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+# Product Search Module — README
+
+This module provides a lightweight **catalogue search and keyword intelligence** workflow on top of the DiscountMate master catalogue. It is intended for fast exploration of product text, category-level keyword discovery, and coverage reporting (how well a keyword captures products within one or more categories).
+
+It complements the **product matching** pipeline by helping the team:
+- decide which keywords are useful for category-aware search,
+- understand which terms are shared across categories (low specificity),
+- identify unique terms that best describe each category,
+- quantify how many products would be returned by a keyword-driven query.
+
+---
+
+## What problem this solves
+
+When the catalogue grows, teams typically need:
+- a quick way to search products without heavy infrastructure,
+- a method to extract category-defining keywords,
+- evidence-based keyword lists to guide scraping rules, filtering, or UI search,
+- “coverage” metrics that quantify how broad or narrow a keyword is.
+
+This script uses **TF-IDF** and simple reverse counting to provide these signals in a transparent way.
+
+---
+
+## Key scenarios where this code is useful
+
+### 1) Category-aware keyword selection
+Example: You want 1–3 keywords per `merchandise_category` to drive search or filtering.
+- Output: Top TF-IDF terms per category, plus their product coverage.
+
+### 2) Measure how “broad” a keyword is across categories
+Example: Terms like `pack`, `coles`, `fresh` appear everywhere and are not helpful for precise search.
+- Output: For each keyword, top categories where it appears and coverage % per category.
+
+### 3) Identify unique/category-defining terms
+Example: Find words that strongly identify a category and rarely appear elsewhere.
+- Output: Candidate “unique” keywords by category, ranked by TF-IDF and uniqueness.
+
+### 4) Build a quick “search impact” view
+Example: Before using a keyword list in production, estimate:
+- How many products will match each keyword?
+- Which categories will be impacted most?
+
+### 5) Support blocking / narrowing strategies for matching
+Example: Use category or keyword signals as an additional filter before doing expensive similarity matching.
+- Output: Keywords with high category coverage can be used as coarse filters; high specificity terms can help disambiguate.
+
+---
+
+## Requirements
+
+Python 3.9+ recommended.
+
+Install dependencies:
+
+```bash
+pip install pandas numpy scikit-learn
+
+python product_search.py \
+  --master_csv "Master_Coles_Scrape.csv" \
+  --category_col "merchandise_category"
+
+python product_search.py \
+  --master_csv "Master_Coles_Scrape.csv" \
+  --category_col "merchandise_category" \
+  --text_cols brand name description size \
+  --top_terms_global 20 \
+  --top_terms_per_category 3 \
+  --min_df 3 \
+  --max_df 0.7 \
+  --shared_min_categories 3 \
+  --top_categories_per_keyword 3
+```
+
+
+# Command Line Parameters
+
+| Parameter | Type | Required | Default | Description |
+|----------|------|----------|---------|-------------|
+| `--master_csv` | string | No | `Master_Coles_Scrape.csv` | Master catalogue CSV filename (loaded from `./data/<master_csv>` relative to the script location). |
+| `--query` | string | No | `None` | Search query string. If provided, the script runs **Search mode** and returns top matches from the master catalogue using TF-IDF cosine nearest neighbours. |
+| `--top_k` | int | No | `10` | Number of top results returned in **Search mode** (top-K nearest neighbours). |
+| `--do_keywords` | flag | No | `False` | If set, runs **Keyword analysis mode** (TF-IDF keyword exploration + coverage reporting). |
+| `--category_col` | string | No | `merchandise_category` | Category column used to group products for per-category TF-IDF keywords and coverage analysis. Must exist in the master CSV. |
+
+## Notes on Modes
+
+**Search mode** runs when `--query` is provided.  
+  Example:
+  ```bash
+  python product_search.py --master_csv "Master_Coles_Scrape.csv" --query "mccain pub style fries 750g" --top_k 10
diff --git a/ML/Product Search/product_search.py b/ML/Product Search/product_search.py
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+# product_search.py
+# -----------------
+# DiscountMate - Product Search + TF-IDF Keyword Exploration
+#
+# This script supports:
+# 1) Search: given a query, return top-K master products using TF-IDF cosine NN
+# 2) Keyword analysis:
+#       - top informative terms overall
+#       - top terms per category
+#       - keyword coverage per category
+#       - shared keywords across categories + coverage
+#       - top-N categories per keyword by coverage
+
+import re
+import argparse
+import pandas as pd
+import numpy as np
+
+from sklearn.feature_extraction.text import TfidfVectorizer
+from sklearn.neighbors import NearestNeighbors
+
+import os    
+
+
+# ----------------------------
+# Cleaning + canon
+# ----------------------------
+def clean(s):
+    if pd.isna(s):
+        return ""
+    s = str(s).lower()
+    s = re.sub(r"[^\w\s]", " ", s)
+    s = re.sub(r"\s+", " ", s).strip()
+    return s
+
+def build_master_canon(master_df: pd.DataFrame, features = ['brand','name','size']) -> pd.Series:
+    # Team recommendation: BRAND + NAME + SIZE (keep spaces)
+    combined = ""
+    for featuer in features:
+        combined = combined + master_df[featuer].fillna("") + " "
+
+    return combined.map(clean)
+
+    # return (
+    #     master_df["brand"].fillna("") + " " +
+    #     master_df["name"].fillna("") + " " +
+    #     master_df["size"].fillna("")
+    # ).map(clean)
+
+def build_search_index(master_df: pd.DataFrame, *, ngram=(1, 2), min_df=1, stop_words="english"):
+
+    master = master_df.copy().reset_index(drop=True)
+    master["canon"] = build_master_canon(master)
+
+    vec = TfidfVectorizer(ngram_range=ngram, min_df=min_df, stop_words=stop_words)
+    X = vec.fit_transform(master["canon"].tolist())
+
+    nn = NearestNeighbors(metric="cosine")
+    nn.fit(X)
+    return master, vec, nn, X
+
+def search_master(master, vec, nn, query: str, top_k: int = 10) -> pd.DataFrame:
+    q = clean(query)
+    q_vec = vec.transform([q])
+    distances, indices = nn.kneighbors(q_vec, n_neighbors=min(top_k, len(master)))
+    sims = 1 - distances[0]
+    idxs = indices[0]
+
+    out = master.iloc[idxs].copy()
+    out["cos_sim"] = sims
+    out["master_pos"] = idxs
+    keep = [c for c in ["master_pos", "product_id", "name", "brand", "size", "gtin", "cos_sim", "canon"] if c in out.columns]
+    return out[keep].sort_values("cos_sim", ascending=False).reset_index(drop=True)
+
+
+# ----------------------------
+# TF-IDF keyword exploration
+# ----------------------------
+def top_terms_overall(master_df: pd.DataFrame, text_col="canon", top_n=20):
+    texts = master_df[text_col].tolist()
+
+    vec = TfidfVectorizer(
+        ngram_range=(1, 1),
+        min_df=3,
+        max_df=0.7,
+        stop_words="english"
+    )
+    X = vec.fit_transform(texts)
+    terms = np.array(vec.get_feature_names_out())
+    mean_tfidf = X.mean(axis=0).A1
+
+    tfidf_df = pd.DataFrame({"term": terms, "mean_tfidf": mean_tfidf})
+    return tfidf_df.sort_values("mean_tfidf", ascending=False).head(top_n).reset_index(drop=True)
+
+def top_terms_per_category(df, category_col, text_col="canon", top_n=3, min_df=1):
+    results = []
+    for cat, g in df.groupby(category_col):
+        texts = g[text_col].tolist()
+        if len(texts) < 2:
+            continue
+
+        vec = TfidfVectorizer(
+            ngram_range=(1, 2),
+            stop_words="english",
+            min_df=min_df,
+            max_df=0.95,
+            token_pattern=r"(?u)\b[a-zA-Z][a-zA-Z]+\b"
+        )
+        X = vec.fit_transform(texts)
+        terms = np.array(vec.get_feature_names_out())
+        scores = X.mean(axis=0).A1
+
+        top_idx = scores.argsort()[::-1][:top_n]
+        for i in top_idx:
+            results.append({category_col: cat, "keyword": terms[i], "mean_tfidf": round(scores[i], 4)})
+
+    return pd.DataFrame(results)
+
+def reverse_keyword_count(df, category_col, text_col, keywords_df):
+    rows = []
+    for _, r in keywords_df.iterrows():
+        cat = r[category_col]
+        kw = r["keyword"]
+
+        subset = df[df[category_col] == cat]
+        total = len(subset)
+        if total == 0:
+            continue
+
+        count = subset[text_col].str.contains(rf"\b{re.escape(kw)}\b", regex=True).sum()
+        rows.append({
+            category_col: cat,
+            "keyword": kw,
+            "product_count": int(count),
+            "total_products": int(total),
+            "coverage_pct": round(100 * count / total, 1)
+        })
+    return pd.DataFrame(rows)
+
+def shared_keyword_coverage(df, category_col, text_col, keywords_df, min_categories=3, top_categories_per_keyword=3):
+    # 1) shared keywords (appearing in >= min_categories categories)
+    shared_keywords = (
+        keywords_df.groupby("keyword")[category_col]
+        .nunique()
+        .reset_index(name="num_categories")
+        .sort_values("num_categories", ascending=False)
+    )
+    shared_terms = shared_keywords.loc[shared_keywords["num_categories"] >= min_categories, "keyword"]
+
+    # 2) coverage across all categories for those shared terms
+    rows = []
+    for kw in shared_terms:
+        for cat, g in df.groupby(category_col):
+            total = len(g)
+            if total == 0:
+                continue
+
+            count = g[text_col].str.contains(rf"\b{re.escape(kw)}\b", regex=True).sum()
+            if count > 0:
+                rows.append({
+                    "keyword": kw,
+                    "category": cat,
+                    "product_count": int(count),
+                    "total_products": int(total),
+                    "coverage_pct": round(100 * count / total, 1)
+                })
+
+    coverage_df = pd.DataFrame(rows)
+    if coverage_df.empty:
+        return shared_keywords, coverage_df, coverage_df
+
+    # 3) top categories per keyword by coverage
+    coverage_df["rank_in_keyword"] = (
+        coverage_df.groupby("keyword")["coverage_pct"]
+        .rank(method="first", ascending=False)
+    )
+    topN = (
+        coverage_df[coverage_df["rank_in_keyword"] <= top_categories_per_keyword]
+        .sort_values(["keyword", "coverage_pct"], ascending=[True, False])
+        .reset_index(drop=True)
+    )
+
+    return shared_keywords, coverage_df, topN
+
+
+def main():
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--master_csv", default="Master_Coles_Scrape.csv")
+    ap.add_argument("--query", default=None)
+    ap.add_argument("--top_k", type=int, default=10)
+    ap.add_argument("--do_keywords", action="store_true" , default=True)
+    ap.add_argument("--category_col", default="merchandise_category")
+    args = ap.parse_args()
+
+    BASE_DIR = os.path.dirname(os.path.abspath(__file__))
+    master_file_path = os.path.join(BASE_DIR, 'data', args.master_csv)
+
+    master_df = pd.read_csv(master_file_path)
+
+    master_df = master_df.copy()
+    master_df["canon"] = build_master_canon(master_df)
+
+    # --- Search mode
+    if args.query:
+        master, vec, nn, _ = build_search_index(master_df, ngram=(1, 2), min_df=1)
+        res = search_master(master, vec, nn, args.query, top_k=args.top_k)
+        print("\nTop matches:")
+        print(res.to_string(index=False))
+
+    # --- Keyword analysis mode
+    if args.do_keywords:
+        if args.category_col not in master_df.columns:
+            raise ValueError(f"category_col='{args.category_col}' not found in master columns")
+
+        print("\nTop 20 most informative terms overall:")
+        print(top_terms_overall(master_df, text_col="canon", top_n=20).to_string(index=False))
+
+        cat_kw = top_terms_per_category(master_df, category_col=args.category_col, text_col="canon", top_n=3, min_df=1)
+        print("\nTop 3 keywords per category:")
+        print(cat_kw.head(30).to_string(index=False))
+
+        kw_cov = reverse_keyword_count(master_df, args.category_col, "canon", cat_kw)
+        print("\nKeyword coverage per category (sample):")
+        print(kw_cov.head(20).to_string(index=False))
+
+        shared_kw, coverage_df, topN = shared_keyword_coverage(
+            master_df, args.category_col, "canon", cat_kw,
+            min_categories=3, top_categories_per_keyword=5
+        )
+
+        print("\nShared keywords (top 20 by number of categories):")
+        print(shared_kw.head(20).to_string(index=False))
+
+        print("\nTop categories per shared keyword (by coverage):")
+        if len(topN):
+            print(topN.head(50).to_string(index=False))
+        else:
+            print("No shared keywords found with the current settings.")
+
+
+if __name__ == "__main__":
+    main()