#![allow(warnings)]
//! TDD Tests for Word Boundary Character-Level Tracking
//!
//! Tests verify that process_tj_array() properly collects character-level data
//! for use by WordBoundaryDetector as a primary (not just tiebreaker) detector.

#[cfg(test)]
mod tests {
    use pdf_oxide::text::word_boundary::{BoundaryContext, CharacterInfo};

    #[test]
    fn test_character_tracking_collects_all_characters() {
        // GIVEN: A TJ array with multiple strings and offsets
        // [(Hello) -200 (World)] TJ
        //
        // WHEN: process_tj_array() is called
        // THEN: All characters should be tracked in character arrays:
        //   - 'H', 'e', 'l', 'l', 'o' (from first string)
        //   - -200 offset marker
        //   - 'W', 'o', 'r', 'l', 'd' (from second string)
        //
        // This test verifies the structure and completeness of character tracking

        // For now, this is a placeholder to establish the test pattern
        // Actual implementation will verify character collection in TextExtractor
        assert!(true);
    }

    #[test]
    fn test_character_info_has_all_required_fields() {
        // GIVEN: A CharacterInfo with all fields filled
        // WHEN: Created during TJ array processing
        // THEN: Should contain:
        //   - code: Unicode code point (u32)
        //   - glyph_id: Optional glyph ID (Option<u16>)
        //   - width: Character width in text space units (f32)
        //   - x_position: Horizontal position (f32)
        //   - tj_offset: Optional TJ offset value (Option<i32>)
        //   - font_size: Current font size in points (f32)

        let char_info = CharacterInfo {
            code: 'H' as u32,
            glyph_id: Some(123),
            width: 500.0,      // Character width in 1/1000 em
            x_position: 100.0, // Current X position
            tj_offset: None,   // No TJ offset for this character
            font_size: 12.0,   // Font size in points
            is_ligature: false,
            original_ligature: None,
            protected_from_split: false,
        };

        assert_eq!(char_info.code, 'H' as u32);
        assert_eq!(char_info.glyph_id, Some(123));
        assert_eq!(char_info.width, 500.0);
        assert_eq!(char_info.x_position, 100.0);
        assert_eq!(char_info.tj_offset, None);
        assert_eq!(char_info.font_size, 12.0);
    }

    #[test]
    fn test_character_info_with_tj_offset() {
        // GIVEN: A CharacterInfo representing a character followed by TJ offset
        // WHEN: Created with tj_offset field populated
        // THEN: Should preserve the offset value for boundary detection

        let char_info = CharacterInfo {
            code: 'o' as u32,
            glyph_id: Some(456),
            width: 400.0,
            x_position: 500.0,
            tj_offset: Some(-200), // Significant negative offset = word boundary
            font_size: 12.0,
            is_ligature: false,
            original_ligature: None,
            protected_from_split: false,
        };

        assert_eq!(char_info.tj_offset, Some(-200));
        assert!(char_info.tj_offset.unwrap() < -100, "Should be beyond threshold");
    }

    #[test]
    fn test_boundary_context_from_extractor_state() {
        // GIVEN: A BoundaryContext with text state parameters
        // WHEN: Created from TextExtractor's graphics state
        // THEN: Should preserve all text state parameters:
        //   - font_size: Tf parameter
        //   - horizontal_scaling: Tz parameter (default 100.0)
        //   - word_spacing: Tw parameter
        //   - char_spacing: Tc parameter

        let context = BoundaryContext {
            font_size: 12.0,
            horizontal_scaling: 100.0,
            word_spacing: 0.0,
            char_spacing: 0.0,
        };

        assert_eq!(context.font_size, 12.0);
        assert_eq!(context.horizontal_scaling, 100.0);
        assert_eq!(context.word_spacing, 0.0);
        assert_eq!(context.char_spacing, 0.0);
    }

    #[test]
    fn test_boundary_context_with_scaling() {
        // GIVEN: A BoundaryContext with non-standard scaling
        // WHEN: Created with horizontal_scaling = 80.0 (condensed text)
        // THEN: Should preserve the scaling value

        let context = BoundaryContext {
            font_size: 12.0,
            horizontal_scaling: 80.0, // Condensed text
            word_spacing: 0.0,
            char_spacing: 0.0,
        };

        assert_eq!(context.horizontal_scaling, 80.0);
    }

    #[test]
    fn test_character_array_maintains_order() {
        // GIVEN: Characters from a TJ array [(Hello)] TJ
        // WHEN: Characters are collected in order
        // THEN: They should be: H(0), e(1), l(2), l(3), o(4)
        //       with indices corresponding to position in array

        let chars = [
            CharacterInfo {
                code: 'H' as u32,
                glyph_id: None,
                width: 500.0,
                x_position: 0.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'e' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 500.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'l' as u32,
                glyph_id: None,
                width: 350.0,
                x_position: 900.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'l' as u32,
                glyph_id: None,
                width: 350.0,
                x_position: 1250.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'o' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 1600.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
        ];

        assert_eq!(chars.len(), 5);
        assert_eq!(chars[0].code, 'H' as u32);
        assert_eq!(chars[4].code, 'o' as u32);
    }

    #[test]
    fn test_tj_offset_tracking_with_word_boundary() {
        // GIVEN: A TJ array [(Hello) -200 (World)] TJ
        // WHEN: Characters are collected with TJ offset
        // THEN: The -200 offset should be associated with the character(s) before it

        let chars = vec![
            CharacterInfo {
                code: 'H' as u32,
                glyph_id: None,
                width: 500.0,
                x_position: 0.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'e' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 500.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'l' as u32,
                glyph_id: None,
                width: 350.0,
                x_position: 900.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'l' as u32,
                glyph_id: None,
                width: 350.0,
                x_position: 1250.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'o' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 1600.0,
                tj_offset: Some(-200),
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            }, // Offset here
            CharacterInfo {
                code: 'W' as u32,
                glyph_id: None,
                width: 500.0,
                x_position: 2100.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
        ];

        // The 'o' at index 4 has the TJ offset
        assert_eq!(chars[4].tj_offset, Some(-200));
        assert!(chars[4].tj_offset.unwrap() < -100);
    }

    #[test]
    fn test_character_positions_increase_left_to_right() {
        // GIVEN: Characters in a left-to-right text flow
        // WHEN: Collected with x_position values
        // THEN: x_position should increase monotonically

        let chars = [
            CharacterInfo {
                code: 'T' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 0.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'e' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 400.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'x' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 800.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 't' as u32,
                glyph_id: None,
                width: 350.0,
                x_position: 1200.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
        ];

        for i in 0..chars.len() - 1 {
            assert!(
                chars[i].x_position < chars[i + 1].x_position,
                "Position should increase: {} < {}",
                chars[i].x_position,
                chars[i + 1].x_position
            );
        }
    }

    #[test]
    fn test_character_width_reflects_glyph_metrics() {
        // GIVEN: Characters with different widths from font metrics
        // WHEN: Collected with width values from font.get_glyph_width()
        // THEN: Width should reflect actual glyph widths (in 1/1000 em)

        let chars = vec![
            CharacterInfo {
                code: 'i' as u32,
                glyph_id: None,
                width: 200.0,
                x_position: 0.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            }, // Narrow
            CharacterInfo {
                code: 'M' as u32,
                glyph_id: None,
                width: 800.0,
                x_position: 200.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            }, // Wide
            CharacterInfo {
                code: 'W' as u32,
                glyph_id: None,
                width: 900.0,
                x_position: 1000.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            }, // Very wide
        ];

        assert_eq!(chars[0].width, 200.0, "Narrow character 'i'");
        assert_eq!(chars[1].width, 800.0, "Wide character 'M'");
        assert_eq!(chars[2].width, 900.0, "Very wide character 'W'");
    }

    #[test]
    fn test_multi_element_tj_array_with_mixed_offsets() {
        // GIVEN: A complex TJ array [(The) -150 (quick) -100 (brown)] TJ
        // WHEN: All elements are processed
        // THEN: Should track all characters and their associated offsets

        let chars = vec![
            // (The)
            CharacterInfo {
                code: 'T' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 0.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'h' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 400.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'e' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 800.0,
                tj_offset: Some(-150),
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            // (quick)
            CharacterInfo {
                code: 'q' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 1250.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'u' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 1650.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'i' as u32,
                glyph_id: None,
                width: 200.0,
                x_position: 2050.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'c' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 2250.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'k' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 2650.0,
                tj_offset: Some(-100),
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            // (brown)
            CharacterInfo {
                code: 'b' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 3050.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'r' as u32,
                glyph_id: None,
                width: 350.0,
                x_position: 3450.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'o' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 3800.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'w' as u32,
                glyph_id: None,
                width: 600.0,
                x_position: 4200.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
            CharacterInfo {
                code: 'n' as u32,
                glyph_id: None,
                width: 400.0,
                x_position: 4800.0,
                tj_offset: None,
                font_size: 12.0,
                is_ligature: false,
                original_ligature: None,
                protected_from_split: false,
            },
        ];

        assert_eq!(chars.len(), 13);
        // Verify offset positions
        assert_eq!(chars[2].tj_offset, Some(-150)); // 'e' in "The"
        assert_eq!(chars[7].tj_offset, Some(-100)); // 'k' in "quick"
    }
}
