                    {nodeOptions.map((option) => (
+                      <option key={option.id} value={option.id}>
+                        {option.label}
+                      </option>
+                    ))}
+                  </select>
+                  <select
+                    className="flex h-10 w-full rounded-lg border border-input bg-muted px-3 py-2 text-sm"
+                    value={newEdgeTo}
+                    onChange={(event) => setNewEdgeTo(event.target.value)}
+                  >
+                    <option value="">To</option>
+                    {nodeOptions.map((option) => (
+                      <option key={option.id} value={option.id}>
+                        {option.label}
+                      </option>
+                    ))}
+                  </select>
+                  <Input
+                    placeholder="Label (optional)"
+                    value={newEdgeLabel}
+                    onChange={(event) => setNewEdgeLabel(event.target.value)}
+                  />
+                  <select
+                    className="flex h-10 w-full rounded-lg border border-input bg-muted px-3 py-2 text-sm"
+                    value={newEdgeStyle}
+                    onChange={(event) =>
+                      setNewEdgeStyle(event.target.value as MermaidEdgeStyle)
+                    }
+                  >
+                    {edgeStyleOptions.map((option) => (
+                      <option key={option.value} value={option.value}>
+                        {option.label}
+                      </option>
+                    ))}
+                  </select>
+                  <Button onClick={addEdge} variant="secondary">
+                    Add Edge
+                  </Button>
+                </div>
+              </div>
+
+              <div className="grid gap-6 md:grid-cols-2">
+                <div className="space-y-2">
+                  <Label>Nodes</Label>
+                  <div className="space-y-2">
+                    {nodes.map((node) => (
+                      <div
+                        key={node.id}
+                        className="flex items-center justify-between rounded-lg border border-input bg-muted px-3 py-2 text-sm"
+                      >
+                        <span>
+                          {node.id} · {node.label} · {node.shape}
+                        </span>
+                        <Button
+                          size="sm"
+                          variant="outline"
+                          onClick={() => removeNode(node.id)}
+                        >
+                          Remove
+                        </Button>
+                      </div>
+                    ))}
+                  </div>
+                </div>
+                <div className="space-y-2">
+                  <Label>Edges</Label>
+                  <div className="space-y-2">
+                    {edges.map((edge, index) => (
+                      <div
+                        key={`${edge.from}-${edge.to}-${index}`}
+                        className="flex items-center justify-between rounded-lg border border-input bg-muted px-3 py-2 text-sm"
+                      >
+                        <span>
+                          {edge.from} → {edge.to}
+                          {edge.label ? ` · ${edge.label}` : ""}
+                          {` · ${edge.style}`}
+                        </span>
+                        <Button
+                          size="sm"
+                          variant="outline"
+                          onClick={() => removeEdge(index)}
+                        >
+                          Remove
+                        </Button>
+                      </div>
+                    ))}
+                  </div>
+                </div>
+              </div>
+            </TabsContent>
+
+            <TabsContent value="import" className="space-y-4">
+              <div>
+                <Label>Paste Mermaid Text</Label>
+                <Textarea
+                  rows={10}
+                  value={importText}
+                  onChange={(event) => setImportText(event.target.value)}
+                  placeholder="flowchart TD\n  A[Start] --> B[End]"
+                  aria-label="Mermaid import text input"
+                />
+              </div>
+              <div className="flex gap-3">
+                <Button variant="secondary" onClick={handleImportToBuilder}>
+                  Load into Builder
+                </Button>
+                <Button
+                  variant="outline"
+                  onClick={() => setDiagramText(importText)}
+                >
+                  Preview Only
+                </Button>
+              </div>
+              <p className="text-sm text-muted-foreground">
+                Import supports flowchart diagrams (TD/LR/TB/RL) generated by
+                this tool.
+              </p>
+            </TabsContent>
+          </Tabs>
+
+          <div className="mt-6 space-y-3">
+            <div className="flex flex-wrap gap-2">
+              <Button variant="secondary" onClick={handleCopyMarkdown}>
+                {copyButtonText}
+              </Button>
+              <Button variant="outline" onClick={handleDownloadSvg}>
+                Download SVG
+              </Button>
+              <Button variant="outline" onClick={handleDownloadPng}>
+                Download PNG
+              </Button>
+            </div>
+            <div className="rounded-lg border border-input bg-muted p-4">
+              {renderError && (
+                <p className="text-sm text-red-600" role="alert">
+                  {renderError}
+                </p>
+              )}
+              {!renderError && previewSvg && (
+                <div
+                  className="w-full overflow-auto"
+                  dangerouslySetInnerHTML={{ __html: previewSvg }}
+                />
+              )}
+              {!renderError && !previewSvg && (
+                <p className="text-sm text-muted-foreground">
+                  Enter Mermaid text to see a preview.
+                </p>
+              )}
+            </div>
+          </div>
+        </Card>
+      </section>
+
+      <CallToActionGrid />
+    </main>
+  );
+}