//
//  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 task

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"reflect"
	"testing"

	"gorm.io/gorm"
	"ragflow/internal/entity"
	"ragflow/internal/ingestion/component"
	"ragflow/internal/ingestion/pipeline"
)

// TestNewDebugTaskContext_InjectsDebugID asserts the debug context carries the
// side-effect-free markers: a fresh non-empty Doc.ID (a throwaway uuid, not a
// persisted row) and an empty KB (debug has no knowledgebase, so kb_id == "" is
// the debug signal used across the pipeline). The parser page cap is no longer
// stored as a flat ParserConfig key here — flat keys are dropped by the
// override_params merge and never reach the parser. It is injected at run time
// by injectDebugPageCap via Run's override_params channel (see
// TestInjectDebugPageCap).
func TestNewDebugTaskContext_InjectsDebugID(t *testing.T) {
	taskCtx := NewDebugTaskContext("t1", "canvas-1", "doc.pdf", []byte("page one\fpage two\fpage three"))

	if taskCtx.Doc.ID == "" {
		t.Errorf("Doc.ID = %q, want non-empty (uuid)", taskCtx.Doc.ID)
	}
	if taskCtx.Doc.ParserConfig != nil {
		t.Errorf("Doc.ParserConfig = %v, want nil (debug page cap is injected via override_params, not a flat ParserConfig key)", taskCtx.Doc.ParserConfig)
	}
	if taskCtx.Doc.KbID != "" {
		t.Errorf("Doc.KbID = %q, want empty (debug has no KB)", taskCtx.Doc.KbID)
	}
	if taskCtx.KB.ID != "" {
		t.Errorf("KB.ID = %q, want empty (debug has no KB)", taskCtx.KB.ID)
	}
	if taskCtx.Tenant.ID != "t1" {
		t.Errorf("Tenant.ID = %q, want t1", taskCtx.Tenant.ID)
	}
	if taskCtx.PipelineID != "canvas-1" {
		t.Errorf("PipelineID = %q, want canvas-1", taskCtx.PipelineID)
	}
}

// TestExecute_DebugViaEntry proves the entry-point constructor produces a
// valid debug TaskContext that routes through PipelineExecutor.Execute and
// returns the pipeline's chunks WITHOUT persisting (no index insert, no
// pipeline log).
func TestExecute_DebugViaEntry(t *testing.T) {
	taskCtx := NewDebugTaskContext("t1", "canvas-1", "doc.pdf", []byte("page one\fpage two\fpage three"))

	logCalled := false
	insertCalled := false

	exec, err := NewPipelineExecutor(taskCtx, "canvas-1", 0)
	if err != nil {
		t.Fatalf("NewPipelineExecutor: %v", err)
	}
	exec.
		WithLoadDSLFunc(func(ctx context.Context, canvasID string) (string, string, error) {
			return "dsl", "canvas-1", nil
		}).
		WithRunPipelineFunc(func(ctx context.Context, dsl string) (map[string]any, string, error) {
			return map[string]any{
				"chunks": []map[string]any{
					{"text": "c1"},
					{"text": "c2"},
					{"text": "c3"},
					{"text": "c4"},
				},
			}, dsl, nil
		}).
		WithLogCreateFunc(func(ctx context.Context, db *gorm.DB, log *entity.PipelineOperationLog) error {
			logCalled = true
			return nil
		}).
		WithInsertFunc(func(ctx context.Context, chunks []map[string]any, baseName, datasetID string) ([]string, error) {
			insertCalled = true
			return nil, nil
		})

	result, err := exec.Execute(context.Background())
	if err != nil {
		t.Fatalf("Execute: %v", err)
	}
	if result == nil {
		t.Fatal("result is nil")
	}
	if len(result.Chunks) != 4 {
		t.Errorf("len(result.Chunks) = %d, want 4", len(result.Chunks))
	}
	if logCalled {
		t.Error("pipeline log should NOT be created in a debug (kb_id == \"\") run")
	}
	if insertCalled {
		t.Error("chunk insert should NOT be called in a debug (kb_id == \"\") run")
	}
}

// TestInjectDebugPageCap verifies the canvas-debug page cap is delivered
// through Run's override_params channel (the existing ParserConfig shape),
// NOT through pipeline inputs. The cap must land at
// ParserConfig[cpnID][family]["pages"], expressed as the JSON-decoded
// []any{[]any{1, N}} form (a list of [from,to] pairs) — cpnID is the Parser
// component's instance id from the DSL and family is the document's filetype
// family. This is the exact shape NormalizeParserConfigPages produces after a
// storage JSON round-trip and the shape the deepdoc pdf parser consumes
// (NormalizePDFPages requires []any, not a Go [][]int).
//
// It also pins the regression: a flat top-level "pages" key would be dropped
// by the override_params merge and never reach the parser, so the cap must be
// nested under the cpnID.
func TestInjectDebugPageCap(t *testing.T) {
	templatePath := filepath.Join(taskRepoRoot(t), "internal", "ingestion", "pipeline", "template", "ingestion_pipeline_general.json")
	raw, err := os.ReadFile(templatePath)
	if err != nil {
		t.Fatalf("read template: %v", err)
	}
	var envelope struct {
		DSL json.RawMessage `json:"dsl"`
	}
	if err := json.Unmarshal(raw, &envelope); err != nil {
		t.Fatalf("unmarshal template envelope: %v", err)
	}
	dsl := string(envelope.DSL)

	// Discover the Parser cpnID the same way the executor does.
	schemas, err := pipeline.ExtractAllComponentParams(envelope.DSL)
	if err != nil {
		t.Fatalf("ExtractAllComponentParams: %v", err)
	}
	var parserCpnID string
	for _, s := range schemas {
		if s.ComponentName == component.ComponentNameParser {
			parserCpnID = s.CpnID
		}
	}
	if parserCpnID == "" {
		t.Fatal("template has no Parser component")
	}

	t.Run("pdf injects [1,2] under cpnID+family", func(t *testing.T) {
		parserConfig := map[string]any{}
		injectDebugPageCap(dsl, parserConfig, "pdf")
		famEntry, ok := parserConfig[parserCpnID].(map[string]any)
		if !ok {
			t.Fatalf("parserConfig[%q] = %T, want map[string]any", parserCpnID, parserConfig[parserCpnID])
		}
		pdf, ok := famEntry["pdf"].(map[string]any)
		if !ok {
			t.Fatalf("parserConfig[%q][\"pdf\"] = %T, want map[string]any", parserCpnID, famEntry["pdf"])
		}
		if !reflect.DeepEqual(pdf["pages"], []any{[]any{1, debugPageCapPages}}) {
			t.Errorf("parserConfig[%q][\"pdf\"][\"pages\"] = %v, want [[1, %d]]", parserCpnID, pdf["pages"], debugPageCapPages)
		}
	})

	t.Run("docx injects under docx family", func(t *testing.T) {
		parserConfig := map[string]any{}
		injectDebugPageCap(dsl, parserConfig, "docx")
		famEntry, ok := parserConfig[parserCpnID].(map[string]any)
		if !ok {
			t.Fatalf("parserConfig[%q] = %T, want map[string]any", parserCpnID, parserConfig[parserCpnID])
		}
		docx, ok := famEntry["docx"].(map[string]any)
		if !ok {
			t.Fatalf("parserConfig[%q][\"docx\"] = %T, want map[string]any", parserCpnID, famEntry["docx"])
		}
		if !reflect.DeepEqual(docx["pages"], []any{[]any{1, debugPageCapPages}}) {
			t.Errorf("parserConfig[%q][\"docx\"][\"pages\"] = %v, want [[1, %d]]", parserCpnID, docx["pages"], debugPageCapPages)
		}
	})

	t.Run("empty docType is a no-op", func(t *testing.T) {
		parserConfig := map[string]any{}
		injectDebugPageCap(dsl, parserConfig, "")
		if len(parserConfig) != 0 {
			t.Errorf("parserConfig = %v, want empty (no family derivable from empty docType)", parserConfig)
		}
	})

	t.Run("does not clobber existing parser params", func(t *testing.T) {
		parserConfig := map[string]any{
			parserCpnID: map[string]any{
				"pdf": map[string]any{"parse_method": "deepdoc"},
			},
		}
		injectDebugPageCap(dsl, parserConfig, "pdf")
		famEntry := parserConfig[parserCpnID].(map[string]any)
		pdf := famEntry["pdf"].(map[string]any)
		if pdf["parse_method"] != "deepdoc" {
			t.Errorf("parserConfig[%q][\"pdf\"][\"parse_method\"] = %v, want deepdoc (existing params must be preserved)", parserCpnID, pdf["parse_method"])
		}
		if !reflect.DeepEqual(pdf["pages"], []any{[]any{1, debugPageCapPages}}) {
			t.Errorf("parserConfig[%q][\"pdf\"][\"pages\"] = %v, want [[1, %d]]", parserCpnID, pdf["pages"], debugPageCapPages)
		}
	})

	t.Run("envelope dsl form (production shape)", func(t *testing.T) {
		// In production dsl is the canvas envelope {"dsl": {"components": ...}},
		// not the bare components map. injectDebugPageCap must still find the
		// Parser cpnID after unwrapping.
		wrapped := fmt.Sprintf(`{"dsl":%s}`, string(envelope.DSL))
		parserConfig := map[string]any{}
		injectDebugPageCap(wrapped, parserConfig, "pdf")
		famEntry, ok := parserConfig[parserCpnID].(map[string]any)
		if !ok {
			t.Fatalf("parserConfig[%q] = %T, want map[string]any (envelope dsl must unwrap)", parserCpnID, parserConfig[parserCpnID])
		}
		pdf, ok := famEntry["pdf"].(map[string]any)
		if !ok {
			t.Fatalf("parserConfig[%q][\"pdf\"] = %T, want map[string]any", parserCpnID, famEntry["pdf"])
		}
		if !reflect.DeepEqual(pdf["pages"], []any{[]any{1, debugPageCapPages}}) {
			t.Errorf("parserConfig[%q][\"pdf\"][\"pages\"] = %v, want [[1, %d]] (envelope dsl not unwrapped?)", parserCpnID, pdf["pages"], debugPageCapPages)
		}
	})

	t.Run("respects explicit caller-supplied cap", func(t *testing.T) {
		// When the document already carries an explicit cpnID+family page cap,
		// the debug default must NOT override it (so a wider/narrower cap wins).
		parserConfig := map[string]any{
			parserCpnID: map[string]any{
				"pdf": map[string]any{"pages": []any{[]any{1, 1000000}}},
			},
		}
		injectDebugPageCap(dsl, parserConfig, "pdf")
		famEntry := parserConfig[parserCpnID].(map[string]any)
		pdf := famEntry["pdf"].(map[string]any)
		if !reflect.DeepEqual(pdf["pages"], []any{[]any{1, 1000000}}) {
			t.Errorf("parserConfig[%q][\"pdf\"][\"pages\"] = %v, want [[1, 1000000]] (explicit cap must be respected, not overridden by debug default)", parserCpnID, pdf["pages"])
		}
	})
}
