package config

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestLoadFileValidMinimalLocalToLocalConfig(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: local-copy
    source:
      backend: local
      path: /var/spool/reports
    destinations:
      - id: archive
        backend: local
        path: /srv/archive
`)

	if got, want := len(cfg.Pipelines), 1; got != want {
		t.Fatalf("pipeline count = %d, want %d", got, want)
	}
	destination := cfg.Pipelines[0].Destinations[0]
	if !destination.Publish.Source || destination.Publish.HTML {
		t.Fatalf("publish defaults = source:%t html:%t, want source:true html:false", destination.Publish.Source, destination.Publish.HTML)
	}
	if got, want := cfg.Pipelines[0].Validation.OnDigestMismatch, ValidationActionFail; got != want {
		t.Fatalf("validation default = %q, want %q", got, want)
	}
	if got, want := destination.Transfer.OnDestinationOlder, TransferActionReplace; got != want {
		t.Fatalf("transfer default = %q, want %q", got, want)
	}
	if got, want := destination.Reconciliation.Mode, ReconciliationModeReplace; got != want {
		t.Fatalf("reconciliation mode default = %q, want %q", got, want)
	}
	if got, want := destination.State.Mode, StateModeSingleOwner; got != want {
		t.Fatalf("state mode default = %q, want %q", got, want)
	}
	if got, want := destination.Takeover.Mode, TakeoverModeSamePipeline; got != want {
		t.Fatalf("takeover mode default = %q, want %q", got, want)
	}
	if destination.Retention.Prune.Enabled {
		t.Fatal("retention.prune.enabled default = true, want false")
	}
	if cfg.Secrets.Directory != "" {
		t.Fatalf("secrets.directory = %q, want empty", cfg.Secrets.Directory)
	}
}

func TestLoadFileValidSecretsDirectoryConfig(t *testing.T) {
	cfg := loadConfig(t, `
secrets:
  directory: /run/secrets/distributor
pipelines:
  - id: local-copy
    source:
      backend: local
      path: /var/spool/reports
    destinations:
      - id: archive
        backend: local
        path: /srv/archive
`)

	if got, want := cfg.Secrets.Directory, "/run/secrets/distributor"; got != want {
		t.Fatalf("secrets.directory = %q, want %q", got, want)
	}
}

func TestLoadFileValidFanOutConfig(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: fan-out
    source:
      backend: local
      path: /var/spool/reports
    destinations:
      - id: markdown-archive
        backend: s3
        endpoint: https://s3.example.com
        bucket: reports
        prefix: archive
        publish:
          source: true
          html: false
      - id: static-site
        backend: ssh
        host: example.com
        user: deploy
        port: 22
        path: /srv/www/reports
        publish:
          source: false
          html: true
        transform:
          markdown_to_html:
            enabled: true
            mode: sidecar
`)

	if got, want := len(cfg.Pipelines[0].Destinations), 2; got != want {
		t.Fatalf("destination count = %d, want %d", got, want)
	}
}

func TestLoadFileValidMarkdownIndexConfig(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: static-site
    source:
      backend: local
      path: /var/spool/reports
    destinations:
      - id: web
        backend: local
        path: /srv/www/reports
        publish:
          source: false
          html: true
        transform:
          markdown_to_html:
            enabled: true
            mode: index
            input: report.md
`)

	markdown := cfg.Pipelines[0].Destinations[0].Transform.MarkdownToHTML
	if markdown == nil || markdown.Mode != TransformModeIndex || markdown.Input != "report.md" {
		t.Fatalf("markdown config = %#v, want index input", markdown)
	}
}

func TestLoadFileDefaultsMarkdownModeToSidecar(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: static-site
    source:
      backend: local
      path: /var/spool/reports
    destinations:
      - id: web
        backend: local
        path: /srv/www/reports
        publish:
          source: false
          html: true
        transform:
          markdown_to_html:
            enabled: true
`)

	markdown := cfg.Pipelines[0].Destinations[0].Transform.MarkdownToHTML
	if markdown == nil || markdown.Mode != TransformModeSidecar {
		t.Fatalf("markdown mode = %#v, want sidecar default", markdown)
	}
}

func TestLoadFileDefaultsPathMappingToPreserveRelative(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /destination
`)

	if got, want := cfg.Pipelines[0].Destinations[0].PathMap.Mode, PathMappingPreserveRelative; got != want {
		t.Fatalf("path mapping mode = %q, want %q", got, want)
	}
}

func TestLoadFileAcceptsExplicitReconciliationModes(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
        reconciliation:
          mode: replace
      - id: web
        backend: local
        path: /web
        reconciliation:
          mode: merge
`)

	destinations := cfg.Pipelines[0].Destinations
	if got, want := destinations[0].Reconciliation.Mode, ReconciliationModeReplace; got != want {
		t.Fatalf("archive reconciliation mode = %q, want %q", got, want)
	}
	if got, want := destinations[1].Reconciliation.Mode, ReconciliationModeMerge; got != want {
		t.Fatalf("web reconciliation mode = %q, want %q", got, want)
	}
}

func TestLoadFileAcceptsExplicitStateModes(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
        state:
          mode: single_owner
      - id: web
        backend: local
        path: /web
        state:
          mode: shared_root
`)

	destinations := cfg.Pipelines[0].Destinations
	if got, want := destinations[0].State.Mode, StateModeSingleOwner; got != want {
		t.Fatalf("archive state mode = %q, want %q", got, want)
	}
	if got, want := destinations[1].State.Mode, StateModeSharedRoot; got != want {
		t.Fatalf("web state mode = %q, want %q", got, want)
	}
}

func TestLoadFileAcceptsExplicitTakeoverModes(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: same-pipeline
        backend: local
        path: /same-pipeline
        takeover:
          mode: same_pipeline
      - id: same-source
        backend: local
        path: /same-source
        takeover:
          mode: same_source
      - id: any-managed
        backend: local
        path: /any-managed
        takeover:
          mode: any_managed
      - id: never
        backend: local
        path: /never
        takeover:
          mode: never
`)

	destinations := cfg.Pipelines[0].Destinations
	wants := []string{
		TakeoverModeSamePipeline,
		TakeoverModeSameSource,
		TakeoverModeAnyManaged,
		TakeoverModeNever,
	}
	for index, want := range wants {
		if got := destinations[index].Takeover.Mode; got != want {
			t.Fatalf("destinations[%d].takeover.mode = %q, want %q", index, got, want)
		}
	}
}

func TestLoadFileAcceptsRetentionPruneConfig(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
        retention:
          prune:
            enabled: true
            older_than: 168h
            keep_latest: 3
`)

	prune := cfg.Pipelines[0].Destinations[0].Retention.Prune
	if !prune.Enabled {
		t.Fatal("retention.prune.enabled = false, want true")
	}
	if prune.OlderThan == nil || prune.OlderThan.String() != "168h0m0s" {
		t.Fatalf("retention.prune.older_than = %v, want 168h", prune.OlderThan)
	}
	if prune.KeepLatest == nil || *prune.KeepLatest != 3 {
		t.Fatalf("retention.prune.keep_latest = %v, want 3", prune.KeepLatest)
	}
}

func TestLoadFileAcceptsFixedPathMapping(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: latest
        backend: local
        path: /destination/latest
        path_mapping:
          mode: fixed
`)

	if got, want := cfg.Pipelines[0].Destinations[0].PathMap.Mode, PathMappingFixed; got != want {
		t.Fatalf("path mapping mode = %q, want %q", got, want)
	}
}

func TestLoadFileDefaultsLinksPrimaryToAuto(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: web
        backend: local
        path: /destination
        links:
          base_url: https://reports.example.com/archive
`)

	links := cfg.Pipelines[0].Destinations[0].Links
	if links == nil {
		t.Fatal("links = nil, want config")
	}
	if links.BaseURL != "https://reports.example.com/archive" || links.Primary != LinkPrimaryAuto {
		t.Fatalf("links = %#v, want base URL with auto primary", links)
	}
}

func TestLoadFileDefaultsHTTPServerConfig(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
`)

	server := cfg.Server.HTTP
	if got, want := server.Bind, DefaultHTTPBind; got != want {
		t.Fatalf("server.http.bind = %q, want %q", got, want)
	}
	if got, want := server.StagingRoot, DefaultHTTPStagingRoot; got != want {
		t.Fatalf("server.http.staging_root = %q, want %q", got, want)
	}
	if got, want := *server.MaxUploadSize, DefaultHTTPMaxUploadSize; got != want {
		t.Fatalf("server.http.max_upload_size = %s, want %s", got, want)
	}
	if got, want := server.QueueSize, DefaultHTTPQueueSize; got != want {
		t.Fatalf("server.http.queue_size = %d, want %d", got, want)
	}
	if got, want := server.MaxConcurrency, DefaultHTTPMaxConcurrency; got != want {
		t.Fatalf("server.http.max_concurrency = %d, want %d", got, want)
	}
	if got, want := *server.Retention, DefaultHTTPRetention; got != want {
		t.Fatalf("server.http.retention = %s, want %s", got, want)
	}
}

func TestLoadFileAcceptsHTTPUploadSourceConfig(t *testing.T) {
	cfg := loadConfig(t, `
server:
  http:
    bind: 127.0.0.1:9090
    staging_root: /srv/distributor/staging
    max_upload_size: 64MB
    queue_size: 32
    max_concurrency: 2
    retention: 48h
pipelines:
  - id: weather-daily
    source:
      backend: http_upload
      staging_path: /srv/distributor/staging/weather-daily
      max_upload_size: 32MB
    destinations:
      - id: archive
        backend: local
        path: /archive
upload_tokens:
  - id: weather-reporter
    token_env: WEATHER_DAILY_UPLOAD_TOKEN
    allow_pipelines:
      - weather-daily
`)

	server := cfg.Server.HTTP
	if got, want := server.Bind, "127.0.0.1:9090"; got != want {
		t.Fatalf("server.http.bind = %q, want %q", got, want)
	}
	if got, want := server.StagingRoot, "/srv/distributor/staging"; got != want {
		t.Fatalf("server.http.staging_root = %q, want %q", got, want)
	}
	if got, want := *server.MaxUploadSize, ByteSize(64*1024*1024); got != want {
		t.Fatalf("server.http.max_upload_size = %s, want %s", got, want)
	}
	if got, want := server.QueueSize, 32; got != want {
		t.Fatalf("server.http.queue_size = %d, want %d", got, want)
	}
	if got, want := server.MaxConcurrency, 2; got != want {
		t.Fatalf("server.http.max_concurrency = %d, want %d", got, want)
	}
	if got, want := server.Retention.String(), "48h0m0s"; got != want {
		t.Fatalf("server.http.retention = %s, want %s", got, want)
	}

	source := cfg.Pipelines[0].Source
	if got, want := source.Backend, BackendHTTPUpload; got != want {
		t.Fatalf("source.backend = %q, want %q", got, want)
	}
	if got, want := source.Upload.StagingPath, "/srv/distributor/staging/weather-daily"; got != want {
		t.Fatalf("source.staging_path = %q, want %q", got, want)
	}
	if got, want := *source.Upload.MaxUploadSize, ByteSize(32*1024*1024); got != want {
		t.Fatalf("source.max_upload_size = %s, want %s", got, want)
	}
}

func TestLoadFileDefaultsHTTPUploadSourceConfig(t *testing.T) {
	cfg := loadConfig(t, `
server:
  http:
    max_upload_size: 12MB
pipelines:
  - id: weather-daily
    source:
      backend: http_upload
    destinations:
      - id: archive
        backend: local
        path: /archive
upload_tokens:
  - id: weather-reporter
    token_env: WEATHER_DAILY_UPLOAD_TOKEN
    allow_pipelines:
      - weather-daily
`)

	source := cfg.Pipelines[0].Source
	if got, want := source.Upload.StagingPath, "/var/spool/distributor/weather-daily"; got != want {
		t.Fatalf("source.staging_path = %q, want %q", got, want)
	}
	if got, want := *source.Upload.MaxUploadSize, ByteSize(12*1024*1024); got != want {
		t.Fatalf("source.max_upload_size = %s, want %s", got, want)
	}
}

func TestLoadFileAcceptsHTTPUploadTokens(t *testing.T) {
	tests := map[string]string{
		"valid multi pipeline token": `
pipelines:
  - id: weather-daily
    source:
      backend: http_upload
    destinations:
      - id: archive
        backend: local
        path: /archive/weather
  - id: calendar-daily
    source:
      backend: http_upload
    destinations:
      - id: archive
        backend: local
        path: /archive/calendar
upload_tokens:
  - id: reporter
    token_env: REPORTER_UPLOAD_TOKEN
    allow_pipelines:
      - weather-daily
      - calendar-daily
`,
		"multiple tokens for one pipeline": `
pipelines:
  - id: reports
    source:
      backend: http_upload
    destinations:
      - id: archive
        backend: local
        path: /archive
upload_tokens:
  - id: reporter-a
    token_env: REPORTER_A_UPLOAD_TOKEN
    allow_pipelines:
      - reports
  - id: reporter-b
    token_env: REPORTER_B_UPLOAD_TOKEN
    allow_pipelines:
      - reports
`,
	}
	for name, body := range tests {
		t.Run(name, func(t *testing.T) {
			loadConfig(t, body)
		})
	}
}

func TestLoadFileRejectsInvalidUploadTokens(t *testing.T) {
	tests := map[string]struct {
		body string
		want string
	}{
		"missing token list": {
			body: `pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
			want: "upload_tokens is required",
		},
		"duplicate token ids": {
			body: `upload_tokens: [{id: reporter, token_env: ONE_UPLOAD_TOKEN, allow_pipelines: [reports]}, {id: reporter, token_env: TWO_UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
			want: "upload token id reporter is duplicated",
		},
		"duplicate allowlist entries": {
			body: `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN, allow_pipelines: [reports, reports]}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
			want: "allow_pipelines contains duplicate pipeline id reports",
		},
		"unknown allowed pipeline id": {
			body: `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN, allow_pipelines: [missing]}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
			want: "references unknown pipeline missing",
		},
		"non upload allowed pipeline id": {
			body: `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}, {id: uploader, token_env: OTHER_UPLOAD_TOKEN, allow_pipelines: [upload]}]
pipelines: [{id: reports, source: {backend: local, path: /source}, destinations: [{id: archive, backend: local, path: /archive}]}, {id: upload, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive-upload}]}]`,
			want: "references non-http_upload pipeline reports",
		},
		"upload pipeline not allowed": {
			body: `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}, {id: other, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive-other}]}]`,
			want: "http_upload pipeline other is not allowed by any upload token",
		},
		"missing token id": {
			body: `upload_tokens: [{token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
			want: "upload_tokens[0].id is required",
		},
		"invalid token id": {
			body: `upload_tokens: [{id: ".reporter", token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
			want: "upload_tokens[0].id must be a slug-like identifier",
		},
		"missing token env": {
			body: `upload_tokens: [{id: reporter, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
			want: "upload_tokens[0].token_env is required",
		},
		"missing allowlist": {
			body: `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
			want: "upload_tokens[0].allow_pipelines is required",
		},
	}
	for name, tt := range tests {
		t.Run(name, func(t *testing.T) {
			assertLoadError(t, tt.body, tt.want)
		})
	}
}

func TestLoadFileValidBackendConfigs(t *testing.T) {
	tests := map[string]string{
		"local": `
pipelines:
  - id: local-backend
    source:
      backend: local
      path: /source
    destinations:
      - id: local-destination
        backend: local
        path: /destination
`,
		"ssh": `
pipelines:
  - id: ssh-backend
    source:
      backend: ssh
      host: source.example.com
      user: reports
      path: /source
    destinations:
      - id: ssh-destination
        backend: ssh
        host: destination.example.com
        user: deploy
        port: 2222
        path: /destination
        ssh_key_file: /home/deploy/.ssh/id_ed25519
        known_hosts: /home/deploy/.ssh/known_hosts
        host_key_policy: strict
`,
		"s3": `
pipelines:
  - id: s3-backend
    source:
      backend: s3
      endpoint: https://s3.example.com
      bucket: source
      prefix: incoming
      region: us-east-1
      force_path_style: true
      credentials:
        access_key_id_env: DISTRIBUTOR_S3_ACCESS_KEY_ID
        secret_access_key_env: DISTRIBUTOR_S3_SECRET_ACCESS_KEY
    destinations:
      - id: s3-destination
        backend: s3
        endpoint: https://s3.example.com
        bucket: destination
        prefix: archive
`,
	}

	for name, body := range tests {
		t.Run(name, func(t *testing.T) {
			loadConfig(t, body)
		})
	}
}

func TestLoadFileDefaultsS3Config(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: s3-defaults
    source:
      backend: s3
      endpoint: http://127.0.0.1:9000
      bucket: source
      prefix: /incoming/reports/
    destinations:
      - id: archive
        backend: s3
        endpoint: http://127.0.0.1:9000
        bucket: destination
`)

	source := cfg.Pipelines[0].Source
	if got, want := source.Region, DefaultS3Region; got != want {
		t.Fatalf("source region = %q, want %q", got, want)
	}
	if got, want := source.Prefix, "incoming/reports"; got != want {
		t.Fatalf("source prefix = %q, want %q", got, want)
	}
	if !ForcePathStyle(source.ForcePath) {
		t.Fatal("source force_path_style = false, want true")
	}
	destination := cfg.Pipelines[0].Destinations[0]
	if got, want := destination.Region, DefaultS3Region; got != want {
		t.Fatalf("destination region = %q, want %q", got, want)
	}
	if !ForcePathStyle(destination.ForcePath) {
		t.Fatal("destination force_path_style = false, want true")
	}
}

func TestLoadFilePreservesExplicitS3ForcePathStyleFalse(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: s3-force-path
    source:
      backend: s3
      endpoint: https://s3.example.com
      bucket: source
      force_path_style: false
    destinations:
      - id: archive
        backend: local
        path: /archive
`)

	if ForcePathStyle(cfg.Pipelines[0].Source.ForcePath) {
		t.Fatal("force_path_style = true, want explicit false")
	}
}

func TestLoadFileRejectsDuplicatePipelineIDs(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: duplicate
    source:
      backend: local
      path: /one
    destinations:
      - id: archive
        backend: local
        path: /archive
  - id: duplicate
    source:
      backend: local
      path: /two
    destinations:
      - id: archive
        backend: local
        path: /archive
`, "pipeline id duplicate is duplicated")
}

func TestLoadFileRejectsDuplicateDestinationIDs(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive-one
      - id: archive
        backend: local
        path: /archive-two
`, "destination id archive is duplicated")
}

func TestLoadFileRejectsMissingRequiredFields(t *testing.T) {
	tests := map[string]string{
		"pipelines":       ``,
		"pipeline id":     `pipelines: [{source: {backend: local, path: /source}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"source backend":  `pipelines: [{id: reports, source: {path: /source}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"destinations":    `pipelines: [{id: reports, source: {backend: local, path: /source}}]`,
		"destination id":  `pipelines: [{id: reports, source: {backend: local, path: /source}, destinations: [{backend: local, path: /archive}]}]`,
		"local path":      `pipelines: [{id: reports, source: {backend: local}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"ssh host":        `pipelines: [{id: reports, source: {backend: ssh, path: /source}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"s3 bucket":       `pipelines: [{id: reports, source: {backend: s3, endpoint: "https://s3.example.com"}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"publish outputs": `pipelines: [{id: reports, source: {backend: local, path: /source}, destinations: [{id: archive, backend: local, path: /archive, publish: {source: false, html: false}}]}]`,
	}

	for name, body := range tests {
		t.Run(name, func(t *testing.T) {
			assertLoadError(t, body, "")
		})
	}
}

func TestLoadFileRejectsInvalidS3Config(t *testing.T) {
	tests := map[string]string{
		"prefix traversal": `pipelines: [{id: reports, source: {backend: s3, endpoint: "https://s3.example.com", bucket: source, prefix: "../reports"}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"prefix backslash": `pipelines: [{id: reports, source: {backend: s3, endpoint: "https://s3.example.com", bucket: source, prefix: 'a\b'}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"partial creds":    `pipelines: [{id: reports, source: {backend: s3, endpoint: "https://s3.example.com", bucket: source, credentials: {access_key_id_env: ACCESS_KEY_ID}}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
	}
	for name, body := range tests {
		t.Run(name, func(t *testing.T) {
			assertLoadError(t, body, "")
		})
	}
}

func TestLoadFileRejectsInvalidHTTPUploadConfig(t *testing.T) {
	tests := map[string]string{
		"server size": `server: {http: {max_upload_size: 20XB}}`,
		"source size": `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload, max_upload_size: 20XB}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"zero source size": `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload, max_upload_size: 0B}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"server duration":         `server: {http: {retention: forever}}`,
		"zero server duration":    `server: {http: {retention: 0s}}`,
		"prune duration":          `pipelines: [{id: reports, source: {backend: local, path: /source}, destinations: [{id: archive, backend: local, path: /archive, retention: {prune: {enabled: true, older_than: forever}}}]}]`,
		"missing upload tokens":   `pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"destination http upload": `pipelines: [{id: reports, source: {backend: local, path: /source}, destinations: [{id: ingest, backend: http_upload}]}]`,
		"literal token": `upload_tokens: [{id: reporter, token: secret, token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"unknown server field": `server: {http: {surprise: true}}`,
		"legacy source token env": `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload, token_env: UPLOAD_TOKEN}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
		"unknown source field": `upload_tokens: [{id: reporter, token_env: UPLOAD_TOKEN, allow_pipelines: [reports]}]
pipelines: [{id: reports, source: {backend: http_upload, surprise: true}, destinations: [{id: archive, backend: local, path: /archive}]}]`,
	}
	for name, body := range tests {
		t.Run(name, func(t *testing.T) {
			assertLoadError(t, body, "")
		})
	}
}

func TestLoadFileDefaultsSSHConfig(t *testing.T) {
	cfg := loadConfig(t, `
pipelines:
  - id: ssh-defaults
    source:
      backend: ssh
      host: source.example.com
      path: /source
    destinations:
      - id: archive
        backend: ssh
        host: destination.example.com
        path: /archive
        host_key_policy: false
`)

	source := cfg.Pipelines[0].Source
	if source.Port != 22 {
		t.Fatalf("source port = %d, want 22", source.Port)
	}
	if source.SSH.HostKeyPolicy != HostKeyPolicyAcceptNew {
		t.Fatalf("source host key policy = %q, want accept-new", source.SSH.HostKeyPolicy)
	}
	destination := cfg.Pipelines[0].Destinations[0]
	if destination.Port != 22 {
		t.Fatalf("destination port = %d, want 22", destination.Port)
	}
	if destination.SSH.HostKeyPolicy != HostKeyPolicyOff {
		t.Fatalf("destination host key policy = %q, want off", destination.SSH.HostKeyPolicy)
	}
}

func TestLoadFileNormalizesSSHHostKeyPolicies(t *testing.T) {
	tests := map[string]HostKeyPolicy{
		`true`:         HostKeyPolicyStrict,
		`"true"`:       HostKeyPolicyStrict,
		`strict`:       HostKeyPolicyStrict,
		`accept-new`:   HostKeyPolicyAcceptNew,
		`false`:        HostKeyPolicyOff,
		`"false"`:      HostKeyPolicyOff,
		`off`:          HostKeyPolicyOff,
		`"STRICT"`:     HostKeyPolicyStrict,
		`"ACCEPT-NEW"`: HostKeyPolicyAcceptNew,
		`"OFF"`:        HostKeyPolicyOff,
	}
	for value, want := range tests {
		t.Run(value, func(t *testing.T) {
			cfg := loadConfig(t, `
pipelines:
  - id: ssh-policy
    source:
      backend: ssh
      host: source.example.com
      path: /source
      host_key_policy: `+value+`
    destinations:
      - id: archive
        backend: local
        path: /archive
`)
			if got := cfg.Pipelines[0].Source.SSH.HostKeyPolicy; got != want {
				t.Fatalf("host key policy = %q, want %q", got, want)
			}
		})
	}
}

func TestLoadFileRejectsLegacySSHURIFieldAsUnknown(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    source:
      backend: ssh
      uri: ssh://reports@example.com:22
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
`, "field uri not found")
}

func TestLoadFileRejectsUnsupportedBackend(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    source:
      backend: ftp
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
`, "backend ftp is unsupported")
}

func TestLoadFileRejectsInvalidTransferAction(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
        transfer:
          on_destination_older: overwrite
`, "on_destination_older must be replace or fail")
}

func TestLoadFileRejectsInvalidTakeoverMode(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
        takeover:
          mode: unmanaged
`, "takeover.mode must be same_pipeline, same_source, any_managed, or never")
}

func TestLoadFileRejectsUnknownTakeoverFields(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
        takeover:
          surprise: true
`, "field surprise not found")
}

func TestLoadFileRejectsInvalidValidationAction(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    validation:
      on_digest_mismatch: warn
    destinations:
      - id: archive
        backend: local
        path: /archive
`, "on_digest_mismatch must be fail")
}

func TestLoadFileRejectsHTMLPublishWithoutTransform(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: static
        backend: local
        path: /srv/www
        publish:
          source: false
          html: true
`, "markdown_to_html is required")
}

func TestLoadFileRejectsUnknownFields(t *testing.T) {
	assertLoadError(t, `
pipelines:
  - id: reports
    surprise: true
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
`, "field surprise not found")
}

func TestLoadFileRejectsUnknownSecretsFields(t *testing.T) {
	assertLoadError(t, `
secrets:
  directory: /run/secrets/distributor
  surprise: true
pipelines:
  - id: reports
    source:
      backend: local
      path: /source
    destinations:
      - id: archive
        backend: local
        path: /archive
`, "field surprise not found")
}

func TestExampleConfigsLoad(t *testing.T) {
	for _, path := range []string{
		"../../examples/local-to-local.yml",
		"../../examples/local-publish.yml",
		"../../examples/local-html.yml",
		"../../examples/local-index.yml",
		"../../examples/fan-out.yml",
		"../../examples/archive-and-latest.yml",
		"../../examples/merge-reconciliation.yml",
		"../../examples/shared-root.yml",
		"../../examples/http-upload-local.yml",
		"../../examples/ssh-destination.yml",
		"../../examples/s3-destination.yml",
	} {
		t.Run(path, func(t *testing.T) {
			if _, err := LoadFile(path); err != nil {
				t.Fatalf("LoadFile(%q) error = %v", path, err)
			}
		})
	}
}

func loadConfig(t *testing.T, body string) Config {
	t.Helper()
	path := writeConfig(t, body)
	cfg, err := LoadFile(path)
	if err != nil {
		t.Fatalf("LoadFile() error = %v", err)
	}
	return cfg
}

func assertLoadError(t *testing.T, body, want string) {
	t.Helper()
	path := writeConfig(t, body)
	_, err := LoadFile(path)
	if err == nil {
		t.Fatal("LoadFile() error = nil, want error")
	}
	if want != "" && !strings.Contains(err.Error(), want) {
		t.Fatalf("LoadFile() error = %q, want substring %q", err.Error(), want)
	}
}

func writeConfig(t *testing.T, body string) string {
	t.Helper()
	path := filepath.Join(t.TempDir(), "config.yml")
	if err := os.WriteFile(path, []byte(strings.TrimSpace(body)+"\n"), 0o600); err != nil {
		t.Fatalf("write config: %v", err)
	}
	return path
}