package promptassets_test

import (
	"context"
	"encoding/json"
	"io/fs"
	"strings"
	"testing"

	"gitea.maximumdirect.net/eric/promptkit"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/promptassets"
	"gopkg.in/yaml.v3"
)

type promptDefinition struct {
	ID             string `yaml:"id"`
	Version        string `yaml:"version"`
	DefaultProfile string `yaml:"default_profile"`
	Inputs         []struct {
		Name        string `yaml:"name"`
		Required    bool   `yaml:"required"`
		ContentType string `yaml:"content_type"`
	} `yaml:"inputs"`
	Output struct {
		Format         string `yaml:"format"`
		ValidationMode string `yaml:"validation_mode"`
		SchemaPath     string `yaml:"schema_path"`
		RepairAttempts *int   `yaml:"repair_attempts"`
	} `yaml:"output"`
}

func TestPromptAssetsDeclareTheFourGeneratedTextPrompts(t *testing.T) {
	tests := []struct {
		path     string
		id       string
		schemaID string
	}{
		{"daily/daily_generated_text.yml", "weather.daily_generated_text", "daily"},
		{"today/today_generated_text.yml", "weather.today_generated_text", "today"},
		{"tomorrow/tomorrow_generated_text.yml", "weather.tomorrow_generated_text", "tomorrow"},
		{"hourly/hourly_generated_text.yml", "weather.hourly_generated_text", "hourly"},
	}

	definitions := 0
	if err := fs.WalkDir(promptassets.PromptFS(), ".", func(path string, entry fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if !entry.IsDir() && strings.HasSuffix(path, ".yml") {
			definitions++
		}
		return nil
	}); err != nil {
		t.Fatalf("walk embedded prompts: %v", err)
	}
	if definitions != len(tests) {
		t.Fatalf("prompt definitions = %d, want %d", definitions, len(tests))
	}

	for _, tc := range tests {
		t.Run(tc.id, func(t *testing.T) {
			data, err := fs.ReadFile(promptassets.PromptFS(), tc.path)
			if err != nil {
				t.Fatalf("read prompt definition: %v", err)
			}
			var definition promptDefinition
			if err := yaml.Unmarshal(data, &definition); err != nil {
				t.Fatalf("decode prompt definition: %v", err)
			}
			if definition.ID != tc.id || definition.Version != "1.0.1" || definition.DefaultProfile != "gemini-flash-latest" {
				t.Fatalf("definition = %#v, want %s version 1.0.1 and gemini-flash-latest", definition, tc.id)
			}
			if len(definition.Inputs) != 1 || definition.Inputs[0].Name != "data_package" || !definition.Inputs[0].Required || definition.Inputs[0].ContentType != "application/yaml" {
				t.Fatalf("inputs = %#v, want one required YAML data_package", definition.Inputs)
			}
			if definition.Output.Format != "json" || definition.Output.ValidationMode != "json_schema" || definition.Output.SchemaPath != tc.schemaID+".generated_text.schema.json" || definition.Output.RepairAttempts != nil {
				t.Fatalf("output = %#v, want JSON schema output without repair attempts", definition.Output)
			}
			if _, err := promptassets.Schema(tc.schemaID); err != nil {
				t.Fatalf("Schema(%q) error = %v", tc.schemaID, err)
			}
		})
	}
}

func TestSchemasAreCanonicalAndIndependent(t *testing.T) {
	for _, id := range []string{"daily", "today", "tomorrow", "hourly"} {
		t.Run(id, func(t *testing.T) {
			data, err := promptassets.Schema(id)
			if err != nil {
				t.Fatalf("Schema() error = %v", err)
			}
			var schema struct {
				ID                   string         `json:"$id"`
				Title                string         `json:"title"`
				Type                 string         `json:"type"`
				AdditionalProperties bool           `json:"additionalProperties"`
				Required             []string       `json:"required"`
				Properties           map[string]any `json:"properties"`
			}
			if err := json.Unmarshal(data, &schema); err != nil {
				t.Fatalf("decode schema: %v", err)
			}
			if schema.Type != "object" || schema.AdditionalProperties || strings.Join(schema.Required, ",") != "summary,forecast_discussion,precipitation_timing" {
				t.Fatalf("schema = %#v, want strict generated-text object", schema)
			}
			if _, ok := schema.Properties["confidence"]; ok {
				t.Fatalf("schema properties = %#v, do not want retired confidence field", schema.Properties)
			}
			if id == "daily" && (schema.ID != "weatherreporter.daily.generated_text.schema.json" || schema.Title != "Daily GeneratedText") {
				t.Fatalf("daily schema identity = %q/%q, want corrected Daily identity", schema.ID, schema.Title)
			}
			data[0] = 'x'
			fresh, err := promptassets.Schema(id)
			if err != nil || fresh[0] != '{' {
				t.Fatalf("Schema() returned shared data or error: %v", err)
			}
		})
	}
}

func TestPromptkitInspectsEmbeddedPromptsOffline(t *testing.T) {
	engine, err := promptkit.NewEngine(promptkit.Config{},
		promptkit.WithPromptFS(promptassets.PromptFS(), "."),
		promptkit.WithSchemaFS(promptassets.SchemaFS(), "."),
	)
	if err != nil {
		t.Fatalf("NewEngine() error = %v", err)
	}
	for _, id := range []string{"weather.daily_generated_text", "weather.today_generated_text", "weather.tomorrow_generated_text", "weather.hourly_generated_text"} {
		t.Run(id, func(t *testing.T) {
			inspection, err := engine.InspectPrompt(context.Background(), id, "1.0.1")
			if err != nil {
				t.Fatalf("InspectPrompt() error = %v", err)
			}
			if inspection.PromptID != id || inspection.PromptVersion != "1.0.1" || inspection.DefaultProfileID != "gemini-flash-latest" {
				t.Fatalf("inspection = %#v", inspection)
			}
		})
	}
}

func TestPromptAssetsExcludeRetiredRuntimeSettings(t *testing.T) {
	if err := fs.WalkDir(promptassets.PromptFS(), ".", func(path string, entry fs.DirEntry, err error) error {
		if err != nil || entry.IsDir() {
			return err
		}
		data, err := fs.ReadFile(promptassets.PromptFS(), path)
		if err != nil {
			return err
		}
		for _, unwanted := range []string{"local-heavy", "pipeline-weather/", "application/json", "repair_attempts:", "weather.daily_report"} {
			if strings.Contains(string(data), unwanted) {
				t.Fatalf("%s contains retired runtime setting %q", path, unwanted)
			}
		}
		return nil
	}); err != nil {
		t.Fatalf("walk embedded prompts: %v", err)
	}
}