package app

import (
	"fmt"
	"io"
	"strings"

	"gitea.maximumdirect.net/eric/distributor/internal/config"
	"gitea.maximumdirect.net/eric/distributor/internal/publish"
	"gitea.maximumdirect.net/eric/distributor/internal/storage"
)

func WriteRunReport(w io.Writer, format OutputFormat, report RunReport) error {
	if IsJSONOutput(format) {
		return WriteJSONEnvelope(w, "run", len(report.OutputErrors) == 0, report.Warnings, report, report.OutputErrors)
	}
	return writeRunReportText(w, report)
}

func writeRunReportText(w io.Writer, report RunReport) error {
	if w == nil {
		return nil
	}
	if err := writeWarnings(w, report.PreambleWarnings); err != nil {
		return err
	}
	if _, err := fmt.Fprintf(w, "Configured pipelines: %d\n", len(report.Pipelines)); err != nil {
		return err
	}
	for _, pipeline := range report.Pipelines {
		if err := writeWarnings(w, pipeline.Warnings); err != nil {
			return err
		}
		if _, err := fmt.Fprintf(w, "- pipeline=%s source=%s bundles=%d destinations=%s\n", pipeline.ID, pipeline.SourceBackend, pipeline.BundleCount, destinationIDSummary(pipeline.Destinations)); err != nil {
			return err
		}
		for _, event := range pipeline.events {
			if event.warning != nil {
				if err := writeWarnings(w, []OutputWarning{*event.warning}); err != nil {
					return err
				}
				continue
			}
			if event.actionIndex < 0 || event.actionIndex >= len(report.Actions) {
				continue
			}
			writeRunActionLine(w, report.Actions[event.actionIndex])
		}
	}
	_, err := fmt.Fprintln(w, report.Summary.Line())
	return err
}

func writeRunActionLine(w io.Writer, action RunActionRecord) {
	if action.Action == "error" {
		destinationID := action.DestinationID
		if destinationID == "" {
			destinationID = "unknown"
		}
		fmt.Fprintf(w, "  - bundle=%s destination=%s backend=%s%s action=error reason=%q\n", action.BundlePath, destinationID, action.Backend, pathMappingRecordSummary(action), action.Reason)
		return
	}
	fmt.Fprintf(w, "  - bundle=%s destination=%s backend=%s%s action=%s%s outputs=%s reason=%q\n", action.BundlePath, action.DestinationID, action.Backend, pathMappingRecordSummary(action), action.Action, workflowRecordSummary(action), outputRecordSummary(action.Outputs), action.Reason)
}

func pathMappingRecordSummary(action RunActionRecord) string {
	if action.PathMapping != config.PathMappingFixed {
		return ""
	}
	return fmt.Sprintf(" path_mapping=fixed target=%s", action.DestinationPath)
}

func workflowRecordSummary(action RunActionRecord) string {
	if action.Workflow == "" {
		return ""
	}
	return fmt.Sprintf(" workflow=%s", action.Workflow)
}

func outputRecordSummary(outputs []RunOutputRecord) string {
	if len(outputs) == 0 {
		return "none"
	}
	paths := make([]string, 0, len(outputs))
	for _, output := range outputs {
		paths = append(paths, output.Path)
	}
	return strings.Join(paths, ",")
}

func destinationIDSummary(ids []string) string {
	if len(ids) == 0 {
		return "none"
	}
	return strings.Join(ids, ",")
}

type RunReport struct {
	DryRun           bool                 `json:"dry_run"`
	Pipelines        []RunPipelineSummary `json:"pipelines"`
	Actions          []RunActionRecord    `json:"actions"`
	Summary          RunSummaryCounters   `json:"summary"`
	Warnings         []OutputWarning      `json:"-"`
	OutputErrors     []OutputError        `json:"-"`
	PreambleWarnings []OutputWarning      `json:"-"`
}

func (r *RunReport) addWarning(warning OutputWarning) {
	r.Warnings = append(r.Warnings, warning)
}

func (r *RunReport) addWarnings(warnings []OutputWarning) {
	r.Warnings = append(r.Warnings, warnings...)
}

type RunPipelineSummary struct {
	ID            string          `json:"id"`
	SourceBackend string          `json:"source_backend"`
	BundleCount   int             `json:"bundle_count"`
	Destinations  []string        `json:"destinations"`
	Warnings      []OutputWarning `json:"-"`
	events        []runPipelineEvent
}

type runPipelineEvent struct {
	warning     *OutputWarning
	actionIndex int
}

func warningEvent(warning OutputWarning) runPipelineEvent {
	return runPipelineEvent{warning: &warning, actionIndex: -1}
}

func actionEvent(actionIndex int) runPipelineEvent {
	return runPipelineEvent{actionIndex: actionIndex}
}

type RunActionRecord struct {
	PipelineID      string            `json:"pipeline_id,omitempty"`
	DestinationID   string            `json:"destination_id"`
	Backend         string            `json:"backend"`
	BundleID        string            `json:"bundle_id,omitempty"`
	BundlePath      string            `json:"bundle_path"`
	DestinationPath string            `json:"destination_path"`
	PathMapping     string            `json:"path_mapping,omitempty"`
	Workflow        string            `json:"workflow,omitempty"`
	Action          string            `json:"action"`
	PrimaryURL      string            `json:"primary_url,omitempty"`
	Reason          string            `json:"reason,omitempty"`
	Outputs         []RunOutputRecord `json:"outputs"`
}

type RunOutputRecord struct {
	Path       string `json:"path"`
	Kind       string `json:"kind"`
	SourcePath string `json:"source_path,omitempty"`
	Transform  string `json:"transform,omitempty"`
	URL        string `json:"url,omitempty"`
	SHA256     string `json:"sha256"`
	Size       int64  `json:"size"`
}

func runActionFromPlan(backend string, plan publish.Plan, planErr error) RunActionRecord {
	if planErr != nil {
		destinationID := plan.DestinationID
		if destinationID == "" {
			destinationID = "unknown"
		}
		action := "error"
		outputs := []RunOutputRecord{}
		switch plan.Action {
		case publish.ActionFailUnmanaged, publish.ActionFailConflict:
			action = string(plan.Action)
			outputs = runOutputsFromPlan(plan.Outputs)
		}
		return RunActionRecord{
			PipelineID:      plan.PipelineID,
			DestinationID:   destinationID,
			Backend:         backend,
			BundleID:        plan.BundleID,
			BundlePath:      storage.DisplayPath(plan.BundlePath),
			DestinationPath: storage.DisplayPath(plan.DestinationBundlePath),
			PathMapping:     plan.PathMapping,
			Workflow:        plan.Workflow,
			Action:          action,
			PrimaryURL:      plan.PrimaryURL,
			Reason:          planErr.Error(),
			Outputs:         outputs,
		}
	}
	return RunActionRecord{
		PipelineID:      plan.PipelineID,
		DestinationID:   plan.DestinationID,
		Backend:         backend,
		BundleID:        plan.BundleID,
		BundlePath:      storage.DisplayPath(plan.BundlePath),
		DestinationPath: storage.DisplayPath(plan.DestinationBundlePath),
		PathMapping:     plan.PathMapping,
		Workflow:        plan.Workflow,
		Action:          string(plan.Action),
		PrimaryURL:      plan.PrimaryURL,
		Reason:          plan.Reason,
		Outputs:         runOutputsFromPlan(plan.Outputs),
	}
}

func errorAction(pipelineID, destinationID, backend, bundlePath string, err error) RunActionRecord {
	return RunActionRecord{
		PipelineID:      pipelineID,
		DestinationID:   destinationID,
		Backend:         backend,
		BundlePath:      storage.DisplayPath(bundlePath),
		DestinationPath: storage.DisplayPath(bundlePath),
		Action:          "error",
		Reason:          err.Error(),
		Outputs:         []RunOutputRecord{},
	}
}

func runOutputsFromPlan(outputs []publish.Output) []RunOutputRecord {
	results := make([]RunOutputRecord, 0, len(outputs))
	for _, output := range outputs {
		stateOutput := output.StateOutputFile()
		results = append(results, RunOutputRecord{
			Path:       stateOutput.Path,
			Kind:       stateOutput.Kind,
			SourcePath: stateOutput.SourcePath,
			Transform:  stateOutput.Transform,
			URL:        stateOutput.URL,
			SHA256:     stateOutput.SHA256,
			Size:       stateOutput.Size,
		})
	}
	return results
}