// ingestion/internal/api/handler_test.go
package api_test

import (
	"bytes"
	"context"
	"encoding/json"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/mathiasbq/hyperguild/ingestion/internal/api"
	"github.com/mathiasbq/hyperguild/ingestion/internal/pipeline"
)

// stubComplete returns a fixed JSON page so tests never call a real LLM.
func stubComplete(_ context.Context, _, _ string) (string, error) {
	return `[{"path":"wiki/sources/test-source.md","content":"# Test Source\n\nSome content here.\n"}]`, nil
}

func stubPipelineCfg() pipeline.Config {
	return pipeline.Config{
		Complete:  stubComplete,
		ChunkSize: 0,
		Schema:    "# Test Schema\nwiki/sources/, wiki/concepts/, wiki/entities/",
	}
}

func setup(t *testing.T) (string, *api.Handler) {
	t.Helper()
	dir := t.TempDir()
	require.NoError(t, os.MkdirAll(filepath.Join(dir, "knowledge"), 0o755))
	require.NoError(t, os.WriteFile(
		filepath.Join(dir, "knowledge", "tdd.md"),
		[]byte("---\ntitle: TDD\ndomain: software\n---\n\nTest-driven development is a discipline.\n"),
		0o644,
	))
	logger := slog.New(slog.NewTextHandler(os.Stderr, nil))
	return dir, api.NewHandler(dir, logger, stubPipelineCfg())
}

// ---------------------------------------------------------------------------
// Existing tests (Write / Query)
// ---------------------------------------------------------------------------

func TestQuery_ReturnsResults(t *testing.T) {
	_, h := setup(t)
	body, _ := json.Marshal(map[string]any{"query": "test driven", "limit": 5})
	req := httptest.NewRequest(http.MethodPost, "/query", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.Query(rec, req)

	assert.Equal(t, http.StatusOK, rec.Code)
	var resp map[string]any
	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
	results := resp["results"].([]any)
	assert.NotEmpty(t, results)
}

func TestWrite_CreatesKnowledgeFile(t *testing.T) {
	dir, h := setup(t)
	body, _ := json.Marshal(map[string]any{
		"content":  "# Test note\n\nSome content.",
		"filename": "test-note.md",
	})
	req := httptest.NewRequest(http.MethodPost, "/write", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.Write(rec, req)

	assert.Equal(t, http.StatusOK, rec.Code)
	var resp map[string]string
	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
	assert.NotEmpty(t, resp["path"])

	content, err := os.ReadFile(filepath.Join(dir, "knowledge", "test-note.md"))
	require.NoError(t, err)
	assert.Contains(t, string(content), "Some content.")
}

func TestQuery_RequiresQuery(t *testing.T) {
	_, h := setup(t)
	body, _ := json.Marshal(map[string]any{"limit": 5})
	req := httptest.NewRequest(http.MethodPost, "/query", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.Query(rec, req)

	assert.Equal(t, http.StatusBadRequest, rec.Code)
}

func TestWrite_IncludesFrontmatterWhenTypeProvided(t *testing.T) {
	dir, h := setup(t)
	body, _ := json.Marshal(map[string]any{
		"content":  "Some learning.",
		"filename": "typed-note.md",
		"type":     "concept",
		"domain":   "software",
	})
	req := httptest.NewRequest(http.MethodPost, "/write", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.Write(rec, req)

	assert.Equal(t, http.StatusOK, rec.Code)
	content, err := os.ReadFile(filepath.Join(dir, "knowledge", "typed-note.md"))
	require.NoError(t, err)
	assert.Contains(t, string(content), "type: concept")
	assert.Contains(t, string(content), "domain: software")
	assert.Contains(t, string(content), "Some learning.")
}

func TestWrite_GeneratesFilenameIfAbsent(t *testing.T) {
	dir, h := setup(t)
	body, _ := json.Marshal(map[string]any{"content": "auto name"})
	req := httptest.NewRequest(http.MethodPost, "/write", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.Write(rec, req)

	assert.Equal(t, http.StatusOK, rec.Code)
	entries, _ := os.ReadDir(filepath.Join(dir, "knowledge"))
	// +1 because setup already wrote tdd.md
	assert.Len(t, entries, 2)
	assert.True(t, strings.HasSuffix(entries[1].Name(), ".md"))
}

// ---------------------------------------------------------------------------
// POST /ingest
// ---------------------------------------------------------------------------

func TestIngest_MissingContent(t *testing.T) {
	_, h := setup(t)
	body, _ := json.Marshal(map[string]any{"source": "test-source"})
	req := httptest.NewRequest(http.MethodPost, "/ingest", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.Ingest(rec, req)

	assert.Equal(t, http.StatusBadRequest, rec.Code)
}

func TestIngest_MissingSource(t *testing.T) {
	_, h := setup(t)
	body, _ := json.Marshal(map[string]any{"content": "some content"})
	req := httptest.NewRequest(http.MethodPost, "/ingest", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.Ingest(rec, req)

	assert.Equal(t, http.StatusBadRequest, rec.Code)
}

func TestIngest_Success(t *testing.T) {
	_, h := setup(t)
	body, _ := json.Marshal(map[string]any{
		"content": "some content about shape-up methodology",
		"source":  "shape-up-book",
		"dry_run": true,
	})
	req := httptest.NewRequest(http.MethodPost, "/ingest", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.Ingest(rec, req)

	require.Equal(t, http.StatusOK, rec.Code)
	var resp map[string]any
	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
	pages, ok := resp["pages"]
	require.True(t, ok, "response must have pages field")
	pagesSlice, ok := pages.([]any)
	require.True(t, ok, "pages must be an array")
	assert.NotEmpty(t, pagesSlice)
}

// ---------------------------------------------------------------------------
// POST /ingest-path
// ---------------------------------------------------------------------------

func TestIngestPath_MissingPath(t *testing.T) {
	_, h := setup(t)
	body, _ := json.Marshal(map[string]any{"source": "test-source"})
	req := httptest.NewRequest(http.MethodPost, "/ingest-path", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.IngestPath(rec, req)

	assert.Equal(t, http.StatusBadRequest, rec.Code)
}

func TestIngestPath_File(t *testing.T) {
	_, h := setup(t)

	// Create a temp file with content
	dir := t.TempDir()
	f := filepath.Join(dir, "doc.md")
	require.NoError(t, os.WriteFile(f, []byte("# Hello\nThis is markdown content."), 0o644))

	body, _ := json.Marshal(map[string]any{
		"path":    f,
		"source":  "test-doc",
		"dry_run": true,
	})
	req := httptest.NewRequest(http.MethodPost, "/ingest-path", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.IngestPath(rec, req)

	require.Equal(t, http.StatusOK, rec.Code)
	var resp map[string]any
	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
	pages, ok := resp["pages"]
	require.True(t, ok, "response must have pages field")
	pagesSlice, ok := pages.([]any)
	require.True(t, ok, "pages must be an array")
	assert.NotEmpty(t, pagesSlice)
}

func TestIngestPath_Directory(t *testing.T) {
	_, h := setup(t)

	// Create a temp dir with one .md file
	dir := t.TempDir()
	require.NoError(t, os.WriteFile(filepath.Join(dir, "notes.md"), []byte("# Notes\nSome notes."), 0o644))

	body, _ := json.Marshal(map[string]any{
		"path":    dir,
		"dry_run": true,
	})
	req := httptest.NewRequest(http.MethodPost, "/ingest-path", bytes.NewReader(body))
	rec := httptest.NewRecorder()

	h.IngestPath(rec, req)

	require.Equal(t, http.StatusOK, rec.Code)
	var resp map[string]any
	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
	pages, ok := resp["pages"]
	require.True(t, ok, "response must have pages field")
	pagesSlice, ok := pages.([]any)
	require.True(t, ok, "pages must be an array")
	assert.NotEmpty(t, pagesSlice)
}