package config

import (
	"gitea.maximumdirect.net/eric/notarius/internal/core/diagnostics"
	"gitea.maximumdirect.net/eric/notarius/internal/framework/pipeline"
)

const SupportedFileConfigVersion = 1

type Config struct {
	LLMProfiles map[string]LLMProfile               `json:"llm_profiles"`
	Pipelines   map[string]pipeline.PipelineProfile `json:"pipelines"`
	Concurrency ConcurrencyConfig                   `json:"concurrency"`
	Diagnostics DiagnosticsConfig                   `json:"diagnostics"`
}

type LLMProfile struct {
	Provider       string `json:"provider,omitempty"`
	BaseURL        string `json:"base_url,omitempty"`
	Model          string `json:"model,omitempty"`
	APIKey         string `json:"api_key,omitempty"`
	APIKeyEnv      string `json:"api_key_env,omitempty"`
	TimeoutSeconds int    `json:"timeout_seconds,omitempty"`
	MaxRetries     int    `json:"max_retries,omitempty"`
	MaxConcurrency int    `json:"max_concurrency,omitempty"`
}

type ConcurrencyConfig struct {
	TotalLLM int `json:"total_llm"`
}

type DiagnosticsConfig struct {
	WorkDir   string                    `json:"work_dir"`
	Retention diagnostics.RetentionMode `json:"retention"`
}

func Default() Config {
	return Config{
		LLMProfiles: map[string]LLMProfile{
			pipeline.DefaultLLMProfile: {
				Provider:       "openai-compatible",
				TimeoutSeconds: 600,
				MaxRetries:     3,
				MaxConcurrency: 1,
			},
		},
		Pipelines: map[string]pipeline.PipelineProfile{},
		Concurrency: ConcurrencyConfig{
			TotalLLM: 1,
		},
		Diagnostics: DiagnosticsConfig{
			WorkDir:   "/tmp/notarius",
			Retention: diagnostics.RetentionAuto,
		},
	}
}

func cloneConfig(in Config) Config {
	out := in
	out.LLMProfiles = make(map[string]LLMProfile, len(in.LLMProfiles))
	for key, profile := range in.LLMProfiles {
		out.LLMProfiles[key] = profile
	}
	out.Pipelines = make(map[string]pipeline.PipelineProfile, len(in.Pipelines))
	for key, profile := range in.Pipelines {
		out.Pipelines[key] = clonePipelineProfile(profile)
	}
	return out
}

func clonePipelineProfile(in pipeline.PipelineProfile) pipeline.PipelineProfile {
	out := in
	out.Input = cloneModuleBinding(in.Input)
	out.Chunk = cloneModuleBinding(in.Chunk)
	out.Output = cloneModuleBinding(in.Output)
	out.References = cloneStringMap(in.References)
	if len(in.Artifacts) > 0 {
		out.Artifacts = make(map[string]pipeline.ArtifactLaneProfile, len(in.Artifacts))
		for key, lane := range in.Artifacts {
			out.Artifacts[key] = cloneArtifactLaneProfile(lane)
		}
	}
	return out
}

func cloneArtifactLaneProfile(in pipeline.ArtifactLaneProfile) pipeline.ArtifactLaneProfile {
	out := in
	out.Extract = cloneModuleBinding(in.Extract)
	out.Merge = cloneModuleBinding(in.Merge)
	out.Normalize = cloneModuleBinding(in.Normalize)
	out.References = cloneStringMap(in.References)
	if len(in.Validators) > 0 {
		out.Validators = make([]pipeline.ModuleBinding, len(in.Validators))
		for i, binding := range in.Validators {
			out.Validators[i] = cloneModuleBinding(binding)
		}
	}
	return out
}

func cloneStringMap(in map[string]string) map[string]string {
	if len(in) == 0 {
		return nil
	}
	out := make(map[string]string, len(in))
	for key, value := range in {
		out[key] = value
	}
	return out
}

func cloneModuleBinding(in pipeline.ModuleBinding) pipeline.ModuleBinding {
	out := in
	if len(in.Options) > 0 {
		out.Options = cloneOptions(in.Options)
	}
	return out
}

func cloneOptions(in map[string]any) map[string]any {
	if len(in) == 0 {
		return nil
	}
	out := make(map[string]any, len(in))
	for key, value := range in {
		out[key] = cloneOptionValue(value)
	}
	return out
}

func cloneOptionValue(value any) any {
	switch typed := value.(type) {
	case map[string]any:
		return cloneOptions(typed)
	case []any:
		out := make([]any, len(typed))
		for i, item := range typed {
			out[i] = cloneOptionValue(item)
		}
		return out
	default:
		return typed
	}
}