package app

import (
	"context"
	"fmt"
	"io"
	"strings"

	"gitea.maximumdirect.net/eric/narratio/internal/adapters/storage"
	"gitea.maximumdirect.net/eric/narratio/internal/artifactpolicy"
	"gitea.maximumdirect.net/eric/narratio/internal/artifacts"
	"gitea.maximumdirect.net/eric/narratio/internal/config"
)

func buildHelperArtifactCatalog(cfg *config.Config) (*artifacts.ArtifactCatalog, error) {
	catalog := artifacts.NewArtifactCatalog()
	if err := catalog.RegisterBuiltIns(); err != nil {
		return nil, err
	}
	configured := map[string]artifacts.ConfiguredArtifactDefinition{}
	if cfg.Pipeline.Scriptorium != nil {
		for key, item := range cfg.Pipeline.Scriptorium.Artifacts {
			configured[key] = artifacts.ConfiguredArtifactDefinition{Enabled: item.Enabled, OutputPath: item.OutputPath}
		}
	}
	if err := catalog.RegisterConfiguredArtifacts(configured, nil); err != nil {
		return nil, err
	}
	return catalog, nil
}

func writeArtifactList(out io.Writer, cfg *config.Config, catalog *artifacts.ArtifactCatalog, locks *effectiveLocks, publishedRemoteState map[string]string) {
	lockSet := lockSourceSet(locks.All)
	fmt.Fprintln(out, "Built-in:")
	for _, id := range []string{
		artifacts.ArtifactTranscriptBase,
		artifacts.ArtifactTranscriptPolished,
		artifacts.ArtifactTranscriptFinal,
		artifacts.ArtifactTranscriptFinalTrimmed,
		artifacts.ArtifactBoundsSession,
	} {
		writeArtifactLine(out, id, lockSet)
	}
	fmt.Fprintln(out, "Configured:")
	for _, entry := range catalog.ListConfigured() {
		writeArtifactLine(out, entry.SourceID, lockSet)
	}
	fmt.Fprintln(out, "Previous-session:")
	for _, req := range artifacts.CollectPreviousArtifactRequirements(configuredScriptoriumArtifacts(cfg)) {
		fmt.Fprintf(out, "- %s required=%t\n", artifactpolicy.PreviousSessionSourceID(req.Name), req.Required)
	}
	fmt.Fprintln(out, "Published:")
	for _, rule := range cfg.Pipeline.Publish.Outputs {
		writePublishedOutputLine(out, rule, catalog, lockSet, publishedRemoteState)
	}
}

func writeArtifactLine(out io.Writer, source string, lockSet map[string]config.PublishLockRule) {
	parts := []string{source}
	if _, ok := lockSet[source]; ok {
		parts = append(parts, "locked")
	}
	fmt.Fprintf(out, "- %s\n", strings.Join(parts, " "))
}

func writePublishedOutputLine(out io.Writer, rule config.PublishOutputRule, catalog *artifacts.ArtifactCatalog, lockSet map[string]config.PublishLockRule, remoteState map[string]string) {
	source := strings.TrimSpace(rule.Source)
	parts := []string{source}
	if _, ok := lockSet[source]; ok {
		parts = append(parts, "locked")
	}
	dest, showDest, err := helperPublishedOutputDest(rule, catalog)
	if err != nil {
		parts = append(parts, "remote=error")
		fmt.Fprintf(out, "- %s\n", strings.Join(parts, " "))
		return
	}
	if showDest {
		parts = append(parts, "dest="+dest)
	}
	if state := remoteState[publishedOutputRemoteStateKey(source, dest)]; state != "" {
		parts = append(parts, state)
	}
	fmt.Fprintf(out, "- %s\n", strings.Join(parts, " "))
}

func remotePublishedOutputAvailability(ctx context.Context, cfg *config.Config, store storage.ObjectStore, catalog *artifacts.ArtifactCatalog) map[string]string {
	out := map[string]string{}
	sessionPrefix := artifacts.S3SessionPrefix(cfg.Pipeline.Storage.S3.RootPrefix, cfg.Session.Campaign, cfg.Session.SessionID)
	for _, rule := range cfg.Pipeline.Publish.Outputs {
		source := strings.TrimSpace(rule.Source)
		dest, _, err := helperPublishedOutputDest(rule, catalog)
		if err != nil {
			out[publishedOutputRemoteStateKey(source, "")] = "remote=error"
			continue
		}
		key := artifacts.S3PublishedOutputKey(sessionPrefix, dest)
		if exists, err := store.Exists(ctx, key); err == nil && exists {
			out[publishedOutputRemoteStateKey(source, dest)] = "remote=published"
		} else if err != nil {
			out[publishedOutputRemoteStateKey(source, dest)] = "remote=error"
		} else {
			out[publishedOutputRemoteStateKey(source, dest)] = "remote=missing"
		}
	}
	return out
}

func helperPublishedOutputDest(rule config.PublishOutputRule, catalog *artifacts.ArtifactCatalog) (string, bool, error) {
	source := strings.TrimSpace(rule.Source)
	normalized, err := artifactpolicy.ResolvePublishedDestination(source, rule.Dest, helperConfiguredOutputPathMap(catalog))
	if err != nil {
		return "", false, err
	}
	entry, ok := catalog.Lookup(source)
	showDest := !ok || strings.TrimSpace(entry.CanonicalRelPath) != normalized
	return normalized, showDest, nil
}

func helperConfiguredOutputPathMap(catalog *artifacts.ArtifactCatalog) map[string]string {
	out := map[string]string{}
	if catalog == nil {
		return out
	}
	for _, entry := range catalog.ListConfigured() {
		if strings.TrimSpace(entry.ConfiguredKey) == "" {
			continue
		}
		out[entry.ConfiguredKey] = strings.TrimSpace(entry.CanonicalRelPath)
	}
	return out
}

func publishedOutputRemoteStateKey(source, dest string) string {
	return strings.TrimSpace(source) + "\x00" + strings.TrimSpace(dest)
}