// ingestion/internal/pipeline/prompt.go
package pipeline

import (
	"fmt"
	"strings"
	"time"

	"github.com/mathiasbq/hyperguild/ingestion/internal/wiki"
)

const systemPrompt = `You are a wiki agent. Read the source material and produce structured wiki pages following the schema provided.

Output ONLY a valid JSON array — no markdown fences, no other text before or after.
Each element must have:
  "path"    — relative path within the wiki, e.g. "wiki/sources/foo.md"
  "content" — full markdown content of the page including YAML frontmatter

Follow the schema strictly: correct frontmatter fields, wikilinks as [[slug|Display Text]],
dates in YYYY-MM-DD format, and paraphrase rather than quoting verbatim.`

// BuildPrompt constructs the user prompt for a single chunk.
func BuildPrompt(schema, source, content string, inventory map[wiki.PageType][]wiki.Entry) string {
	var sb strings.Builder

	fmt.Fprintf(&sb, "Today's date is %s.\n\n", time.Now().UTC().Format("2006-01-02"))

	sb.WriteString("## Schema\n\n")
	sb.WriteString(schema)
	sb.WriteString("\n\n")

	sb.WriteString("## Existing wiki pages\n\n")
	sb.WriteString("Link ONLY to pages in this inventory or pages you are creating in this response.\n\n")

	for _, pt := range []wiki.PageType{wiki.PageTypeConcept, wiki.PageTypeEntity, wiki.PageTypeSource} {
		entries := inventory[pt]
		label := strings.ToUpper(string(pt)[:1]) + string(pt)[1:]
		if len(entries) == 0 {
			fmt.Fprintf(&sb, "%s — (none yet)\n\n", label)
			continue
		}
		fmt.Fprintf(&sb, "%s — link ONLY under the matching section:\n", label)
		for _, e := range entries {
			fmt.Fprintf(&sb, "  - [[%s|%s]]\n", e.Slug, e.Title)
		}
		sb.WriteString("\n")
	}

	sb.WriteString("## Non-negotiable rules\n\n")
	sb.WriteString("1. Output ONLY a valid JSON array — no prose, no fences.\n")
	sb.WriteString("2. Slugs are kebab-case: lowercase, spaces→hyphens, no special chars.\n")
	sb.WriteString("3. Wikilinks: [[slug|Display Text]] — the pipe is required.\n")
	sb.WriteString("4. Section links must match their section type.\n")
	sb.WriteString("5. One source page per book — update it if inventory shows it exists.\n\n")

	fmt.Fprintf(&sb, "## Source: %s\n\n", source)
	sb.WriteString(content)

	return sb.String()
}