package config

import (
	"bytes"
	"encoding/json"
	"fmt"
	"sort"
	"strings"
)

// effectivePipelineProjection is the single safe, schema-specific view used
// for inspection, comparison, and identity. Runtime metadata and unresolved
// family declarations have no slot in this type.
type effectivePipelineProjection struct {
	Workspace    WorkspaceConfig             `yaml:"workspace" json:"workspace"`
	Campaigns    CampaignsConfig             `yaml:"campaigns" json:"campaigns"`
	Storage      StorageConfig               `yaml:"storage" json:"storage"`
	Spool        SpoolConfig                 `yaml:"spool" json:"spool"`
	Cache        CacheConfig                 `yaml:"cache" json:"cache"`
	Publish      *PublishConfig              `yaml:"publish" json:"publish"`
	WhisperX     WhisperXConfig              `yaml:"whisperx" json:"whisperx"`
	Seriatim     SeriatimConfig              `yaml:"seriatim" json:"seriatim"`
	Audita       AuditaConfig                `yaml:"audita" json:"audita"`
	Normalize    *NormalizeConfig            `yaml:"normalize" json:"normalize"`
	Trim         *TrimConfig                 `yaml:"trim" json:"trim"`
	Render       *RenderConfig               `yaml:"render" json:"render"`
	Scriptorium  *effectiveScriptoriumConfig `yaml:"scriptorium" json:"scriptorium"`
	Notarius     *NotariusConfig             `yaml:"notarius" json:"notarius"`
	Notification NotificationConfig          `yaml:"notification" json:"notification"`
}

type effectiveScriptoriumConfig struct {
	Credentials []string                             `yaml:"credentials,omitempty" json:"credentials,omitempty"`
	Binary      string                               `yaml:"binary" json:"binary"`
	ConfigPath  string                               `yaml:"config_path" json:"config_path"`
	Timeout     string                               `yaml:"timeout" json:"timeout"`
	RenderDebug bool                                 `yaml:"render_debug" json:"render_debug"`
	Artifacts   map[string]ScriptoriumArtifactConfig `yaml:"artifacts" json:"artifacts"`
}

type projectedPipelineValue struct {
	record   EffectivePipelineValueRecord
	segments []string
}

func projectEffectivePipeline(cfg *PipelineConfig, logicalNotarius bool) effectivePipelineProjection {
	projection := effectivePipelineProjection{
		Workspace: cfg.Workspace, Campaigns: cfg.Campaigns, Storage: cfg.Storage,
		Spool: cfg.Spool, Cache: cfg.Cache, Publish: cfg.Publish,
		WhisperX: cfg.WhisperX, Seriatim: cfg.Seriatim, Audita: cfg.Audita,
		Normalize: cfg.Normalize, Trim: cfg.Trim, Render: cfg.Render,
		Notarius: cfg.Notarius, Notification: cfg.Notification,
	}
	if cfg.Scriptorium != nil {
		projection.Scriptorium = &effectiveScriptoriumConfig{
			Credentials: secretReferenceNames(cfg.Scriptorium.Credentials),
			Binary:      cfg.Scriptorium.Binary, ConfigPath: cfg.Scriptorium.ConfigPath,
			Timeout: cfg.Scriptorium.Timeout, RenderDebug: cfg.Scriptorium.RenderDebug,
			Artifacts: cfg.Scriptorium.Artifacts,
		}
	}
	if logicalNotarius && cfg.Notarius != nil && cfg.resolution != nil && cfg.resolution.logicalNotariusCaptured {
		notarius := *cfg.Notarius
		notarius.ConfigPath = cfg.resolution.logicalNotariusConfig
		notarius.WorkingDirectory = cfg.resolution.logicalNotariusWorking
		projection.Notarius = &notarius
	}
	return projection
}

func projectionJSON(projection effectivePipelineProjection) ([]byte, error) {
	data, err := json.Marshal(projection)
	if err != nil {
		return nil, fmt.Errorf("encode effective pipeline projection: %w", err)
	}
	return data, nil
}

func projectionValueTree(value any) (any, error) {
	data, err := json.Marshal(value)
	if err != nil {
		return nil, fmt.Errorf("encode typed pipeline projection: %w", err)
	}
	decoder := json.NewDecoder(bytes.NewReader(data))
	decoder.UseNumber()
	var root any
	if err := decoder.Decode(&root); err != nil {
		return nil, fmt.Errorf("decode effective pipeline projection: %w", err)
	}
	return root, nil
}

func projectionValueRecords(projection effectivePipelineProjection) ([]EffectivePipelineValueRecord, error) {
	detailed, err := projectionDetailedRecords(projection)
	if err != nil {
		return nil, err
	}
	records := make([]EffectivePipelineValueRecord, 0, len(detailed))
	for _, value := range detailed {
		records = append(records, value.record)
	}
	return records, nil
}

func projectionDetailedRecords(value any) ([]projectedPipelineValue, error) {
	decoded, err := projectionValueTree(value)
	if err != nil {
		return nil, err
	}
	root, ok := decoded.(map[string]any)
	if !ok {
		return nil, fmt.Errorf("effective pipeline projection must be a mapping")
	}
	var records []projectedPipelineValue
	appendProjectionRecords(&records, nil, root)
	sort.Slice(records, func(i, j int) bool { return records[i].record.Path < records[j].record.Path })
	return records, nil
}

func appendProjectionRecords(records *[]projectedPipelineValue, segments []string, value any) {
	if mapping, ok := value.(map[string]any); ok && len(mapping) > 0 {
		keys := make([]string, 0, len(mapping))
		for key := range mapping {
			keys = append(keys, key)
		}
		sort.Strings(keys)
		for _, key := range keys {
			child := append(append([]string(nil), segments...), key)
			appendProjectionRecords(records, child, mapping[key])
		}
		return
	}
	encoded, _ := json.Marshal(value)
	path := strings.Join(segments, ".")
	*records = append(*records, projectedPipelineValue{
		record:   EffectivePipelineValueRecord{Path: path, Value: string(encoded)},
		segments: append([]string(nil), segments...),
	})
}