//
//  Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

package chunker

import (
	"strings"
	"testing"

	"ragflow/internal/agent/runtime"
	"ragflow/internal/ingestion/component/schema"
)

func TestGroupTitleChunker_Registered(t *testing.T) {
	factory, cat, meta, ok := runtime.DefaultRegistry.Lookup("GroupTitleChunker")
	if !ok {
		t.Fatal("GroupTitleChunker: registry miss")
	}
	if cat != runtime.CategoryIngestion {
		t.Errorf("category = %q, want %q", cat, runtime.CategoryIngestion)
	}
	if factory == nil {
		t.Error("factory is nil")
	}
	if len(meta.Inputs) == 0 {
		t.Errorf("inputs metadata is empty")
	}
	if len(meta.Outputs) == 0 {
		t.Errorf("outputs metadata is empty")
	}
}

func TestGroupTitleChunker_InputsOutputs_NonEmpty(t *testing.T) {
	_, _, meta, ok := runtime.DefaultRegistry.Lookup("GroupTitleChunker")
	if !ok {
		t.Fatal("registry miss")
	}
	if len(meta.Inputs) == 0 {
		t.Error("inputs metadata is empty")
	}
	if len(meta.Outputs) == 0 {
		t.Error("outputs metadata is empty")
	}
}

func TestGroupTitleChunker_NewRejectsHierarchyWithoutHierarchyParam(t *testing.T) {
	// Although method defaults to "group", the levels branch still
	// fires and rejects an empty levels config.
	if _, err := NewGroupTitleChunker(map[string]any{}); err == nil {
		t.Fatal("expected error for empty levels, got nil")
	}
}

// TestExtractLineRecords_MarkdownKey verifies extractLineRecords reads
// the "markdown" payload key. Before this fix extractLineRecords only
// looked at "text"/"content" and silently returned nil for parser
// output that carried output_format="markdown".
func TestExtractLineRecords_MarkdownKey(t *testing.T) {
	records := extractLineRecords(map[string]any{
		"output_format": "markdown",
		"markdown":      "line1\nline2\nline3",
	})
	if len(records) != 3 {
		t.Fatalf("got %d records, want 3", len(records))
	}
	for i, r := range records {
		if r.textOrEmpty() == "" {
			t.Errorf("record[%d]: empty text", i)
		}
	}
}

// TestExtractLineRecords_HTMLKey verifies extractLineRecords reads the
// "html" payload key, same safety-net rationale as TestMarkdownKey.
func TestExtractLineRecords_HTMLKey(t *testing.T) {
	records := extractLineRecords(map[string]any{
		"output_format": "html",
		"html":          "<p>first</p>\n<p>second</p>",
	})
	if len(records) != 2 {
		t.Fatalf("got %d records, want 2", len(records))
	}
}

// TestExtractLineRecords_TextKeyStillWorks ensures the existing "text"
// key path is not broken by the addition of "markdown"/"html".
func TestExtractLineRecords_TextKeyStillWorks(t *testing.T) {
	records := extractLineRecords(map[string]any{
		"text": "hello\nworld",
	})
	if len(records) != 2 {
		t.Fatalf("got %d records, want 2", len(records))
	}
}

func TestGroupTitleChunker_InvokeEmptyInput(t *testing.T) {
	c, err := NewGroupTitleChunker(map[string]any{
		"levels": [][]string{{`^# `}},
	})
	if err != nil {
		t.Fatalf("NewGroupTitleChunker: %v", err)
	}
	out, err := c.Invoke(t.Context(), nil, map[string]any{})
	if err != nil {
		t.Fatalf("Invoke: %v", err)
	}
	if got, want := out["output_format"], "chunks"; got != want {
		t.Errorf("output_format = %v, want %v", got, want)
	}
	chunks, _ := out["chunks"].([]map[string]any)
	if len(chunks) != 0 {
		t.Errorf("chunks = %d, want 0", len(chunks))
	}
}

func TestGroupTitleChunker_Headings_ASCII(t *testing.T) {
	c, err := NewGroupTitleChunker(map[string]any{
		"levels": [][]string{
			{`^# `},
			{`^## `},
		},
	})
	if err != nil {
		t.Fatalf("NewGroupTitleChunker: %v", err)
	}
	input := "# Heading One\nBody line under H1.\nAnother body line.\n# Heading Two\nBody under second H1."
	out, err := c.Invoke(t.Context(), nil, map[string]any{
		"name": "doc.md",
		"text": input,
	})
	if err != nil {
		t.Fatalf("Invoke: %v", err)
	}
	chunks, _ := out["chunks"].([]map[string]any)
	if len(chunks) == 0 {
		t.Fatal("chunks: want >=1, got 0")
	}
}

func TestGroupTitleChunker_RootChunkAsHeading_StillSingleGroup(t *testing.T) {
	// When the input is single-group, the root-as-heading branch
	// doesn't reduce the count below 1.
	c, err := NewGroupTitleChunker(map[string]any{
		"levels":                [][]string{{`^# `}},
		"root_chunk_as_heading": true,
	})
	if err != nil {
		t.Fatalf("NewGroupTitleChunker: %v", err)
	}
	out, err := c.Invoke(t.Context(), nil, map[string]any{
		"name": "doc.md",
		"text": "Body without any heading here.\nMore body.",
	})
	if err != nil {
		t.Fatalf("Invoke: %v", err)
	}
	chunks, _ := out["chunks"].([]map[string]any)
	if len(chunks) == 0 {
		t.Fatal("chunks: want >=1, got 0")
	}
}

// TestResolveGroupTargetLevel_UsesMostLevelDirectly pins Gap F: when
// `hierarchy` is unset the group target level is `most_level` DIRECTLY,
// not resolve_target_level (which would re-rank the distinct heading
// levels and pick the wrong depth when levels are not contiguous from
// 1). With levels {2,2,3} most_level is 2, but resolve_target_level
// would return 3.
func TestResolveGroupTargetLevel_UsesMostLevelDirectly(t *testing.T) {
	levels := []int{2, 2, 3, bodyLevel, bodyLevel}
	pUnset := &titleChunkerParam{TitleChunkerParam: schema.TitleChunkerParam{Method: "group"}}
	if got := resolveGroupTargetLevel(levels, pUnset, 2); got != 2 {
		t.Errorf("unset hierarchy: got %d, want 2 (most_level directly)", got)
	}
	h := 2
	pSet := &titleChunkerParam{TitleChunkerParam: schema.TitleChunkerParam{Method: "group", Hierarchy: &h}}
	if got := resolveGroupTargetLevel(levels, pSet, 2); got != 3 {
		t.Errorf("hierarchy=2: got %d, want 3 (resolve_target_level)", got)
	}
}

// TestGroupChunker_StructuredMetadata pins Gap E: for a structured
// (output_format=chunks) payload, non-text records keep their
// doc_type_kwd and img_id on the emitted chunk.
func TestGroupChunker_StructuredMetadata(t *testing.T) {
	c, err := NewGroupTitleChunker(map[string]any{
		"levels": [][]string{{`^# `}},
	})
	if err != nil {
		t.Fatalf("NewGroupTitleChunker: %v", err)
	}
	items := []map[string]any{
		{"text": "# Heading", "doc_type_kwd": "text"},
		{"text": "body line", "doc_type_kwd": "text"},
		{"text": "an image caption", "doc_type_kwd": "image", "img_id": "img-9"},
	}
	out, err := c.Invoke(t.Context(), nil, map[string]any{
		"name":          "doc",
		"output_format": "chunks",
		"chunks":        items,
	})
	if err != nil {
		t.Fatalf("Invoke: %v", err)
	}
	chunks, _ := out["chunks"].([]map[string]any)
	found := false
	for _, ck := range chunks {
		if dt, _ := ck["doc_type_kwd"].(string); dt == "image" {
			found = true
			if ck["img_id"] != "img-9" {
				t.Errorf("image chunk img_id = %v, want img-9", ck["img_id"])
			}
		}
	}
	if !found {
		t.Fatal("no image chunk emitted")
	}
}

// TestGroupChunker_MergesPDFPositionsAndRemovesTags is the TDD test for
// migration diffs Chunker-1.6 / 2.8: when the group chunker merges
// multiple adjacent text records into one chunk it must (a) strip the
// parser-emitted `@@...##` position tags from the joined text, and
// (b) MERGE (not drop) the `positions` coordinate matrices across the
// merged records — mirroring common.py:255 remove_tag + merge.
func TestGroupChunker_MergesPDFPositionsAndRemovesTags(t *testing.T) {
	c, err := NewGroupTitleChunker(map[string]any{
		"levels": [][]string{{`^# `}},
	})
	if err != nil {
		t.Fatalf("NewGroupTitleChunker: %v", err)
	}
	items := []map[string]any{
		{"text": "# Heading", "doc_type_kwd": "text"},
		{"text": "body one @@1\t10.0\t20.0\t30.0\t40.0## tail", "doc_type_kwd": "text", "positions": [][]float64{{1, 10, 20, 30, 40}}},
		{"text": "body two @@2\t15.0\t25.0\t35.0\t45.0## tail", "doc_type_kwd": "text", "positions": [][]float64{{2, 15, 25, 35, 45}}},
	}
	out, err := c.Invoke(t.Context(), nil, map[string]any{
		"name":          "doc",
		"output_format": "chunks",
		"chunks":        items,
	})
	if err != nil {
		t.Fatalf("Invoke: %v", err)
	}
	chunks, _ := out["chunks"].([]map[string]any)
	if len(chunks) == 0 {
		t.Fatal("no chunks emitted")
	}
	for _, ck := range chunks {
		text, _ := ck["text"].(string)
		// Only the merged body group carries both bodies.
		if !strings.Contains(text, "body one") || !strings.Contains(text, "body two") {
			continue
		}
		// (a) parser tags must be stripped from the text.
		if strings.Contains(text, "@@") {
			t.Errorf("parser position tags leaked into chunk text: %q", text)
		}
		// (b) positions must be merged across both records.
		pos, ok := ck["positions"].([][]float64)
		if !ok {
			t.Fatalf("positions missing or wrong type %T on merged group chunk", ck["positions"])
		}
		if len(pos) != 2 {
			t.Errorf("merged positions = %d groups, want 2 (both records)", len(pos))
		}
		return
	}
	t.Fatal("merged body group chunk not found in output")
}

func TestGroupTitleChunker_InvokeDeterministic(t *testing.T) {
	c, err := NewGroupTitleChunker(map[string]any{
		"levels": [][]string{
			{`^# `},
			{`^## `},
		},
	})
	if err != nil {
		t.Fatalf("NewGroupTitleChunker: %v", err)
	}
	inputs := map[string]any{
		"name": "doc.md",
		"text": "# A\nbody a1\nbody a2\n# B\nbody b1\nbody b2",
	}
	var firstLen int
	var firstTexts []string
	for run := 0; run < 10; run++ {
		out, err := c.Invoke(t.Context(), nil, inputs)
		if err != nil {
			t.Fatalf("Invoke run %d: %v", run, err)
		}
		chunks, _ := out["chunks"].([]map[string]any)
		texts := make([]string, len(chunks))
		for i, ck := range chunks {
			texts[i], _ = ck["text"].(string)
		}
		if run == 0 {
			firstLen = len(chunks)
			firstTexts = texts
			continue
		}
		if firstLen != len(chunks) {
			t.Fatalf("run %d: chunk count changed (%d vs %d)", run, len(chunks), firstLen)
		}
		for i := range chunks {
			if firstTexts[i] != texts[i] {
				t.Fatalf("run %d: chunk[%d] text changed", run, i)
			}
		}
	}
}
