package app

import (
	"context"
	"errors"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"gitea.maximumdirect.net/eric/weatherreporter/internal/config"
)

func TestRunBatchDetailedKeepsSuccessfulOutputAndSkipsNotificationAfterPartialFailure(t *testing.T) {
	bundle := generationBundle(t)
	bundle.Hourly.Periods = bundle.Hourly.Periods[:1]
	notifier := &generationNotifier{}
	executor := &generationExecutor{failedPrompt: generationDefinitionForPrompt("weather.tomorrow_generated_text").PromptID}
	result, err := RunBatchDetailed(context.Background(), BatchRequest{
		Config: generationDistributorConfig(), Batch: BatchMorning,
		Now: generationTime("2026-05-29T08:30:00-05:00"), WorkingDir: t.TempDir(), OutputDir: t.TempDir(),
		Collector: &generationCollector{bundle: &bundle}, Executor: executor, Notifier: notifier,
	})
	if err != nil || result == nil || result.Total != 2 || result.Succeeded != 1 || result.Failed != 1 || result.Notification == nil || result.Notification.Status != "skipped" || notifier.batchCalls != 0 {
		t.Fatalf("RunBatchDetailed() result/error/notifier = %#v/%v/%#v", result, err, notifier)
	}
	if result.Reports[0].Status != "succeeded" || result.Reports[0].OutputPath == "" || result.Reports[1].Status != "failed" || result.Reports[1].OutputPath != "" {
		t.Fatalf("report results = %#v", result.Reports)
	}
	if data, readErr := os.ReadFile(result.Reports[0].OutputPath); readErr != nil || len(data) == 0 {
		t.Fatalf("successful output = %q, error = %v", data, readErr)
	}
}

func TestRunBatchDetailedNotifiesOnlyAfterAllOutputsExist(t *testing.T) {
	bundle := generationBundle(t)
	bundle.Hourly.Periods = bundle.Hourly.Periods[:1]
	outputDir := t.TempDir()
	notifier := &generationNotifier{}
	result, err := RunBatchDetailed(context.Background(), BatchRequest{
		Config: generationDistributorConfig(), Batch: BatchMorning,
		Now: generationTime("2026-05-29T08:30:00-05:00"), WorkingDir: t.TempDir(), OutputDir: outputDir,
		Collector: &generationCollector{bundle: &bundle}, Executor: &generationExecutor{}, Notifier: notifier,
	})
	if err != nil || result == nil || result.Total != 2 || result.Succeeded != 2 || result.Failed != 0 || notifier.batchCalls != 1 || result.Notification == nil || result.Notification.Status != "succeeded" {
		t.Fatalf("RunBatchDetailed() result/error/notifier = %#v/%v/%#v", result, err, notifier)
	}
	if len(notifier.batchRequest.Files) < 2 || len(notifier.batchRequest.IncludedReports) != 2 {
		t.Fatalf("batch notification = %#v", notifier.batchRequest)
	}
	if result.Reports[0].OutputPath == result.Reports[1].OutputPath {
		t.Fatalf("batch reports share output path %q", result.Reports[0].OutputPath)
	}
	for _, file := range notifier.batchRequest.Files {
		if filepath.Dir(file.SourcePath) != outputDir || file.BundlePath == "" {
			t.Fatalf("notification file = %#v", file)
		}
		if _, statErr := os.Stat(file.SourcePath); statErr != nil {
			t.Fatalf("notification source %q: %v", file.SourcePath, statErr)
		}
	}
}

func TestRunBatchDetailedRejectsUnsupportedDistributorEndpointBeforeWork(t *testing.T) {
	outputDir := t.TempDir()
	cfg := generationDistributorConfig()
	cfg.Notify.Distributor.Endpoint = "ftp://distributor.example.test"
	bundle := generationBundle(t)
	collector := &generationCollector{bundle: &bundle}
	executor := &generationExecutor{}
	notifier := &generationNotifier{}

	result, err := RunBatchDetailed(context.Background(), BatchRequest{
		Config: cfg, Batch: BatchMorning,
		Now: generationTime("2026-05-29T08:30:00-05:00"), WorkingDir: t.TempDir(), OutputDir: outputDir,
		Collector: collector, Executor: executor, Notifier: notifier,
	})
	if err == nil || result != nil || collector.called || executor.promptInspections != 0 || executor.called || notifier.calls != 0 || notifier.batchCalls != 0 {
		t.Fatalf("RunBatchDetailed() result/error/collector/executor/notifier = %#v/%v/%t/%#v/%#v", result, err, collector.called, executor, notifier)
	}
	entries, readErr := os.ReadDir(outputDir)
	if readErr != nil || len(entries) != 0 {
		t.Fatalf("output directory entries/error = %v/%v", entries, readErr)
	}
}

func TestRunBatchDetailedUsesDefaultAndConfiguredOutputDirectories(t *testing.T) {
	tests := []struct {
		name      string
		directory func(t *testing.T, workingDir string) string
		wantDir   func(t *testing.T, workingDir string, configuredDir string) string
	}{
		{
			name: "working directory default",
			directory: func(_ *testing.T, _ string) string {
				return ""
			},
			wantDir: func(_ *testing.T, workingDir string, _ string) string {
				return workingDir
			},
		},
		{
			name: "absolute directory",
			directory: func(t *testing.T, _ string) string {
				return filepath.Join(t.TempDir(), "reports")
			},
			wantDir: func(_ *testing.T, _ string, configuredDir string) string {
				return configuredDir
			},
		},
		{
			name: "relative directory",
			directory: func(_ *testing.T, _ string) string {
				return "configured/../reports"
			},
			wantDir: func(_ *testing.T, workingDir string, _ string) string {
				return filepath.Join(workingDir, "reports")
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			workingDir := t.TempDir()
			configuredDir := tt.directory(t, workingDir)
			cfg := generationDistributorConfig()
			cfg.Output.Directory = configuredDir
			bundle := generationBundle(t)
			bundle.Hourly.Periods = bundle.Hourly.Periods[:1]
			notifier := &generationNotifier{}

			result, err := RunBatchDetailed(context.Background(), BatchRequest{
				Config: cfg, Batch: BatchMorning,
				Now: generationTime("2026-05-29T08:30:00-05:00"), WorkingDir: workingDir,
				Collector: &generationCollector{bundle: &bundle}, Executor: &generationExecutor{}, Notifier: notifier,
			})
			wantDir := tt.wantDir(t, workingDir, configuredDir)
			if err != nil || result == nil || result.Succeeded != len(result.Reports) || notifier.batchCalls != 1 {
				t.Fatalf("RunBatchDetailed() result/error/notifier = %#v/%v/%#v", result, err, notifier)
			}
			for _, item := range result.Reports {
				if filepath.Dir(item.OutputPath) != wantDir {
					t.Fatalf("report output %q, want directory %q", item.OutputPath, wantDir)
				}
			}
			for _, file := range notifier.batchRequest.Files {
				if filepath.Dir(file.SourcePath) != wantDir {
					t.Fatalf("notification source %q, want directory %q", file.SourcePath, wantDir)
				}
			}
		})
	}
}

func TestRunBatchDetailedExplicitOutputDirectoryIgnoresConfiguredDirectory(t *testing.T) {
	configuredPath := filepath.Join(t.TempDir(), "not-a-directory")
	if err := os.WriteFile(configuredPath, []byte("not a directory"), 0o600); err != nil {
		t.Fatal(err)
	}
	explicitDir := t.TempDir()
	cfg := generationDistributorConfig()
	cfg.Output.Directory = configuredPath
	bundle := generationBundle(t)
	bundle.Hourly.Periods = bundle.Hourly.Periods[:1]

	result, err := RunBatchDetailed(context.Background(), BatchRequest{
		Config: cfg, Batch: BatchMorning,
		Now: generationTime("2026-05-29T08:30:00-05:00"), WorkingDir: t.TempDir(), OutputDir: explicitDir,
		Collector: &generationCollector{bundle: &bundle}, Executor: &generationExecutor{}, Notifier: &generationNotifier{},
	})
	if err != nil || result == nil || result.Succeeded != len(result.Reports) {
		t.Fatalf("RunBatchDetailed() result/error = %#v/%v", result, err)
	}
	for _, item := range result.Reports {
		if filepath.Dir(item.OutputPath) != explicitDir {
			t.Fatalf("report output %q, want directory %q", item.OutputPath, explicitDir)
		}
	}
}

func TestRunBatchDetailedPreflightsAllOutputPaths(t *testing.T) {
	bundle := generationBundle(t)
	bundle.Hourly.Periods = bundle.Hourly.Periods[:1]
	outputDir := t.TempDir()
	if err := os.Mkdir(filepath.Join(outputDir, "tomorrow.md"), 0o700); err != nil {
		t.Fatal(err)
	}
	todayPath := filepath.Join(outputDir, "today.md")
	const previousReport = "previous report"
	if err := os.WriteFile(todayPath, []byte(previousReport), 0o600); err != nil {
		t.Fatal(err)
	}
	executor := &generationExecutor{}
	promptInspectedBeforeCollection := false
	collector := &generationCollector{
		bundle: &bundle,
		beforeRun: func() {
			promptInspectedBeforeCollection = executor.promptInspections > 0
		},
	}
	result, err := RunBatchDetailed(context.Background(), BatchRequest{
		Config: generationDistributorConfig(), Batch: BatchMorning,
		Now: generationTime("2026-05-29T08:30:00-05:00"), WorkingDir: t.TempDir(), OutputDir: outputDir,
		Collector: collector, Executor: executor, Notifier: &generationNotifier{},
	})
	if err == nil || result != nil || !collector.called || !promptInspectedBeforeCollection || executor.called {
		t.Fatalf("RunBatchDetailed() result/error/collection/inspection/execution = %#v/%v/%t/%t/%t", result, err, collector.called, promptInspectedBeforeCollection, executor.called)
	}
	if data, readErr := os.ReadFile(todayPath); readErr != nil || string(data) != previousReport {
		t.Fatalf("earlier output = %q, error = %v", data, readErr)
	}
	if info, statErr := os.Stat(filepath.Join(outputDir, "tomorrow.md")); statErr != nil || !info.IsDir() {
		t.Fatalf("blocked output info/error = %#v/%v", info, statErr)
	}
}

func TestRunBatchDetailedRetainsReportCountsWhenNotificationFails(t *testing.T) {
	bundle := generationBundle(t)
	bundle.Hourly.Periods = bundle.Hourly.Periods[:1]
	outputDir := t.TempDir()
	notifier := &generationNotifier{batchErr: errors.New("distributor unavailable")}
	result, err := RunBatchDetailed(context.Background(), BatchRequest{
		Config: generationDistributorConfig(), Batch: BatchMorning,
		Now: generationTime("2026-05-29T08:30:00-05:00"), WorkingDir: t.TempDir(), OutputDir: outputDir,
		Collector: &generationCollector{bundle: &bundle}, Executor: &generationExecutor{}, Notifier: notifier,
	})
	if err != nil || result == nil || result.Total != len(result.Reports) || result.Succeeded != len(result.Reports) || result.Failed != 0 || result.Notification == nil || result.Notification.Status != "failed" {
		t.Fatalf("RunBatchDetailed() result/error = %#v/%v", result, err)
	}
	for _, item := range result.Reports {
		if item.Status != "succeeded" || item.OutputPath == "" {
			t.Fatalf("report result = %#v", item)
		}
		if _, statErr := os.Stat(item.OutputPath); statErr != nil {
			t.Fatalf("published output %q: %v", item.OutputPath, statErr)
		}
	}
}

func TestRunBatchReturnsNotificationFailureWithoutReportFailureWording(t *testing.T) {
	bundle := generationBundle(t)
	bundle.Hourly.Periods = bundle.Hourly.Periods[:1]
	err := RunBatch(context.Background(), BatchRequest{
		Config: generationDistributorConfig(), Batch: BatchMorning,
		Now: generationTime("2026-05-29T08:30:00-05:00"), WorkingDir: t.TempDir(), OutputDir: t.TempDir(),
		Collector: &generationCollector{bundle: &bundle}, Executor: &generationExecutor{}, Notifier: &generationNotifier{batchErr: errors.New("distributor unavailable")},
	})
	var batchErr BatchError
	if !errors.As(err, &batchErr) || batchErr.Result == nil || batchErr.Result.Failed != 0 || batchErr.Result.Notification == nil || batchErr.Result.Notification.Status != "failed" || !strings.Contains(err.Error(), "notification failed") || strings.Contains(err.Error(), "reports failed") {
		t.Fatalf("RunBatch() error/result = %v/%#v", err, batchErr.Result)
	}
}

func generationDistributorConfig() config.Config {
	cfg := generationConfig()
	cfg.Notify.Distributor.Enabled = true
	cfg.Notify.Distributor.PipelineIDTemplate = "weather"
	return cfg
}